lib/xmalloc.c

   1 /* xmalloc.c -- malloc with out of memory checking
   2    Copyright (C) 1990-1999, 2000, 2002 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software Foundation,
  16    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 #if HAVE_CONFIG_H
  19 # include <config.h>
  20 #endif
  21
  22 #include <sys/types.h>
  23
  24 #if STDC_HEADERS
  25 # include <stdlib.h>
  26 #else
  27 void *calloc ();
  28 void *malloc ();
  29 void *realloc ();
  30 void free ();
  31 #endif
  32
  33 #include "gettext.h"
  34 #define _(msgid) gettext (msgid)
  35 #define N_(msgid) msgid
  36
  37 #include "error.h"
  38 #include "xalloc.h"
  39
  40 #ifndef EXIT_FAILURE
  41 # define EXIT_FAILURE 1
  42 #endif
  43
  44 /* The following tests require AC_PREREQ(2.54).  */
  45
  46 #ifndef HAVE_MALLOC
  47 "you must run the autoconf test for a GNU libc compatible malloc"
  48 #endif
  49
  50 #ifndef HAVE_REALLOC
  51 "you must run the autoconf test for a GNU libc compatible realloc"
  52 #endif
  53
  54 /* Exit value when the requested amount of memory is not available.
  55    The caller may set it to some other value.  */
  56 int xalloc_exit_failure = EXIT_FAILURE;
  57
  58 /* If non NULL, call this function when memory is exhausted. */
  59 void (*xalloc_fail_func) PARAMS ((void)) = 0;
  60
  61 /* If XALLOC_FAIL_FUNC is NULL, or does return, display this message
  62    before exiting when memory is exhausted.  Goes through gettext. */
  63 char const xalloc_msg_memory_exhausted[] = N_("memory exhausted");
  64
  65 void
  66 xalloc_die (void)
  67 {
  68   if (xalloc_fail_func)
  69     (*xalloc_fail_func) ();
  70   error (xalloc_exit_failure, 0, "%s", _(xalloc_msg_memory_exhausted));
  71   /* The `noreturn' cannot be given to error, since it may return if
  72      its first argument is 0.  To help compilers understand the
  73      xalloc_die does terminate, call exit. */
  74   exit (EXIT_FAILURE);
  75 }
  76
  77 /* Allocate N bytes of memory dynamically, with error checking.  */
  78
  79 void *
  80 xmalloc (size_t n)
  81 {
  82   void *p;
  83
  84   p = malloc (n);
  85   if (p == 0)
  86     xalloc_die ();
  87   return p;
  88 }
  89
  90 /* Change the size of an allocated block of memory P to N bytes,
  91    with error checking.  */
  92
  93 void *
  94 xrealloc (void *p, size_t n)
  95 {
  96   p = realloc (p, n);
  97   if (p == 0)
  98     xalloc_die ();
  99   return p;
 100 }
 101
 102 /* Allocate memory for N elements of S bytes, with error checking.  */
 103
 104 void *
 105 xcalloc (size_t n, size_t s)
 106 {
 107   void *p;
 108
 109   p = calloc (n, s);
 110   if (p == 0)
 111     xalloc_die ();
 112   return p;
 113 }