| 1 | /* Character set conversion support for GDB. |
| 2 | |
| 3 | Copyright (C) 2001, 2003, 2007, 2008, 2009 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "charset.h" |
| 22 | #include "gdbcmd.h" |
| 23 | #include "gdb_assert.h" |
| 24 | #include "gdb_obstack.h" |
| 25 | #include "gdb_wait.h" |
| 26 | #include "charset-list.h" |
| 27 | #include "vec.h" |
| 28 | |
| 29 | #include <stddef.h> |
| 30 | #include "gdb_string.h" |
| 31 | #include <ctype.h> |
| 32 | |
| 33 | \f |
| 34 | /* How GDB's character set support works |
| 35 | |
| 36 | GDB has three global settings: |
| 37 | |
| 38 | - The `current host character set' is the character set GDB should |
| 39 | use in talking to the user, and which (hopefully) the user's |
| 40 | terminal knows how to display properly. Most users should not |
| 41 | change this. |
| 42 | |
| 43 | - The `current target character set' is the character set the |
| 44 | program being debugged uses. |
| 45 | |
| 46 | - The `current target wide character set' is the wide character set |
| 47 | the program being debugged uses, that is, the encoding used for |
| 48 | wchar_t. |
| 49 | |
| 50 | There are commands to set each of these, and mechanisms for |
| 51 | choosing reasonable default values. GDB has a global list of |
| 52 | character sets that it can use as its host or target character |
| 53 | sets. |
| 54 | |
| 55 | The header file `charset.h' declares various functions that |
| 56 | different pieces of GDB need to perform tasks like: |
| 57 | |
| 58 | - printing target strings and characters to the user's terminal |
| 59 | (mostly target->host conversions), |
| 60 | |
| 61 | - building target-appropriate representations of strings and |
| 62 | characters the user enters in expressions (mostly host->target |
| 63 | conversions), |
| 64 | |
| 65 | and so on. |
| 66 | |
| 67 | To avoid excessive code duplication and maintenance efforts, |
| 68 | GDB simply requires a capable iconv function. Users on platforms |
| 69 | without a suitable iconv can use the GNU iconv library. */ |
| 70 | |
| 71 | \f |
| 72 | #ifdef PHONY_ICONV |
| 73 | |
| 74 | /* Provide a phony iconv that does as little as possible. Also, |
| 75 | arrange for there to be a single available character set. */ |
| 76 | |
| 77 | #undef GDB_DEFAULT_HOST_CHARSET |
| 78 | #define GDB_DEFAULT_HOST_CHARSET "ISO-8859-1" |
| 79 | #define GDB_DEFAULT_TARGET_CHARSET "ISO-8859-1" |
| 80 | #define GDB_DEFAULT_TARGET_WIDE_CHARSET "ISO-8859-1" |
| 81 | #undef DEFAULT_CHARSET_NAMES |
| 82 | #define DEFAULT_CHARSET_NAMES GDB_DEFAULT_HOST_CHARSET , |
| 83 | |
| 84 | #undef iconv_t |
| 85 | #define iconv_t int |
| 86 | #undef iconv_open |
| 87 | #undef iconv |
| 88 | #undef iconv_close |
| 89 | |
| 90 | #undef ICONV_CONST |
| 91 | #define ICONV_CONST const |
| 92 | |
| 93 | /* Some systems don't have EILSEQ, so we define it here, but not as |
| 94 | EINVAL, because callers of `iconv' want to distinguish EINVAL and |
| 95 | EILSEQ. This is what iconv.h from libiconv does as well. Note |
| 96 | that wchar.h may also define EILSEQ, so this needs to be after we |
| 97 | include wchar.h, which happens in defs.h through gdb_wchar.h. */ |
| 98 | #ifndef EILSEQ |
| 99 | #define EILSEQ ENOENT |
| 100 | #endif |
| 101 | |
| 102 | iconv_t |
| 103 | iconv_open (const char *to, const char *from) |
| 104 | { |
| 105 | /* We allow conversions from UCS-4BE, wchar_t, and the host charset. |
| 106 | We allow conversions to wchar_t and the host charset. */ |
| 107 | if (strcmp (from, "UCS-4BE") && strcmp (from, "wchar_t") |
| 108 | && strcmp (from, GDB_DEFAULT_HOST_CHARSET)) |
