2011-06-09 20:55:12 -04:00
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/* See LICENSE file for copyright and license details. */
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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2011-06-18 01:42:24 -04:00
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#include "util.h"
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enum { Same = 0, Diff = 1, Error = 2 };
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2011-06-09 20:55:12 -04:00
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2013-06-14 14:20:47 -04:00
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static void
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usage(void)
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{
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2014-03-04 05:33:51 -05:00
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enprintf(Error, "usage: %s [-ls] file1 [file2]\n", argv0);
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2013-06-14 14:20:47 -04:00
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}
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2011-06-09 20:55:12 -04:00
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int
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main(int argc, char *argv[])
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{
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2011-06-09 21:00:27 -04:00
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bool lflag = false;
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bool sflag = false;
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2011-06-09 20:55:12 -04:00
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bool same = true;
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int b[2], i;
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long line = 1, n = 1;
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FILE *fp[2];
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2013-06-14 14:20:47 -04:00
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ARGBEGIN {
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case 'l':
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lflag = true;
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break;
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case 's':
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sflag = true;
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break;
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default:
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usage();
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} ARGEND;
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2014-03-04 05:33:51 -05:00
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if (argc < 1 || argc > 2)
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2013-06-14 14:20:47 -04:00
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usage();
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2014-03-04 05:33:51 -05:00
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fp[0] = fopen(argv[0], "r");
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if (!fp[0])
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enprintf(Error, "fopen %s:", argv[0]);
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fp[1] = stdin;
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if (argc == 2)
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fp[1] = fopen(argv[1], "r");
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if (!fp[1])
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enprintf(Error, "fopen %s:", argv[1]);
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2014-04-01 09:06:42 -04:00
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for(n = 1; ; n++) {
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b[0] = getc(fp[0]);
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b[1] = getc(fp[1]);
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if(b[0] == EOF && b[1] == EOF)
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break;
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2014-04-01 09:13:30 -04:00
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if(b[0] == '\n' && b[1] == '\n')
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2011-06-09 20:55:12 -04:00
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line++;
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if(b[0] == b[1])
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continue;
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2014-04-01 09:14:21 -04:00
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for(i = 0; i < 2; i++) {
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if(b[i] == EOF) {
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if(!sflag)
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fprintf(stderr, "cmp: EOF on %s\n",
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!argv[i] ? "<stdin>" : argv[i]);
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exit(Diff);
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}
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}
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2014-04-01 10:53:15 -04:00
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if(!lflag) {
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2011-06-09 20:55:12 -04:00
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if(!sflag)
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printf("%s %s differ: char %ld, line %ld\n",
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2014-03-04 05:33:51 -05:00
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argv[0], !argv[1] ? "<stdin>" : argv[1], n, line);
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2011-06-18 01:42:24 -04:00
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exit(Diff);
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2013-06-14 14:20:47 -04:00
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} else {
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2011-06-09 20:55:12 -04:00
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printf("%4ld %3o %3o\n", n, b[0], b[1]);
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same = false;
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}
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}
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2011-06-18 01:42:24 -04:00
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return same ? Same : Diff;
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2011-06-09 20:55:12 -04:00
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}
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