1 /* Memory allocation with expensive empty allocations.
2 Copyright (C) 2003, 2008, 2010-2017 Free Software Foundation, Inc.
3 Written by Bruno Haible <bruno@clisp.org>, 2003,
4 based on prior work by Jim Meyering.
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 3 of the License, or
9 (at your option) 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, see <http://www.gnu.org/licenses/>. */
22 /* malloc() and realloc() are allowed to return NULL when asked to allocate
23 a memory block of 0 bytes; this is not an out-of-memory condition.
24 (See ISO C 99 section 7.20.3.) In some places, this is not welcome,
25 because it requires extra checking (so as not to confuse a zero-sized
26 allocation with an out-of-memory condition). This file provides
27 malloc()/realloc() workalikes which return non-NULL pointers for
28 succeeding zero-sized allocations. GNU libc already defines malloc()
29 and realloc() this way; on such platforms the workalikes are aliased
30 to the original malloc()/realloc() functions. */
34 #ifndef _GL_INLINE_HEADER_BEGIN
35 #error "Please include config.h first."
37 _GL_INLINE_HEADER_BEGIN
38 #ifndef EEALLOC_INLINE
39 # define EEALLOC_INLINE _GL_INLINE
43 # define _GL_ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
45 # define _GL_ATTRIBUTE_MALLOC
48 #if ! defined __clang__ && \
49 (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3))
50 # define _GL_ATTRIBUTE_ALLOC_SIZE(args) __attribute__ ((__alloc_size__ args))
52 # define _GL_ATTRIBUTE_ALLOC_SIZE(args)
55 #if MALLOC_0_IS_NONNULL
56 # define eemalloc malloc
58 EEALLOC_INLINE
void *eemalloc (size_t n
)
59 _GL_ATTRIBUTE_MALLOC
_GL_ATTRIBUTE_ALLOC_SIZE ((1));
63 /* If n is zero, allocate a 1-byte block. */
70 #if REALLOC_0_IS_NONNULL
71 # define eerealloc realloc
73 EEALLOC_INLINE
void *eerealloc (void *p
, size_t n
)
74 _GL_ATTRIBUTE_ALLOC_SIZE ((2));
76 eerealloc (void *p
, size_t n
)
78 /* If n is zero, allocate or keep a 1-byte block. */
81 return realloc (p
, n
);
85 /* Maybe we should also define variants
86 eenmalloc (size_t n, size_t s) - behaves like eemalloc (n * s)
87 eezalloc (size_t n) - like eemalloc followed by memset 0
88 eecalloc (size_t n, size_t s) - like eemalloc (n * s) followed by memset 0
89 eenrealloc (void *p, size_t n, size_t s) - like eerealloc (p, n * s)
90 If this would be useful in your application. please speak up. */
94 #endif /* _EEALLOC_H */