locale/programs/xmalloc.c

   1 /* xmalloc.c -- malloc with out of memory checking
   2    Copyright (C) 1990, 91, 92, 93, 94, 95, 96 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
  16    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 #ifdef HAVE_CONFIG_H
  19 #include <config.h>
  20 #endif
  21
  22 #if __STDC__
  23 #define VOID void
  24 #else
  25 #define VOID char
  26 #endif
  27
  28 #include <sys/types.h>
  29
  30 #if STDC_HEADERS || _LIBC
  31 #include <stdlib.h>
  32 static VOID *fixup_null_alloc __P ((size_t n));
  33 #else
  34 VOID *calloc ();
  35 VOID *malloc ();
  36 VOID *realloc ();
  37 void free ();
  38 #endif
  39
  40 #include <libintl.h>
  41 #include "error.h"
  42
  43 #ifndef _
  44 # define _(str) gettext (str)
  45 #endif
  46
  47 #ifndef EXIT_FAILURE
  48 #define EXIT_FAILURE 4
  49 #endif
  50
  51 /* Exit value when the requested amount of memory is not available.
  52    The caller may set it to some other value.  */
  53 int xmalloc_exit_failure = EXIT_FAILURE;
  54
  55 static VOID *
  56 fixup_null_alloc (n)
  57      size_t n;
  58 {
  59   VOID *p;
  60
  61   p = 0;
  62   if (n == 0)
  63     p = malloc ((size_t) 1);
  64   if (p == 0)
  65     error (xmalloc_exit_failure, 0, _("memory exhausted"));
  66   return p;
  67 }
  68
  69 /* Allocate N bytes of memory dynamically, with error checking.  */
  70
  71 VOID *
  72 xmalloc (n)
  73      size_t n;
  74 {
  75   VOID *p;
  76
  77   p = malloc (n);
  78   if (p == 0)
  79     p = fixup_null_alloc (n);
  80   return p;
  81 }
  82
  83 /* Allocate memory for N elements of S bytes, with error checking.  */
  84
  85 VOID *
  86 xcalloc (n, s)
  87      size_t n, s;
  88 {
  89   VOID *p;
  90
  91   p = calloc (n, s);
  92   if (p == 0)
  93     p = fixup_null_alloc (n);
  94   return p;
  95 }
  96
  97 /* Change the size of an allocated block of memory P to N bytes,
  98    with error checking.
  99    If P is NULL, run xmalloc.  */
 100
 101 VOID *
 102 xrealloc (p, n)
 103      VOID *p;
 104      size_t n;
 105 {
 106   if (p == 0)
 107     return xmalloc (n);
 108   p = realloc (p, n);
 109   if (p == 0)
 110     p = fixup_null_alloc (n);
 111   return p;
 112 }