summaryrefslogtreecommitdiff
path: root/src/wc.c
blob: 3e451ebc8384b8b4bcafd0ab923b09452723141d (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
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
/* wc - print the number of lines, words, and bytes in files
   Copyright (C) 85, 91, 1995-2005 Free Software Foundation, Inc.

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

   This program 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software Foundation,
   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */

/* Written by Paul Rubin, phr@ocf.berkeley.edu
   and David MacKenzie, djm@gnu.ai.mit.edu. */

#include <config.h>

#include <stdio.h>
#include <getopt.h>
#include <sys/types.h>

/* Get mbstate_t, mbrtowc(), wcwidth().  */
#if HAVE_WCHAR_H
# include <wchar.h>
#endif

/* Get iswprint(), iswspace().  */
#if HAVE_WCTYPE_H
# include <wctype.h>
#endif
#if !defined iswprint && !HAVE_ISWPRINT
# define iswprint(wc) 1
#endif
#if !defined iswspace && !HAVE_ISWSPACE
# define iswspace(wc) \
    ((wc) == to_uchar (wc) && ISSPACE (to_uchar (wc)))
#endif

/* Include this after wctype.h so that we `#undef' ISPRINT
   (from Solaris's euc.h, from widec.h, from wctype.h) before
   redefining and using it. */
#include "system.h"

#include "error.h"
#include "inttostr.h"
#include "safe-read.h"

/* Some systems, like BeOS, have multibyte encodings but lack mbstate_t.  */
#if HAVE_MBRTOWC && defined mbstate_t
# define mbrtowc(pwc, s, n, ps) (mbrtowc) (pwc, s, n, 0)
#endif

#ifndef HAVE_DECL_WCWIDTH
"this configure-time declaration test was not run"
#endif
#if !HAVE_DECL_WCWIDTH
extern int wcwidth ();
#endif

/* If wcwidth() doesn't exist, assume all printable characters have
   width 1.  */
#if !defined wcwidth && !HAVE_WCWIDTH
# define wcwidth(wc) ((wc) == 0 ? 0 : iswprint (wc) ? 1 : -1)
#endif

/* The official name of this program (e.g., no `g' prefix).  */
#define PROGRAM_NAME "wc"

#define AUTHORS "Paul Rubin", "David MacKenzie"

/* Size of atomic reads. */
#define BUFFER_SIZE (16 * 1024)

/* The name this program was run with. */
char *program_name;

/* Cumulative number of lines, words, chars and bytes in all files so far.
   max_line_length is the maximum over all files processed so far.  */
static uintmax_t total_lines;
static uintmax_t total_words;
static uintmax_t total_chars;
static uintmax_t total_bytes;
static uintmax_t max_line_length;

/* Which counts to print. */
static bool print_lines, print_words, print_chars, print_bytes;
static bool print_linelength;

/* The print width of each count.  */
static int number_width;

/* True if we have ever read the standard input. */
static bool have_read_stdin;

/* The result of calling fstat or stat on a file descriptor or file.  */
struct fstatus
{
  /* If positive, fstat or stat has not been called yet.  Otherwise,
     this is the value returned from fstat or stat.  */
  int failed;

  /* If FAILED is zero, this is the file's status.  */
  struct stat st;
};


static struct option const longopts[] =
{
  {"bytes", no_argument, NULL, 'c'},
  {"chars", no_argument, NULL, 'm'},
  {"lines", no_argument, NULL, 'l'},
  {"words", no_argument, NULL, 'w'},
  {"max-line-length", no_argument, NULL, 'L'},
  {GETOPT_HELP_OPTION_DECL},
  {GETOPT_VERSION_OPTION_DECL},
  {NULL, 0, NULL, 0}
};

void
usage (int status)
{
  if (status != EXIT_SUCCESS)
    fprintf (stderr, _("Try `%s --help' for more information.\n"),
	     program_name);
  else
    {
      printf (_("\
Usage: %s [OPTION]... [FILE]...\n\
"),
	      program_name);
      fputs (_("\
Print newline, word, and byte counts for each FILE, and a total line if\n\
more than one FILE is specified.  With no FILE, or when FILE is -,\n\
read standard input.\n\
  -c, --bytes            print the byte counts\n\
  -m, --chars            print the character counts\n\
  -l, --lines            print the newline counts\n\
"), stdout);
      fputs (_("\
  -L, --max-line-length  print the length of the longest line\n\
  -w, --words            print the word counts\n\
"), stdout);
      fputs (HELP_OPTION_DESCRIPTION, stdout);
      fputs (VERSION_OPTION_DESCRIPTION, stdout);
      printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
    }
  exit (status);
}

