| 1 | ! ===================================== |
| 2 | ! AST Executor Module - Execute parsed command trees |
| 3 | ! ===================================== |
| 4 | ! Executes commands from the AST produced by the grammar parser |
| 5 | ! Part of the parser rewrite project |
| 6 | ! |
| 7 | ! Status: PHASE 4 - AST execution implementation |
| 8 | ! Author: Parser Rewrite Team |
| 9 | ! Created: 2025-11-06 |
| 10 | |
| 11 | module ast_executor |
| 12 | use iso_fortran_env |
| 13 | use iso_c_binding |
| 14 | use shell_types |
| 15 | use command_tree |
| 16 | use system_interface |
| 17 | use job_control |
| 18 | use glob, only: pattern_matches_no_dotfile_check |
| 19 | use shell_options, only: check_errexit, trace_command |
| 20 | use io_helpers, only: write_stderr |
| 21 | implicit none |
| 22 | private |
| 23 | |
| 24 | ! Public interface |
| 25 | public :: execute_ast |
| 26 | public :: execute_ast_node |
| 27 | public :: unset_ast_function |
| 28 | public :: is_ast_function |
| 29 | public :: execute_external_command ! Currently unused but may be needed later |
| 30 | public :: register_trap_evaluator |
| 31 | |
| 32 | ! C bindings for process control |
| 33 | interface |
| 34 | function close(fd) bind(c, name='close') |
| 35 | import :: c_int |
| 36 | integer(c_int), value :: fd |
| 37 | integer(c_int) :: close |
| 38 | end function close |
| 39 | end interface |
| 40 | |
| 41 | ! Global function AST cache (maps function name to AST body) |
| 42 | type :: function_ast_entry_t |
| 43 | character(len=256) :: name |
| 44 | type(command_node_t), pointer :: body => null() |
| 45 | end type function_ast_entry_t |
| 46 | |
| 47 | type(function_ast_entry_t), save :: function_ast_cache(MAX_FUNCTIONS) |
| 48 | integer, save :: num_cached_functions = 0 |
| 49 | |
| 50 | contains |
| 51 | |
| 52 | ! ===================================== |
| 53 | ! Main Entry Point |
| 54 | ! ===================================== |
| 55 | |
| 56 | ! Execute an AST and return exit status |
| 57 | function execute_ast(root, shell) result(exit_status) |
| 58 | type(command_node_t), pointer, intent(in) :: root |
| 59 | type(shell_state_t), intent(inout) :: shell |
| 60 | integer :: exit_status |
| 61 | |
| 62 | if (.not. associated(root)) then |
| 63 | exit_status = 0 |
| 64 | return |
| 65 | end if |
| 66 | |
| 67 | exit_status = execute_ast_node(root, shell) |
| 68 | end function execute_ast |
| 69 | |
| 70 | ! Register the AST evaluator with trap_dispatch (breaks circular dep with executor) |
| 71 | subroutine register_trap_evaluator() |
| 72 | use trap_dispatch, only: set_trap_evaluator |
| 73 | call set_trap_evaluator(ast_eval_string) |
| 74 | end subroutine register_trap_evaluator |
| 75 | |
| 76 | ! Wrapper matching trap_dispatch interface: parse string and execute via AST |
| 77 | subroutine ast_eval_string(cmd_string, shell, exit_code) |
| 78 | use grammar_parser, only: parse_command_line |
| 79 | character(len=*), intent(in) :: cmd_string |
| 80 | type(shell_state_t), intent(inout) :: shell |
| 81 | integer, intent(out) :: exit_code |
| 82 | type(command_node_t), pointer :: ast_root |
| 83 | |
| 84 | exit_code = 0 |
| 85 | ast_root => parse_command_line(cmd_string) |
| 86 | if (associated(ast_root)) then |
| 87 | exit_code = execute_ast(ast_root, shell) |
| 88 | end if |
| 89 | end subroutine ast_eval_string |
| 90 | |
| 91 | ! ===================================== |
| 92 | ! Node Execution Functions |
| 93 | ! ===================================== |
| 94 | |
| 95 | recursive function execute_ast_node(node, shell) result(exit_status) |
| 96 | type(command_node_t), pointer, intent(in) :: node |
| 97 | type(shell_state_t), intent(inout) :: shell |
| 98 | integer :: exit_status |
| 99 | |
| 100 | if (.not. associated(node)) then |
| 101 | exit_status = 0 |
| 102 | return |
| 103 | end if |
| 104 | |
| 105 | ! Update LINENO to reflect current line being executed |
| 106 | if (node%line > 0) then |
| 107 | shell%current_line_number = node%line |
| 108 | end if |
| 109 | |
| 110 | select case(node%node_type) |
| 111 | case(CMD_SIMPLE) |
| 112 | exit_status = execute_simple_command(node, shell) |
| 113 | case(CMD_PIPELINE) |
| 114 | exit_status = execute_pipeline_node(node, shell) |
| 115 | case(CMD_LIST) |
| 116 | exit_status = execute_list_node(node, shell) |
| 117 | case(CMD_IF_STATEMENT) |
| 118 | exit_status = execute_if_node(node, shell) |
| 119 | case(CMD_WHILE_LOOP, CMD_UNTIL_LOOP) |
| 120 | exit_status = execute_while_node(node, shell) |
| 121 | case(CMD_FOR_LOOP) |
| 122 | exit_status = execute_for_node(node, shell) |
| 123 | case(CMD_CASE_STATEMENT) |
| 124 | exit_status = execute_case_node(node, shell) |
| 125 | case(CMD_SUBSHELL) |
| 126 | exit_status = execute_subshell_node(node, shell) |
| 127 | case(CMD_BRACE_GROUP) |
| 128 | exit_status = execute_brace_group_node(node, shell) |
| 129 | case(CMD_FUNCTION_DEF) |
| 130 | ! Function definitions: Store in shell state |
| 131 | exit_status = execute_function_def(node, shell) |
| 132 | case(CMD_FOR_ARITH) |
| 133 | exit_status = execute_for_arith_node(node, shell) |
| 134 | case(CMD_COPROC) |
| 135 | exit_status = execute_coproc_node(node, shell) |
| 136 | case default |
| 137 | ! node_type = 0 usually means uninitialized/invalid AST node from parser |
| 138 | if (node%node_type == 0) then |
| 139 | call write_stderr('sh: -c: line 1: syntax error: unexpected end of file') |
| 140 | else |
| 141 | block |
| 142 | character(len=32) :: nt_str |
| 143 | write(nt_str, '(i0)') node%node_type |
| 144 | call write_stderr('fortsh: unknown node type: ' // trim(nt_str)) |
| 145 | end block |
| 146 | end if |
| 147 | exit_status = 1 |
| 148 | end select |
| 149 | |
| 150 | shell%last_exit_status = exit_status |
| 151 | end function execute_ast_node |
| 152 | |
| 153 | ! ===================================== |
| 154 | ! Simple Command Execution |
| 155 | ! ===================================== |
| 156 | |
| 157 | function execute_simple_command(node, shell) result(exit_status) |
| 158 | use executor, only: execute_pipeline |
| 159 | use fd_redirection, only: apply_single_redirection, & |
| 160 | save_fd_mark, restore_fds_to_mark |
| 161 | use parser, only: expand_variables |
| 162 | use iso_fortran_env, only: error_unit |
| 163 | type(command_node_t), pointer, intent(in) :: node |
| 164 | type(shell_state_t), intent(inout) :: shell |
| 165 | integer :: exit_status |
| 166 | integer :: i, func_idx, old_num_positional, eq_pos, fd_mark |
| 167 | type(pipeline_t) :: temp_pipeline |
| 168 | type(redirection_t) :: temp_redirect |
| 169 | character(len=256) :: cmd_name ! Command names are short; was MAX_TOKEN_LEN (4096) |
| 170 | type(string_t), allocatable :: old_params(:) |
| 171 | character(len=:), allocatable :: expanded_filename |
| 172 | logical :: redir_success |
| 173 | logical :: has_redirects, is_pure_assignment |
| 174 | |
| 175 | exit_status = 0 |
| 176 | |
| 177 | if (.not. associated(node%simple_cmd)) then |
| 178 | exit_status = 0 |
| 179 | return |
| 180 | end if |
| 181 | |
| 182 | ! Check for empty command (e.g., from empty command substitution result like $(true)) |
| 183 | ! When a command substitution returns empty and is the only word, we have num_words=1 |
| 184 | ! but the word itself is empty |
| 185 | if (node%simple_cmd%num_words > 0 .and. allocated(node%simple_cmd%words)) then |
| 186 | block |
| 187 | logical :: is_empty_cmd |
| 188 | integer :: check_i, check_len |
| 189 | |
| 190 | ! Check if first word is empty (accounting for sentinel characters) |
| 191 | is_empty_cmd = .false. |
| 192 | check_len = len_trim(node%simple_cmd%words(1)) |
| 193 | if (check_len == 0) then |
| 194 | is_empty_cmd = .true. |
| 195 | else |
| 196 | ! Check if word contains only sentinel characters (char(2), char(3)) |
| 197 | is_empty_cmd = .true. |
| 198 | do check_i = 1, check_len |
| 199 | if (node%simple_cmd%words(1)(check_i:check_i) /= char(2) .and. & |
| 200 | node%simple_cmd%words(1)(check_i:check_i) /= char(3)) then |
| 201 | is_empty_cmd = .false. |
| 202 | exit |
| 203 | end if |
| 204 | end do |
| 205 | end if |
| 206 | |
| 207 | if (is_empty_cmd) then |
| 208 | ! Empty first word - check if it was a quoted literal empty string |
| 209 | ! If so, it's an explicit empty command name which is "command not found" |
| 210 | ! If not quoted (came from expansion), just preserve exit status |
| 211 | if (allocated(node%simple_cmd%word_was_quoted)) then |
| 212 | if (node%simple_cmd%word_was_quoted(1)) then |
| 213 | ! Explicit empty string like '' or "" - command not found |
| 214 | ! Apply any redirections first (e.g., 2>/dev/null) |
| 215 | if (node%simple_cmd%num_redirects > 0) then |
| 216 | fd_mark = save_fd_mark() |
| 217 | block |
| 218 | use fd_redirection, only: apply_single_redirection |
| 219 | use parser, only: expand_variables |
| 220 | type(redirection_t) :: temp_redirect |
| 221 | logical :: redir_success |
| 222 | character(len=:), allocatable :: expanded_filename |
| 223 | integer :: redir_idx |
| 224 | |
| 225 | do redir_idx = 1, node%simple_cmd%num_redirects |
| 226 | temp_redirect%type = node%simple_cmd%redirects(redir_idx)%type |
| 227 | temp_redirect%fd = node%simple_cmd%redirects(redir_idx)%fd |
| 228 | temp_redirect%target_fd = node%simple_cmd%redirects(redir_idx)%target_fd |
| 229 | if (allocated(node%simple_cmd%redirects(redir_idx)%filename)) then |
| 230 | call expand_variables(trim(node%simple_cmd%redirects(redir_idx)%filename), expanded_filename, shell) |
| 231 | if (allocated(expanded_filename)) then |
| 232 | temp_redirect%filename = expanded_filename |
| 233 | else |
| 234 | temp_redirect%filename = trim(node%simple_cmd%redirects(redir_idx)%filename) |
| 235 | end if |
| 236 | else |
| 237 | temp_redirect%filename = '' |
| 238 | end if |
| 239 | temp_redirect%force_clobber = node%simple_cmd%redirects(redir_idx)%force_clobber |
| 240 | call apply_single_redirection(temp_redirect, redir_success, shell%option_noclobber) |
| 241 | end do |
| 242 | end block |
| 243 | end if |
| 244 | call write_stderr('fortsh: : command not found') |
| 245 | ! Restore file descriptors |
| 246 | if (node%simple_cmd%num_redirects > 0) then |
| 247 | call restore_fds_to_mark(fd_mark) |
| 248 | end if |
| 249 | exit_status = 127 |
| 250 | shell%last_exit_status = exit_status |
| 251 | return |
| 252 | end if |
| 253 | end if |
| 254 | ! Empty from expansion - preserve exit status and return |
| 255 | exit_status = shell%last_exit_status |
| 256 | return |
| 257 | end if |
| 258 | end block |
| 259 | end if |
| 260 | |
| 261 | if (node%simple_cmd%num_words == 0) then |
| 262 | ! Handle pure assignments (no command, just VAR=value) |
| 263 | if (node%simple_cmd%num_assignments > 0) then |
| 264 | ! Process assignments as shell variable settings |
| 265 | block |
| 266 | use variables, only: set_shell_variable |
| 267 | use parser, only: expand_variables |
| 268 | integer :: assign_idx, assign_eq_pos, value_len, token_len, saved_status |
| 269 | character(len=256) :: assign_name |
| 270 | character(len=:), allocatable :: assign_value, expanded_value |
| 271 | |
| 272 | ! Save the exit status before assignment expansion |
| 273 | ! POSIX: Pure assignment exit status should be 0 unless command substitution fails |
| 274 | saved_status = shell%last_exit_status |
| 275 | shell%last_exit_status = 0 |
| 276 | |
| 277 | do assign_idx = 1, node%simple_cmd%num_assignments |
| 278 | ! Use tracked length to preserve trailing whitespace |
| 279 | if (allocated(node%simple_cmd%assignment_lengths) .and. & |
| 280 | assign_idx <= size(node%simple_cmd%assignment_lengths)) then |
| 281 | token_len = node%simple_cmd%assignment_lengths(assign_idx) |
| 282 | else |
| 283 | token_len = len_trim(node%simple_cmd%assignments(assign_idx)) |
| 284 | end if |
| 285 | assign_eq_pos = index(node%simple_cmd%assignments(assign_idx), '=') |
| 286 | if (assign_eq_pos > 1) then |
| 287 | assign_name = node%simple_cmd%assignments(assign_idx)(1:assign_eq_pos-1) |
| 288 | block |
| 289 | use variables, only: safe_assign_alloc_str |
| 290 | integer :: av_len, av_full_len |
| 291 | ! Use assignment_lengths if available (preserves trailing whitespace like IFS=" ") |
| 292 | if (allocated(node%simple_cmd%assignment_lengths) .and. & |
| 293 | assign_idx <= size(node%simple_cmd%assignment_lengths)) then |
| 294 | av_full_len = node%simple_cmd%assignment_lengths(assign_idx) |
| 295 | else |
| 296 | av_full_len = len_trim(node%simple_cmd%assignments(assign_idx)) |
| 297 | end if |
| 298 | av_len = av_full_len - assign_eq_pos |
| 299 | if (av_len < 0) av_len = 0 |
| 300 | call safe_assign_alloc_str(assign_value, & |
| 301 | node%simple_cmd%assignments(assign_idx)(assign_eq_pos+1:), av_len) |
| 302 | end block |
| 303 | |
| 304 | ! Handle array element assignment: VAR[key]=value or VAR[idx]=value |
| 305 | block |
| 306 | use variables, only: is_associative_array, set_assoc_array_value, & |
| 307 | set_array_element, strip_quotes |
| 308 | integer :: ab_pos, ab_end, ab_idx_status, ab_array_index |
| 309 | character(len=256) :: ab_base_name, ab_index_str |
| 310 | |
| 311 | ab_pos = index(assign_name, '[') |
| 312 | if (ab_pos > 0) then |
| 313 | ab_end = index(assign_name(ab_pos:), ']') |
| 314 | if (ab_end > 0) then |
| 315 | ab_end = ab_pos + ab_end - 1 |
| 316 | ab_base_name = assign_name(1:ab_pos-1) |
| 317 | ab_index_str = assign_name(ab_pos+1:ab_end-1) |
| 318 | call strip_quotes(ab_index_str) |
| 319 | ! Strip lexer sentinel chars (char(1)/char(2) inserted at quote boundaries) |
| 320 | block |
| 321 | integer :: si, so |
| 322 | character(len=256) :: cleaned_key |
| 323 | cleaned_key = '' |
| 324 | so = 0 |
| 325 | do si = 1, len_trim(ab_index_str) |
| 326 | if (ab_index_str(si:si) /= char(1) .and. ab_index_str(si:si) /= char(2)) then |
| 327 | so = so + 1 |
| 328 | cleaned_key(so:so) = ab_index_str(si:si) |
| 329 | end if |
| 330 | end do |
| 331 | ab_index_str = cleaned_key |
| 332 | end block |
| 333 | |
| 334 | ! Calculate value_len for the value portion |
| 335 | if (len_trim(assign_value) > 0) then |
| 336 | value_len = len_trim(assign_value) |
| 337 | else |
| 338 | value_len = token_len - assign_eq_pos |
| 339 | if (value_len >= 2) then |
| 340 | if (node%simple_cmd%assignments(assign_idx)(assign_eq_pos+1:assign_eq_pos+1) == "'" .or. & |
| 341 | node%simple_cmd%assignments(assign_idx)(assign_eq_pos+1:assign_eq_pos+1) == '"') then |
| 342 | value_len = value_len - 2 |
| 343 | end if |
| 344 | end if |
| 345 | if (value_len <= 0) value_len = 0 |
| 346 | end if |
| 347 | |
| 348 | ! Expand variables in value if needed |
| 349 | ! Use expanded_value directly to avoid truncation in fixed-size assign_value |
| 350 | if (index(assign_value, '$') > 0 .or. index(assign_value, '~') > 0) then |
| 351 | call expand_variables(assign_value, expanded_value, shell) |
| 352 | end if |
| 353 | |
| 354 | if (is_associative_array(shell, trim(ab_base_name))) then |
| 355 | if (allocated(expanded_value)) then |
| 356 | call set_assoc_array_value(shell, trim(ab_base_name), & |
| 357 | trim(ab_index_str), expanded_value) |
| 358 | deallocate(expanded_value) |
| 359 | else |
| 360 | call set_assoc_array_value(shell, trim(ab_base_name), & |
| 361 | trim(ab_index_str), assign_value(1:value_len)) |
| 362 | end if |
| 363 | else |
| 364 | read(ab_index_str, *, iostat=ab_idx_status) ab_array_index |
| 365 | if (ab_idx_status == 0) then |
| 366 | ab_array_index = ab_array_index + 1 ! Convert to 1-indexed |
| 367 | if (allocated(expanded_value)) then |
| 368 | call set_array_element(shell, trim(ab_base_name), & |
| 369 | ab_array_index, expanded_value) |
| 370 | deallocate(expanded_value) |
| 371 | else |
| 372 | call set_array_element(shell, trim(ab_base_name), & |
| 373 | ab_array_index, assign_value(1:value_len)) |
| 374 | end if |
| 375 | else |
| 376 | write(error_unit, '(a)') 'Error: invalid array index' |
| 377 | shell%last_exit_status = 1 |
| 378 | end if |
| 379 | end if |
| 380 | cycle ! Skip normal assignment processing |
| 381 | end if |
| 382 | end if |
| 383 | end block |
| 384 | |
| 385 | ! Calculate value_len - normally use len_trim, but preserve |
| 386 | ! whitespace-only values (like IFS=" ") |
| 387 | if (len_trim(assign_value) > 0) then |
| 388 | ! Normal case: value has non-whitespace content |
| 389 | value_len = len_trim(assign_value) |
| 390 | else |
| 391 | ! Special case: value is empty or all whitespace |
| 392 | ! Use tracked length minus equals sign position |
| 393 | value_len = token_len - assign_eq_pos |
| 394 | ! Adjust for quotes if present in original |
| 395 | if (value_len >= 2) then |
| 396 | if (node%simple_cmd%assignments(assign_idx)(assign_eq_pos+1:assign_eq_pos+1) == "'" .or. & |
| 397 | node%simple_cmd%assignments(assign_idx)(assign_eq_pos+1:assign_eq_pos+1) == '"') then |
| 398 | value_len = value_len - 2 ! Remove quote characters from length |
| 399 | end if |
| 400 | end if |
| 401 | if (value_len <= 0) value_len = 0 |
| 402 | end if |
| 403 | |
| 404 | ! Check if this is an array assignment: VAR=(...) |
| 405 | if (value_len >= 2 .and. assign_value(1:1) == '(' .and. & |
| 406 | assign_value(value_len:value_len) == ')') then |
| 407 | ! Array assignment - expand variables/command substitutions first |
| 408 | block |
| 409 | use variables, only: handle_array_assignment |
| 410 | character(len=:), allocatable :: arr_expanded, arr_buf |
| 411 | if (index(assign_value(1:value_len), '$') > 0 & |
| 412 | .or. index(assign_value(1:value_len), & |
| 413 | '`') > 0) then |
| 414 | ! Expand content inside parens, then re-wrap |
| 415 | call expand_variables( & |
| 416 | assign_value(2:value_len-1), & |
| 417 | arr_expanded, shell) |
| 418 | if (allocated(arr_expanded)) then |
| 419 | arr_buf = '(' // arr_expanded // ')' |
| 420 | call handle_array_assignment(shell, & |
| 421 | trim(assign_name), & |
| 422 | arr_buf) |
| 423 | else |
| 424 | call handle_array_assignment(shell, & |
| 425 | trim(assign_name), & |
| 426 | assign_value(1:value_len)) |
| 427 | end if |
| 428 | else |
| 429 | call handle_array_assignment(shell, & |
| 430 | trim(assign_name), & |
| 431 | assign_value(1:value_len)) |
| 432 | end if |
| 433 | end block |
| 434 | ! Expand variables and command substitutions in the value |
| 435 | else if (index(assign_value, '$') > 0 .or. index(assign_value, '~') > 0) then |
| 436 | call expand_variables(assign_value, expanded_value, shell) |
| 437 | if (allocated(expanded_value)) then |
| 438 | call set_shell_variable(shell, trim(assign_name), expanded_value, len(expanded_value)) |
| 439 | else |
