1 /****************************************************************************
2 * Copyright 2020 Thomas E. Dickey *
3 * Copyright 1998-2009,2010 Free Software Foundation, Inc. *
5 * Permission is hereby granted, free of charge, to any person obtaining a *
6 * copy of this software and associated documentation files (the *
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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>
43 MODULE_ID("$Id: tries.c,v 1.31 2020/02/02 23:34:34 tom Exp $")
46 * Expand a keycode into the string that it corresponds to, returning null if
47 * no match was found, otherwise allocating a string of the result.
49 NCURSES_EXPORT(char *)
50 _nc_expand_try(TRIES * tree, unsigned code, int *count, size_t len)
57 if ((result = _nc_expand_try(ptr->child, code, count, len + 1))
61 if (ptr->value == code) {
64 result = typeCalloc(char, len + 2);
72 if (ptr != 0 && (result[len] = (char) ptr->ch) == 0)
73 *((unsigned char *) (result + len)) = 128;
75 if (len == 0 && USE_TRACEF(TRACE_MAXIMUM)) {
76 _tracef("expand_key %s %s",
77 _nc_tracechar(CURRENT_SCREEN, (int) code),
79 _nc_unlock_global(tracef);
87 * Remove a code from the specified tree, freeing the unused nodes. Returns
88 * true if the code was found/removed.
91 _nc_remove_key(TRIES ** tree, unsigned code)
93 T((T_CALLED("_nc_remove_key(%p,%d)"), (void *) tree, code));
99 if (_nc_remove_key(&(*tree)->child, code)) {
102 if ((*tree)->value == code) {
103 if ((*tree)->child) {
104 /* don't cut the whole sub-tree */
107 TRIES *to_free = *tree;
108 *tree = (*tree)->sibling;
113 tree = &(*tree)->sibling;
119 * Remove a string from the specified tree, freeing the unused nodes. Returns
120 * true if the string was found/removed.
123 _nc_remove_string(TRIES ** tree, const char *string)
125 T((T_CALLED("_nc_remove_string(%p,%s)"), (void *) tree, _nc_visbuf(string)));
127 if (string == 0 || *string == 0)
131 if (UChar((*tree)->ch) == UChar(*string)) {
133 returnCode(_nc_remove_string(&(*tree)->child, string + 1));
134 if ((*tree)->child == 0) {
135 TRIES *to_free = *tree;
136 *tree = (*tree)->sibling;
143 tree = &(*tree)->sibling;