91 lines
2 KiB
C
91 lines
2 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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int cmp_main(int argc, char *argv[])
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{
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int c;
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int fd1, fd2;
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char buf1[4096], buf2[4096];
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int res, res1, res2;
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int rv = 0;
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int i;
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int filepos = 0;
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int show_byte = 0;
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int show_all = 0;
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int limit = 0;
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do {
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c = getopt(argc, argv, "bln:");
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if (c == EOF)
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break;
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switch (c) {
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case 'b':
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show_byte = 1;
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break;
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case 'l':
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show_all = 1;
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break;
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case 'n':
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limit = atoi(optarg);
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break;
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case '?':
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fprintf(stderr, "%s: invalid option -%c\n",
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argv[0], optopt);
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exit(1);
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}
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} while (1);
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if (optind + 2 != argc) {
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fprintf(stderr, "Usage: %s [-b] [-l] [-n count] file1 file2\n", argv[0]);
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exit(1);
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}
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fd1 = open(argv[optind], O_RDONLY);
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if(fd1 < 0) {
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fprintf(stderr, "could not open %s, %s\n", argv[optind], strerror(errno));
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return 1;
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}
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fd2 = open(argv[optind+1], O_RDONLY);
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if(fd2 < 0) {
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fprintf(stderr, "could not open %s, %s\n", argv[optind+1], strerror(errno));
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return 1;
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}
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while(1) {
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res1 = read(fd1, &buf1, sizeof(buf1));
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res2 = read(fd2, &buf2, sizeof(buf2));
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res = res1 < res2 ? res1 : res2;
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if(res1 == 0 && res2 == 0) {
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return rv;
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}
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for(i = 0; i < res; i++) {
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if(buf1[i] != buf2[i]) {
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printf("%s %s differ byte %d", argv[optind], argv[optind+1], filepos + i);
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if(show_byte)
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printf(" 0x%02x 0x%02x", buf1[i], buf2[i]);
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printf("\n");
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if(!show_all)
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return 1;
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rv = 1;
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}
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if(limit) {
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limit--;
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if(limit == 0)
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return rv;
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}
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}
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if(res1 != res2 || res < 0) {
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printf("%s on %s\n", res < 0 ? "Read error" : "EOF", res1 < res2 ? argv[optind] : argv[optind+1]);
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return 1;
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}
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filepos += res;
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}
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}
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