| /* realloc() function that is glibc compatible. |
| |
| Copyright (C) 1997, 2003-2004, 2006-2007, 2009-2019 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 <https://www.gnu.org/licenses/>. */ |
| |
| /* written by Jim Meyering and Bruno Haible */ |
| |
| #define _GL_USE_STDLIB_ALLOC 1 |
| #include <config.h> |
| |
| /* Only the AC_FUNC_REALLOC macro defines 'realloc' already in config.h. */ |
| #ifdef realloc |
| # define NEED_REALLOC_GNU 1 |
| /* Whereas the gnulib module 'realloc-gnu' defines HAVE_REALLOC_GNU. */ |
| #elif GNULIB_REALLOC_GNU && !HAVE_REALLOC_GNU |
| # define NEED_REALLOC_GNU 1 |
| #endif |
| |
| /* Infer the properties of the system's malloc function. |
| The gnulib module 'malloc-gnu' defines HAVE_MALLOC_GNU. */ |
| #if GNULIB_MALLOC_GNU && HAVE_MALLOC_GNU |
| # define SYSTEM_MALLOC_GLIBC_COMPATIBLE 1 |
| #endif |
| |
| #include <stdlib.h> |
| |
| #include <errno.h> |
| |
| /* 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; |
| } |