/* FILE is the name of the file (or NULL for standard input)
   associated with the specified counters.  */
static void
write_counts (uintmax_t lines,
	      uintmax_t words,
	      uintmax_t chars,
	      uintmax_t bytes,
	      uintmax_t linelength,
	      const char *file)
{
  static char const format_sp_int[] = " %*s";
  char const *format_int = format_sp_int + 1;
  char buf[INT_BUFSIZE_BOUND (uintmax_t)];

  if (print_lines)
    {
      printf (format_int, number_width, umaxtostr (lines, buf));
      format_int = format_sp_int;
    }
  if (print_words)
    {
      printf (format_int, number_width, umaxtostr (words, buf));
      format_int = format_sp_int;
    }
  if (print_chars)
    {
      printf (format_int, number_width, umaxtostr (chars, buf));
      format_int = format_sp_int;
    }
  if (print_bytes)
    {
      printf (format_int, number_width, umaxtostr (bytes, buf));
      format_int = format_sp_int;
    }
  if (print_linelength)
    {
      printf (format_int, number_width, umaxtostr (linelength, buf));
    }
  if (file)
    printf (" %s", file);
  putchar ('\n');
}

/* Count words.  FILE_X is the name of the file (or NULL for standard
   input) that is open on descriptor FD.  *FSTATUS is its status.
   Return true if successful.  */
static bool
wc (int fd, char const *file_x, struct fstatus *fstatus)
{
  bool ok = true;
  char buf[BUFFER_SIZE + 1];
  size_t bytes_read;
  uintmax_t lines, words, chars, bytes, linelength;
  bool count_bytes, count_chars, count_complicated;
  char const *file = file_x ? file_x : _("standard input");

  lines = words = chars = bytes = linelength = 0;

  /* If in the current locale, chars are equivalent to bytes, we prefer
     counting bytes, because that's easier.  */
#if HAVE_MBRTOWC && (MB_LEN_MAX > 1)
  if (MB_CUR_MAX > 1)
    {
      count_bytes = print_bytes;
      count_chars = print_chars;
    }
  else
#endif
    {
      count_bytes = print_bytes | print_chars;
      count_chars = false;
    }
  count_complicated = print_words | print_linelength;

  /* We need binary input, since `wc' relies on `lseek' and byte counts.  */
  SET_BINARY (fd);

  /* When counting only bytes, save some line- and word-counting
     overhead.  If FD is a `regular' Unix file, using lseek is enough
     to get its `size' in bytes.  Otherwise, read blocks of BUFFER_SIZE
     bytes at a time until EOF.  Note that the `size' (number of bytes)
     that wc reports is smaller than stats.st_size when the file is not
     positioned at its beginning.  That's why the lseek calls below are
     necessary.  For example the command
     `(dd ibs=99k skip=1 count=0; ./wc -c) < /etc/group'
     should make wc report `0' bytes.  */

  if (count_bytes & !count_chars & !print_lines & !count_complicated)
    {
      off_t current_pos, end_pos;

      if (0 < fstatus->failed)
	fstatus->failed = fstat (fd, &fstatus->st);

      if (! fstatus->failed && S_ISREG (fstatus->st.st_mode)
	  && (current_pos = lseek (fd, (off_t) 0, SEEK_CUR)) != -1
	  && (end_pos = lseek (fd, (off_t) 0, SEEK_END)) != -1)
	{
	  /* Be careful here.  The current position may actually be
	     beyond the end of the file.  As in the example above.  */
	  bytes = end_pos < current_pos ? 0 : end_pos - current_pos;
	}
      else
	{
	  while ((bytes_read = safe_read (fd, buf, BUFFER_SIZE)) > 0)
	    {
	      if (bytes_read == SAFE_READ_ERROR)
		{
		  error (0, errno, "%s", file);
		  ok = false;
		  break;
		}
	      bytes += bytes_read;
	    }
	}
    }
  else if (!count_chars & !count_complicated)
    {
      /* Use a separate loop when counting only lines or lines and bytes --
	 but not chars or words.  */
      while ((bytes_read = safe_read (fd, buf, BUFFER_SIZE)) > 0)
	{
	  char *p = buf;

	  if (bytes_read == SAFE_READ_ERROR)
	    {
	      error (0, errno, "%s", file);
	      ok = false;
	      break;
	    }