| 440 | call set_shell_variable(shell, trim(assign_name), '', 0) |
| 441 | end if |
| 442 | else |
| 443 | ! Preserve whitespace in value by passing explicit length |
| 444 | ! Strip sentinel characters that may be embedded |
| 445 | block |
| 446 | character(len=:), allocatable :: clean_value |
| 447 | integer :: src_i, dst_i |
| 448 | logical :: is_int_var |
| 449 | ! Use a fixed-size stack buffer for sentinel stripping — avoids |
| 450 | ! allocatable assignment (clean_value='') which corrupts on flang-new. |
| 451 | ! Safe because value_len <= MAX_TOKEN_LEN and typical values are short. |
| 452 | allocate(character(len=max(value_len, 1)) :: clean_value) |
| 453 | dst_i = 1 |
| 454 | do src_i = 1, value_len |
| 455 | if (assign_value(src_i:src_i) /= char(2) .and. & |
| 456 | assign_value(src_i:src_i) /= char(3) & |
| 457 | .and. & |
| 458 | assign_value(src_i:src_i) /= char(1)) & |
| 459 | then |
| 460 | clean_value(dst_i:dst_i) = & |
| 461 | assign_value(src_i:src_i) |
| 462 | dst_i = dst_i + 1 |
| 463 | end if |
| 464 | end do |
| 465 | ! Check integer attribute |
| 466 | is_int_var = .false. |
| 467 | do src_i = 1, shell%num_variables |
| 468 | if (trim(shell%variables(src_i)%name) & |
| 469 | == trim(assign_name)) then |
| 470 | is_int_var = & |
| 471 | shell%variables(src_i)%is_integer |
| 472 | exit |
| 473 | end if |
| 474 | end do |
| 475 | if (is_int_var .and. dst_i > 1) then |
| 476 | block |
| 477 | use expansion, only: & |
| 478 | arithmetic_expansion_shell |
| 479 | character(len=:), allocatable :: ae, ar |
| 480 | ae = '$((' // & |
| 481 | clean_value(1:dst_i-1) // '))' |
| 482 | ar = arithmetic_expansion_shell( & |
| 483 | trim(ae), shell) |
| 484 | block |
| 485 | use variables, only: safe_assign_alloc_str |
| 486 | call safe_assign_alloc_str(clean_value, ar, len_trim(ar)) |
| 487 | end block |
| 488 | dst_i = len_trim(ar) + 1 |
| 489 | end block |
| 490 | end if |
| 491 | call set_shell_variable(shell, & |
| 492 | trim(assign_name), clean_value, & |
| 493 | dst_i - 1) |
| 494 | end block |
| 495 | end if |
| 496 | |
| 497 | ! If allexport is enabled (set -a), automatically export the variable |
| 498 | if (shell%option_allexport) then |
| 499 | block |
| 500 | integer :: var_idx |
| 501 | do var_idx = 1, shell%num_variables |
| 502 | if (trim(shell%variables(var_idx)%name) == trim(assign_name)) then |
| 503 | shell%variables(var_idx)%exported = .true. |
| 504 | ! Also set in environment |
| 505 | if (.not. set_environment_var(trim(assign_name), trim(shell%variables(var_idx)%value))) then |
| 506 | ! Silently ignore export errors (POSIX behavior) |
| 507 | end if |
| 508 | exit |
| 509 | end if |
| 510 | end do |
| 511 | end block |
| 512 | end if |
| 513 | end if |
| 514 | end do |
| 515 | end block |
| 516 | end if |
| 517 | ! POSIX: Exit status of assignment is exit status of last command substitution |
| 518 | ! This covers readonly violations (127) and failed command substitutions |
| 519 | exit_status = shell%last_exit_status |
| 520 | call check_errexit(shell, exit_status) |
| 521 | return |
| 522 | end if |
| 523 | |
| 524 | ! Special handling for exec with redirections |
| 525 | if (node%simple_cmd%num_words >= 1 .and. trim(node%simple_cmd%words(1)) == 'exec') then |
| 526 | ! Check if this is exec with only redirections (no command to execute) |
| 527 | if (node%simple_cmd%num_words == 1 .and. node%simple_cmd%num_redirects > 0) then |
| 528 | ! exec without arguments but with redirections - apply redirections permanently |
| 529 | block |
| 530 | use parser, only: expand_variables |
| 531 | character(len=:), allocatable :: expanded_filename |
| 532 | do i = 1, node%simple_cmd%num_redirects |
| 533 | ! Convert AST redirection to fd_redirection format |
| 534 | temp_redirect%type = node%simple_cmd%redirects(i)%type |
| 535 | temp_redirect%fd = node%simple_cmd%redirects(i)%fd |
| 536 | temp_redirect%target_fd = node%simple_cmd%redirects(i)%target_fd |
| 537 | if (allocated(node%simple_cmd%redirects(i)%filename)) then |
| 538 | ! Expand variables in the filename (e.g., $$ -> PID) |
| 539 | call expand_variables(trim(node%simple_cmd%redirects(i)%filename), expanded_filename, shell) |
| 540 | if (allocated(expanded_filename)) then |
| 541 | temp_redirect%filename = expanded_filename |
| 542 | else |
| 543 | temp_redirect%filename = trim(node%simple_cmd%redirects(i)%filename) |
| 544 | end if |
| 545 | else |
| 546 | temp_redirect%filename = '' |
| 547 | end if |
| 548 | temp_redirect%force_clobber = node%simple_cmd%redirects(i)%force_clobber |
| 549 | |
| 550 | call apply_single_redirection(temp_redirect, redir_success, shell%option_noclobber, permanent=.true.) |
| 551 | if (.not. redir_success) then |
| 552 | exit_status = 1 |
| 553 | return |
| 554 | end if |
| 555 | end do |
| 556 | end block |
| 557 | exit_status = 0 |
| 558 | return |
| 559 | else if (node%simple_cmd%num_words == 1) then |
| 560 | ! exec without arguments or redirections - just return success |
| 561 | exit_status = 0 |
| 562 | return |
| 563 | end if |
| 564 | ! If we get here, exec has arguments, so fall through to normal execution |
| 565 | end if |
| 566 | |
| 567 | ! Check for alias expansion (before function/builtin/external lookup) |
| 568 | ! Aliases only expand in interactive mode or with shopt expand_aliases |
| 569 | if (node%simple_cmd%num_words >= 1 .and. & |
| 570 | (shell%is_interactive .or. shell%shopt_expand_aliases) .and. & |
| 571 | .not. shell%bypass_aliases .and. .not. shell%executing_trap) then |
| 572 | block |
| 573 | character(len=256) :: first_word |
| 574 | integer :: alias_i |
| 575 | first_word = trim(node%simple_cmd%words(1)) |
| 576 | do alias_i = 1, shell%num_aliases |
| 577 | if (trim(shell%aliases(alias_i)%name) == trim(first_word)) then |
| 578 | ! Found alias — rebuild command line with expansion and re-parse |
| 579 | block |
| 580 | use grammar_parser, only: parse_command_line |
| 581 | use command_tree, only: destroy_command_node |
| 582 | character(len=:), allocatable :: expanded_line |
| 583 | type(command_node_t), pointer :: alias_ast |
| 584 | integer :: word_i |
| 585 | expanded_line = trim(shell%aliases(alias_i)%command) |
| 586 | ! Append remaining arguments |
| 587 | do word_i = 2, node%simple_cmd%num_words |
| 588 | expanded_line = trim(expanded_line) // ' ' // & |
| 589 | trim(node%simple_cmd%words(word_i)) |
| 590 | end do |
| 591 | alias_ast => parse_command_line(trim(expanded_line)) |
| 592 | if (associated(alias_ast)) then |
| 593 | shell%bypass_aliases = .true. |
| 594 | exit_status = execute_ast_node(alias_ast, shell) |
| 595 | shell%bypass_aliases = .false. |
| 596 | call destroy_command_node(alias_ast) |
| 597 | end if |
| 598 | end block |
| 599 | return |
| 600 | end if |
| 601 | end do |
| 602 | end block |
| 603 | end if |
| 604 | |
| 605 | ! Check if this is a function call (unless bypass_functions is set) |
| 606 | if (node%simple_cmd%num_words >= 1) then |
| 607 | cmd_name = trim(node%simple_cmd%words(1)) |
| 608 | else |
| 609 | cmd_name = '' |
| 610 | end if |
| 611 | |
| 612 | if (.not. shell%bypass_functions .and. len_trim(cmd_name) > 0) then |
| 613 | do func_idx = 1, num_cached_functions |
| 614 | if (trim(function_ast_cache(func_idx)%name) == trim(cmd_name)) then |
| 615 | ! This is a function call! Execute the cached AST body |
| 616 | |
| 617 | ! Save old positional parameters |
| 618 | old_num_positional = shell%num_positional |
| 619 | if (allocated(shell%positional_params) .and. old_num_positional > 0) then |
| 620 | allocate(old_params(old_num_positional)) |
| 621 | block |
| 622 | integer :: k |
| 623 | do k = 1, old_num_positional |
| 624 | old_params(k)%str = shell%positional_params(k)%str |
| 625 | end do |
| 626 | end block |
| 627 | end if |
| 628 | |
| 629 | ! Set new positional parameters from function arguments |
| 630 | ! Need to expand arguments (variable expansion, command substitution, etc.) |
| 631 | if (node%simple_cmd%num_words > 1) then |
| 632 | ! Create temporary command to expand arguments |
| 633 | block |
| 634 | use pipeline_helpers, only: expand_tokens |
| 635 | type(command_t) :: temp_cmd |
| 636 | integer :: k |
| 637 | |
| 638 | temp_cmd%num_tokens = node%simple_cmd%num_words - 1 ! Exclude function name |
| 639 | allocate(character(len=MAX_TOKEN_LEN) :: temp_cmd%tokens(temp_cmd%num_tokens)) |
| 640 | allocate(temp_cmd%token_quoted(temp_cmd%num_tokens)) |
| 641 | allocate(temp_cmd%token_escaped(temp_cmd%num_tokens)) |
| 642 | allocate(temp_cmd%token_quote_type(temp_cmd%num_tokens)) |
| 643 | allocate(temp_cmd%token_lengths(temp_cmd%num_tokens)) |
| 644 | |
| 645 | ! Copy arguments (skip function name at index 1) |
| 646 | do k = 1, temp_cmd%num_tokens |
| 647 | ! For quoted words, use word_lengths to extract exact content (preserves trailing whitespace) |
| 648 | if (allocated(node%simple_cmd%word_was_quoted) .and. k+1 <= size(node%simple_cmd%word_was_quoted) .and. & |
| 649 | node%simple_cmd%word_was_quoted(k + 1) .and. & |
| 650 | allocated(node%simple_cmd%word_lengths) .and. k+1 <= size(node%simple_cmd%word_lengths)) then |
| 651 | ! Quoted word - use actual length to preserve trailing whitespace |
| 652 | temp_cmd%tokens(k) = node%simple_cmd%words(k + 1)(1:node%simple_cmd%word_lengths(k + 1)) |
| 653 | temp_cmd%token_lengths(k) = node%simple_cmd%word_lengths(k + 1) |
| 654 | else |
| 655 | ! Unquoted word - trim is safe |
| 656 | temp_cmd%tokens(k) = trim(node%simple_cmd%words(k + 1)) |
| 657 | temp_cmd%token_lengths(k) = len_trim(node%simple_cmd%words(k + 1)) |
| 658 | end if |
| 659 | if (allocated(node%simple_cmd%word_was_quoted) .and. k+1 <= size(node%simple_cmd%word_was_quoted)) then |
| 660 | temp_cmd%token_quoted(k) = node%simple_cmd%word_was_quoted(k + 1) |
| 661 | else |
| 662 | temp_cmd%token_quoted(k) = .false. |
| 663 | end if |
| 664 | if (allocated(node%simple_cmd%word_was_escaped) .and. k+1 <= size(node%simple_cmd%word_was_escaped)) then |
| 665 | temp_cmd%token_escaped(k) = node%simple_cmd%word_was_escaped(k + 1) |
| 666 | else |
| 667 | temp_cmd%token_escaped(k) = .false. |
| 668 | end if |
| 669 | if (allocated(node%simple_cmd%word_quote_type) .and. k+1 <= size(node%simple_cmd%word_quote_type)) then |
| 670 | temp_cmd%token_quote_type(k) = node%simple_cmd%word_quote_type(k + 1) |
| 671 | else |
| 672 | temp_cmd%token_quote_type(k) = QUOTE_NONE |
| 673 | end if |
| 674 | end do |
| 675 | |
| 676 | ! Expand the tokens (command substitution, arithmetic, variables, etc.) |
| 677 | call expand_tokens(temp_cmd, shell) |
| 678 | |
| 679 | ! Now use expanded tokens as positional parameters |
| 680 | shell%num_positional = temp_cmd%num_tokens |
| 681 | if (shell%num_positional > 0) then |
| 682 | if (.not. allocated(shell%positional_params)) then |
| 683 | allocate(shell%positional_params(shell%num_positional)) |
| 684 | shell%positional_params_capacity = shell%num_positional |
| 685 | else if (shell%positional_params_capacity < shell%num_positional) then |
| 686 | deallocate(shell%positional_params) |
| 687 | allocate(shell%positional_params(shell%num_positional)) |
| 688 | shell%positional_params_capacity = shell%num_positional |
| 689 | end if |
| 690 | do k = 1, shell%num_positional |
| 691 | shell%positional_params(k)%str = trim(temp_cmd%tokens(k)) |
| 692 | end do |
| 693 | end if |
| 694 | |
| 695 | ! Cleanup |
| 696 | if (allocated(temp_cmd%tokens)) deallocate(temp_cmd%tokens) |
| 697 | if (allocated(temp_cmd%token_quoted)) deallocate(temp_cmd%token_quoted) |
| 698 | if (allocated(temp_cmd%token_escaped)) deallocate(temp_cmd%token_escaped) |
| 699 | if (allocated(temp_cmd%token_quote_type)) deallocate(temp_cmd%token_quote_type) |
| 700 | if (allocated(temp_cmd%token_lengths)) deallocate(temp_cmd%token_lengths) |
| 701 | end block |
| 702 | else |
| 703 | shell%num_positional = 0 |
| 704 | end if |
| 705 | |
| 706 | ! Apply redirections for the function call |
| 707 | block |
| 708 | use fd_redirection, only: apply_single_redirection |
| 709 | use parser, only: expand_variables |
| 710 | type(redirection_t) :: temp_redirect |
| 711 | logical :: redir_success, func_has_redirects |
| 712 | character(len=:), allocatable :: expanded_filename |
| 713 | integer :: redir_idx, func_fd_mark |
| 714 | |
| 715 | func_has_redirects = (node%simple_cmd%num_redirects > 0) |
| 716 | func_fd_mark = save_fd_mark() |
| 717 | if (func_has_redirects) then |
| 718 | do redir_idx = 1, node%simple_cmd%num_redirects |
| 719 | temp_redirect%type = node%simple_cmd%redirects(redir_idx)%type |
| 720 | temp_redirect%fd = node%simple_cmd%redirects(redir_idx)%fd |
| 721 | temp_redirect%target_fd = node%simple_cmd%redirects(redir_idx)%target_fd |
| 722 | if (allocated(node%simple_cmd%redirects(redir_idx)%filename)) then |
| 723 | call expand_variables(trim(node%simple_cmd%redirects(redir_idx)%filename), expanded_filename, shell) |
| 724 | if (allocated(expanded_filename)) then |
| 725 | allocate(temp_redirect%filename, source=trim(expanded_filename)) |
| 726 | deallocate(expanded_filename) |
| 727 | else |
| 728 | allocate(temp_redirect%filename, source=trim(node%simple_cmd%redirects(redir_idx)%filename)) |
| 729 | end if |
| 730 | end if |
| 731 | temp_redirect%force_clobber = node%simple_cmd%redirects(redir_idx)%force_clobber |
| 732 | |
| 733 | call apply_single_redirection(temp_redirect, redir_success, shell%option_noclobber) |
| 734 | if (allocated(temp_redirect%filename)) deallocate(temp_redirect%filename) |
| 735 | if (.not. redir_success) then |
| 736 | call restore_fds_to_mark(func_fd_mark) |
| 737 | exit_status = 1 |
| 738 | ! Restore old positional params before returning |
| 739 | shell%num_positional = old_num_positional |
| 740 | if (allocated(old_params)) then |
| 741 | if (shell%num_positional > 0) then |
| 742 | block |
| 743 | integer :: k |
| 744 | do k = 1, old_num_positional |
| 745 | shell%positional_params(k)%str = old_params(k)%str |
| 746 | end do |
| 747 | end block |
| 748 | end if |
| 749 | deallocate(old_params) |
| 750 | end if |
| 751 | return |
| 752 | end if |
| 753 | end do |
| 754 | end if |
| 755 | |
| 756 | ! Increment function depth for return/exit context tracking |
| 757 | shell%function_depth = shell%function_depth + 1 |
| 758 | |
| 759 | ! Execute function body |
| 760 | ! Save body pointer locally so unset -f during execution can't |
| 761 | ! invalidate the pointer through the cache (Fortran aliasing) |
| 762 | block |
| 763 | type(command_node_t), pointer :: func_body |
| 764 | func_body => function_ast_cache(func_idx)%body |
| 765 | if (associated(func_body)) then |
| 766 | exit_status = execute_ast_node(func_body, shell) |
| 767 | else |
| 768 | exit_status = 0 |
| 769 | end if |
| 770 | end block |
| 771 | |
| 772 | ! Fire RETURN trap if set (before cleanup, while still in function scope) |
| 773 | block |
| 774 | use signal_handling, only: get_trap_command, TRAP_RETURN |
| 775 | character(len=256) :: return_trap_cmd |
| 776 | return_trap_cmd = get_trap_command(shell, TRAP_RETURN) |
| 777 | if (len_trim(return_trap_cmd) > 0 .and. & |
| 778 | .not. shell%executing_trap) then |
| 779 | block |
| 780 | use grammar_parser, only: parse_command_line |
| 781 | use command_tree, only: destroy_command_node |
| 782 | type(command_node_t), pointer :: trap_node |
| 783 | integer :: saved_status_rt |
| 784 | logical :: saved_bypass_rt |
| 785 | saved_status_rt = shell%last_exit_status |
| 786 | saved_bypass_rt = shell%bypass_functions |
| 787 | shell%bypass_functions = .false. |
| 788 | shell%executing_trap = .true. |
| 789 | trap_node => parse_command_line(trim(return_trap_cmd)) |
| 790 | if (associated(trap_node)) then |
| 791 | exit_status = execute_ast_node(trap_node, shell) |
| 792 | call destroy_command_node(trap_node) |
| 793 | end if |
| 794 | shell%executing_trap = .false. |
| 795 | shell%bypass_functions = saved_bypass_rt |
| 796 | shell%last_exit_status = saved_status_rt |
| 797 | end block |
| 798 | end if |
| 799 | end block |
| 800 | |
| 801 | ! Clean up local variables for this function scope |
| 802 | if (shell%function_depth > 0 .and. & |
| 803 | shell%function_depth <= size(shell%local_var_counts)) then |
| 804 | ! Check if IFS was local — restore from global variables |
| 805 | block |
| 806 | integer :: lv_idx, gv_idx |
| 807 | logical :: had_local_ifs, found_global_ifs |
| 808 | had_local_ifs = .false. |
| 809 | do lv_idx = 1, shell%local_var_counts(shell%function_depth) |
| 810 | if (trim(shell%local_vars(shell%function_depth, lv_idx)%name) == 'IFS') then |
| 811 | had_local_ifs = .true. |
| 812 | end if |
| 813 | ! Clean up local arrays from global variable storage |
| 814 | if (shell%local_vars(shell%function_depth, lv_idx)%is_array) then |
| 815 | do gv_idx = 1, shell%num_variables |
| 816 | if (trim(shell%variables(gv_idx)%name) == & |
| 817 | trim(shell%local_vars(shell%function_depth, lv_idx)%name)) then |
| 818 | shell%variables(gv_idx)%name = '' |
| 819 | shell%variables(gv_idx)%value = '' |
| 820 | shell%variables(gv_idx)%is_array = .false. |
| 821 | shell%variables(gv_idx)%array_size = 0 |
| 822 | exit |
| 823 | end if |
| 824 | end do |
| 825 | end if |
| 826 | end do |
| 827 | shell%local_var_counts(shell%function_depth) = 0 |
| 828 | if (had_local_ifs) then |
| 829 | ! Look up IFS from global variables array, bypassing local scope |
| 830 | found_global_ifs = .false. |
| 831 | do gv_idx = 1, shell%num_variables |
| 832 | if (trim(shell%variables(gv_idx)%name) == 'IFS') then |
| 833 | shell%ifs_len = shell%variables(gv_idx)%value_len |
| 834 | if (shell%ifs_len <= 0) & |
| 835 | shell%ifs_len = len_trim(shell%variables(gv_idx)%value) |
| 836 | if (shell%ifs_len > len(shell%ifs)) & |
| 837 | shell%ifs_len = len(shell%ifs) |
| 838 | shell%ifs = '' |
| 839 | if (shell%ifs_len > 0) shell%ifs(1:shell%ifs_len) = & |
| 840 | shell%variables(gv_idx)%value(1:shell%ifs_len) |
| 841 | found_global_ifs = .true. |
| 842 | exit |
| 843 | end if |
| 844 | end do |
| 845 | if (.not. found_global_ifs) then |
| 846 | ! IFS was never explicitly set globally — restore default |
| 847 | shell%ifs = ' ' // char(9) // char(10) |
| 848 | shell%ifs_len = 3 |
| 849 | end if |
| 850 | end if |
| 851 | end block |
| 852 | end if |
| 853 | |
| 854 | ! Decrement function depth |
| 855 | shell%function_depth = shell%function_depth - 1 |
| 856 | |
| 857 | ! Restore file descriptors if we applied redirections |
| 858 | if (func_has_redirects) then |
| 859 | call restore_fds_to_mark(func_fd_mark) |
| 860 | end if |
| 861 | end block |
| 862 | |
| 863 | ! Clear function return flag and use return value as exit status |
