aboutsummaryrefslogtreecommitdiff
path: root/iconv/iconv_prog.c
blob: 1470721893feef74ac86ed66c2e0ddf86220568b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
/* Convert text in given files from the specified from-set to the to-set.
   Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <argp.h>
#include <ctype.h>
#include <errno.h>
#include <error.h>
#include <fcntl.h>
#include <iconv.h>
#include <locale.h>
#include <search.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <libintl.h>
#ifdef _POSIX_MAPPED_FILES
# include <sys/mman.h>
#endif
#include <gconv_int.h>

/* Get libc version number.  */
#include "../version.h"

#define PACKAGE _libc_intl_domainname


/* Name and version of program.  */
static void print_version (FILE *stream, struct argp_state *state);
void (*argp_program_version_hook) (FILE *, struct argp_state *) = print_version;

#define OPT_VERBOSE	1000
#define OPT_LIST	'l'

/* Definitions of arguments for argp functions.  */
static const struct argp_option options[] =
{
  { NULL, 0, NULL, 0, N_("Input/Output format specification:") },
  { "from-code", 'f', "NAME", 0, N_("encoding of original text") },
  { "to-code", 't', "NAME", 0, N_("encoding for output") },
  { NULL, 0, NULL, 0, N_("Information:") },
  { "list", 'l', NULL, 0, N_("list all known coded character sets") },
  { NULL, 0, NULL, 0, N_("Output control:") },
  { NULL, 'c', NULL, 0, N_("omit invalid characters from output") },
  { "output", 'o', "FILE", 0, N_("output file") },
  { "silent", 's', NULL, 0, N_("suppress warnings") },
  { "verbose", OPT_VERBOSE, NULL, 0, N_("print progress information") },
  { NULL, 0, NULL, 0, NULL }
};

/* Short description of program.  */
static const char doc[] = N_("\
Convert encoding of given files from one encoding to another.");

/* Strings for arguments in help texts.  */
static const char args_doc[] = N_("[FILE...]");

/* Prototype for option handler.  */
static error_t parse_opt (int key, char *arg, struct argp_state *state);

/* Function to print some extra text in the help message.  */
static char *more_help (int key, const char *text, void *input);

/* Data structure to communicate with argp functions.  */
static struct argp argp =
{
  options, parse_opt, args_doc, doc, NULL, more_help
};

/* Code sets to convert from and to respectively.  */
static const char *from_code;
static const char *to_code;

/* File to write output to.  If NULL write to stdout.  */
static const char *output_file;

/* Nonzero if verbose ouput is wanted.  */
static int verbose;

/* Nonzero if list of all coded character sets is wanted.  */
static int list;

/* If nonzero omit invalid character from output.  */
static int omit_invalid;

/* Prototypes for the functions doing the actual work.  */
static int process_block (iconv_t cd, char *addr, size_t len, FILE *output);
static int process_fd (iconv_t cd, int fd, FILE *output);
static int process_file (iconv_t cd, FILE *input, FILE *output);
static void print_known_names (void) internal_function;


int
main (int argc, char *argv[])
{
  int status = EXIT_SUCCESS;
  int remaining;
  FILE *output;
  iconv_t cd;
  const char *orig_to_code;

  /* Set locale via LC_ALL.  */
  setlocale (LC_ALL, "");

  /* Set the text message domain.  */
  textdomain (_libc_intl_domainname);

  /* Parse and process arguments.  */
  argp_parse (&argp, argc, argv, 0, &remaining, NULL);

  /* List all coded character sets if wanted.  */
  if (list)
    {
      print_known_names ();
      exit (EXIT_SUCCESS);
    }

  /* If either the from- or to-code is not specified this is an error
     since we do not know what to do.  */
  if (from_code == NULL && to_code == NULL)
    error (EXIT_FAILURE, 0,
	   _("neither original nor target encoding specified"));
  if (from_code == NULL)
    error (EXIT_FAILURE, 0, _("original encoding not specified using `-f'"));
  if (to_code == NULL)
    error (EXIT_FAILURE, 0, _("target encoding not specified using `-t'"));

