1 /* realloc() function that is glibc compatible. 2 3 Copyright (C) 1997, 2003-2004, 2006-2007, 2009-2012 Free Software 4 Foundation, Inc. 5 6 This program is free software: you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3 of the License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 18 19 /* written by Jim Meyering and Bruno Haible */ 20 21 #define _GL_USE_STDLIB_ALLOC 1 22 #include <config.h> 23 24 /* Only the AC_FUNC_REALLOC macro defines 'realloc' already in config.h. */ 25 #ifdef realloc 26 # define NEED_REALLOC_GNU 1 27 /* Whereas the gnulib module 'realloc-gnu' defines HAVE_REALLOC_GNU. */ 28 #elif GNULIB_REALLOC_GNU && !HAVE_REALLOC_GNU 29 # define NEED_REALLOC_GNU 1 30 #endif 31 32 /* Infer the properties of the system's malloc function. 33 The gnulib module 'malloc-gnu' defines HAVE_MALLOC_GNU. */ 34 #if GNULIB_MALLOC_GNU && HAVE_MALLOC_GNU 35 # define SYSTEM_MALLOC_GLIBC_COMPATIBLE 1 36 #endif 37 38 #include <stdlib.h> 39 40 #include <errno.h> 41 42 /* Change the size of an allocated block of memory P to N bytes, 43 with error checking. If N is zero, change it to 1. If P is NULL, 44 use malloc. */ 45 46 void * 47 rpl_realloc (void *p, size_t n) 48 { 49 void *result; 50 51 #if NEED_REALLOC_GNU 52 if (n == 0) 53 { 54 n = 1; 55 56 /* In theory realloc might fail, so don't rely on it to free. */ 57 free (p); 58 p = NULL; 59 } 60 #endif 61 62 if (p == NULL) 63 { 64 #if GNULIB_REALLOC_GNU && !NEED_REALLOC_GNU && !SYSTEM_MALLOC_GLIBC_COMPATIBLE 65 if (n == 0) 66 n = 1; 67 #endif 68 result = malloc (n); 69 } 70 else 71 result = realloc (p, n); 72 73 #if !HAVE_REALLOC_POSIX 74 if (result == NULL) 75 errno = ENOMEM; 76 #endif 77 78 return result; 79 } 80
