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1 | /* Convert text in given files from the specified from-set to the to-set. | |
2 | Copyright (C) 1998-2019 Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published | |
8 | by the Free Software Foundation; version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, see <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <argp.h> | |
20 | #include <assert.h> | |
21 | #include <ctype.h> | |
22 | #include <errno.h> | |
23 | #include <error.h> | |
24 | #include <fcntl.h> | |
25 | #include <iconv.h> | |
26 | #include <langinfo.h> | |
27 | #include <locale.h> | |
28 | #include <search.h> | |
29 | #include <stdbool.h> | |
30 | #include <stdio.h> | |
31 | #include <stdlib.h> | |
32 | #include <string.h> | |
33 | #include <unistd.h> | |
34 | #include <libintl.h> | |
35 | #ifdef _POSIX_MAPPED_FILES | |
36 | # include <sys/mman.h> | |
37 | #endif | |
38 | #include <charmap.h> | |
39 | #include <gconv_int.h> | |
40 | #include "iconv_prog.h" | |
41 | #include "iconvconfig.h" | |
42 | ||
43 | /* Get libc version number. */ | |
44 | #include "../version.h" | |
45 | ||
46 | #define PACKAGE _libc_intl_domainname | |
47 | ||
48 | ||
49 | /* Name and version of program. */ | |
50 | static void print_version (FILE *stream, struct argp_state *state); | |
51 | void (*argp_program_version_hook) (FILE *, struct argp_state *) = print_version; | |
52 | ||
53 | #define OPT_VERBOSE 1000 | |
54 | #define OPT_LIST 'l' | |
55 | ||
56 | /* Definitions of arguments for argp functions. */ | |
57 | static const struct argp_option options[] = | |
58 | { | |
59 | { NULL, 0, NULL, 0, N_("Input/Output format specification:") }, | |
60 | { "from-code", 'f', N_("NAME"), 0, N_("encoding of original text") }, | |
61 | { "to-code", 't', N_("NAME"), 0, N_("encoding for output") }, | |
62 | { NULL, 0, NULL, 0, N_("Information:") }, | |
63 | { "list", 'l', NULL, 0, N_("list all known coded character sets") }, | |
64 | { NULL, 0, NULL, 0, N_("Output control:") }, | |
65 | { NULL, 'c', NULL, 0, N_("omit invalid characters from output") }, | |
66 | { "output", 'o', N_("FILE"), 0, N_("output file") }, | |
67 | { "silent", 's', NULL, 0, N_("suppress warnings") }, | |
68 | { "verbose", OPT_VERBOSE, NULL, 0, N_("print progress information") }, | |
69 | { NULL, 0, NULL, 0, NULL } | |
70 | }; | |
71 | ||
72 | /* Short description of program. */ | |
73 | static const char doc[] = N_("\ | |
74 | Convert encoding of given files from one encoding to another."); | |
75 | ||
76 | /* Strings for arguments in help texts. */ | |
77 | static const char args_doc[] = N_("[FILE...]"); | |
78 | ||
79 | /* Prototype for option handler. */ | |
80 | static error_t parse_opt (int key, char *arg, struct argp_state *state); | |
81 | ||
82 | /* Function to print some extra text in the help message. */ | |
83 | static char *more_help (int key, const char *text, void *input); | |
84 | ||
85 | /* Data structure to communicate with argp functions. */ | |
86 | static struct argp argp = | |
87 | { | |
88 | options, parse_opt, args_doc, doc, NULL, more_help | |
89 | }; | |
90 | ||
91 | /* Code sets to convert from and to respectively. An empty string as the | |
92 | default causes the 'iconv_open' function to look up the charset of the | |
93 | currently selected locale and use it. */ | |
94 | static const char *from_code = ""; | |
95 | static const char *to_code = ""; | |
96 | ||
97 | /* File to write output to. If NULL write to stdout. */ | |
98 | static const char *output_file; | |
99 | ||
100 | /* Nonzero if list of all coded character sets is wanted. */ | |
