locale/programs/xmalloc.c

   1 /* xmalloc.c -- malloc with out of memory checking
   2    Copyright (C) 1990,91,92,93,94,95,96,97 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library 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 GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #include <config.h>
  22 #endif
  23
  24 #if __STDC__
  25 #define VOID void
  26 #else
  27 #define VOID char
  28 #endif
  29
  30 #include <sys/types.h>
  31
  32 #if STDC_HEADERS || _LIBC
  33 #include <stdlib.h>
  34 static VOID *fixup_null_alloc __P ((size_t n));
  35 VOID *xmalloc __P ((size_t n));
  36 VOID *xcalloc __P ((size_t n, size_t s));
  37 VOID *xrealloc __P ((VOID *p, size_t n));
  38 #else
  39 VOID *calloc ();
  40 VOID *malloc ();
  41 VOID *realloc ();
  42 void free ();
  43 #endif
  44
  45 #include <libintl.h>
  46 #include "error.h"
  47
  48 #ifndef _
  49 # define _(str) gettext (str)
  50 #endif
  51
  52 #ifndef EXIT_FAILURE
  53 #define EXIT_FAILURE 4
  54 #endif
  55
  56 /* Exit value when the requested amount of memory is not available.
  57    The caller may set it to some other value.  */
  58 int xmalloc_exit_failure = EXIT_FAILURE;
  59
  60 static VOID *
  61 fixup_null_alloc (n)
  62      size_t n;
  63 {
  64   VOID *p;
  65
  66   p = 0;
  67   if (n == 0)
  68     p = malloc ((size_t) 1);
  69   if (p == 0)
  70     error (xmalloc_exit_failure, 0, _("memory exhausted"));
  71   return p;
  72 }
  73
  74 /* Allocate N bytes of memory dynamically, with error checking.  */
  75
  76 VOID *
  77 xmalloc (n)
  78      size_t n;
  79 {
  80   VOID *p;
  81
  82   p = malloc (n);
  83   if (p == 0)
  84     p = fixup_null_alloc (n);
  85   return p;
  86 }
  87
  88 /* Allocate memory for N elements of S bytes, with error checking.  */
  89
  90 VOID *
  91 xcalloc (n, s)
  92      size_t n, s;
  93 {
  94   VOID *p;
  95
  96   p = calloc (n, s);
  97   if (p == 0)
  98     p = fixup_null_alloc (n);
  99   return p;
 100 }
 101
 102 /* Change the size of an allocated block of memory P to N bytes,
 103    with error checking.
 104    If P is NULL, run xmalloc.  */
 105
 106 VOID *
 107 xrealloc (p, n)
 108      VOID *p;
 109      size_t n;
 110 {
 111   if (p == 0)
 112     return xmalloc (n);
 113   p = realloc (p, n);
 114   if (p == 0)
 115     p = fixup_null_alloc (n);
 116   return p;
 117 }