usr.sbin/makefs: Add -o c|C option to specify comp|check type
[dragonfly.git] / contrib / cvs-1.12 / lib / xalloc.h
blobf80977e309ef96823070482c48170b6d657b0655
1 /* xalloc.h -- malloc with out-of-memory checking
3 Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
4 1999, 2000, 2003, 2004 Free Software Foundation, Inc.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
9 any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software Foundation,
18 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
20 #ifndef XALLOC_H_
21 # define XALLOC_H_
23 # include <stddef.h>
26 # ifdef __cplusplus
27 extern "C" {
28 # endif
31 # ifndef __attribute__
32 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || __STRICT_ANSI__
33 # define __attribute__(x)
34 # endif
35 # endif
37 # ifndef ATTRIBUTE_NORETURN
38 # define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
39 # endif
41 /* This function is always triggered when memory is exhausted.
42 It must be defined by the application, either explicitly
43 or by using gnulib's xalloc-die module. This is the
44 function to call when one wants the program to die because of a
45 memory allocation failure. */
46 extern void xalloc_die (void) ATTRIBUTE_NORETURN;
48 void *xmalloc (size_t s);
49 void *xnmalloc (size_t n, size_t s);
50 void *xzalloc (size_t s);
51 void *xcalloc (size_t n, size_t s);
52 void *xrealloc (void *p, size_t s);
53 void *xnrealloc (void *p, size_t n, size_t s);
54 void *x2realloc (void *p, size_t *pn);
55 void *x2nrealloc (void *p, size_t *pn, size_t s);
56 void *xmemdup (void const *p, size_t s);
57 char *xstrdup (char const *str);
59 /* Return 1 if an array of N objects, each of size S, cannot exist due
60 to size arithmetic overflow. S must be positive and N must be
61 nonnegative. This is a macro, not an inline function, so that it
62 works correctly even when SIZE_MAX < N.
64 By gnulib convention, SIZE_MAX represents overflow in size
65 calculations, so the conservative dividend to use here is
66 SIZE_MAX - 1, since SIZE_MAX might represent an overflowed value.
67 However, malloc (SIZE_MAX) fails on all known hosts where
68 sizeof (ptrdiff_t) <= sizeof (size_t), so do not bother to test for
69 exactly-SIZE_MAX allocations on such hosts; this avoids a test and
70 branch when S is known to be 1. */
71 # define xalloc_oversized(n, s) \
72 ((size_t) (sizeof (ptrdiff_t) <= sizeof (size_t) ? -1 : -2) / (s) < (n))
74 # ifdef __cplusplus
76 # endif
79 #endif /* !XALLOC_H_ */