release/src/router/libncurses/ncurses/tinfo/comp_hash.c

   1 /****************************************************************************
   2  * Copyright (c) 1998-2008,2009 Free Software Foundation, Inc.              *
   3  *                                                                          *
   4  * Permission is hereby granted, free of charge, to any person obtaining a  *
   5  * copy of this software and associated documentation files (the            *
   6  * "Software"), to deal in the Software without restriction, including      *
   7  * without limitation the rights to use, copy, modify, merge, publish,      *
   8  * distribute, distribute with modifications, sublicense, and/or sell       *
   9  * copies of the Software, and to permit persons to whom the Software is    *
  10  * furnished to do so, subject to the following conditions:                 *
  11  *                                                                          *
  12  * The above copyright notice and this permission notice shall be included  *
  13  * in all copies or substantial portions of the Software.                   *
  14  *                                                                          *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
  16  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
  18  * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
  19  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
  20  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
  21  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
  22  *                                                                          *
  23  * Except as contained in this notice, the name(s) of the above copyright   *
  24  * holders shall not be used in advertising or otherwise to promote the     *
  25  * sale, use or other dealings in this Software without prior written       *
  26  * authorization.                                                           *
  27  ****************************************************************************/
  28
  29 /****************************************************************************
  30  *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
  31  *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
  32  *     and: Thomas E. Dickey                        1996-on                 *
  33  ****************************************************************************/
  34
  35 /*
  36  *      comp_hash.c --- Routines to deal with the hashtable of capability
  37  *                      names.
  38  *
  39  */
  40
  41 #define USE_TERMLIB 1
  42 #include <curses.priv.h>
  43
  44 #include <tic.h>
  45 #include <hashsize.h>
  46
  47 MODULE_ID("$Id: comp_hash.c,v 1.48 2009/08/08 17:36:21 tom Exp $")
  48
  49 /*
  50  * Finds the entry for the given string in the hash table if present.
  51  * Returns a pointer to the entry in the table or 0 if not found.
  52  */
  53 /* entrypoint used by tack (do not alter) */
  54 NCURSES_EXPORT(struct name_table_entry const *)
  55 _nc_find_entry(const char *string,
  56                const HashValue * hash_table)
  57 {
  58     bool termcap = (hash_table != _nc_get_hash_table(FALSE));
  59     const HashData *data = _nc_get_hash_info(termcap);
  60     int hashvalue;
  61     struct name_table_entry const *ptr = 0;
  62     struct name_table_entry const *real_table;
  63
  64     hashvalue = data->hash_of(string);
  65
  66     if (data->table_data[hashvalue] >= 0) {
  67
  68         real_table = _nc_get_table(termcap);
  69         ptr = real_table + data->table_data[hashvalue];
  70         while (!data->compare_names(ptr->nte_name, string)) {
  71             if (ptr->nte_link < 0) {
  72                 ptr = 0;
  73                 break;
  74             }
  75             ptr = real_table + (ptr->nte_link
  76                                 + data->table_data[data->table_size]);
  77         }
  78     }
  79
  80     return (ptr);
  81 }
  82
  83 /*
  84  * Finds the entry for the given name with the given type in the given table if
  85  * present (as distinct from _nc_find_entry, which finds the last entry
  86  * regardless of type).
  87  *
  88  * Returns a pointer to the entry in the table or 0 if not found.
  89  */
  90 NCURSES_EXPORT(struct name_table_entry const *)
  91 _nc_find_type_entry(const char *string,
  92                     int type,
  93                     bool termcap)
  94 {
  95     struct name_table_entry const *ptr = NULL;
  96     const HashData *data = _nc_get_hash_info(termcap);
  97     int hashvalue = data->hash_of(string);
  98
  99     if (data->table_data[hashvalue] >= 0) {
 100         const struct name_table_entry *const table = _nc_get_table(termcap);
 101
 102         ptr = table + data->table_data[hashvalue];
 103         while (ptr->nte_type != type
 104                || !data->compare_names(ptr->nte_name, string)) {
 105             if (ptr->nte_link < 0) {
 106                 ptr = 0;
 107                 break;
 108             }
 109             ptr = table + (ptr->nte_link + data->table_data[data->table_size]);
 110         }
 111     }
 112
 113     return ptr;
 114 }