| 1 | ! ============================================================================== |
| 2 | ! Module: printf_builtin |
| 3 | ! Purpose: Printf built-in command with full POSIX format string support |
| 4 | ! ============================================================================== |
| 5 | module printf_builtin |
| 6 | use shell_types |
| 7 | use iso_fortran_env, only: output_unit, error_unit |
| 8 | implicit none |
| 9 | |
| 10 | ! Format specifier components |
| 11 | type :: format_info_t |
| 12 | logical :: left_align = .false. ! '-' flag |
| 13 | logical :: zero_pad = .false. ! '0' flag |
| 14 | logical :: show_sign = .false. ! '+' flag |
| 15 | logical :: space_sign = .false. ! ' ' flag |
| 16 | logical :: alternate = .false. ! '#' flag |
| 17 | integer :: width = 0 ! field width |
| 18 | integer :: precision = -1 ! precision (-1 = default) |
| 19 | logical :: width_from_arg = .false. ! '*' for width |
| 20 | logical :: prec_from_arg = .false. ! '*' for precision |
| 21 | character :: conversion = 's' ! conversion specifier |
| 22 | end type |
| 23 | |
| 24 | contains |
| 25 | |
| 26 | subroutine builtin_printf(cmd, shell) |
| 27 | use iso_fortran_env, only: error_unit |
| 28 | type(command_t), intent(in) :: cmd |
| 29 | type(shell_state_t), intent(inout) :: shell |
| 30 | |
| 31 | character(len=4096) :: format_string |
| 32 | character(len=:), allocatable :: output_buffer |
| 33 | integer :: arg_index, prev_arg_index, output_len, format_string_len |
| 34 | integer, allocatable :: arg_lengths(:) |
| 35 | integer :: i, buf_size |
| 36 | logical :: fmt_error |
| 37 | |
| 38 | if (cmd%num_tokens < 2) then |
| 39 | write(error_unit, '(a)') 'printf: usage: printf FORMAT [ARGUMENTS...]' |
| 40 | shell%last_exit_status = 2 |
| 41 | return |
| 42 | end if |
| 43 | |
| 44 | format_string = cmd%tokens(2) |
| 45 | ! Determine format string length: |
| 46 | ! - token_lengths can be wrong for strings with shell-processed escapes |
| 47 | ! - len_trim strips intentional trailing spaces |
| 48 | ! Solution: Use len_trim as base. For quoted tokens ending with space, |
| 49 | ! try to preserve trailing spaces if token_lengths is close to len_trim |
| 50 | ! (difference of 1-2 suggests trailing spaces, not escape processing) |
| 51 | format_string_len = len_trim(format_string) |
| 52 | if (allocated(cmd%token_quoted) .and. size(cmd%token_quoted) >= 2) then |
| 53 | if (cmd%token_quoted(2)) then |
| 54 | ! Quoted token - check for trailing spaces to preserve |
| 55 | if (allocated(cmd%token_lengths) .and. size(cmd%token_lengths) >= 2) then |
| 56 | ! Only extend for small differences (1-2 chars) that suggest trailing spaces |
| 57 | ! Larger differences likely indicate escape processing mismatch |
| 58 | if (cmd%token_lengths(2) > format_string_len .and. & |
| 59 | cmd%token_lengths(2) <= format_string_len + 2 .and. & |
| 60 | cmd%token_lengths(2) <= len(format_string)) then |
| 61 | ! Verify the extra chars are spaces |
| 62 | if (format_string(format_string_len+1:cmd%token_lengths(2)) == & |
| 63 | repeat(' ', cmd%token_lengths(2) - format_string_len)) then |
| 64 | format_string_len = cmd%token_lengths(2) |
| 65 | end if |
| 66 | end if |
| 67 | end if |
| 68 | end if |
| 69 | end if |
| 70 | |
| 71 | ! Build array of argument lengths for preserving trailing spaces |
| 72 | allocate(arg_lengths(cmd%num_tokens)) |
| 73 | do i = 1, cmd%num_tokens |
| 74 | if (allocated(cmd%token_lengths) .and. i <= size(cmd%token_lengths)) then |
| 75 | arg_lengths(i) = cmd%token_lengths(i) |
| 76 | else |
| 77 | arg_lengths(i) = len_trim(cmd%tokens(i)) |
| 78 | end if |
| 79 | end do |
| 80 | |
| 81 | arg_index = 3 |
| 82 | fmt_error = .false. |
| 83 | |
| 84 | ! Size buffer based on argument content — each format cycle can produce |
| 85 | ! up to sum(arg_lengths) + format_string_len of output |
| 86 | buf_size = format_string_len |
| 87 | do i = 3, cmd%num_tokens |
| 88 | buf_size = buf_size + arg_lengths(i) |
| 89 | end do |
| 90 | buf_size = max(buf_size * 2, 65536) |
| 91 | allocate(character(len=buf_size) :: output_buffer) |
| 92 | |
| 93 | ! POSIX behavior: always output format string at least once, |
| 94 | ! then repeat for any remaining arguments |
| 95 | do |
| 96 | prev_arg_index = arg_index |
