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7a19d1bbb9
builtins (e.g., exit, strcmp).
219 lines
5.0 KiB
C
219 lines
5.0 KiB
C
/*
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* Copyright (c) 1989, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Case Larsen.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1989, 1993, 1994\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "From: @(#)comm.c 8.4 (Berkeley) 5/4/95";
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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include <ctype.h>
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#include <err.h>
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#include <limits.h>
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#include <locale.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#define MAXLINELEN (LINE_MAX + 1)
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char *tabs[] = { "", "\t", "\t\t" };
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FILE *file __P((char *));
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void show __P((FILE *, char *, char *));
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int stricoll __P((char *, char *));
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static void usage __P((void));
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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int comp, file1done = 0, file2done = 0, read1, read2;
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int ch, flag1, flag2, flag3, iflag;
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FILE *fp1, *fp2;
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char *col1, *col2, *col3;
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char **p, line1[MAXLINELEN], line2[MAXLINELEN];
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flag1 = flag2 = flag3 = 1;
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iflag = 0;
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(void) setlocale(LC_CTYPE, "");
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while ((ch = getopt(argc, argv, "-123i")) != -1)
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switch(ch) {
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case '-':
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--optind;
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goto done;
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case '1':
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flag1 = 0;
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break;
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case '2':
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flag2 = 0;
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break;
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case '3':
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flag3 = 0;
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break;
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case 'i':
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iflag = 1;
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break;
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case '?':
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default:
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usage();
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}
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done: argc -= optind;
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argv += optind;
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if (argc != 2)
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usage();
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fp1 = file(argv[0]);
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fp2 = file(argv[1]);
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/* for each column printed, add another tab offset */
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p = tabs;
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col1 = col2 = col3 = NULL;
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if (flag1)
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col1 = *p++;
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if (flag2)
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col2 = *p++;
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if (flag3)
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col3 = *p;
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for (read1 = read2 = 1;;) {
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/* read next line, check for EOF */
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if (read1)
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file1done = !fgets(line1, MAXLINELEN, fp1);
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if (read2)
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file2done = !fgets(line2, MAXLINELEN, fp2);
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/* if one file done, display the rest of the other file */
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if (file1done) {
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if (!file2done && col2)
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show(fp2, col2, line2);
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break;
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}
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if (file2done) {
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if (!file1done && col1)
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show(fp1, col1, line1);
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break;
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}
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/* lines are the same */
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if(iflag)
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comp = stricoll(line1, line2);
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else
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comp = strcoll(line1, line2);
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if (!comp) {
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read1 = read2 = 1;
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if (col3)
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(void)printf("%s%s", col3, line1);
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continue;
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}
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/* lines are different */
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if (comp < 0) {
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read1 = 1;
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read2 = 0;
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if (col1)
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(void)printf("%s%s", col1, line1);
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} else {
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read1 = 0;
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read2 = 1;
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if (col2)
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(void)printf("%s%s", col2, line2);
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}
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}
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exit(0);
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}
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void
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show(fp, offset, buf)
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FILE *fp;
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char *offset, *buf;
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{
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do {
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(void)printf("%s%s", offset, buf);
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} while (fgets(buf, MAXLINELEN, fp));
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}
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FILE *
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file(name)
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char *name;
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{
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FILE *fp;
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if (!strcmp(name, "-"))
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return (stdin);
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if ((fp = fopen(name, "r")) == NULL) {
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err(1, "%s", name);
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}
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return (fp);
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}
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static void
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usage()
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{
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(void)fprintf(stderr, "usage: comm [-123i] file1 file2\n");
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exit(1);
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}
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int
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stricoll(s1, s2)
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char *s1, *s2;
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{
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char *p, line1[MAXLINELEN], line2[MAXLINELEN];
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for (p = line1; *s1; s1++)
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*p++ = tolower((unsigned char)*s1);
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*p = '\0';
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for (p = line2; *s2; s2++)
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*p++ = tolower((unsigned char)*s2);
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*p = '\0';
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return strcoll(line1, line2);
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}
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