contrib/cpio/xmalloc.c

   1 /* xmalloc.c -- malloc with out of memory checking
   2    Copyright (C) 1990, 91, 92, 93, 94 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., 675 Mass Ave, Cambridge, MA 02139, 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
  31 #include <stdlib.h>
  32 #else
  33 VOID *malloc ();
  34 VOID *realloc ();
  35 void free ();
  36 #endif
  37
  38 /* This is for other GNU distributions with internationalized messages.
  39    The GNU C Library itself does not yet support such messages.  */
  40 #if HAVE_LIBINTL_H
  41 # include <libintl.h>
  42 #else
  43 # define gettext(msgid) (msgid)
  44 #endif
  45
  46 #ifndef EXIT_FAILURE
  47 #define EXIT_FAILURE 1
  48 #endif
  49
  50 /* Exit value when the requested amount of memory is not available.
  51    The caller may set it to some other value.  */
  52 int xmalloc_exit_failure = EXIT_FAILURE;
  53
  54 #if __STDC__ && (HAVE_VPRINTF || HAVE_DOPRNT)
  55 void error (int, int, const char *, ...);
  56 #else
  57 void error ();
  58 #endif
  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, gettext ("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 /* Change the size of an allocated block of memory P to N bytes,
  89    with error checking.
  90    If P is NULL, run xmalloc.  */
  91
  92 VOID *
  93 xrealloc (p, n)
  94      VOID *p;
  95      size_t n;
  96 {
  97   if (p == 0)
  98     return xmalloc (n);
  99   p = realloc (p, n);
 100   if (p == 0)
 101     p = fixup_null_alloc (n);
 102   return p;
 103 }