| 97 | call process_printf_format(format_string, format_string_len, cmd%tokens, & |
| 98 | cmd%num_tokens, arg_lengths, arg_index, & |
| 99 | output_buffer, output_len, fmt_error) |
| 100 | ! Output exactly output_len characters to preserve trailing spaces |
| 101 | if (output_len > 0) then |
| 102 | write(output_unit, '(a)', advance='no') output_buffer(1:output_len) |
| 103 | flush(output_unit) |
| 104 | end if |
| 105 | |
| 106 | ! If no arguments were consumed, we're done (format has no specifiers or no more args) |
| 107 | if (arg_index == prev_arg_index .or. arg_index > cmd%num_tokens) exit |
| 108 | end do |
| 109 | |
| 110 | deallocate(arg_lengths) |
| 111 | if (fmt_error) then |
| 112 | shell%last_exit_status = 1 |
| 113 | else |
| 114 | shell%last_exit_status = 0 |
| 115 | end if |
| 116 | end subroutine |
| 117 | |
| 118 | subroutine process_printf_format(format_str, format_str_len, args, num_args, & |
| 119 | arg_lengths, start_arg, output, output_len, had_error) |
| 120 | character(len=*), intent(in) :: format_str |
| 121 | integer, intent(in) :: format_str_len |
| 122 | character(len=*), intent(in) :: args(:) |
| 123 | integer, intent(in) :: num_args |
| 124 | integer, intent(in) :: arg_lengths(:) |
| 125 | integer, intent(inout) :: start_arg |
| 126 | character(len=*), intent(out) :: output |
| 127 | integer, intent(out) :: output_len |
| 128 | logical, intent(inout), optional :: had_error |
| 129 | |
| 130 | integer :: pos, output_pos, arg_index, format_len, fmt_len |
| 131 | integer :: current_arg_len |
| 132 | logical :: arg_error |
| 133 | character :: current_char, next_char |
| 134 | type(format_info_t) :: fmt_info |
| 135 | character(len=4096) :: arg_value, formatted_value |
| 136 | |
| 137 | pos = 1 |
| 138 | output_pos = 1 |
| 139 | arg_index = start_arg |
| 140 | output = '' |
| 141 | arg_error = .false. |
| 142 | ! Use actual format string length to preserve trailing spaces |
| 143 | format_len = format_str_len |
| 144 | |
| 145 | do while (pos <= format_len) |
| 146 | current_char = format_str(pos:pos) |
| 147 | |
| 148 | if (current_char == '%' .and. pos < format_len) then |
| 149 | next_char = format_str(pos+1:pos+1) |
| 150 | |
| 151 | if (next_char == '%') then |
| 152 | ! Escaped percent |
| 153 | if (output_pos <= len(output)) then |
| 154 | output(output_pos:output_pos) = '%' |
| 155 | output_pos = output_pos + 1 |
| 156 | end if |
| 157 | pos = pos + 2 |
| 158 | else |
| 159 | ! Parse format specifier |
| 160 | call parse_format_specifier(format_str, pos, fmt_info) |
| 161 | |
| 162 | ! Handle dynamic width from argument |
| 163 | if (fmt_info%width_from_arg) then |
| 164 | if (arg_index <= num_args) then |
| 165 | read(args(arg_index), *, err=10, end=10) fmt_info%width |
| 166 | 10 arg_index = arg_index + 1 |
| 167 | end if |
| 168 | end if |
| 169 | |
| 170 | ! Handle dynamic precision from argument |
| 171 | if (fmt_info%prec_from_arg) then |
| 172 | if (arg_index <= num_args) then |
| 173 | read(args(arg_index), *, err=20, end=20) fmt_info%precision |
| 174 | 20 arg_index = arg_index + 1 |
| 175 | end if |
| 176 | end if |
| 177 | |
| 178 | ! Get argument value and its length |
| 179 | if (arg_index <= num_args) then |
| 180 | arg_value = args(arg_index) |
| 181 | if (arg_index <= size(arg_lengths)) then |
| 182 | current_arg_len = arg_lengths(arg_index) |
| 183 | else |
| 184 | current_arg_len = len_trim(arg_value) |
| 185 | end if |
| 186 | arg_index = arg_index + 1 |
| 187 | else |
| 188 | arg_value = '' |
| 189 | current_arg_len = 0 |
| 190 | end if |
| 191 | |
| 192 | call format_argument(fmt_info, arg_value, current_arg_len, formatted_value, fmt_len, arg_error) |
| 193 | if (arg_error .and. present(had_error)) had_error = .true. |
| 194 | |
| 195 | ! Append formatted value to output (use exact length to preserve padding) |
| 196 | call append_to_output_len(output, output_pos, formatted_value, fmt_len) |
| 197 | end if |
| 198 | else if (current_char == char(92) .and. pos < format_len) then |
| 199 | ! Handle escape sequences (backslash) |
| 200 | call process_escape_sequence(format_str, pos, output, output_pos) |
| 201 | else |
| 202 | ! Regular character |
| 203 | if (output_pos <= len(output)) then |
| 204 | output(output_pos:output_pos) = current_char |
| 205 | output_pos = output_pos + 1 |
