Commit | Line | Data |
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60a17f4e JH |
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 * | |
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 * | |
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 | } |