  /* If we have to ignore errors make sure we use the appropriate name for
     the to-character-set.  */
  orig_to_code = to_code;
  if (omit_invalid)
    {
      const char *errhand = strchrnul (to_code, '/');
      int nslash = 2;
      char *newp;
      char *cp;

      if (*errhand == '/')
	{
	  --nslash;
	  errhand = strchrnul (errhand, '/');

	  if (*errhand == '/')
	    {
	      --nslash;
	      ++errhand;
	    }
	}

      newp = (char *) alloca (errhand - to_code + nslash + 6 + 1);
      cp = mempcpy (newp, to_code, errhand - to_code);
      while (nslash-- > 0)
	*cp++ = '/';
      memcpy (cp, "NEEDED", sizeof ("NEEDED"));

      to_code = newp;
    }

  /* Let's see whether we have these coded character sets.  */
  cd = iconv_open (to_code, from_code);
  if (cd == (iconv_t) -1)
    {
      if (errno == EINVAL)
	error (EXIT_FAILURE, 0,
	       _("conversion from `%s' to `%s' not supported"),
	       from_code, orig_to_code);
      else
	error (EXIT_FAILURE, errno,
	       _("failed to start conversion processing"));
    }

  /* Determine output file.  */
  if (output_file != NULL)
    {
      output = fopen (output_file, "w");
      if (output == NULL)
	error (EXIT_FAILURE, errno, _("cannot open output file"));
    }
  else
    output = stdout;

  /* Now process the remaining files.  Write them to stdout or the file
     specified with the `-o' parameter.  If we have no file given as
     the parameter process all from stdin.  */
  if (remaining == argc)
    {
      if (process_file (cd, stdin, output) != 0)
	status = EXIT_FAILURE;
    }
  else
    do
      {
	struct stat st;
	char *addr;
	int fd;


	if (verbose)
	  printf ("%s:\n", argv[remaining]);
	if (strcmp (argv[remaining], "-") == 0)
	  fd = 0;
	else
	  {
	    fd = open (argv[remaining], O_RDONLY);

	    if (fd == -1)
	      {
		error (0, errno, _("cannot open input file `%s'"),
		       argv[remaining]);
		status = EXIT_FAILURE;
		continue;
	      }
	  }

#ifdef _POSIX_MAPPED_FILES
	/* We have possibilities for reading the input file.  First try
	   to mmap() it since this will provide the fastest solution.  */
	if (fstat (fd, &st) == 0
	    && ((addr = mmap (NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0))
		!= MAP_FAILED))
	  {
	    /* Yes, we can use mmap().  The descriptor is not needed
               anymore.  */
	    if (close (fd) != 0)
	      error (EXIT_FAILURE, errno, _("error while closing input `%s'"),
		     argv[remaining]);

	    if (process_block (cd, addr, st.st_size, output) < 0)
	      {
		/* Something went wrong.  */
		status = EXIT_FAILURE;

		/* We don't need the input data anymore.  */
		munmap ((void *) addr, st.st_size);

		/* We cannot go on with producing output since it might
		   lead to problem because the last output might leave
		   the output stream in an undefined state.  */
		break;
	      }

	    /* We don't need the input data anymore.  */
	    munmap ((void *) addr, st.st_size);
	  }
	else
#endif	/* _POSIX_MAPPED_FILES */
	  {
	    /* Read the file in pieces.  */
	    if (process_fd (cd, fd, output) != 0)
	      {
		/* Something went wrong.  */
		status = EXIT_FAILURE;

		/* We don't need the input file anymore.  */
		close (fd);

		/* We cannot go on with producing output since it might
		   lead to problem because the last output might leave
		   the output stream in an undefined state.  */
		break;
	      }

	    /* Now close the file.  */
	    close (fd);
	  }
      }
    while (++remaining < argc);

