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[cc65] / libsrc / common / realloc.c

diff --git a/libsrc/common/realloc.c b/libsrc/common/realloc.c
index 32c05f46f8dbac520051accea1e41b6c6077ef4f..6c4f40a6c2d577e30e0f429425902c6bb619f4bc 100644 (file)
--- a/libsrc/common/realloc.c
+++ b/libsrc/common/realloc.c
@@ -1,8 +1,35 @@
-/*
- * realloc.c
- *
- * Ullrich von Bassewitz, 06.06.1998
- */
+/*****************************************************************************/
+/*                                                                           */
+/*                                 realloc.c                                 */
+/*                                                                           */
+/*               Change the size of an allocated memory block                */
+/*                                                                           */
+/*                                                                           */
+/*                                                                           */
+/* (C) 1998-2002 Ullrich von Bassewitz                                       */
+/*               Wacholderweg 14                                             */
+/*               D-70597 Stuttgart                                           */
+/* EMail:        uz@musoftware.de                                            */
+/*                                                                           */
+/*                                                                           */
+/* This software is provided 'as-is', without any expressed or implied       */
+/* warranty.  In no event will the authors be held liable for any damages    */
+/* arising from the use of this software.                                    */
+/*                                                                           */
+/* Permission is granted to anyone to use this software for any purpose,     */
+/* including commercial applications, and to alter it and redistribute it    */
+/* freely, subject to the following restrictions:                            */
+/*                                                                           */
+/* 1. The origin of this software must not be misrepresented; you must not   */
+/*    claim that you wrote the original software. If you use this software   */
+/*    in a product, an acknowledgment in the product documentation would be  */
+/*    appreciated but is not required.                                       */
+/* 2. Altered source versions must be plainly marked as such, and must not   */
+/*    be misrepresented as being the original software.                      */
+/* 3. This notice may not be removed or altered from any source              */
+/*    distribution.                                                          */
+/*                                                                           */
+/*****************************************************************************/
 
 
 
@@ -12,7 +39,7 @@
 
 
 
-void* realloc (void* block, size_t size)
+void* __fastcall__ realloc (void* block, size_t size)
 {
     unsigned* b;
     unsigned* newblock;
@@ -62,7 +89,19 @@ void* realloc (void* block, size_t size)
      * room left. Try to allocate a new block and copy the data.
      */
     if (newblock = malloc (size)) {
-       memcpy (newblock, block, oldsize - 2);
+
+       /* Adjust the old size to the user visible portion */
+       oldsize -= sizeof (unsigned);
+
+       /* If the new block is larger than the old one, copy the old
+        * data only
+        */
+       if (size > oldsize) {
+           size = oldsize;
+       }
+
+       /* Copy the block data */
+       memcpy (newblock, block, size);
        free (block);
     }
     return newblock;
@@ -70,9 +109,3 @@ void* realloc (void* block, size_t size)
 
 
 
-
-
-
-
-
-