diff options
Diffstat (limited to 'btrfs-crc.c')
| -rw-r--r-- | btrfs-crc.c | 27 |
1 files changed, 16 insertions, 11 deletions
diff --git a/btrfs-crc.c b/btrfs-crc.c index 723e0b7a..c3e47747 100644 --- a/btrfs-crc.c +++ b/btrfs-crc.c @@ -22,15 +22,17 @@ #include "crc32c.h" #include "utils.h" -void usage(void) +void print_usage(int status) { printf("usage: btrfs-crc filename\n"); printf(" print out the btrfs crc for \"filename\"\n"); - printf("usage: btrfs-crc filename -c crc [-s seed] [-l length]\n"); + printf("usage: btrfs-crc -c crc [-s seed] [-l length]\n"); printf(" brute force search for file names with the given crc\n"); printf(" -s seed the random seed (default: random)\n"); printf(" -l length the length of the file names (default: 10)\n"); - exit(1); + printf("usage: btrfs-crc -h\n"); + printf(" print this message\n"); + exit(status); } int main(int argc, char **argv) @@ -40,7 +42,7 @@ int main(int argc, char **argv) char *str; char *buf; int length = 10; - int seed = getpid() ^ getppid(); + u64 seed = 0; int loop = 0; int i; @@ -54,12 +56,12 @@ int main(int argc, char **argv) loop = 1; break; case 's': - seed = atol(optarg); + seed = atoll(optarg); break; case 'h': - usage(); + print_usage(1); case '?': - return 255; + print_usage(255); } } @@ -67,21 +69,24 @@ int main(int argc, char **argv) str = argv[optind]; if (!loop) { - if (check_argc_min(argc - optind, 1)) - return 255; + if (check_argc_exact(argc - optind, 1)) + print_usage(255); printf("%12u - %s\n", crc32c(~1, str, strlen(str)), str); return 0; } + if (check_argc_exact(argc - optind, 0)) + print_usage(255); buf = malloc(length); if (!buf) return -ENOMEM; - srand(seed); + if (seed) + init_rand_seed(seed); while (1) { for (i = 0; i < length; i++) - buf[i] = rand() % 94 + 33; + buf[i] = rand_range(94) + 33; if (crc32c(~1, buf, length) == checksum) printf("%12lu - %.*s\n", checksum, length, buf); } |