| 1 | ! ============================================================================== |
| 2 | ! Module: variables |
| 3 | ! Purpose: Shell variable management and assignment |
| 4 | ! ============================================================================== |
| 5 | module variables |
| 6 | use shell_types |
| 7 | use system_interface |
| 8 | use iso_fortran_env, only: output_unit, error_unit |
| 9 | use io_helpers, only: write_stderr |
| 10 | #ifdef USE_C_STRINGS |
| 11 | use iso_c_binding, only: c_ptr, c_char, c_int, c_size_t |
| 12 | #endif |
| 13 | implicit none |
| 14 | |
| 15 | #ifdef USE_C_STRINGS |
| 16 | interface |
| 17 | function c_vbuf_append_chars(handle, str, slen) result(rc) bind(C, name='fortsh_buffer_append_chars') |
| 18 | import :: c_ptr, c_int, c_char, c_size_t |
| 19 | type(c_ptr), value :: handle |
| 20 | character(kind=c_char), intent(in) :: str(*) |
| 21 | integer(c_size_t), value :: slen |
| 22 | integer(c_int) :: rc |
| 23 | end function |
| 24 | end interface |
| 25 | #endif |
| 26 | |
| 27 | contains |
| 28 | |
| 29 | ! Safe allocatable string assignment — works around flang-new ARM64 bug where |
| 30 | ! allocatable assignment corrupts values >16 bytes. Allocates to exact length |
| 31 | ! then copies character-by-character to avoid the substring temporary. |
| 32 | subroutine safe_assign_alloc_str(dest, src, src_len) |
| 33 | character(len=:), allocatable, intent(inout) :: dest |
| 34 | character(len=*), intent(in) :: src |
| 35 | integer, intent(in) :: src_len |
| 36 | integer :: k |
| 37 | if (allocated(dest)) deallocate(dest) |
| 38 | if (src_len <= 0) then |
| 39 | allocate(character(len=0) :: dest) |
| 40 | return |
| 41 | end if |
| 42 | allocate(character(len=src_len) :: dest) |
| 43 | do k = 1, src_len |
| 44 | dest(k:k) = src(k:k) |
| 45 | end do |
| 46 | end subroutine |
| 47 | |
| 48 | subroutine set_shell_variable(shell, name, value, value_length) |
| 49 | use iso_fortran_env, only: error_unit |
| 50 | type(shell_state_t), intent(inout) :: shell |
| 51 | character(len=*), intent(in) :: name, value |
| 52 | integer, intent(in), optional :: value_length |
| 53 | integer :: i, empty_slot, iostat, actual_len, depth |
| 54 | |
| 55 | |
| 56 | empty_slot = -1 |
| 57 | |
| 58 | ! Calculate actual length (use provided length or len_trim as fallback) |
| 59 | if (present(value_length)) then |
| 60 | actual_len = value_length |
| 61 | else |
| 62 | actual_len = len_trim(value) |
| 63 | end if |
| 64 | |
| 65 | ! First check local variables - if variable exists in current function scope, update it there |
| 66 | if (shell%function_depth > 0) then |
| 67 | depth = shell%function_depth |
| 68 | if (depth <= size(shell%local_var_counts)) then |
| 69 | do i = 1, shell%local_var_counts(depth) |
| 70 | if (trim(shell%local_vars(depth, i)%name) == trim(name)) then |
| 71 | ! Found existing local variable - update it |
| 72 | call safe_assign_alloc_str(shell%local_vars(depth, i)%value, value, actual_len) |
| 73 | shell%local_vars(depth, i)%value_len = actual_len |
| 74 | return |
| 75 | end if |
| 76 | end do |
| 77 | end if |
| 78 | end if |
| 79 | |
| 80 | ! Handle special built-in variables |
| 81 | select case (trim(name)) |
| 82 | case ('PS1') |
| 83 | shell%ps1 = value |
| 84 | ! For prompts, always use len_trim to get actual content length |
| 85 | shell%ps1_len = len_trim(value) |
| 86 | return |
| 87 | case ('PS2') |
| 88 | shell%ps2 = value |
| 89 | if (present(value_length)) then |
| 90 | shell%ps2_len = value_length |
| 91 | else |
| 92 | shell%ps2_len = len(value) |
| 93 | end if |
| 94 | return |
| 95 | case ('PS3') |
| 96 | shell%ps3 = value |
| 97 | if (present(value_length)) then |
| 98 | shell%ps3_len = value_length |
| 99 | else |
| 100 | shell%ps3_len = len(value) |
| 101 | end if |
| 102 | return |
| 103 | case ('PS4') |
| 104 | shell%ps4 = value |
| 105 | if (present(value_length)) then |
| 106 | shell%ps4_len = value_length |
| 107 | else |
| 108 | shell%ps4_len = len(value) |
| 109 | end if |
| 110 | return |
| 111 | case ('IFS') |
| 112 | shell%ifs = value(1:actual_len) |
| 113 | shell%ifs_len = actual_len |
| 114 | ! Don't return - continue to add IFS to variables array too |
| 115 | ! This allows checking if IFS was explicitly set vs using default |
| 116 | case ('PWD') |
| 117 | ! Update shell%cwd when PWD is set |
| 118 | shell%cwd = value(1:min(actual_len, len(shell%cwd))) |
| 119 | ! Also update environment for child processes |
| 120 | if (.not. set_environment_var('PWD', trim(shell%cwd))) then |
| 121 | ! Silently ignore errors |
| 122 | end if |
| 123 | return |
| 124 | case ('OLDPWD') |
| 125 | ! Update shell%oldpwd when OLDPWD is set |
| 126 | shell%oldpwd = value(1:min(actual_len, len(shell%oldpwd))) |
| 127 | ! Also update environment for child processes |
| 128 | if (.not. set_environment_var('OLDPWD', trim(shell%oldpwd))) then |
| 129 | ! Silently ignore errors |
| 130 | end if |
| 131 | return |
| 132 | case ('PATH') |
| 133 | ! PATH must ALWAYS update environment so child processes use new PATH |
| 134 | if (.not. set_environment_var('PATH', value(1:actual_len))) then |
| 135 | ! Silently ignore errors |
| 136 | end if |
| 137 | ! Clear hash table when PATH changes (bash behavior) |
| 138 | shell%num_hashed_commands = 0 |
| 139 | ! Don't return - continue to store in variables array too |
| 140 | case ('HISTFILE') |
| 141 | shell%histfile = value |
| 142 | return |
| 143 | case ('HISTSIZE') |
| 144 | read(value, *, iostat=iostat) shell%histsize |
| 145 | if (iostat /= 0) shell%histsize = 1000 |
| 146 | return |
| 147 | case ('HISTFILESIZE') |
| 148 | read(value, *, iostat=iostat) shell%histfilesize |
| 149 | if (iostat /= 0) shell%histfilesize = 2000 |
| 150 | return |
| 151 | case ('HISTCONTROL') |
| 152 | shell%histcontrol = value |
| 153 | ! Note: histcontrol is also updated in fortsh.f90 via set_histcontrol() |
| 154 | return |
| 155 | end select |
| 156 | |
| 157 | ! Check if variable already exists |
| 158 | do i = 1, shell%num_variables |
| 159 | if (trim(shell%variables(i)%name) == trim(name)) then |
| 160 | ! Check if variable is readonly |
| 161 | if (shell%variables(i)%readonly) then |
| 162 | block |
| 163 | character(len=32) :: line_str |
| 164 | write(line_str, '(i0)') shell%current_line_number |
| 165 | call write_stderr('fortsh: line ' // trim(line_str) // ': ' // & |
| 166 | trim(name) // ': readonly variable') |
| 167 | end block |
| 168 | shell%last_exit_status = 1 ! POSIX: readonly assignment failure returns 1 |
| 169 | ! POSIX: In non-interactive shells, stop execution after readonly violation |
| 170 | if (.not. shell%is_interactive) then |
| 171 | shell%running = .false. |
| 172 | end if |
| 173 | return |
| 174 | end if |
| 175 | call safe_assign_alloc_str(shell%variables(i)%value, value, actual_len) |
| 176 | shell%variables(i)%value_len = actual_len |
| 177 | ! If exported, update environment |
| 178 | if (shell%variables(i)%exported) then |
| 179 | if (.not. set_environment_var(trim(name), value(1:actual_len))) then |
| 180 | write(error_unit, '(a)') 'warning: failed to update environment variable' |
| 181 | end if |
| 182 | end if |
| 183 | return |
| 184 | end if |
| 185 | end do |
| 186 | |
| 187 | ! Find empty slot |
| 188 | do i = 1, size(shell%variables) |
| 189 | ! Check for empty name (null character or spaces) |
| 190 | if (shell%variables(i)%name(1:1) == char(0) .or. trim(shell%variables(i)%name) == '') then |
| 191 | empty_slot = i |
| 192 | exit |
| 193 | end if |
| 194 | end do |
| 195 | |
| 196 | ! Add new variable |
| 197 | if (empty_slot > 0) then |
| 198 | shell%variables(empty_slot)%name = name |
| 199 | call safe_assign_alloc_str(shell%variables(empty_slot)%value, value, actual_len) |
| 200 | shell%variables(empty_slot)%value_len = actual_len |
| 201 | shell%num_variables = shell%num_variables + 1 |
| 202 | end if |
| 203 | end subroutine |
| 204 | |
| 205 | function get_shell_variable(shell, name) result(value) |
| 206 | type(shell_state_t), intent(in) :: shell |
| 207 | character(len=*), intent(in) :: name |
| 208 | character(len=:), allocatable :: value |
| 209 | integer :: i, depth |
| 210 | character(len=20) :: fmt_buf |
| 211 | |
| 212 | value = '' |
| 213 | |
| 214 | ! First check local variables (innermost scope first) |
| 215 | if (shell%function_depth > 0) then |
| 216 | do depth = shell%function_depth, 1, -1 |
| 217 | if (depth <= size(shell%local_var_counts)) then |
| 218 | do i = 1, shell%local_var_counts(depth) |
| 219 | if (trim(shell%local_vars(depth, i)%name) == trim(name)) then |
| 220 | ! value_len=-1 means explicitly unset local (shadows global) |
| 221 | if (shell%local_vars(depth, i)%value_len == -1) then |
| 222 | value = '' |
| 223 | return |
| 224 | end if |
| 225 | value = shell%local_vars(depth, i)%value |
| 226 | return |
| 227 | end if |
| 228 | end do |
| 229 | end if |
| 230 | end do |
| 231 | end if |
| 232 | |
| 233 | ! Handle special variables |
| 234 | select case (trim(name)) |
| 235 | case ('$') |
| 236 | write(fmt_buf, '(i0)') shell%shell_pid |
| 237 | value = trim(adjustl(fmt_buf)) |
| 238 | return |
| 239 | case ('!') |
| 240 | write(fmt_buf, '(i0)') shell%last_bg_pid |
| 241 | value = trim(adjustl(fmt_buf)) |
| 242 | return |
| 243 | case ('?') |
| 244 | write(fmt_buf, '(i0)') shell%last_exit_status |
| 245 | value = trim(adjustl(fmt_buf)) |
| 246 | return |
| 247 | case ('0') |
| 248 | value = trim(shell%shell_name) |
| 249 | return |
| 250 | case ('_') |
| 251 | ! Last argument of previous command |
| 252 | value = trim(shell%last_arg) |
| 253 | return |
| 254 | case ('-') |
| 255 | ! Current shell options as flags |
| 256 | value = get_shell_option_flags(shell) |
| 257 | return |
| 258 | case ('PPID') |
| 259 | write(fmt_buf, '(i0)') int(shell%parent_pid) |
| 260 | value = trim(adjustl(fmt_buf)) |
| 261 | return |
| 262 | case ('UID') |
| 263 | write(fmt_buf, '(i0)') shell%uid |
