1 /* xmalloc.c -- malloc with out of memory checking
2 Copyright (C) 1990, 1991 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 STDC_HEADERS
19 #include <stdlib.h>
20 #else
21 char *malloc ();
22 char *realloc ();
23 void free ();
24 #endif
25
26 void error ();
27
28 /* Allocate N bytes of memory dynamically, with error checking. */
29
30 char *
xmalloc(n)31 xmalloc (n)
32 unsigned n;
33 {
34 char *p;
35
36 p = malloc (n);
37 if (p == 0)
38 /* Must exit with 2 for `cmp'. */
39 error (2, 0, "virtual memory exhausted");
40 return p;
41 }
42
43 /* Change the size of an allocated block of memory P to N bytes,
44 with error checking.
45 If P is NULL, run xmalloc.
46 If N is 0, run free and return NULL. */
47
48 char *
xrealloc(p,n)49 xrealloc (p, n)
50 char *p;
51 unsigned n;
52 {
53 if (p == 0)
54 return xmalloc (n);
55 if (n == 0)
56 {
57 free (p);
58 return 0;
59 }
60 p = realloc (p, n);
61 if (p == 0)
62 /* Must exit with 2 for `cmp'. */
63 error (2, 0, "virtual memory exhausted");
64 return p;
65 }
66