1/* xmalloc.c -- malloc with out of memory checking 2 3 Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 4 1999, 2000, 2002, 2003, 2004, 2005, 2006 Free Software Foundation, 5 Inc. 6 7 This program is free software: you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 19 20#include <config.h> 21 22#if ! HAVE_INLINE 23# define static_inline 24#endif 25#include "xalloc.h" 26#undef static_inline 27 28#include <stdlib.h> 29#include <string.h> 30 31#ifndef SIZE_MAX 32# define SIZE_MAX ((size_t) -1) 33#endif 34 35/* 1 if calloc is known to be compatible with GNU calloc. This 36 matters if we are not also using the calloc module, which defines 37 HAVE_CALLOC and supports the GNU API even on non-GNU platforms. */ 38#if defined HAVE_CALLOC || defined __GLIBC__ 39enum { HAVE_GNU_CALLOC = 1 }; 40#else 41enum { HAVE_GNU_CALLOC = 0 }; 42#endif 43 44/* Allocate N bytes of memory dynamically, with error checking. */ 45 46void * 47xmalloc (size_t n) 48{ 49 void *p = malloc (n); 50 if (!p && n != 0) 51 xalloc_die (); 52 return p; 53} 54 55/* Change the size of an allocated block of memory P to N bytes, 56 with error checking. */ 57 58void * 59xrealloc (void *p, size_t n) 60{ 61 p = realloc (p, n); 62 if (!p && n != 0) 63 xalloc_die (); 64 return p; 65} 66 67/* If P is null, allocate a block of at least *PN bytes; otherwise, 68 reallocate P so that it contains more than *PN bytes. *PN must be 69 nonzero unless P is null. Set *PN to the new block's size, and 70 return the pointer to the new block. *PN is never set to zero, and 71 the returned pointer is never null. */ 72 73void * 74x2realloc (void *p, size_t *pn) 75{ 76 return x2nrealloc (p, pn, 1); 77} 78 79/* Allocate S bytes of zeroed memory dynamically, with error checking. 80 There's no need for xnzalloc (N, S), since it would be equivalent 81 to xcalloc (N, S). */ 82 83void * 84xzalloc (size_t s) 85{ 86 return memset (xmalloc (s), 0, s); 87} 88 89/* Allocate zeroed memory for N elements of S bytes, with error 90 checking. S must be nonzero. */ 91 92void * 93xcalloc (size_t n, size_t s) 94{ 95 void *p; 96 /* Test for overflow, since some calloc implementations don't have 97 proper overflow checks. But omit overflow and size-zero tests if 98 HAVE_GNU_CALLOC, since GNU calloc catches overflow and never 99 returns NULL if successful. */ 100 if ((! HAVE_GNU_CALLOC && xalloc_oversized (n, s)) 101 || (! (p = calloc (n, s)) && (HAVE_GNU_CALLOC || n != 0))) 102 xalloc_die (); 103 return p; 104} 105 106/* Clone an object P of size S, with error checking. There's no need 107 for xnmemdup (P, N, S), since xmemdup (P, N * S) works without any 108 need for an arithmetic overflow check. */ 109 110void * 111xmemdup (void const *p, size_t s) 112{ 113 return memcpy (xmalloc (s), p, s); 114} 115 116/* Clone STRING. */ 117 118char * 119xstrdup (char const *string) 120{ 121 return xmemdup (string, strlen (string) + 1); 122} 123