gecko-dev/build/wince/shunt/a2w.cpp

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * The contents of this file are subject to the Mozilla Public
 * License Version 1.1 (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * The Original Code is mozilla.org code, released
 * Jan 28, 2003.
 *
 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 2003 Netscape Communications Corporation. All
 * Rights Reserved.
 *
 * Contributor(s):
 *    Garrett Arch Blythe, 28-January-2003
 *
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU Public License (the "GPL"), in which case the
 * provisions of the GPL are applicable instead of those above.
 * If you wish to allow use of your version of this file only
 * under the terms of the GPL and not to allow others to use your
 * version of this file under the MPL, indicate your decision by
 * deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL.  If you do not delete
 * the provisions above, a recipient may use your version of this
 * file under either the MPL or the GPL.
 */

#include "mozce_internal.h"

int a2w_buffer(LPCSTR inACPString, int inACPChars, LPWSTR outWideString, int inWideChars)
{
    int retval = 0;
    
    /*
    **  Start off by terminating the out argument if appropriate.
    */
    if(NULL != outWideString && 0 != inWideChars)
    {
        *outWideString = L'\0';
    }
    
    /*
    **  Sanity check arguments.
    */
    if(NULL != inACPString && 0 != inACPChars && (0 == inWideChars || NULL != outWideString))
    {
        /*
        **  Attempt the conversion.
        */
        retval = MultiByteToWideChar(
                                     CP_ACP,
                                     0,
                                     inACPString,
                                     inACPChars,
                                     outWideString,
                                     inWideChars
                                     );
    }
    
    return retval;
}


LPWSTR a2w_malloc(LPCSTR inACPString, int inACPChars, int* outWideChars)
{
    LPWSTR retval = NULL;
    
    /*
    **  Initialize any out arguments.
    */
    if(NULL != outWideChars)
    {
        *outWideChars = 0;
    }
    
    /*
    **  Initialize the acp char length if requested.
    **  We do this here to avoid doing it twice in calls to a2w_buffer.
    */
    if(-1 == inACPChars)
    {
        if(NULL != inACPString)
        {
            /*
            **  Plus one so the terminating character is included.
            */
            inACPChars = (int)strlen(inACPString) + 1;
        }
        else
        {
            inACPChars = 0;
        }
    }
    
    /*
    **  Sanity check arguments.
    */
    if(NULL != inACPString && 0 != inACPChars)
    {
        int charsRequired = 0;
        
        /*
        **  Determine the size of buffer required for the conversion.
        */
        charsRequired = a2w_buffer(inACPString, inACPChars, NULL, 0);
        if(0 != charsRequired)
        {
            LPWSTR heapBuffer = NULL;
            
            heapBuffer = (LPWSTR)malloc((size_t)charsRequired * sizeof(WCHAR));
            if(NULL != heapBuffer)
            {
                int wideChars = 0;
                
                /*
                **  Real thing this time.
                */
                wideChars = a2w_buffer(inACPString, inACPChars, heapBuffer, charsRequired);
                if(0 != wideChars)
                {
                    retval = heapBuffer;
                    if(NULL != outWideChars)
                    {
                        *outWideChars = wideChars;
                    }
                }
                else
                {
                    /*
                    **  Something wrong.
                    **  Clean up.
                    */
                    free(heapBuffer);
                }
            }
        }
    }
    
    return retval;
}