1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
|
/* xmalloc.c -- malloc with out of memory checking
Copyright (C) 1990-2000, 2002-2006, 2008-2020 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
#define XALLOC_INLINE _GL_EXTERN_INLINE
#include "xalloc.h"
#include <stdlib.h>
#include <string.h>
/* 1 if calloc, malloc and realloc are known to be compatible with GNU.
This matters if we are not also using the calloc-gnu, malloc-gnu
and realloc-gnu modules, which define HAVE_CALLOC_GNU,
HAVE_MALLOC_GNU and HAVE_REALLOC_GNU and support the GNU API even
on non-GNU platforms. */
#if defined HAVE_CALLOC_GNU || (defined __GLIBC__ && !defined __UCLIBC__)
enum { HAVE_GNU_CALLOC = 1 };
#else
enum { HAVE_GNU_CALLOC = 0 };
#endif
#if defined HAVE_MALLOC_GNU || (defined __GLIBC__ && !defined __UCLIBC__)
enum { HAVE_GNU_MALLOC = 1 };
#else
enum { HAVE_GNU_MALLOC = 0 };
#endif
#if defined HAVE_REALLOC_GNU || (defined __GLIBC__ && !defined __UCLIBC__)
enum { HAVE_GNU_REALLOC = 1 };
#else
enum { HAVE_GNU_REALLOC = 0 };
#endif
/* Allocate N bytes of memory dynamically, with error checking. */
void *
xmalloc (size_t n)
{
void *p = malloc (n);
if (!p && (HAVE_GNU_MALLOC || n))
xalloc_die ();
return p;
}
/* Change the size of an allocated block of memory P to N bytes,
with error checking. */
void *
xrealloc (void *p, size_t n)
{
if (!HAVE_GNU_REALLOC && !n && p)
{
/* The GNU and C99 realloc behaviors disagree here. Act like GNU. */
free (p);
return NULL;
}
void *r = realloc (p, n);
if (!r && (n || (HAVE_GNU_REALLOC && !p)))
xalloc_die ();
return r;
}
/* If P is null, allocate a block of at least *PN bytes; otherwise,
reallocate P so that it contains more than *PN bytes. *PN must be
nonzero unless P is null. Set *PN to the new block's size, and
return the pointer to the new block. *PN is never set to zero, and
the returned pointer is never null. */
void *
x2realloc (void *p, size_t *pn)
{
return x2nrealloc (p, pn, 1);
}
/* Allocate N bytes of zeroed memory dynamically, with error checking.
There's no need for xnzalloc (N, S), since it would be equivalent
to xcalloc (N, S). */
void *
xzalloc (size_t n)
{
return xcalloc (n, 1);
}
/* Allocate zeroed memory for N elements of S bytes, with error
checking. S must be nonzero. */
void *
xcalloc (size_t n, size_t s)
{
void *p;
/* Test for overflow, since objects with size greater than
PTRDIFF_MAX cause pointer subtraction to go awry. Omit size-zero
tests if HAVE_GNU_CALLOC, since GNU calloc never returns NULL if
successful. */
if (xalloc_oversized (n, s)
|| (! (p = calloc (n, s)) && (HAVE_GNU_CALLOC || n != 0)))
xalloc_die ();
return p;
}
/* Clone an object P of size S, with error checking. There's no need
for xnmemdup (P, N, S), since xmemdup (P, N * S) works without any
need for an arithmetic overflow check. */
void *
xmemdup (void const *p, size_t s)
{
return memcpy (xmalloc (s), p, s);
}
/* Clone STRING. */
char *
xstrdup (char const *string)
{
return xmemdup (string, strlen (string) + 1);
}
|
