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/* wc - print the number of bytes, words, and lines in files
Copyright (C) 85, 91, 1995-1999 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 "long-options.h"
#include "safe-read.h"
/* The official name of this program (e.g., no `g' prefix). */
#define PROGRAM_NAME "wc"
#define AUTHORS "Paul Rubin and 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, 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;
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'},
{NULL, 0, NULL, 0}
};
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 <bug-textutils@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));
space = " ";
}
if (print_words)
{
printf ("%s%7s", space, human_readable (words, buf, 1, 1));
space = " ";
}
if (print_chars)
{
printf ("%s%7s", space, human_readable (chars, buf, 1, 1));
space = " ";
}
if (print_linelength)
{
printf ("%s%7s", space, human_readable (linelength, buf, 1, 1));
}
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;
/* 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 (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);
parse_long_options (argc, argv, PROGRAM_NAME, GNU_PACKAGE, VERSION,
"Paul Rubin and David MacKenzie", usage);
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 (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);
}
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