OpenBSD-4.6/usr.bin/wc/wc.c
/* $OpenBSD: wc.c,v 1.12 2008/06/19 18:29:06 otto Exp $ */
/*
* Copyright (c) 1980, 1987, 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1980, 1987, 1991, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)wc.c 8.2 (Berkeley) 5/2/95";
#else
static char rcsid[] = "$OpenBSD: wc.c,v 1.12 2008/06/19 18:29:06 otto Exp $";
#endif
#endif /* not lint */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <locale.h>
#include <ctype.h>
#include <err.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <unistd.h>
#include <util.h>
int64_t tlinect, twordct, tcharct;
int doline, doword, dochar, humanchar;
int rval;
extern char *__progname;
void print_counts(int64_t, int64_t, int64_t, char *);
void cnt(char *);
int
main(int argc, char *argv[])
{
int ch;
setlocale(LC_ALL, "");
while ((ch = getopt(argc, argv, "lwchm")) != -1)
switch((char)ch) {
case 'l':
doline = 1;
break;
case 'w':
doword = 1;
break;
case 'c':
case 'm':
dochar = 1;
break;
case 'h':
humanchar = 1;
break;
case '?':
default:
(void)fprintf(stderr,
"usage: %s [-c | -m] [-hlw] [file ...]\n",
__progname);
exit(1);
}
argv += optind;
argc -= optind;
/*
* wc is unusual in that its flags are on by default, so,
* if you don't get any arguments, you have to turn them
* all on.
*/
if (!doline && !doword && !dochar)
doline = doword = dochar = 1;
if (!*argv) {
cnt((char *)NULL);
} else {
int dototal = (argc > 1);
do {
cnt(*argv);
} while(*++argv);
if (dototal)
print_counts(tlinect, twordct, tcharct, "total");
}
exit(rval);
}
void
cnt(char *file)
{
u_char *C;
short gotsp;
int len;
int64_t linect, wordct, charct;
struct stat sbuf;
int fd;
u_char buf[MAXBSIZE];
linect = wordct = charct = 0;
if (file) {
if ((fd = open(file, O_RDONLY, 0)) < 0) {
warn("%s", file);
rval = 1;
return;
}
} else {
fd = STDIN_FILENO;
}
if (!doword) {
/*
* Line counting is split out because it's a lot
* faster to get lines than to get words, since
* the word count requires some logic.
*/
if (doline) {
while ((len = read(fd, buf, MAXBSIZE)) > 0) {
charct += len;
for (C = buf; len--; ++C)
if (*C == '\n')
++linect;
}
if (len == -1) {
warn("%s", file);
rval = 1;
}
}
/*
* If all we need is the number of characters and
* it's a directory or a regular or linked file, just
* stat the puppy. We avoid testing for it not being
* a special device in case someone adds a new type
* of inode.
*/
else if (dochar) {
mode_t ifmt;
if (fstat(fd, &sbuf)) {
warn("%s", file);
rval = 1;
} else {
ifmt = sbuf.st_mode & S_IFMT;
if (ifmt == S_IFREG || ifmt == S_IFLNK
|| ifmt == S_IFDIR) {
charct = sbuf.st_size;
} else {
while ((len = read(fd, buf, MAXBSIZE)) > 0)
charct += len;
if (len == -1) {
warn("%s", file);
rval = 1;
}
}
}
}
} else {
/* Do it the hard way... */
gotsp = 1;
while ((len = read(fd, buf, MAXBSIZE)) > 0) {
/*
* This loses in the presence of multi-byte characters.
* To do it right would require a function to return a
* character while knowing how many bytes it consumed.
*/
charct += len;
for (C = buf; len--; ++C) {
if (isspace (*C)) {
gotsp = 1;
if (*C == '\n')
++linect;
} else {
/*
* This line implements the POSIX
* spec, i.e. a word is a "maximal
* string of characters delimited by
* whitespace." Notice nothing was
* said about a character being
* printing or non-printing.
*/
if (gotsp) {
gotsp = 0;
++wordct;
}
}
}
}
if (len == -1) {
warn("%s", file);
rval = 1;
}
}
print_counts(linect, wordct, charct, file);
/*
* Don't bother checking doline, doword, or dochar -- speeds
* up the common case
*/
tlinect += linect;
twordct += wordct;
tcharct += charct;
if (close(fd) != 0) {
warn("%s", file);
rval = 1;
}
}
void
format_and_print(long long v)
{
if (humanchar) {
char result[FMT_SCALED_STRSIZE];
(void)fmt_scaled(v, result);
(void)printf("%7s", result);
} else {
(void)printf(" %7lld", v);
}
}
void
print_counts(int64_t lines, int64_t words, int64_t chars, char *name)
{
if (doline)
format_and_print((long long)lines);
if (doword)
format_and_print((long long)words);
if (dochar)
format_and_print((long long)chars);
if (name)
(void)printf(" %s\n", name);
else
(void)printf("\n");
}