| 864 | if (shell%function_return_pending) then |
| 865 | exit_status = shell%function_return_value |
| 866 | shell%function_return_pending = .false. |
| 867 | end if |
| 868 | |
| 869 | ! Restore old positional parameters |
| 870 | shell%num_positional = old_num_positional |
| 871 | if (allocated(old_params)) then |
| 872 | if (shell%num_positional > 0) then |
| 873 | block |
| 874 | integer :: k |
| 875 | do k = 1, old_num_positional |
| 876 | shell%positional_params(k)%str = old_params(k)%str |
| 877 | end do |
| 878 | end block |
| 879 | end if |
| 880 | deallocate(old_params) |
| 881 | end if |
| 882 | |
| 883 | ! POSIX: exit in function should exit shell, not just return from function |
| 884 | ! Preserve shell%last_exit_status which was set by builtin_exit |
| 885 | if (.not. shell%running) then |
| 886 | exit_status = shell%last_exit_status |
| 887 | end if |
| 888 | |
| 889 | return |
| 890 | end if |
| 891 | end do |
| 892 | end if ! .not. shell%bypass_functions |
| 893 | |
| 894 | ! Convert AST simple command to command_t format for legacy executor dispatch. |
| 895 | ! Pipeline execution is now handled directly by execute_pipeline_node (Phases 1-6). |
| 896 | ! This conversion remains for individual command execution (builtins, externals, |
| 897 | ! assignments, aliases, etc.) which still delegates to execute_single. |
| 898 | |
| 899 | allocate(temp_pipeline%commands(1)) |
| 900 | temp_pipeline%num_commands = 1 |
| 901 | |
| 902 | ! Initialize command in place (avoid structure copy issues) |
| 903 | temp_pipeline%commands(1)%num_tokens = node%simple_cmd%num_words |
| 904 | temp_pipeline%commands(1)%separator = SEP_NONE |
| 905 | temp_pipeline%commands(1)%background = .false. |
| 906 | temp_pipeline%commands(1)%num_redirections = 0 |
| 907 | ! Copy prefix assignments from AST |
| 908 | temp_pipeline%commands(1)%num_prefix_assignments = node%simple_cmd%num_assignments |
| 909 | if (node%simple_cmd%num_assignments > 0 .and. allocated(node%simple_cmd%assignments)) then |
| 910 | if (.not. allocated(temp_pipeline%commands(1)%prefix_assignments)) then |
| 911 | allocate(character(len=MAX_TOKEN_LEN) :: & |
| 912 | temp_pipeline%commands(1)%prefix_assignments(MAX_PREFIX_ASSIGNMENTS)) |
| 913 | end if |
| 914 | do i = 1, node%simple_cmd%num_assignments |
| 915 | temp_pipeline%commands(1)%prefix_assignments(i) = node%simple_cmd%assignments(i) |
| 916 | end do |
| 917 | end if |
| 918 | ! Check if words were pre-expanded in pipeline |
| 919 | temp_pipeline%commands(1)%skip_expansion = node%simple_cmd%pre_expanded |
| 920 | |
| 921 | |
| 922 | ! Allocate tokens array — use actual word width if pre-expanded (may be > MAX_TOKEN_LEN) |
| 923 | block |
| 924 | integer :: tok_alloc_len |
| 925 | if (node%simple_cmd%pre_expanded .and. allocated(node%simple_cmd%words) .and. & |
| 926 | node%simple_cmd%num_words > 0) then |
| 927 | tok_alloc_len = max(MAX_TOKEN_LEN, len(node%simple_cmd%words(1))) |
| 928 | else |
| 929 | tok_alloc_len = MAX_TOKEN_LEN |
| 930 | end if |
| 931 | allocate(character(len=tok_alloc_len) :: temp_pipeline%commands(1)%tokens(node%simple_cmd%num_words)) |
| 932 | end block |
| 933 | |
| 934 | ! Allocate metadata arrays to track token properties |
| 935 | allocate(temp_pipeline%commands(1)%token_quoted(node%simple_cmd%num_words)) |
| 936 | allocate(temp_pipeline%commands(1)%token_escaped(node%simple_cmd%num_words)) |
| 937 | allocate(temp_pipeline%commands(1)%token_quote_type(node%simple_cmd%num_words)) |
| 938 | allocate(temp_pipeline%commands(1)%token_lengths(node%simple_cmd%num_words)) |
| 939 | |
| 940 | ! Initialize metadata arrays |
| 941 | temp_pipeline%commands(1)%token_quoted = .false. |
| 942 | temp_pipeline%commands(1)%token_escaped = .false. |
| 943 | temp_pipeline%commands(1)%token_quote_type = QUOTE_NONE |
| 944 | temp_pipeline%commands(1)%token_lengths = 0 |
| 945 | |
| 946 | ! Copy words to tokens and metadata |
| 947 | do i = 1, node%simple_cmd%num_words |
| 948 | ! For quoted words, use word_lengths to extract exact content (preserves trailing whitespace) |
| 949 | ! For unquoted words, trim is safe |
| 950 | if (allocated(node%simple_cmd%word_was_quoted) .and. & |
| 951 | i <= size(node%simple_cmd%word_was_quoted) .and. & |
| 952 | node%simple_cmd%word_was_quoted(i) .and. & |
| 953 | allocated(node%simple_cmd%word_lengths) .and. & |
| 954 | i <= size(node%simple_cmd%word_lengths)) then |
| 955 | ! Quoted word - use actual length to preserve trailing whitespace |
| 956 | temp_pipeline%commands(1)%tokens(i) = node%simple_cmd%words(i)(1:node%simple_cmd%word_lengths(i)) |
| 957 | temp_pipeline%commands(1)%token_lengths(i) = node%simple_cmd%word_lengths(i) |
| 958 | else |
| 959 | ! Unquoted word - trim is safe |
| 960 | temp_pipeline%commands(1)%tokens(i) = trim(node%simple_cmd%words(i)) |
| 961 | temp_pipeline%commands(1)%token_lengths(i) = len_trim(node%simple_cmd%words(i)) |
| 962 | end if |
| 963 | |
| 964 | ! Copy metadata if available |
| 965 | if (allocated(node%simple_cmd%word_was_quoted) .and. & |
| 966 | i <= size(node%simple_cmd%word_was_quoted)) then |
| 967 | temp_pipeline%commands(1)%token_quoted(i) = node%simple_cmd%word_was_quoted(i) |
| 968 | end if |
| 969 | |
| 970 | if (allocated(node%simple_cmd%word_was_escaped) .and. & |
| 971 | i <= size(node%simple_cmd%word_was_escaped)) then |
| 972 | temp_pipeline%commands(1)%token_escaped(i) = node%simple_cmd%word_was_escaped(i) |
| 973 | end if |
| 974 | |
| 975 | if (allocated(node%simple_cmd%word_quote_type) .and. & |
| 976 | i <= size(node%simple_cmd%word_quote_type)) then |
| 977 | temp_pipeline%commands(1)%token_quote_type(i) = node%simple_cmd%word_quote_type(i) |
| 978 | end if |
| 979 | end do |
| 980 | |
| 981 | ! Copy heredoc delimiter if present (content will be read by executor) |
| 982 | if (len_trim(node%simple_cmd%heredoc_delimiter) > 0) then |
| 983 | temp_pipeline%commands(1)%heredoc_delimiter = trim(node%simple_cmd%heredoc_delimiter) |
| 984 | temp_pipeline%commands(1)%heredoc_quoted = node%simple_cmd%heredoc_quoted |
| 985 | temp_pipeline%commands(1)%heredoc_strip_tabs = node%simple_cmd%heredoc_strip_tabs |
| 986 | end if |
| 987 | |
| 988 | ! POSIX: For pure assignments (no command), process assignments BEFORE redirections |
| 989 | ! This ensures assignment errors go to the shell's original stderr, not the redirected one |
| 990 | if (node%simple_cmd%num_words > 0) then |
| 991 | ! Check if all words are assignments (VAR=value pattern) |
| 992 | is_pure_assignment = .true. |
| 993 | do i = 1, node%simple_cmd%num_words |
| 994 | eq_pos = index(trim(node%simple_cmd%words(i)), '=') |
| 995 | if (eq_pos <= 1) then |
| 996 | is_pure_assignment = .false. |
| 997 | exit |
| 998 | end if |
| 999 | ! Check that everything before = is a valid var name |
| 1000 | if (.not. is_valid_assignment_name(node%simple_cmd%words(i)(1:eq_pos-1))) then |
| 1001 | is_pure_assignment = .false. |
| 1002 | exit |
| 1003 | end if |
| 1004 | end do |
| 1005 | |
| 1006 | if (is_pure_assignment) then |
| 1007 | ! Execute assignments before redirections |
| 1008 | call execute_pipeline(temp_pipeline, shell, trim(shell%current_command)) |
| 1009 | exit_status = shell%last_exit_status |
| 1010 | |
| 1011 | ! Clean up and return - skip redirections for pure assignments |
| 1012 | if (allocated(temp_pipeline%commands)) then |
| 1013 | if (allocated(temp_pipeline%commands(1)%tokens)) deallocate(temp_pipeline%commands(1)%tokens) |
| 1014 | if (allocated(temp_pipeline%commands(1)%token_quoted)) deallocate(temp_pipeline%commands(1)%token_quoted) |
| 1015 | if (allocated(temp_pipeline%commands(1)%token_escaped)) deallocate(temp_pipeline%commands(1)%token_escaped) |
| 1016 | if (allocated(temp_pipeline%commands(1)%token_quote_type)) deallocate(temp_pipeline%commands(1)%token_quote_type) |
| 1017 | if (allocated(temp_pipeline%commands(1)%token_lengths)) deallocate(temp_pipeline%commands(1)%token_lengths) |
| 1018 | deallocate(temp_pipeline%commands) |
| 1019 | end if |
| 1020 | return |
| 1021 | end if |
| 1022 | end if |
| 1023 | |
| 1024 | ! Apply redirections directly (in order, left-to-right) before executing |
| 1025 | ! This preserves proper ordering for cases like: echo test >/tmp/r1 2>&1 >/tmp/r2 |
| 1026 | has_redirects = (node%simple_cmd%num_redirects > 0) |
| 1027 | fd_mark = save_fd_mark() |
| 1028 | if (has_redirects) then |
| 1029 | do i = 1, node%simple_cmd%num_redirects |
| 1030 | temp_redirect%type = node%simple_cmd%redirects(i)%type |
| 1031 | temp_redirect%fd = node%simple_cmd%redirects(i)%fd |
| 1032 | temp_redirect%target_fd = node%simple_cmd%redirects(i)%target_fd |
| 1033 | if (allocated(node%simple_cmd%redirects(i)%filename)) then |
| 1034 | ! Expand variables in redirect filename (e.g., /tmp/file$$) |
| 1035 | ! For here-strings, preserve trailing whitespace |
| 1036 | if (temp_redirect%type == REDIR_HERE_STRING) then |
| 1037 | block |
| 1038 | integer :: hs_len |
| 1039 | hs_len = len(node%simple_cmd%redirects(i)%filename) |
| 1040 | if (index(node%simple_cmd%redirects(i)%filename, & |
| 1041 | '$') > 0 .or. & |
| 1042 | index(node%simple_cmd%redirects(i)%filename, & |
| 1043 | '`') > 0) then |
| 1044 | call expand_variables( & |
| 1045 | node%simple_cmd%redirects(i)%filename, & |
| 1046 | expanded_filename, shell) |
| 1047 | if (allocated(expanded_filename)) then |
| 1048 | allocate(temp_redirect%filename, & |
| 1049 | source=expanded_filename) |
| 1050 | else |
| 1051 | allocate(temp_redirect%filename, & |
| 1052 | source= & |
| 1053 | node%simple_cmd%redirects(i)%filename) |
| 1054 | end if |
| 1055 | else |
| 1056 | allocate(temp_redirect%filename, & |
| 1057 | source= & |
| 1058 | node%simple_cmd%redirects(i)%filename) |
| 1059 | end if |
| 1060 | end block |
| 1061 | else |
| 1062 | call expand_variables( & |
| 1063 | trim(node%simple_cmd%redirects(i)%filename), & |
| 1064 | expanded_filename, shell) |
| 1065 | if (allocated(expanded_filename)) then |
| 1066 | allocate(temp_redirect%filename, & |
| 1067 | source=expanded_filename) |
| 1068 | else |
| 1069 | allocate(temp_redirect%filename, & |
| 1070 | source=trim( & |
| 1071 | node%simple_cmd%redirects(i)%filename)) |
| 1072 | end if |
| 1073 | end if |
| 1074 | end if |
| 1075 | temp_redirect%force_clobber = node%simple_cmd%redirects(i)%force_clobber |
| 1076 | |
| 1077 | ! For dup redirections with filename (variable-expanded fd), |
| 1078 | ! parse the expanded filename as fd number |
| 1079 | if ((temp_redirect%type == REDIR_DUP_OUT .or. & |
| 1080 | temp_redirect%type == REDIR_DUP_IN) .and. & |
| 1081 | allocated(temp_redirect%filename)) then |
| 1082 | block |
| 1083 | integer :: dup_fd, dup_ios |
| 1084 | read(temp_redirect%filename, *, & |
| 1085 | iostat=dup_ios) dup_fd |
| 1086 | if (dup_ios == 0) then |
| 1087 | temp_redirect%target_fd = dup_fd |
| 1088 | deallocate(temp_redirect%filename) |
| 1089 | end if |
| 1090 | end block |
| 1091 | end if |
| 1092 | |
| 1093 | call apply_single_redirection(temp_redirect, redir_success, shell%option_noclobber) |
| 1094 | if (allocated(temp_redirect%filename)) deallocate(temp_redirect%filename) |
| 1095 | if (.not. redir_success) then |
| 1096 | exit_status = 1 |
| 1097 | if (allocated(temp_pipeline%commands)) then |
| 1098 | if (allocated(temp_pipeline%commands(1)%tokens)) deallocate(temp_pipeline%commands(1)%tokens) |
| 1099 | if (allocated(temp_pipeline%commands(1)%token_quoted)) deallocate(temp_pipeline%commands(1)%token_quoted) |
| 1100 | if (allocated(temp_pipeline%commands(1)%token_escaped)) deallocate(temp_pipeline%commands(1)%token_escaped) |
| 1101 | if (allocated(temp_pipeline%commands(1)%token_quote_type)) deallocate(temp_pipeline%commands(1)%token_quote_type) |
| 1102 | if (allocated(temp_pipeline%commands(1)%token_lengths)) deallocate(temp_pipeline%commands(1)%token_lengths) |
| 1103 | deallocate(temp_pipeline%commands) |
| 1104 | end if |
| 1105 | call restore_fds_to_mark(fd_mark) |
| 1106 | return |
| 1107 | end if |
| 1108 | end do |
| 1109 | end if |
| 1110 | |
| 1111 | ! Execute using existing executor |
| 1112 | ! Note: Pass empty command line - tokens array is what matters |
| 1113 | call execute_pipeline(temp_pipeline, shell, trim(shell%current_command)) |
| 1114 | |
| 1115 | exit_status = shell%last_exit_status |
| 1116 | ! POSIX: Check errexit after command execution (including assignments with command substitutions) |
| 1117 | call check_errexit(shell, exit_status) |
| 1118 | ! If errexit triggered, return immediately |
| 1119 | if (.not. shell%running) then |
| 1120 | return |
| 1121 | end if |
| 1122 | |
| 1123 | ! Check if fatal expansion error occurred (e.g., set -u with undefined variable) |
| 1124 | if (shell%fatal_expansion_error) then |
| 1125 | ! NOTE: Don't reset fatal_expansion_error here - let it propagate to subshell handler |
| 1126 | ! The subshell code needs to know about the error to adjust exit code (127 -> 1) |
| 1127 | ! POSIX: In non-interactive shells, exit the shell entirely |
| 1128 | if (.not. shell%is_interactive) then |
| 1129 | shell%running = .false. |
| 1130 | end if |
| 1131 | ! Exit status was already set by expansion code (usually 127) |
| 1132 | ! Just clean up and return |
| 1133 | if (has_redirects) then |
| 1134 | call restore_fds_to_mark(fd_mark) |
| 1135 | end if |
| 1136 | if (allocated(temp_pipeline%commands)) then |
| 1137 | if (allocated(temp_pipeline%commands(1)%tokens)) deallocate(temp_pipeline%commands(1)%tokens) |
| 1138 | if (allocated(temp_pipeline%commands(1)%token_quoted)) deallocate(temp_pipeline%commands(1)%token_quoted) |
| 1139 | if (allocated(temp_pipeline%commands(1)%token_escaped)) deallocate(temp_pipeline%commands(1)%token_escaped) |
| 1140 | if (allocated(temp_pipeline%commands(1)%token_quote_type)) deallocate(temp_pipeline%commands(1)%token_quote_type) |
| 1141 | if (allocated(temp_pipeline%commands(1)%token_lengths)) deallocate(temp_pipeline%commands(1)%token_lengths) |
| 1142 | deallocate(temp_pipeline%commands) |
| 1143 | end if |
| 1144 | return |
| 1145 | end if |
| 1146 | |
| 1147 | ! Restore file descriptors if we applied any redirections |
| 1148 | if (has_redirects) then |
| 1149 | call restore_fds_to_mark(fd_mark) |
| 1150 | end if |
| 1151 | |
| 1152 | ! Check for pending signals and dispatch their trap handlers |
| 1153 | if (.not. shell%executing_trap) then |
| 1154 | call dispatch_pending_signals(shell) |
| 1155 | end if |
| 1156 | |
| 1157 | ! If a trap command was queued, execute it now (unless we're already executing a trap) |
| 1158 | if (len_trim(shell%pending_trap_command) > 0 .and. .not. shell%executing_trap) then |
| 1159 | call execute_pending_trap(shell) |
| 1160 | end if |
| 1161 | |
| 1162 | ! POSIX: Update $_ to last argument of previous command |
| 1163 | if (node%simple_cmd%num_words > 0 .and. allocated(node%simple_cmd%words)) then |
| 1164 | shell%last_arg = trim(node%simple_cmd%words(node%simple_cmd%num_words)) |
| 1165 | end if |
| 1166 | |
| 1167 | ! Clean up |
| 1168 | if (allocated(temp_pipeline%commands)) then |
| 1169 | if (allocated(temp_pipeline%commands(1)%tokens)) deallocate(temp_pipeline%commands(1)%tokens) |
| 1170 | if (allocated(temp_pipeline%commands(1)%token_quoted)) deallocate(temp_pipeline%commands(1)%token_quoted) |
| 1171 | if (allocated(temp_pipeline%commands(1)%token_escaped)) deallocate(temp_pipeline%commands(1)%token_escaped) |
| 1172 | if (allocated(temp_pipeline%commands(1)%token_quote_type)) deallocate(temp_pipeline%commands(1)%token_quote_type) |
| 1173 | if (allocated(temp_pipeline%commands(1)%token_lengths)) deallocate(temp_pipeline%commands(1)%token_lengths) |
| 1174 | deallocate(temp_pipeline%commands) |
| 1175 | end if |
| 1176 | |
| 1177 | end function execute_simple_command |
| 1178 | |
| 1179 | ! ===================================== |
| 1180 | ! Pipeline Execution |
| 1181 | ! ===================================== |
| 1182 | |
| 1183 | function execute_pipeline_node(node, shell) result(exit_status) |
| 1184 | type(command_node_t), pointer, intent(in) :: node |
| 1185 | type(shell_state_t), intent(inout) :: shell |
| 1186 | integer :: exit_status |
| 1187 | integer :: i, status, ret, pipe_idx |
| 1188 | integer(c_int), allocatable, target :: pipefd(:,:) |
| 1189 | integer(c_pid_t), allocatable :: pids(:) |
| 1190 | integer(c_pid_t) :: pgid |
| 1191 | integer :: num_pipes, num_commands |
| 1192 | |
| 1193 | exit_status = 0 |
| 1194 | |
| 1195 | if (.not. associated(node%pipeline)) then |
| 1196 | exit_status = 0 |
| 1197 | return |
| 1198 | end if |
| 1199 | |
| 1200 | if (node%pipeline%num_commands == 0) then |
| 1201 | exit_status = 0 |
| 1202 | return |
| 1203 | end if |
| 1204 | |
| 1205 | if (node%pipeline%num_commands == 1) then |
| 1206 | ! Single command - no piping needed |
| 1207 | if (associated(node%pipeline%commands)) then |
| 1208 | ! POSIX: Suppress errexit for negated pipelines |
| 1209 | if (node%pipeline%negate) shell%in_negation = .true. |
| 1210 | exit_status = execute_ast_node(node%pipeline%commands(1), shell) |
| 1211 | shell%in_negation = .false. |
| 1212 | end if |
| 1213 | |
| 1214 | ! Handle negation |
| 1215 | if (node%pipeline%negate) then |
| 1216 | if (exit_status == 0) then |
| 1217 | exit_status = 1 |
| 1218 | else |
| 1219 | exit_status = 0 |
| 1220 | end if |
| 1221 | end if |
| 1222 | return |
| 1223 | end if |
| 1224 | |
| 1225 | ! Multiple commands - set up pipes |
| 1226 | num_commands = node%pipeline%num_commands |
| 1227 | num_pipes = num_commands - 1 |
| 1228 | |
| 1229 | allocate(pipefd(2, num_pipes), stat=i) |
| 1230 | if (i /= 0) then |
| 1231 | write(error_unit, '(A)') 'fortsh: failed to allocate pipe descriptors' |
| 1232 | exit_status = 1 |
| 1233 | return |
| 1234 | end if |
| 1235 | allocate(pids(num_commands), stat=i) |
| 1236 | if (i /= 0) then |
| 1237 | write(error_unit, '(A)') 'fortsh: failed to allocate pid array' |
| 1238 | deallocate(pipefd) |
| 1239 | exit_status = 1 |
| 1240 | return |
| 1241 | end if |
| 1242 | |
| 1243 | ! POSIX: Pre-expand all command words before forking |
| 1244 | ! This ensures expansion errors go to the parent shell's stderr |
| 1245 | block |
| 1246 | logical :: was_running |
| 1247 | was_running = shell%running |
| 1248 | call pre_expand_pipeline(node, shell) |
| 1249 | ! Restore shell state - pipeline should still run even if expansion failed |
| 1250 | ! The error message already went to stderr; pipeline continues with expanded values |
| 1251 | shell%fatal_expansion_error = .false. |
| 1252 | shell%arithmetic_error = .false. |