| 109 | return -1; |
| 110 | if (strcmp (to, "wchar_t") && strcmp (to, GDB_DEFAULT_HOST_CHARSET)) |
| 111 | return -1; |
| 112 | |
| 113 | /* Return 1 if we are converting from UCS-4BE, 0 otherwise. This is |
| 114 | used as a flag in calls to iconv. */ |
| 115 | return !strcmp (from, "UCS-4BE"); |
| 116 | } |
| 117 | |
| 118 | int |
| 119 | iconv_close (iconv_t arg) |
| 120 | { |
| 121 | return 0; |
| 122 | } |
| 123 | |
| 124 | size_t |
| 125 | iconv (iconv_t ucs_flag, const char **inbuf, size_t *inbytesleft, |
| 126 | char **outbuf, size_t *outbytesleft) |
| 127 | { |
| 128 | if (ucs_flag) |
| 129 | { |
| 130 | while (*inbytesleft >= 4) |
| 131 | { |
| 132 | size_t j; |
| 133 | unsigned long c = 0; |
| 134 | |
| 135 | for (j = 0; j < 4; ++j) |
| 136 | { |
| 137 | c <<= 8; |
| 138 | c += (*inbuf)[j] & 0xff; |
| 139 | } |
| 140 | |
| 141 | if (c >= 256) |
| 142 | { |
| 143 | errno = EILSEQ; |
| 144 | return -1; |
| 145 | } |
| 146 | **outbuf = c & 0xff; |
| 147 | ++*outbuf; |
| 148 | --*outbytesleft; |
| 149 | |
| 150 | ++*inbuf; |
| 151 | *inbytesleft -= 4; |
| 152 | } |
| 153 | if (*inbytesleft < 4) |
| 154 | { |
| 155 | errno = EINVAL; |
| 156 | return -1; |
| 157 | } |
| 158 | } |
| 159 | else |
| 160 | { |
| 161 | /* In all other cases we simply copy input bytes to the |
| 162 | output. */ |
| 163 | size_t amt = *inbytesleft; |
| 164 | if (amt > *outbytesleft) |
| 165 | amt = *outbytesleft; |
| 166 | memcpy (*outbuf, *inbuf, amt); |
| 167 | *inbuf += amt; |
| 168 | *outbuf += amt; |
| 169 | *inbytesleft -= amt; |
| 170 | *outbytesleft -= amt; |
| 171 | } |
| 172 | |
| 173 | if (*inbytesleft) |
| 174 | { |
| 175 | errno = E2BIG; |
| 176 | return -1; |
| 177 | } |
| 178 | |
| 179 | /* The number of non-reversible conversions -- but they were all |
| 180 | reversible. */ |
| 181 | return 0; |
| 182 | } |
| 183 | |
| 184 | #endif |
| 185 | |
| 186 | |
| 187 | \f |
| 188 | /* The global lists of character sets and translations. */ |
| 189 | |
| 190 | |
| 191 | #ifndef GDB_DEFAULT_TARGET_CHARSET |
| 192 | #define GDB_DEFAULT_TARGET_CHARSET "ISO-8859-1" |
| 193 | #endif |
| 194 | |
| 195 | #ifndef GDB_DEFAULT_TARGET_WIDE_CHARSET |
| 196 | #define GDB_DEFAULT_TARGET_WIDE_CHARSET "UCS-4" |
| 197 | #endif |
| 198 | |
| 199 | static const char *auto_host_charset_name = GDB_DEFAULT_HOST_CHARSET; |
| 200 | static const char *host_charset_name = "auto"; |
| 201 | static void |
| 202 | show_host_charset_name (struct ui_file *file, int from_tty, |
| 203 | struct cmd_list_element *c, |
| 204 | const char *value) |
| 205 | { |
| 206 | if (!strcmp (value, "auto")) |
| 207 | fprintf_filtered (file, |
| 208 | _("The host character set is \"auto; currently %s\".\n"), |
| 209 | auto_host_charset_name); |
| 210 | else |
| 211 | fprintf_filtered (file, _("The host character set is \"%s\".\n"), value); |
| 212 | } |
| 213 | |
| 214 | static const char *target_charset_name = GDB_DEFAULT_TARGET_CHARSET; |
| 215 | static void |
| 216 | show_target_charset_name (struct ui_file *file, int from_tty, |
| 217 | struct cmd_list_element *c, const char *value) |
| 218 | { |
| 219 | fprintf_filtered (file, _("The target character set is \"%s\".\n"), |
| 220 | value); |
| 221 | } |
| 222 | |
| 223 | static const char *target_wide_charset_name = GDB_DEFAULT_TARGET_WIDE_CHARSET; |
| 224 | static void |
| 225 | show_target_wide_charset_name (struct ui_file *file, int from_tty, |
| 226 | struct cmd_list_element *c, const char *value) |
| 227 | { |
| 228 | fprintf_filtered (file, _("The target wide character set is \"%s\".\n"), |
| 229 | value); |
| 230 | } |
| 231 | |