  /* Close the output file now.  */
  if (fclose (output))
    error (EXIT_FAILURE, errno, _("error while closing output file"));

  return status;
}


/* Handle program arguments.  */
static error_t
parse_opt (int key, char *arg, struct argp_state *state)
{
  switch (key)
    {
    case 'f':
      from_code = arg;
      break;
    case 't':
      to_code = arg;
      break;
    case 'o':
      output_file = arg;
      break;
    case 's':
      /* Nothing, for now at least.  We are not giving out any information
	 about missing character or so.  */
      break;
    case 'c':
      /* Omit invalid characters from output.  */
      omit_invalid = 1;
      break;
    case OPT_VERBOSE:
      verbose = 1;
      break;
    case OPT_LIST:
      list = 1;
      break;
    default:
      return ARGP_ERR_UNKNOWN;
    }
  return 0;
}


static char *
more_help (int key, const char *text, void *input)
{
  switch (key)
    {
    case ARGP_KEY_HELP_EXTRA:
      /* We print some extra information.  */
      return strdup (gettext ("\
Report bugs using the `glibcbug' script to <bugs@gnu.org>.\n"));
    default:
      break;
    }
  return (char *) text;
}


/* Print the version information.  */
static void
print_version (FILE *stream, struct argp_state *state)
{
  fprintf (stream, "iconv (GNU %s) %s\n", PACKAGE, VERSION);
  fprintf (stream, gettext ("\
Copyright (C) %s Free Software Foundation, Inc.\n\
This is free software; see the source for copying conditions.  There is NO\n\
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\
"), "2000");
  fprintf (stream, gettext ("Written by %s.\n"), "Ulrich Drepper");
}


static int
process_block (iconv_t cd, char *addr, size_t len, FILE *output)
{
#define OUTBUF_SIZE	32768
  const char *start = addr;
  char outbuf[OUTBUF_SIZE];
  char *outptr;
  size_t outlen;
  size_t n;

  while (len > 0)
    {
      outptr = outbuf;
      outlen = OUTBUF_SIZE;
      n = iconv (cd, &addr, &len, &outptr, &outlen);

      if (outptr != outbuf)
	{
	  /* We have something to write out.  */
	  int errno_save = errno;

	  if (fwrite (outbuf, 1, outptr - outbuf, output) < outptr - outbuf
	      || ferror (output))
	    {
	      /* Error occurred while printing the result.  */
	      error (0, 0, _("\
conversion stopped due to problem in writing the output"));
	      return -1;
	    }

	  errno = errno_save;
	}

      if (n != (size_t) -1)
	{
	  /* All the input test is processed.  For state-dependent
             character sets we have to flush the state now.  */
	  outptr = outbuf;
	  outlen = OUTBUF_SIZE;
	  n = iconv (cd, NULL, NULL, &outptr, &outlen);

	  if (outptr != outbuf)
	    {
	      /* We have something to write out.  */
	      int errno_save = errno;

	      if (fwrite (outbuf, 1, outptr - outbuf, output) < outptr - outbuf
		  || ferror (output))
		{
		  /* Error occurred while printing the result.  */
		  error (0, 0, _("\
conversion stopped due to problem in writing the output"));
		  return -1;
		}

	      errno = errno_save;
	    }

	  break;
	}

      if (errno != E2BIG)
	{
	  /* iconv() ran into a problem.  */
	  switch (errno)
	    {
	    case EILSEQ:
	      error (0, 0, _("illegal input sequence at position %ld"),
		     (long) (addr - start));
	      break;
	    case EINVAL:
	      error (0, 0, _("\
incomplete character or shift sequence at end of buffer"));
	      break;
	    case EBADF:
	      error (0, 0, _("internal error (illegal descriptor)"));
	      break;
	    default:
	      error (0, 0, _("unknown iconv() error %d"), errno);
	      break;
	    }

	  return -1;
	}
    }

  return 0;
}


static int
process_fd (iconv_t cd, int fd, FILE *output)
{
  /* we have a problem with reading from a desriptor since we must not
     provide the iconv() function an incomplete character or shift
     sequence at the end of the buffer.  Since we have to deal with
     arbitrary encodings we must read the whole text in a buffer and
     process it in one step.  */
  static char *inbuf = NULL;
  static size_t maxlen = 0;
  char *inptr = NULL;
  size_t actlen = 0;

  while (actlen < maxlen)
    {
      size_t n = read (fd, inptr, maxlen - actlen);

      if (n == 0)
	/* No more text to read.  */
	break;

      if (n == -1)
	{
	  /* Error while reading.  */
	  error (0, errno, _("error while reading the input"));
	  return -1;
	}

      inptr += n;
      actlen += n;
    }

  if (actlen == maxlen)
    while (1)
      {
	size_t n;

