readline/xfree.c

   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 }