| 232 | static const char *default_charset_names[] = |
| 233 | { |
| 234 | DEFAULT_CHARSET_NAMES |
| 235 | 0 |
| 236 | }; |
| 237 | |
| 238 | static const char **charset_enum; |
| 239 | |
| 240 | \f |
| 241 | /* If the target wide character set has big- or little-endian |
| 242 | variants, these are the corresponding names. */ |
| 243 | static const char *target_wide_charset_be_name; |
| 244 | static const char *target_wide_charset_le_name; |
| 245 | |
| 246 | /* A helper function for validate which sets the target wide big- and |
| 247 | little-endian character set names, if possible. */ |
| 248 | |
| 249 | static void |
| 250 | set_be_le_names (void) |
| 251 | { |
| 252 | int i, len; |
| 253 | |
| 254 | target_wide_charset_le_name = NULL; |
| 255 | target_wide_charset_be_name = NULL; |
| 256 | |
| 257 | len = strlen (target_wide_charset_name); |
| 258 | for (i = 0; charset_enum[i]; ++i) |
| 259 | { |
| 260 | if (strncmp (target_wide_charset_name, charset_enum[i], len)) |
| 261 | continue; |
| 262 | if ((charset_enum[i][len] == 'B' |
| 263 | || charset_enum[i][len] == 'L') |
| 264 | && charset_enum[i][len + 1] == 'E' |
| 265 | && charset_enum[i][len + 2] == '\0') |
| 266 | { |
| 267 | if (charset_enum[i][len] == 'B') |
| 268 | target_wide_charset_be_name = charset_enum[i]; |
| 269 | else |
| 270 | target_wide_charset_le_name = charset_enum[i]; |
| 271 | } |
| 272 | } |
| 273 | } |
| 274 | |
| 275 | /* 'Set charset', 'set host-charset', 'set target-charset', 'set |
| 276 | target-wide-charset', 'set charset' sfunc's. */ |
| 277 | |
| 278 | static void |
| 279 | validate (void) |
| 280 | { |
| 281 | iconv_t desc; |
| 282 | const char *host_cset = host_charset (); |
| 283 | |
| 284 | desc = iconv_open (target_wide_charset_name, host_cset); |
| 285 | if (desc == (iconv_t) -1) |
| 286 | error ("Cannot convert between character sets `%s' and `%s'", |
| 287 | target_wide_charset_name, host_cset); |
| 288 | iconv_close (desc); |
| 289 | |
| 290 | desc = iconv_open (target_charset_name, host_cset); |
| 291 | if (desc == (iconv_t) -1) |
| 292 | error ("Cannot convert between character sets `%s' and `%s'", |
| 293 | target_charset_name, host_cset); |
| 294 | iconv_close (desc); |
| 295 | |
| 296 | set_be_le_names (); |
| 297 | } |
| 298 | |
| 299 | /* This is the sfunc for the 'set charset' command. */ |
| 300 | static void |
| 301 | set_charset_sfunc (char *charset, int from_tty, struct cmd_list_element *c) |
| 302 | { |
| 303 | /* CAREFUL: set the target charset here as well. */ |
| 304 | target_charset_name = host_charset_name; |
| 305 | validate (); |
| 306 | } |
| 307 | |
| 308 | /* 'set host-charset' command sfunc. We need a wrapper here because |
| 309 | the function needs to have a specific signature. */ |
| 310 | static void |
| 311 | set_host_charset_sfunc (char *charset, int from_tty, |
| 312 | struct cmd_list_element *c) |
| 313 | { |
| 314 | validate (); |
| 315 | } |
| 316 | |
| 317 | /* Wrapper for the 'set target-charset' command. */ |
| 318 | static void |
| 319 | set_target_charset_sfunc (char *charset, int from_tty, |
| 320 | struct cmd_list_element *c) |
| 321 | { |
| 322 | validate (); |
| 323 | } |
| 324 | |
| 325 | /* Wrapper for the 'set target-wide-charset' command. */ |
| 326 | static void |
| 327 | set_target_wide_charset_sfunc (char *charset, int from_tty, |
| 328 | struct cmd_list_element *c) |
| 329 | { |
| 330 | validate (); |
| 331 | } |
| 332 | |
| 333 | /* sfunc for the 'show charset' command. */ |
| 334 | static void |
| 335 | show_charset (struct ui_file *file, int from_tty, struct cmd_list_element *c, |
| 336 | const char *name) |