| 264 | value = trim(adjustl(fmt_buf)) |
| 265 | return |
| 266 | case ('EUID') |
| 267 | write(fmt_buf, '(i0)') shell%euid |
| 268 | value = trim(adjustl(fmt_buf)) |
| 269 | return |
| 270 | case ('PWD') |
| 271 | value = trim(shell%cwd) |
| 272 | return |
| 273 | case ('OLDPWD') |
| 274 | value = trim(shell%oldpwd) |
| 275 | return |
| 276 | case ('RANDOM') |
| 277 | write(fmt_buf, '(i0)') get_random_int() |
| 278 | value = trim(adjustl(fmt_buf)) |
| 279 | return |
| 280 | case ('SECONDS') |
| 281 | write(fmt_buf, '(i0)') get_elapsed_seconds(shell) |
| 282 | value = trim(adjustl(fmt_buf)) |
| 283 | return |
| 284 | case ('LINENO') |
| 285 | write(fmt_buf, '(i0)') shell%current_line_number |
| 286 | value = trim(adjustl(fmt_buf)) |
| 287 | return |
| 288 | case ('#') |
| 289 | write(fmt_buf, '(I0)') shell%num_positional |
| 290 | value = trim(adjustl(fmt_buf)) |
| 291 | return |
| 292 | case ('*') |
| 293 | block |
| 294 | character(len=4096) :: params_buf |
| 295 | call get_all_positional_params(shell, params_buf, .true.) |
| 296 | value = trim(params_buf) |
| 297 | end block |
| 298 | return |
| 299 | case ('@') |
| 300 | block |
| 301 | character(len=4096) :: params_buf |
| 302 | call get_all_positional_params(shell, params_buf, .false.) |
| 303 | value = trim(params_buf) |
| 304 | end block |
| 305 | return |
| 306 | case ('IFS') |
| 307 | ! Internal field separator - use ifs_len to preserve whitespace |
| 308 | if (shell%ifs_len > 0) then |
| 309 | value = shell%ifs(1:shell%ifs_len) |
| 310 | else |
| 311 | value = '' |
| 312 | end if |
| 313 | return |
| 314 | case ('PS1') |
| 315 | value = shell%ps1 |
| 316 | return |
| 317 | case ('PS2') |
| 318 | value = shell%ps2 |
| 319 | return |
| 320 | case ('PS3') |
| 321 | value = shell%ps3 |
| 322 | return |
| 323 | case ('PS4') |
| 324 | value = shell%ps4 |
| 325 | return |
| 326 | case ('HISTFILE') |
| 327 | value = trim(shell%histfile) |
| 328 | return |
| 329 | case ('HISTSIZE') |
| 330 | write(fmt_buf, '(i0)') shell%histsize |
| 331 | value = trim(adjustl(fmt_buf)) |
| 332 | return |
| 333 | case ('HISTFILESIZE') |
| 334 | write(fmt_buf, '(i0)') shell%histfilesize |
| 335 | value = trim(adjustl(fmt_buf)) |
| 336 | return |
| 337 | case ('HISTCONTROL') |
| 338 | value = trim(shell%histcontrol) |
| 339 | return |
| 340 | end select |
| 341 | |
| 342 | ! Handle numeric positional parameters ($1, $2, ..., $n) |
| 343 | if (is_numeric(trim(name))) then |
| 344 | i = string_to_int(trim(name)) |
| 345 | if (i >= 1 .and. i <= shell%num_positional) then |
| 346 | value = trim(shell%positional_params(i)%str) |
| 347 | return |
| 348 | else |
| 349 | value = '' |
| 350 | return |
| 351 | end if |
| 352 | end if |
| 353 | |
| 354 | ! Handle regular shell variables |
| 355 | do i = 1, shell%num_variables |
| 356 | if (trim(shell%variables(i)%name) == trim(name)) then |
| 357 | ! Use value_len to preserve trailing whitespace |
| 358 | if (shell%variables(i)%value_len > 0) then |
| 359 | value = shell%variables(i)%value(1:shell%variables(i)%value_len) |
| 360 | else |
| 361 | value = shell%variables(i)%value |
| 362 | end if |
| 363 | return |
| 364 | end if |
| 365 | end do |
| 366 | |
| 367 | ! Handle environment variables if not found in shell variables |
| 368 | value = get_environment_var(trim(name)) |
| 369 | end function |
| 370 | |
| 371 | #ifdef USE_C_STRINGS |
| 372 | ! Copy variable value directly into a C buffer — no allocatable intermediaries. |
| 373 | ! This avoids the flang-new heap corruption that occurs when large (>2KB) |
| 374 | ! allocatable strings are returned from get_shell_variable. |
| 375 | subroutine get_shell_variable_to_cbuf(shell, name, cbuf) |
| 376 | type(shell_state_t), intent(in) :: shell |
| 377 | character(len=*), intent(in) :: name |
| 378 | type(c_ptr), intent(in) :: cbuf |
| 379 | integer :: i, depth, vlen, rc |
| 380 | character(len=20) :: fmt_buf |
| 381 | |
| 382 | ! Check local variables first |
| 383 | if (shell%function_depth > 0) then |
| 384 | do depth = shell%function_depth, 1, -1 |
| 385 | if (depth <= size(shell%local_var_counts)) then |
| 386 | do i = 1, shell%local_var_counts(depth) |
| 387 | if (trim(shell%local_vars(depth, i)%name) == trim(name)) then |
| 388 | if (shell%local_vars(depth, i)%value_len == -1) return |
| 389 | vlen = len_trim(shell%local_vars(depth, i)%value) |
| 390 | if (vlen > 0) rc = c_vbuf_append_chars(cbuf, & |
| 391 | shell%local_vars(depth, i)%value, int(vlen, c_size_t)) |
| 392 | return |
| 393 | end if |
| 394 | end do |
| 395 | end if |
| 396 | end do |
| 397 | end if |
| 398 | |
| 399 | ! Handle special variables (small strings, safe to use fmt_buf) |
| 400 | select case (trim(name)) |
| 401 | case ('$') |
| 402 | write(fmt_buf, '(i0)') shell%shell_pid |
| 403 | vlen = len_trim(fmt_buf) |
| 404 | rc = c_vbuf_append_chars(cbuf, fmt_buf, int(vlen, c_size_t)) |
| 405 | return |
| 406 | case ('!') |
| 407 | write(fmt_buf, '(i0)') shell%last_bg_pid |
| 408 | vlen = len_trim(fmt_buf) |
| 409 | rc = c_vbuf_append_chars(cbuf, fmt_buf, int(vlen, c_size_t)) |
| 410 | return |
| 411 | case ('?') |
| 412 | write(fmt_buf, '(i0)') shell%last_exit_status |
| 413 | vlen = len_trim(fmt_buf) |
| 414 | rc = c_vbuf_append_chars(cbuf, fmt_buf, int(vlen, c_size_t)) |
| 415 | return |
| 416 | case ('0') |
| 417 | vlen = len_trim(shell%shell_name) |
| 418 | if (vlen > 0) rc = c_vbuf_append_chars(cbuf, shell%shell_name, int(vlen, c_size_t)) |
| 419 | return |
| 420 | case ('_') |
| 421 | vlen = len_trim(shell%last_arg) |
| 422 | if (vlen > 0) rc = c_vbuf_append_chars(cbuf, shell%last_arg, int(vlen, c_size_t)) |
| 423 | return |
| 424 | end select |
| 425 | |
| 426 | ! Handle regular shell variables — copy directly from storage, no allocatable |
| 427 | do i = 1, shell%num_variables |
| 428 | if (trim(shell%variables(i)%name) == trim(name)) then |
| 429 | if (shell%variables(i)%value_len > 0) then |
| 430 | vlen = shell%variables(i)%value_len |
| 431 | else |
| 432 | vlen = len_trim(shell%variables(i)%value) |
| 433 | end if |
| 434 | if (vlen > 0) rc = c_vbuf_append_chars(cbuf, & |
| 435 | shell%variables(i)%value, int(vlen, c_size_t)) |
| 436 | return |
| 437 | end if |
| 438 | end do |
| 439 | |
| 440 | ! Fall back to environment (small strings, safe) |
| 441 | ! Use get_shell_variable for the env fallback since env vars are small |
| 442 | block |
| 443 | character(len=:), allocatable :: env_val |
| 444 | env_val = get_environment_var(trim(name)) |
| 445 | vlen = len_trim(env_val) |
| 446 | if (vlen > 0) rc = c_vbuf_append_chars(cbuf, env_val, int(vlen, c_size_t)) |
| 447 | end block |
| 448 | end subroutine |
| 449 | #endif |
| 450 | |
| 451 | function is_shell_variable_set(shell, name) result(is_set) |
| 452 | type(shell_state_t), intent(in) :: shell |
| 453 | character(len=*), intent(in) :: name |
| 454 | logical :: is_set |
| 455 | integer :: i, depth |
| 456 | |
| 457 | is_set = .false. |
| 458 | |
| 459 | ! First check local variables (innermost scope first) |
| 460 | if (shell%function_depth > 0) then |
| 461 | do depth = shell%function_depth, 1, -1 |
| 462 | if (depth <= size(shell%local_var_counts)) then |
| 463 | do i = 1, shell%local_var_counts(depth) |
| 464 | if (trim(shell%local_vars(depth, i)%name) == trim(name)) then |
| 465 | ! value_len=-1 means explicitly unset local (shadows global) |
| 466 | if (shell%local_vars(depth, i)%value_len == -1) then |
| 467 | is_set = .false. |
| 468 | else |
| 469 | is_set = .true. |
| 470 | end if |
| 471 | return |
| 472 | end if |
| 473 | end do |
| 474 | end if |
| 475 | end do |
| 476 | end if |
| 477 | |
| 478 | ! Check special variables (most are always set) |
| 479 | select case (trim(name)) |
| 480 | case ('$', '!', '?', '0', '_', '-', 'PPID', 'UID', 'EUID', & |
| 481 | 'PWD', 'OLDPWD', 'RANDOM', 'SECONDS', 'LINENO', '#', '*', '@', & |
| 482 | 'IFS', 'PS1', 'PS2', 'PS3', 'PS4', 'HISTFILE', 'HISTSIZE', & |
| 483 | 'HISTFILESIZE', 'HISTCONTROL') |
| 484 | is_set = .true. |
| 485 | return |
| 486 | end select |
| 487 | |
| 488 | ! Handle numeric positional parameters ($1, $2, ..., $n) |
| 489 | if (is_numeric(trim(name))) then |
| 490 | i = string_to_int(trim(name)) |
| 491 | if (i >= 1 .and. i <= shell%num_positional) then |
| 492 | is_set = .true. |
| 493 | return |
| 494 | end if |
| 495 | end if |
| 496 | |
| 497 | ! Check regular shell variables |
| 498 | do i = 1, shell%num_variables |
| 499 | if (trim(shell%variables(i)%name) == trim(name)) then |
| 500 | is_set = .true. |
| 501 | return |
| 502 | end if |
| 503 | end do |
| 504 | |
| 505 | ! Check environment variables |
| 506 | if (len_trim(get_environment_var(trim(name))) > 0) then |
| 507 | is_set = .true. |
| 508 | end if |
| 509 | end function |
| 510 | |
| 511 | ! Get the actual length of a shell variable (preserving whitespace) |
| 512 | function get_shell_variable_length(shell, name) result(var_len) |
| 513 | type(shell_state_t), intent(in) :: shell |
| 514 | character(len=*), intent(in) :: name |
| 515 | integer :: var_len |
| 516 | integer :: i, depth |
| 517 | character(len=20) :: temp_value |
| 518 | |
| 519 | var_len = 0 |
| 520 | |
| 521 | ! First check local variables (innermost scope first) |
| 522 | if (shell%function_depth > 0) then |
| 523 | do depth = shell%function_depth, 1, -1 |
| 524 | if (depth <= size(shell%local_var_counts)) then |
| 525 | do i = 1, shell%local_var_counts(depth) |
| 526 | if (trim(shell%local_vars(depth, i)%name) == trim(name)) then |
| 527 | ! value_len=-1 means explicitly unset local |
| 528 | if (shell%local_vars(depth, i)%value_len == -1) then |
| 529 | var_len = 0 |
| 530 | else |
| 531 | var_len = len_trim(shell%local_vars(depth, i)%value) |
| 532 | end if |
| 533 | return |
| 534 | end if |
| 535 | end do |
| 536 | end if |
| 537 | end do |
| 538 | end if |
| 539 | |
| 540 | ! Handle special variables |
| 541 | select case (trim(name)) |
| 542 | case ('IFS') |
