1 files changed, 85 insertions, 0 deletions
diff --git a/private/crt32/winheap/realloc.c b/private/crt32/winheap/realloc.c
new file mode 100644
index 000000000..ac66611a4
--- /dev/null
+++ b/private/crt32/winheap/realloc.c
@@ -0,0 +1,85 @@
+/***
+*realloc.c - Win32 realloc heap routine
+*
+*	Copyright (c) 1991-1992, Microsoft Corporation.  All rights reserved.
+*
+*Purpose:
+*
+*Revision History:
+*	01-10-92  JCR	Module created.
+*	02-04-92  GJF	Replaced windows.h with oscalls.h.
+*	05-06-92  DJM	POSIX support.
+*	09-09-92  SRW	Fixed _POSIX_ to allow movement when growing.
+*	09-23-92  SRW	Change winheap code to call NT directly always
+*	10-28-92  SRW	Change winheap code to call Heap????Ex calls
+*	11-05-92  SKS	Change name of variable "CrtHeap" to "_crtheap"
+*	11-07-92  SRW   _NTIDW340 replaced by linkopts\betacmp.c
+*	11-16-92  SRW   Heap???Ex functions renamed to Heap???
+*
+*******************************************************************************/
+
+#include <cruntime.h>
+#include <malloc.h>
+#include <winheap.h>
+#include <oscalls.h>
+
+/***
+*void *realloc(void *pblock, size_t newsize) - reallocate a block of memory in
+*	the heap
+*
+*Purpose:
+*	Re-allocates a block in the heap to newsize bytes. newsize may be
+*	either greater or less than the original size of the block. The
+*	re-allocation may result in moving the block as well as changing
+*	the size. If the block is moved, the contents of the original block
+*	are copied over.
+*
+*	Special ANSI Requirements:
+*
+*	(1) realloc(NULL, newsize) is equivalent to malloc(newsize)
+*
+*	(2) realloc(pblock, 0) is equivalent to free(pblock) (except that
+*	    NULL is returned)
+*
+*	(3) if the realloc() fails, the object pointed to by pblock is left
+*	    unchanged
+*
+*Entry:
+*	void *pblock	- pointer to block in the heap previously allocated
+*			  by a call to malloc(), realloc() or _expand().
+*
+*	size_t newsize	- requested size for the re-allocated block
+*
+*Exit:
+*	Success:  Pointer to the re-allocated memory block
+*	Failure:  NULL
+*
+*Uses:
+*
+*Exceptions:
+*	If pblock does not point to a valid allocation block in the heap,
+*	realloc() will behave unpredictably and probably corrupt the heap.
+*
+*******************************************************************************/
+
+void * _CALLTYPE1 realloc(pblock, n)
+void * pblock;
+size_t	n;
+
+{
+  /* if ptr is NULL, call malloc */
+  if (pblock == (void *) NULL)
+	return(malloc(n));
+
+  /* if ptr is !NULL and size is 0, call free and return NULL */
+  if (n == 0) {
+	free(pblock);
+	return((void *) NULL);
+	}
+
+  return HeapReAlloc(_crtheap,
+                     0,
+                     pblock,
+                     n
+                    );
+}