101 | static int list; | |
102 | ||
103 | /* If nonzero omit invalid character from output. */ | |
104 | int omit_invalid; | |
105 | ||
106 | /* Prototypes for the functions doing the actual work. */ | |
107 | static int process_block (iconv_t cd, char *addr, size_t len, FILE **output, | |
108 | const char *output_file); | |
109 | static int process_fd (iconv_t cd, int fd, FILE **output, | |
110 | const char *output_file); | |
111 | static int process_file (iconv_t cd, FILE *input, FILE **output, | |
112 | const char *output_file); | |
113 | static void print_known_names (void); | |
114 | ||
115 | ||
116 | int | |
117 | main (int argc, char *argv[]) | |
118 | { | |
119 | int status = EXIT_SUCCESS; | |
120 | int remaining; | |
121 | iconv_t cd; | |
122 | const char *orig_to_code; | |
123 | struct charmap_t *from_charmap = NULL; | |
124 | struct charmap_t *to_charmap = NULL; | |
125 | ||
126 | /* Set locale via LC_ALL. */ | |
127 | setlocale (LC_ALL, ""); | |
128 | ||
129 | /* Set the text message domain. */ | |
130 | textdomain (_libc_intl_domainname); | |
131 | ||
132 | /* Parse and process arguments. */ | |
133 | argp_parse (&argp, argc, argv, 0, &remaining, NULL); | |
134 | ||
135 | /* List all coded character sets if wanted. */ | |
136 | if (list) | |
137 | { | |
138 | print_known_names (); | |
139 | exit (EXIT_SUCCESS); | |
140 | } | |
141 | ||
142 | /* If we have to ignore errors make sure we use the appropriate name for | |
143 | the to-character-set. */ | |
144 | orig_to_code = to_code; | |
145 | if (omit_invalid) | |
146 | { | |
147 | const char *errhand = strchrnul (to_code, '/'); | |
148 | int nslash = 2; | |
149 | char *newp; | |
150 | char *cp; | |
151 | ||
152 | if (*errhand == '/') | |
153 | { | |
154 | --nslash; | |
155 | errhand = strchrnul (errhand + 1, '/'); | |
156 | ||
157 | if (*errhand == '/') | |
158 | { | |
159 | --nslash; | |
160 | errhand = strchr (errhand, '\0'); | |
161 | } | |
162 | } | |
163 | ||
164 | newp = (char *) alloca (errhand - to_code + nslash + 7 + 1); | |
165 | cp = mempcpy (newp, to_code, errhand - to_code); | |
166 | while (nslash-- > 0) | |
167 | *cp++ = '/'; | |
168 | if (cp[-1] != '/') | |
169 | *cp++ = ','; | |
170 | memcpy (cp, "IGNORE", sizeof ("IGNORE")); | |
171 | ||
172 | to_code = newp; | |
173 | } | |
174 | ||
175 | /* POSIX 1003.2b introduces a silly thing: the arguments to -t anf -f | |
176 | can be file names of charmaps. In this case iconv will have to read | |
177 | those charmaps and use them to do the conversion. But there are | |
178 | holes in the specification. There is nothing said that if -f is a | |
179 | charmap filename that -t must be, too. And vice versa. There is | |
180 | also no word about the symbolic names used. What if they don't | |
181 | match? */ | |
182 | if (strchr (from_code, '/') != NULL) | |
183 | /* The from-name might be a charmap file name. Try reading the | |
184 | file. */ | |
185 | from_charmap = charmap_read (from_code, /*0, 1*/1, 0, 0, 0); | |
186 | ||
187 | if (strchr (orig_to_code, '/') != NULL) | |
188 | /* The to-name might be a charmap file name. Try reading the | |
189 | file. */ | |
190 | to_charmap = charmap_read (orig_to_code, /*0, 1,*/1, 0, 0, 0); | |
191 | ||
192 | ||
193 | /* At this point we have to handle two cases. The first one is | |
194 | where a charmap is used for the from- or to-charset, or both. We | |
195 | handle this special since it is very different from the sane way of | |
196 | doing things. The other case allows converting using the iconv() | |
197 | function. */ | |
