1 /****************************************************************************
2 * Copyright 2020,2023 Thomas E. Dickey *
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28 ****************************************************************************/
30 /****************************************************************************
31 * Author: Thomas E. Dickey <dickey@clark.net> 1997 *
32 ****************************************************************************/
37 ** Functions to manage the tree of partial-completions for keycodes.
41 #include <curses.priv.h>
44 MODULE_ID("$Id: tries.c,v 1.32 2023/06/24 15:36:23 tom Exp $")
47 * Expand a keycode into the string that it corresponds to, returning null if
48 * no match was found, otherwise allocating a string of the result.
50 NCURSES_EXPORT(char *)
51 _nc_expand_try(TRIES * tree, unsigned code, int *count, size_t len)
58 if ((result = _nc_expand_try(ptr->child, code, count, len + 1))
62 if (ptr->value == code) {
65 result = typeCalloc(char, len + 2);
73 if (ptr != 0 && (result[len] = (char) ptr->ch) == 0)
74 *((unsigned char *) (result + len)) = 128;
76 if (len == 0 && USE_TRACEF(TRACE_MAXIMUM)) {
77 _tracef("expand_key %s %s",
78 _nc_tracechar(CURRENT_SCREEN, (int) code),
80 _nc_unlock_global(tracef);
88 * Remove a code from the specified tree, freeing the unused nodes. Returns
89 * true if the code was found/removed.
92 _nc_remove_key(TRIES ** tree, unsigned code)
94 T((T_CALLED("_nc_remove_key(%p,%d)"), (void *) tree, code));
100 if (_nc_remove_key(&(*tree)->child, code)) {
103 if ((*tree)->value == code) {
104 if ((*tree)->child) {
105 /* don't cut the whole sub-tree */
108 TRIES *to_free = *tree;
109 *tree = (*tree)->sibling;
114 tree = &(*tree)->sibling;
120 * Remove a string from the specified tree, freeing the unused nodes. Returns
121 * true if the string was found/removed.
124 _nc_remove_string(TRIES ** tree, const char *string)
126 T((T_CALLED("_nc_remove_string(%p,%s)"), (void *) tree, _nc_visbuf(string)));
128 if (!VALID_STRING(string) || *string == 0)
132 if (UChar((*tree)->ch) == UChar(*string)) {
134 returnCode(_nc_remove_string(&(*tree)->child, string + 1));
135 if ((*tree)->child == 0) {
136 TRIES *to_free = *tree;
137 *tree = (*tree)->sibling;
144 tree = &(*tree)->sibling;