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/* realloc() function that is glibc compatible.
Copyright (C) 1997, 2003-2004, 2006-2007, 2009-2010 Free Software
Foundation, Inc.
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/>. */
/* written by Jim Meyering and Bruno Haible */
#include <config.h>
/* Only the AC_FUNC_REALLOC macro defines 'realloc' already in config.h. */
#ifdef realloc
# define NEED_REALLOC_GNU 1
#endif
/* Infer the properties of the system's malloc function.
Only the AC_FUNC_MALLOC macro defines 'malloc' already in config.h. */
#if GNULIB_MALLOC_GNU && !defined malloc
# define SYSTEM_MALLOC_GLIBC_COMPATIBLE 1
#endif
/* Below we want to call the system's malloc and realloc.
Undefine the symbols here so that including <stdlib.h> provides a
declaration of malloc(), not of rpl_malloc(), and likewise for realloc. */
#undef malloc
#undef realloc
/* Specification. */
#include <stdlib.h>
#include <errno.h>
/* Below we want to call the system's malloc and realloc.
Undefine the symbols, if they were defined by gnulib's <stdlib.h>
replacement. */
#undef malloc
#undef realloc
/* Change the size of an allocated block of memory P to N bytes,
with error checking. If N is zero, change it to 1. If P is NULL,
use malloc. */
void *
rpl_realloc (void *p, size_t n)
{
void *result;
#if NEED_REALLOC_GNU
if (n == 0)
{
n = 1;
/* In theory realloc might fail, so don't rely on it to free. */
free (p);
p = NULL;
}
#endif
if (p == NULL)
{
#if GNULIB_REALLOC_GNU && !NEED_REALLOC_GNU && !SYSTEM_MALLOC_GLIBC_COMPATIBLE
if (n == 0)
n = 1;
#endif
result = malloc (n);
}
else
result = realloc (p, n);
#if !HAVE_REALLOC_POSIX
if (result == NULL)
errno = ENOMEM;
#endif
return result;
}
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