1 /* xmalloc.c -- malloc with out of memory checking
2 Copyright (C) 1990, 1991, 1993 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 #if __STDC__ && defined (HAVE_VPRINTF)
39 void error (int, int, char const *, ...);
40 #else
41 void error ();
42 #endif
43
44 /* Allocate N bytes of memory dynamically, with error checking. */
45
46 VOID *
xmalloc(n)47 xmalloc (n)
48 size_t n;
49 {
50 VOID *p;
51
52 p = malloc (n);
53 if (p == 0)
54 /* Must exit with 2 for `cmp'. */
55 error (2, 0, "memory exhausted");
56 return p;
57 }
58
59 /* Change the size of an allocated block of memory P to N bytes,
60 with error checking.
61 If P is NULL, run xmalloc.
62 If N is 0, run free and return NULL. */
63
64 VOID *
xrealloc(p,n)65 xrealloc (p, n)
66 VOID *p;
67 size_t n;
68 {
69 if (p == 0)
70 return xmalloc (n);
71 if (n == 0)
72 {
73 free (p);
74 return 0;
75 }
76 p = realloc (p, n);
77 if (p == 0)
78 /* Must exit with 2 for `cmp'. */
79 error (2, 0, "memory exhausted");
80 return p;
81 }
82