diff options
Diffstat (limited to 'ncurses-5.3/ncurses/base/tries.c')
| -rw-r--r-- | ncurses-5.3/ncurses/base/tries.c | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/ncurses-5.3/ncurses/base/tries.c b/ncurses-5.3/ncurses/base/tries.c new file mode 100644 index 0000000..0b3a058 --- /dev/null +++ b/ncurses-5.3/ncurses/base/tries.c @@ -0,0 +1,144 @@ +/**************************************************************************** + * Copyright (c) 1998,2000,2001 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("$Id$") + +/* + * Expand a keycode into the string that it corresponds to, returning null if + * no match was found, otherwise allocating a string of the result. + */ +NCURSES_EXPORT(char *) +_nc_expand_try +(struct tries *tree, unsigned short code, int *count, size_t len) +{ + struct tries *ptr = tree; + char *result = 0; + + if (code != 0) { + while (ptr != 0) { + if ((result = _nc_expand_try(ptr->child, code, count, len + 1)) + != 0) { + break; + } + if (ptr->value == code) { + *count -= 1; + if (*count == -1) { + 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", _tracechar(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. + */ +NCURSES_EXPORT(int) +_nc_remove_key +(struct tries **tree, unsigned short code) +{ + T((T_CALLED("_nc_remove_key(%p,%d)"), tree, code)); + + if (code == 0) + returnCode(FALSE); + + while (*tree != 0) { + if (_nc_remove_key(&(*tree)->child, code)) { + returnCode(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); + } + returnCode(TRUE); + } + tree = &(*tree)->sibling; + } + returnCode(FALSE); +} + +/* + * Remove a string from the specified tree, freeing the unused nodes. Returns + * true if the string was found/removed. + */ +NCURSES_EXPORT(int) +_nc_remove_string(struct tries **tree, char *string) +{ + T((T_CALLED("_nc_remove_string(%p,%s)"), tree, _nc_visbuf(string))); + + if (string == 0 || *string == 0) + returnCode(FALSE); + + while (*tree != 0) { + if ((unsigned char) (*tree)->ch == (unsigned char) *string) { + if (string[1] != 0) + returnCode(_nc_remove_string(&(*tree)->child, string + 1)); + 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); + } + returnCode(TRUE); + } + tree = &(*tree)->sibling; + } + returnCode(FALSE); +} |