gfx/harfbuzz/src/failing-alloc.c

   1 /*
   2  * Copyright © 2020  Ebrahim Byagowi
   3  *
   4  *  This is part of HarfBuzz, a text shaping library.
   5  *
   6  * Permission is hereby granted, without written agreement and without
   7  * license or royalty fees, to use, copy, modify, and distribute this
   8  * software and its documentation for any purpose, provided that the
   9  * above copyright notice and the following two paragraphs appear in
  10  * all copies of this software.
  11  *
  12  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
  13  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
  14  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
  15  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
  16  * DAMAGE.
  17  *
  18  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
  19  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
  20  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
  21  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
  22  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
  23  */
  24
  25 #include <stdlib.h>
  26 #include <stdio.h>
  27
  28 #ifdef __cplusplus
  29 extern "C" {
  30 #endif
  31
  32 int alloc_state = 0;
  33
  34 __attribute__((no_sanitize("integer")))
  35 static int fastrand ()
  36 {
  37   if (!alloc_state) return 1;
  38   /* Based on https://software.intel.com/content/www/us/en/develop/articles/fast-random-number-generator-on-the-intel-pentiumr-4-processor.html */
  39   alloc_state = (214013 * alloc_state + 2531011);
  40   return (alloc_state >> 16) & 0x7FFF;
  41 }
  42
  43 void* hb_malloc_impl (size_t size)
  44 {
  45   return (fastrand () % 16) ? malloc (size) : NULL;
  46 }
  47
  48 void* hb_calloc_impl (size_t nmemb, size_t size)
  49 {
  50   return (fastrand () % 16) ? calloc (nmemb, size) : NULL;
  51 }
  52
  53 void* hb_realloc_impl (void *ptr, size_t size)
  54 {
  55   return (fastrand () % 16) ? realloc (ptr, size) : NULL;
  56 }
  57
  58 void  hb_free_impl (void *ptr)
  59 {
  60   return free (ptr);
  61 }
  62
  63 #ifdef __cplusplus
  64 }
  65 #endif