#define strnlen(x,y) strlen(x) > y ? y : strlen(x)
int main(void) {
int k;
char *tmp="hi hi hi";

 for (k = 0; k < strnlen (tmp, 8); k++) {
        if (tmp[k] == 0x0a)
          tmp[k] = 0;
        else if (tmp[k] == 0x0d)
          tmp[k] = 0;
        else if (tmp[k] == 0x09)
          tmp[k] = 0x20;
                printf("%d\t%d\n",k, strnlen (tmp, 8));
      }
}