1 /* $OpenBSD: add_tries.c,v 1.5 2023/10/17 09:52:09 nicm Exp $ */
2
3 /****************************************************************************
4 * Copyright 2019-2020,2023 Thomas E. Dickey *
5 * Copyright 1998-2009,2010 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 1998-on *
34 ****************************************************************************/
35
36 /*
37 ** add_tries.c
38 **
39 ** Add keycode/string to tries-tree.
40 **
41 */
42
43 #include <curses.priv.h>
44 #include <tic.h>
45
46 MODULE_ID("$Id: add_tries.c,v 1.5 2023/10/17 09:52:09 nicm Exp $")
47
48 #define SET_TRY(dst,src) if ((dst->ch = *src++) == 128) dst->ch = '\0'
49 #define CMP_TRY(a,b) ((a)? (a == b) : (b == 128))
50
NCURSES_EXPORT(int)51 NCURSES_EXPORT(int)
52 _nc_add_to_try(TRIES ** tree, const char *str, unsigned code)
53 {
54 TRIES *ptr, *savedptr;
55 unsigned const char *txt = (unsigned const char *) str;
56
57 T((T_CALLED("_nc_add_to_try(%p, %s, %u)"),
58 (void *) *tree, _nc_visbuf(str), code));
59 if (!VALID_STRING(str) || *txt == '\0' || code == 0)
60 returnCode(ERR);
61
62 if ((*tree) != 0) {
63 ptr = savedptr = (*tree);
64
65 for (;;) {
66 unsigned char cmp = *txt;
67
68 while (!CMP_TRY(ptr->ch, cmp)
69 && ptr->sibling != 0)
70 ptr = ptr->sibling;
71
72 if (CMP_TRY(ptr->ch, cmp)) {
73 if (*(++txt) == '\0') {
74 ptr->value = (unsigned short) code;
75 returnCode(OK);
76 }
77 if (ptr->child != 0)
78 ptr = ptr->child;
79 else
80 break;
81 } else {
82 if ((ptr->sibling = typeCalloc(TRIES, 1)) == 0) {
83 returnCode(ERR);
84 }
85
86 savedptr = ptr = ptr->sibling;
87 SET_TRY(ptr, txt);
88 ptr->value = 0;
89
90 break;
91 }
92 } /* end for (;;) */
93 } else { /* (*tree) == 0 :: First sequence to be added */
94 savedptr = ptr = (*tree) = typeCalloc(TRIES, 1);
95
96 if (ptr == 0) {
97 returnCode(ERR);
98 }
99
100 SET_TRY(ptr, txt);
101 ptr->value = 0;
102 }
103
104 /* at this point, we are adding to the try. ptr->child == 0 */
105
106 while (*txt) {
107 ptr->child = typeCalloc(TRIES, 1);
108
109 ptr = ptr->child;
110
111 if (ptr == 0) {
112 while ((ptr = savedptr) != 0) {
113 savedptr = ptr->child;
114 free(ptr);
115 }
116 *tree = NULL;
117 returnCode(ERR);
118 }
119
120 SET_TRY(ptr, txt);
121 ptr->value = 0;
122 }
123
124 ptr->value = (unsigned short) code;
125 returnCode(OK);
126 }
127