From 5b1b3bec3f25ea5fc1f48c269f300c4211a1bac7 Mon Sep 17 00:00:00 2001 From: Jon Santmyer Date: Fri, 19 Apr 2024 16:11:24 -0400 Subject: initial commit; mostly documented. --- reallocarray.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 reallocarray.c (limited to 'reallocarray.c') diff --git a/reallocarray.c b/reallocarray.c new file mode 100644 index 0000000..fc492f0 --- /dev/null +++ b/reallocarray.c @@ -0,0 +1,30 @@ +#include "malloc.h" +#include +#include + +void* +__reallocarray_impl(heap_cache_t *cache, void *ptr, size_t nmemb, size_t w) +{ + /* Free if w == nmemb == 0*/ + if(w == 0 || nmemb == 0) { + __free_impl(cache, ptr); + return NULL; + } + + if(ptr == NULL) + return __calloc_impl(cache, nmemb, w); + + size_t allocw = w * nmemb; + w = REALW(w); + + bucket_obj_t *obj = OBJ_FROM_PTR(ptr); + assert(OBJ_VALID(obj)); + size_t oldw = OBJ_WIDTH(obj); + if(allocw < oldw) return ptr; + + ptr = __realloc_impl(cache, ptr, allocw); + size_t wdiff = allocw - oldw; + void *zeroat = (void*)(((uintptr_t)ptr) + oldw); + memset(zeroat, 0, wdiff); + return ptr; +} -- cgit v1.2.1