-static inline void qsort_safe(void *base, size_t nmemb, size_t size,
- int (*compar)(const void *, const void *)) {
- if (nmemb) {
- assert(base);
- qsort(base, nmemb, size, compar);
- }
+static inline void qsort_safe(void *base, size_t nmemb, size_t size, comparison_fn_t compar) {
+ if (nmemb <= 0)
+ return;
+
+ assert(base);
+ qsort(base, nmemb, size, compar);
+}
+
+/* Normal memmem() requires haystack to be nonnull, which is annoying for zero-length buffers */
+static inline void *memmem_safe(const void *haystack, size_t haystacklen, const void *needle, size_t needlelen) {
+
+ if (needlelen <= 0)
+ return (void*) haystack;
+
+ if (haystacklen < needlelen)
+ return NULL;
+
+ assert(haystack);
+ assert(needle);
+
+ return memmem(haystack, haystacklen, needle, needlelen);