Jsonic fuzz tester

fuzz.c

// Fuzz test for Jsonic
//   $ afl-gcc -m32 -fsanitize=address,undefined fuzz.c jsonic.c
//   $ afl-fuzz -m800 -iexamples/heroes -oout ./a.out
// https://github.com/rohanrhu/jsonic
// This is free and unencumbered software released into the public domain.
#include <stdio.h>
#include <stdlib.h>
#include "jsonic.h"

static int explore(jsonic_node_t *root, char *buf)
{
    jsonic_node_t *key = 0;
    switch (root->type) {
    case JSONIC_NONE:
        return 1;
    case JSONIC_OBJECT:
        for (;;) {
            key = jsonic_object_iter_kv_free(buf, root, key);
            if (key->type == JSONIC_NONE) {
                return 0;
            }
            printf("=> %s\n", key->key);
            if (explore(key, buf)) {
                return 1;
            }
        }
    case JSONIC_ARRAY:
        for (;;) {
            jsonic_node_t *e = jsonic_array_iter_free(buf, root, e, 0);
            if (e->type == JSONIC_NONE) {
                return 0;
            }
            if (explore(e, buf)) {
                return 1;
            }
        }
    case JSONIC_STRING:
    case JSONIC_NUMBER:
    case JSONIC_BOOLEAN:
    case JSONIC_NULL:
        puts(root->val);
        return 0;
    }
    abort();
}

int main(void)
{
    char *buf = malloc(1<<10);
    int len = fread(buf, 1, (1<<10)-1, stdin);
    buf[len++] = 0;
    buf = realloc(buf, len);
    return explore(jsonic_get_root(buf), buf);
}

It is nice just ~70 SLOC 🙀