#if 0 exec clang -Weverything -Wno-vla $@ -o $(dirname $0)/xx $0 #endif #include #include #include #include #include #include static bool zero(const uint8_t *buf, size_t len) { for (size_t i = 0; i < len; ++i) if (buf[i]) return false; return true; } enum { FLAG_ASCII = 1, FLAG_OFFSET = 2, FLAG_SKIP = 4, }; int main(int argc, char **argv) { size_t cols = 16; size_t group = 8; uint8_t flags = FLAG_ASCII | FLAG_OFFSET; char *path = NULL; while (getopt(argc, argv, "ac:fg:hk") > 0) { if (optopt == 'a') flags ^= FLAG_ASCII; else if (optopt == 'c') cols = (size_t) strtol(optarg, NULL, 10); else if (optopt == 'f') flags ^= FLAG_OFFSET; else if (optopt == 'g') group = (size_t) strtol(optarg, NULL, 10); else if (optopt == 'k') flags ^= FLAG_SKIP; else { printf("usage: xx [-afk] [-c N] [-g N] [FILE]\n"); return (optopt == 'h') ? EXIT_SUCCESS : EXIT_FAILURE; } } if (!cols) return EXIT_FAILURE; if (argc > optind) path = argv[optind]; FILE *file = path ? fopen(path, "r") : stdin; if (!file) { perror(path); return EXIT_FAILURE; } uint8_t buf[cols]; size_t offset = 0, len = 0, i; for (;;) { offset += len; len = fread(buf, 1, sizeof(buf), file); if (!len) break; if ((flags & FLAG_SKIP) && len == sizeof(buf)) { static bool skip = false; if (zero(buf, len)) { if (!skip) printf("*\n"); skip = true; continue; } skip = false; } if (flags & FLAG_OFFSET) printf("%08zx: ", offset); for (i = 0; i < len; ++i) { if (group && i && !(i % group)) printf(" "); printf("%02x ", buf[i]); } if (flags & FLAG_ASCII) { for (i = len; i < cols; ++i) printf((group && !(i % group)) ? " " : " "); printf(" "); for (i = 0; i < len; ++i) printf("%c", isprint(buf[i]) ? buf[i] : '.'); } printf("\n"); if (len < sizeof(buf)) break; } if (ferror(file)) { perror(path); return EXIT_FAILURE; } return EXIT_SUCCESS; }