239 lines
4.9 KiB
C
239 lines
4.9 KiB
C
/*
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* CDE - Common Desktop Environment
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*
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* Copyright (c) 1993-2012, The Open Group. All rights reserved.
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*
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* These libraries and programs are free software; you can
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* redistribute them and/or modify them under the terms of the GNU
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* Lesser General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* These libraries and programs are distributed in the hope that
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* they will be useful, but WITHOUT ANY WARRANTY; without even the
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* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU Lesser General Public License for more
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* details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with these librararies and programs; if not, write
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* to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
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* Floor, Boston, MA 02110-1301 USA
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*/
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/*
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* @OSF_COPYRIGHT@
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* COPYRIGHT NOTICE
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* Copyright (c) 1990, 1991, 1992, 1993 Open Software Foundation, Inc.
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* ALL RIGHTS RESERVED (MOTIF). See the file named COPYRIGHT.MOTIF for
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* the full copyright text.
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*/
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/*
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* HISTORY
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*/
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#ifdef REV_INFO
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#ifndef lint
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static char rcsid[] = "$XConsortium: UilKeyTab.c /main/11 1995/07/14 09:34:29 drk $"
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#endif
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#endif
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/*
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* (c) Copyright 1989, 1990, DIGITAL EQUIPMENT CORPORATION, MAYNARD, MASS. */
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/*
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**++
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** FACILITY:
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**
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** User Interface Language Compiler (UIL)
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**
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** ABSTRACT:
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**
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** This module contains the keyword table used by the lexical analyzer
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** to look up the keywords in the UIL.
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**
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**--
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**/
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/*
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**
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** INCLUDE FILES
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**
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**/
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#include "UilDefI.h"
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/*
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**
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** DEFINE and MACRO DEFINITIONS
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**
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**/
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/*
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**
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** EXTERNAL VARIABLE DECLARATIONS
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**
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**/
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/*
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**
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** GLOBAL VARIABLE DECLARATIONS
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**
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**/
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/*
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**
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** OWN VARIABLE DECLARATIONS
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**
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**/
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/* Keyword table pointer. */
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static key_keytable_entry_type * key_keytable_ptr;
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/*
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**++
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** FUNCTIONAL DESCRIPTION:
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**
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** This routine searches for a symbol in the compiler's keyword table.
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** There are two arguments to the routine, the length of the symbol and
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** the address of the start of the symbol. The routine returns the
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** address of the keyword entry found, or a NULL pointer if the
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** symbol is not found in the table.
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**
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** The search for the symbol is case sensitive depending upon the
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** keytable binding that was established by the key_initialize routine.
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**
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** The require file UilKeyTab.h defines and initializes the keyword
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** tables. It is built automatically from other files, thus it should
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** not be hand editted.
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**
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** FORMAL PARAMETERS:
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**
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** symbol_length.rl.v : length of symbol to look up
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** symbol_ptr.ra.v : address of symbol to look up
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**
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** IMPLICIT INPUTS:
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**
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** key_keytable_ptr : current keyword table
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**
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** IMPLICIT OUTPUTS:
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**
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** none
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**
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** FUNCTION VALUE:
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**
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** NULL : if the symbol is not in the keyword table
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** otherwise : the address of the keyword table entry for
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** the specified symbol.
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**
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** SIDE EFFECTS:
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**
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** none
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**
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**--
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**/
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key_keytable_entry_type *
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key_find_keyword (symbol_length, symbol_ptr)
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unsigned int symbol_length;
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char * symbol_ptr;
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{
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int
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lower_limit,
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upper_limit;
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/* Check the arguments. */
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if (symbol_length > key_k_keyword_max_length)
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return NULL;
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/* Initialize region to search. */
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lower_limit = 0;
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upper_limit = key_k_keyword_count-1;
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/* Perform binary search on keyword index. */
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do {
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int mid_point, result;
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key_keytable_entry_type * keyword_entry_ptr;
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mid_point = (lower_limit + upper_limit) >> 1; /* divide by 2 */
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keyword_entry_ptr = & key_keytable_ptr [mid_point];
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result = strcmp (symbol_ptr, keyword_entry_ptr -> at_name);
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if (result == 0) {
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return keyword_entry_ptr; /* Found keyword. */
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} else if (result < 0) {
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upper_limit = mid_point - 1; /* Search lower half. */
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} else {
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lower_limit = mid_point + 1; /* Search upper half. */
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}
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} while (lower_limit <= upper_limit);
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/* If we fall out of the bottom of the loop, symbol was not found. */
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return NULL;
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}
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/*
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**++
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** FUNCTIONAL DESCRIPTION:
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**
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** This routine initializes the keyword lookup facility. It can be
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** called multiple times during a single compilation. It must be called
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** at least once before the keyword table is accessed.
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**
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** FORMAL PARAMETERS:
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**
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** none
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**
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** IMPLICIT INPUTS:
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**
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** uil_v_case_sensitive : case sensitive switch, determines which
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** : keyword table to use.
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**
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** IMPLICIT OUTPUTS:
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**
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** key_keytable_ptr : pointer to the keyword table to
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** use for keyword lookups.
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**
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** FUNCTION VALUE:
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**
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** none
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**
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** SIDE EFFECTS:
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**
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** none
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**
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**--
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**/
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void
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key_initialize ()
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{
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/* Use the correct keyword table based on the global case
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sensitivity. */
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if (uil_v_case_sensitive) {
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key_keytable_ptr = key_table;
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} else {
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key_keytable_ptr = key_table_case_ins;
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}
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}
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