What does this char string related piece of C++ code do?

bool check(const char *text) {
    char c;
    while (c=*text++) {
        if ((c&0x80)&&((*text) & 0x80)) {
            return true;
        }
    }
    return false;
}

What’s 0x80 and the what does the whole mysterious function do?

>Solution :

rewriting to be less compact

   while (true)
   {
       char c = *text;
       text += 1;
       if (c=='\0') // at the end of string?
          return false;
       int temp1 = c & 0x80; // test MSB of c
       int temp2 = (*text) & 0x80; // test MSB of next character
       if(temp1 != 0 && temp2 != 0) // if both set the return true
          return true;
    }

MSB means Most Significant Bit. Bit7. Zero for plain ascii characters