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kolibrios/programs/develop/open watcom/trunk/clib/string/strspn.c
Sergey Semyonov (Serge) 836c97f0ac Clib string & memory functions
git-svn-id: svn://kolibrios.org@553 a494cfbc-eb01-0410-851d-a64ba20cac60
2007-06-26 00:54:22 +00:00

79 lines
2.6 KiB
C

/****************************************************************************
*
* 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: WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
* DESCRIBE IT HERE!
*
****************************************************************************/
#include "variety.h"
#include "widechar.h"
#include <stddef.h>
#include <string.h>
#include "setbits.h"
/* The strspn function computes the length of the initial segment of the
string pointed to by str which consists entirely of characters from
the string pointed to by charset.
*/
_WCRTLINK size_t __F_NAME(strspn,wcsspn) ( const CHAR_TYPE *str, const CHAR_TYPE *charset )
{
#if defined(__WIDECHAR__)
const CHAR_TYPE *p1;
const CHAR_TYPE *p2;
CHAR_TYPE tc1;
CHAR_TYPE tc2;
size_t len;
len = 0;
for( p1 = str; tc1 = *p1; p1++, len++ ) {
for( p2 = charset; tc2 = *p2; p2++ ) {
if( tc1 == tc2 ) break;
}
if( tc2 == NULLCHAR ) break;
}
return( len );
#else
unsigned /*char*/ tc;
unsigned char vector[32];
size_t len;
__setbits( vector, charset );
len = 0;
for( ; tc = (unsigned char) *str; ++str, ++len ) {
/* quit if we find any char not in charset */
if( ( vector[ tc >> 3 ] & _Bits[ tc & 0x07 ] ) == 0 ) break;
}
return( len );
#endif
}