87 lines
1.5 KiB
C
87 lines
1.5 KiB
C
/* See LICENSE file for copyright and license details. */
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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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#include "util.h"
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enum { Same = 0, Diff = 1, Error = 2 };
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static void
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usage(void)
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{
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enprintf(Error, "usage: %s [-l | -s] file1 file2\n", argv0);
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}
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int
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main(int argc, char *argv[])
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{
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int lflag = 0;
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int sflag = 0;
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int same = 1;
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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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ARGBEGIN {
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case 'l':
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lflag = 1;
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break;
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case 's':
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sflag = 1;
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break;
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default:
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usage();
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} ARGEND;
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if (argc != 2 || (lflag && sflag))
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usage();
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if (argv[0][0] == '-' && !argv[0][1])
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argv[0] = "/dev/fd/0";
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fp[0] = fopen(argv[0], "r");
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if (!fp[0]) {
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if (!sflag)
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weprintf("fopen %s:", argv[0]);
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exit(Error);
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}
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if (argv[1][0] == '-' && !argv[1][1])
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argv[1] = "/dev/fd/0";
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fp[1] = fopen(argv[1], "r");
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if (!fp[1]) {
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if (!sflag)
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weprintf("fopen %s:", argv[1]);
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exit(Error);
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}
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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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if (b[0] == '\n' && b[1] == '\n')
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line++;
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if (b[0] == b[1])
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continue;
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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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if (!lflag) {
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if (!sflag)
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printf("%s %s differ: char %ld, line %ld\n",
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argv[0], !argv[1] ? "<stdin>" : argv[1], n, line);
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exit(Diff);
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} else {
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printf("%ld %o %o\n", n, b[0], b[1]);
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same = 0;
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}
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}
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return same ? Same : Diff;
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}
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