clang fuzzing

fuzzer.c

#include <stdio.h>
#include <string.h>

// clang -O0  -Wall -g -fsanitize=fuzzer fuzzer.c && ./a.out

int LLVMFuzzerTestOneInput(const char *Data, size_t Size)
{

    int maxlen  = (int) Size;
    const char *start = Data;

    char *end, *aaa;
    int len;

    while (maxlen > 0) {
        end = memchr(start, '\0', maxlen);
        aaa = memchr(start,  'a', maxlen);

        if (aaa == NULL || end == NULL) {
            return 1;
        }

        len = end - aaa;
        if (len <= 0) {
            return 1;
        }

        maxlen -= (end - start) + 1;
    }

    return 0;
}