1 /* Memory allocation with expensive empty allocations.
2 Copyright (C) 2003 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 2, or (at your option)
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. */
23 /* malloc() and realloc() are allowed to return NULL when asked to allocate
24 a memory block of 0 bytes; this is not an out-of-memory condition.
25 (See ISO C 99 section 7.20.3.) In some places, this is not welcome,
26 because it requires extra checking (so as not to confuse a zero-sized
27 allocation with an out-of-memory condition). This file provides
28 malloc()/realloc() workalikes which return non-NULL pointers for
29 succeeding zero-sized allocations. GNU libc already defines malloc()
30 and realloc() this way; on such platforms the workalikes are aliased
31 to the original malloc()/realloc() functions. */
35 #if MALLOC_0_IS_NONNULL
36 # define eemalloc malloc
41 /* If n is zero, allocate a 1-byte block. */
48 #if REALLOC_0_IS_NONNULL
49 # define eerealloc realloc
52 eerealloc (void *p, size_t n)
54 /* If n is zero, allocate or keep a 1-byte block. */
57 return realloc (p, n);
61 /* Maybe we should also define variants
62 eenmalloc (size_t n, size_t s) - behaves like eemalloc (n * s)
63 eezalloc (size_t n) - like eemalloc followed by memset 0
64 eecalloc (size_t n, size_t s) - like eemalloc (n * s) followed by memset 0
65 eenrealloc (void *p, size_t n, size_t s) - like eerealloc (p, n * s)
66 If this would be useful in your application. please speak up. */
68 #endif /* _EEALLOC_H */