The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 1 | #include <stdio.h> |
| 2 | #include <stdlib.h> |
| 3 | #include <string.h> |
| 4 | #include <stdint.h> |
Olivier Bailly | b93e581 | 2010-11-17 11:47:23 -0800 | [diff] [blame^] | 5 | #include <unistd.h> |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 6 | #include <fcntl.h> |
| 7 | #include <sys/ioctl.h> |
| 8 | #include <errno.h> |
| 9 | |
| 10 | int cmp_main(int argc, char *argv[]) |
| 11 | { |
| 12 | int c; |
| 13 | int fd1, fd2; |
| 14 | char buf1[4096], buf2[4096]; |
| 15 | int res, res1, res2; |
| 16 | int rv = 0; |
| 17 | int i; |
| 18 | int filepos = 0; |
| 19 | |
| 20 | int show_byte = 0; |
| 21 | int show_all = 0; |
| 22 | int limit = 0; |
| 23 | |
| 24 | do { |
| 25 | c = getopt(argc, argv, "bln:"); |
| 26 | if (c == EOF) |
| 27 | break; |
| 28 | switch (c) { |
| 29 | case 'b': |
| 30 | show_byte = 1; |
| 31 | break; |
| 32 | case 'l': |
| 33 | show_all = 1; |
| 34 | break; |
| 35 | case 'n': |
| 36 | limit = atoi(optarg); |
| 37 | break; |
| 38 | case '?': |
| 39 | fprintf(stderr, "%s: invalid option -%c\n", |
| 40 | argv[0], optopt); |
| 41 | exit(1); |
| 42 | } |
| 43 | } while (1); |
| 44 | |
| 45 | if (optind + 2 != argc) { |
| 46 | fprintf(stderr, "Usage: %s [-b] [-l] [-n count] file1 file2\n", argv[0]); |
| 47 | exit(1); |
| 48 | } |
| 49 | |
| 50 | fd1 = open(argv[optind], O_RDONLY); |
| 51 | if(fd1 < 0) { |
| 52 | fprintf(stderr, "could not open %s, %s\n", argv[optind], strerror(errno)); |
| 53 | return 1; |
| 54 | } |
| 55 | |
| 56 | fd2 = open(argv[optind+1], O_RDONLY); |
| 57 | if(fd2 < 0) { |
| 58 | fprintf(stderr, "could not open %s, %s\n", argv[optind+1], strerror(errno)); |
| 59 | return 1; |
| 60 | } |
| 61 | |
| 62 | while(1) { |
| 63 | res1 = read(fd1, &buf1, sizeof(buf1)); |
| 64 | res2 = read(fd2, &buf2, sizeof(buf2)); |
| 65 | res = res1 < res2 ? res1 : res2; |
| 66 | if(res1 == 0 && res2 == 0) { |
| 67 | return rv; |
| 68 | } |
| 69 | for(i = 0; i < res; i++) { |
| 70 | if(buf1[i] != buf2[i]) { |
| 71 | printf("%s %s differ byte %d", argv[optind], argv[optind+1], filepos + i); |
| 72 | if(show_byte) |
| 73 | printf(" 0x%02x 0x%02x", buf1[i], buf2[i]); |
| 74 | printf("\n"); |
| 75 | if(!show_all) |
| 76 | return 1; |
| 77 | rv = 1; |
| 78 | } |
| 79 | if(limit) { |
| 80 | limit--; |
| 81 | if(limit == 0) |
| 82 | return rv; |
| 83 | } |
| 84 | } |
| 85 | if(res1 != res2 || res < 0) { |
| 86 | printf("%s on %s\n", res < 0 ? "Read error" : "EOF", res1 < res2 ? argv[optind] : argv[optind+1]); |
| 87 | return 1; |
| 88 | } |
| 89 | filepos += res; |
| 90 | } |
| 91 | } |