failing-alloc.c (1908B)
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