1 /* xfree.c -- safe version of free that ignores attempts to free NUL */ 2 3 /* Copyright (C) 1991-2010 Free Software Foundation, Inc. 4 5 This file is part of the GNU Readline Library (Readline), a library 6 for reading lines of text with interactive input and history editing. 7 8 Readline is free software: you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation, either version 3 of the License, or 11 (at your option) any later version. 12 13 Readline is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with Readline. If not, see <http://www.gnu.org/licenses/>. 20 */ 21 22 #define READLINE_LIBRARY 23 24 #if defined (HAVE_CONFIG_H) 25 #include <config.h> 26 #endif 27 28 #if defined (HAVE_STDLIB_H) 29 # include <stdlib.h> 30 #else 31 # include "ansi_stdlib.h" 32 #endif /* HAVE_STDLIB_H */ 33 34 #include <stdio.h> 35 36 #include "xmalloc.h" 37 #include "readline.h" 38 39 /* **************************************************************** */ 40 /* */ 41 /* Memory Deallocation. */ 42 /* */ 43 /* **************************************************************** */ 44 45 /* Use this as the function to call when adding unwind protects so we 46 don't need to know what free() returns. */ 47 void 48 xfree (string) 49 PTR_T string; 50 { 51 /* Leak a bit. */ 52 if (RL_ISSTATE(RL_STATE_SIGHANDLER)) 53 return; 54 55 if (string) 56 free (string); 57 } 58