| 543 | ! Use ifs_len to preserve whitespace (even if it's all spaces) |
| 544 | var_len = shell%ifs_len |
| 545 | return |
| 546 | case ('PS1') |
| 547 | var_len = shell%ps1_len |
| 548 | return |
| 549 | case ('PS2') |
| 550 | var_len = shell%ps2_len |
| 551 | return |
| 552 | case ('PS3') |
| 553 | var_len = shell%ps3_len |
| 554 | return |
| 555 | case ('PS4') |
| 556 | var_len = shell%ps4_len |
| 557 | return |
| 558 | case ('PWD') |
| 559 | var_len = len_trim(shell%cwd) |
| 560 | return |
| 561 | case ('OLDPWD') |
| 562 | var_len = len_trim(shell%oldpwd) |
| 563 | return |
| 564 | case ('?') |
| 565 | write(temp_value, '(i15)') shell%last_exit_status |
| 566 | var_len = len_trim(adjustl(temp_value)) |
| 567 | return |
| 568 | case ('#') |
| 569 | write(temp_value, '(i15)') shell%num_positional |
| 570 | var_len = len_trim(adjustl(temp_value)) |
| 571 | return |
| 572 | case ('0') |
| 573 | var_len = len_trim(shell%shell_name) |
| 574 | return |
| 575 | case ('$') |
| 576 | write(temp_value, '(i0)') shell%shell_pid |
| 577 | var_len = len_trim(temp_value) |
| 578 | return |
| 579 | case ('PPID') |
| 580 | write(temp_value, '(i15)') shell%parent_pid |
| 581 | var_len = len_trim(adjustl(temp_value)) |
| 582 | return |
| 583 | case ('UID') |
| 584 | write(temp_value, '(i15)') shell%uid |
| 585 | var_len = len_trim(adjustl(temp_value)) |
| 586 | return |
| 587 | case ('EUID') |
| 588 | write(temp_value, '(i15)') shell%euid |
| 589 | var_len = len_trim(adjustl(temp_value)) |
| 590 | return |
| 591 | case ('SECONDS') |
| 592 | var_len = 10 ! Max digits for seconds |
| 593 | return |
| 594 | case ('RANDOM') |
| 595 | var_len = 5 ! Max digits for RANDOM (0-32767) |
| 596 | return |
| 597 | case ('LINENO') |
| 598 | write(temp_value, '(i15)') shell%current_line_number |
| 599 | var_len = len_trim(adjustl(temp_value)) |
| 600 | return |
| 601 | case ('HISTFILE') |
| 602 | var_len = len_trim(shell%histfile) |
| 603 | return |
| 604 | case ('HISTSIZE') |
| 605 | write(temp_value, '(i15)') shell%histsize |
| 606 | var_len = len_trim(adjustl(temp_value)) |
| 607 | return |
| 608 | case ('HISTFILESIZE') |
| 609 | write(temp_value, '(i15)') shell%histfilesize |
| 610 | var_len = len_trim(adjustl(temp_value)) |
| 611 | return |
| 612 | case ('HISTCONTROL') |
| 613 | var_len = len_trim(shell%histcontrol) |
| 614 | return |
| 615 | ! Note: No case default here - fall through to regular variable handling |
| 616 | end select |
| 617 | |
| 618 | ! Handle regular shell variables |
| 619 | do i = 1, shell%num_variables |
| 620 | if (trim(shell%variables(i)%name) == trim(name)) then |
| 621 | ! Use value_len to preserve trailing whitespace |
| 622 | if (shell%variables(i)%value_len > 0) then |
| 623 | var_len = shell%variables(i)%value_len |
| 624 | else |
| 625 | var_len = len_trim(shell%variables(i)%value) |
| 626 | end if |
| 627 | return |
| 628 | end if |
| 629 | end do |
| 630 | |
| 631 | ! Check environment variables |
| 632 | block |
| 633 | character(len=:), allocatable :: env_val |
| 634 | env_val = get_environment_var(trim(name)) |
| 635 | if (allocated(env_val) .and. len(env_val) > 0) then |
| 636 | var_len = len(env_val) |
| 637 | return |
| 638 | end if |
| 639 | end block |
| 640 | |
| 641 | ! Not found - return 0 |
| 642 | var_len = 0 |
| 643 | end function |
| 644 | |
| 645 | function is_assignment(input_line) result(is_assign) |
| 646 | character(len=*), intent(in) :: input_line |
| 647 | logical :: is_assign |
| 648 | integer :: eq_pos |
| 649 | |
| 650 | eq_pos = index(input_line, '=') |
| 651 | is_assign = (eq_pos > 1 .and. eq_pos < len_trim(input_line)) |
| 652 | end function |
| 653 | |
| 654 | subroutine handle_assignment(shell, input_line) |
| 655 | type(shell_state_t), intent(inout) :: shell |
| 656 | character(len=*), intent(in) :: input_line |
| 657 | integer :: eq_pos, bracket_pos, bracket_end, array_index, read_status |
| 658 | integer :: actual_value_len, i |
| 659 | character(len=256) :: var_name, index_str |
| 660 | character(len=:), allocatable :: var_value |
| 661 | character(len=:), allocatable :: expanded_value |
| 662 | character(len=1) :: quote_char_temp |
| 663 | |
| 664 | eq_pos = index(input_line, '=') |
| 665 | if (eq_pos > 1) then |
| 666 | var_name = input_line(:eq_pos-1) |
| 667 | var_value = input_line(eq_pos+1:) |
| 668 | |
| 669 | ! Calculate actual content length BEFORE stripping quotes (to preserve trailing spaces) |
| 670 | actual_value_len = len_trim(var_value) |
| 671 | if (actual_value_len >= 2) then |
| 672 | if (var_value(1:1) == "'" .or. var_value(1:1) == '"') then |
| 673 | ! Find closing quote position by searching backwards |
| 674 | quote_char_temp = var_value(1:1) |
| 675 | do i = actual_value_len, 2, -1 |
| 676 | if (var_value(i:i) == quote_char_temp) then |
| 677 | ! Content length is closing_quote_pos - 2 |
| 678 | actual_value_len = i - 2 |
| 679 | exit |
| 680 | end if |
| 681 | end do |
| 682 | else |
| 683 | ! No quotes, use len_trim |
| 684 | actual_value_len = len_trim(var_value) |
| 685 | end if |
| 686 | else |
| 687 | actual_value_len = len_trim(var_value) |
| 688 | end if |
| 689 | |
| 690 | ! Strip surrounding quotes from value |
| 691 | call strip_quotes(var_value) |
| 692 | |
| 693 | ! Check for indexed/associative array assignment: arr[index]=value or map[key]=value |
| 694 | bracket_pos = index(var_name, '[') |
| 695 | if (bracket_pos > 0) then |
| 696 | ! arr[index]=value or map[key]=value |
| 697 | bracket_end = index(var_name(bracket_pos:), ']') |
| 698 | if (bracket_end > 0) then |
| 699 | bracket_end = bracket_pos + bracket_end - 1 |
| 700 | index_str = var_name(bracket_pos+1:bracket_end-1) |
| 701 | var_name = var_name(:bracket_pos-1) |
| 702 | |
| 703 | ! Strip quotes and lexer sentinel chars from array key |
| 704 | call strip_quotes(index_str) |
| 705 | block |
| 706 | character(len=100) :: clean_key |
| 707 | integer :: ci, co |
| 708 | co = 0 |
| 709 | clean_key = '' |
| 710 | do ci = 1, len_trim(index_str) |
| 711 | if (ichar(index_str(ci:ci)) > 3) then |
| 712 | co = co + 1 |
| 713 | clean_key(co:co) = index_str(ci:ci) |
| 714 | end if |
| 715 | end do |
| 716 | index_str = clean_key |
| 717 | end block |
| 718 | |
| 719 | ! Check if this is an associative array |
| 720 | if (is_associative_array(shell, trim(var_name))) then |
| 721 | ! Associative array: use key as-is |
| 722 | call set_assoc_array_value(shell, trim(var_name), trim(index_str), trim(var_value)) |
| 723 | shell%last_exit_status = 0 |
| 724 | else |
| 725 | ! Try to parse as numeric index for indexed array |
| 726 | read(index_str, *, iostat=read_status) array_index |
| 727 | if (read_status == 0) then |
| 728 | ! Valid numeric index |
| 729 | array_index = array_index + 1 ! Convert to 1-indexed |
| 730 | call set_array_element(shell, trim(var_name), array_index, trim(var_value)) |
| 731 | shell%last_exit_status = 0 |
| 732 | else |
| 733 | ! Non-numeric index for non-associative array - error or treat as associative |
| 734 | call set_assoc_array_value(shell, trim(var_name), trim(index_str), trim(var_value)) |
| 735 | shell%last_exit_status = 0 |
| 736 | end if |
| 737 | end if |
| 738 | else |
| 739 | shell%last_exit_status = 1 |
| 740 | end if |
| 741 | return |
| 742 | end if |
| 743 | |
| 744 | ! Check for array literal assignment: var=(value1 value2 value3) |
| 745 | if (len_trim(var_value) > 2 .and. var_value(1:1) == '(' .and. & |
| 746 | var_value(len_trim(var_value):len_trim(var_value)) == ')') then |
| 747 | call handle_array_assignment(shell, trim(var_name), var_value) |
| 748 | else |
| 749 | ! Simple variable expansion during assignment |
| 750 | ! Check if value needs expansion (contains $ or ~) |
| 751 | if (index(var_value, '$') > 0 .or. index(var_value, '~') > 0) then |
| 752 | ! Needs expansion |
| 753 | call simple_expand_variables(var_value, expanded_value, shell) |
| 754 | ! For expanded values, use the allocated length |
| 755 | call set_shell_variable(shell, trim(var_name), expanded_value, len(expanded_value)) |
| 756 | else |
| 757 | ! No expansion needed, preserve trailing spaces |
| 758 | call set_shell_variable(shell, trim(var_name), var_value, actual_value_len) |
| 759 | end if |
| 760 | end if |
| 761 | ! Set exit status to 0 for successful assignments |
| 762 | ! Don't overwrite error codes like 1 (readonly violation) |
| 763 | if (shell%last_exit_status /= 1) then |
| 764 | shell%last_exit_status = 0 |
| 765 | end if |
| 766 | else |
| 767 | shell%last_exit_status = 1 |
| 768 | end if |
| 769 | end subroutine |
| 770 | |
| 771 | subroutine handle_array_assignment(shell, var_name, array_expr) |
| 772 | type(shell_state_t), intent(inout) :: shell |
| 773 | character(len=*), intent(in) :: var_name, array_expr |
| 774 | ! Use allocatable array to avoid static storage |
| 775 | type(string_t), allocatable :: values(:) |
| 776 | integer :: count, start_pos, pos, capacity |
| 777 | character(len=:), allocatable :: content |
| 778 | logical :: in_quotes |
| 779 | |
| 780 | ! Remove parentheses |
| 781 | content = array_expr(2:len_trim(array_expr)-1) |
| 782 | |
| 783 | ! Allocate initial array |
| 784 | allocate(values(20)) ! Start with reasonable size |
| 785 | capacity = 20 |
| 786 | count = 0 |
| 787 | pos = 1 |
| 788 | start_pos = 1 |
| 789 | in_quotes = .false. |
| 790 | |
| 791 | ! Parse space-separated values, respecting quotes |
| 792 | do while (pos <= len_trim(content)) |
| 793 | if (content(pos:pos) == '"' .or. content(pos:pos) == "'") then |
| 794 | in_quotes = .not. in_quotes |
| 795 | else if ((content(pos:pos) == ' ' .or. content(pos:pos) == char(10) .or. & |
| 796 | content(pos:pos) == char(9)) .and. .not. in_quotes) then |
| 797 | if (pos > start_pos) then |
| 798 | count = count + 1 |
| 799 | ! Grow array if needed |
| 800 | if (count > capacity) then |
| 801 | call grow_string_array(values, capacity) |
| 802 | end if |
| 803 | values(count)%str = content(start_pos:pos-1) |
