jansson/test/suites/api/test_chaos.c

#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif

#include <stdio.h>
#include <string.h>
#include <jansson.h>
#include "util.h"

static int chaos_pos = 0;
static int chaos_fail = 0;
#define CHAOS_MAX_FAILURE 100

void *chaos_malloc(size_t size)
{
    if (chaos_pos == chaos_fail)
        return NULL;

    chaos_pos++;

    return malloc(size);
}

void chaos_free(void *obj)
{
    free(obj);
}

/* Test all potential allocation failures. */
#define chaos_loop(condition, code, cleanup) \
    { \
        chaos_pos = chaos_fail = 0; \
        while (condition) { \
            if (chaos_fail > CHAOS_MAX_FAILURE) \
                fail("too many chaos failures"); \
            code \
            chaos_pos = 0; \
            chaos_fail++; \
        } \
        cleanup \
    }

#define chaos_loop_new_value(json, initcall) \
    chaos_loop(!json, json = initcall;, json_decref(json); json = NULL;)

static void test_chaos()
{
    json_malloc_t orig_malloc;
    json_free_t orig_free;
    json_t *json = NULL;
    json_t *obj = json_object();
    json_t *arr1 = json_array();
    json_t *arr2 = json_array();
    json_t *txt = json_string("test");
    json_t *intnum = json_integer(1);
    json_t *dblnum = json_real(0.5);
    int keyno;

    if (!obj || !arr1 || !arr2 || !txt || !intnum || !dblnum)
        fail("failed to allocate basic objects");

    json_get_alloc_funcs(&orig_malloc, &orig_free);
    json_set_alloc_funcs(chaos_malloc, chaos_free);

    chaos_loop_new_value(json, json_pack("{s:s}", "key", "value"));
    chaos_loop_new_value(json, json_pack("{s:[]}", "key"));
    chaos_loop_new_value(json, json_pack("[biIf]", 1, 1, (json_int_t)1, 1.0));
    chaos_loop_new_value(json, json_pack("[s*,s*]", "v1", "v2"));
    chaos_loop_new_value(json, json_pack("o", json_incref(txt)));
    chaos_loop_new_value(json, json_pack("O", txt));
    chaos_loop_new_value(json, json_pack("s++", "a",
        "long string to force realloc",
        "another long string to force yet another reallocation of the string because "
        "that's what we are testing."));

    chaos_loop_new_value(json, json_copy(obj));
    chaos_loop_new_value(json, json_deep_copy(obj));

    chaos_loop_new_value(json, json_copy(arr1));
    chaos_loop_new_value(json, json_deep_copy(arr1));

    chaos_loop_new_value(json, json_copy(txt));
    chaos_loop_new_value(json, json_copy(intnum));
    chaos_loop_new_value(json, json_copy(dblnum));

    chaos_loop_new_value(json, json_sprintf("%s", "string"));

    for (keyno = 0; keyno < 100; ++keyno) {
#if !defined(_MSC_VER) || _MSC_VER >= 1900
        /* Skip this test on old Windows compilers. */
        char testkey[10];

        snprintf(testkey, sizeof(testkey), "test%d", keyno);
        chaos_loop(json_object_set_new_nocheck(obj, testkey, json_object()),,);
#endif
        chaos_loop(json_array_append_new(arr1, json_null()),,);
        chaos_loop(json_array_insert_new(arr2, 0, json_null()),,);
    }

    chaos_loop(json_array_extend(arr1, arr2),,);
    chaos_loop(json_string_set_nocheck(txt, "test"),,);

    json_set_alloc_funcs(orig_malloc, orig_free);
    json_decref(obj);
    json_decref(arr1);
    json_decref(arr2);
    json_decref(txt);
    json_decref(intnum);
    json_decref(dblnum);
}

static void run_tests()
{
    test_chaos();
}