ncurses 4.2
[ncurses.git] / ncurses / trace_buf.c
1 /****************************************************************************
2  * Copyright (c) 1998 Free Software Foundation, Inc.                        *
3  *                                                                          *
4  * Permission is hereby granted, free of charge, to any person obtaining a  *
5  * copy of this software and associated documentation files (the            *
6  * "Software"), to deal in the Software without restriction, including      *
7  * without limitation the rights to use, copy, modify, merge, publish,      *
8  * distribute, distribute with modifications, sublicense, and/or sell       *
9  * copies of the Software, and to permit persons to whom the Software is    *
10  * furnished to do so, subject to the following conditions:                 *
11  *                                                                          *
12  * The above copyright notice and this permission notice shall be included  *
13  * in all copies or substantial portions of the Software.                   *
14  *                                                                          *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
16  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
18  * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
19  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
20  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
21  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
22  *                                                                          *
23  * Except as contained in this notice, the name(s) of the above copyright   *
24  * holders shall not be used in advertising or otherwise to promote the     *
25  * sale, use or other dealings in this Software without prior written       *
26  * authorization.                                                           *
27  ****************************************************************************/
28
29 /****************************************************************************
30  *  Author: Thomas E. Dickey <dickey@clark.net> 1997                        *
31  ****************************************************************************/
32 /*
33  *      trace_buf.c - Tracing/Debugging buffers (attributes)
34  */
35
36 #include <curses.priv.h>
37
38 MODULE_ID("$Id: trace_buf.c,v 1.3 1998/02/11 12:13:55 tom Exp $")
39
40 char * _nc_trace_buf(int bufnum, size_t want)
41 {
42         static struct {
43                 char *text;
44                 size_t size;
45         } *list;
46         static size_t have;
47
48 #if NO_LEAKS
49         if (bufnum < 0) {
50                 if (have) {
51                         while (have--) {
52                                 free(list[have].text);
53                         }
54                         free(list);
55                 }
56                 return 0;
57         }
58 #endif
59
60         if ((size_t)(bufnum+1) > have) {
61                 size_t need = (bufnum + 1) * 2;
62                 size_t used = sizeof(*list) * need;
63                 list = (list == 0) ? malloc(used) : realloc(list, used);
64                 while (need > have)
65                         list[have++].text = 0;
66         }
67
68         if (list[bufnum].text == 0)
69         {
70                 list[bufnum].text = malloc(want);
71                 list[bufnum].size = want;
72         }
73         else if (want > list[bufnum].size) {
74                 list[bufnum].text = realloc(list[bufnum].text, want);
75                 list[bufnum].size = want;
76         }
77         *(list[bufnum].text) = '\0';
78         return list[bufnum].text;
79 }