| 1253 | shell%running = was_running |
| 1254 | end block |
| 1255 | |
| 1256 | ! Create all pipes |
| 1257 | do i = 1, num_pipes |
| 1258 | if (c_pipe(c_loc(pipefd(1, i))) /= 0) then |
| 1259 | write(error_unit, '(A)') 'fortsh: pipe creation failed' |
| 1260 | exit_status = 1 |
| 1261 | deallocate(pipefd) |
| 1262 | deallocate(pids) |
| 1263 | return |
| 1264 | end if |
| 1265 | end do |
| 1266 | |
| 1267 | ! Xtrace: trace all pipeline commands BEFORE forking (deterministic order) |
| 1268 | ! Child processes will have xtrace suppressed to avoid double-tracing |
| 1269 | if (shell%option_xtrace) then |
| 1270 | call ast_trace_pipeline(node, shell) |
| 1271 | end if |
| 1272 | |
| 1273 | ! Flush all output before forking to prevent buffer duplication |
| 1274 | flush(output_unit) |
| 1275 | flush(error_unit) |
| 1276 | |
| 1277 | ! Fork and execute each command in the pipeline |
| 1278 | do i = 1, num_commands |
| 1279 | pids(i) = c_fork() |
| 1280 | |
| 1281 | if (pids(i) == 0) then |
| 1282 | ! Child process — mark as pipeline child so execute_external |
| 1283 | ! skips setpgid/tcsetpgrp (managed at pipeline level instead) |
| 1284 | shell%in_pipeline_child = .true. |
| 1285 | |
| 1286 | ! Set process group: all pipeline children share the first child's PID |
| 1287 | ! as their process group. Both child and parent call setpgid (race-free). |
| 1288 | if (i == 1) then |
| 1289 | pgid = c_getpid() |
| 1290 | else |
| 1291 | pgid = pids(1) |
| 1292 | end if |
| 1293 | ret = c_setpgid(0, pgid) |
| 1294 | |
| 1295 | ! Reset all signal handlers to default for pipeline children. |
| 1296 | ! Safe now because execute_external skips its own setpgid/tcsetpgrp |
| 1297 | ! when in_pipeline_child is set, so SIGTTOU won't stop the process. |
| 1298 | block |
| 1299 | type(c_funptr) :: old_handler |
| 1300 | old_handler = c_signal(SIGINT, c_null_funptr) |
| 1301 | old_handler = c_signal(SIGPIPE, c_null_funptr) |
| 1302 | old_handler = c_signal(SIGTSTP, c_null_funptr) |
| 1303 | old_handler = c_signal(SIGTTIN, c_null_funptr) |
| 1304 | old_handler = c_signal(SIGTTOU, c_null_funptr) |
| 1305 | end block |
| 1306 | |
| 1307 | ! Set up stdin from previous pipe |
| 1308 | if (i > 1) then |
| 1309 | pipe_idx = i - 1 |
| 1310 | ret = c_dup2(pipefd(1, pipe_idx), int(0, c_int)) ! Read from previous pipe |
| 1311 | end if |
| 1312 | |
| 1313 | ! Set up stdout to next pipe |
| 1314 | if (i < num_commands) then |
| 1315 | ret = c_dup2(pipefd(2, i), int(1, c_int)) ! Write to next pipe |
| 1316 | end if |
| 1317 | |
| 1318 | ! Close all pipe fds |
| 1319 | call close_all_pipes(pipefd, num_pipes) |
| 1320 | |
| 1321 | ! Suppress xtrace in child — parent already traced deterministically |
| 1322 | shell%option_xtrace = .false. |
| 1323 | |
| 1324 | ! POSIX: Only ignored traps (empty action) are visible in subshells |
| 1325 | ! Remove traps with commands, but keep traps with empty actions (ignore) |
| 1326 | call filter_traps_for_subshell(shell) |
| 1327 | |
| 1328 | ! Execute command |
| 1329 | status = execute_ast_node(node%pipeline%commands(i), shell) |
| 1330 | call c_exit(status) |
| 1331 | end if |
| 1332 | |
| 1333 | ! Parent: set process group (race-free — both parent and child call setpgid) |
| 1334 | if (pids(i) > 0) then |
| 1335 | if (i == 1) then |
| 1336 | pgid = pids(1) |
| 1337 | end if |
| 1338 | ret = c_setpgid(pids(i), pgid) |
| 1339 | else |
| 1340 | ! Fork failed — close all pipes and return |
| 1341 | write(error_unit, '(A)') 'fortsh: fork: resource temporarily unavailable' |
| 1342 | call close_all_pipes(pipefd, num_pipes) |
| 1343 | exit_status = 1 |
| 1344 | return |
| 1345 | end if |
| 1346 | end do |
| 1347 | |
| 1348 | ! Parent process - close all pipes |
| 1349 | call close_all_pipes(pipefd, num_pipes) |
| 1350 | |
| 1351 | if (node%pipeline%background) then |
| 1352 | ! Background pipeline: add job, don't wait |
| 1353 | block |
| 1354 | integer :: job_id |
| 1355 | character(len=:), allocatable :: job_command |
| 1356 | job_command = '' |
| 1357 | ! Reconstruct command string from pipeline words |
| 1358 | do i = 1, node%pipeline%num_commands |
| 1359 | if (i > 1) job_command = trim(job_command) // ' | ' |
| 1360 | if (associated(node%pipeline%commands(i)%simple_cmd)) then |
| 1361 | block |
| 1362 | integer :: w |
| 1363 | do w = 1, node%pipeline%commands(i)%simple_cmd%num_words |
| 1364 | if (w == 1 .and. i == 1) then |
| 1365 | job_command = trim(node%pipeline%commands(i)%simple_cmd%words(w)) |
| 1366 | else if (w == 1) then |
| 1367 | job_command = trim(job_command) // & |
| 1368 | trim(node%pipeline%commands(i)%simple_cmd%words(w)) |
| 1369 | else |
| 1370 | job_command = trim(job_command) // ' ' // & |
| 1371 | trim(node%pipeline%commands(i)%simple_cmd%words(w)) |
| 1372 | end if |
| 1373 | end do |
| 1374 | end block |
| 1375 | end if |
| 1376 | end do |
| 1377 | job_id = add_job(shell, pgid, trim(job_command), .false.) |
| 1378 | if (shell%is_interactive) then |
| 1379 | write(output_unit, '(a,i0,a,i0)') '[', job_id, '] ', pids(1) |
| 1380 | end if |
| 1381 | shell%last_bg_pid = pids(num_commands) |
| 1382 | end block |
| 1383 | exit_status = 0 |
| 1384 | else |
| 1385 | ! Foreground pipeline: give terminal, wait, restore terminal |
| 1386 | if (shell%is_interactive) then |
| 1387 | ret = c_tcsetpgrp(shell%shell_terminal, pgid) |
| 1388 | end if |
| 1389 | |
| 1390 | ! Wait for all children and collect exit statuses |
| 1391 | block |
| 1392 | integer(c_int), target :: wait_status |
| 1393 | integer, allocatable :: exit_statuses(:) |
| 1394 | logical :: pipeline_stopped |
| 1395 | integer :: stopped_job_id |
| 1396 | character(len=1024) :: stopped_cmd |
| 1397 | allocate(exit_statuses(num_commands)) |
| 1398 | pipeline_stopped = .false. |
| 1399 | |
| 1400 | do i = 1, num_commands |
| 1401 | ret = c_waitpid(pids(i), c_loc(wait_status), WUNTRACED) |
| 1402 | if (ret > 0) then |
| 1403 | if (WIFEXITED(wait_status)) then |
| 1404 | exit_statuses(i) = WEXITSTATUS(wait_status) |
| 1405 | else if (WIFSIGNALED(wait_status)) then |
| 1406 | exit_statuses(i) = 128 + WTERMSIG(wait_status) |
| 1407 | else if (WIFSTOPPED(wait_status)) then |
| 1408 | ! Process was stopped (Ctrl+Z) — add to job table as stopped |
| 1409 | exit_statuses(i) = 128 + WSTOPSIG(wait_status) |
| 1410 | ! Pipeline process was stopped (Ctrl+Z) |
| 1411 | ! Note: simple commands go through the legacy executor which |
| 1412 | ! handles WIFSTOPPED, add_job, and Stopped message. This path |
| 1413 | ! only runs for multi-command pipelines. |
| 1414 | if (.not. pipeline_stopped) then |
| 1415 | pipeline_stopped = .true. |
| 1416 | stopped_cmd = trim(shell%current_command) |
| 1417 | if (len_trim(stopped_cmd) == 0) stopped_cmd = '<stopped job>' |
| 1418 | stopped_job_id = add_job(shell, pgid, trim(stopped_cmd), .true.) |
| 1419 | ! Mark job as stopped in the job table |
| 1420 | block |
| 1421 | integer :: ji |
| 1422 | do ji = 1, MAX_JOBS |
| 1423 | if (shell%jobs(ji)%job_id == stopped_job_id) then |
| 1424 | shell%jobs(ji)%state = JOB_STOPPED |
| 1425 | exit |
| 1426 | end if |
| 1427 | end do |
| 1428 | end block |
| 1429 | write(output_unit, '()') |
| 1430 | write(output_unit, '(a)') 'Stopped' |
| 1431 | flush(output_unit) |
| 1432 | end if |
| 1433 | else |
| 1434 | exit_statuses(i) = 1 |
| 1435 | end if |
| 1436 | else |
| 1437 | exit_statuses(i) = 1 |
| 1438 | end if |
| 1439 | end do |
| 1440 | |
| 1441 | ! Populate PIPESTATUS array (bash extension) |
| 1442 | block |
| 1443 | use variables, only: set_array_variable |
| 1444 | character(len=16) :: pipestatus_vals(num_commands) |
| 1445 | do i = 1, num_commands |
| 1446 | write(pipestatus_vals(i), '(I0)') exit_statuses(i) |
| 1447 | end do |
| 1448 | call set_array_variable(shell, 'PIPESTATUS', pipestatus_vals, num_commands) |
| 1449 | end block |
| 1450 | |
| 1451 | ! POSIX default: exit status from last command |
| 1452 | ! pipefail: rightmost non-zero exit status |
| 1453 | if (shell%option_pipefail) then |
| 1454 | exit_status = 0 |
| 1455 | do i = num_commands, 1, -1 |
| 1456 | if (exit_statuses(i) /= 0) then |
| 1457 | exit_status = exit_statuses(i) |
| 1458 | exit |
| 1459 | end if |
| 1460 | end do |
| 1461 | else |
| 1462 | exit_status = exit_statuses(num_commands) |
| 1463 | end if |
| 1464 | |
| 1465 | deallocate(exit_statuses) |
| 1466 | end block |
| 1467 | |
| 1468 | ! Restore terminal control to the shell's process group |
| 1469 | if (shell%is_interactive) then |
| 1470 | ret = c_tcsetpgrp(shell%shell_terminal, shell%shell_pgid) |
| 1471 | end if |
| 1472 | end if |
| 1473 | |
| 1474 | deallocate(pipefd) |
| 1475 | deallocate(pids) |
| 1476 | |
| 1477 | ! Handle negation |
| 1478 | if (node%pipeline%negate) then |
| 1479 | if (exit_status == 0) then |
| 1480 | exit_status = 1 |
| 1481 | else |
| 1482 | exit_status = 0 |
| 1483 | end if |
| 1484 | end if |
| 1485 | |
| 1486 | ! POSIX: Check errexit after pipeline execution (e.g., pipefail + errexit) |
| 1487 | shell%last_exit_status = exit_status |
| 1488 | call check_errexit(shell, exit_status) |
| 1489 | |
| 1490 | end function execute_pipeline_node |
| 1491 | |
| 1492 | ! ===================================== |
| 1493 | ! List Execution (;, &&, ||, &) |
| 1494 | ! ===================================== |
| 1495 | |
| 1496 | recursive function execute_list_node(node, shell) result(exit_status) |
| 1497 | use iso_fortran_env, only: error_unit |
| 1498 | type(command_node_t), pointer, intent(in) :: node |
| 1499 | type(shell_state_t), intent(inout) :: shell |
| 1500 | integer :: exit_status, left_status |
| 1501 | integer(c_pid_t) :: pid |
| 1502 | integer :: status |
| 1503 | character(len=:), allocatable :: job_command, job_command2 |
| 1504 | integer :: i, j |
| 1505 | |
| 1506 | exit_status = 0 |
| 1507 | |
| 1508 | if (.not. associated(node%list)) then |
| 1509 | return |
| 1510 | end if |
| 1511 | |
| 1512 | ! For background jobs (&), handle specially - don't execute left side yet |
| 1513 | if (node%list%separator == LIST_SEP_BACKGROUND) then |
| 1514 | ! Special handling for left-associative parsing with semicolons |
| 1515 | ! For "a; b & c" which parses as "(a; b) & c", we need to: |
| 1516 | ! 1. Execute "a" in parent (synchronously) |
| 1517 | ! 2. Fork for "b" (background) |
| 1518 | ! 3. Execute "c" in parent |
| 1519 | if (associated(node%list%left)) then |
| 1520 | if (node%list%left%node_type == CMD_LIST) then |
| 1521 | if (associated(node%list%left%list)) then |
| 1522 | if (node%list%left%list%separator == LIST_SEP_SEQUENTIAL) then |
| 1523 | ! Execute the sequential commands before &, keeping the rightmost one for background |
| 1524 | ! Execute left part synchronously in parent |
| 1525 | if (associated(node%list%left%list%left)) then |
| 1526 | left_status = execute_ast_node(node%list%left%list%left, shell) |
| 1527 | end if |
| 1528 | ! Now fork only for the right part (the command immediately before &) |
| 1529 | if (associated(node%list%left%list%right)) then |
| 1530 | pid = c_fork() |
| 1531 | if (pid == 0) then |
| 1532 | shell%is_interactive = .false. |
| 1533 | shell%in_background = .true. |
| 1534 | status = execute_ast_node(node%list%left%list%right, shell) |
| 1535 | call c_exit(status) |
| 1536 | else if (pid > 0) then |
| 1537 | shell%last_bg_pid = pid |
| 1538 | ! Track job inline (duplicated code to avoid goto) |
| 1539 | if (.not. shell%in_background) then |
| 1540 | job_command = trim(shell%current_command) |
| 1541 | if (len_trim(job_command) == 0 .and. associated(node%list%left%list%right)) then |
| 1542 | if (node%list%left%list%right%node_type == CMD_SIMPLE) then |
| 1543 | if (associated(node%list%left%list%right%simple_cmd)) then |
| 1544 | if (node%list%left%list%right%simple_cmd%num_words > 0) then |
| 1545 | job_command = '' |
| 1546 | do i = 1, node%list%left%list%right%simple_cmd%num_words |
| 1547 | if (i > 1) then |
| 1548 | job_command = trim(job_command) // ' ' // trim(node%list%left%list%right%simple_cmd%words(i)) |
| 1549 | else |
| 1550 | job_command = trim(node%list%left%list%right%simple_cmd%words(i)) |
| 1551 | end if |
| 1552 | end do |
| 1553 | end if |
| 1554 | end if |
| 1555 | end if |
| 1556 | end if |
| 1557 | status = add_job(shell, pid, trim(job_command), .false.) |
| 1558 | if (shell%is_interactive) then |
| 1559 | write(output_unit, '(a,i0,a,i0)') '[', status, '] ', pid |
| 1560 | end if |
| 1561 | end if |
| 1562 | end if |
| 1563 | end if |
| 1564 | ! Continue with right side |
| 1565 | if (associated(node%list%right)) then |
| 1566 | exit_status = execute_ast_node(node%list%right, shell) |
| 1567 | else |
| 1568 | exit_status = 0 |
| 1569 | end if |
| 1570 | return |
| 1571 | end if |
| 1572 | end if |
| 1573 | end if |
| 1574 | end if |
| 1575 | |
| 1576 | ! Standard background handling (for non-sequential left sides) |
| 1577 | pid = c_fork() |
| 1578 | if (pid == 0) then |
| 1579 | ! Child process - execute left command and exit with its status |
| 1580 | ! Background jobs should not do terminal control or track sub-jobs |
| 1581 | shell%is_interactive = .false. |
| 1582 | shell%in_background = .true. |
| 1583 | ! Special case: if left side is itself a background list, execute only its left child |
| 1584 | ! This handles left-associative parsing: (a & b) & c should run a, not (a & b) |
| 1585 | if (associated(node%list%left)) then |
| 1586 | if (node%list%left%node_type == CMD_LIST) then |
| 1587 | if (associated(node%list%left%list)) then |
| 1588 | if (node%list%left%list%separator == LIST_SEP_BACKGROUND) then |
| 1589 | if (associated(node%list%left%list%left)) then |
| 1590 | status = execute_ast_node(node%list%left%list%left, shell) |
| 1591 | else |
| 1592 | status = 0 |
| 1593 | end if |
| 1594 | else |
| 1595 | status = execute_ast_node(node%list%left, shell) |
| 1596 | end if |
| 1597 | else |
| 1598 | status = 0 |
| 1599 | end if |
| 1600 | else |
| 1601 | status = execute_ast_node(node%list%left, shell) |
| 1602 | end if |
| 1603 | else |
| 1604 | status = 0 |
| 1605 | end if |
| 1606 | call c_exit(status) |
| 1607 | else if (pid > 0) then |
| 1608 | ! Parent - add to job list and continue with right |
| 1609 | shell%last_bg_pid = pid |
| 1610 | ! Only track jobs if we're not already in a background job child |
| 1611 | if (.not. shell%in_background) then |
| 1612 | ! Use the current command text for job display |
| 1613 | job_command = trim(shell%current_command) |
| 1614 | if (len_trim(job_command) == 0) job_command = '<background job>' |
| 1615 | |
| 1616 | status = add_job(shell, pid, trim(job_command), .false.) |
| 1617 | ! Only print job notification in interactive mode |
| 1618 | if (shell%is_interactive) then |
| 1619 | write(output_unit, '(a,i0,a,i0)') '[', status, '] ', pid |
| 1620 | end if |
| 1621 | end if |
| 1622 | |
| 1623 | ! Special case: if left side was a nested background list, fork for its right side too |
| 1624 | ! This handles left-associative parsing: (a & b) & c should fork for both a and b |
| 1625 | if (associated(node%list%left)) then |
| 1626 | if (node%list%left%node_type == CMD_LIST) then |
| 1627 | if (associated(node%list%left%list)) then |
| 1628 | if (node%list%left%list%separator == LIST_SEP_BACKGROUND) then |
| 1629 | if (associated(node%list%left%list%right)) then |
| 1630 | pid = c_fork() |
| 1631 | if (pid == 0) then |
| 1632 | ! Child for the nested right side |
| 1633 | shell%is_interactive = .false. |
| 1634 | shell%in_background = .true. |
| 1635 | left_status = execute_ast_node(node%list%left%list%right, shell) |
| 1636 | call c_exit(left_status) |
| 1637 | else if (pid > 0) then |
| 1638 | ! Parent adds this job too |
| 1639 | shell%last_bg_pid = pid |
| 1640 | if (.not. shell%in_background) then |
| 1641 | ! Reconstruct command string for the nested right side |
| 1642 | job_command2 = '<background job>' |
| 1643 | if (associated(node%list%left%list%right)) then |
| 1644 | if (node%list%left%list%right%node_type == CMD_SIMPLE) then |
| 1645 | if (associated(node%list%left%list%right%simple_cmd)) then |
| 1646 | if (node%list%left%list%right%simple_cmd%num_words > 0) then |
| 1647 | job_command2 = '' |
| 1648 | do j = 1, node%list%left%list%right%simple_cmd%num_words |
| 1649 | if (j > 1) then |
| 1650 | job_command2 = trim(job_command2) // ' ' // trim(node%list%left%list%right%simple_cmd%words(j)) |
| 1651 | else |
| 1652 | job_command2 = trim(node%list%left%list%right%simple_cmd%words(j)) |
| 1653 | end if |
| 1654 | end do |
| 1655 | end if |
| 1656 | end if |
| 1657 | end if |
| 1658 | end if |
| 1659 | |
| 1660 | status = add_job(shell, pid, trim(job_command2), .false.) |
| 1661 | if (shell%is_interactive) then |
| 1662 | write(output_unit, '(a,i0,a,i0)') '[', status, '] ', pid |
| 1663 | end if |
| 1664 | end if |
| 1665 | end if |
| 1666 | end if |
| 1667 | end if |
| 1668 | end if |
| 1669 | end if |
| 1670 | end if |
| 1671 | |
| 1672 | if (associated(node%list%right)) then |
| 1673 | exit_status = execute_ast_node(node%list%right, shell) |
| 1674 | else |
| 1675 | exit_status = 0 |
| 1676 | end if |
| 1677 | return |
| 1678 | else |
| 1679 | ! Fork failed |
| 1680 | exit_status = 1 |
| 1681 | return |
| 1682 | end if |
| 1683 | end if |
| 1684 | |
| 1685 | ! Execute left side (for all non-background separators) |
| 1686 | if (associated(node%list%left)) then |
| 1687 | ! POSIX: Suppress errexit during left side of AND-OR lists |
| 1688 | if (node%list%separator == LIST_SEP_AND .or. node%list%separator == LIST_SEP_OR) then |
| 1689 | shell%in_and_or_list = .true. |
| 1690 | end if |
| 1691 | left_status = execute_ast_node(node%list%left, shell) |
| 1692 | shell%in_and_or_list = .false. |
| 1693 | else |
| 1694 | left_status = 0 |
| 1695 | end if |
| 1696 | |
| 1697 | ! Errexit is checked at the simple command level instead |
| 1698 | |
| 1699 | ! Handle based on separator type |
| 1700 | select case(node%list%separator) |
| 1701 | case(LIST_SEP_SEQUENTIAL) |
| 1702 | ! ; - Execute right side unless shell is exiting |
| 1703 | ! But first, handle any sourcing queued by the left side (e.g., dot command) |
| 1704 | if (shell%should_source) then |
| 1705 | call process_source_inline_ast(shell) |
| 1706 | end if |
| 1707 | ! Check for break/continue - if requested, skip the right side |
| 1708 | if (shell%control_depth > 0) then |
| 1709 | if (shell%control_stack(shell%control_depth)%break_requested .or. & |
| 1710 | shell%control_stack(shell%control_depth)%continue_requested) then |
| 1711 | ! Don't execute right side - break or continue was called |
| 1712 | exit_status = left_status |