| 804 | ! Remove quotes if present |
| 805 | if (len_trim(values(count)%str) >= 2) then |
| 806 | if ((values(count)%str(1:1) == '"' .and. & |
| 807 | values(count)%str(len_trim(values(count)%str):len_trim(values(count)%str)) == '"') .or. & |
| 808 | (values(count)%str(1:1) == "'" .and. & |
| 809 | values(count)%str(len_trim(values(count)%str):len_trim(values(count)%str)) == "'")) then |
| 810 | values(count)%str = values(count)%str(2:len_trim(values(count)%str)-1) |
| 811 | end if |
| 812 | end if |
| 813 | end if |
| 814 | start_pos = pos + 1 |
| 815 | end if |
| 816 | pos = pos + 1 |
| 817 | end do |
| 818 | |
| 819 | ! Handle last value |
| 820 | if (start_pos <= len_trim(content)) then |
| 821 | count = count + 1 |
| 822 | ! Grow array if needed |
| 823 | if (count > capacity) then |
| 824 | call grow_string_array(values, capacity) |
| 825 | end if |
| 826 | values(count)%str = content(start_pos:) |
| 827 | ! Remove quotes if present |
| 828 | if (len_trim(values(count)%str) >= 2) then |
| 829 | if ((values(count)%str(1:1) == '"' .and. & |
| 830 | values(count)%str(len_trim(values(count)%str):len_trim(values(count)%str)) == '"') .or. & |
| 831 | (values(count)%str(1:1) == "'" .and. & |
| 832 | values(count)%str(len_trim(values(count)%str):len_trim(values(count)%str)) == "'")) then |
| 833 | values(count)%str = values(count)%str(2:len_trim(values(count)%str)-1) |
| 834 | end if |
| 835 | end if |
| 836 | end if |
| 837 | |
| 838 | if (count > 0) then |
| 839 | call set_array_variable_string_t(shell, var_name, values(1:count), count) |
| 840 | end if |
| 841 | |
| 842 | ! Clean up allocatable array |
| 843 | if (allocated(values)) deallocate(values) |
| 844 | end subroutine |
| 845 | |
| 846 | ! Helper subroutine to grow string array |
| 847 | subroutine grow_string_array(array, current_size) |
| 848 | type(string_t), allocatable, intent(inout) :: array(:) |
| 849 | integer, intent(inout) :: current_size |
| 850 | type(string_t), allocatable :: new_array(:) |
| 851 | integer :: new_size, k |
| 852 | |
| 853 | new_size = current_size * 2 |
| 854 | allocate(new_array(new_size)) |
| 855 | |
| 856 | ! Copy existing data |
| 857 | do k = 1, current_size |
| 858 | if (allocated(array(k)%str)) then |
| 859 | new_array(k)%str = array(k)%str |
| 860 | else |
| 861 | new_array(k)%str = '' |
| 862 | end if |
| 863 | end do |
| 864 | |
| 865 | ! Swap arrays |
| 866 | call move_alloc(new_array, array) |
| 867 | current_size = new_size |
| 868 | end subroutine |
| 869 | |
| 870 | subroutine simple_expand_variables(input, expanded, shell) |
| 871 | character(len=*), intent(in) :: input |
| 872 | character(len=:), allocatable, intent(out) :: expanded |
| 873 | type(shell_state_t), intent(inout) :: shell |
| 874 | |
| 875 | character(len=2048) :: result |
| 876 | integer :: i, j, var_start, brace_end |
| 877 | character(len=256) :: var_name |
| 878 | character(len=:), allocatable :: expansion_result, var_value |
| 879 | character(len=:), allocatable :: env_value |
| 880 | |
| 881 | result = '' |
| 882 | i = 1 |
| 883 | j = 1 |
| 884 | |
| 885 | do while (i <= len_trim(input)) |
| 886 | if (input(i:i) == '$' .and. i < len_trim(input)) then |
| 887 | i = i + 1 |
| 888 | |
| 889 | ! Handle ${parameter} expansions |
| 890 | if (i <= len_trim(input) .and. input(i:i) == '{') then |
| 891 | i = i + 1 |
| 892 | brace_end = index(input(i:), '}') |
| 893 | if (brace_end > 0) then |
| 894 | brace_end = brace_end + i - 1 |
| 895 | call expand_parameter(input(i:brace_end-1), expansion_result, shell) |
| 896 | if (len_trim(expansion_result) > 0) then |
| 897 | result(j:j+len_trim(expansion_result)-1) = trim(expansion_result) |
| 898 | j = j + len_trim(expansion_result) |
| 899 | end if |
| 900 | i = brace_end + 1 |
| 901 | else |
| 902 | ! Malformed ${, treat as literal |
| 903 | result(j:j) = '$' |
| 904 | result(j+1:j+1) = '{' |
| 905 | j = j + 2 |
| 906 | end if |
| 907 | else |
| 908 | ! Handle simple $variable expansions |
| 909 | var_start = i |
| 910 | |
| 911 | ! Check for special single-character variables first |
| 912 | if (i <= len_trim(input)) then |
| 913 | select case (input(i:i)) |
| 914 | case ('!', '?', '$', '#', '*', '@', '-', '_', '0') |
| 915 | ! Single-character special variable |
| 916 | var_name = input(i:i) |
| 917 | i = i + 1 |
| 918 | case default |
| 919 | ! Extract alphanumeric variable name |
| 920 | do while (i <= len_trim(input)) |
| 921 | if (.not. (is_alnum(input(i:i)) .or. input(i:i) == '_')) exit |
| 922 | i = i + 1 |
| 923 | end do |
| 924 | var_name = input(var_start:i-1) |
| 925 | end select |
| 926 | else |
| 927 | var_name = '' |
| 928 | end if |
| 929 | |
| 930 | ! Check shell variables first |
| 931 | if (len_trim(var_name) > 0) then |
| 932 | var_value = get_shell_variable(shell, trim(var_name)) |
| 933 | block |
| 934 | integer :: var_len |
| 935 | var_len = get_shell_variable_length(shell, trim(var_name)) |
| 936 | if (var_len > 0) then |
| 937 | ! Use actual length to preserve trailing whitespace |
| 938 | result(j:j+var_len-1) = var_value(1:var_len) |
| 939 | j = j + var_len |
| 940 | else if (len_trim(var_value) > 0) then |
| 941 | ! Fallback for compatibility |
| 942 | result(j:j+len_trim(var_value)-1) = trim(var_value) |
| 943 | j = j + len_trim(var_value) |
| 944 | else |
| 945 | ! Fall back to environment variables (not for special vars) |
| 946 | if (.not. any(var_name == ['!', '?', '$', '#', '*', '@', '-', '_', '0'])) then |
| 947 | env_value = get_environment_var(trim(var_name)) |
| 948 | if (allocated(env_value) .and. len(env_value) > 0) then |
| 949 | result(j:j+len(env_value)-1) = env_value |
| 950 | j = j + len(env_value) |
| 951 | end if |
| 952 | end if |
| 953 | end if |
| 954 | end block |
| 955 | end if |
| 956 | end if |
| 957 | else |
| 958 | result(j:j) = input(i:i) |
| 959 | i = i + 1 |
| 960 | j = j + 1 |
| 961 | end if |
| 962 | end do |
| 963 | |
| 964 | ! Don't use trim() - preserve trailing whitespace |
| 965 | if (j > 1) then |
| 966 | expanded = result(1:j-1) |
| 967 | else |
| 968 | expanded = '' |
| 969 | end if |
| 970 | |
| 971 | contains |
| 972 | function is_alnum(ch) result(res) |
| 973 | character, intent(in) :: ch |
| 974 | logical :: res |
| 975 | res = (ch >= 'a' .and. ch <= 'z') .or. & |
| 976 | (ch >= 'A' .and. ch <= 'Z') .or. & |
| 977 | (ch >= '0' .and. ch <= '9') |
| 978 | end function |
| 979 | end subroutine |
| 980 | |
| 981 | subroutine add_function(shell, name, body_lines, body_count) |
| 982 | type(shell_state_t), intent(inout) :: shell |
| 983 | character(len=*), intent(in) :: name |
| 984 | character(len=*), intent(in) :: body_lines(:) |
| 985 | integer, intent(in) :: body_count |
| 986 | integer :: i, j |
| 987 | |
| 988 | ! Find empty slot or replace existing function |
| 989 | do i = 1, size(shell%functions) |
| 990 | if (trim(shell%functions(i)%name) == trim(name) .or. len_trim(shell%functions(i)%name) == 0) then |
| 991 | shell%functions(i)%name = name |
| 992 | shell%functions(i)%body_lines = body_count |
| 993 | |
| 994 | if (allocated(shell%functions(i)%body)) deallocate(shell%functions(i)%body) |
| 995 | allocate(shell%functions(i)%body(body_count)) |
| 996 | |
| 997 | do j = 1, body_count |
| 998 | shell%functions(i)%body(j)%str = trim(body_lines(j)) |
| 999 | end do |
| 1000 | |
| 1001 | ! Update function count to include this function |
| 1002 | shell%num_functions = max(shell%num_functions, i) |
| 1003 | return |
| 1004 | end if |
| 1005 | end do |
| 1006 | end subroutine |
| 1007 | |
| 1008 | function is_function(shell, name) result(found) |
| 1009 | type(shell_state_t), intent(in) :: shell |
| 1010 | character(len=*), intent(in) :: name |
| 1011 | logical :: found |
| 1012 | integer :: i |
| 1013 | |
| 1014 | found = .false. |
| 1015 | do i = 1, shell%num_functions |
| 1016 | if (trim(shell%functions(i)%name) == trim(name)) then |
| 1017 | found = .true. |
| 1018 | return |
| 1019 | end if |
| 1020 | end do |
| 1021 | end function |
| 1022 | |
| 1023 | function get_function_body(shell, name) result(body) |
| 1024 | type(shell_state_t), intent(in) :: shell |
| 1025 | character(len=*), intent(in) :: name |
| 1026 | type(string_t), allocatable :: body(:) |
| 1027 | integer :: i, j |
| 1028 | |
| 1029 | do i = 1, shell%num_functions |
| 1030 | if (trim(shell%functions(i)%name) == trim(name)) then |
| 1031 | if (allocated(shell%functions(i)%body)) then |
| 1032 | allocate(body(shell%functions(i)%body_lines)) |
| 1033 | do j = 1, shell%functions(i)%body_lines |
| 1034 | body(j)%str = shell%functions(i)%body(j)%str |
| 1035 | end do |
| 1036 | end if |
| 1037 | return |
| 1038 | end if |
| 1039 | end do |
| 1040 | end function |
| 1041 | |
| 1042 | ! Array variable functions |
| 1043 | subroutine set_array_variable(shell, name, values, count) |
| 1044 | type(shell_state_t), intent(inout) :: shell |
| 1045 | character(len=*), intent(in) :: name |
| 1046 | character(len=*), intent(in) :: values(:) |
| 1047 | integer, intent(in) :: count |
| 1048 | integer :: i, k, empty_slot |
| 1049 | |
| 1050 | empty_slot = -1 |
| 1051 | |
| 1052 | ! Check if variable already exists |
| 1053 | do i = 1, shell%num_variables |
| 1054 | if (trim(shell%variables(i)%name) == trim(name)) then |
| 1055 | if (allocated(shell%variables(i)%array_values)) deallocate(shell%variables(i)%array_values) |
| 1056 | allocate(shell%variables(i)%array_values(count)) |
| 1057 | do k = 1, count |
| 1058 | shell%variables(i)%array_values(k)%str = trim(values(k)) |
| 1059 | end do |
| 1060 | shell%variables(i)%array_size = count |
| 1061 | shell%variables(i)%is_array = .true. |
| 1062 | return |
| 1063 | end if |
| 1064 | end do |
| 1065 | |
| 1066 | ! Find empty slot |
| 1067 | do i = 1, size(shell%variables) |
| 1068 | if (shell%variables(i)%name(1:1) == char(0) .or. trim(shell%variables(i)%name) == '') then |
| 1069 | empty_slot = i |
| 1070 | exit |
| 1071 | end if |
| 1072 | end do |