| 337 | { |
| 338 | show_host_charset_name (file, from_tty, c, host_charset_name); |
| 339 | show_target_charset_name (file, from_tty, c, target_charset_name); |
| 340 | show_target_wide_charset_name (file, from_tty, c, target_wide_charset_name); |
| 341 | } |
| 342 | |
| 343 | \f |
| 344 | /* Accessor functions. */ |
| 345 | |
| 346 | const char * |
| 347 | host_charset (void) |
| 348 | { |
| 349 | if (!strcmp (host_charset_name, "auto")) |
| 350 | return auto_host_charset_name; |
| 351 | return host_charset_name; |
| 352 | } |
| 353 | |
| 354 | const char * |
| 355 | target_charset (void) |
| 356 | { |
| 357 | return target_charset_name; |
| 358 | } |
| 359 | |
| 360 | const char * |
| 361 | target_wide_charset (enum bfd_endian byte_order) |
| 362 | { |
| 363 | if (byte_order == BFD_ENDIAN_BIG) |
| 364 | { |
| 365 | if (target_wide_charset_be_name) |
| 366 | return target_wide_charset_be_name; |
| 367 | } |
| 368 | else |
| 369 | { |
| 370 | if (target_wide_charset_le_name) |
| 371 | return target_wide_charset_le_name; |
| 372 | } |
| 373 | |
| 374 | return target_wide_charset_name; |
| 375 | } |
| 376 | |
| 377 | \f |
| 378 | /* Host character set management. For the time being, we assume that |
| 379 | the host character set is some superset of ASCII. */ |
| 380 | |
| 381 | char |
| 382 | host_letter_to_control_character (char c) |
| 383 | { |
| 384 | if (c == '?') |
| 385 | return 0177; |
| 386 | return c & 0237; |
| 387 | } |
| 388 | |
| 389 | /* Convert a host character, C, to its hex value. C must already have |
| 390 | been validated using isxdigit. */ |
| 391 | |
| 392 | int |
| 393 | host_hex_value (char c) |
| 394 | { |
| 395 | if (isdigit (c)) |
| 396 | return c - '0'; |
| 397 | if (c >= 'a' && c <= 'f') |
| 398 | return 10 + c - 'a'; |
| 399 | gdb_assert (c >= 'A' && c <= 'F'); |
| 400 | return 10 + c - 'A'; |
| 401 | } |
| 402 | |
| 403 | \f |
| 404 | /* Public character management functions. */ |
| 405 | |
| 406 | /* A cleanup function which is run to close an iconv descriptor. */ |
| 407 | |
| 408 | static void |
| 409 | cleanup_iconv (void *p) |
| 410 | { |
| 411 | iconv_t *descp = p; |
| 412 | iconv_close (*descp); |
| 413 | } |
| 414 | |
| 415 | void |
| 416 | convert_between_encodings (const char *from, const char *to, |
| 417 | const gdb_byte *bytes, unsigned int num_bytes, |
| 418 | int width, struct obstack *output, |
| 419 | enum transliterations translit) |
| 420 | { |
| 421 | iconv_t desc; |
| 422 | struct cleanup *cleanups; |
| 423 | size_t inleft; |
| 424 | char *inp; |
| 425 | unsigned int space_request; |
| 426 | |
| 427 | /* Often, the host and target charsets will be the same. */ |
| 428 | if (!strcmp (from, to)) |
| 429 | { |
| 430 | obstack_grow (output, bytes, num_bytes); |
| 431 | return; |
| 432 | } |
| 433 | |
| 434 | desc = iconv_open (to, from); |
| 435 | if (desc == (iconv_t) -1) |
| 436 | perror_with_name ("Converting character sets"); |
| 437 | cleanups = make_cleanup (cleanup_iconv, &desc); |
| 438 | |
| 439 | inleft = num_bytes; |
| 440 | inp = (char *) bytes; |
| 441 | |
| 442 | space_request = num_bytes; |
| 443 | |
| 444 | while (inleft > 0) |
| 445 | { |
| 446 | char *outp; |
| 447 | size_t outleft, r; |
| 448 | int old_size; |
| 449 | |
| 450 | old_size = obstack_object_size (output); |
| 451 | obstack_blank (output, space_request); |
| 452 | |
| 453 | outp = obstack_base (output) + old_size; |
| 454 | outleft = space_request; |
| 455 | |
| 456 | r = iconv (desc, (ICONV_CONST char **) &inp, &inleft, &outp, &outleft); |
| 457 | |
| 458 | /* Now make sure that the object on the obstack only includes |