| 1713 | return |
| 1714 | end if |
| 1715 | end if |
| 1716 | ! Check for function return - if requested, skip the right side |
| 1717 | if (shell%function_return_pending) then |
| 1718 | exit_status = shell%function_return_value |
| 1719 | return |
| 1720 | end if |
| 1721 | ! Check if noexec was set - if so, skip right side (set -n behavior) |
| 1722 | if (shell%option_noexec .and. .not. shell%is_interactive) then |
| 1723 | exit_status = left_status |
| 1724 | return |
| 1725 | end if |
| 1726 | if (.not. shell%running) then |
| 1727 | ! Shell is exiting (e.g., exit builtin was called) |
| 1728 | exit_status = left_status |
| 1729 | else if (associated(node%list%right)) then |
| 1730 | exit_status = execute_ast_node(node%list%right, shell) |
| 1731 | else |
| 1732 | exit_status = left_status |
| 1733 | end if |
| 1734 | |
| 1735 | case(LIST_SEP_AND) |
| 1736 | ! && - Execute right only if left succeeded |
| 1737 | ! But first, handle any sourcing queued by the left side (e.g., dot command) |
| 1738 | if (shell%should_source) then |
| 1739 | call process_source_inline_ast(shell) |
| 1740 | left_status = shell%last_exit_status |
| 1741 | end if |
| 1742 | ! Check if noexec was set - if so, skip right side |
| 1743 | if (shell%option_noexec .and. .not. shell%is_interactive) then |
| 1744 | exit_status = left_status |
| 1745 | else if (left_status == 0) then |
| 1746 | if (associated(node%list%right)) then |
| 1747 | exit_status = execute_ast_node(node%list%right, shell) |
| 1748 | else |
| 1749 | exit_status = left_status |
| 1750 | end if |
| 1751 | else |
| 1752 | exit_status = left_status |
| 1753 | end if |
| 1754 | ! Mark that this result came from an AND-OR list (suppress errexit check) |
| 1755 | shell%last_from_and_or = .true. |
| 1756 | |
| 1757 | case(LIST_SEP_OR) |
| 1758 | ! || - Execute right only if left failed |
| 1759 | ! But first, handle any sourcing queued by the left side (e.g., dot command) |
| 1760 | if (shell%should_source) then |
| 1761 | call process_source_inline_ast(shell) |
| 1762 | left_status = shell%last_exit_status |
| 1763 | end if |
| 1764 | ! Check if noexec was set - if so, skip right side |
| 1765 | if (shell%option_noexec .and. .not. shell%is_interactive) then |
| 1766 | exit_status = left_status |
| 1767 | else if (left_status /= 0) then |
| 1768 | if (associated(node%list%right)) then |
| 1769 | exit_status = execute_ast_node(node%list%right, shell) |
| 1770 | else |
| 1771 | exit_status = left_status |
| 1772 | end if |
| 1773 | else |
| 1774 | exit_status = left_status |
| 1775 | end if |
| 1776 | ! Mark that this result came from an AND-OR list (suppress errexit check) |
| 1777 | shell%last_from_and_or = .true. |
| 1778 | |
| 1779 | case(LIST_SEP_BACKGROUND) |
| 1780 | ! & - Background jobs handled early in function (before left execution) |
| 1781 | exit_status = 0 |
| 1782 | |
| 1783 | case default |
| 1784 | exit_status = left_status |
| 1785 | end select |
| 1786 | |
| 1787 | end function execute_list_node |
| 1788 | |
| 1789 | ! ===================================== |
| 1790 | ! If Statement Execution |
| 1791 | ! ===================================== |
| 1792 | |
| 1793 | recursive function execute_if_node(node, shell) result(exit_status) |
| 1794 | use fd_redirection, only: apply_single_redirection, save_fd_mark, restore_fds_to_mark |
| 1795 | use parser, only: expand_variables |
| 1796 | type(command_node_t), pointer, intent(in) :: node |
| 1797 | type(shell_state_t), intent(inout) :: shell |
| 1798 | integer :: exit_status, cond_status, i, fd_mark |
| 1799 | type(redirection_t) :: temp_redirect |
| 1800 | logical :: redir_success, has_redirects |
| 1801 | |
| 1802 | exit_status = 0 |
| 1803 | |
| 1804 | if (.not. associated(node%if_stmt)) then |
| 1805 | return |
| 1806 | end if |
| 1807 | |
| 1808 | ! Apply redirections for the entire if statement |
| 1809 | has_redirects = (node%num_redirects > 0) |
| 1810 | fd_mark = save_fd_mark() |
| 1811 | if (has_redirects) then |
| 1812 | block |
| 1813 | character(len=:), allocatable :: expanded_filename |
| 1814 | do i = 1, node%num_redirects |
| 1815 | temp_redirect%type = node%redirects(i)%type |
| 1816 | temp_redirect%fd = node%redirects(i)%fd |
| 1817 | temp_redirect%target_fd = node%redirects(i)%target_fd |
| 1818 | if (allocated(node%redirects(i)%filename)) then |
| 1819 | call expand_variables(trim(node%redirects(i)%filename), expanded_filename, shell) |
| 1820 | if (allocated(expanded_filename)) then |
| 1821 | allocate(temp_redirect%filename, source=trim(expanded_filename)) |
| 1822 | deallocate(expanded_filename) |
| 1823 | else |
| 1824 | allocate(temp_redirect%filename, source=trim(node%redirects(i)%filename)) |
| 1825 | end if |
| 1826 | end if |
| 1827 | temp_redirect%force_clobber = node%redirects(i)%force_clobber |
| 1828 | |
| 1829 | call apply_single_redirection(temp_redirect, redir_success, shell%option_noclobber) |
| 1830 | if (allocated(temp_redirect%filename)) deallocate(temp_redirect%filename) |
| 1831 | if (.not. redir_success) then |
| 1832 | call restore_fds_to_mark(fd_mark) |
| 1833 | exit_status = 1 |
| 1834 | return |
| 1835 | end if |
| 1836 | end do |
| 1837 | end block |
| 1838 | end if |
| 1839 | |
| 1840 | ! Evaluate condition |
| 1841 | if (associated(node%if_stmt%condition)) then |
| 1842 | ! POSIX: Suppress errexit during condition evaluation |
| 1843 | shell%evaluating_condition = .true. |
| 1844 | cond_status = execute_ast_node(node%if_stmt%condition, shell) |
| 1845 | shell%evaluating_condition = .false. |
| 1846 | else |
| 1847 | cond_status = 1 |
| 1848 | end if |
| 1849 | |
| 1850 | ! Execute then or else part based on condition |
| 1851 | if (cond_status == 0) then |
| 1852 | ! Condition succeeded - execute then part |
| 1853 | if (associated(node%if_stmt%then_part)) then |
| 1854 | exit_status = execute_ast_node(node%if_stmt%then_part, shell) |
| 1855 | end if |
| 1856 | else |
| 1857 | ! Condition failed - execute else part if present |
| 1858 | if (associated(node%if_stmt%else_part)) then |
| 1859 | exit_status = execute_ast_node(node%if_stmt%else_part, shell) |
| 1860 | end if |
| 1861 | end if |
| 1862 | |
| 1863 | ! Restore file descriptors if we applied redirections |
| 1864 | if (has_redirects) then |
| 1865 | call restore_fds_to_mark(fd_mark) |
| 1866 | end if |
| 1867 | |
| 1868 | end function execute_if_node |
| 1869 | |
| 1870 | ! ===================================== |
| 1871 | ! While/Until Loop Execution |
| 1872 | ! ===================================== |
| 1873 | |
| 1874 | recursive function execute_while_node(node, shell) result(exit_status) |
| 1875 | use control_flow, only: push_control_block, pop_control_block, BLOCK_WHILE, BLOCK_UNTIL |
| 1876 | use fd_redirection, only: apply_single_redirection, save_fd_mark, restore_fds_to_mark |
| 1877 | use parser, only: expand_variables, read_heredoc |
| 1878 | type(command_node_t), pointer, intent(in) :: node |
| 1879 | type(shell_state_t), intent(inout) :: shell |
| 1880 | integer :: exit_status, cond_status, i, fd_mark |
| 1881 | logical :: should_continue |
| 1882 | type(redirection_t) :: temp_redirect |
| 1883 | logical :: redir_success, has_redirects |
| 1884 | |
| 1885 | exit_status = 0 |
| 1886 | |
| 1887 | if (.not. associated(node%while_loop)) then |
| 1888 | return |
| 1889 | end if |
| 1890 | |
| 1891 | ! Apply redirections for the entire while loop |
| 1892 | has_redirects = (node%num_redirects > 0) |
| 1893 | fd_mark = save_fd_mark() |
| 1894 | if (has_redirects) then |
| 1895 | block |
| 1896 | character(len=:), allocatable :: expanded_filename |
| 1897 | character(len=:), allocatable :: heredoc_content |
| 1898 | do i = 1, node%num_redirects |
| 1899 | temp_redirect%type = node%redirects(i)%type |
| 1900 | temp_redirect%fd = node%redirects(i)%fd |
| 1901 | temp_redirect%target_fd = node%redirects(i)%target_fd |
| 1902 | |
| 1903 | if (temp_redirect%type == REDIR_HERE_DOC) then |
| 1904 | ! Heredoc: filename holds delimiter, retrieve content |
| 1905 | if (allocated(node%redirects(i)%filename)) then |
| 1906 | call read_heredoc( & |
| 1907 | trim(node%redirects(i)%filename), & |
| 1908 | heredoc_content, shell) |
| 1909 | if (allocated(heredoc_content)) then |
| 1910 | allocate(temp_redirect%filename, & |
| 1911 | source=heredoc_content) |
| 1912 | deallocate(heredoc_content) |
| 1913 | else |
| 1914 | allocate(temp_redirect%filename, source='') |
| 1915 | end if |
| 1916 | end if |
| 1917 | else if (allocated(node%redirects(i)%filename)) then |
| 1918 | call expand_variables( & |
| 1919 | trim(node%redirects(i)%filename), & |
| 1920 | expanded_filename, shell) |
| 1921 | if (allocated(expanded_filename)) then |
| 1922 | allocate(temp_redirect%filename, & |
| 1923 | source=trim(expanded_filename)) |
| 1924 | deallocate(expanded_filename) |
| 1925 | else |
| 1926 | allocate(temp_redirect%filename, & |
| 1927 | source=trim(node%redirects(i)%filename)) |
| 1928 | end if |
| 1929 | end if |
| 1930 | temp_redirect%force_clobber = & |
| 1931 | node%redirects(i)%force_clobber |
| 1932 | |
| 1933 | call apply_single_redirection(temp_redirect, & |
| 1934 | redir_success, shell%option_noclobber) |
| 1935 | if (allocated(temp_redirect%filename)) & |
| 1936 | deallocate(temp_redirect%filename) |
| 1937 | if (.not. redir_success) then |
| 1938 | call restore_fds_to_mark(fd_mark) |
| 1939 | exit_status = 1 |
| 1940 | return |
| 1941 | end if |
| 1942 | end do |
| 1943 | end block |
| 1944 | end if |
| 1945 | |
| 1946 | ! Push loop control block so break/continue can find it |
| 1947 | if (node%while_loop%is_until) then |
| 1948 | call push_control_block(shell, BLOCK_UNTIL, .true.) |
| 1949 | else |
| 1950 | call push_control_block(shell, BLOCK_WHILE, .true.) |
| 1951 | end if |
| 1952 | |
| 1953 | do |
| 1954 | ! Evaluate condition (suppress errexit during condition evaluation per POSIX) |
| 1955 | if (associated(node%while_loop%condition)) then |
| 1956 | shell%evaluating_condition = .true. |
| 1957 | cond_status = execute_ast_node(node%while_loop%condition, shell) |
| 1958 | shell%evaluating_condition = .false. |
| 1959 | else |
| 1960 | cond_status = 1 |
| 1961 | end if |
| 1962 | |
| 1963 | ! Determine if we should continue based on while vs until |
| 1964 | if (node%while_loop%is_until) then |
| 1965 | should_continue = (cond_status /= 0) ! until: continue while false |
| 1966 | else |
| 1967 | should_continue = (cond_status == 0) ! while: continue while true |
| 1968 | end if |
| 1969 | |
| 1970 | if (.not. should_continue) exit |
| 1971 | |
| 1972 | ! Execute body |
| 1973 | if (associated(node%while_loop%body)) then |
| 1974 | exit_status = execute_ast_node(node%while_loop%body, shell) |
| 1975 | end if |
| 1976 | |
| 1977 | ! Check for break/continue from within the loop body |
| 1978 | if (shell%control_depth > 0) then |
| 1979 | if (shell%control_stack(shell%control_depth)%break_requested) then |
| 1980 | ! Handle multi-level break |
| 1981 | if (shell%control_stack(shell%control_depth)%break_level > 1) then |
| 1982 | ! Propagate to parent loop |
| 1983 | if (shell%control_depth > 1) then |
| 1984 | shell%control_stack(shell%control_depth - 1)%break_requested = .true. |
| 1985 | shell%control_stack(shell%control_depth - 1)%break_level = & |
| 1986 | shell%control_stack(shell%control_depth)%break_level - 1 |
| 1987 | end if |
| 1988 | end if |
| 1989 | ! Clear flag and exit loop |
| 1990 | shell%control_stack(shell%control_depth)%break_requested = .false. |
| 1991 | shell%control_stack(shell%control_depth)%break_level = 0 |
| 1992 | exit |
| 1993 | end if |
| 1994 | |
| 1995 | if (shell%control_stack(shell%control_depth)%continue_requested) then |
| 1996 | ! Handle multi-level continue |
| 1997 | if (shell%control_stack(shell%control_depth)%continue_level > 1) then |
| 1998 | ! Propagate to parent loop |
| 1999 | if (shell%control_depth > 1) then |
| 2000 | shell%control_stack(shell%control_depth - 1)%continue_requested = .true. |
| 2001 | shell%control_stack(shell%control_depth - 1)%continue_level = & |
| 2002 | shell%control_stack(shell%control_depth)%continue_level - 1 |
| 2003 | end if |
| 2004 | ! Clear and exit to outer loop |
| 2005 | shell%control_stack(shell%control_depth)%continue_requested = .false. |
| 2006 | shell%control_stack(shell%control_depth)%continue_level = 0 |
| 2007 | exit |
| 2008 | else |
| 2009 | ! Clear flag and continue to next iteration |
| 2010 | shell%control_stack(shell%control_depth)%continue_requested = .false. |
| 2011 | shell%control_stack(shell%control_depth)%continue_level = 0 |
| 2012 | ! Just continue the loop (next iteration) |
| 2013 | end if |
| 2014 | end if |
| 2015 | end if |
| 2016 | end do |
| 2017 | |
| 2018 | ! Pop loop control block |
| 2019 | call pop_control_block(shell) |
| 2020 | |
| 2021 | ! Restore file descriptors if we applied redirections |
| 2022 | if (has_redirects) then |
| 2023 | call restore_fds_to_mark(fd_mark) |
| 2024 | end if |
| 2025 | |
| 2026 | end function execute_while_node |
| 2027 | |
| 2028 | ! ===================================== |
| 2029 | ! For Loop Execution |
| 2030 | ! ===================================== |
| 2031 | |
| 2032 | recursive function execute_for_node(node, shell) result(exit_status) |
| 2033 | use variables, only: set_shell_variable, get_shell_variable |
| 2034 | use control_flow, only: push_control_block, pop_control_block, BLOCK_FOR |
| 2035 | use glob, only: glob_match, has_unescaped_glob_chars |
| 2036 | use parser, only: expand_variables |
| 2037 | use fd_redirection, only: apply_single_redirection, save_fd_mark, restore_fds_to_mark |
| 2038 | type(command_node_t), pointer, intent(in) :: node |
| 2039 | type(shell_state_t), intent(inout) :: shell |
| 2040 | integer :: exit_status, i, j, glob_count, word_idx, k, split_count, fd_mark |
| 2041 | integer, parameter :: MAX_GLOB = 256, MAX_SPLIT = 256 |
| 2042 | character(len=MAX_TOKEN_LEN), allocatable :: glob_matches(:) |
| 2043 | character(len=MAX_TOKEN_LEN), allocatable :: expanded_words(:) |
| 2044 | character(len=:), allocatable :: expanded_word, ifs_chars |
| 2045 | character(len=MAX_TOKEN_LEN), allocatable :: split_words(:) |
| 2046 | integer :: total_words |
| 2047 | type(redirection_t) :: temp_redirect |
| 2048 | logical :: redir_success, has_redirects |
| 2049 | |
| 2050 | exit_status = 0 |
| 2051 | |
| 2052 | if (.not. associated(node%for_loop)) then |
| 2053 | return |
| 2054 | end if |
| 2055 | |
| 2056 | ! Apply redirections for the entire for loop |
| 2057 | has_redirects = (node%num_redirects > 0) |
| 2058 | fd_mark = save_fd_mark() |
| 2059 | if (has_redirects) then |
| 2060 | block |
| 2061 | character(len=:), allocatable :: expanded_filename |
| 2062 | do i = 1, node%num_redirects |
| 2063 | temp_redirect%type = node%redirects(i)%type |
| 2064 | temp_redirect%fd = node%redirects(i)%fd |
| 2065 | temp_redirect%target_fd = node%redirects(i)%target_fd |
| 2066 | if (allocated(node%redirects(i)%filename)) then |
| 2067 | ! Expand variables in filename |
| 2068 | call expand_variables(trim(node%redirects(i)%filename), expanded_filename, shell) |
| 2069 | if (allocated(expanded_filename)) then |
| 2070 | allocate(temp_redirect%filename, source=trim(expanded_filename)) |
| 2071 | deallocate(expanded_filename) |
| 2072 | else |
| 2073 | allocate(temp_redirect%filename, source=trim(node%redirects(i)%filename)) |
| 2074 | end if |
| 2075 | end if |
| 2076 | temp_redirect%force_clobber = node%redirects(i)%force_clobber |
| 2077 | |
| 2078 | call apply_single_redirection(temp_redirect, redir_success, shell%option_noclobber) |
| 2079 | if (allocated(temp_redirect%filename)) deallocate(temp_redirect%filename) |
| 2080 | if (.not. redir_success) then |
| 2081 | call restore_fds_to_mark(fd_mark) |
| 2082 | exit_status = 1 |
| 2083 | return |
| 2084 | end if |
| 2085 | end do |
| 2086 | end block |
| 2087 | end if |
| 2088 | |
| 2089 | ! Get IFS for word splitting |
| 2090 | ! POSIX: Empty IFS (IFS="") means no field splitting |
| 2091 | ! Unset IFS means use default (space, tab, newline) |
| 2092 | if (shell%ifs_len == 0) then |
| 2093 | ! IFS is set but empty - no splitting will occur |
| 2094 | ifs_chars = '' |
| 2095 | else if (shell%ifs_len > 0) then |
| 2096 | ! IFS is set with content - use it |
| 2097 | ifs_chars = shell%ifs(1:shell%ifs_len) |
| 2098 | else |
| 2099 | ! Default IFS |
| 2100 | ifs_chars = ' ' // achar(9) // new_line('a') |
| 2101 | end if |
| 2102 | |
| 2103 | ! First, expand variables and split on IFS, then expand globs |
| 2104 | allocate(expanded_words(MAX_TOKEN_LEN), stat=i) |
| 2105 | if (i /= 0) then |
| 2106 | write(error_unit, '(A)') 'fortsh: for: allocation failure' |
| 2107 | exit_status = 1; return |
| 2108 | end if |
| 2109 | allocate(glob_matches(MAX_GLOB), stat=i) |
| 2110 | if (i /= 0) then |
| 2111 | write(error_unit, '(A)') 'fortsh: for: allocation failure' |
| 2112 | deallocate(expanded_words); exit_status = 1; return |
| 2113 | end if |
| 2114 | allocate(split_words(MAX_SPLIT), stat=i) |
| 2115 | if (i /= 0) then |
| 2116 | write(error_unit, '(A)') 'fortsh: for: allocation failure' |
| 2117 | deallocate(expanded_words); deallocate(glob_matches); exit_status = 1; return |
| 2118 | end if |
| 2119 | total_words = 0 |
| 2120 | |
| 2121 | ! POSIX: If 'in' is omitted (num_words == 0), iterate over positional parameters |
| 2122 | if (node%for_loop%num_words == 0) then |
| 2123 | do i = 1, shell%num_positional |
| 2124 | if (total_words < MAX_TOKEN_LEN) then |
| 2125 | total_words = total_words + 1 |
| 2126 | expanded_words(total_words) = shell%positional_params(i)%str |
| 2127 | end if |
| 2128 | end do |
| 2129 | else |
| 2130 | |
| 2131 | do i = 1, node%for_loop%num_words |
| 2132 | ! Special handling for quoted "$@" - each positional parameter becomes a separate word |
| 2133 | if (trim(node%for_loop%words(i)) == '$@' .and. & |
| 2134 | allocated(node%for_loop%words_was_quoted) .and. & |
| 2135 | node%for_loop%words_was_quoted(i)) then |
| 2136 | ! Quoted $@ - add each positional parameter as separate word without IFS splitting |
| 2137 | do j = 1, shell%num_positional |
| 2138 | if (total_words < MAX_TOKEN_LEN) then |
| 2139 | total_words = total_words + 1 |
| 2140 | expanded_words(total_words) = shell%positional_params(j)%str |
| 2141 | end if |
| 2142 | end do |
| 2143 | cycle ! Skip normal expansion for this word |
| 2144 | end if |
| 2145 | |
| 2146 | ! Special handling for quoted "${arr[@]}" - each array element becomes a separate word |
| 2147 | if (allocated(node%for_loop%words_was_quoted) .and. & |