| 1073 | |
| 1074 | ! Add new array variable |
| 1075 | if (empty_slot > 0) then |
| 1076 | shell%variables(empty_slot)%name = name |
| 1077 | shell%variables(empty_slot)%is_array = .true. |
| 1078 | shell%variables(empty_slot)%array_size = count |
| 1079 | if (allocated(shell%variables(empty_slot)%array_values)) deallocate(shell%variables(empty_slot)%array_values) |
| 1080 | allocate(shell%variables(empty_slot)%array_values(count)) |
| 1081 | do k = 1, count |
| 1082 | shell%variables(empty_slot)%array_values(k)%str = trim(values(k)) |
| 1083 | end do |
| 1084 | shell%num_variables = shell%num_variables + 1 |
| 1085 | end if |
| 1086 | end subroutine |
| 1087 | |
| 1088 | subroutine set_array_variable_string_t(shell, name, values, count) |
| 1089 | type(shell_state_t), intent(inout) :: shell |
| 1090 | character(len=*), intent(in) :: name |
| 1091 | type(string_t), intent(in) :: values(:) |
| 1092 | integer, intent(in) :: count |
| 1093 | integer :: i, k, empty_slot |
| 1094 | |
| 1095 | empty_slot = -1 |
| 1096 | |
| 1097 | ! Check if variable already exists |
| 1098 | do i = 1, shell%num_variables |
| 1099 | if (trim(shell%variables(i)%name) == trim(name)) then |
| 1100 | if (allocated(shell%variables(i)%array_values)) deallocate(shell%variables(i)%array_values) |
| 1101 | allocate(shell%variables(i)%array_values(count)) |
| 1102 | do k = 1, count |
| 1103 | shell%variables(i)%array_values(k)%str = values(k)%str |
| 1104 | end do |
| 1105 | shell%variables(i)%array_size = count |
| 1106 | shell%variables(i)%is_array = .true. |
| 1107 | return |
| 1108 | end if |
| 1109 | end do |
| 1110 | |
| 1111 | ! Find empty slot |
| 1112 | do i = 1, size(shell%variables) |
| 1113 | if (shell%variables(i)%name(1:1) == char(0) .or. trim(shell%variables(i)%name) == '') then |
| 1114 | empty_slot = i |
| 1115 | exit |
| 1116 | end if |
| 1117 | end do |
| 1118 | |
| 1119 | ! Add new array variable |
| 1120 | if (empty_slot > 0) then |
| 1121 | shell%variables(empty_slot)%name = name |
| 1122 | shell%variables(empty_slot)%is_array = .true. |
| 1123 | shell%variables(empty_slot)%array_size = count |
| 1124 | if (allocated(shell%variables(empty_slot)%array_values)) deallocate(shell%variables(empty_slot)%array_values) |
| 1125 | allocate(shell%variables(empty_slot)%array_values(count)) |
| 1126 | do k = 1, count |
| 1127 | shell%variables(empty_slot)%array_values(k)%str = values(k)%str |
| 1128 | end do |
| 1129 | shell%num_variables = shell%num_variables + 1 |
| 1130 | end if |
| 1131 | end subroutine |
| 1132 | |
| 1133 | ! Set a single element in an array at the given index (1-indexed) |
| 1134 | subroutine set_array_element(shell, name, index, value) |
| 1135 | type(shell_state_t), intent(inout) :: shell |
| 1136 | character(len=*), intent(in) :: name |
| 1137 | integer, intent(in) :: index |
| 1138 | character(len=*), intent(in) :: value |
| 1139 | integer :: i, k, empty_slot, new_size |
| 1140 | type(string_t), allocatable :: temp_array(:) |
| 1141 | |
| 1142 | ! Check if variable already exists |
| 1143 | do i = 1, shell%num_variables |
| 1144 | if (trim(shell%variables(i)%name) == trim(name)) then |
| 1145 | ! Variable exists - make sure it's an array |
| 1146 | if (.not. shell%variables(i)%is_array) then |
| 1147 | ! Convert to array |
| 1148 | shell%variables(i)%is_array = .true. |
| 1149 | if (allocated(shell%variables(i)%array_values)) deallocate(shell%variables(i)%array_values) |
| 1150 | allocate(shell%variables(i)%array_values(index)) |
| 1151 | do k = 1, index |
| 1152 | shell%variables(i)%array_values(k)%str = '' |
| 1153 | end do |
| 1154 | shell%variables(i)%array_size = index |
| 1155 | else if (.not. allocated(shell%variables(i)%array_values)) then |
| 1156 | ! Array exists but not allocated (from declare -a) |
| 1157 | allocate(shell%variables(i)%array_values(index)) |
| 1158 | do k = 1, index |
| 1159 | shell%variables(i)%array_values(k)%str = '' |
| 1160 | end do |
| 1161 | shell%variables(i)%array_size = index |
| 1162 | else if (index > shell%variables(i)%array_size) then |
| 1163 | ! Need to expand the array (sparse array support) |
| 1164 | new_size = index |
| 1165 | allocate(temp_array(new_size)) |
| 1166 | do k = 1, new_size |
| 1167 | temp_array(k)%str = '' |
| 1168 | end do |
| 1169 | if (shell%variables(i)%array_size > 0 .and. allocated(shell%variables(i)%array_values)) then |
| 1170 | do k = 1, shell%variables(i)%array_size |
| 1171 | temp_array(k)%str = shell%variables(i)%array_values(k)%str |
| 1172 | end do |
| 1173 | end if |
| 1174 | if (allocated(shell%variables(i)%array_values)) deallocate(shell%variables(i)%array_values) |
| 1175 | allocate(shell%variables(i)%array_values(new_size)) |
| 1176 | do k = 1, new_size |
| 1177 | shell%variables(i)%array_values(k)%str = temp_array(k)%str |
| 1178 | end do |
| 1179 | shell%variables(i)%array_size = new_size |
| 1180 | deallocate(temp_array) |
| 1181 | end if |
| 1182 | |
| 1183 | ! Set the element |
| 1184 | shell%variables(i)%array_values(index)%str = value |
| 1185 | return |
| 1186 | end if |
| 1187 | end do |
| 1188 | |
| 1189 | ! Variable doesn't exist - create new array |
| 1190 | empty_slot = -1 |
| 1191 | do i = 1, size(shell%variables) |
| 1192 | if (shell%variables(i)%name(1:1) == char(0) .or. trim(shell%variables(i)%name) == '') then |
| 1193 | empty_slot = i |
| 1194 | exit |
| 1195 | end if |
| 1196 | end do |
| 1197 | |
| 1198 | if (empty_slot > 0) then |
| 1199 | shell%variables(empty_slot)%name = name |
| 1200 | shell%variables(empty_slot)%is_array = .true. |
| 1201 | shell%variables(empty_slot)%array_size = index |
| 1202 | allocate(shell%variables(empty_slot)%array_values(index)) |
| 1203 | do k = 1, index |
| 1204 | shell%variables(empty_slot)%array_values(k)%str = '' |
| 1205 | end do |
| 1206 | shell%variables(empty_slot)%array_values(index)%str = value |
| 1207 | shell%num_variables = shell%num_variables + 1 |
| 1208 | end if |
| 1209 | end subroutine |
| 1210 | |
| 1211 | function get_array_element(shell, name, index) result(value) |
| 1212 | type(shell_state_t), intent(in) :: shell |
| 1213 | character(len=*), intent(in) :: name |
| 1214 | integer, intent(in) :: index |
| 1215 | character(len=:), allocatable :: value |
| 1216 | integer :: i, actual_index |
| 1217 | |
| 1218 | value = '' |
| 1219 | |
| 1220 | do i = 1, shell%num_variables |
| 1221 | if (trim(shell%variables(i)%name) == trim(name) .and. shell%variables(i)%is_array) then |
| 1222 | actual_index = index |
| 1223 | ! Bash: negative indices count from end (-1 = last element) |
| 1224 | if (actual_index < 0) then |
| 1225 | actual_index = shell%variables(i)%array_size + actual_index + 1 |
| 1226 | end if |
| 1227 | if (actual_index >= 1 .and. actual_index <= shell%variables(i)%array_size) then |
| 1228 | value = shell%variables(i)%array_values(actual_index)%str |
| 1229 | end if |
| 1230 | return |
| 1231 | end if |
| 1232 | end do |
| 1233 | end function |
| 1234 | |
| 1235 | function get_array_all_elements(shell, name) result(result_str) |
| 1236 | type(shell_state_t), intent(in) :: shell |
| 1237 | character(len=*), intent(in) :: name |
| 1238 | character(len=4096) :: result_str |
| 1239 | integer :: i, j, pos |
| 1240 | logical :: first |
| 1241 | |
| 1242 | result_str = '' |
| 1243 | pos = 1 |
| 1244 | first = .true. |
| 1245 | |
| 1246 | do i = 1, shell%num_variables |
| 1247 | if (trim(shell%variables(i)%name) == trim(name) .and. shell%variables(i)%is_array) then |
| 1248 | do j = 1, shell%variables(i)%array_size |
| 1249 | if (.not. allocated(shell%variables(i)%array_values(j)%str)) cycle |
| 1250 | if (len_trim(shell%variables(i)%array_values(j)%str) == 0) cycle |
| 1251 | if (.not. first) then |
| 1252 | result_str(pos:pos) = ' ' |
| 1253 | pos = pos + 1 |
| 1254 | end if |
| 1255 | first = .false. |
| 1256 | result_str(pos:pos+len_trim(shell%variables(i)%array_values(j)%str)-1) = & |
| 1257 | trim(shell%variables(i)%array_values(j)%str) |
| 1258 | pos = pos + len_trim(shell%variables(i)%array_values(j)%str) |
| 1259 | end do |
| 1260 | return |
| 1261 | end if |
| 1262 | end do |
| 1263 | end function |
| 1264 | |
| 1265 | function get_array_size(shell, name) result(size) |
| 1266 | type(shell_state_t), intent(in) :: shell |
| 1267 | character(len=*), intent(in) :: name |
| 1268 | integer :: size |
| 1269 | integer :: i |
| 1270 | |
| 1271 | size = 0 |
| 1272 | |
| 1273 | do i = 1, shell%num_variables |
| 1274 | if (trim(shell%variables(i)%name) == trim(name) .and. shell%variables(i)%is_array) then |
| 1275 | size = shell%variables(i)%array_size |
| 1276 | return |
| 1277 | end if |
| 1278 | end do |
| 1279 | end function |
| 1280 | |
| 1281 | subroutine declare_associative_array(shell, name) |
| 1282 | type(shell_state_t), intent(inout) :: shell |
| 1283 | character(len=*), intent(in) :: name |
| 1284 | |
| 1285 | integer :: i, empty_slot |
| 1286 | |
| 1287 | empty_slot = -1 |
| 1288 | |
| 1289 | ! Check if variable already exists |
| 1290 | do i = 1, shell%num_variables |
| 1291 | if (trim(shell%variables(i)%name) == trim(name)) then |
| 1292 | ! Convert to associative array |
| 1293 | shell%variables(i)%is_assoc_array = .true. |
| 1294 | shell%variables(i)%is_array = .false. |
| 1295 | if (.not. allocated(shell%variables(i)%assoc_entries)) then |
| 1296 | allocate(shell%variables(i)%assoc_entries(50)) ! Initial size |
| 1297 | end if |
| 1298 | shell%variables(i)%assoc_size = 0 |
| 1299 | return |
| 1300 | end if |
| 1301 | end do |
| 1302 | |
| 1303 | ! Find empty slot |
| 1304 | do i = 1, size(shell%variables) |
| 1305 | if (shell%variables(i)%name(1:1) == char(0) .or. trim(shell%variables(i)%name) == '') then |
| 1306 | empty_slot = i |
| 1307 | exit |
| 1308 | end if |
| 1309 | end do |
| 1310 | |
| 1311 | ! Add new associative array variable |
| 1312 | if (empty_slot > 0) then |
| 1313 | shell%variables(empty_slot)%name = name |
| 1314 | shell%variables(empty_slot)%value = '' |