| 206 | end if |
| 207 | pos = pos + 1 |
| 208 | end if |
| 209 | end do |
| 210 | |
| 211 | ! Update start_arg to reflect how many arguments were consumed |
| 212 | start_arg = arg_index |
| 213 | ! Return actual output length (output_pos - 1 is the last written position) |
| 214 | output_len = output_pos - 1 |
| 215 | end subroutine |
| 216 | |
| 217 | subroutine parse_format_specifier(format_str, pos, fmt_info) |
| 218 | character(len=*), intent(in) :: format_str |
| 219 | integer, intent(inout) :: pos |
| 220 | type(format_info_t), intent(out) :: fmt_info |
| 221 | |
| 222 | integer :: format_len, width_start |
| 223 | character :: c |
| 224 | logical :: parsing_flags, parsing_width, parsing_precision |
| 225 | |
| 226 | ! Initialize |
| 227 | fmt_info%left_align = .false. |
| 228 | fmt_info%zero_pad = .false. |
| 229 | fmt_info%show_sign = .false. |
| 230 | fmt_info%space_sign = .false. |
| 231 | fmt_info%alternate = .false. |
| 232 | fmt_info%width = 0 |
| 233 | fmt_info%precision = -1 |
| 234 | fmt_info%width_from_arg = .false. |
| 235 | fmt_info%prec_from_arg = .false. |
| 236 | fmt_info%conversion = 's' |
| 237 | |
| 238 | format_len = len_trim(format_str) |
| 239 | pos = pos + 1 ! Skip % |
| 240 | |
| 241 | parsing_flags = .true. |
| 242 | parsing_width = .false. |
| 243 | parsing_precision = .false. |
| 244 | |
| 245 | do while (pos <= format_len) |
| 246 | c = format_str(pos:pos) |
| 247 | |
| 248 | ! Parse flags |
| 249 | if (parsing_flags) then |
| 250 | select case (c) |
| 251 | case ('-') |
| 252 | fmt_info%left_align = .true. |
| 253 | pos = pos + 1 |
| 254 | cycle |
| 255 | case ('+') |
| 256 | fmt_info%show_sign = .true. |
| 257 | pos = pos + 1 |
| 258 | cycle |
| 259 | case (' ') |
| 260 | fmt_info%space_sign = .true. |
| 261 | pos = pos + 1 |
| 262 | cycle |
| 263 | case ('#') |
| 264 | fmt_info%alternate = .true. |
| 265 | pos = pos + 1 |
| 266 | cycle |
| 267 | case ('0') |
| 268 | ! Only a flag if at start of width |
| 269 | if (.not. parsing_width) then |
| 270 | fmt_info%zero_pad = .true. |
| 271 | pos = pos + 1 |
| 272 | cycle |
| 273 | end if |
| 274 | case default |
| 275 | parsing_flags = .false. |
| 276 | end select |
| 277 | end if |
| 278 | |
| 279 | ! Parse width |
| 280 | if (c == '*') then |
| 281 | fmt_info%width_from_arg = .true. |
| 282 | pos = pos + 1 |
| 283 | c = format_str(pos:pos) |
| 284 | else if (c >= '0' .and. c <= '9') then |
| 285 | width_start = pos |
| 286 | do while (pos <= format_len) |
| 287 | c = format_str(pos:pos) |
| 288 | if (c < '0' .or. c > '9') exit |
| 289 | pos = pos + 1 |
| 290 | end do |
| 291 | read(format_str(width_start:pos-1), '(I10)') fmt_info%width |
| 292 | c = format_str(pos:pos) |
| 293 | end if |
| 294 | |
| 295 | ! Parse precision |
| 296 | if (c == '.') then |
| 297 | pos = pos + 1 |
| 298 | if (pos > format_len) exit |
| 299 | c = format_str(pos:pos) |
| 300 | |
| 301 | if (c == '*') then |
| 302 | fmt_info%prec_from_arg = .true. |
| 303 | pos = pos + 1 |
| 304 | else if (c >= '0' .and. c <= '9') then |
| 305 | width_start = pos |
| 306 | do while (pos <= format_len) |
| 307 | c = format_str(pos:pos) |
| 308 | if (c < '0' .or. c > '9') exit |
| 309 | pos = pos + 1 |
| 310 | end do |
| 311 | read(format_str(width_start:pos-1), '(I10)') fmt_info%precision |
| 312 | else |
| 313 | fmt_info%precision = 0 |
| 314 | end if |
| 315 | if (pos > format_len) exit |
| 316 | c = format_str(pos:pos) |
| 317 | end if |
| 318 | |
| 319 | ! Check for conversion specifier |
| 320 | if (index('diouxXeEfFgGaAcspbq', c) > 0) then |
| 321 | fmt_info%conversion = c |
| 322 | pos = pos + 1 |
| 323 | return |
| 324 | end if |
| 325 | |
| 326 | ! Unknown character, skip |
| 327 | pos = pos + 1 |
| 328 | end do |
| 329 | end subroutine |
| 330 | |
| 331 | subroutine format_argument(fmt_info, arg_value, arg_len, formatted_value, formatted_len, had_error) |
| 332 | type(format_info_t), intent(in) :: fmt_info |
| 333 | character(len=*), intent(in) :: arg_value |
| 334 | integer, intent(in) :: arg_len ! Actual length of arg_value (to preserve trailing spaces) |
| 335 | character(len=*), intent(out) :: formatted_value |
| 336 | integer, intent(out) :: formatted_len |
| 337 | logical, intent(out), optional :: had_error |
| 338 | |
