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);
}