| realloc | Function* (tigcc.a)

alloc.h, stdlib.h

void *realloc (void *Ptr, unsigned long NewSize);

Reallocates allocated memory.

realloc attempts to shrink or expand the previously allocated block to NewSize bytes. The Ptr argument points to a memory block previously obtained by calling malloc, calloc, or realloc. It may also be NULL; in this case the function simply calls malloc.
realloc adjusts the size of the allocated block to NewSize, copying the contents to a new location if necessary (note that the block will not stay in high memory after the reallocation, but it will still remain locked; see other functions from this header file for more info). realloc returns the address of the reallocated block, which can be different than the address of the original block. If the block cannot be reallocated, realloc returns NULL.
Usually realloc keeps the current contents of the block intact; only the portion of the block which is newly allocated is not initialized and contains random content. However, unlike HeapRealloc, the function frees the block pointed to by Ptr if there was an error, so you can not assume that the data pointed to by Ptr is still valid. This is done because there is no way to guarantee that Ptr is still valid after the heap compression which HeapRealloc tries to perform (this function uses HeapRealloc internally).
Note: realloc is introduced to increase compatibility with ANSI C. It is better to use the official TIOS function HeapRealloc, which uses a system of handles to memory blocks.

Uses: HeapAllocPtr, HeapFree, HeapRealloc, HeapUnlock, HLock
Used by: realloc_throw, atexit

See also: malloc, calloc, free, realloc_throw