| 339 | character(len=4096) :: raw_value, temp_value |
| 340 | integer :: int_val, status, val_len, pad_len, prec, actual_len |
| 341 | real(8) :: real_val |
| 342 | character :: pad_char |
| 343 | |
| 344 | formatted_value = '' |
| 345 | raw_value = '' |
| 346 | formatted_len = 0 |
| 347 | if (present(had_error)) had_error = .false. |
| 348 | |
| 349 | ! Use provided arg_len to preserve trailing spaces |
| 350 | actual_len = arg_len |
| 351 | if (actual_len <= 0 .or. actual_len > len(arg_value)) then |
| 352 | actual_len = len_trim(arg_value) |
| 353 | end if |
| 354 | |
| 355 | select case (fmt_info%conversion) |
| 356 | case ('s') |
| 357 | ! String - use actual_len to preserve trailing spaces |
| 358 | if (actual_len > 0 .and. actual_len <= len(raw_value)) then |
| 359 | raw_value = arg_value(1:actual_len) |
| 360 | else |
| 361 | raw_value = arg_value |
| 362 | end if |
| 363 | ! Apply precision (truncation for strings) |
| 364 | if (fmt_info%precision >= 0 .and. fmt_info%precision < actual_len) then |
| 365 | raw_value = raw_value(1:fmt_info%precision) |
| 366 | actual_len = fmt_info%precision |
| 367 | end if |
| 368 | |
| 369 | case ('b') |
| 370 | ! %b: interpret backslash escapes in argument |
| 371 | call interpret_escapes(arg_value, raw_value) |
| 372 | |
| 373 | case ('c') |
| 374 | ! Character |
| 375 | if (actual_len > 0) then |
| 376 | raw_value = arg_value(1:1) |
| 377 | else |
| 378 | raw_value = '' |
| 379 | end if |
| 380 | |
| 381 | case ('d', 'i') |
| 382 | ! Integer |
| 383 | call parse_integer(arg_value, int_val, status) |
| 384 | if (status == 0) then |
| 385 | call format_integer(int_val, fmt_info, raw_value) |
| 386 | else |
| 387 | write(error_unit, '(a,a,a)') 'fortsh: printf: ', trim(arg_value), ': invalid number' |
| 388 | if (present(had_error)) had_error = .true. |
| 389 | raw_value = '0' |
| 390 | end if |
| 391 | |
| 392 | case ('o') |
| 393 | ! Octal |
| 394 | call parse_integer(arg_value, int_val, status) |
| 395 | if (status == 0) then |
| 396 | write(temp_value, '(O0)') int_val |
| 397 | raw_value = trim(temp_value) |
| 398 | if (fmt_info%alternate .and. int_val /= 0) then |
| 399 | raw_value = '0' // trim(raw_value) |
| 400 | end if |
| 401 | else |
| 402 | write(error_unit, '(a,a,a)') 'fortsh: printf: ', trim(arg_value), ': invalid number' |
| 403 | if (present(had_error)) had_error = .true. |
| 404 | raw_value = '0' |
| 405 | end if |
| 406 | |
| 407 | case ('x') |
| 408 | ! Hex lowercase |
| 409 | call parse_integer(arg_value, int_val, status) |
| 410 | if (status == 0) then |
| 411 | write(temp_value, '(Z0)') int_val |
| 412 | raw_value = to_lowercase(trim(temp_value)) |
| 413 | if (fmt_info%alternate .and. int_val /= 0) then |
| 414 | raw_value = '0x' // trim(raw_value) |
| 415 | end if |
| 416 | else |
| 417 | write(error_unit, '(a,a,a)') 'fortsh: printf: ', trim(arg_value), ': invalid number' |
| 418 | if (present(had_error)) had_error = .true. |
| 419 | raw_value = '0' |
| 420 | end if |
| 421 | |
| 422 | case ('X') |
| 423 | ! Hex uppercase |
| 424 | call parse_integer(arg_value, int_val, status) |
| 425 | if (status == 0) then |
| 426 | write(temp_value, '(Z0)') int_val |
| 427 | raw_value = to_uppercase(trim(temp_value)) |
| 428 | if (fmt_info%alternate .and. int_val /= 0) then |
| 429 | raw_value = '0X' // trim(raw_value) |
| 430 | end if |
| 431 | else |
| 432 | write(error_unit, '(a,a,a)') 'fortsh: printf: ', trim(arg_value), ': invalid number' |
| 433 | if (present(had_error)) had_error = .true. |
| 434 | raw_value = '0' |
| 435 | end if |
| 436 | |
| 437 | case ('u') |
| 438 | ! Unsigned integer (treat as regular integer in Fortran) |
| 439 | call parse_integer(arg_value, int_val, status) |
| 440 | if (status == 0) then |
| 441 | if (int_val < 0) int_val = int_val + 2147483647 + 1 ! Approximate unsigned |
| 442 | write(raw_value, '(I0)') int_val |
| 443 | else |
| 444 | write(error_unit, '(a,a,a)') 'fortsh: printf: ', trim(arg_value), ': invalid number' |
| 445 | if (present(had_error)) had_error = .true. |
| 446 | raw_value = '0' |
| 447 | end if |
| 448 | |
| 449 | case ('f', 'F') |
| 450 | ! Fixed-point notation |
| 451 | read(arg_value, *, iostat=status) real_val |
| 452 | prec = 6 |
| 453 | if (fmt_info%precision >= 0) prec = fmt_info%precision |