198 | if (from_charmap != NULL || to_charmap != NULL) | |
199 | /* Construct the conversion table and do the conversion. */ | |
200 | status = charmap_conversion (from_code, from_charmap, to_code, to_charmap, | |
201 | argc, remaining, argv, output_file); | |
202 | else | |
203 | { | |
204 | /* Let's see whether we have these coded character sets. */ | |
205 | cd = iconv_open (to_code, from_code); | |
206 | if (cd == (iconv_t) -1) | |
207 | { | |
208 | if (errno == EINVAL) | |
209 | { | |
210 | /* Try to be nice with the user and tell her which of the | |
211 | two encoding names is wrong. This is possible because | |
212 | all supported encodings can be converted from/to Unicode, | |
213 | in other words, because the graph of encodings is | |
214 | connected. */ | |
215 | bool from_wrong = | |
216 | (iconv_open ("UTF-8", from_code) == (iconv_t) -1 | |
217 | && errno == EINVAL); | |
218 | bool to_wrong = | |
219 | (iconv_open (to_code, "UTF-8") == (iconv_t) -1 | |
220 | && errno == EINVAL); | |
221 | const char *from_pretty = | |
222 | (from_code[0] ? from_code : nl_langinfo (CODESET)); | |
223 | const char *to_pretty = | |
224 | (orig_to_code[0] ? orig_to_code : nl_langinfo (CODESET)); | |
225 | ||
226 | if (from_wrong) | |
227 | { | |
228 | if (to_wrong) | |
229 | error (0, 0, | |
230 | _("\ | |
231 | conversions from `%s' and to `%s' are not supported"), | |
232 | from_pretty, to_pretty); | |
233 | else | |
234 | error (0, 0, | |
235 | _("conversion from `%s' is not supported"), | |
236 | from_pretty); | |
237 | } | |
238 | else | |
239 | { | |
240 | if (to_wrong) | |
241 | error (0, 0, | |
242 | _("conversion to `%s' is not supported"), | |
243 | to_pretty); | |
244 | else | |
245 | error (0, 0, | |
246 | _("conversion from `%s' to `%s' is not supported"), | |
247 | from_pretty, to_pretty); | |
248 | } | |
249 | ||
250 | argp_help (&argp, stderr, ARGP_HELP_SEE, | |
251 | program_invocation_short_name); | |
252 | exit (1); | |
253 | } | |
254 | else | |
255 | error (EXIT_FAILURE, errno, | |
256 | _("failed to start conversion processing")); | |
257 | } | |
258 | ||
259 | /* The output file. Will be opened when we are ready to produce | |
260 | output. */ | |
261 | FILE *output = NULL; | |
262 | ||
263 | /* Now process the remaining files. Write them to stdout or the file | |
264 | specified with the `-o' parameter. If we have no file given as | |
265 | the parameter process all from stdin. */ | |
266 | if (remaining == argc) | |
267 | { | |
268 | if (process_file (cd, stdin, &output, output_file) != 0) | |
269 | status = EXIT_FAILURE; | |
270 | } | |
271 | else | |
272 | do | |
273 | { | |
274 | #ifdef _POSIX_MAPPED_FILES | |
275 | struct stat64 st; | |
276 | char *addr; | |
277 | #endif | |
278 | int fd, ret; | |
279 | ||
280 | if (verbose) | |
281 | fprintf (stderr, "%s:\n", argv[remaining]); | |
282 | if (strcmp (argv[remaining], "-") == 0) | |
283 | fd = 0; | |
284 | else | |
285 | { | |
286 | fd = open (argv[remaining], O_RDONLY); | |
287 | ||
288 | if (fd == -1) | |
289 | { | |
290 | error (0, errno, _("cannot open input file `%s'"), | |
291 | argv[remaining]); | |
292 | status = EXIT_FAILURE; | |
293 | continue; | |
294 | } | |
295 | } | |
296 | ||
297 | #ifdef _POSIX_MAPPED_FILES | |
298 | /* We have possibilities for reading the input file. First try | |
299 | to mmap() it since this will provide the fastest solution. */ | |
300 | if (fstat64 (fd, &st) == 0 | |
301 | && ((addr = mmap (NULL, st.st_size, PROT_READ, MAP_PRIVATE, | |
302 | fd, 0)) != MAP_FAILED)) | |
303 | { | |
304 | /* Yes, we can use mmap(). The descriptor is not needed | |