| 1315 | shell%variables(empty_slot)%is_assoc_array = .true. |
| 1316 | shell%variables(empty_slot)%is_array = .false. |
| 1317 | allocate(shell%variables(empty_slot)%assoc_entries(50)) |
| 1318 | shell%variables(empty_slot)%assoc_size = 0 |
| 1319 | shell%num_variables = shell%num_variables + 1 |
| 1320 | else |
| 1321 | write(error_unit, '(a)') 'declare: too many variables defined' |
| 1322 | end if |
| 1323 | end subroutine |
| 1324 | |
| 1325 | subroutine set_assoc_array_value(shell, array_name, key, value) |
| 1326 | type(shell_state_t), intent(inout) :: shell |
| 1327 | character(len=*), intent(in) :: array_name, key, value |
| 1328 | |
| 1329 | integer :: i, j |
| 1330 | |
| 1331 | ! Find the associative array variable |
| 1332 | do i = 1, shell%num_variables |
| 1333 | if (trim(shell%variables(i)%name) == trim(array_name) .and. & |
| 1334 | shell%variables(i)%is_assoc_array) then |
| 1335 | |
| 1336 | ! Check if key already exists |
| 1337 | do j = 1, shell%variables(i)%assoc_size |
| 1338 | if (trim(shell%variables(i)%assoc_entries(j)%key) == trim(key)) then |
| 1339 | call safe_assign_alloc_str(shell%variables(i)%assoc_entries(j)%value, & |
| 1340 | value, len_trim(value)) |
| 1341 | return |
| 1342 | end if |
| 1343 | end do |
| 1344 | |
| 1345 | ! Add new key-value pair — grow array if needed |
| 1346 | if (shell%variables(i)%assoc_size >= size(shell%variables(i)%assoc_entries)) then |
| 1347 | block |
| 1348 | type(assoc_array_entry_t), allocatable :: new_entries(:) |
| 1349 | integer :: old_size, new_size, k |
| 1350 | old_size = size(shell%variables(i)%assoc_entries) |
| 1351 | new_size = old_size * 2 |
| 1352 | allocate(new_entries(new_size)) |
| 1353 | do k = 1, old_size |
| 1354 | new_entries(k)%key = shell%variables(i)%assoc_entries(k)%key |
| 1355 | call safe_assign_alloc_str(new_entries(k)%value, & |
| 1356 | shell%variables(i)%assoc_entries(k)%value, & |
| 1357 | len_trim(shell%variables(i)%assoc_entries(k)%value)) |
| 1358 | end do |
| 1359 | call move_alloc(new_entries, shell%variables(i)%assoc_entries) |
| 1360 | end block |
| 1361 | end if |
| 1362 | shell%variables(i)%assoc_size = shell%variables(i)%assoc_size + 1 |
| 1363 | shell%variables(i)%assoc_entries(shell%variables(i)%assoc_size)%key = key |
| 1364 | call safe_assign_alloc_str( & |
| 1365 | shell%variables(i)%assoc_entries(shell%variables(i)%assoc_size)%value, & |
| 1366 | value, len_trim(value)) |
| 1367 | return |
| 1368 | end if |
| 1369 | end do |
| 1370 | |
| 1371 | write(error_unit, '(a)') 'associative array: ' // trim(array_name) // ' not declared' |
| 1372 | end subroutine |
| 1373 | |
| 1374 | function get_assoc_array_value(shell, array_name, key) result(value) |
| 1375 | type(shell_state_t), intent(in) :: shell |
| 1376 | character(len=*), intent(in) :: array_name, key |
| 1377 | character(len=:), allocatable :: value |
| 1378 | |
| 1379 | integer :: i, j |
| 1380 | |
| 1381 | value = '' |
| 1382 | |
| 1383 | ! Find the associative array variable |
| 1384 | do i = 1, shell%num_variables |
| 1385 | if (trim(shell%variables(i)%name) == trim(array_name) .and. & |
| 1386 | shell%variables(i)%is_assoc_array) then |
| 1387 | |
| 1388 | ! Find the key |
| 1389 | do j = 1, shell%variables(i)%assoc_size |
| 1390 | if (trim(shell%variables(i)%assoc_entries(j)%key) == trim(key)) then |
| 1391 | value = shell%variables(i)%assoc_entries(j)%value |
| 1392 | return |
| 1393 | end if |
| 1394 | end do |
| 1395 | return ! Key not found, return empty string |
| 1396 | end if |
| 1397 | end do |
| 1398 | end function |
| 1399 | |
| 1400 | subroutine get_assoc_array_keys(shell, array_name, keys, num_keys) |
| 1401 | type(shell_state_t), intent(in) :: shell |
| 1402 | character(len=*), intent(in) :: array_name |
| 1403 | character(len=256), intent(out) :: keys(:) |
| 1404 | integer, intent(out) :: num_keys |
| 1405 | |
| 1406 | integer :: i, j |
| 1407 | |
| 1408 | num_keys = 0 |
| 1409 | |
| 1410 | ! Find the associative array variable |
| 1411 | do i = 1, shell%num_variables |
| 1412 | if (trim(shell%variables(i)%name) == trim(array_name) .and. & |
| 1413 | shell%variables(i)%is_assoc_array) then |
| 1414 | |
| 1415 | num_keys = min(shell%variables(i)%assoc_size, size(keys)) |
| 1416 | do j = 1, num_keys |
| 1417 | keys(j) = shell%variables(i)%assoc_entries(j)%key |
| 1418 | end do |
| 1419 | return |
| 1420 | end if |
| 1421 | end do |
| 1422 | end subroutine |
| 1423 | |
| 1424 | subroutine unset_assoc_array_key(shell, array_name, key) |
| 1425 | type(shell_state_t), intent(inout) :: shell |
| 1426 | character(len=*), intent(in) :: array_name, key |
| 1427 | integer :: i, j, k |
| 1428 | |
| 1429 | do i = 1, shell%num_variables |
| 1430 | if (trim(shell%variables(i)%name) == trim(array_name) .and. & |
| 1431 | shell%variables(i)%is_assoc_array) then |
| 1432 | do j = 1, shell%variables(i)%assoc_size |
| 1433 | if (trim(shell%variables(i)%assoc_entries(j)%key) == trim(key)) then |
| 1434 | ! Shift remaining entries down |
| 1435 | do k = j, shell%variables(i)%assoc_size - 1 |
| 1436 | shell%variables(i)%assoc_entries(k) = & |
| 1437 | shell%variables(i)%assoc_entries(k+1) |
| 1438 | end do |
| 1439 | shell%variables(i)%assoc_size = & |
| 1440 | shell%variables(i)%assoc_size - 1 |
| 1441 | return |
| 1442 | end if |
| 1443 | end do |
| 1444 | return |
| 1445 | end if |
| 1446 | end do |
| 1447 | end subroutine |
| 1448 | |
| 1449 | function is_associative_array(shell, name) result(is_assoc) |
| 1450 | type(shell_state_t), intent(in) :: shell |
| 1451 | character(len=*), intent(in) :: name |
| 1452 | logical :: is_assoc |
| 1453 | |
| 1454 | integer :: i |
| 1455 | |
| 1456 | is_assoc = .false. |
| 1457 | do i = 1, shell%num_variables |
| 1458 | if (trim(shell%variables(i)%name) == trim(name)) then |
| 1459 | is_assoc = shell%variables(i)%is_assoc_array |
| 1460 | return |
| 1461 | end if |
| 1462 | end do |
| 1463 | end function |
| 1464 | |
| 1465 | ! POSIX parameter expansion implementation |
| 1466 | subroutine expand_parameter(param_expr, result, shell) |
| 1467 | character(len=*), intent(in) :: param_expr |
| 1468 | character(len=:), allocatable, intent(out) :: result |
| 1469 | type(shell_state_t), intent(inout) :: shell |
| 1470 | |
| 1471 | character(len=256) :: param_name, default_value |
| 1472 | character(len=:), allocatable :: var_value |
| 1473 | character(len=:), allocatable :: expanded_pattern_buf |
| 1474 | integer :: colon_pos, dash_pos, plus_pos, eq_pos, question_pos |
| 1475 | integer :: percent_pos, hash_pos, percent2_pos, hash2_pos |
| 1476 | logical :: has_colon |
| 1477 | |
| 1478 | result = '' |
| 1479 | |
| 1480 | ! Check for various POSIX parameter expansion forms |
| 1481 | colon_pos = index(param_expr, ':') |
| 1482 | has_colon = colon_pos > 0 |
| 1483 | |
| 1484 | ! ${parameter:-word} or ${parameter-word} |
| 1485 | if (has_colon) then |
| 1486 | dash_pos = index(param_expr(colon_pos:), '-') |
| 1487 | if (dash_pos > 0) then |
| 1488 | dash_pos = dash_pos + colon_pos - 1 |
| 1489 | param_name = param_expr(:colon_pos-1) |
| 1490 | default_value = param_expr(dash_pos+1:) |
| 1491 | end if |
| 1492 | else |
| 1493 | dash_pos = index(param_expr, '-') |
| 1494 | if (dash_pos > 0) then |
| 1495 | param_name = param_expr(:dash_pos-1) |
| 1496 | default_value = param_expr(dash_pos+1:) |
| 1497 | end if |
| 1498 | end if |
| 1499 | |
| 1500 | if (dash_pos > 0) then |
| 1501 | var_value = get_shell_variable(shell, trim(param_name)) |
| 1502 | if (has_colon) then |
| 1503 | ! ${parameter:-word} - use default if unset or null |
| 1504 | if (len_trim(var_value) == 0) then |
| 1505 | result = trim(default_value) |
| 1506 | else |
| 1507 | result = trim(var_value) |
| 1508 | end if |
| 1509 | else |
| 1510 | ! ${parameter-word} - use default if unset only |
| 1511 | if (len_trim(var_value) == 0 .and. .not. variable_exists(shell, trim(param_name))) then |
| 1512 | result = trim(default_value) |
| 1513 | else |
| 1514 | result = trim(var_value) |
| 1515 | end if |
| 1516 | end if |
| 1517 | return |
| 1518 | end if |
| 1519 | |
| 1520 | ! ${parameter:=word} or ${parameter=word} |
| 1521 | if (has_colon) then |
| 1522 | eq_pos = index(param_expr(colon_pos:), '=') |
| 1523 | if (eq_pos > 0) then |
| 1524 | eq_pos = eq_pos + colon_pos - 1 |
| 1525 | param_name = param_expr(:colon_pos-1) |
| 1526 | default_value = param_expr(eq_pos+1:) |
| 1527 | end if |
| 1528 | else |
| 1529 | eq_pos = index(param_expr, '=') |
| 1530 | if (eq_pos > 0) then |
| 1531 | param_name = param_expr(:eq_pos-1) |
| 1532 | default_value = param_expr(eq_pos+1:) |
| 1533 | end if |
| 1534 | end if |
| 1535 | |
| 1536 | if (eq_pos > 0) then |
| 1537 | var_value = get_shell_variable(shell, trim(param_name)) |
| 1538 | if (has_colon) then |
| 1539 | ! ${parameter:=word} - assign default if unset or null |
| 1540 | if (len_trim(var_value) == 0) then |
| 1541 | call set_shell_variable(shell, trim(param_name), trim(default_value)) |
| 1542 | result = trim(default_value) |
| 1543 | else |
| 1544 | result = trim(var_value) |
| 1545 | end if |
| 1546 | else |
| 1547 | ! ${parameter=word} - assign default if unset only |
| 1548 | if (len_trim(var_value) == 0 .and. .not. variable_exists(shell, trim(param_name))) then |
| 1549 | call set_shell_variable(shell, trim(param_name), trim(default_value)) |
| 1550 | result = trim(default_value) |
| 1551 | else |
| 1552 | result = trim(var_value) |
| 1553 | end if |
| 1554 | end if |
| 1555 | return |
| 1556 | end if |
| 1557 | |
| 1558 | ! ${parameter:?word} or ${parameter?word} |
| 1559 | if (has_colon) then |
| 1560 | question_pos = index(param_expr(colon_pos:), '?') |
| 1561 | if (question_pos > 0) then |
| 1562 | question_pos = question_pos + colon_pos - 1 |
| 1563 | param_name = param_expr(:colon_pos-1) |
| 1564 | default_value = param_expr(question_pos+1:) |
| 1565 | end if |
| 1566 | else |
| 1567 | question_pos = index(param_expr, '?') |
