1 /* Memory allocation with expensive empty allocations.
2 Copyright (C) 2003, 2008, 2010-2020 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 <https://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
42 #if ! defined __clang__ && \
43 (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3))
44 # define _GL_ATTRIBUTE_ALLOC_SIZE(args) __attribute__ ((__alloc_size__ args))
46 # define _GL_ATTRIBUTE_ALLOC_SIZE(args)
49 #if MALLOC_0_IS_NONNULL
50 # define eemalloc malloc
52 EEALLOC_INLINE
void *eemalloc (size_t n
)
53 _GL_ATTRIBUTE_MALLOC
_GL_ATTRIBUTE_ALLOC_SIZE ((1));
57 /* If n is zero, allocate a 1-byte block. */
64 #if REALLOC_0_IS_NONNULL
65 # define eerealloc realloc
67 EEALLOC_INLINE
void *eerealloc (void *p
, size_t n
)
68 _GL_ATTRIBUTE_ALLOC_SIZE ((2));
70 eerealloc (void *p
, size_t n
)
72 /* If n is zero, allocate or keep a 1-byte block. */
75 return realloc (p
, n
);
79 /* Maybe we should also define variants
80 eenmalloc (size_t n, size_t s) - behaves like eemalloc (n * s)
81 eezalloc (size_t n) - like eemalloc followed by memset 0
82 eecalloc (size_t n, size_t s) - like eemalloc (n * s) followed by memset 0
83 eenrealloc (void *p, size_t n, size_t s) - like eerealloc (p, n * s)
84 If this would be useful in your application. please speak up. */
88 #endif /* _EEALLOC_H */