| 459 | bytes we have converted. */ |
| 460 | obstack_blank (output, - (int) outleft); |
| 461 | |
| 462 | if (r == (size_t) -1) |
| 463 | { |
| 464 | switch (errno) |
| 465 | { |
| 466 | case EILSEQ: |
| 467 | { |
| 468 | int i; |
| 469 | |
| 470 | /* Invalid input sequence. */ |
| 471 | if (translit == translit_none) |
| 472 | error (_("Could not convert character to `%s' character set"), |
| 473 | to); |
| 474 | |
| 475 | /* We emit escape sequence for the bytes, skip them, |
| 476 | and try again. */ |
| 477 | for (i = 0; i < width; ++i) |
| 478 | { |
| 479 | char octal[5]; |
| 480 | |
| 481 | sprintf (octal, "\\%.3o", *inp & 0xff); |
| 482 | obstack_grow_str (output, octal); |
| 483 | |
| 484 | ++inp; |
| 485 | --inleft; |
| 486 | } |
| 487 | } |
| 488 | break; |
| 489 | |
| 490 | case E2BIG: |
| 491 | /* We ran out of space in the output buffer. Make it |
| 492 | bigger next time around. */ |
| 493 | space_request *= 2; |
| 494 | break; |
| 495 | |
| 496 | case EINVAL: |
| 497 | /* Incomplete input sequence. FIXME: ought to report this |
| 498 | to the caller somehow. */ |
| 499 | inleft = 0; |
| 500 | break; |
| 501 | |
| 502 | default: |
| 503 | perror_with_name ("Internal error while converting character sets"); |
| 504 | } |
| 505 | } |
| 506 | } |
| 507 | |
| 508 | do_cleanups (cleanups); |
| 509 | } |
| 510 | |
| 511 | \f |
| 512 | |
| 513 | /* An iterator that returns host wchar_t's from a target string. */ |
| 514 | struct wchar_iterator |
| 515 | { |
| 516 | /* The underlying iconv descriptor. */ |
| 517 | iconv_t desc; |
| 518 | |
| 519 | /* The input string. This is updated as convert characters. */ |
| 520 | char *input; |
| 521 | /* The number of bytes remaining in the input. */ |
| 522 | size_t bytes; |
| 523 | |
| 524 | /* The width of an input character. */ |
| 525 | size_t width; |
| 526 | |
| 527 | /* The output buffer and its size. */ |
| 528 | gdb_wchar_t *out; |
| 529 | size_t out_size; |
| 530 | }; |
| 531 | |
| 532 | /* Create a new iterator. */ |
| 533 | struct wchar_iterator * |
| 534 | make_wchar_iterator (const gdb_byte *input, size_t bytes, const char *charset, |
| 535 | size_t width) |
| 536 | { |
| 537 | struct wchar_iterator *result; |
| 538 | iconv_t desc; |
| 539 | |
| 540 | desc = iconv_open (INTERMEDIATE_ENCODING, charset); |
| 541 | if (desc == (iconv_t) -1) |
| 542 | perror_with_name ("Converting character sets"); |
| 543 | |
| 544 | result = XNEW (struct wchar_iterator); |
| 545 | result->desc = desc; |
| 546 | result->input = (char *) input; |
| 547 | result->bytes = bytes; |
| 548 | result->width = width; |
| 549 | |
| 550 | result->out = XNEW (gdb_wchar_t); |
| 551 | result->out_size = 1; |
| 552 | |
| 553 | return result; |
| 554 | } |
| 555 | |
| 556 | static void |
| 557 | do_cleanup_iterator (void *p) |
| 558 | { |
| 559 | struct wchar_iterator *iter = p; |
| 560 | |
| 561 | iconv_close (iter->desc); |
| 562 | xfree (iter->out); |
| 563 | xfree (iter); |
| 564 | } |
| 565 | |
| 566 | struct cleanup * |
| 567 | make_cleanup_wchar_iterator (struct wchar_iterator *iter) |
| 568 | { |
| 569 | return make_cleanup (do_cleanup_iterator, iter); |
| 570 | } |
| 571 | |
| 572 | int |
| 573 | wchar_iterate (struct wchar_iterator *iter, |
| 574 | enum wchar_iterate_result *out_result, |
| 575 | gdb_wchar_t **out_chars, |
| 576 | const gdb_byte **ptr, |
| 577 | size_t *len) |
| 578 | { |
| 579 | size_t out_request; |
| 580 | |
| 581 | /* Try to convert some characters. At first we try to convert just |
| 582 | a single character. The reason for this is that iconv does not |
