xref: /src/usr.bin/wc/wc.c

/*
 * Copyright (c) 1980, 1987 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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
char copyright[] =
"@(#) Copyright (c) 1980, 1987 Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
/*static char sccsid[] = "from: @(#)wc.c	5.7 (Berkeley) 3/2/91";*/
static char rcsid[] = "$Id: wc.c,v 1.8 1993/11/04 05:43:30 jtc Exp $";
#endif /* not lint */

/* wc line, word and char count */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <locale.h>
#include <ctype.h>
#include <errno.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <unistd.h>
#include <err.h>

static void	print_counts();
static void	cnt();
static long	tlinect, twordct, tcharct;
static int	doline, doword, dochar;
static int 	rval = 0;

int
main(argc, argv)
	int argc;
	char **argv;
{
	extern int optind;
	register int ch;

	setlocale(LC_ALL, "");

	while ((ch = getopt(argc, argv, "lwcm")) != -1)
		switch((char)ch) {
		case 'l':
			doline = 1;
			break;
		case 'w':
			doword = 1;
			break;
		case 'c':
		case 'm':
			dochar = 1;
			break;
		case '?':
		default:
			fprintf(stderr, "usage: wc [-c | -m] [-lw] [file ...]\n");
			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);
}


static void
cnt(file)
	char *file;
{
	register u_char *C;
	register short gotsp;
	register int len;
	register long 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) {
			int 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
	{
		/* do it the hard way... */
		gotsp = 1;
		while ((len = read(fd, buf, MAXBSIZE)) > 0) {
			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 ? file : "");

	/* don't bother checkint doline, doword, or dochar --- speeds
           up the common case */
	tlinect += linect;
	twordct += wordct;
	tcharct += charct;

	if (close(fd)) {
		warn ("%s", file);
		rval = 1;
	}
}


void
print_counts (lines, words, chars, name)
	long lines;
	long words;
	long chars;
	char *name;
{

	if (doline)
		printf(" %7ld", lines);
	if (doword)
		printf(" %7ld", words);
	if (dochar)
		printf(" %7ld", chars);

	printf (" %s\n", name);
}