diff options
Diffstat (limited to 'lib/libcurses/base/tries.c')
| -rw-r--r-- | lib/libcurses/base/tries.c | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/lib/libcurses/base/tries.c b/lib/libcurses/base/tries.c new file mode 100644 index 00000000000..522bc6542bd --- /dev/null +++ b/lib/libcurses/base/tries.c @@ -0,0 +1,105 @@ +/* $OpenBSD: tries.c,v 1.1 1999/01/18 19:10:07 millert Exp $ */ + +/**************************************************************************** + * Copyright (c) 1998 Free Software Foundation, Inc. * + * * + * Permission is hereby granted, free of charge, to any person obtaining a * + * copy of this software and associated documentation files (the * + * "Software"), to deal in the Software without restriction, including * + * without limitation the rights to use, copy, modify, merge, publish, * + * distribute, distribute with modifications, sublicense, and/or sell * + * copies of the Software, and to permit persons to whom the Software is * + * furnished to do so, subject to the following conditions: * + * * + * The above copyright notice and this permission notice shall be included * + * in all copies or substantial portions of the Software. * + * * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * + * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * + * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * + * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * + * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * + * * + * Except as contained in this notice, the name(s) of the above copyright * + * holders shall not be used in advertising or otherwise to promote the * + * sale, use or other dealings in this Software without prior written * + * authorization. * + ****************************************************************************/ + +/**************************************************************************** + * Author: Thomas E. Dickey <dickey@clark.net> 1997 * + ****************************************************************************/ + +/* +** tries.c +** +** Functions to manage the tree of partial-completions for keycodes. +** +*/ + +#include <curses.priv.h> + +MODULE_ID("$From: tries.c,v 1.8 1998/11/07 22:54:48 tom Exp $") + +/* + * Expand a keycode into the string that it corresponds to, returning null if + * no match was found, otherwise allocating a string of the result. + */ +char *_nc_expand_try(struct tries *tree, unsigned short code, size_t len) +{ + struct tries *ptr = tree; + char *result = 0; + + if (code != 0) { + while (ptr != 0) { + if ((result = _nc_expand_try(ptr->child, code, len + 1)) != 0) { + break; + } + if (ptr->value == code) { + result = typeCalloc(char, len+2); + break; + } + ptr = ptr->sibling; + } + } + if (result != 0) { + if ((result[len] = ptr->ch) == 0) + *((unsigned char *)(result+len)) = 128; +#ifdef TRACE + if (len == 0) + _tracef("expand_key %s %s", _trace_key(code), _nc_visbuf(result)); +#endif + } + return result; +} + +/* + * Remove a code from the specified tree, freeing the unused nodes. Returns + * true if the code was found/removed. + */ +int _nc_remove_key(struct tries **tree, unsigned short code) +{ + if (code == 0) + return FALSE; + + while (*tree != 0) { + if (_nc_remove_key(&(*tree)->child, code)) { + return TRUE; + } + if ((*tree)->value == code) { + if((*tree)->child) { + /* don't cut the whole sub-tree */ + (*tree)->value = 0; + } else { + struct tries *to_free = *tree; + *tree = (*tree)->sibling; + free(to_free); + } + return TRUE; + } + tree = &(*tree)->sibling; + } + return FALSE; +} |