int hexchk(char *chr) {
int c;
while (*chr != '\0') {
c=*chr++;
//printf("%d,%c%x\r\n", c,c,c);
//if (c == ' ') continue;
//else if (c >= '0' && c <= '9') continue;
//else if (c >= 'a' && c <= 'f') continue;
//else if (c >= 'A' && c <= 'F') continue;
if (c >= '0' && c <= '9') continue;
else return 1;
}
return 0;
}