| 1568 | if (question_pos > 0) then |
| 1569 | param_name = param_expr(:question_pos-1) |
| 1570 | default_value = param_expr(question_pos+1:) |
| 1571 | end if |
| 1572 | end if |
| 1573 | |
| 1574 | if (question_pos > 0) then |
| 1575 | var_value = get_shell_variable(shell, trim(param_name)) |
| 1576 | if (has_colon) then |
| 1577 | ! ${parameter:?word} - error if unset or null |
| 1578 | if (len_trim(var_value) == 0) then |
| 1579 | ! TODO: Should write error and exit |
| 1580 | result = trim(param_name) // ': ' // trim(default_value) |
| 1581 | else |
| 1582 | result = trim(var_value) |
| 1583 | end if |
| 1584 | else |
| 1585 | ! ${parameter?word} - error if unset only |
| 1586 | if (len_trim(var_value) == 0 .and. .not. variable_exists(shell, trim(param_name))) then |
| 1587 | ! TODO: Should write error and exit |
| 1588 | result = trim(param_name) // ': ' // trim(default_value) |
| 1589 | else |
| 1590 | result = trim(var_value) |
| 1591 | end if |
| 1592 | end if |
| 1593 | return |
| 1594 | end if |
| 1595 | |
| 1596 | ! ${parameter:+word} or ${parameter+word} |
| 1597 | if (has_colon) then |
| 1598 | plus_pos = index(param_expr(colon_pos:), '+') |
| 1599 | if (plus_pos > 0) then |
| 1600 | plus_pos = plus_pos + colon_pos - 1 |
| 1601 | param_name = param_expr(:colon_pos-1) |
| 1602 | default_value = param_expr(plus_pos+1:) |
| 1603 | end if |
| 1604 | else |
| 1605 | plus_pos = index(param_expr, '+') |
| 1606 | if (plus_pos > 0) then |
| 1607 | param_name = param_expr(:plus_pos-1) |
| 1608 | default_value = param_expr(plus_pos+1:) |
| 1609 | end if |
| 1610 | end if |
| 1611 | |
| 1612 | if (plus_pos > 0) then |
| 1613 | var_value = get_shell_variable(shell, trim(param_name)) |
| 1614 | if (has_colon) then |
| 1615 | ! ${parameter:+word} - use word if set and not null |
| 1616 | if (len_trim(var_value) > 0) then |
| 1617 | result = trim(default_value) |
| 1618 | else |
| 1619 | result = '' |
| 1620 | end if |
| 1621 | else |
| 1622 | ! ${parameter+word} - use word if set |
| 1623 | if (variable_exists(shell, trim(param_name))) then |
| 1624 | result = trim(default_value) |
| 1625 | else |
| 1626 | result = '' |
| 1627 | end if |
| 1628 | end if |
| 1629 | return |
| 1630 | end if |
| 1631 | |
| 1632 | ! ${parameter%word} - remove smallest suffix pattern |
| 1633 | percent_pos = index(param_expr, '%', back=.true.) |
| 1634 | if (percent_pos > 0 .and. param_expr(percent_pos-1:percent_pos-1) /= '%') then |
| 1635 | param_name = param_expr(:percent_pos-1) |
| 1636 | default_value = param_expr(percent_pos+1:) |
| 1637 | var_value = get_shell_variable(shell, trim(param_name)) |
| 1638 | ! Expand simple $var in pattern |
| 1639 | expanded_pattern_buf = default_value |
| 1640 | if (index(default_value, '$') == 1) then |
| 1641 | ! Simple $var expansion (not ${} or $()) |
| 1642 | if (len_trim(default_value) >= 2) then |
| 1643 | if (default_value(2:2) /= '{' .and. default_value(2:2) /= '(') then |
| 1644 | expanded_pattern_buf = get_shell_variable(shell, trim(default_value(2:))) |
| 1645 | end if |
| 1646 | end if |
| 1647 | end if |
| 1648 | call remove_suffix_pattern(trim(var_value), trim(expanded_pattern_buf), result, .false.) |
| 1649 | return |
| 1650 | end if |
| 1651 | |
| 1652 | ! ${parameter%%word} - remove largest suffix pattern |
| 1653 | percent2_pos = index(param_expr, '%%') |
| 1654 | if (percent2_pos > 0) then |
| 1655 | param_name = param_expr(:percent2_pos-1) |
| 1656 | default_value = param_expr(percent2_pos+2:) |
| 1657 | var_value = get_shell_variable(shell, trim(param_name)) |
| 1658 | ! Expand simple $var in pattern |
| 1659 | if (len_trim(default_value) > 1 .and. default_value(1:1) == '$' .and. & |
| 1660 | default_value(2:2) /= '{' .and. default_value(2:2) /= '(') then |
| 1661 | expanded_pattern_buf = get_shell_variable(shell, trim(default_value(2:))) |
| 1662 | else |
| 1663 | expanded_pattern_buf = default_value |
| 1664 | end if |
| 1665 | call remove_suffix_pattern(trim(var_value), trim(expanded_pattern_buf), result, .true.) |
| 1666 | return |
| 1667 | end if |
| 1668 | |
| 1669 | ! ${parameter#word} - remove smallest prefix pattern |
| 1670 | hash_pos = index(param_expr, '#') |
| 1671 | if (hash_pos > 0 .and. param_expr(hash_pos:hash_pos+1) /= '##') then |
| 1672 | param_name = param_expr(:hash_pos-1) |
| 1673 | default_value = param_expr(hash_pos+1:) |
| 1674 | var_value = get_shell_variable(shell, trim(param_name)) |
| 1675 | ! Expand simple $var in pattern |
| 1676 | if (len_trim(default_value) > 1 .and. default_value(1:1) == '$' .and. & |
| 1677 | default_value(2:2) /= '{' .and. default_value(2:2) /= '(') then |
| 1678 | expanded_pattern_buf = get_shell_variable(shell, trim(default_value(2:))) |
| 1679 | else |
| 1680 | expanded_pattern_buf = default_value |
| 1681 | end if |
| 1682 | call remove_prefix_pattern(trim(var_value), trim(expanded_pattern_buf), result, .false.) |
| 1683 | return |
| 1684 | end if |
| 1685 | |
| 1686 | ! ${parameter##word} - remove largest prefix pattern |
| 1687 | hash2_pos = index(param_expr, '##') |
| 1688 | if (hash2_pos > 0) then |
| 1689 | param_name = param_expr(:hash2_pos-1) |
| 1690 | default_value = param_expr(hash2_pos+2:) |
| 1691 | var_value = get_shell_variable(shell, trim(param_name)) |
| 1692 | ! Expand simple $var in pattern |
| 1693 | if (len_trim(default_value) > 1 .and. default_value(1:1) == '$' .and. & |
| 1694 | default_value(2:2) /= '{' .and. default_value(2:2) /= '(') then |
| 1695 | expanded_pattern_buf = get_shell_variable(shell, trim(default_value(2:))) |
| 1696 | else |
| 1697 | expanded_pattern_buf = default_value |
| 1698 | end if |
| 1699 | call remove_prefix_pattern(trim(var_value), trim(expanded_pattern_buf), result, .true.) |
| 1700 | return |
| 1701 | end if |
| 1702 | |
| 1703 | ! Simple ${parameter} expansion |
| 1704 | result = trim(get_shell_variable(shell, trim(param_expr))) |
| 1705 | end subroutine |
| 1706 | |
| 1707 | function variable_exists(shell, name) result(exists) |
| 1708 | type(shell_state_t), intent(in) :: shell |
| 1709 | character(len=*), intent(in) :: name |
| 1710 | logical :: exists |
| 1711 | integer :: i |
| 1712 | |
| 1713 | exists = .false. |
| 1714 | do i = 1, shell%num_variables |
| 1715 | if (trim(shell%variables(i)%name) == trim(name)) then |
| 1716 | exists = .true. |
| 1717 | return |
| 1718 | end if |
| 1719 | end do |
| 1720 | end function |
| 1721 | |
| 1722 | subroutine remove_suffix_pattern(value, pattern, result, largest) |
| 1723 | character(len=*), intent(in) :: value, pattern |
| 1724 | character(len=*), intent(out) :: result |
| 1725 | logical, intent(in) :: largest |
| 1726 | |
| 1727 | integer :: i, match_pos |
| 1728 | |
| 1729 | result = value |
| 1730 | match_pos = 0 |
| 1731 | |
| 1732 | ! Simple pattern matching - exact match only for now |
| 1733 | ! TODO: Add full glob pattern support |
| 1734 | if (largest) then |
| 1735 | ! Find rightmost match |
| 1736 | do i = len_trim(value), len_trim(pattern), -1 |
| 1737 | if (value(i-len_trim(pattern)+1:i) == pattern) then |
| 1738 | match_pos = i - len_trim(pattern) + 1 |
| 1739 | exit |
| 1740 | end if |
| 1741 | end do |
| 1742 | else |
| 1743 | ! Find leftmost match from the right |
| 1744 | do i = len_trim(value) - len_trim(pattern) + 1, 1, -1 |
| 1745 | if (value(i:i+len_trim(pattern)-1) == pattern) then |
| 1746 | match_pos = i |
| 1747 | end if |
| 1748 | end do |
| 1749 | end if |
| 1750 | |
| 1751 | if (match_pos > 0) then |
| 1752 | result = value(:match_pos-1) |
| 1753 | end if |
| 1754 | end subroutine |
| 1755 | |
| 1756 | subroutine remove_prefix_pattern(value, pattern, result, largest) |
| 1757 | character(len=*), intent(in) :: value, pattern |
| 1758 | character(len=*), intent(out) :: result |
| 1759 | logical, intent(in) :: largest |
| 1760 | |
| 1761 | integer :: i, match_pos, match_end |
| 1762 | |
| 1763 | result = value |
| 1764 | match_pos = 0 |
| 1765 | match_end = 0 |
| 1766 | |
| 1767 | ! Simple pattern matching - exact match only for now |
| 1768 | ! TODO: Add full glob pattern support |
| 1769 | if (largest) then |
| 1770 | ! Find rightmost match from the left |
| 1771 | do i = 1, len_trim(value) - len_trim(pattern) + 1 |
| 1772 | if (value(i:i+len_trim(pattern)-1) == pattern) then |
| 1773 | match_pos = i |
| 1774 | match_end = i + len_trim(pattern) - 1 |
| 1775 | end if |
| 1776 | end do |
| 1777 | else |
| 1778 | ! Find leftmost match |
| 1779 | do i = 1, len_trim(value) - len_trim(pattern) + 1 |
| 1780 | if (value(i:i+len_trim(pattern)-1) == pattern) then |
| 1781 | match_pos = i |
| 1782 | match_end = i + len_trim(pattern) - 1 |
| 1783 | exit |
| 1784 | end if |
| 1785 | end do |
| 1786 | end if |
| 1787 | |
| 1788 | if (match_pos > 0) then |
| 1789 | result = value(match_end+1:) |
| 1790 | end if |
| 1791 | end subroutine |
| 1792 | |
| 1793 | ! Positional parameter support functions |
| 1794 | subroutine set_positional_params(shell, params, count) |
| 1795 | type(shell_state_t), intent(inout) :: shell |
| 1796 | character(len=*), intent(in) :: params(:) |
| 1797 | integer, intent(in) :: count |
| 1798 | integer :: i, actual_count |
| 1799 | |
| 1800 | actual_count = min(count, size(shell%positional_params)) |
| 1801 | shell%num_positional = actual_count |
| 1802 | |
| 1803 | do i = 1, actual_count |
| 1804 | shell%positional_params(i)%str = params(i) |
| 1805 | end do |
| 1806 | |
| 1807 | ! Clear any remaining parameters |
| 1808 | do i = actual_count + 1, size(shell%positional_params) |
| 1809 | shell%positional_params(i)%str = '' |
| 1810 | end do |
| 1811 | end subroutine |
| 1812 | |
| 1813 | subroutine get_all_positional_params(shell, result, as_single_word) |
| 1814 | type(shell_state_t), intent(in) :: shell |
| 1815 | character(len=*), intent(out) :: result |
| 1816 | logical, intent(in) :: as_single_word |
| 1817 | integer :: i, pos |
| 1818 | character(len=1) :: separator |
| 1819 | |