305 | anymore. */ | |
306 | if (close (fd) != 0) | |
307 | error (EXIT_FAILURE, errno, | |
308 | _("error while closing input `%s'"), | |
309 | argv[remaining]); | |
310 | ||
311 | ret = process_block (cd, addr, st.st_size, &output, | |
312 | output_file); | |
313 | ||
314 | /* We don't need the input data anymore. */ | |
315 | munmap ((void *) addr, st.st_size); | |
316 | ||
317 | if (ret != 0) | |
318 | { | |
319 | status = EXIT_FAILURE; | |
320 | ||
321 | if (ret < 0) | |
322 | /* We cannot go on with producing output since it might | |
323 | lead to problem because the last output might leave | |
324 | the output stream in an undefined state. */ | |
325 | break; | |
326 | } | |
327 | } | |
328 | else | |
329 | #endif /* _POSIX_MAPPED_FILES */ | |
330 | { | |
331 | /* Read the file in pieces. */ | |
332 | ret = process_fd (cd, fd, &output, output_file); | |
333 | ||
334 | /* Now close the file. */ | |
335 | close (fd); | |
336 | ||
337 | if (ret != 0) | |
338 | { | |
339 | /* Something went wrong. */ | |
340 | status = EXIT_FAILURE; | |
341 | ||
342 | if (ret < 0) | |
343 | /* We cannot go on with producing output since it might | |
344 | lead to problem because the last output might leave | |
345 | the output stream in an undefined state. */ | |
346 | break; | |
347 | } | |
348 | } | |
349 | } | |
350 | while (++remaining < argc); | |
351 | ||
352 | /* Close the output file now. */ | |
353 | if (output != NULL && fclose (output)) | |
354 | error (EXIT_FAILURE, errno, _("error while closing output file")); | |
355 | } | |
356 | ||
357 | return status; | |
358 | } | |
359 | ||
360 | ||
361 | /* Handle program arguments. */ | |
362 | static error_t | |
363 | parse_opt (int key, char *arg, struct argp_state *state) | |
364 | { | |
365 | switch (key) | |
366 | { | |
367 | case 'f': | |
368 | from_code = arg; | |
369 | break; | |
370 | case 't': | |
371 | to_code = arg; | |
372 | break; | |
373 | case 'o': | |
374 | output_file = arg; | |
375 | break; | |
376 | case 's': | |
377 | /* Nothing, for now at least. We are not giving out any information | |
378 | about missing character or so. */ | |
379 | break; | |
380 | case 'c': | |
381 | /* Omit invalid characters from output. */ | |
382 | omit_invalid = 1; | |
383 | break; | |
384 | case OPT_VERBOSE: | |
385 | verbose = 1; | |
386 | break; | |
387 | case OPT_LIST: | |
388 | list = 1; | |
389 | break; | |
390 | default: | |
391 | return ARGP_ERR_UNKNOWN; | |
392 | } | |
393 | return 0; | |
394 | } | |
395 | ||
396 | ||
397 | static char * | |
398 | more_help (int key, const char *text, void *input) | |
399 | { | |
400 | char *tp = NULL; | |
401 | switch (key) | |
402 | { | |
403 | case ARGP_KEY_HELP_EXTRA: | |
404 | /* We print some extra information. */ | |
405 | if (asprintf (&tp, gettext ("\ | |
406 | For bug reporting instructions, please see:\n\ | |
407 | %s.\n"), REPORT_BUGS_TO) < 0) | |
408 | return NULL; | |
409 | return tp; | |
410 | default: | |
411 | break; | |
412 | } | |
413 | return (char *) text; | |
414 | } | |
415 | ||
416 | ||
417 | /* Print the version information. */ | |
418 | static void | |
419 | print_version (FILE *stream, struct argp_state *state) | |
420 | { | |
421 | fprintf (stream, "iconv %s%s\n", PKGVERSION, VERSION); | |
422 | fprintf (stream, gettext ("\ | |
423 | Copyright (C) %s Free Software Foundation, Inc.\n\ | |
424 | This is free software; see the source for copying conditions. There is NO\n\ | |
425 | warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\ | |
426 | "), "2019"); | |
427 | fprintf (stream, gettext ("Written by %s.\n"), "Ulrich Drepper"); | |
