バイナリダンプ用 Helper ref: http://qiita.com/items/af61f02772e8a06caca8

dump_memory.c

void dump_memory(const void* data, size_t length) {
    const int LINE_BYTES = 16;

    char buffer[LINE_BYTES + 1];
    buffer[LINE_BYTES] = 0;

    for (int i = 0; i < length; i++) {
        if (i % LINE_BYTES == 0) {
            printf("%06x: ", i);
        }

        unsigned char tc = ((const unsigned char*)data)[i];
        printf(" %02x", tc);
        if (tc <= 31 || 127 <= tc) {
            buffer[i % LINE_BYTES] = '.';
        } else {
            buffer[i % LINE_BYTES] = tc;
        }

        if (i % LINE_BYTES == LINE_BYTES - 1) {
            printf("  | %s\n", buffer);
        }
    }

    printf("\n");
}