locale/programs/xmalloc.c

   1 /* xmalloc.c -- malloc with out of memory checking
   2    Copyright (C) 1990,91,92,93,94,95,96,97,2004,2005
   3    Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   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 version 2 as
   8    published by the Free Software Foundation.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, write to the Free Software Foundation,
  17    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  18
  19 #ifdef HAVE_CONFIG_H
  20 #include <config.h>
  21 #endif
  22
  23 #if __STDC__
  24 #define VOID void
  25 #else
  26 #define VOID char
  27 #endif
  28
  29 #include <sys/types.h>
  30
  31 #if STDC_HEADERS || _LIBC
  32 #include <stdlib.h>
  33 static VOID *fixup_null_alloc (size_t n) __THROW;
  34 VOID *xmalloc (size_t n) __THROW;
  35 VOID *xcalloc (size_t n, size_t s) __THROW;
  36 VOID *xrealloc (VOID *p, size_t n) __THROW;
  37 #else
  38 VOID *calloc ();
  39 VOID *malloc ();
  40 VOID *realloc ();
  41 void free ();
  42 #endif
  43
  44 #include <libintl.h>
  45 #include "error.h"
  46
  47 #ifndef _
  48 # define _(str) gettext (str)
  49 #endif
  50
  51 #ifndef EXIT_FAILURE
  52 #define EXIT_FAILURE 4
  53 #endif
  54
  55 /* Exit value when the requested amount of memory is not available.
  56    The caller may set it to some other value.  */
  57 int xmalloc_exit_failure = EXIT_FAILURE;
  58
  59 static VOID *
  60 fixup_null_alloc (n)
  61      size_t n;
  62 {
  63   VOID *p;
  64
  65   p = 0;
  66   if (n == 0)
  67     p = malloc ((size_t) 1);
  68   if (p == 0)
  69     error (xmalloc_exit_failure, 0, _("memory exhausted"));
  70   return p;
  71 }
  72
  73 /* Allocate N bytes of memory dynamically, with error checking.  */
  74
  75 VOID *
  76 xmalloc (n)
  77      size_t n;
  78 {
  79   VOID *p;
  80
  81   p = malloc (n);
  82   if (p == 0)
  83     p = fixup_null_alloc (n);
  84   return p;
  85 }
  86
  87 /* Allocate memory for N elements of S bytes, with error checking.  */
  88
  89 VOID *
  90 xcalloc (n, s)
  91      size_t n, s;
  92 {
  93   VOID *p;
  94
  95   p = calloc (n, s);
  96   if (p == 0)
  97     p = fixup_null_alloc (n);
  98   return p;
  99 }
 100
 101 /* Change the size of an allocated block of memory P to N bytes,
 102    with error checking.
 103    If P is NULL, run xmalloc.  */
 104
 105 VOID *
 106 xrealloc (p, n)
 107      VOID *p;
 108      size_t n;
 109 {
 110   if (p == 0)
 111     return xmalloc (n);
 112   p = realloc (p, n);
 113   if (p == 0)
 114     p = fixup_null_alloc (n);
 115   return p;
 116 }