Skip to content
This repository

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
branch: master
Fetching contributors…

Octocat-spinner-32-eaf2f5

Cannot retrieve contributors at this time

file 92 lines (84 sloc) 2.035 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <errno.h>

int cmp_main(int argc, char *argv[])
{
    int c;
    int fd1, fd2;
char buf1[4096], buf2[4096];
    int res, res1, res2;
int rv = 0;
int i;
int filepos = 0;

int show_byte = 0;
int show_all = 0;
int limit = 0;

    do {
        c = getopt(argc, argv, "bln:");
        if (c == EOF)
            break;
        switch (c) {
        case 'b':
            show_byte = 1;
            break;
        case 'l':
            show_all = 1;
            break;
        case 'n':
            limit = atoi(optarg);
            break;
        case '?':
            fprintf(stderr, "%s: invalid option -%c\n",
                argv[0], optopt);
            exit(1);
        }
    } while (1);

    if (optind + 2 != argc) {
        fprintf(stderr, "Usage: %s [-b] [-l] [-n count] file1 file2\n", argv[0]);
        exit(1);
    }

    fd1 = open(argv[optind], O_RDONLY);
    if(fd1 < 0) {
        fprintf(stderr, "could not open %s, %s\n", argv[optind], strerror(errno));
        return 1;
    }

    fd2 = open(argv[optind+1], O_RDONLY);
    if(fd2 < 0) {
        fprintf(stderr, "could not open %s, %s\n", argv[optind+1], strerror(errno));
        return 1;
    }
    
    while(1) {
        res1 = read(fd1, &buf1, sizeof(buf1));
        res2 = read(fd2, &buf2, sizeof(buf2));
res = res1 < res2 ? res1 : res2;
if(res1 == 0 && res2 == 0) {
return rv;
}
for(i = 0; i < res; i++) {
if(buf1[i] != buf2[i]) {
printf("%s %s differ byte %d", argv[optind], argv[optind+1], filepos + i);
if(show_byte)
printf(" 0x%02x 0x%02x", buf1[i], buf2[i]);
printf("\n");
if(!show_all)
return 1;
rv = 1;
}
if(limit) {
limit--;
if(limit == 0)
return rv;
}
}
if(res1 != res2 || res < 0) {
printf("%s on %s\n", res < 0 ? "Read error" : "EOF", res1 < res2 ? argv[optind] : argv[optind+1]);
return 1;
}
filepos += res;
    }
}
Something went wrong with that request. Please try again.