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 VOID *xmalloc __P ((size_t n));
  34 VOID *xcalloc __P ((size_t n, size_t s));
  35 VOID *xrealloc __P ((VOID *p, size_t n));
  36 #else
  37 VOID *calloc ();
  38 VOID *malloc ();
  39 VOID *realloc ();
  40 void free ();
  41 #endif
  42
  43 #include <libintl.h>
  44 #include "error.h"
  45
  46 #ifndef _
  47 # define _(str) gettext (str)
  48 #endif
  49
  50 #ifndef EXIT_FAILURE
  51 #define EXIT_FAILURE 4
  52 #endif
  53
  54 /* Exit value when the requested amount of memory is not available.
  55    The caller may set it to some other value.  */
  56 int xmalloc_exit_failure = EXIT_FAILURE;
  57
  58 static VOID *
  59 fixup_null_alloc (n)
  60      size_t n;
  61 {
  62   VOID *p;
  63
  64   p = 0;
  65   if (n == 0)
  66     p = malloc ((size_t) 1);
  67   if (p == 0)
  68     error (xmalloc_exit_failure, 0, _("memory exhausted"));
  69   return p;
  70 }
  71
  72 /* Allocate N bytes of memory dynamically, with error checking.  */
  73
  74 VOID *
  75 xmalloc (n)
  76      size_t n;
  77 {
  78   VOID *p;
  79
  80   p = malloc (n);
  81   if (p == 0)
  82     p = fixup_null_alloc (n);
  83   return p;
  84 }
  85
  86 /* Allocate memory for N elements of S bytes, with error checking.  */
  87
  88 VOID *
  89 xcalloc (n, s)
  90      size_t n, s;
  91 {
  92   VOID *p;
  93
  94   p = calloc (n, s);
  95   if (p == 0)
  96     p = fixup_null_alloc (n);
  97   return p;
  98 }
  99
 100 /* Change the size of an allocated block of memory P to N bytes,
 101    with error checking.
 102    If P is NULL, run xmalloc.  */
 103
 104 VOID *
 105 xrealloc (p, n)
 106      VOID *p;
 107      size_t n;
 108 {
 109   if (p == 0)
 110     return xmalloc (n);
 111   p = realloc (p, n);
 112   if (p == 0)
 113     p = fixup_null_alloc (n);
 114   return p;
 115 }