428 | } | |
429 | ||
430 | ||
431 | static int | |
432 | write_output (const char *outbuf, const char *outptr, FILE **output, | |
433 | const char *output_file) | |
434 | { | |
435 | /* We have something to write out. */ | |
436 | int errno_save = errno; | |
437 | ||
438 | if (*output == NULL) | |
439 | { | |
440 | /* Determine output file. */ | |
441 | if (output_file != NULL && strcmp (output_file, "-") != 0) | |
442 | { | |
443 | *output = fopen (output_file, "w"); | |
444 | if (*output == NULL) | |
445 | error (EXIT_FAILURE, errno, _("cannot open output file")); | |
446 | } | |
447 | else | |
448 | *output = stdout; | |
449 | } | |
450 | ||
451 | if (fwrite (outbuf, 1, outptr - outbuf, *output) < (size_t) (outptr - outbuf) | |
452 | || ferror (*output)) | |
453 | { | |
454 | /* Error occurred while printing the result. */ | |
455 | error (0, 0, _("\ | |
456 | conversion stopped due to problem in writing the output")); | |
457 | return -1; | |
458 | } | |
459 | ||
460 | errno = errno_save; | |
461 | ||
462 | return 0; | |
463 | } | |
464 | ||
465 | ||
466 | static int | |
467 | process_block (iconv_t cd, char *addr, size_t len, FILE **output, | |
468 | const char *output_file) | |
469 | { | |
470 | #define OUTBUF_SIZE 32768 | |
471 | const char *start = addr; | |
472 | char outbuf[OUTBUF_SIZE]; | |
473 | char *outptr; | |
474 | size_t outlen; | |
475 | size_t n; | |
476 | int ret = 0; | |
477 | ||
478 | while (len > 0) | |
479 | { | |
480 | outptr = outbuf; | |
481 | outlen = OUTBUF_SIZE; | |
482 | n = iconv (cd, &addr, &len, &outptr, &outlen); | |
483 | ||
484 | if (n == (size_t) -1 && omit_invalid && errno == EILSEQ) | |
485 | { | |
486 | ret = 1; | |
487 | if (len == 0) | |
488 | n = 0; | |
489 | else | |
490 | errno = E2BIG; | |
491 | } | |
492 | ||
493 | if (outptr != outbuf) | |
494 | { | |
495 | ret = write_output (outbuf, outptr, output, output_file); | |
496 | if (ret != 0) | |
497 | break; | |
498 | } | |
499 | ||
500 | if (n != (size_t) -1) | |
501 | { | |
502 | /* All the input test is processed. For state-dependent | |
503 | character sets we have to flush the state now. */ | |
504 | outptr = outbuf; | |
505 | outlen = OUTBUF_SIZE; | |
506 | n = iconv (cd, NULL, NULL, &outptr, &outlen); | |
507 | ||
508 | if (outptr != outbuf) | |
509 | { | |
510 | ret = write_output (outbuf, outptr, output, output_file); | |
511 | if (ret != 0) | |
512 | break; | |
513 | } | |
514 | ||
515 | if (n != (size_t) -1) | |
516 | break; | |
517 | ||
518 | if (omit_invalid && errno == EILSEQ) | |
519 | { | |
520 | ret = 1; | |
521 | break; | |
522 | } | |
523 | } | |
524 | ||
525 | if (errno != E2BIG) | |
526 | { | |
527 | /* iconv() ran into a problem. */ | |
528 | switch (errno) | |
529 | { | |
530 | case EILSEQ: | |
531 | if (! omit_invalid) | |
532 | error (0, 0, _("illegal input sequence at position %ld"), | |
533 | (long int) (addr - start)); | |
534 | break; | |
535 | case EINVAL: | |
536 | error (0, 0, _("\ | |
537 | incomplete character or shift sequence at end of buffer")); | |
538 | break; | |
539 | case EBADF: | |
540 | error (0, 0, _("internal error (illegal descriptor)")); | |
541 | break; | |
542 | default: | |
543 | error (0, 0, _("unknown iconv() error %d"), errno); | |
544 | break; | |
545 | } | |
546 | ||
547 | return -1; | |
548 | } | |
549 | } | |
550 | ||
551 | return ret; | |
552 | } | |
553 | ||
554 | ||
555 | static int | |
556 | process_fd (iconv_t cd, int fd, FILE **output, const char *output_file) | |
557 | { | |
558 | /* we have a problem with reading from a desriptor since we must not | |
