kore

commit e47806c66908630bf4a917bb9465ecc71fe8a472
parent 620cc231dcdd4534f59bda7d27a50e3a7f3b9311
Author: Joris Vink <joris@coders.se>
Date:   Wed, 25 Jan 2017 22:07:08 +0100

allow memory allocators to deal with 0 bytes.

we just increase the lenght requested to 8 bytes if we get a 0 byte request.

additionally when kore_realloc() is called check if we actually have
to do the work, if not just return the original pointer.

Diffstat:
src/mem.c
 | 
9
+++------

1 file changed, 3 insertions(+), 6 deletions(-)
diff --git a/src/mem.c b/src/mem.c
@@ -78,7 +78,7 @@ kore_malloc(size_t len)
 	size_t			mlen, idx, *plen;
 
 	if (len == 0)
-		fatal("kore_malloc(): zero size");
+		len = 8;
 
 	if (len <= KORE_MEM_BLOCK_SIZE_MAX) {
 		idx = memblock_index(len);
@@ -105,12 +105,11 @@ kore_realloc(void *ptr, size_t len)
 	struct meminfo		*mem;
 	void			*nptr;
 
-	if (len == 0)
-		fatal("kore_realloc(): zero size");
-
 	if (ptr == NULL) {
 		nptr = kore_malloc(len);
 	} else {
+		if (len == KORE_MEMSIZE(ptr))
+			return (ptr);
 		mem = KORE_MEMINFO(ptr);
 		if (mem->magic != KORE_MEM_MAGIC)
 			fatal("kore_realloc(): magic boundary not found");
@@ -126,8 +125,6 @@ kore_realloc(void *ptr, size_t len)
 void *
 kore_calloc(size_t memb, size_t len)
 {
-	if (memb == 0 || len == 0)
-		fatal("kore_calloc(): zero size");
 	if (SIZE_MAX / memb < len)
 		fatal("kore_calloc(): memb * len > SIZE_MAX");