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- /* wc - print the number of bytes, words, and lines in files
- Copyright (C) 85, 91, 95, 1996 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>
-
- #include <stdio.h>
- #include <getopt.h>
- #include <sys/types.h>
- #include "system.h"
- #include "error.h"
-
- /* Size of atomic reads. */
- #define BUFFER_SIZE (16 * 1024)
-
- int safe_read ();
-
- /* The name this program was run with. */
- char *program_name;
-
- /* Cumulative number of lines, words, and chars in all files so far. */
- static unsigned long total_lines, total_words, total_chars;
-
- /* Which counts to print. */
- static int print_lines, print_words, print_chars;
-
- /* 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'},
- {"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\
- -l, --lines print the newline counts\n\
- -w, --words print the word counts\n\
- -c, --bytes, --chars print the byte counts\n\
- --help display this help and exit\n\
- --version output version information and exit\n\
- "));
- }
- exit (status == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
- }
-
- static void
- write_counts (long unsigned int lines, long unsigned int words,
- long unsigned int chars, const char *file)
- {
- if (print_lines)
- printf ("%7lu", lines);
- if (print_words)
- {
- if (print_lines)
- putchar (' ');
- printf ("%7lu", words);
- }
- if (print_chars)
- {
- if (print_lines || print_words)
- putchar (' ');
- printf ("%7lu", chars);
- }
- if (*file)
- printf (" %s", file);
- putchar ('\n');
- }
-
- static void
- wc (int fd, const char *file)
- {
- char buf[BUFFER_SIZE + 1];
- register int bytes_read;
- register int in_word = 0;
- register unsigned long lines, words, chars;
-
- lines = words = chars = 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)
- {
- 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)
- {
- /* 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
- {
- while ((bytes_read = safe_read (fd, buf, BUFFER_SIZE)) > 0)
- {
- register char *p = buf;
-
- chars += bytes_read;
- do
- {
- switch (*p++)
- {
- case '\n':
- lines++;
- /* Fall through. */
- case '\r':
- case '\f':
- case '\t':
- case '\v':
- case ' ':
- if (in_word)
- {
- in_word = 0;
- words++;
- }
- break;
- default:
- in_word = 1;
- break;
- }
- }
- while (--bytes_read);
- }
- if (bytes_read < 0)
- {
- error (0, errno, "%s", file);
- exit_status = 1;
- }
- if (in_word)
- words++;
- }
-
- write_counts (lines, words, chars, file);
- total_lines += lines;
- total_words += words;
- total_chars += chars;
- }
-
- static void
- wc_file (const char *file)
- {
- if (!strcmp (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 = 0;
- total_lines = total_words = total_chars = 0;
-
- while ((optc = getopt_long (argc, argv, "clw", longopts, (int *) 0)) != EOF)
- switch (optc)
- {
- case 0:
- break;
-
- case 'c':
- print_chars = 1;
- break;
-
- case 'l':
- print_lines = 1;
- break;
-
- case 'w':
- print_words = 1;
- break;
-
- default:
- usage (1);
- }
-
- if (show_version)
- {
- printf ("wc - %s\n", PACKAGE_VERSION);
- exit (EXIT_SUCCESS);
- }
-
- if (show_help)
- usage (0);
-
- if (print_lines + print_words + print_chars == 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, _("total"));
- }
-
- if (have_read_stdin && close (0))
- error (EXIT_FAILURE, errno, "-");
-
- exit (exit_status == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
- }
-