1 /* $OpenBSD: doalloc.c,v 1.8 2023/10/17 09:52:09 nicm Exp $ */
2
3 /****************************************************************************
4 * Copyright 2020,2021 Thomas E. Dickey *
5 * Copyright 1998-2002,2012 Free Software Foundation, Inc. *
6 * *
7 * Permission is hereby granted, free of charge, to any person obtaining a *
8 * copy of this software and associated documentation files (the *
9 * "Software"), to deal in the Software without restriction, including *
10 * without limitation the rights to use, copy, modify, merge, publish, *
11 * distribute, distribute with modifications, sublicense, and/or sell *
12 * copies of the Software, and to permit persons to whom the Software is *
13 * furnished to do so, subject to the following conditions: *
14 * *
15 * The above copyright notice and this permission notice shall be included *
16 * in all copies or substantial portions of the Software. *
17 * *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
21 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
24 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
25 * *
26 * Except as contained in this notice, the name(s) of the above copyright *
27 * holders shall not be used in advertising or otherwise to promote the *
28 * sale, use or other dealings in this Software without prior written *
29 * authorization. *
30 ****************************************************************************/
31
32 /****************************************************************************
33 * Author: Thomas E. Dickey <dickey@clark.net> 1998 *
34 ****************************************************************************/
35
36 /*
37 * Wrapper for malloc/realloc. Standard implementations allow realloc with
38 * a null pointer, but older libraries may not (e.g., SunOS).
39 *
40 * Also if realloc fails, we discard the old memory to avoid leaks.
41 */
42
43 #include <curses.priv.h>
44
45 MODULE_ID("$Id: doalloc.c,v 1.8 2023/10/17 09:52:09 nicm Exp $")
46
47 void *
_nc_doalloc(void * oldp,size_t amount)48 _nc_doalloc(void *oldp, size_t amount)
49 {
50 void *newp;
51
52 if (oldp != NULL) {
53 if (amount == 0) {
54 free(oldp);
55 newp = NULL;
56 } else if ((newp = realloc(oldp, amount)) == 0) {
57 free(oldp);
58 errno = ENOMEM; /* just in case 'free' reset */
59 }
60 } else {
61 newp = malloc(amount);
62 }
63 return newp;
64 }
65