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Paul Eggert
69 lines
2.4 KiB
C
69 lines
2.4 KiB
C
/* Memory allocation with expensive empty allocations.
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Copyright (C) 2003 Free Software Foundation, Inc.
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Written by Bruno Haible <bruno@clisp.org>, 2003,
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based on prior work by Jim Meyering.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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#ifndef _EEALLOC_H
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#define _EEALLOC_H
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/* malloc() and realloc() are allowed to return NULL when asked to allocate
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a memory block of 0 bytes; this is not an out-of-memory condition.
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(See ISO C 99 section 7.20.3.) In some places, this is not welcome,
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because it requires extra checking (so as not to confuse a zero-sized
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allocation with an out-of-memory condition). This file provides
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malloc()/realloc() workalikes which return non-NULL pointers for
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succeeding zero-sized allocations. GNU libc already defines malloc()
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and realloc() this way; on such platforms the workalikes are aliased
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to the original malloc()/realloc() functions. */
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#include <stdlib.h>
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#if MALLOC_0_IS_NONNULL
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# define eemalloc malloc
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#else
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static inline void *
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eemalloc (size_t n)
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{
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/* If n is zero, allocate a 1-byte block. */
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if (n == 0)
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n = 1;
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return malloc (n);
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}
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#endif
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#if REALLOC_0_IS_NONNULL
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# define eerealloc realloc
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#else
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static inline void *
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eerealloc (void *p, size_t n)
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{
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/* If n is zero, allocate or keep a 1-byte block. */
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if (n == 0)
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n = 1;
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return realloc (p, n);
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}
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#endif
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/* Maybe we should also define variants
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eenmalloc (size_t n, size_t s) - behaves like eemalloc (n * s)
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eezalloc (size_t n) - like eemalloc followed by memset 0
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eecalloc (size_t n, size_t s) - like eemalloc (n * s) followed by memset 0
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eenrealloc (void *p, size_t n, size_t s) - like eerealloc (p, n * s)
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If this would be useful in your application. please speak up. */
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#endif /* _EEALLOC_H */
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