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/*
* realloc.c
*/
#include <stdlib.h>
#include <string.h>
#include "malloc.h"
/* FIXME: This is cheesy, it should be fixed later */
void *realloc(void *ptr, size_t size)
{
struct free_arena_header *ah;
void *newptr;
size_t oldsize;
if ( !ptr )
return malloc(size);
if ( size == 0 ) {
free(ptr);
return NULL;
}
/* Add the obligatory arena header, and round up */
size = (size+2*sizeof(struct arena_header)-1) & ARENA_SIZE_MASK;
ah = (struct free_arena_header *)
((struct arena_header *)ptr - 1);
if ( ah->a.size >= size && size >= (ah->a.size >> 2) ) {
/* This field is a good size already. */
return ptr;
} else {
/* Make me a new block. This is kind of bogus; we should
be checking the adjacent blocks to see if we can do an
in-place adjustment... fix that later. */
oldsize = ah->a.size - sizeof(struct arena_header);
newptr = malloc(size);
memcpy(newptr, ptr, (size < oldsize) ? size : oldsize);
free(ptr);
return newptr;
}
}
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