Function msConvertWideStringToUTF8

mapstring.c:1719–1798

char* msConvertWideStringToUTF8 (const wchar_t* string, const char* encoding) {
#ifdef USE_ICONV

    char* output = NULL;
    char* errormessage = NULL;
    iconv_t cd = NULL;
    size_t nStr;
    size_t nInSize;
    size_t nOutSize;
    size_t iconv_status = -1;
    size_t nBufferSize;

    char* pszUTF8 = NULL;
    const wchar_t* pwszWide = NULL;

    if (string != NULL)
    {   
        nStr = wcslen (string);
        nBufferSize = ((nStr * 6) + 1);
        output = (char*) msSmallMalloc (nBufferSize);

        if (nStr == 0) {
            /* return an empty 8 byte string */
            output[0] = '\0';
            return output;
        }

        cd = iconv_open("UTF-8", encoding);
        
        nOutSize = nBufferSize;
        if ((iconv_t)-1 != cd)
        {  
            nInSize = sizeof (wchar_t)*nStr;
            pszUTF8 = output;
            pwszWide = string;
            iconv_status = iconv(cd, (char **)&pwszWide, &nInSize, &pszUTF8, &nOutSize);
            if ((size_t)-1 == iconv_status) {
                switch (errno) {
                    case E2BIG:
                    errormessage = "There is not sufficient room in buffer";
                    break;
                    case EILSEQ:
                    errormessage = "An invalid multibyte sequence has been encountered in the input";
                    break;
                    case EINVAL:
                    errormessage = "An incomplete multibyte sequence has been encountered in the input";
                    break;
                    default:
                    errormessage = "Unknown";
                    break;
                }
                msSetError(MS_MISCERR, "Unable to convert string in encoding '%s' to UTF8 %s",
                                       "msConvertWideStringToUTF8()",
                           encoding,errormessage);
                iconv_close(cd);
                msFree(output);
                return NULL;
            }