gnu/dist/diffutils/lib/xmalloc.c

   1 /*      $NetBSD$        */
   2
   3 /* xmalloc.c -- malloc with out of memory checking
   4    Copyright (C) 1990-1999, 2000, 2002 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 #if ENABLE_NLS
  36 # include <libintl.h>
  37 # define _(Text) gettext (Text)
  38 #else
  39 # define textdomain(Domain)
  40 # define _(Text) Text
  41 #endif
  42 #define N_(Text) Text
  43
  44 #include "error.h"
  45 #include "exitfail.h"
  46 #include "xalloc.h"
  47
  48 #ifndef EXIT_FAILURE
  49 # define EXIT_FAILURE 1
  50 #endif
  51
  52 #ifndef HAVE_DONE_WORKING_MALLOC_CHECK
  53 "you must run the autoconf test for a properly working malloc -- see malloc.m4"
  54 #endif
  55
  56 #ifndef HAVE_DONE_WORKING_REALLOC_CHECK
  57 "you must run the autoconf test for a properly working realloc --see realloc.m4"
  58 #endif
  59
  60 /* If non NULL, call this function when memory is exhausted. */
  61 void (*xalloc_fail_func) PARAMS ((void)) = 0;
  62
  63 /* If XALLOC_FAIL_FUNC is NULL, or does return, display this message
  64    before exiting when memory is exhausted.  Goes through gettext. */
  65 char const xalloc_msg_memory_exhausted[] = N_("memory exhausted");
  66
  67 void
  68 xalloc_die (void)
  69 {
  70   if (xalloc_fail_func)
  71     (*xalloc_fail_func) ();
  72   error (exit_failure, 0, "%s", _(xalloc_msg_memory_exhausted));
  73   /* The `noreturn' cannot be given to error, since it may return if
  74      its first argument is 0.  To help compilers understand the
  75      xalloc_die does terminate, call exit. */
  76   exit (EXIT_FAILURE);
  77 }
  78
  79 /* Allocate N bytes of memory dynamically, with error checking.  */
  80
  81 void *
  82 xmalloc (size_t n)
  83 {
  84   void *p;
  85
  86   p = malloc (n);
  87   if (p == 0)
  88     xalloc_die ();
  89   return p;
  90 }
  91
  92 /* Change the size of an allocated block of memory P to N bytes,
  93    with error checking.  */
  94
  95 void *
  96 xrealloc (void *p, size_t n)
  97 {
  98   p = realloc (p, n);
  99   if (p == 0)
 100     xalloc_die ();
 101   return p;
 102 }
 103
 104 /* Allocate memory for N elements of S bytes, with error checking.  */
 105
 106 void *
 107 xcalloc (size_t n, size_t s)
 108 {
 109   void *p;
 110
 111   p = calloc (n, s);
 112   if (p == 0)
 113     xalloc_die ();
 114   return p;
 115 }