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>
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#include "util.h"
enum { Same = 0, Diff = 1, Error = 2 };
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static void
usage(void)
{
enprintf(Error, "usage: %s [-ls] file1 [file2]\n", argv0);
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}
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int
main(int argc, char *argv[])
{
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bool lflag = false;
bool sflag = false;
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bool same = true;
int b[2], i;
long line = 1, n = 1;
FILE *fp[2];
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ARGBEGIN {
case 'l':
lflag = true;
break;
case 's':
sflag = true;
break;
default:
usage();
} ARGEND;
if (argc < 1 || argc > 2)
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usage();
fp[0] = fopen(argv[0], "r");
if (!fp[0]) {
if(!sflag)
weprintf("fopen %s:", argv[0]);
exit(Error);
}
fp[1] = stdin;
if (argc == 2) {
if(!(fp[1] = fopen(argv[1], "r"))) {
if(!sflag)
weprintf("fopen %s:", argv[1]);
exit(Error);
}
}
for(n = 1; ; n++) {
b[0] = getc(fp[0]);
b[1] = getc(fp[1]);
if(b[0] == EOF && b[1] == EOF)
break;
if(b[0] == '\n' && b[1] == '\n')
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line++;
if(b[0] == b[1])
continue;
for(i = 0; i < 2; i++) {
if(b[i] == EOF) {
if(!sflag)
fprintf(stderr, "cmp: EOF on %s\n",
!argv[i] ? "<stdin>" : argv[i]);
exit(Diff);
}
}
if(!lflag) {
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if(!sflag)
printf("%s %s differ: char %ld, line %ld\n",
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("%4ld %3o %3o\n", n, b[0], b[1]);
same = false;
}
}
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return same ? Same : Diff;
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}