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/* Memory allocation with expensive empty allocations.
Copyright (C) 2003, 2008 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2003,
based on prior work by Jim Meyering.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef _EEALLOC_H
#define _EEALLOC_H
/* malloc() and realloc() are allowed to return NULL when asked to allocate
a memory block of 0 bytes; this is not an out-of-memory condition.
(See ISO C 99 section 7.20.3.) In some places, this is not welcome,
because it requires extra checking (so as not to confuse a zero-sized
allocation with an out-of-memory condition). This file provides
malloc()/realloc() workalikes which return non-NULL pointers for
succeeding zero-sized allocations. GNU libc already defines malloc()
and realloc() this way; on such platforms the workalikes are aliased
to the original malloc()/realloc() functions. */
#include <stdlib.h>
#if MALLOC_0_IS_NONNULL
# define eemalloc malloc
#else
# if __GNUC__ >= 3
static inline void *eemalloc (size_t n) __attribute__ ((__malloc__));
# endif
static inline void *
eemalloc (size_t n)
{
/* If n is zero, allocate a 1-byte block. */
if (n == 0)
n = 1;
return malloc (n);
}
#endif
#if REALLOC_0_IS_NONNULL
# define eerealloc realloc
#else
static inline void *
eerealloc (void *p, size_t n)
{
/* If n is zero, allocate or keep a 1-byte block. */
if (n == 0)
n = 1;
return realloc (p, n);
}
#endif
/* Maybe we should also define variants
eenmalloc (size_t n, size_t s) - behaves like eemalloc (n * s)
eezalloc (size_t n) - like eemalloc followed by memset 0
eecalloc (size_t n, size_t s) - like eemalloc (n * s) followed by memset 0
eenrealloc (void *p, size_t n, size_t s) - like eerealloc (p, n * s)
If this would be useful in your application. please speak up. */
#endif /* _EEALLOC_H */
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