sbase/cmp.c

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/* See LICENSE file for copyright and license details. */
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int
main(int argc, char *argv[])
{
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bool lflag = false;
bool sflag = false;
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bool same = true;
char c;
int b[2], i;
long line = 1, n = 1;
FILE *fp[2];
if((c = getopt(argc, argv, "ls")) != -1)
switch(c) {
case 'l':
lflag = true;
break;
case 's':
sflag = true;
break;
default:
exit(2);
}
if(optind != argc-2) {
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fprintf(stderr, "usage: %s [-ls] file1 file2\n", argv[0]);
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exit(2);
}
for(i = 0; i < 2; i++)
if(!(fp[i] = fopen(argv[optind+i], "r"))) {
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fprintf(stderr, "fopen %s:", argv[optind+i]);
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exit(2);
}
for(n = 1; ((b[0] = getc(fp[0])) != EOF) | ((b[1] = getc(fp[1])) != EOF); n++) {
if(b[0] == '\n')
line++;
if(b[0] == b[1])
continue;
for(i = 0; i < 2; i++)
if(b[i] == EOF) {
fprintf(stderr, "cmp: EOF on %s\n", argv[optind+i]);
return 1;
}
if(!lflag) {
if(!sflag)
printf("%s %s differ: char %ld, line %ld\n",
argv[optind], argv[optind+1], n, line);
return 1;
}
else {
printf("%4ld %3o %3o\n", n, b[0], b[1]);
same = false;
}
}
return same ? 0 : 1;
}