1 /* realloc() function that is glibc compatible. 2 3 Copyright (C) 1997, 2003-2004, 2006-2007, 2009-2021 Free Software 4 Foundation, Inc. 5 6 This file is free software: you can redistribute it and/or modify 7 it under the terms of the GNU Lesser General Public License as 8 published by the Free Software Foundation; either version 2.1 of the 9 License, or (at your option) any later version. 10 11 This file 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 Lesser General Public License for more details. 15 16 You should have received a copy of the GNU Lesser General Public License 17 along with this program. If not, see <https://www.gnu.org/licenses/>. */ 18 19 /* written by Jim Meyering and Bruno Haible */ 20 21 #include <config.h> 22 23 #include <stdlib.h> 24 25 #include <errno.h> 26 27 #include "xalloc-oversized.h" 28 29 /* Call the system's realloc below. This file does not define 30 _GL_USE_STDLIB_ALLOC because it needs Gnulib's malloc if present. */ 31 #undef realloc 32 33 /* Change the size of an allocated block of memory P to N bytes, 34 with error checking. If P is NULL, use malloc. Otherwise if N is zero, 35 free P and return NULL. */ 36 37 void * 38 rpl_realloc (void *p, size_t n) /* */ 39 { 40 if (p == NULL) 41 return malloc (n); 42 43 if (n == 0) 44 { 45 free (p); 46 return NULL; 47 } 48 49 if (xalloc_oversized (n, 1)) 50 { 51 errno = ENOMEM; 52 return NULL; 53 } 54 55 void *result = realloc (p, n); 56 57 #if !HAVE_MALLOC_POSIX 58 if (result == NULL) 59 errno = ENOMEM; 60 #endif 61 62 return result; 63 }