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realloc is not a valid implementation for the wren reallocation function

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The behavior of realloc for size == 0 is implementation defined.
It can return a non NULL pointer which must not be dereferenced but nether
the less must be freed. When calling the wren reallocation function with
size == 0 the memory pointed to ptr must be freed and NULL returned.
This commit is contained in:
André Althaus
2015-06-02 20:57:41 +02:00
parent d66556b713
commit 0add2195f3
1 changed files with 17 additions and 1 deletions
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18
src/vm/wren_vm.c
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@ -22,9 +22,25 @@
#include <time.h>
#endif
static void* defaultReallocate(void* ptr, size_t new_size)
{
// The behavior of realloc for size == 0 is implementation defined.
// It can return a non NULL pointer which must not be dereferenced but nether
// the less must be freed. When calling the wren reallocation function with
// size == 0 the memory pointed to ptr must be freed and NULL returned.
if (ptr == NULL && new_size == 0) return NULL;
if (ptr != NULL && new_size == 0)
{
free(ptr);
return NULL;
}
return realloc(ptr, new_size);
}
WrenVM* wrenNewVM(WrenConfiguration* configuration)
{
WrenReallocateFn reallocate = realloc;
WrenReallocateFn reallocate = defaultReallocate;
if (configuration->reallocateFn != NULL)
{
reallocate = configuration->reallocateFn;