first commit

jansson/test/suites/api/test_memory_funcs.c

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+#include <jansson.h>
+#include <string.h>
+
+#include "util.h"
+
+static int malloc_called = 0;
+static int free_called = 0;
+static size_t malloc_used = 0;
+
+/* helpers */
+static void create_and_free_complex_object() {
+    json_t *obj;
+
+    obj = json_pack("{s:i,s:n,s:b,s:b,s:{s:s},s:[i,i,i]}", "foo", 42, "bar", "baz", 1,
+                    "qux", 0, "alice", "bar", "baz", "bob", 9, 8, 7);
+
+    json_decref(obj);
+}
+
+static void create_and_free_object_with_oom() {
+    int i;
+    char key[4];
+    json_t *obj = json_object();
+
+    for (i = 0; i < 10; i++) {
+        snprintf(key, sizeof key, "%d", i);
+        json_object_set_new(obj, key, json_integer(i));
+    }
+
+    json_decref(obj);
+}
+
+static void *my_malloc(size_t size) {
+    malloc_called = 1;
+    return malloc(size);
+}
+
+static void my_free(void *ptr) {
+    free_called = 1;
+    free(ptr);
+}
+
+static void test_simple() {
+    json_malloc_t mfunc = NULL;
+    json_free_t ffunc = NULL;
+
+    json_set_alloc_funcs(my_malloc, my_free);
+    json_get_alloc_funcs(&mfunc, &ffunc);
+    create_and_free_complex_object();
+
+    if (malloc_called != 1 || free_called != 1 || mfunc != my_malloc || ffunc != my_free)
+        fail("Custom allocation failed");
+}
+
+static void *oom_malloc(size_t size) {
+    if (malloc_used + size > 800)
+        return NULL;
+
+    malloc_used += size;
+    return malloc(size);
+}
+
+static void oom_free(void *ptr) {
+    free_called++;
+    free(ptr);
+}
+
+static void test_oom() {
+    free_called = 0;
+    json_set_alloc_funcs(oom_malloc, oom_free);
+    create_and_free_object_with_oom();
+
+    if (free_called == 0)
+        fail("Allocation with OOM failed");
+}
+
+/*
+  Test the secure memory functions code given in the API reference
+  documentation, but by using plain memset instead of
+  guaranteed_memset().
+*/
+
+static void *secure_malloc(size_t size) {
+    /* Store the memory area size in the beginning of the block */
+    void *ptr = malloc(size + 8);
+    *((size_t *)ptr) = size;
+    return (char *)ptr + 8;
+}
+
+static void secure_free(void *ptr) {
+    size_t size;
+
+    ptr = (char *)ptr - 8;
+    size = *((size_t *)ptr);
+
+    /*guaranteed_*/ memset(ptr, 0, size + 8);
+    free(ptr);
+}
+
+static void test_secure_funcs(void) {
+    json_set_alloc_funcs(secure_malloc, secure_free);
+    create_and_free_complex_object();
+}
+
+static void test_bad_args(void) {
+    /* The result of this test is not crashing. */
+    json_get_alloc_funcs(NULL, NULL);
+}
+
+static void run_tests() {
+    test_simple();
+    test_secure_funcs();
+    test_oom();
+    test_bad_args();
+}