1 /****************************************************************************
2 * Copyright 2020,2021 Thomas E. Dickey *
3 * Copyright 1998-2002,2012 Free Software Foundation, Inc. *
4 * *
5 * Permission is hereby granted, free of charge, to any person obtaining a *
6 * copy of this software and associated documentation files (the *
7 * "Software"), to deal in the Software without restriction, including *
8 * without limitation the rights to use, copy, modify, merge, publish, *
9 * distribute, distribute with modifications, sublicense, and/or sell *
10 * copies of the Software, and to permit persons to whom the Software is *
11 * furnished to do so, subject to the following conditions: *
12 * *
13 * The above copyright notice and this permission notice shall be included *
14 * in all copies or substantial portions of the Software. *
15 * *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
19 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
20 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
21 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
22 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
23 * *
24 * Except as contained in this notice, the name(s) of the above copyright *
25 * holders shall not be used in advertising or otherwise to promote the *
26 * sale, use or other dealings in this Software without prior written *
27 * authorization. *
28 ****************************************************************************/
29
30 /****************************************************************************
31 * Author: Thomas E. Dickey <dickey@clark.net> 1998 *
32 ****************************************************************************/
33
34 /*
35 * Wrapper for malloc/realloc. Standard implementations allow realloc with
36 * a null pointer, but older libraries may not (e.g., SunOS).
37 *
38 * Also if realloc fails, we discard the old memory to avoid leaks.
39 */
40
41 #include <curses.priv.h>
42
43 MODULE_ID("$Id: doalloc.c,v 1.14 2021/04/24 23:43:39 tom Exp $")
44
45 void *
_nc_doalloc(void * oldp,size_t amount)46 _nc_doalloc(void *oldp, size_t amount)
47 {
48 void *newp;
49
50 if (oldp != NULL) {
51 if (amount == 0) {
52 free(oldp);
53 newp = NULL;
54 } else if ((newp = realloc(oldp, amount)) == 0) {
55 free(oldp);
56 errno = ENOMEM; /* just in case 'free' reset */
57 }
58 } else {
59 newp = malloc(amount);
60 }
61 return newp;
62 }
63