rstsrch.c

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C语言 代码 · 共 78 行

/****************************************************************************
*
*                            Open Watcom Project
*
*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
*  ========================================================================
*
*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
*    Public License version 1.0 (the 'License'). You may not use this file
*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
*    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
*    provided with the Original Code and Modifications, and is also
*    available at www.sybase.com/developer/opensource.
*
*    The Original Code and all software distributed under the License are
*    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
*    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
*    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
*    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
*    NON-INFRINGEMENT. Please see the License for the specific language
*    governing rights and limitations under the License.
*
*  ========================================================================
*
* Description:  symbol table search
*
****************************************************************************/


#include "ftnstd.h"
#include "symbol.h"
#include "fhash.h"

#include <string.h>

unsigned                HashValue;
hash_entry              HashTable[HASH_PRIME];


sym_id        STSearch( char *name, int len, sym_id head ) {
//==========================================================

// Search symbol table for given name.

    for(;;) {
        if( head == NULL ) break;
        if( head->ns.name_len == len ) {
            if( memcmp( name, &head->ns.name, len ) == 0 ) break;
        }
        head = head->ns.link;
    }
    return( head );
}


sym_id        STNameSearch( char *name, int len ) {
//=================================================

// Search symbol table for given name.

    sym_id      head;
    sym_id      tail;

    HashValue = CalcHash( name, len );
    head = HashTable[ HashValue ].h_head;
    if( head == NULL ) return( NULL );
    tail = HashTable[ HashValue ].h_tail;
    for(;;) {
        if( head->ns.name_len == len ) {
            if( memcmp( name, &head->ns.name, len ) == 0 ) return( head );
        }
        if( head == tail ) return( NULL );
        head = head->ns.link;
    }
}