	/* Increase the buffer.  */
	maxlen += 32768;
	inbuf = realloc (inbuf, maxlen);
	if (inbuf == NULL)
	  error (0, errno, _("unable to allocate buffer for input"));
	inptr = inbuf + actlen;

	do
	  {
	    n = read (fd, inptr, maxlen - actlen);

	    if (n == 0)
	      /* No more text to read.  */
	      break;

	    if (n == -1)
	      {
		/* Error while reading.  */
		error (0, errno, _("error while reading the input"));
		return -1;
	      }

	    inptr += n;
	    actlen += n;
	  }
	while (actlen < maxlen);

	if (n == 0)
	  /* Break again so we leave both loops.  */
	  break;
      }

  /* Now we have all the input in the buffer.  Process it in one run.  */
  return process_block (cd, inbuf, actlen, output);
}


static int
process_file (iconv_t cd, FILE *input, FILE *output)
{
  /* This should be safe since we use this function only for `stdin' and
     we haven't read anything so far.  */
  return process_fd (cd, fileno (input), output);
}


/* Print all known character sets/encodings.  */
static void *printlist;
static size_t column;
static int not_first;

static void
insert_print_list (const void *nodep, VISIT value, int level)
{
  if (value == leaf || value == postorder)
    {
      const struct gconv_alias *s = *(const struct gconv_alias **) nodep;
      tsearch (s->fromname, &printlist, (__compar_fn_t) strverscmp);
    }
}

static void
do_print  (const void *nodep, VISIT value, int level)
{
  if (value == leaf || value == postorder)
    {
      const char *s = *(const char **) nodep;
      size_t len = strlen (s);
      size_t cnt;

      while (len > 0 && s[len - 1] == '/')
	--len;

      for (cnt = 0; cnt < len; ++cnt)
	if (isalnum (s[cnt]))
	  break;
      if (cnt == len)
	return;

      if (not_first)
	{
	  putchar (',');
	  ++column;

	  if (column > 2 && column + len > 77)
	    {
	      fputs ("\n  ", stdout);
	      column = 2;
	    }
	  else
	    {
	      putchar (' ');
	      ++column;
	    }
	}
      else
	not_first = 1;

      fwrite (s, len, 1, stdout);
      column += len;
    }
}

static void
internal_function
add_known_names (struct gconv_module *node)
{
  if (node->left != NULL)
    add_known_names (node->left);
  if (node->right != NULL)
    add_known_names (node->right);
  do
    {
      if (strcmp (node->from_string, "INTERNAL"))
	tsearch (node->from_string, &printlist,
		 (__compar_fn_t) strverscmp);
      if (strcmp (node->to_string, "INTERNAL"))
	tsearch (node->to_string, &printlist, (__compar_fn_t) strverscmp);

      node = node->same;
    }
  while (node != NULL);
}

static void
internal_function
print_known_names (void)
{
  iconv_t h;

  /* We must initialize the internal databases first.  */
  h = iconv_open ("L1", "L1");
  iconv_close (h);

  /* First add the aliases.  */
  twalk (__gconv_alias_db, insert_print_list);

  /* Add the from- and to-names from the known modules.  */
  add_known_names (__gconv_modules_db);

  fputs (_("\
The following list contain all the coded character sets known.  This does\n\
not necessarily mean that all combinations of these names can be used for\n\
the FROM and TO command line parameters.  One coded character set can be\n\
listed with several different names (aliases).\n\n  "), stdout);

  /* Now print the collected names.  */
  column = 2;
  twalk (printlist, do_print);

  if (column != 0)
    puts ("");
}