/*
* realloc - Change the size of the block by mallocing a new block,
* copying its data, and freeing the old block. I'm too lazy
* to do better.
*/
void *realloc(void *oldptr, size_t size)
{
size_t oldsize;
void *newptr;
/* If size == 0 then this is just free, and we return NULL. */
if(size == 0) {
free(oldptr);
return 0;
}
/* If oldptr is NULL, then this is just malloc. */
if(oldptr == NULL) {
return malloc(size);
}
newptr = malloc(size);
/* If realloc() fails the original block is left untouched */
if(!newptr) {
return 0;
}
/* Copy the old data. */
oldsize = *SIZE_PTR(oldptr);
if(size < oldsize) oldsize = size;
memcpy(newptr, oldptr, oldsize);
/* Free the old block. */
free(oldptr);
return newptr;
}
/*
* malloc - Allocate a block by incrementing the brk pointer.
* Always allocate a block whose size is a multiple of the alignment.
*/
void *malloc(size_t size){
int newsize = ALIGN(size + SIZE_T_SIZE);
unsigned char *p = mem_sbrk(newsize);
//dbg_printf("malloc %u => %p\n", size, p);
if ((long)p < 0)
return NULL;
else {
p += SIZE_T_SIZE;
*SIZE_PTR(p) = size;
return p;
}
}
/*
* malloc
*/
void *malloc(size_t size)
{
int newsize = ALIGN(size + SIZE_T_SIZE);
unsigned char *p = mem_sbrk(newsize);
if( (long)p < 0 )
return NULL;
else
{
p += SIZE_T_SIZE;
*SIZE_PTR(p) = newsize;
return p;
}
}
