texinfo/lib/xmalloc.c

   1 /* xmalloc.c -- safe versions of malloc and realloc */
   2
   3 /* This file is part of GNU Info, a program for reading online documentation
   4    stored in Info format.
   5
   6    This file has appeared in prior works by the Free Software Foundation;
   7    thus it carries copyright dates from 1988 through 1993.
   8
   9    Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993 Free Software
  10    Foundation, Inc.
  11
  12    This program is free software; you can redistribute it and/or modify
  13    it under the terms of the GNU General Public License as published by
  14    the Free Software Foundation; either version 2, or (at your option)
  15    any later version.
  16
  17    This program is distributed in the hope that it will be useful,
  18    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20    GNU General Public License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program; if not, write to the Free Software
  24    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  25
  26    Written by Brian Fox (bfox@ai.mit.edu). */
  27
  28 #if !defined (ALREADY_HAVE_XMALLOC)
  29 #include <stdio.h>
  30 #include <sys/types.h>
  31
  32 extern void *malloc (), *realloc ();
  33 static void memory_error_and_abort ();
  34
  35 /* **************************************************************** */
  36 /*                                                                  */
  37 /*                 Memory Allocation and Deallocation.              */
  38 /*                                                                  */
  39 /* **************************************************************** */
  40
  41 /* Return a pointer to free()able block of memory large enough
  42    to hold BYTES number of bytes.  If the memory cannot be allocated,
  43    print an error message and abort. */
  44 void *
  45 xmalloc (bytes)
  46      int bytes;
  47 {
  48   void *temp = malloc (bytes);
  49
  50   if (!temp)
  51     memory_error_and_abort ("xmalloc");
  52   return (temp);
  53 }
  54
  55 void *
  56 xrealloc (pointer, bytes)
  57      void *pointer;
  58      int bytes;
  59 {
  60   void *temp;
  61
  62   if (!pointer)
  63     temp = malloc (bytes);
  64   else
  65     temp = realloc (pointer, bytes);
  66
  67   if (!temp)
  68     memory_error_and_abort ("xrealloc");
  69
  70   return (temp);
  71 }
  72
  73 static void
  74 memory_error_and_abort (fname)
  75      char *fname;
  76 {
  77   fprintf (stderr, "%s: Out of virtual memory!\n", fname);
  78   abort ();
  79 }
  80 #endif /* !ALREADY_HAVE_XMALLOC */