	  while ((p = memchr (p, '\n', (buf + bytes_read) - p)))
	    {
	      ++p;
	      ++lines;
	    }
	  bytes += bytes_read;
	}
    }
#if HAVE_MBRTOWC && (MB_LEN_MAX > 1)
# define SUPPORT_OLD_MBRTOWC 1
  else if (MB_CUR_MAX > 1)
    {
      bool in_word = false;
      uintmax_t linepos = 0;
      mbstate_t state;
      uintmax_t last_error_line = 0;
      int last_error_errno = 0;
# if SUPPORT_OLD_MBRTOWC
      /* Back-up the state before each multibyte character conversion and
	 move the last incomplete character of the buffer to the front
	 of the buffer.  This is needed because we don't know whether
	 the `mbrtowc' function updates the state when it returns -2, -
	 this is the ISO C 99 and glibc-2.2 behaviour - or not - amended
	 ANSI C, glibc-2.1 and Solaris 5.7 behaviour.  We don't have an
	 autoconf test for this, yet.  */
      size_t prev = 0; /* number of bytes carried over from previous round */
# else
      const size_t prev = 0;
# endif

      memset (&state, 0, sizeof (mbstate_t));
      while ((bytes_read = safe_read (fd, buf + prev, BUFFER_SIZE - prev)) > 0)
	{
	  const char *p;
# if SUPPORT_OLD_MBRTOWC
	  mbstate_t backup_state;
# endif
	  if (bytes_read == SAFE_READ_ERROR)
	    {
	      error (0, errno, "%s", file);
	      ok = false;
	      break;
	    }

	  bytes += bytes_read;
	  p = buf;
	  bytes_read += prev;
	  do
	    {
	      wchar_t wide_char;
	      size_t n;

# if SUPPORT_OLD_MBRTOWC
	      backup_state = state;
# endif
	      n = mbrtowc (&wide_char, p, bytes_read, &state);
	      if (n == (size_t) -2)
		{
# if SUPPORT_OLD_MBRTOWC
		  state = backup_state;
# endif
		  break;
		}
	      if (n == (size_t) -1)
		{
		  /* Signal repeated errors only once per line.  */
		  if (!(lines + 1 == last_error_line
			&& errno == last_error_errno))
		    {
		      char line_number_buf[INT_BUFSIZE_BOUND (uintmax_t)];
		      last_error_line = lines + 1;
		      last_error_errno = errno;
		      error (0, errno, "%s:%s", file,
			     umaxtostr (last_error_line, line_number_buf));
		      ok = false;
		    }
		  p++;
		  bytes_read--;
		}
	      else
		{
		  if (n == 0)
		    {
		      wide_char = 0;
		      n = 1;
		    }
		  p += n;
		  bytes_read -= n;
		  chars++;
		  switch (wide_char)
		    {
		    case '\n':
		      lines++;
		      /* Fall through. */
		    case '\r':
		    case '\f':
		      if (linepos > linelength)
			linelength = linepos;
		      linepos = 0;
		      goto mb_word_separator;
		    case '\t':
		      linepos += 8 - (linepos % 8);
		      goto mb_word_separator;
		    case ' ':
		      linepos++;
		      /* Fall through. */
		    case '\v':
		    mb_word_separator:
		      words += in_word;
		      in_word = false;
		      break;
		    default:
		      if (iswprint (wide_char))
			{
			  int width = wcwidth (wide_char);
			  if (width > 0)
			    linepos += width;
			  if (iswspace (wide_char))
			    goto mb_word_separator;
			  in_word = true;
			}
		      break;
		    }
		}
	    }
	  while (bytes_read > 0);

# if SUPPORT_OLD_MBRTOWC
	  if (bytes_read > 0)
	    {
	      if (bytes_read == BUFFER_SIZE)
		{
		  /* Encountered a very long redundant shift sequence.  */
		  p++;
		  bytes_read--;
		}
	      memmove (buf, p, bytes_read);
	    }
	  prev = bytes_read;
# endif
	}
      if (linepos > linelength)
	linelength = linepos;
      words += in_word;
    }
#endif
  else
    {
      bool in_word = false;
      uintmax_t linepos = 0;

      while ((bytes_read = safe_read (fd, buf, BUFFER_SIZE)) > 0)
	{
	  const char *p = buf;
	  if (bytes_read == SAFE_READ_ERROR)
	    {
	      error (0, errno, "%s", file);
	      ok = false;
	      break;
	    }

	  bytes += bytes_read;
	  do
	    {
	      switch (*p++)
		{
		case '\n':
		  lines++;
		  /* Fall through. */
		case '\r':
		case '\f':
		  if (linepos > linelength)
		    linelength = linepos;
		  linepos = 0;
		  goto word_separator;
		case '\t':
		  linepos += 8 - (linepos % 8);
		  goto word_separator;
		case ' ':
		  linepos++;
		  /* Fall through. */
		case '\v':
		word_separator:
		  words += in_word;
		  in_word = false;
		  break;
		default:
		  if (ISPRINT (to_uchar (p[-1])))
		    {
		      linepos++;
		      if (ISSPACE (to_uchar (p[-1])))
			goto word_separator;
		      in_word = true;
		    }
		  break;
		}
	    }
	  while (--bytes_read);
	}
      if (linepos > linelength)
	linelength = linepos;
      words += in_word;
    }