| 583 | necessarily update its outgoing arguments when it encounters an |
| 584 | invalid input sequence -- but we want to reliably report this to |
| 585 | our caller so it can emit an escape sequence. */ |
| 586 | out_request = 1; |
| 587 | while (iter->bytes > 0) |
| 588 | { |
| 589 | char *outptr = (char *) &iter->out[0]; |
| 590 | char *orig_inptr = iter->input; |
| 591 | size_t orig_in = iter->bytes; |
| 592 | size_t out_avail = out_request * sizeof (gdb_wchar_t); |
| 593 | size_t num; |
| 594 | gdb_wchar_t result; |
| 595 | |
| 596 | size_t r = iconv (iter->desc, |
| 597 | (ICONV_CONST char **) &iter->input, &iter->bytes, |
| 598 | &outptr, &out_avail); |
| 599 | if (r == (size_t) -1) |
| 600 | { |
| 601 | switch (errno) |
| 602 | { |
| 603 | case EILSEQ: |
| 604 | /* Invalid input sequence. Skip it, and let the caller |
| 605 | know about it. */ |
| 606 | *out_result = wchar_iterate_invalid; |
| 607 | *ptr = iter->input; |
| 608 | *len = iter->width; |
| 609 | iter->input += iter->width; |
| 610 | iter->bytes -= iter->width; |
| 611 | return 0; |
| 612 | |
| 613 | case E2BIG: |
| 614 | /* We ran out of space. We still might have converted a |
| 615 | character; if so, return it. Otherwise, grow the |
| 616 | buffer and try again. */ |
| 617 | if (out_avail < out_request * sizeof (gdb_wchar_t)) |
| 618 | break; |
| 619 | |
| 620 | ++out_request; |
| 621 | if (out_request > iter->out_size) |
| 622 | { |
| 623 | iter->out_size = out_request; |
| 624 | iter->out = xrealloc (iter->out, |
| 625 | out_request * sizeof (gdb_wchar_t)); |
| 626 | } |
| 627 | continue; |
| 628 | |
| 629 | case EINVAL: |
| 630 | /* Incomplete input sequence. Let the caller know, and |
| 631 | arrange for future calls to see EOF. */ |
| 632 | *out_result = wchar_iterate_incomplete; |
| 633 | *ptr = iter->input; |
| 634 | *len = iter->bytes; |
| 635 | iter->bytes = 0; |
| 636 | return 0; |
| 637 | |
| 638 | default: |
| 639 | perror_with_name ("Internal error while converting character sets"); |
| 640 | } |
| 641 | } |
| 642 | |
| 643 | /* We converted something. */ |
| 644 | num = out_request - out_avail / sizeof (gdb_wchar_t); |
| 645 | *out_result = wchar_iterate_ok; |
| 646 | *out_chars = iter->out; |
| 647 | *ptr = orig_inptr; |
| 648 | *len = orig_in - iter->bytes; |
| 649 | return num; |
| 650 | } |
| 651 | |
| 652 | /* Really done. */ |
| 653 | *out_result = wchar_iterate_eof; |
| 654 | return -1; |
| 655 | } |
| 656 | |
| 657 | \f |
| 658 | /* The charset.c module initialization function. */ |
| 659 | |
| 660 | extern initialize_file_ftype _initialize_charset; /* -Wmissing-prototype */ |
| 661 | |
| 662 | typedef char *char_ptr; |
| 663 | DEF_VEC_P (char_ptr); |
| 664 | |
| 665 | static VEC (char_ptr) *charsets; |
| 666 | |
| 667 | #ifdef PHONY_ICONV |
| 668 | |
| 669 | static void |
| 670 | find_charset_names (void) |
| 671 | { |
| 672 | VEC_safe_push (char_ptr, charsets, GDB_DEFAULT_HOST_CHARSET); |
| 673 | VEC_safe_push (char_ptr, charsets, NULL); |
| 674 | } |
| 675 | |
| 676 | #else /* PHONY_ICONV */ |
| 677 | |
| 678 | /* Sometimes, libiconv redefines iconvlist as libiconvlist -- but |
| 679 | provides different symbols in the static and dynamic libraries. |
| 680 | So, configure may see libiconvlist but not iconvlist. But, calling |
| 681 | iconvlist is the right thing to do and will work. Hence we do a |
| 682 | check here but unconditionally call iconvlist below. */ |
| 683 | #if defined (HAVE_ICONVLIST) || defined (HAVE_LIBICONVLIST) |
| 684 | |
| 685 | /* A helper function that adds some character sets to the vector of |