| 1820 | result = '' |
| 1821 | if (shell%num_positional == 0) return |
| 1822 | |
| 1823 | if (as_single_word) then |
| 1824 | ! Use first character of IFS as separator for $* |
| 1825 | ! POSIX: If IFS is empty (set to ""), no separator is used |
| 1826 | if (len_trim(shell%ifs) > 0) then |
| 1827 | separator = shell%ifs(1:1) |
| 1828 | else |
| 1829 | separator = char(0) ! Use NUL to indicate no separator |
| 1830 | end if |
| 1831 | else |
| 1832 | ! Use space for $@ (will be properly quoted during expansion) |
| 1833 | separator = ' ' |
| 1834 | end if |
| 1835 | |
| 1836 | pos = 1 |
| 1837 | do i = 1, shell%num_positional |
| 1838 | if (i > 1 .and. separator /= char(0)) then |
| 1839 | result(pos:pos) = separator |
| 1840 | pos = pos + 1 |
| 1841 | end if |
| 1842 | result(pos:pos+len_trim(shell%positional_params(i)%str)-1) = trim(shell%positional_params(i)%str) |
| 1843 | pos = pos + len_trim(shell%positional_params(i)%str) |
| 1844 | end do |
| 1845 | end subroutine |
| 1846 | |
| 1847 | subroutine shift_positional_params(shell, count) |
| 1848 | type(shell_state_t), intent(inout) :: shell |
| 1849 | integer, intent(in) :: count |
| 1850 | integer :: i, shift_count |
| 1851 | |
| 1852 | shift_count = min(count, shell%num_positional) |
| 1853 | |
| 1854 | ! Shift parameters left |
| 1855 | do i = 1, shell%num_positional - shift_count |
| 1856 | shell%positional_params(i)%str = shell%positional_params(i + shift_count)%str |
| 1857 | end do |
| 1858 | |
| 1859 | ! Clear the shifted parameters |
| 1860 | do i = shell%num_positional - shift_count + 1, shell%num_positional |
| 1861 | shell%positional_params(i)%str = '' |
| 1862 | end do |
| 1863 | |
| 1864 | shell%num_positional = shell%num_positional - shift_count |
| 1865 | end subroutine |
| 1866 | |
| 1867 | function is_numeric(str) result(is_num) |
| 1868 | character(len=*), intent(in) :: str |
| 1869 | logical :: is_num |
| 1870 | integer :: i |
| 1871 | |
| 1872 | is_num = .false. |
| 1873 | if (len_trim(str) == 0) return |
| 1874 | |
| 1875 | do i = 1, len_trim(str) |
| 1876 | if (str(i:i) < '0' .or. str(i:i) > '9') return |
| 1877 | end do |
| 1878 | |
| 1879 | is_num = .true. |
| 1880 | end function |
| 1881 | |
| 1882 | function string_to_int(str) result(int_val) |
| 1883 | character(len=*), intent(in) :: str |
| 1884 | integer :: int_val, iostat |
| 1885 | |
| 1886 | read(str, *, iostat=iostat) int_val |
| 1887 | if (iostat /= 0) int_val = 0 ! Error reading, return 0 |
| 1888 | end function |
| 1889 | |
| 1890 | ! Helper functions for special variables |
| 1891 | function get_shell_option_flags(shell) result(flags) |
| 1892 | type(shell_state_t), intent(in) :: shell |
| 1893 | character(len=256) :: flags |
| 1894 | integer :: pos |
| 1895 | |
| 1896 | flags = '' |
| 1897 | pos = 1 |
| 1898 | |
| 1899 | ! Build option flags string from shell options |
| 1900 | ! Order follows bash convention for common flags: h, i, m, B, H, s, then others |
| 1901 | ! h for hashall (enabled by default in most shells) |
| 1902 | flags(pos:pos) = 'h' |
| 1903 | pos = pos + 1 |
| 1904 | if (shell%is_interactive) then |
| 1905 | flags(pos:pos) = 'i' |
| 1906 | pos = pos + 1 |
| 1907 | end if |
| 1908 | if (shell%option_monitor) then |
| 1909 | flags(pos:pos) = 'm' |
| 1910 | pos = pos + 1 |
| 1911 | end if |
| 1912 | ! B for braceexpand (bash extension, enabled by default) |
| 1913 | flags(pos:pos) = 'B' |
| 1914 | pos = pos + 1 |
| 1915 | ! c flag when running in command mode (-c) |
| 1916 | if (shell%in_command_mode) then |
| 1917 | flags(pos:pos) = 'c' |
| 1918 | pos = pos + 1 |
| 1919 | end if |
| 1920 | if (shell%option_allexport) then |
| 1921 | flags(pos:pos) = 'a' |
| 1922 | pos = pos + 1 |
| 1923 | end if |
| 1924 | if (shell%option_errexit) then |
| 1925 | flags(pos:pos) = 'e' |
| 1926 | pos = pos + 1 |
| 1927 | end if |
| 1928 | if (shell%option_noglob) then |
| 1929 | flags(pos:pos) = 'f' |
| 1930 | pos = pos + 1 |
| 1931 | end if |
| 1932 | if (shell%option_nounset) then |
| 1933 | flags(pos:pos) = 'u' |
| 1934 | pos = pos + 1 |
| 1935 | end if |
| 1936 | if (shell%option_verbose) then |
| 1937 | flags(pos:pos) = 'v' |
| 1938 | pos = pos + 1 |
| 1939 | end if |
| 1940 | if (shell%option_xtrace) then |
| 1941 | flags(pos:pos) = 'x' |
| 1942 | pos = pos + 1 |
| 1943 | end if |
| 1944 | if (shell%option_noclobber) then |
| 1945 | flags(pos:pos) = 'C' |
| 1946 | pos = pos + 1 |
| 1947 | end if |
| 1948 | end function |
| 1949 | |
| 1950 | subroutine get_random_number(value) |
| 1951 | character(len=*), intent(out) :: value |
| 1952 | real :: rand_val |
| 1953 | integer :: rand_int |
| 1954 | |
| 1955 | call random_number(rand_val) |
| 1956 | rand_int = int(rand_val * 32768.0) |
| 1957 | write(value, '(i15)') rand_int |
| 1958 | end subroutine |
| 1959 | |
| 1960 | subroutine get_seconds_since_start(shell, value) |
| 1961 | type(shell_state_t), intent(in) :: shell |
| 1962 | character(len=*), intent(out) :: value |
| 1963 | integer :: current_time, elapsed |
| 1964 | |
| 1965 | ! Get current time |
| 1966 | call system_clock(current_time) |
| 1967 | |
| 1968 | ! Calculate elapsed seconds |
| 1969 | if (shell%shell_start_time > 0) then |
| 1970 | elapsed = (current_time - shell%shell_start_time) / 1000 ! Assuming milliseconds |
| 1971 | else |
| 1972 | elapsed = 0 |
| 1973 | end if |
| 1974 | |
| 1975 | write(value, '(i15)') elapsed |
| 1976 | end subroutine |
| 1977 | |
| 1978 | function get_random_int() result(rand_int) |
| 1979 | integer :: rand_int |
| 1980 | real :: rand_val |
| 1981 | call random_number(rand_val) |
| 1982 | rand_int = int(rand_val * 32768.0) |
| 1983 | end function |
| 1984 | |
| 1985 | function get_elapsed_seconds(shell) result(elapsed) |
| 1986 | type(shell_state_t), intent(in) :: shell |
| 1987 | integer :: elapsed, current_time |
| 1988 | call system_clock(current_time) |
| 1989 | if (shell%shell_start_time > 0) then |
| 1990 | elapsed = (current_time - shell%shell_start_time) / 1000 |
| 1991 | else |
| 1992 | elapsed = 0 |
| 1993 | end if |
| 1994 | end function |
| 1995 | |
| 1996 | ! Get the actual stored length of a variable (for ${#var} expansion) |
| 1997 | ! Returns -1 if variable not found or doesn't have stored length |
| 1998 | subroutine get_variable_length(shell, name, length) |
| 1999 | type(shell_state_t), intent(in) :: shell |
| 2000 | character(len=*), intent(in) :: name |
| 2001 | integer, intent(out) :: length |
| 2002 | integer :: i, depth |
| 2003 | |
| 2004 | length = -1 |
| 2005 | |
| 2006 | ! First check local variables (innermost scope first) |
| 2007 | if (shell%function_depth > 0) then |
| 2008 | do depth = shell%function_depth, 1, -1 |
| 2009 | if (depth <= size(shell%local_var_counts)) then |
| 2010 | do i = 1, shell%local_var_counts(depth) |
| 2011 | if (trim(shell%local_vars(depth, i)%name) == trim(name)) then |
| 2012 | length = shell%local_vars(depth, i)%value_len |
| 2013 | return |
| 2014 | end if |
| 2015 | end do |
| 2016 | end if |
| 2017 | end do |
| 2018 | end if |
| 2019 | |
| 2020 | ! Check special prompt variables |
| 2021 | select case (trim(name)) |
| 2022 | case ('PS1') |
| 2023 | length = shell%ps1_len |
| 2024 | return |
| 2025 | case ('PS2') |
| 2026 | length = shell%ps2_len |
| 2027 | return |
| 2028 | case ('PS3') |
| 2029 | length = shell%ps3_len |
| 2030 | return |
| 2031 | case ('PS4') |
| 2032 | length = shell%ps4_len |
| 2033 | return |
| 2034 | end select |
| 2035 | |
| 2036 | ! Check regular shell variables |
| 2037 | do i = 1, shell%num_variables |
| 2038 | if (trim(shell%variables(i)%name) == trim(name)) then |
| 2039 | length = shell%variables(i)%value_len |
| 2040 | return |
| 2041 | end if |
| 2042 | end do |
| 2043 | end subroutine |
| 2044 | |
| 2045 | ! Strip surrounding quotes (single or double) from a string |
| 2046 | ! Preserves trailing spaces within quotes |
| 2047 | subroutine strip_quotes(str) |
| 2048 | character(len=*), intent(inout) :: str |
| 2049 | integer :: i, search_end, closing_quote_pos, content_len |
| 2050 | character(len=len(str)) :: temp |
| 2051 | character(len=1) :: quote_char |
| 2052 | |
| 2053 | if (len_trim(str) < 2) return |
| 2054 | |
| 2055 | ! Check if string starts with a quote |
| 2056 | if (str(1:1) /= "'" .and. str(1:1) /= '"') return |
| 2057 | |
| 2058 | quote_char = str(1:1) |
| 2059 | |
| 2060 | ! Search backwards to find closing quote (use len_trim to avoid padding) |
| 2061 | closing_quote_pos = 0 |
| 2062 | search_end = len_trim(str) |
| 2063 | do i = search_end, 2, -1 |
| 2064 | if (str(i:i) == quote_char) then |
| 2065 | closing_quote_pos = i |
| 2066 | exit |
| 2067 | end if |
| 2068 | end do |
| 2069 | |
| 2070 | ! If we found a matching closing quote, extract the content (preserving all characters including trailing spaces) |
| 2071 | if (closing_quote_pos > 1) then |
| 2072 | content_len = closing_quote_pos - 2 |
| 2073 | ! Save the original string first |
| 2074 | temp = str |
| 2075 | ! Clear the output string |
| 2076 | str = repeat(' ', len(str)) |
| 2077 | ! Copy character by character from positions 2 to closing_quote_pos-1 |
| 2078 | ! This preserves ALL characters including trailing spaces |
| 2079 | do i = 1, content_len |
| 2080 | str(i:i) = temp(i+1:i+1) |
| 2081 | end do |
| 2082 | end if |
| 2083 | end subroutine |
| 2084 | |
| 2085 | ! Check if nounset option is enabled and handle undefined variable |
| 2086 | ! Moved from shell_options to break circular dependency |
| 2087 | function check_nounset(shell, var_name) result(should_error) |
| 2088 | type(shell_state_t), intent(in) :: shell |
| 2089 | character(len=*), intent(in) :: var_name |
| 2090 | logical :: should_error |
| 2091 | |
| 2092 | should_error = shell%option_nounset |
| 2093 | if (should_error) then |
| 2094 | write(error_unit, '(a)') 'fortsh: ' // trim(var_name) // ': unbound variable' |
| 2095 | end if |
| 2096 | end function |
| 2097 | |
| 2098 | end module variables |