C++检测标点符号

下面是关于C++如何检测标点符号的，无论中文还是英文标点，这里能检测到的中文标点符号为GB2312编码格式的

BOOL isText(string cStrName)
{
    const char *str=cStrName.c_str();
    char ch = *str++;
    int i=1;
    if(!(ch=='_' || ((ch & 0x80)&&(*str& 0x80)) || isalpha(ch)))
    {
        return FALSE;
    }
    if ((ch&0xff)==0xA1 && (*str& 0x80)>=0x3F)
    {
        return FALSE;
    }
    else if((ch&0xff)>0xA1 && (ch&0xff)<0xAA)
    {
        return FALSE;
    }
    else if ((ch&0xff)==0xAA && (*str& 0x80)<=0x40)
    {
        return FALSE;
    }
    if (ch<0)
    {
        *str++;
        i++;
    }
    int len = (int)strlen(cStr);
    for(i;i     {
        ch = *str++;
        if(!(ch=='_' || ch=='-'|| (ch & 0x80) || isalpha(ch) || isdigit(ch)))
        {
            return FALSE;
        }
        if (i         {
            if ((ch&0xff)==0xA1 && (*str& 0x80)>=0x3F)
            {
                return FALSE;
            }
            else if((ch&0xff)>0xA1 && (ch&0xff)<0xAA)
            {
                return FALSE;
            }
            else if ((ch&0xff)==0xAA && (*str& 0x80)<=0x40)
            {
                return FALSE;