| 686 | all character sets. This is a callback function for iconvlist. */ |
| 687 | |
| 688 | static int |
| 689 | add_one (unsigned int count, const char *const *names, void *data) |
| 690 | { |
| 691 | unsigned int i; |
| 692 | |
| 693 | for (i = 0; i < count; ++i) |
| 694 | VEC_safe_push (char_ptr, charsets, xstrdup (names[i])); |
| 695 | |
| 696 | return 0; |
| 697 | } |
| 698 | |
| 699 | static void |
| 700 | find_charset_names (void) |
| 701 | { |
| 702 | iconvlist (add_one, NULL); |
| 703 | VEC_safe_push (char_ptr, charsets, NULL); |
| 704 | } |
| 705 | |
| 706 | #else |
| 707 | |
| 708 | static void |
| 709 | find_charset_names (void) |
| 710 | { |
| 711 | struct pex_obj *child; |
| 712 | char *args[3]; |
| 713 | int err, status; |
| 714 | int fail = 1; |
| 715 | |
| 716 | child = pex_init (0, "iconv", NULL); |
| 717 | |
| 718 | args[0] = "iconv"; |
| 719 | args[1] = "-l"; |
| 720 | args[2] = NULL; |
| 721 | /* Note that we simply ignore errors here. */ |
| 722 | if (!pex_run (child, PEX_SEARCH | PEX_STDERR_TO_STDOUT, "iconv", |
| 723 | args, NULL, NULL, &err)) |
| 724 | { |
| 725 | FILE *in = pex_read_output (child, 0); |
| 726 | |
| 727 | /* POSIX says that iconv -l uses an unspecified format. We |
| 728 | parse the glibc and libiconv formats; feel free to add others |
| 729 | as needed. */ |
| 730 | while (!feof (in)) |
| 731 | { |
| 732 | /* The size of buf is chosen arbitrarily. */ |
| 733 | char buf[1024]; |
| 734 | char *start, *r; |
| 735 | int len, keep_going; |
| 736 | |
| 737 | r = fgets (buf, sizeof (buf), in); |
| 738 | if (!r) |
| 739 | break; |
| 740 | len = strlen (r); |
| 741 | if (len <= 3) |
| 742 | continue; |
| 743 | /* Strip off the newline. */ |
| 744 | --len; |
| 745 | /* Strip off one or two '/'s. glibc will print lines like |
| 746 | "8859_7//", but also "10646-1:1993/UCS4/". */ |
| 747 | if (buf[len - 1] == '/') |
| 748 | --len; |
| 749 | if (buf[len - 1] == '/') |
| 750 | --len; |
| 751 | buf[len] = '\0'; |
| 752 | |
| 753 | /* libiconv will print multiple entries per line, separated |
| 754 | by spaces. */ |
| 755 | start = buf; |
| 756 | while (1) |
| 757 | { |
| 758 | int keep_going; |
| 759 | char *p; |
| 760 | |
| 761 | /* Find the next space, or end-of-line. */ |
| 762 | for (p = start; *p && *p != ' '; ++p) |
| 763 | ; |
| 764 | /* Ignore an empty result. */ |
| 765 | if (p == start) |
| 766 | break; |
| 767 | keep_going = *p; |
| 768 | *p = '\0'; |
| 769 | VEC_safe_push (char_ptr, charsets, xstrdup (start)); |
| 770 | if (!keep_going) |
| 771 | break; |
| 772 | /* Skip any extra spaces. */ |
| 773 | for (start = p + 1; *start && *start == ' '; ++start) |
| 774 | ; |
| 775 | } |
| 776 | } |
| 777 | |
| 778 | if (pex_get_status (child, 1, &status) |
| 779 | && WIFEXITED (status) && !WEXITSTATUS (status)) |
| 780 | fail = 0; |
| 781 | |
| 782 | } |
| 783 | |
| 784 | pex_free (child); |
| 785 | |
| 786 | if (fail) |
| 787 | { |
| 788 | /* Some error occurred, so drop the vector. */ |
| 789 | int ix; |
| 790 | char *elt; |
| 791 | for (ix = 0; VEC_iterate (char_ptr, charsets, ix, elt); ++ix) |
| 792 | xfree (elt); |
| 793 | VEC_truncate (char_ptr, charsets, 0); |
| 794 | } |
| 795 | else |
| 796 | VEC_safe_push (char_ptr, charsets, NULL); |
| 797 | } |
| 798 | |
| 799 | #endif /* HAVE_ICONVLIST || HAVE_LIBICONVLIST */ |
| 800 | #endif /* PHONY_ICONV */ |
| 801 | |
| 802 | void |
| 803 | _initialize_charset (void) |
| 804 | { |
| 805 | struct cmd_list_element *new_cmd; |
| 806 | |
| 807 | /* The first element is always "auto"; then we skip it for the |
| 808 | commands where it is not allowed. */ |
| 809 | VEC_safe_push (char_ptr, charsets, xstrdup ("auto")); |
