gl/xmalloc.c

   1 /* xmalloc.c -- malloc with out of memory checking
   2
   3    Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
   4    1999, 2000, 2002, 2003 Free Software 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 2, or (at your option)
   9    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, write to the Free Software Foundation,
  18    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20 #if HAVE_CONFIG_H
  21 # include <config.h>
  22 #endif
  23
  24 #include <sys/types.h>
  25
  26 #if STDC_HEADERS
  27 # include <stdlib.h>
  28 #else
  29 void *calloc ();
  30 void *malloc ();
  31 void *realloc ();
  32 void free ();
  33 #endif
  34
  35 #include "gettext.h"
  36 #define _(msgid) gettext (msgid)
  37 #define N_(msgid) msgid
  38
  39 #include "error.h"
  40 #include "exitfail.h"
  41 #include "xalloc.h"
  42
  43 #ifndef EXIT_FAILURE
  44 # define EXIT_FAILURE 1
  45 #endif
  46
  47 /* The following tests require AC_PREREQ(2.54).  */
  48
  49 #ifndef HAVE_MALLOC
  50 "you must run the autoconf test for a GNU libc compatible malloc"
  51 #endif
  52
  53 #ifndef HAVE_REALLOC
  54 "you must run the autoconf test for a GNU libc compatible realloc"
  55 #endif
  56
  57 /* If non NULL, call this function when memory is exhausted. */
  58 void (*xalloc_fail_func) (void) = 0;
  59
  60 /* If XALLOC_FAIL_FUNC is NULL, or does return, display this message
  61    before exiting when memory is exhausted.  Goes through gettext. */
  62 char const xalloc_msg_memory_exhausted[] = N_("memory exhausted");
  63
  64 void
  65 xalloc_die (void)
  66 {
  67   if (xalloc_fail_func)
  68     (*xalloc_fail_func) ();
  69   error (exit_failure, 0, "%s", _(xalloc_msg_memory_exhausted));
  70   /* The `noreturn' cannot be given to error, since it may return if
  71      its first argument is 0.  To help compilers understand the
  72      xalloc_die does terminate, call exit. */
  73   exit (EXIT_FAILURE);
  74 }
  75
  76 /* Allocate N bytes of memory dynamically, with error checking.  */
  77
  78 void *
  79 xmalloc (size_t n)
  80 {
  81   void *p;
  82
  83   p = malloc (n);
  84   if (p == 0)
  85     xalloc_die ();
  86   return p;
  87 }
  88
  89 /* Change the size of an allocated block of memory P to N bytes,
  90    with error checking.  */
  91
  92 void *
  93 xrealloc (void *p, size_t n)
  94 {
  95   p = realloc (p, n);
  96   if (p == 0)
  97     xalloc_die ();
  98   return p;
  99 }
 100
 101 /* Allocate memory for N elements of S bytes, with error checking.  */
 102
 103 void *
 104 xcalloc (size_t n, size_t s)
 105 {
 106   void *p;
 107
 108   p = calloc (n, s);
 109   if (p == 0)
 110     xalloc_die ();
 111   return p;
 112 }