  if (count_chars < print_chars)
    chars = bytes;

  write_counts (lines, words, chars, bytes, linelength, file_x);
  total_lines += lines;
  total_words += words;
  total_chars += chars;
  total_bytes += bytes;
  if (linelength > max_line_length)
    max_line_length = linelength;

  return ok;
}

static bool
wc_file (char const *file, struct fstatus *fstatus)
{
  if (STREQ (file, "-"))
    {
      have_read_stdin = true;
      return wc (STDIN_FILENO, file, fstatus);
    }
  else
    {
      int fd = open (file, O_RDONLY);
      if (fd == -1)
	{
	  error (0, errno, "%s", file);
	  return false;
	}
      else
	{
	  bool ok = wc (fd, file, fstatus);
	  if (close (fd) != 0)
	    {
	      error (0, errno, "%s", file);
	      return false;
	    }
	  return ok;
	}
    }
}

/* Return the file status for the NFILES files addressed by FILE.
   Optimize the case where only one number is printed, for just one
   file; in that case we can use a print width of 1, so we don't need
   to stat the file.  */

static struct fstatus *
get_input_fstatus (int nfiles, char * const *file)
{
  struct fstatus *fstatus = xnmalloc (nfiles, sizeof *fstatus);

  if (nfiles == 1
      && ((print_lines + print_words + print_chars
	   + print_bytes + print_linelength)
	  == 1))
    fstatus[0].failed = 1;
  else
    {
      int i;

      for (i = 0; i < nfiles; i++)
	fstatus[i].failed = (! file[i] || STREQ (file[i], "-")
			     ? fstat (STDIN_FILENO, &fstatus[i].st)
			     : stat (file[i], &fstatus[i].st));
    }

  return fstatus;
}

/* Return a print width suitable for the NFILES files whose status is
   recorded in FSTATUS.  Optimize the same special case that
   get_input_fstatus optimizes.  */

static int
compute_number_width (int nfiles, struct fstatus const *fstatus)
{
  int width = 1;

  if (fstatus[0].failed <= 0)
    {
      int minimum_width = 1;
      uintmax_t regular_total = 0;
      int i;

      for (i = 0; i < nfiles; i++)
	if (! fstatus[i].failed)
	  {
	    if (S_ISREG (fstatus[i].st.st_mode))
	      regular_total += fstatus[i].st.st_size;
	    else
	      minimum_width = 7;
	  }

      for (; 10 <= regular_total; regular_total /= 10)
	width++;
      if (width < minimum_width)
	width = minimum_width;
    }

  return width;
}


int
main (int argc, char **argv)
{
  bool ok;
  int optc;
  int nfiles;
  struct fstatus *fstatus;

  initialize_main (&argc, &argv);
  program_name = argv[0];
  setlocale (LC_ALL, "");
  bindtextdomain (PACKAGE, LOCALEDIR);
  textdomain (PACKAGE);

  atexit (close_stdout);

  print_lines = print_words = print_chars = print_bytes = false;
  print_linelength = false;
  total_lines = total_words = total_chars = total_bytes = max_line_length = 0;

  while ((optc = getopt_long (argc, argv, "clLmw", longopts, NULL)) != -1)
    switch (optc)
      {
      case 'c':
	print_bytes = true;
	break;

      case 'm':
	print_chars = true;
	break;

      case 'l':
	print_lines = true;
	break;

      case 'w':
	print_words = true;
	break;

      case 'L':
	print_linelength = true;
	break;

      case_GETOPT_HELP_CHAR;

      case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);

      default:
	usage (EXIT_FAILURE);
      }

  if (! (print_lines | print_words | print_chars | print_bytes
	 | print_linelength))
    print_lines = print_words = print_bytes = true;

  nfiles = argc - optind;
  nfiles += (nfiles == 0);

  fstatus = get_input_fstatus (nfiles, argv + optind);
  number_width = compute_number_width (nfiles, fstatus);

  if (! argv[optind])
    {
      have_read_stdin = true;
      ok = wc (STDIN_FILENO, NULL, &fstatus[0]);
    }
  else
    {
      int i;

      ok = true;
      for (i = 0; i < nfiles; i++)
	ok &= wc_file (argv[optind + i], &fstatus[i]);

      if (nfiles > 1)
	write_counts (total_lines, total_words, total_chars, total_bytes,
		      max_line_length, _("total"));
    }

  free (fstatus);

  if (have_read_stdin && close (STDIN_FILENO) != 0)
    error (EXIT_FAILURE, errno, "-");

  exit (ok ? EXIT_SUCCESS : EXIT_FAILURE);
}