| 810 | find_charset_names (); |
| 811 | |
| 812 | if (VEC_length (char_ptr, charsets) > 1) |
| 813 | charset_enum = (const char **) VEC_address (char_ptr, charsets); |
| 814 | else |
| 815 | charset_enum = default_charset_names; |
| 816 | |
| 817 | #ifndef PHONY_ICONV |
| 818 | #ifdef HAVE_LANGINFO_CODESET |
| 819 | auto_host_charset_name = nl_langinfo (CODESET); |
| 820 | /* Solaris will return `646' here -- but the Solaris iconv then |
| 821 | does not accept this. */ |
| 822 | if (!strcmp (auto_host_charset_name, "646")) |
| 823 | auto_host_charset_name = "ASCII"; |
| 824 | target_charset_name = auto_host_charset_name; |
| 825 | |
| 826 | set_be_le_names (); |
| 827 | #endif |
| 828 | #endif |
| 829 | |
| 830 | add_setshow_enum_cmd ("charset", class_support, |
| 831 | &charset_enum[1], &host_charset_name, _("\ |
| 832 | Set the host and target character sets."), _("\ |
| 833 | Show the host and target character sets."), _("\ |
| 834 | The `host character set' is the one used by the system GDB is running on.\n\ |
| 835 | The `target character set' is the one used by the program being debugged.\n\ |
| 836 | You may only use supersets of ASCII for your host character set; GDB does\n\ |
| 837 | not support any others.\n\ |
| 838 | To see a list of the character sets GDB supports, type `set charset <TAB>'."), |
| 839 | /* Note that the sfunc below needs to set |
| 840 | target_charset_name, because the 'set |
| 841 | charset' command sets two variables. */ |
| 842 | set_charset_sfunc, |
| 843 | show_charset, |
| 844 | &setlist, &showlist); |
| 845 | |
| 846 | add_setshow_enum_cmd ("host-charset", class_support, |
| 847 | charset_enum, &host_charset_name, _("\ |
| 848 | Set the host character set."), _("\ |
| 849 | Show the host character set."), _("\ |
| 850 | The `host character set' is the one used by the system GDB is running on.\n\ |
| 851 | You may only use supersets of ASCII for your host character set; GDB does\n\ |
| 852 | not support any others.\n\ |
| 853 | To see a list of the character sets GDB supports, type `set host-charset <TAB>'."), |
| 854 | set_host_charset_sfunc, |
| 855 | show_host_charset_name, |
| 856 | &setlist, &showlist); |
| 857 | |
| 858 | add_setshow_enum_cmd ("target-charset", class_support, |
| 859 | &charset_enum[1], &target_charset_name, _("\ |
| 860 | Set the target character set."), _("\ |
| 861 | Show the target character set."), _("\ |
| 862 | The `target character set' is the one used by the program being debugged.\n\ |
| 863 | GDB translates characters and strings between the host and target\n\ |
| 864 | character sets as needed.\n\ |
| 865 | To see a list of the character sets GDB supports, type `set target-charset'<TAB>"), |
| 866 | set_target_charset_sfunc, |
| 867 | show_target_charset_name, |
| 868 | &setlist, &showlist); |
| 869 | |
| 870 | add_setshow_enum_cmd ("target-wide-charset", class_support, |
| 871 | &charset_enum[1], &target_wide_charset_name, |
| 872 | _("\ |
| 873 | Set the target wide character set."), _("\ |
| 874 | Show the target wide character set."), _("\ |
| 875 | The `target wide character set' is the one used by the program being debugged.\n\ |
| 876 | In particular it is the encoding used by `wchar_t'.\n\ |
| 877 | GDB translates characters and strings between the host and target\n\ |
| 878 | character sets as needed.\n\ |
| 879 | To see a list of the character sets GDB supports, type\n\ |
| 880 | `set target-wide-charset'<TAB>"), |
| 881 | set_target_wide_charset_sfunc, |
| 882 | show_target_wide_charset_name, |
| 883 | &setlist, &showlist); |
| 884 | } |