| 454 | if (status == 0) then |
| 455 | call format_float_fixed(real_val, prec, raw_value) |
| 456 | else |
| 457 | if (len_trim(arg_value) > 0) then |
| 458 | write(error_unit, '(a,a,a)') 'fortsh: printf: ', trim(arg_value), ': invalid number' |
| 459 | if (present(had_error)) had_error = .true. |
| 460 | end if |
| 461 | raw_value = '0.' // repeat('0', prec) |
| 462 | end if |
| 463 | |
| 464 | case ('e') |
| 465 | ! Scientific notation lowercase |
| 466 | read(arg_value, *, iostat=status) real_val |
| 467 | prec = 6 |
| 468 | if (fmt_info%precision >= 0) prec = fmt_info%precision |
| 469 | if (status == 0) then |
| 470 | call format_float_exp(real_val, prec, raw_value) |
| 471 | raw_value = to_lowercase(raw_value) |
| 472 | else |
| 473 | if (len_trim(arg_value) > 0) then |
| 474 | write(error_unit, '(a,a,a)') 'fortsh: printf: ', trim(arg_value), ': invalid number' |
| 475 | if (present(had_error)) had_error = .true. |
| 476 | end if |
| 477 | raw_value = '0.' // repeat('0', prec) // 'e+00' |
| 478 | end if |
| 479 | |
| 480 | case ('E') |
| 481 | ! Scientific notation uppercase |
| 482 | read(arg_value, *, iostat=status) real_val |
| 483 | prec = 6 |
| 484 | if (fmt_info%precision >= 0) prec = fmt_info%precision |
| 485 | if (status == 0) then |
| 486 | call format_float_exp(real_val, prec, raw_value) |
| 487 | raw_value = to_uppercase(raw_value) |
| 488 | else |
| 489 | if (len_trim(arg_value) > 0) then |
| 490 | write(error_unit, '(a,a,a)') 'fortsh: printf: ', trim(arg_value), ': invalid number' |
| 491 | if (present(had_error)) had_error = .true. |
| 492 | end if |
| 493 | raw_value = '0.' // repeat('0', prec) // 'E+00' |
| 494 | end if |
| 495 | |
| 496 | case ('g', 'G') |
| 497 | ! General format |
| 498 | read(arg_value, *, iostat=status) real_val |
| 499 | prec = 6 |
| 500 | if (fmt_info%precision >= 0) prec = fmt_info%precision |
| 501 | if (status == 0) then |
| 502 | if (abs(real_val) >= 0.0001d0 .and. abs(real_val) < 1000000.0d0) then |
| 503 | call format_float_fixed(real_val, prec, raw_value) |
| 504 | else |
| 505 | call format_float_exp(real_val, prec, raw_value) |
| 506 | end if |
| 507 | if (fmt_info%conversion == 'g') then |
| 508 | raw_value = to_lowercase(raw_value) |
| 509 | else |
| 510 | raw_value = to_uppercase(raw_value) |
| 511 | end if |
| 512 | else |
| 513 | if (len_trim(arg_value) > 0) then |
| 514 | write(error_unit, '(a,a,a)') 'fortsh: printf: ', trim(arg_value), ': invalid number' |
| 515 | if (present(had_error)) had_error = .true. |
| 516 | end if |
| 517 | raw_value = '0' |
| 518 | end if |
| 519 | |
| 520 | case ('q') |
| 521 | ! Shell-quoted string: escape special characters with backslash |
| 522 | block |
| 523 | integer :: qi, qo |
| 524 | qo = 1 |
| 525 | raw_value = '' |
| 526 | do qi = 1, actual_len |
| 527 | select case (arg_value(qi:qi)) |
| 528 | case (' ', '!', '"', '#', '$', '&', "'", '(', ')', '*', ';', '<', '>', '?', & |
| 529 | '[', '\', ']', '^', '`', '{', '|', '}', '~') |
| 530 | raw_value(qo:qo) = '\' |
| 531 | qo = qo + 1 |
| 532 | raw_value(qo:qo) = arg_value(qi:qi) |
| 533 | case default |
| 534 | raw_value(qo:qo) = arg_value(qi:qi) |
| 535 | end select |
| 536 | qo = qo + 1 |
| 537 | end do |
| 538 | actual_len = qo - 1 |
| 539 | end block |
| 540 | |
| 541 | case default |
| 542 | ! Unknown format, treat as string |
| 543 | raw_value = arg_value |
| 544 | end select |
| 545 | |
| 546 | ! Apply width padding |
| 547 | ! For string types, use actual_len to preserve trailing spaces |
| 548 | if (fmt_info%conversion == 's') then |
| 549 | val_len = actual_len |
| 550 | else |
| 551 | val_len = len_trim(raw_value) |
| 552 | end if |
| 553 | |
| 554 | if (fmt_info%width > val_len) then |
| 555 | pad_len = fmt_info%width - val_len |
| 556 | if (fmt_info%zero_pad .and. .not. fmt_info%left_align .and. & |
| 557 | index('diouxXeEfFgG', fmt_info%conversion) > 0) then |
| 558 | pad_char = '0' |
| 559 | else |
| 560 | pad_char = ' ' |
| 561 | end if |
| 562 | |
| 563 | if (fmt_info%left_align) then |
| 564 | ! For strings, use actual length; for others, use trim |
| 565 | if (fmt_info%conversion == 's' .and. val_len > 0) then |
| 566 | formatted_value = raw_value(1:val_len) // repeat(' ', pad_len) |
| 567 | else |
| 568 | formatted_value = trim(raw_value) // repeat(' ', pad_len) |
