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79 lines
2.1 KiB
79 lines
2.1 KiB
/* realloc() function that is glibc compatible. |
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Copyright (C) 1997, 2003-2004, 2006-2007, 2009-2012 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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#define _GL_USE_STDLIB_ALLOC 1 |
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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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#include <stdlib.h> |
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#include <errno.h> |
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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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