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author | Jon Santmyer <jon@jonsantmyer.com> | 2024-05-22 13:00:41 -0400 |
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committer | Jon Santmyer <jon@jonsantmyer.com> | 2024-05-22 13:00:41 -0400 |
commit | ace65b453151845bc361f21f3e5b651c35f9f126 (patch) | |
tree | 262ebd29b0ca1d8584f0b6f1efa7a00d9f4f3e43 /memory/alloc/reallocarray.c | |
parent | f004c1ade8d617a82cea2fe249434cccb47a2358 (diff) | |
download | jove-kernel-ace65b453151845bc361f21f3e5b651c35f9f126.tar.gz jove-kernel-ace65b453151845bc361f21f3e5b651c35f9f126.tar.bz2 jove-kernel-ace65b453151845bc361f21f3e5b651c35f9f126.zip |
Diffstat (limited to 'memory/alloc/reallocarray.c')
-rw-r--r-- | memory/alloc/reallocarray.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/memory/alloc/reallocarray.c b/memory/alloc/reallocarray.c new file mode 100644 index 0000000..c58dfe9 --- /dev/null +++ b/memory/alloc/reallocarray.c @@ -0,0 +1,37 @@ +/* + * Copyright (c) Jon Santmyer. + * This source file is released under the LGPL Version 3 as detailed in + * the LICENSE file provided in the following repository: + * https://git.jonsantmyer.com/heap/ + * */ + +#include "malloc.h" +#include "assert.h" +#include "string.h" + +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; +} |