xmalloc.c revision 21308 
1/* xmalloc.c -- safe versions of malloc and realloc */
2
3/* Copyright (C) 1991 Free Software Foundation, Inc.
4
5   This file is part of GNU Readline, a library for reading lines
6   of text with interactive input and history editing.
7
8   Readline is free software; you can redistribute it and/or modify it
9   under the terms of the GNU General Public License as published by the
10   Free Software Foundation; either version 1, or (at your option) any
11   later version.
12
13   Readline is distributed in the hope that it will be useful, but
14   WITHOUT ANY WARRANTY; without even the implied warranty of
15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16   General Public License for more details.
17
18   You should have received a copy of the GNU General Public License
19   along with Readline; see the file COPYING.  If not, write to the Free
20   Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
21
22#if defined (HAVE_CONFIG_H)
23#include <config.h>
24#endif
25
26#include <stdio.h>
27
28#if defined (HAVE_STDLIB_H)
29#  include <stdlib.h>
30#else
31#  include "ansi_stdlib.h"
32#endif /* HAVE_STDLIB_H */
33
34static void memory_error_and_abort ();
35
36/* **************************************************************** */
37/*								    */
38/*		   Memory Allocation and Deallocation.		    */
39/*								    */
40/* **************************************************************** */
41
42/* Return a pointer to free()able block of memory large enough
43   to hold BYTES number of bytes.  If the memory cannot be allocated,
44   print an error message and abort. */
45char *
46xmalloc (bytes)
47     int bytes;
48{
49  char *temp;
50
51  temp = (char *)malloc (bytes);
52  if (temp == 0)
53    memory_error_and_abort ("xmalloc");
54  return (temp);
55}
56
57char *
58xrealloc (pointer, bytes)
59     char *pointer;
60     int bytes;
61{
62  char *temp;
63
64  temp = pointer ? (char *)realloc (pointer, bytes) : (char *)malloc (bytes);
65
66  if (temp == 0)
67    memory_error_and_abort ("xrealloc");
68  return (temp);
69}
70
71static void
72memory_error_and_abort (fname)
73     char *fname;
74{
75  fprintf (stderr, "%s: out of virtual memory\n", fname);
76  exit (2);
77}
78
79/* Use this as the function to call when adding unwind protects so we
80   don't need to know what free() returns. */
81void
82xfree (string)
83     char *string;
84{
85  if (string)
86    free (string);
87}
88