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- /* wc - print the number of bytes, words, and lines in files
- Copyright (C) 1985, 1991 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., 675 Mass Ave, Cambridge, MA 02139, 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 "version.h"
-
- /* Size of atomic reads. */
- #define BUFFER_SIZE (16 * 1024)
-
- void error ();
- int safe_read ();
-
- static void wc ();
- static void wc_file ();
- static void write_counts ();
-
- /* 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 non-zero, display usage information and exit. */
- static int show_help;
-
- /* If non-zero, 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 (status)
- 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 ("\
- \n\
- -c, --bytes, --chars print the byte counts\n\
- -l, --lines print the newline counts\n\
- -w, --words print the word counts\n\
- --help display this help and exit\n\
- --version output version information and exit\n\
- \n\
- Print lines, words and bytes in that order. If none of -clw, select\n\
- them all. With no FILE, or when FILE is -, read standard input.\n\
- ");
- }
- exit (status);
- }
-
- main (argc, argv)
- int argc;
- char **argv;
- {
- int optc;
- int nfiles;
-
- program_name = argv[0];
- 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", version_string);
- exit (0);
- }
-
- 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 (1, errno, "-");
-
- exit (exit_status);
- }
-
- static void
- wc_file (file)
- 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;
- }
- }
- }
-
- char buf[BUFFER_SIZE]; /* Move buffer off stack; David Gay */
-
- static void
- wc (fd, file)
- int fd;
- char *file;
- {
- register int bytes_read;
- register int in_word = 0;
- register unsigned long lines, words, chars;
- struct stat stats;
-
- lines = words = chars = 0;
-
- /* When counting only bytes, save some line- and word-counting
- overhead. If FD is a `regular' Unix file, using fstat is enough
- to get its size in bytes. Otherwise, read blocks of BUFFER_SIZE
- bytes at a time until EOF. */
- if (print_chars && !print_words && !print_lines)
- {
- if (fstat (fd, &stats) == 0 && S_ISREG (stats.st_mode))
- {
- chars = stats.st_size;
- }
- 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
- {
- 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
- write_counts (lines, words, chars, file)
- unsigned long lines, words, chars;
- 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');
- }
-