/**************************************************************
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 *
 *************************************************************/


#include <osl/interlck.h>

#ifndef _RTL_STRING_HXX_
#include <rtl/strbuf.hxx>
#endif
#include <rtl/memory.h>

/*
#include <rtl/alloc.h>
*/


/*************************************************************************
 *	rtl_stringbuffer_newFromStr_WithLength
 */
void SAL_CALL rtl_stringbuffer_newFromStr_WithLength( rtl_String ** newStr,
													  const sal_Char * value,
													  sal_Int32 count )
{
	if (!value)
	{
		rtl_string_new_WithLength( newStr, 16 );
		return;
	}

	rtl_string_new_WithLength( newStr, count + 16 );
	(*newStr)->length = count;
	rtl_copyMemory( (*newStr)->buffer, value, count );
	return;
}

/*************************************************************************
 *	rtl_stringbuffer_newFromStringBuffer
 */
sal_Int32 SAL_CALL rtl_stringbuffer_newFromStringBuffer( rtl_String ** newStr,
														 sal_Int32 capacity,
													     rtl_String * oldStr )
{
	sal_Int32 newCapacity = capacity;

	if (newCapacity < oldStr->length)
		newCapacity = oldStr->length;

	rtl_string_new_WithLength( newStr, newCapacity );
    if (oldStr->length > 0) {
        (*newStr)->length = oldStr->length;
        rtl_copyMemory( (*newStr)->buffer, oldStr->buffer, oldStr->length );
    }
	return newCapacity;
}

/*************************************************************************
 *	rtl_stringbuffer_ensureCapacity
 */
void SAL_CALL rtl_stringbuffer_ensureCapacity
	(rtl_String ** This, sal_Int32* capacity, sal_Int32 minimumCapacity)
{
	if (minimumCapacity > *capacity)
	{
		rtl_String * pTmp = *This;
		rtl_String * pNew = NULL;
		*capacity = ((*This)->length + 1) * 2;
		if (minimumCapacity > *capacity)
			/* still lower, set to the minimum capacity */
			*capacity = minimumCapacity;

		rtl_string_new_WithLength(&pNew, *capacity);
		pNew->length = (*This)->length;
		*This = pNew;

		rtl_copyMemory( (*This)->buffer, pTmp->buffer, pTmp->length );
		rtl_string_release( pTmp );
	}
}

/*************************************************************************
 *	rtl_stringbuffer_insert
 */
void SAL_CALL rtl_stringbuffer_insert( rtl_String ** This,
									   sal_Int32 * capacity,
									   sal_Int32 offset,
									   const sal_Char * str,
									   sal_Int32 len )
{
	sal_Int32 nOldLen;
	sal_Char * pBuf;
	sal_Int32 n;
	if( len != 0 )
	{
		if (*capacity < (*This)->length + len)
			rtl_stringbuffer_ensureCapacity( This, capacity, (*This)->length + len );

		/*
		if( len == 1 )
			This->buffer
		*/
		nOldLen = (*This)->length;
		pBuf = (*This)->buffer;

		/* copy the tail */
		n = (nOldLen - offset);
		if( n == 1 )
            /* optimized for 1 character */
			pBuf[offset + len] = pBuf[offset];
		else if( n > 1 )
			rtl_moveMemory( pBuf + offset + len, pBuf + offset, n * sizeof(sal_Char) );

		/* insert the new characters */
		n = len;
		if( len == 1 )
                            /* optimized for 1 character */
			pBuf[offset] = *str;
		else if( n > 1 )
			rtl_copyMemory( pBuf + offset, str, len * sizeof(sal_Char) );
		(*This)->length = nOldLen + len;
		pBuf[ nOldLen + len ] = 0;
	}
}