| 2148 | i <= size(node%for_loop%words_was_quoted) .and. & |
| 2149 | node%for_loop%words_was_quoted(i)) then |
| 2150 | block |
| 2151 | use variables, only: get_array_size, & |
| 2152 | is_associative_array, get_assoc_array_keys, & |
| 2153 | get_assoc_array_value |
| 2154 | character(len=:), allocatable :: wrd |
| 2155 | character(len=256) :: arr_name |
| 2156 | character(len=256) :: akeys(200) |
| 2157 | integer :: nk, ai, bstart |
| 2158 | logical :: is_keys_expansion |
| 2159 | wrd = trim(node%for_loop%words(i)) |
| 2160 | is_keys_expansion = .false. |
| 2161 | ! Match ${name[@]} or ${!name[@]} pattern |
| 2162 | if (len(wrd) > 5 .and. wrd(1:2) == '${' & |
| 2163 | .and. wrd(len(wrd)-3:) == '[@]}') & |
| 2164 | then |
| 2165 | if (wrd(3:3) == '!' .or. & |
| 2166 | (len(wrd) > 6 .and. & |
| 2167 | wrd(3:4) == '\!')) then |
| 2168 | is_keys_expansion = .true. |
| 2169 | if (wrd(3:3) == '!') then |
| 2170 | arr_name = wrd(4:len(wrd)-4) |
| 2171 | else |
| 2172 | arr_name = wrd(5:len(wrd)-4) |
| 2173 | end if |
| 2174 | else |
| 2175 | arr_name = wrd(3:len(wrd)-4) |
| 2176 | end if |
| 2177 | if (is_keys_expansion) then |
| 2178 | ! ${!name[@]} - expand keys as separate words |
| 2179 | if (is_associative_array(shell, & |
| 2180 | trim(arr_name))) then |
| 2181 | call get_assoc_array_keys(shell, & |
| 2182 | trim(arr_name), akeys, nk) |
| 2183 | do ai = 1, nk |
| 2184 | if (total_words < MAX_TOKEN_LEN) then |
| 2185 | total_words = total_words + 1 |
| 2186 | expanded_words(total_words) = & |
| 2187 | akeys(ai) |
| 2188 | end if |
| 2189 | end do |
| 2190 | cycle |
| 2191 | else |
| 2192 | ! Regular array keys = indices |
| 2193 | nk = get_array_size(shell, & |
| 2194 | trim(arr_name)) |
| 2195 | do ai = 0, nk - 1 |
| 2196 | if (total_words < MAX_TOKEN_LEN) then |
| 2197 | block |
| 2198 | character(len=20) :: idx_str |
| 2199 | total_words = total_words + 1 |
| 2200 | write(idx_str, '(i0)') ai |
| 2201 | expanded_words(total_words) = & |
| 2202 | trim(idx_str) |
| 2203 | end block |
| 2204 | end if |
| 2205 | end do |
| 2206 | if (nk > 0) cycle |
| 2207 | end if |
| 2208 | else if (is_associative_array(shell, & |
| 2209 | trim(arr_name))) then |
| 2210 | call get_assoc_array_keys(shell, & |
| 2211 | trim(arr_name), akeys, nk) |
| 2212 | do ai = 1, nk |
| 2213 | if (total_words < MAX_TOKEN_LEN) then |
| 2214 | total_words = total_words + 1 |
| 2215 | expanded_words(total_words) = & |
| 2216 | get_assoc_array_value(shell, & |
| 2217 | trim(arr_name), trim(akeys(ai))) |
| 2218 | end if |
| 2219 | end do |
| 2220 | cycle |
| 2221 | else |
| 2222 | nk = get_array_size(shell, trim(arr_name)) |
| 2223 | if (nk > 0) then |
| 2224 | do ai = 1, shell%num_variables |
| 2225 | if (trim(shell%variables(ai)%name) & |
| 2226 | == trim(arr_name) .and. & |
| 2227 | shell%variables(ai)%is_array) then |
| 2228 | do bstart = 1, nk |
| 2229 | if (total_words < MAX_TOKEN_LEN & |
| 2230 | .and. allocated( & |
| 2231 | shell%variables(ai) & |
| 2232 | %array_values(bstart)%str) & |
| 2233 | .and. len_trim( & |
| 2234 | shell%variables(ai) & |
| 2235 | %array_values(bstart)%str) > 0) & |
| 2236 | then |
| 2237 | total_words = total_words + 1 |
| 2238 | expanded_words(total_words) = & |
| 2239 | shell%variables(ai) & |
| 2240 | %array_values(bstart)%str |
| 2241 | end if |
| 2242 | end do |
| 2243 | exit |
| 2244 | end if |
| 2245 | end do |
| 2246 | cycle |
| 2247 | end if |
| 2248 | end if |
| 2249 | end if |
| 2250 | end block |
| 2251 | end if |
| 2252 | |
| 2253 | ! First expand variables (e.g., $*, $@, $var) |
| 2254 | ! Pass the quoted status so expand_variables can handle it correctly |
| 2255 | if (allocated(node%for_loop%words_was_quoted) .and. i <= size(node%for_loop%words_was_quoted)) then |
| 2256 | call expand_variables(trim(node%for_loop%words(i)), expanded_word, shell, & |
| 2257 | was_quoted_in=node%for_loop%words_was_quoted(i)) |
| 2258 | else |
| 2259 | call expand_variables(trim(node%for_loop%words(i)), expanded_word, shell, was_quoted_in=.false.) |
| 2260 | end if |
| 2261 | |
| 2262 | ! Split the expanded word on IFS characters ONLY if: |
| 2263 | ! 1. It was NOT originally quoted, AND |
| 2264 | ! 2. It contained a parameter expansion ($ or backtick) |
| 2265 | ! POSIX: Field splitting only occurs on results of expansions, not literal text |
| 2266 | if (allocated(node%for_loop%words_was_quoted) .and. i <= size(node%for_loop%words_was_quoted) .and. & |
| 2267 | node%for_loop%words_was_quoted(i)) then |
| 2268 | ! Word was quoted - do not split, treat as single word |
| 2269 | split_words(1) = trim(expanded_word) |
| 2270 | split_count = 1 |
| 2271 | else if (index(node%for_loop%words(i), '$') > 0 .or. & |
| 2272 | index(node%for_loop%words(i), '`') > 0) then |
| 2273 | ! Word contained expansion - split on IFS |
| 2274 | call split_on_ifs(trim(expanded_word), ifs_chars, split_words, split_count) |
| 2275 | else if (index(node%for_loop%words(i), '{') > 0 .and. & |
| 2276 | index(node%for_loop%words(i), '}') > 0 .and. & |
| 2277 | allocated(expanded_word) .and. len(expanded_word) > len_trim(node%for_loop%words(i))) then |
| 2278 | ! Brace expansion produced multiple words - split on spaces |
| 2279 | call split_on_ifs(trim(expanded_word), ' ', split_words, split_count) |
| 2280 | else |
| 2281 | ! Literal word (no expansion) - do not split on IFS |
| 2282 | split_words(1) = trim(expanded_word) |
| 2283 | split_count = 1 |
| 2284 | end if |
| 2285 | |
| 2286 | ! Now process each split word for globs |
| 2287 | do k = 1, split_count |
| 2288 | ! Only expand globs if noglob option is NOT set (POSIX: set -f disables glob) |
| 2289 | if (.not. shell%option_noglob .and. has_unescaped_glob_chars(trim(split_words(k)))) then |
| 2290 | ! Expand the glob pattern |
| 2291 | call glob_match(trim(split_words(k)), glob_matches, glob_count) |
| 2292 | if (glob_count > 0) then |
| 2293 | ! Add all matched files |
| 2294 | do j = 1, glob_count |
| 2295 | if (total_words < MAX_TOKEN_LEN) then |
| 2296 | total_words = total_words + 1 |
| 2297 | expanded_words(total_words) = glob_matches(j) |
| 2298 | end if |
| 2299 | end do |
| 2300 | else |
| 2301 | ! No matches - use the pattern literally |
| 2302 | if (total_words < MAX_TOKEN_LEN) then |
| 2303 | total_words = total_words + 1 |
| 2304 | expanded_words(total_words) = split_words(k) |
| 2305 | end if |
| 2306 | end if |
| 2307 | else |
| 2308 | ! Not a glob pattern - use the word as-is |
| 2309 | if (total_words < MAX_TOKEN_LEN) then |
| 2310 | total_words = total_words + 1 |
| 2311 | expanded_words(total_words) = split_words(k) |
| 2312 | end if |
| 2313 | end if |
| 2314 | end do |
| 2315 | end do |
| 2316 | end if ! End of else branch for num_words > 0 |
| 2317 | |
| 2318 | ! Push loop control block so break/continue can find it |
| 2319 | call push_control_block(shell, BLOCK_FOR, .true.) |
| 2320 | |
| 2321 | ! Iterate over expanded words |
| 2322 | do word_idx = 1, total_words |
| 2323 | ! Set loop variable |
| 2324 | call set_shell_variable(shell, trim(node%for_loop%variable), trim(expanded_words(word_idx)), & |
| 2325 | len_trim(expanded_words(word_idx))) |
| 2326 | |
| 2327 | ! Execute body |
| 2328 | if (associated(node%for_loop%body)) then |
| 2329 | exit_status = execute_ast_node(node%for_loop%body, shell) |
| 2330 | end if |
| 2331 | |
| 2332 | ! Check for break/continue from within the loop body |
| 2333 | if (shell%control_depth > 0) then |
| 2334 | if (shell%control_stack(shell%control_depth)%break_requested) then |
| 2335 | ! Handle multi-level break |
| 2336 | if (shell%control_stack(shell%control_depth)%break_level > 1) then |
| 2337 | ! Propagate to parent loop |
| 2338 | if (shell%control_depth > 1) then |
| 2339 | shell%control_stack(shell%control_depth - 1)%break_requested = .true. |
| 2340 | shell%control_stack(shell%control_depth - 1)%break_level = & |
| 2341 | shell%control_stack(shell%control_depth)%break_level - 1 |
| 2342 | end if |
| 2343 | end if |
| 2344 | ! Clear flag and exit loop |
| 2345 | shell%control_stack(shell%control_depth)%break_requested = .false. |
| 2346 | shell%control_stack(shell%control_depth)%break_level = 0 |
| 2347 | exit |
| 2348 | end if |
| 2349 | |
| 2350 | if (shell%control_stack(shell%control_depth)%continue_requested) then |
| 2351 | ! Handle multi-level continue |
| 2352 | if (shell%control_stack(shell%control_depth)%continue_level > 1) then |
| 2353 | ! Propagate to parent loop |
| 2354 | if (shell%control_depth > 1) then |
| 2355 | shell%control_stack(shell%control_depth - 1)%continue_requested = .true. |
| 2356 | shell%control_stack(shell%control_depth - 1)%continue_level = & |
| 2357 | shell%control_stack(shell%control_depth)%continue_level - 1 |
| 2358 | end if |
| 2359 | ! Clear and exit to outer loop |
| 2360 | shell%control_stack(shell%control_depth)%continue_requested = .false. |
| 2361 | shell%control_stack(shell%control_depth)%continue_level = 0 |
| 2362 | exit |
| 2363 | else |
| 2364 | ! Clear flag and continue to next iteration |
| 2365 | shell%control_stack(shell%control_depth)%continue_requested = .false. |
| 2366 | shell%control_stack(shell%control_depth)%continue_level = 0 |
| 2367 | ! Just continue the loop (next iteration) |
| 2368 | end if |
| 2369 | end if |
| 2370 | end if |
| 2371 | end do |
| 2372 | |
| 2373 | ! Pop loop control block |
| 2374 | call pop_control_block(shell) |
| 2375 | |
| 2376 | ! Clean up |
| 2377 | if (allocated(expanded_words)) deallocate(expanded_words) |
| 2378 | if (allocated(glob_matches)) deallocate(glob_matches) |
| 2379 | if (allocated(split_words)) deallocate(split_words) |
| 2380 | |
| 2381 | ! Restore file descriptors if we applied redirections |
| 2382 | if (has_redirects) then |
| 2383 | call restore_fds_to_mark(fd_mark) |
| 2384 | end if |
| 2385 | |
| 2386 | end function execute_for_node |
| 2387 | |
| 2388 | ! ===================================== |
| 2389 | ! C-Style Arithmetic For Loop Execution |
| 2390 | ! ===================================== |
| 2391 | |
| 2392 | function execute_for_arith_node(node, shell) result(exit_status) |
| 2393 | use expansion, only: arithmetic_expansion_shell |
| 2394 | use control_flow, only: push_control_block, pop_control_block, BLOCK_FOR |
| 2395 | type(command_node_t), pointer, intent(in) :: node |
| 2396 | type(shell_state_t), intent(inout) :: shell |
| 2397 | integer :: exit_status |
| 2398 | character(len=32) :: arith_result |
| 2399 | character(len=MAX_TOKEN_LEN) :: wrapped_expr |
| 2400 | integer(kind=8) :: cond_value |
| 2401 | integer :: io_stat |
| 2402 | |
| 2403 | exit_status = 0 |
| 2404 | if (.not. associated(node%for_arith)) return |
| 2405 | |
| 2406 | ! Evaluate init expression |
| 2407 | if (len_trim(node%for_arith%init_expr) > 0) then |
| 2408 | wrapped_expr = '$((' // trim(node%for_arith%init_expr) // '))' |
| 2409 | arith_result = arithmetic_expansion_shell(trim(wrapped_expr), shell) |
| 2410 | end if |
| 2411 | |
| 2412 | ! Push loop control block for break/continue support |
| 2413 | call push_control_block(shell, BLOCK_FOR, .true.) |
| 2414 | |
| 2415 | ! Loop: evaluate condition, execute body, evaluate increment |
| 2416 | do |
| 2417 | ! Evaluate condition (empty condition = infinite loop, like C) |
| 2418 | if (len_trim(node%for_arith%cond_expr) > 0) then |
| 2419 | wrapped_expr = '$((' // trim(node%for_arith%cond_expr) // '))' |
| 2420 | arith_result = arithmetic_expansion_shell(trim(wrapped_expr), shell) |
| 2421 | read(arith_result, *, iostat=io_stat) cond_value |
| 2422 | if (io_stat /= 0) cond_value = 0 |
| 2423 | if (cond_value == 0) exit |
| 2424 | end if |
| 2425 | |
| 2426 | ! Execute body |
| 2427 | if (associated(node%for_arith%body)) then |
| 2428 | exit_status = execute_ast_node(node%for_arith%body, shell) |
| 2429 | end if |
| 2430 | |
| 2431 | ! Check for break/continue (same pattern as while loop) |
| 2432 | if (shell%control_depth > 0) then |
| 2433 | if (shell%control_stack(shell%control_depth)%break_requested) then |
| 2434 | if (shell%control_stack(shell%control_depth)%break_level > 1) then |
| 2435 | if (shell%control_depth > 1) then |
| 2436 | shell%control_stack(shell%control_depth - 1)%break_requested = .true. |
| 2437 | shell%control_stack(shell%control_depth - 1)%break_level = & |
| 2438 | shell%control_stack(shell%control_depth)%break_level - 1 |
| 2439 | end if |
| 2440 | end if |
| 2441 | shell%control_stack(shell%control_depth)%break_requested = .false. |
| 2442 | shell%control_stack(shell%control_depth)%break_level = 0 |
| 2443 | exit |
| 2444 | end if |
| 2445 | |
| 2446 | if (shell%control_stack(shell%control_depth)%continue_requested) then |
| 2447 | if (shell%control_stack(shell%control_depth)%continue_level > 1) then |
| 2448 | if (shell%control_depth > 1) then |
| 2449 | shell%control_stack(shell%control_depth - 1)%continue_requested = .true. |
| 2450 | shell%control_stack(shell%control_depth - 1)%continue_level = & |
| 2451 | shell%control_stack(shell%control_depth)%continue_level - 1 |
| 2452 | end if |
| 2453 | shell%control_stack(shell%control_depth)%continue_requested = .false. |
| 2454 | shell%control_stack(shell%control_depth)%continue_level = 0 |
| 2455 | exit |
| 2456 | else |
| 2457 | shell%control_stack(shell%control_depth)%continue_requested = .false. |
| 2458 | shell%control_stack(shell%control_depth)%continue_level = 0 |
| 2459 | end if |
| 2460 | end if |
| 2461 | end if |
| 2462 | |
| 2463 | ! Evaluate increment expression |
| 2464 | if (len_trim(node%for_arith%incr_expr) > 0) then |
| 2465 | wrapped_expr = '$((' // trim(node%for_arith%incr_expr) // '))' |
| 2466 | arith_result = arithmetic_expansion_shell(trim(wrapped_expr), shell) |
| 2467 | end if |
| 2468 | end do |
| 2469 | |
| 2470 | call pop_control_block(shell) |
| 2471 | end function execute_for_arith_node |
| 2472 | |
| 2473 | ! ===================================== |
| 2474 | ! Coproc Execution |
| 2475 | ! ===================================== |
| 2476 | |
| 2477 | function execute_coproc_node(node, shell) result(exit_status) |
| 2478 | use coprocess, only: coprocs |
| 2479 | use variables, only: set_array_element, set_shell_variable |
| 2480 | type(command_node_t), pointer, intent(in) :: node |
| 2481 | type(shell_state_t), intent(inout) :: shell |
| 2482 | integer :: exit_status |
| 2483 | |
| 2484 | integer(c_int), target :: pipe_to_child(2), pipe_from_child(2) |
| 2485 | integer(c_pid_t) :: pid |
| 2486 | integer(c_int) :: ret |
| 2487 | integer :: coproc_id, status, i |
| 2488 | character(len=256) :: coproc_name |
| 2489 | character(len=16) :: fd_str, pid_str |
| 2490 | |
| 2491 | exit_status = 0 |
| 2492 | if (.not. associated(node%coproc)) return |
| 2493 | |
| 2494 | coproc_name = trim(node%coproc%name) |
| 2495 | |
| 2496 | ! Find available coprocess slot |
| 2497 | coproc_id = -1 |
| 2498 | do i = 1, size(coprocs) |
| 2499 | if (.not. coprocs(i)%active) then |
| 2500 | coproc_id = i |
| 2501 | exit |
| 2502 | end if |
| 2503 | end do |
| 2504 | |
| 2505 | if (coproc_id == -1) then |
| 2506 | write(error_unit, '(a)') 'coproc: maximum number of coprocesses reached' |
| 2507 | exit_status = 1 |
| 2508 | return |
| 2509 | end if |
| 2510 | |
| 2511 | ! Create pipes: parent writes to child stdin, reads from child stdout |
| 2512 | if (c_pipe(c_loc(pipe_to_child)) /= 0) then |
| 2513 | write(error_unit, '(a)') 'coproc: pipe creation failed' |
| 2514 | exit_status = 1 |
| 2515 | return |
| 2516 | end if |
| 2517 | |
| 2518 | if (c_pipe(c_loc(pipe_from_child)) /= 0) then |
| 2519 | write(error_unit, '(a)') 'coproc: pipe creation failed' |
| 2520 | ret = close(pipe_to_child(1)) |
| 2521 | ret = close(pipe_to_child(2)) |
| 2522 | exit_status = 1 |
| 2523 | return |
| 2524 | end if |
| 2525 | |
| 2526 | ! Flush before fork |
| 2527 | flush(output_unit) |
| 2528 | flush(error_unit) |
| 2529 | |
| 2530 | pid = c_fork() |
| 2531 | |
| 2532 | if (pid == 0) then |
| 2533 | ! Child: redirect stdin from pipe, stdout to pipe |
| 2534 | ret = c_dup2(pipe_to_child(1), int(0, c_int)) ! stdin = read end of to_child |
| 2535 | ret = close(pipe_to_child(1)) |
| 2536 | ret = close(pipe_to_child(2)) ! close write end |
| 2537 | |
| 2538 | ret = c_dup2(pipe_from_child(2), int(1, c_int)) ! stdout = write end of from_child |
| 2539 | ret = close(pipe_from_child(1)) |
| 2540 | ret = close(pipe_from_child(2)) ! close read end |
| 2541 | |
| 2542 | ! Execute the command body in the child |
| 2543 | if (associated(node%coproc%command)) then |
| 2544 | status = execute_ast_node(node%coproc%command, shell) |
| 2545 | else |
| 2546 | status = 0 |
| 2547 | end if |
| 2548 | call c_exit(status) |
| 2549 | |
| 2550 | else if (pid > 0) then |
| 2551 | ! Parent: close child ends of pipes |
| 2552 | ret = close(pipe_to_child(1)) ! close read end (child's stdin source) |
| 2553 | ret = close(pipe_from_child(2)) ! close write end (child's stdout dest) |
| 2554 | |
| 2555 | ! Register in coprocess table |
| 2556 | coprocs(coproc_id)%name = coproc_name |
| 2557 | coprocs(coproc_id)%command = 'coproc' |
| 2558 | coprocs(coproc_id)%pid = pid |
| 2559 | coprocs(coproc_id)%write_fd = pipe_to_child(2) ! parent writes here |
| 2560 | coprocs(coproc_id)%read_fd = pipe_from_child(1) ! parent reads here |
| 2561 | coprocs(coproc_id)%active = .true. |
| 2562 | coprocs(coproc_id)%eof_reached = .false. |
| 2563 | |
| 2564 | ! Set NAME_PID variable |
| 2565 | write(pid_str, '(I0)') pid |
| 2566 | call set_shell_variable(shell, trim(coproc_name) // '_PID', trim(pid_str)) |
| 2567 | |
| 2568 | ! Set NAME[0] = read_fd, NAME[1] = write_fd (bash convention) |
| 2569 | write(fd_str, '(I0)') pipe_from_child(1) |
| 2570 | call set_array_element(shell, trim(coproc_name), 1, trim(fd_str)) ! bash [0] |
| 2571 | write(fd_str, '(I0)') pipe_to_child(2) |
| 2572 | call set_array_element(shell, trim(coproc_name), 2, trim(fd_str)) ! bash [1] |
| 2573 | |
| 2574 | if (shell%is_interactive) then |
| 2575 | write(error_unit, '(a,a,a,I0)') '[', trim(coproc_name), '] ', pid |
| 2576 | end if |
| 2577 | |
| 2578 | exit_status = 0 |
| 2579 | else |
| 2580 | ! Fork failed |
| 2581 | write(error_unit, '(a)') 'coproc: fork failed' |
| 2582 | ret = close(pipe_to_child(1)) |
| 2583 | ret = close(pipe_to_child(2)) |
| 2584 | ret = close(pipe_from_child(1)) |
| 2585 | ret = close(pipe_from_child(2)) |
| 2586 | exit_status = 1 |
| 2587 | end if |
| 2588 | end function execute_coproc_node |
| 2589 | |
| 2590 | ! ===================================== |
| 2591 | ! Case Statement Execution |
| 2592 | ! ===================================== |
| 2593 | |
