summaryrefslogtreecommitdiff
path: root/src/wc.c
blob: 15a38917a306364d05ff4e1361ca6db985ca4dbe (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
/* wc - print the number of bytes, words, and lines in files
   Copyright (C) 85, 91, 95, 96, 1997, 1998 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

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

#include <stdio.h>
#include <getopt.h>
#include <sys/types.h>
#include "system.h"
#include "error.h"
#include "human.h"
#include "safe-read.h"

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

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

/* Cumulative number of lines, words, and chars 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 max_line_length;

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

/* Nonzero if we have ever read the standard input. */
static int have_read_stdin;

/* The error code to return to the system. */
static int exit_status;

/* If nonzero, display usage information and exit.  */
static int show_help;

/* If nonzero, print the version on standard output then exits.  */
static int show_version;

static struct option const longopts[] =
{
  {"bytes", no_argument, NULL, 'c'},
  {"chars", no_argument, NULL, 'c'},
  {"lines", no_argument, NULL, 'l'},
  {"words", no_argument, NULL, 'w'},
  {"max-line-length", no_argument, NULL, 'L'},
  {"help", no_argument, &show_help, 1},
  {"version", no_argument, &show_version, 1},
  {NULL, 0, NULL, 0}
};

static void
usage (int status)
{
  if (status != 0)
    fprintf (stderr, _("Try `%s --help' for more information.\n"),
	     program_name);
  else
    {
      printf (_("\
Usage: %s [OPTION]... [FILE]...\n\
"),
	      program_name);
      printf (_("\
Print line, 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, --chars   print the byte counts\n\
  -l, --lines            print the newline counts\n\
  -L, --max-line-length  print the length of the longest line\n\
  -w, --words            print the word counts\n\
      --help             display this help and exit\n\
      --version          output version information and exit\n\
"));
      puts (_("\nReport bugs to <textutils-bugs@gnu.org>."));
    }
  exit (status == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
}

static void
write_counts (uintmax_t lines,
	      uintmax_t words,
	      uintmax_t chars,
	      uintmax_t linelength,
	      const char *file)
{
  char buf[LONGEST_HUMAN_READABLE + 1];
  char const *space = "";

  if (print_lines)
    {
      printf ("%7s", human_readable (lines, buf, 1, 1, 0));
      space = " ";
    }
  if (print_words)
    {
      printf ("%s%7s", space, human_readable (words, buf, 1, 1, 0));
      space = " ";
    }
  if (print_chars)
    {
      printf ("%s%7s", space, human_readable (chars, buf, 1, 1, 0));
      space = " ";
    }
  if (print_linelength)
    {
      printf ("%s%7s", space, human_readable (linelength, buf, 1, 1, 0));
    }
  if (*file)
    printf (" %s", file);
  putchar ('\n');
}

static void
wc (int fd, const char *file)
{
  char buf[BUFFER_SIZE + 1];
  ssize_t bytes_read;
  int in_word = 0;
  uintmax_t lines, words, chars, linelength;

  lines = words = chars = linelength = 0;

  /* 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 (print_chars && !print_words && !print_lines && !print_linelength)
    {
      off_t current_pos, end_pos;
      struct stat stats;

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

	  while ((p = memchr (p, '\n', (buf + bytes_read) - p)))
	    {
	      ++p;
	      ++lines;
	    }
	  chars += bytes_read;
	}
      if (bytes_read < 0)
	{
	  error (0, errno, "%s", file);
	  exit_status = 1;
	}
    }
  else
    {
      uintmax_t linepos = 0;

      while ((bytes_read = safe_read (fd, buf, BUFFER_SIZE)) > 0)
	{
	  const char *p = buf;

	  chars += 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:
		  if (in_word)
		    {
		      in_word = 0;
		      words++;
		    }
		  break;
		default:
		  linepos++;
		  in_word = 1;
		  break;
		}
	    }
	  while (--bytes_read);
	}
      if (bytes_read < 0)
	{
	  error (0, errno, "%s", file);
	  exit_status = 1;
	}
      if (linepos > linelength)
	linelength = linepos;
      if (in_word)
	words++;
    }

  write_counts (lines, words, chars, linelength, file);
  total_lines += lines;
  total_words += words;
  total_chars += chars;
  if (linelength > max_line_length)
    max_line_length = linelength;
}

static void
wc_file (const char *file)
{
  if (STREQ (file, "-"))
    {
      have_read_stdin = 1;
      wc (0, file);
    }
  else
    {
      int fd = open (file, O_RDONLY);
      if (fd == -1)
	{
	  error (0, errno, "%s", file);
	  exit_status = 1;
	  return;
	}
      wc (fd, file);
      if (close (fd))
	{
	  error (0, errno, "%s", file);
	  exit_status = 1;
	}
    }
}

int
main (int argc, char **argv)
{
  int optc;
  int nfiles;

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

  exit_status = 0;
  print_lines = print_words = print_chars = print_linelength = 0;
  total_lines = total_words = total_chars = max_line_length = 0;

  while ((optc = getopt_long (argc, argv, "clLw", longopts, NULL)) != -1)
    switch (optc)
      {
      case 0:
	break;

      case 'c':
	print_chars = 1;
	break;

      case 'l':
	print_lines = 1;
	break;

      case 'w':
	print_words = 1;
	break;

      case 'L':
	print_linelength = 1;
	break;

      default:
	usage (1);
      }

  if (show_version)
    {
      printf ("wc (%s) %s\n", GNU_PACKAGE, VERSION);
      exit (EXIT_SUCCESS);
    }

  if (show_help)
    usage (0);

  if (print_lines + print_words + print_chars + print_linelength == 0)
    print_lines = print_words = print_chars = 1;

  nfiles = argc - optind;

  if (nfiles == 0)
    {
      have_read_stdin = 1;
      wc (0, "");
    }
  else
    {
      for (; optind < argc; ++optind)
	wc_file (argv[optind]);

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

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

  exit (exit_status == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
}