/*
 *  libfb - FreeBASIC's runtime library
 *	Copyright (C) 2004-2010 The FreeBASIC development team.
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  As a special exception, the copyright holders of this library give
 *  you permission to link this library with independent modules to
 *  produce an executable, regardless of the license terms of these
 *  independent modules, and to copy and distribute the resulting
 *  executable under terms of your choice, provided that you also meet,
 *  for each linked independent module, the terms and conditions of the
 *  license of that module. An independent module is a module which is
 *  not derived from or based on this library. If you modify this library,
 *  you may extend this exception to your version of the library, but
 *  you are not obligated to do so. If you do not wish to do so, delete
 *  this exception statement from your version.
 */

/*
 * str_rtrimany.c -- ltrim$ ANY function
 *
 * chng: aug/2005 written [mjs]
 *
 */

#include "fb.h"


/*:::::*/
FBCALL FBSTRING *fb_LTrimAny 
	( 
		FBSTRING *src, 
		FBSTRING *pattern 
	)
{
    const char *pachText = NULL;
	FBSTRING *dst;
	size_t len;

    if( src == NULL ) 
    {
        fb_hStrDelTemp( pattern );
        return &__fb_ctx.null_desc;
    }

   	FB_STRLOCK();

	len = 0;
	if( src->data != NULL )
    {
        size_t len_pattern = ((pattern != NULL) && (pattern->data != NULL)? FB_STRSIZE( pattern ) : 0);
        pachText = src->data;
        len = FB_STRSIZE( src );
		if( len_pattern != 0 )
		{
			while ( len != 0 )
	        {
	            size_t i;
	            for( i=0; i!=len_pattern; ++i ) 
	            {
	                if( FB_MEMCHR( pattern->data, *pachText, len_pattern )!=NULL )
	                    break;
	            }
	            
	            if( i==len_pattern )
	                break;

	            --len;
	            ++pachText;
			}
		}
	}

	if( len > 0 )
	{
		/* alloc temp string */
        dst = fb_hStrAllocTemp_NoLock( NULL, len );
		if( dst != NULL )
		{
			/* simple copy */
			fb_hStrCopy( dst->data, pachText, len );
		}
		else
			dst = &__fb_ctx.null_desc;
    }
	else
		dst = &__fb_ctx.null_desc;

	/* del if temp */
	fb_hStrDelTemp_NoLock( src );
    fb_hStrDelTemp_NoLock( pattern );

   	FB_STRUNLOCK();

	return dst;
}

