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 2, or (at your option) 10 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, write to the Free Software Foundation, 19 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ 20 21 #include <config.h> 22 23 #if ! HAVE_INLINE 24 # define static_inline 25 #endif 26 #include "xalloc.h" 27 #undef static_inline 28 29 #include <stdlib.h> 30 #include <string.h> 31 32 #ifndef SIZE_MAX 33 # define SIZE_MAX ((size_t) -1) 34 #endif 35 36 /* 1 if calloc is known to be compatible with GNU calloc. This 37 matters if we are not also using the calloc module, which defines 38 HAVE_CALLOC and supports the GNU API even on non-GNU platforms. */ 39 #if defined HAVE_CALLOC || defined __GLIBC__ 40 enum { HAVE_GNU_CALLOC = 1 }; 41 #else 42 enum { HAVE_GNU_CALLOC = 0 }; 43 #endif 44 45 /* Allocate N bytes of memory dynamically, with error checking. */ 46 47 void * 48 xmalloc (size_t n) 49 { 50 void *p = malloc (n); 51 if (!p && n != 0) 52 xalloc_die (); 53 return p; 54 } 55 56 /* Change the size of an allocated block of memory P to N bytes, 57 with error checking. */ 58 59 void * 60 xrealloc (void *p, size_t n) 61 { 62 p = realloc (p, n); 63 if (!p && n != 0) 64 xalloc_die (); 65 return p; 66 } 67 68 /* If P is null, allocate a block of at least *PN bytes; otherwise, 69 reallocate P so that it contains more than *PN bytes. *PN must be 70 nonzero unless P is null. Set *PN to the new block's size, and 71 return the pointer to the new block. *PN is never set to zero, and 72 the returned pointer is never null. */ 73 74 void * 75 x2realloc (void *p, size_t *pn) 76 { 77 return x2nrealloc (p, pn, 1); 78 } 79 80 /* Allocate S bytes of zeroed memory dynamically, with error checking. 81 There's no need for xnzalloc (N, S), since it would be equivalent 82 to xcalloc (N, S). */ 83 84 void * 85 xzalloc (size_t s) 86 { 87 return memset (xmalloc (s), 0, s); 88 } 89 90 /* Allocate zeroed memory for N elements of S bytes, with error 91 checking. S must be nonzero. */ 92 93 void * 94 xcalloc (size_t n, size_t s) 95 { 96 void *p; 97 /* Test for overflow, since some calloc implementations don't have 98 proper overflow checks. But omit overflow and size-zero tests if 99 HAVE_GNU_CALLOC, since GNU calloc catches overflow and never 100 returns NULL if successful. */ 101 if ((! HAVE_GNU_CALLOC && xalloc_oversized (n, s)) 102 || (! (p = calloc (n, s)) && (HAVE_GNU_CALLOC || n != 0))) 103 xalloc_die (); 104 return p; 105 } 106 107 /* Clone an object P of size S, with error checking. There's no need 108 for xnmemdup (P, N, S), since xmemdup (P, N * S) works without any 109 need for an arithmetic overflow check. */ 110 111 void * 112 xmemdup (void const *p, size_t s) 113 { 114 return memcpy (xmalloc (s), p, s); 115 } 116 117 /* Clone STRING. */ 118 119 char * 120 xstrdup (char const *string) 121 { 122 return xmemdup (string, strlen (string) + 1); 123 }