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| 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 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__ |
| 39 enum { HAVE_GNU_CALLOC = 1 }; |
| 40 #else |
| 41 enum { HAVE_GNU_CALLOC = 0 }; |
| 42 #endif |
| 43 |
| 44 /* Allocate N bytes of memory dynamically, with error checking. */ |
| 45 |
| 46 void * |
| 47 xmalloc (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 |
| 58 void * |
| 59 xrealloc (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 |
| 73 void * |
| 74 x2realloc (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 |
| 83 void * |
| 84 xzalloc (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 |
| 92 void * |
| 93 xcalloc (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 |
| 110 void * |
| 111 xmemdup (void const *p, size_t s) |
| 112 { |
| 113 return memcpy (xmalloc (s), p, s); |
| 114 } |
| 115 |
| 116 /* Clone STRING. */ |
| 117 |
| 118 char * |
| 119 xstrdup (char const *string) |
| 120 { |
| 121 return xmemdup (string, strlen (string) + 1); |
| 122 } |
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