| 569 | end if |
| 570 | formatted_len = fmt_info%width |
| 571 | else |
| 572 | ! For zero padding with sign, put sign before zeros |
| 573 | if (pad_char == '0' .and. len_trim(raw_value) > 0) then |
| 574 | if (raw_value(1:1) == '-' .or. raw_value(1:1) == '+') then |
| 575 | formatted_value = raw_value(1:1) // repeat('0', pad_len) // trim(raw_value(2:)) |
| 576 | else |
| 577 | formatted_value = repeat('0', pad_len) // trim(raw_value) |
| 578 | end if |
| 579 | else |
| 580 | if (fmt_info%conversion == 's' .and. val_len > 0) then |
| 581 | formatted_value = repeat(pad_char, pad_len) // raw_value(1:val_len) |
| 582 | else |
| 583 | formatted_value = repeat(pad_char, pad_len) // trim(raw_value) |
| 584 | end if |
| 585 | end if |
| 586 | formatted_len = fmt_info%width |
| 587 | end if |
| 588 | else |
| 589 | ! No padding needed - use exact length |
| 590 | if (fmt_info%conversion == 's' .and. val_len > 0) then |
| 591 | formatted_value = raw_value(1:val_len) |
| 592 | else |
| 593 | formatted_value = trim(raw_value) |
| 594 | end if |
| 595 | formatted_len = val_len |
| 596 | end if |
| 597 | end subroutine |
| 598 | |
| 599 | subroutine parse_integer(arg_value, int_val, status) |
| 600 | character(len=*), intent(in) :: arg_value |
| 601 | integer, intent(out) :: int_val |
| 602 | integer, intent(out) :: status |
| 603 | |
| 604 | character(len=256) :: clean_arg |
| 605 | |
| 606 | clean_arg = adjustl(arg_value) |
| 607 | int_val = 0 |
| 608 | status = 0 |
| 609 | |
| 610 | if (len_trim(clean_arg) == 0) then |
| 611 | int_val = 0 |
| 612 | return |
| 613 | end if |
| 614 | |
| 615 | ! Handle character constants like 'A |
| 616 | if (clean_arg(1:1) == "'" .and. len_trim(clean_arg) >= 2) then |
| 617 | int_val = ichar(clean_arg(2:2)) |
| 618 | return |
| 619 | end if |
| 620 | |
| 621 | ! Handle hex (0x...) and octal (0...) prefixes |
| 622 | if (len_trim(clean_arg) >= 2) then |
| 623 | if (clean_arg(1:2) == '0x' .or. clean_arg(1:2) == '0X') then |
| 624 | read(clean_arg(3:), '(Z20)', iostat=status) int_val |
| 625 | return |
| 626 | else if (clean_arg(1:1) == '0' .and. len_trim(clean_arg) > 1) then |
| 627 | ! Could be octal, try it |
| 628 | read(clean_arg(2:), '(O20)', iostat=status) int_val |
| 629 | if (status == 0) return |
| 630 | end if |
| 631 | end if |
| 632 | |
| 633 | ! Standard decimal |
| 634 | read(clean_arg, *, iostat=status) int_val |
| 635 | end subroutine |
| 636 | |
| 637 | subroutine format_integer(int_val, fmt_info, result) |
| 638 | integer, intent(in) :: int_val |
| 639 | type(format_info_t), intent(in) :: fmt_info |
| 640 | character(len=*), intent(out) :: result |
| 641 | |
| 642 | character(len=32) :: temp |
| 643 | |
| 644 | if (int_val >= 0) then |
| 645 | write(temp, '(I0)') int_val |
| 646 | if (fmt_info%show_sign) then |
| 647 | result = '+' // trim(temp) |
| 648 | else if (fmt_info%space_sign) then |
| 649 | result = ' ' // trim(temp) |
| 650 | else |
| 651 | result = trim(temp) |
| 652 | end if |
| 653 | else |
| 654 | write(temp, '(I0)') int_val |
| 655 | result = trim(temp) |
| 656 | end if |
| 657 | end subroutine |
| 658 | |
| 659 | subroutine format_float_fixed(val, precision, result) |
| 660 | real(8), intent(in) :: val |
| 661 | integer, intent(in) :: precision |
| 662 | character(len=*), intent(out) :: result |
| 663 | |
| 664 | character(len=64) :: fmt_str, temp |
| 665 | |
| 666 | write(fmt_str, '(a,i0,a)') '(F0.', precision, ')' |
| 667 | write(temp, fmt_str) val |
| 668 | result = adjustl(temp) |
| 669 | end subroutine |
| 670 | |
| 671 | subroutine format_float_exp(val, precision, result) |
| 672 | real(8), intent(in) :: val |
| 673 | integer, intent(in) :: precision |
| 674 | character(len=*), intent(out) :: result |
| 675 | |
| 676 | character(len=64) :: fmt_str, temp |
| 677 | |
| 678 | write(fmt_str, '(a,i0,a,i0,a)') '(ES', precision+8, '.', precision, ')' |
| 679 | write(temp, fmt_str) val |
| 680 | result = adjustl(temp) |
| 681 | end subroutine |
| 682 | |
| 683 | subroutine interpret_escapes(input, output) |
| 684 | character(len=*), intent(in) :: input |
| 685 | character(len=*), intent(out) :: output |
| 686 | |
| 687 | integer :: pos, out_pos, input_len, octal_val, i |
| 688 | character :: c |
| 689 | character(len=3) :: octal_str |
