blob: 455d142edc8eefab94eb1122503c848da4a7acaa [file] [log] [blame]
Amit Daniel Kachhape6a01f52011-07-20 11:45:59 +05301/****************************************************************************
2 * Copyright (c) 1998-2005,2006 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 1998-on *
31 ****************************************************************************/
32
33/*
34** add_tries.c
35**
36** Add keycode/string to tries-tree.
37**
38*/
39
40#include <curses.priv.h>
41
42MODULE_ID("$Id: add_tries.c,v 1.8 2006/12/30 23:15:26 tom Exp $")
43
44#define SET_TRY(dst,src) if ((dst->ch = *src++) == 128) dst->ch = '\0'
45#define CMP_TRY(a,b) ((a)? (a == b) : (b == 128))
46
47NCURSES_EXPORT(int)
48_nc_add_to_try(TRIES ** tree, const char *str, unsigned code)
49{
50 TRIES *ptr, *savedptr;
51 unsigned const char *txt = (unsigned const char *) str;
52
53 T((T_CALLED("_nc_add_to_try(%p, %s, %u)"), *tree, _nc_visbuf(str), code));
54 if (txt == 0 || *txt == '\0' || code == 0)
55 returnCode(ERR);
56
57 if ((*tree) != 0) {
58 ptr = savedptr = (*tree);
59
60 for (;;) {
61 unsigned char cmp = *txt;
62
63 while (!CMP_TRY(ptr->ch, cmp)
64 && ptr->sibling != 0)
65 ptr = ptr->sibling;
66
67 if (CMP_TRY(ptr->ch, cmp)) {
68 if (*(++txt) == '\0') {
69 ptr->value = code;
70 returnCode(OK);
71 }
72 if (ptr->child != 0)
73 ptr = ptr->child;
74 else
75 break;
76 } else {
77 if ((ptr->sibling = typeCalloc(TRIES, 1)) == 0) {
78 returnCode(ERR);
79 }
80
81 savedptr = ptr = ptr->sibling;
82 SET_TRY(ptr, txt);
83 ptr->value = 0;
84
85 break;
86 }
87 } /* end for (;;) */
88 } else { /* (*tree) == 0 :: First sequence to be added */
89 savedptr = ptr = (*tree) = typeCalloc(TRIES, 1);
90
91 if (ptr == 0) {
92 returnCode(ERR);
93 }
94
95 SET_TRY(ptr, txt);
96 ptr->value = 0;
97 }
98
99 /* at this point, we are adding to the try. ptr->child == 0 */
100
101 while (*txt) {
102 ptr->child = typeCalloc(TRIES, 1);
103
104 ptr = ptr->child;
105
106 if (ptr == 0) {
107 while ((ptr = savedptr) != 0) {
108 savedptr = ptr->child;
109 free(ptr);
110 }
111 returnCode(ERR);
112 }
113
114 SET_TRY(ptr, txt);
115 ptr->value = 0;
116 }
117
118 ptr->value = code;
119 returnCode(OK);
120}