lib/xmalloc.c

   1 /* xmalloc.c -- malloc with out of memory checking
   2    Copyright (C) 1990-1997, 98 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 #if ENABLE_NLS
  34 # include <libintl.h>
  35 # define _(Text) gettext (Text)
  36 #else
  37 # define textdomain(Domain)
  38 # define _(Text) Text
  39 #endif
  40 #define N_(Text) Text
  41
  42 #include "error.h"
  43 #include "xalloc.h"
  44
  45 #ifndef EXIT_FAILURE
  46 # define EXIT_FAILURE 1
  47 #endif
  48
  49 #ifndef HAVE_DONE_WORKING_MALLOC_CHECK
  50 you must run the autoconf test for a properly working malloc -- see malloc.m4
  51 #endif
  52
  53 #ifndef HAVE_DONE_WORKING_REALLOC_CHECK
  54 you must run the autoconf test for a properly working realloc -- see realloc.m4
  55 #endif
  56
  57 /* Exit value when the requested amount of memory is not available.
  58    The caller may set it to some other value.  */
  59 int xalloc_exit_failure = EXIT_FAILURE;
  60
  61 /* If non NULL, call this function when memory is exhausted. */
  62 void (*xalloc_fail_func) () = 0;
  63
  64 /* If XALLOC_FAIL_FUNC is NULL, or does return, display this message
  65    before exiting when memory is exhausted.  Goes through gettext. */
  66 char *const xalloc_msg_memory_exhausted = N_("Memory exhausted");
  67
  68 static void
  69 xalloc_fail (void)
  70 {
  71   if (xalloc_fail_func)
  72     (*xalloc_fail_func) ();
  73   error (xalloc_exit_failure, 0, xalloc_msg_memory_exhausted);
  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_fail ();
  86   return p;
  87 }
  88
  89 /* Change the size of an allocated block of memory P to N bytes,
  90    with error checking.
  91    If P is NULL, run xmalloc.  */
  92
  93 void *
  94 xrealloc (void *p, size_t n)
  95 {
  96   p = realloc (p, n);
  97   if (p == 0)
  98     xalloc_fail ();
  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_fail ();
 112   return p;
 113 }