| 690 | |
| 691 | pos = 1 |
| 692 | out_pos = 1 |
| 693 | input_len = len_trim(input) |
| 694 | output = '' |
| 695 | |
| 696 | do while (pos <= input_len .and. out_pos <= len(output)) |
| 697 | c = input(pos:pos) |
| 698 | |
| 699 | if (c == char(92) .and. pos < input_len) then ! backslash |
| 700 | pos = pos + 1 |
| 701 | c = input(pos:pos) |
| 702 | |
| 703 | select case (c) |
| 704 | case ('n') |
| 705 | output(out_pos:out_pos) = char(10) |
| 706 | case ('t') |
| 707 | output(out_pos:out_pos) = char(9) |
| 708 | case ('r') |
| 709 | output(out_pos:out_pos) = char(13) |
| 710 | case ('b') |
| 711 | output(out_pos:out_pos) = char(8) |
| 712 | case ('a') |
| 713 | output(out_pos:out_pos) = char(7) |
| 714 | case ('f') |
| 715 | output(out_pos:out_pos) = char(12) |
| 716 | case ('e', 'E') |
| 717 | output(out_pos:out_pos) = char(27) |
| 718 | case ('v') |
| 719 | output(out_pos:out_pos) = char(11) |
| 720 | case (char(92)) ! backslash |
| 721 | output(out_pos:out_pos) = char(92) |
| 722 | case ('x') |
| 723 | ! Hex escape: \xHH |
| 724 | block |
| 725 | integer :: hv, hd |
| 726 | character :: hc |
| 727 | hv = 0; hd = 0 |
| 728 | pos = pos + 1 |
| 729 | do while (pos <= input_len .and. hd < 2) |
| 730 | hc = input(pos:pos) |
| 731 | if (hc >= '0' .and. hc <= '9') then |
| 732 | hv = hv * 16 + (ichar(hc) - ichar('0')) |
| 733 | else if (hc >= 'a' .and. hc <= 'f') then |
| 734 | hv = hv * 16 + (ichar(hc) - ichar('a') + 10) |
| 735 | else if (hc >= 'A' .and. hc <= 'F') then |
| 736 | hv = hv * 16 + (ichar(hc) - ichar('A') + 10) |
| 737 | else |
| 738 | exit |
| 739 | end if |
| 740 | pos = pos + 1 |
| 741 | hd = hd + 1 |
| 742 | end do |
| 743 | if (hd > 0 .and. hv <= 255) then |
| 744 | output(out_pos:out_pos) = char(hv) |
| 745 | end if |
| 746 | out_pos = out_pos + 1 |
| 747 | cycle |
| 748 | end block |
| 749 | case ('0', '1', '2', '3', '4', '5', '6', '7') |
| 750 | ! Octal escape |
| 751 | octal_str = c |
| 752 | do i = 2, 3 |
| 753 | if (pos + i - 1 <= input_len) then |
| 754 | c = input(pos + i - 1:pos + i - 1) |
| 755 | if (c >= '0' .and. c <= '7') then |
| 756 | octal_str(i:i) = c |
| 757 | else |
| 758 | exit |
| 759 | end if |
| 760 | else |
| 761 | exit |
| 762 | end if |
| 763 | end do |
| 764 | read(octal_str, '(O3)', err=30) octal_val |
| 765 | output(out_pos:out_pos) = char(mod(octal_val, 256)) |
| 766 | pos = pos + len_trim(octal_str) - 1 |
| 767 | go to 40 |
| 768 | 30 output(out_pos:out_pos) = c |
| 769 | 40 continue |
| 770 | case default |
| 771 | output(out_pos:out_pos) = c |
| 772 | end select |
| 773 | out_pos = out_pos + 1 |
| 774 | pos = pos + 1 |
| 775 | else |
| 776 | output(out_pos:out_pos) = c |
| 777 | out_pos = out_pos + 1 |
| 778 | pos = pos + 1 |
| 779 | end if |
| 780 | end do |
| 781 | end subroutine |
| 782 | |
| 783 | subroutine process_escape_sequence(format_str, pos, output, output_pos) |
| 784 | character(len=*), intent(in) :: format_str |
| 785 | integer, intent(inout) :: pos |
| 786 | character(len=*), intent(inout) :: output |
| 787 | integer, intent(inout) :: output_pos |
| 788 | |
| 789 | character :: escape_char |
| 790 | integer :: format_len, octal_val, i |
| 791 | character(len=3) :: octal_str |
| 792 | |
| 793 | format_len = len_trim(format_str) |
| 794 | |
| 795 | if (pos >= format_len) then |
| 796 | pos = pos + 1 |
| 797 | return |
| 798 | end if |
| 799 | |
| 800 | pos = pos + 1 ! Skip backslash |
| 801 | escape_char = format_str(pos:pos) |
| 802 | |
| 803 | select case (escape_char) |
| 804 | case ('n') |
| 805 | output(output_pos:output_pos) = char(10) ! newline |
| 806 | case ('t') |
| 807 | output(output_pos:output_pos) = char(9) ! tab |
| 808 | case ('r') |
| 809 | output(output_pos:output_pos) = char(13) ! carriage return |
| 810 | case ('b') |
| 811 | output(output_pos:output_pos) = char(8) ! backspace |
| 812 | case ('a') |
| 813 | output(output_pos:output_pos) = char(7) ! bell |
| 814 | case ('f') |
| 815 | output(output_pos:output_pos) = char(12) ! form feed |
| 816 | case ('e', 'E') |
| 817 | output(output_pos:output_pos) = char(27) ! escape |
| 818 | case ('v') |
| 819 | output(output_pos:output_pos) = char(11) ! vertical tab |
| 820 | case (char(92)) ! backslash |
| 821 | output(output_pos:output_pos) = char(92) |
| 822 | case ('"') |
