gnu/dist/gettext/gettext-tools/lib/xmalloc.c

   1 /* xmalloc.c -- malloc with out of memory checking
   2    Copyright (C) 1990-1996, 2000-2003 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 /* Specification.  */
  23 #include "xalloc.h"
  24
  25 #include <stdlib.h>
  26
  27 #include "error.h"
  28 #include "exit.h"
  29 #include "gettext.h"
  30
  31 #define _(str) gettext (str)
  32
  33
  34 /* Exit value when the requested amount of memory is not available.
  35    The caller may set it to some other value.  */
  36 int xmalloc_exit_failure = EXIT_FAILURE;
  37
  38 void
  39 xalloc_die ()
  40 {
  41   error (xmalloc_exit_failure, 0, _("memory exhausted"));
  42   /* The `noreturn' cannot be given to error, since it may return if
  43      its first argument is 0.  To help compilers understand the
  44      xalloc_die does terminate, call exit. */
  45   exit (EXIT_FAILURE);
  46 }
  47
  48 static void *
  49 fixup_null_alloc (size_t n)
  50 {
  51   void *p;
  52
  53   p = 0;
  54   if (n == 0)
  55     p = malloc ((size_t) 1);
  56   if (p == NULL)
  57     xalloc_die ();
  58   return p;
  59 }
  60
  61 /* Allocate N bytes of memory dynamically, with error checking.  */
  62
  63 void *
  64 xmalloc (size_t n)
  65 {
  66   void *p;
  67
  68   p = malloc (n);
  69   if (p == NULL)
  70     p = fixup_null_alloc (n);
  71   return p;
  72 }
  73
  74 /* Allocate memory for N elements of S bytes, with error checking.  */
  75
  76 void *
  77 xcalloc (size_t n, size_t s)
  78 {
  79   void *p;
  80
  81   p = calloc (n, s);
  82   if (p == NULL)
  83     p = fixup_null_alloc (n);
  84   return p;
  85 }
  86
  87 /* Change the size of an allocated block of memory P to N bytes,
  88    with error checking.
  89    If P is NULL, run xmalloc.  */
  90
  91 void *
  92 xrealloc (void *p, size_t n)
  93 {
  94   if (p == NULL)
  95     return xmalloc (n);
  96   p = realloc (p, n);
  97   if (p == NULL)
  98     p = fixup_null_alloc (n);
  99   return p;
 100 }