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