joachim99@52: /* xmalloc.c -- malloc with out of memory checking
joachim99@52: 
joachim99@52:    Modified for KDiff3 by Joachim Eibl 2003.
joachim99@53:    The original file was part of GNU DIFF.
joachim99@52: 
joachim99@52:    Copyright (C) 1990-1999, 2000, 2002 Free Software Foundation, Inc.
joachim99@52: 
joachim99@52:    This program is free software; you can redistribute it and/or modify
joachim99@52:    it under the terms of the GNU General Public License as published by
joachim99@52:    the Free Software Foundation; either version 2, or (at your option)
joachim99@52:    any later version.
joachim99@52: 
joachim99@52:    This program is distributed in the hope that it will be useful,
joachim99@52:    but WITHOUT ANY WARRANTY; without even the implied warranty of
joachim99@52:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
joachim99@52:    GNU General Public License for more details.
joachim99@52: 
joachim99@52:    You should have received a copy of the GNU General Public License
joachim99@52:    along with this program; if not, write to the Free Software Foundation,
joachim99@69:    Inc., 51 Franklin Steet, Fifth Floor, Boston, MA 02110-1301, USA.  */
joachim99@52: 
joachim99@80: # include <config-kdiff3.h>
joachim99@52: 
joachim99@52: #include <sys/types.h>
joachim99@52: 
joachim99@52: 
joachim99@52: #include <stdlib.h>
joachim99@52: #include <string.h>
joachim99@52: 
joachim99@52: 
joachim99@52: #ifndef EXIT_FAILURE
joachim99@52: # define EXIT_FAILURE 1
joachim99@52: #endif
joachim99@52: 
joachim99@53: #include "gnudiff_diff.h"
joachim99@52: /* If non NULL, call this function when memory is exhausted. */
joachim99@52: //void (*xalloc_fail_func) PARAMS ((void)) = 0;
joachim99@52: void (*xalloc_fail_func)(void) = 0;
joachim99@52: 
joachim99@52: 
joachim99@53: void GnuDiff::xalloc_die (void)
joachim99@52: {
joachim99@52:   if (xalloc_fail_func)
joachim99@52:     (*xalloc_fail_func) ();
joachim99@52:   //error (exit_failure, 0, "%s", _(xalloc_msg_memory_exhausted));
joachim99@52:   /* The `noreturn' cannot be given to error, since it may return if
joachim99@52:      its first argument is 0.  To help compilers understand the
joachim99@52:      xalloc_die does terminate, call exit. */
joachim99@52:   exit (EXIT_FAILURE);
joachim99@52: }
joachim99@52: 
joachim99@52: /* Allocate N bytes of memory dynamically, with error checking.  */
joachim99@52: 
joachim99@52: void *
joachim99@53: GnuDiff::xmalloc (size_t n)
joachim99@52: {
joachim99@52:   void *p;
joachim99@52: 
joachim99@66:   p = malloc (n == 0 ? 1 : n); // There are systems where malloc returns 0 for n==0.
joachim99@52:   if (p == 0)
joachim99@52:     xalloc_die ();
joachim99@52:   return p;
joachim99@52: }
joachim99@52: 
joachim99@52: /* Change the size of an allocated block of memory P to N bytes,
joachim99@52:    with error checking.  */
joachim99@52: 
joachim99@52: void *
joachim99@53: GnuDiff::xrealloc (void *p, size_t n)
joachim99@52: {
joachim99@66:   p = realloc (p, n==0 ? 1 : n);
joachim99@52:   if (p == 0)
joachim99@52:     xalloc_die ();
joachim99@52:   return p;
joachim99@52: }
joachim99@52: 
joachim99@52: 
joachim99@52: /* Yield a new block of SIZE bytes, initialized to zero.  */
joachim99@52: 
joachim99@52: void *
joachim99@53: GnuDiff::zalloc (size_t size)
joachim99@52: {
joachim99@52:   void *p = xmalloc (size);
joachim99@52:   memset (p, 0, size);
joachim99@52:   return p;
joachim99@52: }