| 823 | output(output_pos:output_pos) = '"' |
| 824 | case ("'") |
| 825 | output(output_pos:output_pos) = "'" |
| 826 | case ('0', '1', '2', '3', '4', '5', '6', '7') |
| 827 | ! Octal escape sequence \NNN |
| 828 | octal_str = escape_char |
| 829 | do i = 2, 3 |
| 830 | if (pos + i - 1 <= format_len) then |
| 831 | escape_char = format_str(pos + i - 1:pos + i - 1) |
| 832 | if (escape_char >= '0' .and. escape_char <= '7') then |
| 833 | octal_str(i:i) = escape_char |
| 834 | else |
| 835 | exit |
| 836 | end if |
| 837 | else |
| 838 | exit |
| 839 | end if |
| 840 | end do |
| 841 | read(octal_str, '(O3)', err=50) octal_val |
| 842 | output(output_pos:output_pos) = char(mod(octal_val, 256)) |
| 843 | pos = pos + len_trim(octal_str) - 1 |
| 844 | go to 60 |
| 845 | 50 output(output_pos:output_pos) = format_str(pos:pos) |
| 846 | 60 continue |
| 847 | case ('x') |
| 848 | ! Hex escape sequence \xNN |
| 849 | block |
| 850 | integer :: hval, hd, hc |
| 851 | hval = 0 |
| 852 | hd = 0 |
| 853 | do while (hd < 2 .and. pos + hd + 1 <= format_len) |
| 854 | hc = ichar(format_str(pos+hd+1:pos+hd+1)) |
| 855 | if (hc >= ichar('0') .and. hc <= ichar('9')) then |
| 856 | hval = hval * 16 + hc - ichar('0') |
| 857 | hd = hd + 1 |
| 858 | else if (hc >= ichar('a') .and. hc <= ichar('f')) then |
| 859 | hval = hval * 16 + hc - ichar('a') + 10 |
| 860 | hd = hd + 1 |
| 861 | else if (hc >= ichar('A') .and. hc <= ichar('F')) then |
| 862 | hval = hval * 16 + hc - ichar('A') + 10 |
| 863 | hd = hd + 1 |
| 864 | else |
| 865 | exit |
| 866 | end if |
| 867 | end do |
| 868 | if (hd > 0) then |
| 869 | output(output_pos:output_pos) = achar(mod(hval, 256)) |
| 870 | pos = pos + hd |
| 871 | else |
| 872 | output(output_pos:output_pos) = char(92) |
| 873 | output_pos = output_pos + 1 |
| 874 | output(output_pos:output_pos) = 'x' |
| 875 | end if |
| 876 | end block |
| 877 | case default |
| 878 | ! Unknown escape - per POSIX, output both backslash and character |
| 879 | output(output_pos:output_pos) = char(92) ! backslash |
| 880 | output_pos = output_pos + 1 |
| 881 | output(output_pos:output_pos) = escape_char |
| 882 | end select |
| 883 | |
| 884 | output_pos = output_pos + 1 |
| 885 | pos = pos + 1 |
| 886 | end subroutine |
| 887 | |
| 888 | subroutine append_to_output(output, output_pos, value) |
| 889 | character(len=*), intent(inout) :: output |
| 890 | integer, intent(inout) :: output_pos |
| 891 | character(len=*), intent(in) :: value |
| 892 | |
| 893 | integer :: val_len |
| 894 | |
| 895 | val_len = len_trim(value) |
| 896 | if (val_len == 0) return |
| 897 | |
| 898 | if (output_pos + val_len - 1 <= len(output)) then |
| 899 | output(output_pos:output_pos + val_len - 1) = value(1:val_len) |
| 900 | output_pos = output_pos + val_len |
| 901 | end if |
| 902 | end subroutine |
| 903 | |
| 904 | subroutine append_to_output_len(output, output_pos, value, value_len) |
| 905 | character(len=*), intent(inout) :: output |
| 906 | integer, intent(inout) :: output_pos |
| 907 | character(len=*), intent(in) :: value |
| 908 | integer, intent(in) :: value_len |
| 909 | |
| 910 | if (value_len <= 0) return |
| 911 | |
| 912 | if (output_pos + value_len - 1 <= len(output)) then |
| 913 | output(output_pos:output_pos + value_len - 1) = value(1:value_len) |
| 914 | output_pos = output_pos + value_len |
| 915 | end if |
| 916 | end subroutine |
| 917 | |
| 918 | function to_lowercase(str) result(lower_str) |
| 919 | character(len=*), intent(in) :: str |
| 920 | character(len=len(str)) :: lower_str |
| 921 | integer :: i |
| 922 | |
| 923 | lower_str = str |
| 924 | do i = 1, len_trim(str) |
| 925 | if (str(i:i) >= 'A' .and. str(i:i) <= 'Z') then |
| 926 | lower_str(i:i) = char(ichar(str(i:i)) + 32) |
| 927 | end if |
| 928 | end do |
| 929 | end function |
| 930 | |
| 931 | function to_uppercase(str) result(upper_str) |
| 932 | character(len=*), intent(in) :: str |
| 933 | character(len=len(str)) :: upper_str |
| 934 | integer :: i |
| 935 | |
| 936 | upper_str = str |
| 937 | do i = 1, len_trim(str) |
| 938 | if (str(i:i) >= 'a' .and. str(i:i) <= 'z') then |
| 939 | upper_str(i:i) = char(ichar(str(i:i)) - 32) |
| 940 | end if |
| 941 | end do |
| 942 | end function |
| 943 | |
| 944 | end module printf_builtin |