| 2594 | function execute_case_node(node, shell) result(exit_status) |
| 2595 | use variables, only: get_shell_variable |
| 2596 | use parser, only: expand_variables |
| 2597 | use fd_redirection, only: apply_single_redirection, save_fd_mark, restore_fds_to_mark |
| 2598 | type(command_node_t), pointer, intent(in) :: node |
| 2599 | type(shell_state_t), intent(inout) :: shell |
| 2600 | integer :: exit_status, i, k, fd_mark |
| 2601 | character(len=MAX_TOKEN_LEN) :: case_value |
| 2602 | integer :: case_value_len |
| 2603 | integer :: item_idx, pattern_idx |
| 2604 | logical :: matched, needs_expansion |
| 2605 | character(len=MAX_TOKEN_LEN) :: pattern |
| 2606 | character(len=:), allocatable :: expanded_pattern |
| 2607 | type(redirection_t) :: temp_redirect |
| 2608 | logical :: redir_success, has_redirects |
| 2609 | |
| 2610 | exit_status = 0 |
| 2611 | |
| 2612 | if (.not. associated(node%case_stmt)) then |
| 2613 | return |
| 2614 | end if |
| 2615 | |
| 2616 | ! Apply redirections for the entire case statement |
| 2617 | has_redirects = (node%num_redirects > 0) |
| 2618 | fd_mark = save_fd_mark() |
| 2619 | if (has_redirects) then |
| 2620 | block |
| 2621 | character(len=:), allocatable :: expanded_filename |
| 2622 | do i = 1, node%num_redirects |
| 2623 | temp_redirect%type = node%redirects(i)%type |
| 2624 | temp_redirect%fd = node%redirects(i)%fd |
| 2625 | temp_redirect%target_fd = node%redirects(i)%target_fd |
| 2626 | if (allocated(node%redirects(i)%filename)) then |
| 2627 | call expand_variables(trim(node%redirects(i)%filename), expanded_filename, shell) |
| 2628 | if (allocated(expanded_filename)) then |
| 2629 | allocate(temp_redirect%filename, source=trim(expanded_filename)) |
| 2630 | deallocate(expanded_filename) |
| 2631 | else |
| 2632 | allocate(temp_redirect%filename, source=trim(node%redirects(i)%filename)) |
| 2633 | end if |
| 2634 | end if |
| 2635 | temp_redirect%force_clobber = node%redirects(i)%force_clobber |
| 2636 | |
| 2637 | call apply_single_redirection(temp_redirect, redir_success, shell%option_noclobber) |
| 2638 | if (allocated(temp_redirect%filename)) deallocate(temp_redirect%filename) |
| 2639 | if (.not. redir_success) then |
| 2640 | call restore_fds_to_mark(fd_mark) |
| 2641 | exit_status = 1 |
| 2642 | return |
| 2643 | end if |
| 2644 | end do |
| 2645 | end block |
| 2646 | end if |
| 2647 | |
| 2648 | ! Get the value to match (expand variables, command substitution, etc.) |
| 2649 | ! Use word_len to preserve whitespace-only values that len_trim would destroy |
| 2650 | case_value_len = node%case_stmt%word_len |
| 2651 | if (case_value_len == 0) case_value_len = len_trim(node%case_stmt%word) |
| 2652 | |
| 2653 | ! Check if expansion is needed (contains $, `, or quotes) |
| 2654 | needs_expansion = .false. |
| 2655 | do k = 1, case_value_len |
| 2656 | if (node%case_stmt%word(k:k) == '$' .or. & |
| 2657 | node%case_stmt%word(k:k) == '`' .or. & |
| 2658 | node%case_stmt%word(k:k) == char(1) .or. & |
| 2659 | node%case_stmt%word(k:k) == char(2)) then |
| 2660 | needs_expansion = .true. |
| 2661 | exit |
| 2662 | end if |
| 2663 | end do |
| 2664 | |
| 2665 | if (needs_expansion) then |
| 2666 | block |
| 2667 | character(len=:), allocatable :: expanded_case_value |
| 2668 | call expand_variables(node%case_stmt%word(1:case_value_len), & |
| 2669 | expanded_case_value, shell) |
| 2670 | if (allocated(expanded_case_value)) then |
| 2671 | case_value_len = len(expanded_case_value) |
| 2672 | case_value = '' |
| 2673 | if (case_value_len > 0) case_value(1:case_value_len) = expanded_case_value |
| 2674 | deallocate(expanded_case_value) |
| 2675 | else |
| 2676 | case_value = '' |
| 2677 | case_value_len = 0 |
| 2678 | end if |
| 2679 | end block |
| 2680 | else |
| 2681 | case_value = '' |
| 2682 | if (case_value_len > 0) case_value(1:case_value_len) = & |
| 2683 | node%case_stmt%word(1:case_value_len) |
| 2684 | end if |
| 2685 | |
| 2686 | ! Try to match against each case item |
| 2687 | do item_idx = 1, node%case_stmt%num_items |
| 2688 | matched = .false. |
| 2689 | |
| 2690 | ! Check each pattern in this item |
| 2691 | do pattern_idx = 1, node%case_stmt%items(item_idx)%num_patterns |
| 2692 | pattern = trim(node%case_stmt%items(item_idx)%patterns(pattern_idx)) |
| 2693 | |
| 2694 | ! Expand variables in pattern (e.g., $P) |
| 2695 | call expand_variables(pattern, expanded_pattern, shell, was_quoted_in=.false.) |
| 2696 | |
| 2697 | ! Match pattern using glob module (handles *, ?, [abc], [[:class:]], etc.) |
| 2698 | if (case_value_len > 0) then |
| 2699 | matched = pattern_matches_no_dotfile_check(trim(expanded_pattern), & |
| 2700 | case_value(1:case_value_len)) |
| 2701 | else |
| 2702 | matched = pattern_matches_no_dotfile_check(trim(expanded_pattern), '') |
| 2703 | end if |
| 2704 | |
| 2705 | if (matched) exit |
| 2706 | end do |
| 2707 | |
| 2708 | ! If matched, execute the commands for this case item |
| 2709 | if (matched) then |
| 2710 | if (associated(node%case_stmt%items(item_idx)%commands)) then |
| 2711 | exit_status = execute_ast_node(node%case_stmt%items(item_idx)%commands, shell) |
| 2712 | else |
| 2713 | exit_status = 0 |
| 2714 | end if |
| 2715 | exit ! Only execute first match |
| 2716 | end if |
| 2717 | end do |
| 2718 | |
| 2719 | ! Restore file descriptors if we applied redirections |
| 2720 | if (has_redirects) then |
| 2721 | call restore_fds_to_mark(fd_mark) |
| 2722 | end if |
| 2723 | |
| 2724 | end function execute_case_node |
| 2725 | |
| 2726 | ! ===================================== |
| 2727 | ! Subshell Execution |
| 2728 | ! ===================================== |
| 2729 | |
| 2730 | recursive function execute_subshell_node(node, shell) result(exit_status) |
| 2731 | use fd_redirection, only: apply_single_redirection |
| 2732 | use parser, only: expand_variables |
| 2733 | type(command_node_t), pointer, intent(in) :: node |
| 2734 | type(shell_state_t), intent(inout) :: shell |
| 2735 | integer :: exit_status |
| 2736 | integer(c_pid_t) :: pid |
| 2737 | integer :: status, i |
| 2738 | type(redirection_t) :: temp_redirect |
| 2739 | logical :: redir_success |
| 2740 | |
| 2741 | exit_status = 0 |
| 2742 | |
| 2743 | if (.not. associated(node%subshell)) then |
| 2744 | return |
| 2745 | end if |
| 2746 | |
| 2747 | ! Fork for subshell |
| 2748 | pid = c_fork() |
| 2749 | if (pid == 0) then |
| 2750 | ! Child process - execute commands in subshell |
| 2751 | ! POSIX: Only ignored traps (empty action) are visible in subshells |
| 2752 | ! Remove traps with commands, but keep traps with empty actions (ignore) |
| 2753 | call filter_traps_for_subshell(shell) |
| 2754 | |
| 2755 | ! Apply redirections in child process |
| 2756 | if (node%num_redirects > 0) then |
| 2757 | block |
| 2758 | character(len=:), allocatable :: expanded_filename |
| 2759 | do i = 1, node%num_redirects |
| 2760 | temp_redirect%type = node%redirects(i)%type |
| 2761 | temp_redirect%fd = node%redirects(i)%fd |
| 2762 | temp_redirect%target_fd = node%redirects(i)%target_fd |
| 2763 | if (allocated(node%redirects(i)%filename)) then |
| 2764 | call expand_variables(trim(node%redirects(i)%filename), expanded_filename, shell) |
| 2765 | if (allocated(expanded_filename)) then |
| 2766 | allocate(temp_redirect%filename, source=trim(expanded_filename)) |
| 2767 | deallocate(expanded_filename) |
| 2768 | else |
| 2769 | allocate(temp_redirect%filename, source=trim(node%redirects(i)%filename)) |
| 2770 | end if |
| 2771 | end if |
| 2772 | temp_redirect%force_clobber = node%redirects(i)%force_clobber |
| 2773 | |
| 2774 | call apply_single_redirection(temp_redirect, redir_success, shell%option_noclobber) |
| 2775 | if (allocated(temp_redirect%filename)) deallocate(temp_redirect%filename) |
| 2776 | if (.not. redir_success) then |
| 2777 | call c_exit(1) |
| 2778 | end if |
| 2779 | end do |
| 2780 | end block |
| 2781 | end if |
| 2782 | |
| 2783 | status = execute_ast_node(node%subshell, shell) |
| 2784 | ! bash: expansion errors in subshells exit with 1, not 127 |
| 2785 | if (shell%fatal_expansion_error .and. status == 127) then |
| 2786 | status = 1 |
| 2787 | end if |
| 2788 | ! Fire EXIT trap before subshell exits |
| 2789 | shell%last_exit_status = status |
| 2790 | call run_exit_trap_in_subshell(shell) |
| 2791 | call c_exit(status) |
| 2792 | else if (pid > 0) then |
| 2793 | ! Parent - wait for subshell |
| 2794 | status = wait_for_process(pid) |
| 2795 | exit_status = extract_exit_status(status) |
| 2796 | else |
| 2797 | write(error_unit, '(A)') 'fortsh: fork failed for subshell' |
| 2798 | exit_status = 1 |
| 2799 | end if |
| 2800 | |
| 2801 | end function execute_subshell_node |
| 2802 | |
| 2803 | ! ===================================== |
| 2804 | ! Brace Group Execution |
| 2805 | ! ===================================== |
| 2806 | |
| 2807 | recursive function execute_brace_group_node(node, shell) result(exit_status) |
| 2808 | use fd_redirection, only: apply_single_redirection, save_fd_mark, restore_fds_to_mark |
| 2809 | use parser, only: expand_variables |
| 2810 | type(command_node_t), pointer, intent(in) :: node |
| 2811 | type(shell_state_t), intent(inout) :: shell |
| 2812 | integer :: exit_status |
| 2813 | integer :: i, fd_mark |
| 2814 | type(redirection_t) :: temp_redirect |
| 2815 | logical :: redir_success |
| 2816 | character(len=:), allocatable :: expanded_filename |
| 2817 | |
| 2818 | exit_status = 0 |
| 2819 | |
| 2820 | if (.not. associated(node%subshell)) then |
| 2821 | return |
| 2822 | end if |
| 2823 | |
| 2824 | ! Apply redirections if present |
| 2825 | fd_mark = save_fd_mark() |
| 2826 | if (node%num_redirects > 0) then |
| 2827 | do i = 1, node%num_redirects |
| 2828 | temp_redirect%type = node%redirects(i)%type |
| 2829 | temp_redirect%fd = node%redirects(i)%fd |
| 2830 | temp_redirect%target_fd = node%redirects(i)%target_fd |
| 2831 | if (allocated(node%redirects(i)%filename)) then |
| 2832 | ! Expand variables in redirect filename (e.g., $$ becomes PID) |
| 2833 | call expand_variables(trim(node%redirects(i)%filename), expanded_filename, shell) |
| 2834 | if (allocated(expanded_filename)) then |
| 2835 | allocate(temp_redirect%filename, source=trim(expanded_filename)) |
| 2836 | deallocate(expanded_filename) |
| 2837 | else |
| 2838 | allocate(temp_redirect%filename, source=trim(node%redirects(i)%filename)) |
| 2839 | end if |
| 2840 | end if |
| 2841 | temp_redirect%force_clobber = node%redirects(i)%force_clobber |
| 2842 | |
| 2843 | call apply_single_redirection(temp_redirect, redir_success, shell%option_noclobber) |
| 2844 | if (allocated(temp_redirect%filename)) deallocate(temp_redirect%filename) |
| 2845 | if (.not. redir_success) then |
| 2846 | exit_status = 1 |
| 2847 | call restore_fds_to_mark(fd_mark) |
| 2848 | return |
| 2849 | end if |
| 2850 | end do |
| 2851 | end if |
| 2852 | |
| 2853 | ! Execute in current shell (no fork) |
| 2854 | exit_status = execute_ast_node(node%subshell, shell) |
| 2855 | |
| 2856 | ! Restore file descriptors |
| 2857 | if (node%num_redirects > 0) then |
| 2858 | call restore_fds_to_mark(fd_mark) |
| 2859 | end if |
| 2860 | |
| 2861 | end function execute_brace_group_node |
| 2862 | |
| 2863 | ! ===================================== |
| 2864 | ! Function Definition Execution |
| 2865 | ! ===================================== |
| 2866 | |
| 2867 | function execute_function_def(node, shell) result(exit_status) |
| 2868 | type(command_node_t), pointer, intent(in) :: node |
| 2869 | type(shell_state_t), intent(inout) :: shell |
| 2870 | integer :: exit_status |
| 2871 | integer :: func_idx, cache_idx |
| 2872 | |
| 2873 | exit_status = 0 |
| 2874 | |
| 2875 | if (.not. associated(node%function_def)) then |
| 2876 | return |
| 2877 | end if |
| 2878 | |
| 2879 | ! Store function AST body in cache |
| 2880 | cache_idx = -1 |
| 2881 | do func_idx = 1, num_cached_functions |
| 2882 | if (trim(function_ast_cache(func_idx)%name) == trim(node%function_def%name)) then |
| 2883 | cache_idx = func_idx |
| 2884 | exit |
| 2885 | end if |
| 2886 | end do |
| 2887 | |
| 2888 | if (cache_idx == -1) then |
| 2889 | if (num_cached_functions < size(function_ast_cache)) then |
| 2890 | ! New function - append |
| 2891 | num_cached_functions = num_cached_functions + 1 |
| 2892 | cache_idx = num_cached_functions |
| 2893 | else |
| 2894 | ! Cache full - evict oldest entry (slot 1), shift down, use last slot |
| 2895 | if (associated(function_ast_cache(1)%body)) then |
| 2896 | call destroy_command_node(function_ast_cache(1)%body) |
| 2897 | end if |
| 2898 | do func_idx = 1, num_cached_functions - 1 |
| 2899 | function_ast_cache(func_idx) = function_ast_cache(func_idx + 1) |
| 2900 | end do |
| 2901 | function_ast_cache(num_cached_functions)%name = '' |
| 2902 | function_ast_cache(num_cached_functions)%body => null() |
| 2903 | cache_idx = num_cached_functions |
| 2904 | end if |
| 2905 | end if |
| 2906 | |
| 2907 | if (cache_idx > 0) then |
| 2908 | function_ast_cache(cache_idx)%name = trim(node%function_def%name) |
| 2909 | function_ast_cache(cache_idx)%body => node%function_def%body |
| 2910 | ! Detach body from parent AST so destroy_command_node won't free it |
| 2911 | ! The function cache now owns this subtree |
| 2912 | nullify(node%function_def%body) |
| 2913 | end if |
| 2914 | |
| 2915 | ! Also register in shell state for compatibility |
| 2916 | do func_idx = 1, shell%num_functions |
| 2917 | if (trim(shell%functions(func_idx)%name) == trim(node%function_def%name)) then |
| 2918 | return ! Already registered |
| 2919 | end if |
| 2920 | end do |
| 2921 | |
| 2922 | if (shell%num_functions < MAX_FUNCTIONS) then |
| 2923 | shell%num_functions = shell%num_functions + 1 |
| 2924 | shell%functions(shell%num_functions)%name = trim(node%function_def%name) |
| 2925 | shell%functions(shell%num_functions)%body_lines = 1 |
| 2926 | allocate(shell%functions(shell%num_functions)%body(1)) |
| 2927 | shell%functions(shell%num_functions)%body(1)%str = 'AST_FUNCTION' |
| 2928 | end if |
| 2929 | |
| 2930 | end function execute_function_def |
| 2931 | |
| 2932 | ! ===================================== |
| 2933 | ! Helper Functions |
| 2934 | ! ===================================== |
| 2935 | |
| 2936 | subroutine close_all_pipes(pipefd, num_pipes) |
| 2937 | integer(c_int), intent(in) :: pipefd(:,:) |
| 2938 | integer, intent(in) :: num_pipes |
| 2939 | integer :: i, ret |
| 2940 | |
| 2941 | do i = 1, num_pipes |
| 2942 | ret = c_close(pipefd(1, i)) |
| 2943 | ret = c_close(pipefd(2, i)) |
| 2944 | end do |
| 2945 | end subroutine close_all_pipes |
| 2946 | |
| 2947 | ! Trace all commands in an AST pipeline for xtrace (set -x) |
| 2948 | subroutine ast_trace_pipeline(node, shell) |
| 2949 | type(command_node_t), pointer, intent(in) :: node |
| 2950 | type(shell_state_t), intent(inout) :: shell |
| 2951 | integer :: i, j |
| 2952 | character(len=2048) :: trace_str |
| 2953 | |
| 2954 | if (.not. associated(node%pipeline)) return |
| 2955 | if (.not. associated(node%pipeline%commands)) return |
| 2956 | |
| 2957 | do i = 1, node%pipeline%num_commands |
| 2958 | if (node%pipeline%commands(i)%node_type /= CMD_SIMPLE) cycle |
| 2959 | if (.not. associated(node%pipeline%commands(i)%simple_cmd)) cycle |
| 2960 | if (node%pipeline%commands(i)%simple_cmd%num_words == 0) cycle |
| 2961 | |
| 2962 | trace_str = '' |
| 2963 | do j = 1, node%pipeline%commands(i)%simple_cmd%num_words |
| 2964 | if (j == 1) then |
| 2965 | trace_str = trim(node%pipeline%commands(i)%simple_cmd%words(j)) |
| 2966 | else |
| 2967 | trace_str = trim(trace_str) // ' ' // trim(node%pipeline%commands(i)%simple_cmd%words(j)) |
| 2968 | end if |
| 2969 | end do |
| 2970 | call trace_command(shell, trim(trace_str)) |
| 2971 | end do |
| 2972 | end subroutine ast_trace_pipeline |
| 2973 | |
| 2974 | function wait_for_process(pid) result(status) |
| 2975 | integer(c_pid_t), intent(in) :: pid |
| 2976 | integer, target :: status |
| 2977 | integer(c_pid_t) :: result |
| 2978 | |
| 2979 | status = 0 |
| 2980 | result = c_waitpid(pid, c_loc(status), WUNTRACED) |
| 2981 | if (result < 0) then |
| 2982 | status = 1 |
| 2983 | end if |
| 2984 | end function wait_for_process |
| 2985 | |
| 2986 | function extract_exit_status(status) result(exit_code) |
| 2987 | integer, intent(in) :: status |
| 2988 | integer :: exit_code |
| 2989 | |
| 2990 | ! Extract exit code from wait status |
| 2991 | exit_code = ishft(status, -8) |
| 2992 | exit_code = iand(exit_code, 255) |
| 2993 | end function extract_exit_status |
| 2994 | |
| 2995 | subroutine execute_external_command(words, num_words, exit_status) |
| 2996 | character(len=*), intent(in) :: words(:) |
| 2997 | integer, intent(in) :: num_words |
| 2998 | integer, intent(out) :: exit_status |
| 2999 | character(len=MAX_PATH_LEN) :: cmd_path |
| 3000 | integer :: ret |
| 3001 | |
| 3002 | interface |
| 3003 | function c_system(cmd) bind(c, name='system') |
| 3004 | import :: c_char, c_int |
| 3005 | character(kind=c_char), dimension(*) :: cmd |
| 3006 | integer(c_int) :: c_system |
| 3007 | end function |
| 3008 | end interface |
| 3009 | |
| 3010 | exit_status = 0 |
| 3011 | |
| 3012 | if (num_words == 0) return |
| 3013 | |
| 3014 | cmd_path = trim(words(1)) |
| 3015 | |
| 3016 | ! Try to execute command |
| 3017 | ! For now, just use system() as a placeholder |
| 3018 | ! TODO: Implement proper execvp with argv array |
| 3019 | ret = c_system(trim(cmd_path) // c_null_char) |
| 3020 | exit_status = extract_exit_status(ret) |
| 3021 | |
| 3022 | end subroutine execute_external_command |
| 3023 | |
| 3024 | ! Execute a pending trap command (set by signal_handling module) |
| 3025 | subroutine execute_pending_trap(shell) |
| 3026 | use grammar_parser, only: parse_command_line |
| 3027 | use command_tree, only: destroy_command_node |
| 3028 | type(shell_state_t), intent(inout) :: shell |
| 3029 | type(command_node_t), pointer :: trap_ast |
| 3030 | integer :: saved_status, trap_status |
| 3031 | logical :: saved_bypass |
| 3032 | character(len=4096) :: trap_cmd |
| 3033 | |
| 3034 | ! Save the trap command and signal before clearing |
| 3035 | trap_cmd = shell%pending_trap_command |
| 3036 | |
| 3037 | ! Save current exit status (traps don't affect $?) |
| 3038 | saved_status = shell%last_exit_status |
| 3039 | |
| 3040 | ! Save and clear bypass_functions — trap handlers should see all functions |
| 3041 | ! even when fired inside 'command' builtin context |
| 3042 | saved_bypass = shell%bypass_functions |