559 | provide the iconv() function an incomplete character or shift | |
560 | sequence at the end of the buffer. Since we have to deal with | |
561 | arbitrary encodings we must read the whole text in a buffer and | |
562 | process it in one step. */ | |
563 | static char *inbuf = NULL; | |
564 | static size_t maxlen = 0; | |
565 | char *inptr = NULL; | |
566 | size_t actlen = 0; | |
567 | ||
568 | while (actlen < maxlen) | |
569 | { | |
570 | ssize_t n = read (fd, inptr, maxlen - actlen); | |
571 | ||
572 | if (n == 0) | |
573 | /* No more text to read. */ | |
574 | break; | |
575 | ||
576 | if (n == -1) | |
577 | { | |
578 | /* Error while reading. */ | |
579 | error (0, errno, _("error while reading the input")); | |
580 | return -1; | |
581 | } | |
582 | ||
583 | inptr += n; | |
584 | actlen += n; | |
585 | } | |
586 | ||
587 | if (actlen == maxlen) | |
588 | while (1) | |
589 | { | |
590 | ssize_t n; | |
591 | char *new_inbuf; | |
592 | ||
593 | /* Increase the buffer. */ | |
594 | new_inbuf = (char *) realloc (inbuf, maxlen + 32768); | |
595 | if (new_inbuf == NULL) | |
596 | { | |
597 | error (0, errno, _("unable to allocate buffer for input")); | |
598 | return -1; | |
599 | } | |
600 | inbuf = new_inbuf; | |
601 | maxlen += 32768; | |
602 | inptr = inbuf + actlen; | |
603 | ||
604 | do | |
605 | { | |
606 | n = read (fd, inptr, maxlen - actlen); | |
607 | ||
608 | if (n == 0) | |
609 | /* No more text to read. */ | |
610 | break; | |
611 | ||
612 | if (n == -1) | |
613 | { | |
614 | /* Error while reading. */ | |
615 | error (0, errno, _("error while reading the input")); | |
616 | return -1; | |
617 | } | |
618 | ||
619 | inptr += n; | |
620 | actlen += n; | |
621 | } | |
622 | while (actlen < maxlen); | |
623 | ||
624 | if (n == 0) | |
625 | /* Break again so we leave both loops. */ | |
626 | break; | |
627 | } | |
628 | ||
629 | /* Now we have all the input in the buffer. Process it in one run. */ | |
630 | return process_block (cd, inbuf, actlen, output, output_file); | |
631 | } | |
632 | ||
633 | ||
634 | static int | |
635 | process_file (iconv_t cd, FILE *input, FILE **output, const char *output_file) | |
636 | { | |
637 | /* This should be safe since we use this function only for `stdin' and | |
638 | we haven't read anything so far. */ | |
639 | return process_fd (cd, fileno (input), output, output_file); | |
640 | } | |
641 | ||
642 | ||
643 | /* Print all known character sets/encodings. */ | |
644 | static void *printlist; | |
645 | static size_t column; | |
646 | static int not_first; | |
647 | ||
648 | static void | |
649 | insert_print_list (const void *nodep, VISIT value, int level) | |
650 | { | |
651 | if (value == leaf || value == postorder) | |
652 | { | |
653 | const struct gconv_alias *s = *(const struct gconv_alias **) nodep; | |
654 | tsearch (s->fromname, &printlist, (__compar_fn_t) strverscmp); | |
655 | } | |
656 | } | |
657 | ||
658 | static void | |
659 | do_print_human (const void *nodep, VISIT value, int level) | |
660 | { | |
661 | if (value == leaf || value == postorder) | |
662 | { | |
663 | const char *s = *(const char **) nodep; | |
664 | size_t len = strlen (s); | |
665 | size_t cnt; | |
666 | ||
667 | while (len > 0 && s[len - 1] == '/') | |
668 | --len; | |
669 | ||
670 | for (cnt = 0; cnt < len; ++cnt) | |
671 | if (isalnum (s[cnt])) | |
672 | break; | |
673 | if (cnt == len) | |
674 | return; | |
675 | ||
676 | if (not_first) | |
677 | { | |
678 | putchar (','); | |
679 | ++column; | |
680 | ||
681 | if (column > 2 && column + len > 77) | |
682 | { | |
683 | fputs ("\n ", stdout); | |
