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tetex-bin  3.0
key_defined.c
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00001 /****************************************************************************
00002  * Copyright (c) 2003 Free Software Foundation, Inc.                        *
00003  *                                                                          *
00004  * Permission is hereby granted, free of charge, to any person obtaining a  *
00005  * copy of this software and associated documentation files (the            *
00006  * "Software"), to deal in the Software without restriction, including      *
00007  * without limitation the rights to use, copy, modify, merge, publish,      *
00008  * distribute, distribute with modifications, sublicense, and/or sell       *
00009  * copies of the Software, and to permit persons to whom the Software is    *
00010  * furnished to do so, subject to the following conditions:                 *
00011  *                                                                          *
00012  * The above copyright notice and this permission notice shall be included  *
00013  * in all copies or substantial portions of the Software.                   *
00014  *                                                                          *
00015  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
00016  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
00017  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
00018  * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
00019  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
00020  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
00021  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
00022  *                                                                          *
00023  * Except as contained in this notice, the name(s) of the above copyright   *
00024  * holders shall not be used in advertising or otherwise to promote the     *
00025  * sale, use or other dealings in this Software without prior written       *
00026  * authorization.                                                           *
00027  ****************************************************************************/
00028 
00029 /****************************************************************************
00030  *  Author: Thomas E. Dickey, 2003                                          *
00031  ****************************************************************************/
00032 
00033 #include <curses.priv.h>
00034 
00035 MODULE_ID("$Id: key_defined.c,v 1.3 2003/05/17 23:12:27 tom Exp $")
00036 
00037 static int
00038 find_definition(struct tries *tree, const char *str)
00039 {
00040     struct tries *ptr;
00041     int result = 0;
00042 
00043     if (str != 0 && *str != '\0') {
00044        for (ptr = tree; ptr != 0; ptr = ptr->sibling) {
00045            if (UChar(*str) == UChar(ptr->ch)) {
00046               if (str[1] == '\0' && ptr->child != 0) {
00047                   result = -1;
00048               } else if ((result = find_definition(ptr->child, str + 1)) == 0) {
00049                   result = ptr->value;
00050               } else if (str[1] == '\0') {
00051                   result = -1;
00052               }
00053            }
00054            if (result != 0)
00055               break;
00056        }
00057     }
00058     return (result);
00059 }
00060 
00061 /*
00062  * Returns the keycode associated with the given string.  If none is found,
00063  * return 0.  If the string is only a prefix to other strings, return -1.
00064  */
00065 NCURSES_EXPORT(int)
00066 key_defined(const char *str)
00067 {
00068     int code = ERR;
00069 
00070     T((T_CALLED("key_defined(%s)"), _nc_visbuf(str)));
00071     if (SP != 0 && str != 0) {
00072        code = find_definition(SP->_keytry, str);
00073     }
00074 
00075     returnCode(code);
00076 }