/*
Copyright (C) 2004  Michael C. Shultz

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

Michael C. Shultz
ringworm@inbox.lv
Box 3238 Landers, CA 92285
*/

#include	<MGrInStringSwap.h>

int	MGrInStringSwap( char* stringOrig, char* oldTag, char* newTag )
{
	char*			Buffer			= NULL;
	unsigned	int	stringLength		= 0;
	unsigned	int	stringLengthLeft	= 0;
	unsigned	int	stringLengthNew 	= 0;
	int			stringLengthRight	= 0;
	int			stringLengthNewTag	= 0;
	int			stringLengthOldTag	= 0;

	stringLength		= strlen( stringOrig );

	if( !( strnstr( stringOrig, oldTag, stringLength ) ) )
	{
		return( 1 );
	}
	stringLengthLeft	= strnstr( stringOrig, oldTag, stringLength ) - stringOrig;
	stringLengthRight	= stringLength - ( stringLengthLeft + strlen( oldTag ) );
	stringLengthNewTag	= strlen( newTag );
	stringLengthNew 	= stringLengthLeft + stringLengthNewTag + stringLengthRight;
	stringLengthOldTag	= strlen( oldTag );
	Buffer	= ( char* )malloc( stringLengthNew + 1 );
	strncpy( Buffer, stringOrig, stringLengthLeft );	
	Buffer[ stringLengthLeft ]	= 0;
	strncat( Buffer, newTag, strlen(newTag)+1 );
	strncat( Buffer,
		stringOrig + stringLengthLeft + stringLengthOldTag,
		strlen(stringOrig + stringLengthLeft + stringLengthOldTag)+1 );
	strncpy( stringOrig, Buffer, strlen(Buffer)+1 );
	free( Buffer );
	return( 0 );
}