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comparison lib/xmalloc.c @ 272:d5392bb5da3c 2.5
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date | Sun, 16 Aug 2009 17:16:49 +0000 |
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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 } |