kc3-lang/harfbuzz/src/failing-alloc.c

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• Hash : c33e8006
  Author :
  Date : 2020-07-14T19:29:58
  

  [fuzz] Implement failing allocator
  

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• src/failing-alloc.c

• /*
   * Copyright © 2020  Ebrahim Byagowi
   *
   *  This is part of HarfBuzz, a text shaping library.
   *
   * Permission is hereby granted, without written agreement and without
   * license or royalty fees, to use, copy, modify, and distribute this
   * software and its documentation for any purpose, provided that the
   * above copyright notice and the following two paragraphs appear in
   * all copies of this software.
   *
   * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
   * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
   * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
   * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
   * DAMAGE.
   *
   * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
   * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
   * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
   * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
   * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
   */
  
  #include <stdlib.h>
  #include <stdio.h>
  
  int alloc_state = 0;
  
  __attribute__((no_sanitize("integer")))
  static int fastrand ()
  {
    if (!alloc_state) return 1;
    /* Based on https://software.intel.com/content/www/us/en/develop/articles/fast-random-number-generator-on-the-intel-pentiumr-4-processor.html */
    alloc_state = (214013 * alloc_state + 2531011);
    return (alloc_state >> 16) & 0x7FFF;
  }
  
  void* hb_malloc_impl (size_t size)
  {
    return (fastrand () % 16) ? malloc (size) : NULL;
  }
  
  void* hb_calloc_impl (size_t nmemb, size_t size)
  {
    return (fastrand () % 16) ? calloc (nmemb, size) : NULL;
  }
  
  void* hb_realloc_impl (void *ptr, size_t size)
  {
    return (fastrand () % 16) ? realloc (ptr, size) : NULL;
  }
  
  void  hb_free_impl (void *ptr)
  {
    return free (ptr);
  }
  

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