| 3043 | shell%bypass_functions = .false. |
| 3044 | |
| 3045 | ! Clear the pending trap |
| 3046 | shell%pending_trap_command = '' |
| 3047 | shell%pending_trap_signal = 0 |
| 3048 | |
| 3049 | ! Set flag to prevent recursive trap execution |
| 3050 | shell%executing_trap = .true. |
| 3051 | |
| 3052 | ! Parse and execute the trap command using AST parser |
| 3053 | trap_ast => parse_command_line(trim(trap_cmd)) |
| 3054 | if (associated(trap_ast)) then |
| 3055 | trap_status = execute_ast_node(trap_ast, shell) |
| 3056 | call destroy_command_node(trap_ast) |
| 3057 | end if |
| 3058 | |
| 3059 | ! Clear flag to allow future trap execution |
| 3060 | shell%executing_trap = .false. |
| 3061 | |
| 3062 | ! Restore bypass_functions and exit status |
| 3063 | shell%bypass_functions = saved_bypass |
| 3064 | shell%last_exit_status = saved_status |
| 3065 | end subroutine execute_pending_trap |
| 3066 | |
| 3067 | ! Check for pending signals and dispatch their trap handlers |
| 3068 | subroutine dispatch_pending_signals(shell) |
| 3069 | use signal_handling, only: get_pending_trap_signals, execute_trap |
| 3070 | type(shell_state_t), intent(inout) :: shell |
| 3071 | integer :: pending_sigs(32), sig_count, si |
| 3072 | logical :: trap_executed |
| 3073 | |
| 3074 | call get_pending_trap_signals(pending_sigs, sig_count) |
| 3075 | do si = 1, sig_count |
| 3076 | trap_executed = execute_trap(shell, pending_sigs(si)) |
| 3077 | if (trap_executed .and. len_trim(shell%pending_trap_command) > 0) then |
| 3078 | call execute_pending_trap(shell) |
| 3079 | end if |
| 3080 | end do |
| 3081 | end subroutine dispatch_pending_signals |
| 3082 | |
| 3083 | ! Process sourced files inline (for dot command in lists) |
| 3084 | subroutine process_source_inline_ast(shell) |
| 3085 | use grammar_parser, only: parse_command_line |
| 3086 | use command_tree, only: destroy_command_node |
| 3087 | use parser, only: has_unclosed_quote, ends_with_continuation_backslash, & |
| 3088 | needs_compound_continuation, remove_line_continuations |
| 3089 | type(shell_state_t), intent(inout) :: shell |
| 3090 | character(len=16384) :: input_line |
| 3091 | character(len=16384) :: continuation_line |
| 3092 | integer :: file_unit, iostat |
| 3093 | type(command_node_t), pointer :: ast_root |
| 3094 | integer :: exit_code |
| 3095 | |
| 3096 | ! Reset the source flag first |
| 3097 | shell%should_source = .false. |
| 3098 | |
| 3099 | ! Open file for reading |
| 3100 | open(newunit=file_unit, file=trim(shell%source_file), status='old', action='read', iostat=iostat) |
| 3101 | if (iostat /= 0) then |
| 3102 | write(error_unit, '(a)') 'source: failed to open ' // trim(shell%source_file) |
| 3103 | shell%last_exit_status = 1 |
| 3104 | return |
| 3105 | end if |
| 3106 | |
| 3107 | ! Increment source depth for return tracking |
| 3108 | shell%source_depth = shell%source_depth + 1 |
| 3109 | |
| 3110 | ! Execute each line in the file |
| 3111 | do |
| 3112 | read(file_unit, '(a)', iostat=iostat) input_line |
| 3113 | if (iostat /= 0) exit ! End of file or error |
| 3114 | |
| 3115 | ! Skip empty lines and comments |
| 3116 | if (len_trim(input_line) == 0 .or. input_line(1:1) == '#') cycle |
| 3117 | |
| 3118 | ! Check for unclosed quotes or backslash continuation |
| 3119 | do while (has_unclosed_quote(input_line) .or. ends_with_continuation_backslash(input_line)) |
| 3120 | read(file_unit, '(a)', iostat=iostat) continuation_line |
| 3121 | if (iostat /= 0) exit |
| 3122 | input_line = trim(input_line) // char(10) // trim(continuation_line) |
| 3123 | end do |
| 3124 | |
| 3125 | ! Handle line continuation (backslash-newline) |
| 3126 | input_line = remove_line_continuations(input_line) |
| 3127 | |
| 3128 | ! If EOF was reached during continuation, exit |
| 3129 | if (iostat /= 0) exit |
| 3130 | |
| 3131 | ! Check for unclosed compound commands (if/fi, do/done, case/esac, {/}) |
| 3132 | do while (needs_compound_continuation(input_line)) |
| 3133 | read(file_unit, '(a)', iostat=iostat) continuation_line |
| 3134 | if (iostat /= 0) exit |
| 3135 | input_line = trim(input_line) // char(10) // trim(continuation_line) |
| 3136 | end do |
| 3137 | |
| 3138 | ! Parse and execute using AST parser |
| 3139 | ast_root => parse_command_line(trim(input_line)) |
| 3140 | if (associated(ast_root)) then |
| 3141 | exit_code = execute_ast_node(ast_root, shell) |
| 3142 | shell%last_exit_status = exit_code |
| 3143 | ! Don't destroy function definitions - their AST is cached for later execution |
| 3144 | if (ast_root%node_type /= CMD_FUNCTION_DEF) then |
| 3145 | call destroy_command_node(ast_root) |
| 3146 | end if |
| 3147 | end if |
| 3148 | |
| 3149 | ! Stop execution if exit command was encountered |
| 3150 | if (.not. shell%running) exit |
| 3151 | |
| 3152 | ! Stop execution if return was called from sourced script |
| 3153 | if (shell%function_return_pending .and. shell%source_depth > 0) exit |
| 3154 | end do |
| 3155 | |
| 3156 | ! Fire RETURN trap if set (after sourced script finishes) |
| 3157 | block |
| 3158 | use signal_handling, only: get_trap_command, TRAP_RETURN |
| 3159 | character(len=4096) :: src_return_cmd |
| 3160 | src_return_cmd = get_trap_command(shell, TRAP_RETURN) |
| 3161 | if (len_trim(src_return_cmd) > 0 .and. & |
| 3162 | .not. shell%executing_trap) then |
| 3163 | block |
| 3164 | type(command_node_t), pointer :: trap_node |
| 3165 | integer :: saved_status_src |
| 3166 | logical :: saved_bypass_src |
| 3167 | saved_status_src = shell%last_exit_status |
| 3168 | saved_bypass_src = shell%bypass_functions |
| 3169 | shell%bypass_functions = .false. |
| 3170 | shell%executing_trap = .true. |
| 3171 | trap_node => parse_command_line(trim(src_return_cmd)) |
| 3172 | if (associated(trap_node)) then |
| 3173 | exit_code = execute_ast_node(trap_node, shell) |
| 3174 | call destroy_command_node(trap_node) |
| 3175 | end if |
| 3176 | shell%executing_trap = .false. |
| 3177 | shell%bypass_functions = saved_bypass_src |
| 3178 | shell%last_exit_status = saved_status_src |
| 3179 | end block |
| 3180 | end if |
| 3181 | end block |
| 3182 | |
| 3183 | ! Decrement source depth |
| 3184 | shell%source_depth = shell%source_depth - 1 |
| 3185 | |
| 3186 | ! Clear the return flag if we're exiting due to return in sourced script |
| 3187 | if (shell%function_return_pending .and. shell%function_depth == 0) then |
| 3188 | shell%function_return_pending = .false. |
| 3189 | end if |
| 3190 | |
| 3191 | close(file_unit) |
| 3192 | shell%source_file = '' |
| 3193 | end subroutine process_source_inline_ast |
| 3194 | |
| 3195 | ! Unset a function from the AST cache |
| 3196 | subroutine unset_ast_function(func_name) |
| 3197 | character(len=*), intent(in) :: func_name |
| 3198 | integer :: i |
| 3199 | |
| 3200 | do i = 1, num_cached_functions |
| 3201 | if (trim(function_ast_cache(i)%name) == trim(func_name)) then |
| 3202 | ! Clear this function from the cache |
| 3203 | function_ast_cache(i)%name = '' |
| 3204 | function_ast_cache(i)%body => null() |
| 3205 | exit |
| 3206 | end if |
| 3207 | end do |
| 3208 | end subroutine unset_ast_function |
| 3209 | |
| 3210 | ! Check if a function exists in the AST cache |
| 3211 | function is_ast_function(func_name) result(exists) |
| 3212 | character(len=*), intent(in) :: func_name |
| 3213 | logical :: exists |
| 3214 | integer :: i |
| 3215 | |
| 3216 | exists = .false. |
| 3217 | do i = 1, num_cached_functions |
| 3218 | if (trim(function_ast_cache(i)%name) == trim(func_name) .and. & |
| 3219 | len_trim(function_ast_cache(i)%name) > 0) then |
| 3220 | exists = .true. |
| 3221 | return |
| 3222 | end if |
| 3223 | end do |
| 3224 | end function is_ast_function |
| 3225 | |
| 3226 | ! Split a string on IFS characters |
| 3227 | subroutine split_on_ifs(str, ifs_chars, words, word_count) |
| 3228 | character(len=*), intent(in) :: str |
| 3229 | character(len=*), intent(in) :: ifs_chars |
| 3230 | character(len=MAX_TOKEN_LEN), intent(out) :: words(:) |
| 3231 | integer, intent(out) :: word_count |
| 3232 | integer :: i, str_len, word_pos, max_words |
| 3233 | logical :: in_word |
| 3234 | character(len=MAX_TOKEN_LEN) :: current_word |
| 3235 | |
| 3236 | word_count = 0 |
| 3237 | current_word = '' |
| 3238 | word_pos = 0 |
| 3239 | in_word = .false. |
| 3240 | str_len = len_trim(str) |
| 3241 | max_words = size(words) |
| 3242 | |
| 3243 | ! Handle empty string |
| 3244 | if (str_len == 0) then |
| 3245 | return |
| 3246 | end if |
| 3247 | |
| 3248 | ! Special case: empty IFS means no splitting - return entire string as one word |
| 3249 | if (len(ifs_chars) == 0) then |
| 3250 | word_count = 1 |
| 3251 | words(1) = str(1:str_len) |
| 3252 | return |
| 3253 | end if |
| 3254 | |
| 3255 | ! POSIX IFS splitting: non-whitespace IFS chars are explicit delimiters |
| 3256 | ! that produce empty fields between consecutive occurrences. |
| 3257 | ! IFS whitespace chars (space/tab/newline) are collapsed. |
| 3258 | block |
| 3259 | logical :: is_ifs_ws, prev_was_nonws_delim |
| 3260 | prev_was_nonws_delim = .false. |
| 3261 | do i = 1, str_len |
| 3262 | if (index(ifs_chars, str(i:i)) > 0) then |
| 3263 | is_ifs_ws = (str(i:i) == ' ' .or. str(i:i) == char(9) .or. str(i:i) == char(10)) |
| 3264 | if (in_word) then |
| 3265 | ! End current word |
| 3266 | word_count = word_count + 1 |
| 3267 | if (word_count <= max_words) then |
| 3268 | words(word_count) = current_word(1:word_pos) |
| 3269 | end if |
| 3270 | current_word = '' |
| 3271 | word_pos = 0 |
| 3272 | in_word = .false. |
| 3273 | else if (.not. is_ifs_ws .and. prev_was_nonws_delim) then |
| 3274 | ! Consecutive non-whitespace IFS chars produce empty fields |
| 3275 | word_count = word_count + 1 |
| 3276 | if (word_count <= max_words) then |
| 3277 | words(word_count) = '' |
| 3278 | end if |
| 3279 | end if |
| 3280 | prev_was_nonws_delim = .not. is_ifs_ws |
| 3281 | else |
| 3282 | ! Non-IFS character - add to current word |
| 3283 | word_pos = word_pos + 1 |
| 3284 | current_word(word_pos:word_pos) = str(i:i) |
| 3285 | in_word = .true. |
| 3286 | prev_was_nonws_delim = .false. |
| 3287 | end if |
| 3288 | end do |
| 3289 | end block |
| 3290 | |
| 3291 | ! Add final word if any |
| 3292 | if (in_word) then |
| 3293 | word_count = word_count + 1 |
| 3294 | if (word_count <= max_words) then |
| 3295 | words(word_count) = current_word(1:word_pos) |
| 3296 | end if |
| 3297 | end if |
| 3298 | end subroutine split_on_ifs |
| 3299 | |
| 3300 | ! Pre-expand all simple command words in a pipeline before forking |
| 3301 | ! POSIX: Expansion errors should go to parent shell's stderr |
| 3302 | subroutine pre_expand_pipeline(node, shell) |
| 3303 | use pipeline_helpers, only: expand_tokens |
| 3304 | type(command_node_t), pointer, intent(in) :: node |
| 3305 | type(shell_state_t), intent(inout) :: shell |
| 3306 | integer :: i, j |
| 3307 | type(command_t) :: temp_cmd |
| 3308 | |
| 3309 | if (.not. associated(node%pipeline)) return |
| 3310 | if (.not. associated(node%pipeline%commands)) return |
| 3311 | |
| 3312 | do i = 1, node%pipeline%num_commands |
| 3313 | if (node%pipeline%commands(i)%node_type /= CMD_SIMPLE) cycle |
| 3314 | if (.not. associated(node%pipeline%commands(i)%simple_cmd)) cycle |
| 3315 | |
| 3316 | ! Build temporary command structure for expansion |
| 3317 | temp_cmd%num_tokens = node%pipeline%commands(i)%simple_cmd%num_words |
| 3318 | if (temp_cmd%num_tokens == 0) cycle |
| 3319 | |
| 3320 | allocate(character(len=MAX_TOKEN_LEN) :: temp_cmd%tokens(temp_cmd%num_tokens)) |
| 3321 | allocate(temp_cmd%token_quoted(temp_cmd%num_tokens)) |
| 3322 | allocate(temp_cmd%token_escaped(temp_cmd%num_tokens)) |
| 3323 | allocate(temp_cmd%token_quote_type(temp_cmd%num_tokens)) |
| 3324 | allocate(temp_cmd%token_lengths(temp_cmd%num_tokens)) |
| 3325 | |
| 3326 | ! Copy words to temp command |
| 3327 | do j = 1, temp_cmd%num_tokens |
| 3328 | ! Preserve whitespace for quoted tokens by using word_lengths |
| 3329 | if (allocated(node%pipeline%commands(i)%simple_cmd%word_was_quoted) .and. & |
| 3330 | allocated(node%pipeline%commands(i)%simple_cmd%word_lengths)) then |
| 3331 | if (node%pipeline%commands(i)%simple_cmd%word_was_quoted(j)) then |
| 3332 | temp_cmd%tokens(j) = node%pipeline%commands(i)%simple_cmd%words(j)( & |
| 3333 | 1:node%pipeline%commands(i)%simple_cmd%word_lengths(j)) |
| 3334 | temp_cmd%token_lengths(j) = node%pipeline%commands(i)%simple_cmd%word_lengths(j) |
| 3335 | else |
| 3336 | temp_cmd%tokens(j) = trim(node%pipeline%commands(i)%simple_cmd%words(j)) |
| 3337 | temp_cmd%token_lengths(j) = len_trim(node%pipeline%commands(i)%simple_cmd%words(j)) |
| 3338 | end if |
| 3339 | else |
| 3340 | temp_cmd%tokens(j) = trim(node%pipeline%commands(i)%simple_cmd%words(j)) |
| 3341 | temp_cmd%token_lengths(j) = len_trim(node%pipeline%commands(i)%simple_cmd%words(j)) |
| 3342 | end if |
| 3343 | if (allocated(node%pipeline%commands(i)%simple_cmd%word_was_quoted)) then |
| 3344 | temp_cmd%token_quoted(j) = node%pipeline%commands(i)%simple_cmd%word_was_quoted(j) |
| 3345 | else |
| 3346 | temp_cmd%token_quoted(j) = .false. |
| 3347 | end if |
| 3348 | if (allocated(node%pipeline%commands(i)%simple_cmd%word_was_escaped)) then |
| 3349 | temp_cmd%token_escaped(j) = node%pipeline%commands(i)%simple_cmd%word_was_escaped(j) |
| 3350 | else |
| 3351 | temp_cmd%token_escaped(j) = .false. |
| 3352 | end if |
| 3353 | if (allocated(node%pipeline%commands(i)%simple_cmd%word_quote_type)) then |
| 3354 | temp_cmd%token_quote_type(j) = node%pipeline%commands(i)%simple_cmd%word_quote_type(j) |
| 3355 | else |
| 3356 | temp_cmd%token_quote_type(j) = QUOTE_NONE |
| 3357 | end if |
| 3358 | end do |
| 3359 | |
| 3360 | ! Expand tokens (errors go to parent stderr) |
| 3361 | call expand_tokens(temp_cmd, shell) |
| 3362 | |
| 3363 | ! Move expanded tokens into AST node — avoids allocating + copying large arrays |
| 3364 | if (allocated(node%pipeline%commands(i)%simple_cmd%words)) & |
| 3365 | deallocate(node%pipeline%commands(i)%simple_cmd%words) |
| 3366 | if (allocated(node%pipeline%commands(i)%simple_cmd%word_lengths)) & |
| 3367 | deallocate(node%pipeline%commands(i)%simple_cmd%word_lengths) |
| 3368 | if (allocated(node%pipeline%commands(i)%simple_cmd%word_was_quoted)) & |
| 3369 | deallocate(node%pipeline%commands(i)%simple_cmd%word_was_quoted) |
| 3370 | if (allocated(node%pipeline%commands(i)%simple_cmd%word_was_escaped)) & |
| 3371 | deallocate(node%pipeline%commands(i)%simple_cmd%word_was_escaped) |
| 3372 | if (allocated(node%pipeline%commands(i)%simple_cmd%word_quote_type)) & |
| 3373 | deallocate(node%pipeline%commands(i)%simple_cmd%word_quote_type) |
| 3374 | |
| 3375 | call move_alloc(temp_cmd%tokens, node%pipeline%commands(i)%simple_cmd%words) |
| 3376 | call move_alloc(temp_cmd%token_lengths, node%pipeline%commands(i)%simple_cmd%word_lengths) |
| 3377 | call move_alloc(temp_cmd%token_quoted, node%pipeline%commands(i)%simple_cmd%word_was_quoted) |
| 3378 | call move_alloc(temp_cmd%token_escaped, node%pipeline%commands(i)%simple_cmd%word_was_escaped) |
| 3379 | call move_alloc(temp_cmd%token_quote_type, node%pipeline%commands(i)%simple_cmd%word_quote_type) |
| 3380 | node%pipeline%commands(i)%simple_cmd%num_words = temp_cmd%num_tokens |
| 3381 | |
| 3382 | ! Mark as pre-expanded so executor skips expansion |
| 3383 | node%pipeline%commands(i)%simple_cmd%pre_expanded = .true. |
| 3384 | end do |
| 3385 | end subroutine pre_expand_pipeline |
| 3386 | |
| 3387 | ! Check if a string is a valid shell variable name for assignment |
| 3388 | ! POSIX: name must start with letter or underscore, followed by letters, digits, or underscores |
| 3389 | function is_valid_assignment_name(name) result(valid) |
| 3390 | character(len=*), intent(in) :: name |
| 3391 | logical :: valid |
| 3392 | integer :: i, name_len |
| 3393 | character :: ch |
| 3394 | |
| 3395 | valid = .false. |
| 3396 | name_len = len_trim(name) |
| 3397 | |
| 3398 | if (name_len == 0) return |
| 3399 | |
| 3400 | ! First character must be letter or underscore |
| 3401 | ch = name(1:1) |
| 3402 | if (.not. ((ch >= 'a' .and. ch <= 'z') .or. & |
| 3403 | (ch >= 'A' .and. ch <= 'Z') .or. & |
| 3404 | ch == '_')) then |
| 3405 | return |
| 3406 | end if |
| 3407 | |
| 3408 | ! Remaining characters must be letter, digit, or underscore |
| 3409 | do i = 2, name_len |
| 3410 | ch = name(i:i) |
| 3411 | if (.not. ((ch >= 'a' .and. ch <= 'z') .or. & |
| 3412 | (ch >= 'A' .and. ch <= 'Z') .or. & |
| 3413 | (ch >= '0' .and. ch <= '9') .or. & |
| 3414 | ch == '_')) then |
| 3415 | return |
| 3416 | end if |
| 3417 | end do |
| 3418 | |
| 3419 | valid = .true. |
| 3420 | end function is_valid_assignment_name |
| 3421 | |
| 3422 | ! Mark traps as inherited for subshell: traps remain visible for listing |
| 3423 | ! but will not be executed when the subshell exits |
| 3424 | ! POSIX: `trap` command should show parent's traps, but they don't execute in subshell |
| 3425 | subroutine filter_traps_for_subshell(shell) |
| 3426 | type(shell_state_t), intent(inout) :: shell |
| 3427 | integer :: i |
| 3428 | |
| 3429 | do i = 1, shell%num_traps |
| 3430 | if (shell%traps(i)%active) then |
| 3431 | ! Mark all traps with commands as inherited (visible but not executed) |
| 3432 | ! Empty command traps (ignore) remain effective |
| 3433 | if (len_trim(shell%traps(i)%command) > 0) then |
| 3434 | shell%traps(i)%inherited = .true. |
| 3435 | end if |
| 3436 | end if |
| 3437 | end do |
| 3438 | end subroutine filter_traps_for_subshell |
| 3439 | |
| 3440 | subroutine run_exit_trap_in_subshell(shell) |
| 3441 | use trap_dispatch, only: eval_trap_string |
| 3442 | type(shell_state_t), intent(inout) :: shell |
| 3443 | integer :: i, trap_exit_code |
| 3444 | |
| 3445 | if (shell%executing_trap .or. shell%exit_trap_executed) return |
| 3446 | |
| 3447 | ! Find EXIT trap (signal 0) that was set in this subshell |
| 3448 | do i = 1, shell%num_traps |
| 3449 | if (shell%traps(i)%signal == 0 .and. & |
| 3450 | shell%traps(i)%active .and. & |
| 3451 | .not. shell%traps(i)%inherited .and. & |
| 3452 | len_trim(shell%traps(i)%command) > 0) then |
| 3453 | shell%exit_trap_executed = .true. |
| 3454 | shell%executing_trap = .true. |
| 3455 | call eval_trap_string( & |
| 3456 | trim(shell%traps(i)%command), & |
| 3457 | shell, trap_exit_code) |
| 3458 | shell%executing_trap = .false. |
| 3459 | return |
| 3460 | end if |
| 3461 | end do |
| 3462 | end subroutine run_exit_trap_in_subshell |
| 3463 | |
| 3464 | end module ast_executor |
| 3465 |