字符编码转换函数linux通用

/**
 * FormatConversion  字符编码格式转换
 * @param from_charset        转化前格式
 * @param sourcebuf            转化后格式
 * @param sourcebuf            源包缓冲区
 * @param sourcelen                源包长度
 * @param destbuf                目标缓冲区
 * @param destlen                目标长度
 * @@return                            无返回
 */
int FormatConversion(char*from_charset,char*to_charset,char *sourcebuf,size_t sourcelen,char *destbuf,size_t destlen)
{
    iconv_t cd;
    if( (cd = iconv_open(to_charset,from_charset)) ==0 )
    {
        printf("iconv_open error \n");
        return -1;
    }
    memset(destbuf,0,destlen);
    char **source = &sourcebuf;
    char **dest = &destbuf;

    if(-1 == iconv(cd,source,&sourcelen,dest,&destlen))
    {
        printf("iconv error \n");
        iconv_close(cd);
        return -1;
    }
    iconv_close(cd);
    printf("sourcelen = %d destlen = %d\n",sourcelen,destlen);
    return 0;
}