newlib/libc/machine/nvptx/realloc.c

   1 /*
   2  * Support file for nvptx in newlib.
   3  * Copyright (c) 2016-2018 Mentor Graphics.
   4  *
   5  * The authors hereby grant permission to use, copy, modify, distribute,
   6  * and license this software and its documentation for any purpose, provided
   7  * that existing copyright notices are retained in all copies and that this
   8  * notice is included verbatim in any distributions. No written agreement,
   9  * license, or royalty fee is required for any of the authorized uses.
  10  * Modifications to this software may be copyrighted by their authors
  11  * and need not follow the licensing terms described here, provided that
  12  * the new terms are clearly indicated on the first page of each file where
  13  * they apply.
  14  */
  15
  16 #include <stdlib.h>
  17
  18 void *
  19 realloc (void *old_ptr, size_t new_size)
  20 {
  21   void *new_ptr = malloc (new_size);
  22
  23   if (old_ptr && new_ptr)
  24     {
  25       size_t old_size = *(size_t *)((long long *)old_ptr - 1);
  26       size_t copy_size = old_size > new_size ? new_size : old_size;
  27       __builtin_memcpy (new_ptr, old_ptr, copy_size);
  28       free (old_ptr);
  29     }
  30
  31   return new_ptr;
  32 }