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, 2008-2009 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 /* 1 if calloc is known to be compatible with GNU calloc. This 32 matters if we are not also using the calloc module, which defines 33 HAVE_CALLOC and supports the GNU API even on non-GNU platforms. */ 34 #if defined HAVE_CALLOC || defined __GLIBC__ 35 enum { HAVE_GNU_CALLOC = 1 }; 36 #else 37 enum { HAVE_GNU_CALLOC = 0 }; 38 #endif 39 40 /* Allocate N bytes of memory dynamically, with error checking. */ 41 42 void * 43 xmalloc (size_t n) 44 { 45 void *p = malloc (n); 46 if (!p && n != 0) 47 xalloc_die (); 48 return p; 49 } 50 51 /* Change the size of an allocated block of memory P to N bytes, 52 with error checking. */ 53 54 void * 55 xrealloc (void *p, size_t n) 56 { 57 p = realloc (p, n); 58 if (!p && n != 0) 59 xalloc_die (); 60 return p; 61 } 62 63 /* If P is null, allocate a block of at least *PN bytes; otherwise, 64 reallocate P so that it contains more than *PN bytes. *PN must be 65 nonzero unless P is null. Set *PN to the new block's size, and 66 return the pointer to the new block. *PN is never set to zero, and 67 the returned pointer is never null. */ 68 69 void * 70 x2realloc (void *p, size_t *pn) 71 { 72 return x2nrealloc (p, pn, 1); 73 } 74 75 /* Allocate S bytes of zeroed memory dynamically, with error checking. 76 There's no need for xnzalloc (N, S), since it would be equivalent 77 to xcalloc (N, S). */ 78 79 void * 80 xzalloc (size_t s) 81 { 82 return memset (xmalloc (s), 0, s); 83 } 84 85 /* Allocate zeroed memory for N elements of S bytes, with error 86 checking. S must be nonzero. */ 87 88 void * 89 xcalloc (size_t n, size_t s) 90 { 91 void *p; 92 /* Test for overflow, since some calloc implementations don't have 93 proper overflow checks. But omit overflow and size-zero tests if 94 HAVE_GNU_CALLOC, since GNU calloc catches overflow and never 95 returns NULL if successful. */ 96 if ((! HAVE_GNU_CALLOC && xalloc_oversized (n, s)) 97 || (! (p = calloc (n, s)) && (HAVE_GNU_CALLOC || n != 0))) 98 xalloc_die (); 99 return p; 100 } 101 102 /* Clone an object P of size S, with error checking. There's no need 103 for xnmemdup (P, N, S), since xmemdup (P, N * S) works without any 104 need for an arithmetic overflow check. */ 105 106 void * 107 xmemdup (void const *p, size_t s) 108 { 109 return memcpy (xmalloc (s), p, s); 110 } 111 112 /* Clone STRING. */ 113 114 char * 115 xstrdup (char const *string) 116 { 117 return xmemdup (string, strlen (string) + 1); 118 } 119