684 | column = 2; | |
685 | } | |
686 | else | |
687 | { | |
688 | putchar (' '); | |
689 | ++column; | |
690 | } | |
691 | } | |
692 | else | |
693 | not_first = 1; | |
694 | ||
695 | fwrite (s, len, 1, stdout); | |
696 | column += len; | |
697 | } | |
698 | } | |
699 | ||
700 | static void | |
701 | do_print (const void *nodep, VISIT value, int level) | |
702 | { | |
703 | if (value == leaf || value == postorder) | |
704 | { | |
705 | const char *s = *(const char **) nodep; | |
706 | ||
707 | puts (s); | |
708 | } | |
709 | } | |
710 | ||
711 | static void | |
712 | add_known_names (struct gconv_module *node) | |
713 | { | |
714 | if (node->left != NULL) | |
715 | add_known_names (node->left); | |
716 | if (node->right != NULL) | |
717 | add_known_names (node->right); | |
718 | do | |
719 | { | |
720 | if (strcmp (node->from_string, "INTERNAL") != 0) | |
721 | tsearch (node->from_string, &printlist, (__compar_fn_t) strverscmp); | |
722 | if (strcmp (node->to_string, "INTERNAL") != 0) | |
723 | tsearch (node->to_string, &printlist, (__compar_fn_t) strverscmp); | |
724 | ||
725 | node = node->same; | |
726 | } | |
727 | while (node != NULL); | |
728 | } | |
729 | ||
730 | ||
731 | static void | |
732 | insert_cache (void) | |
733 | { | |
734 | const struct gconvcache_header *header; | |
735 | const char *strtab; | |
736 | const struct hash_entry *hashtab; | |
737 | size_t cnt; | |
738 | ||
739 | header = (const struct gconvcache_header *) __gconv_get_cache (); | |
740 | strtab = (char *) header + header->string_offset; | |
741 | hashtab = (struct hash_entry *) ((char *) header + header->hash_offset); | |
742 | ||
743 | for (cnt = 0; cnt < header->hash_size; ++cnt) | |
744 | if (hashtab[cnt].string_offset != 0) | |
745 | { | |
746 | const char *str = strtab + hashtab[cnt].string_offset; | |
747 | ||
748 | if (strcmp (str, "INTERNAL") != 0) | |
749 | tsearch (str, &printlist, (__compar_fn_t) strverscmp); | |
750 | } | |
751 | } | |
752 | ||
753 | ||
754 | static void | |
755 | print_known_names (void) | |
756 | { | |
757 | iconv_t h; | |
758 | void *cache; | |
759 | ||
760 | /* We must initialize the internal databases first. */ | |
761 | h = iconv_open ("L1", "L1"); | |
762 | iconv_close (h); | |
763 | ||
764 | /* See whether we have a cache. */ | |
765 | cache = __gconv_get_cache (); | |
766 | if (cache != NULL) | |
767 | /* Yep, use only this information. */ | |
768 | insert_cache (); | |
769 | else | |
770 | { | |
771 | struct gconv_module *modules; | |
772 | ||
773 | /* No, then use the information read from the gconv-modules file. | |
774 | First add the aliases. */ | |
775 | twalk (__gconv_get_alias_db (), insert_print_list); | |
776 | ||
777 | /* Add the from- and to-names from the known modules. */ | |
778 | modules = __gconv_get_modules_db (); | |
779 | if (modules != NULL) | |
780 | add_known_names (modules); | |
781 | } | |
782 | ||
783 | bool human_readable = isatty (fileno (stdout)); | |
784 | ||
785 | if (human_readable) | |
786 | fputs (_("\ | |
787 | The following list contains all the coded character sets known. This does\n\ | |
788 | not necessarily mean that all combinations of these names can be used for\n\ | |
789 | the FROM and TO command line parameters. One coded character set can be\n\ | |
790 | listed with several different names (aliases).\n\n "), stdout); | |
791 | ||
792 | /* Now print the collected names. */ | |
793 | column = 2; | |
794 | twalk (printlist, human_readable ? do_print_human : do_print); | |
795 | ||
796 | if (human_readable && column != 0) | |
797 | puts (""); | |
798 | } |