uptime function

[Usurpator]

I'm working on a KDE toolbar applet showing the current system uptime. Am I 
allowed to use code from the GNU uptime 2.0 program? I will off-course 
mention the original authors. The program will be distributed as free 
software under the GPL.

q
BTW:  in uptime.c, print_uptime:
      setlocale (LC_NUMERIC, "C");
      res = sscanf (buf, "%lf", &upsecs);
      setlocale (LC_NUMERIC, "");
      if (res == 1)
        uptime = (time_t) upsecs;
Why don't do this?:
      setlocale (LC_NUMERIC, "C");
      if (sscanf (buf, "%lf", &upsecs))
        uptime = (time_t) upsecs;
      setlocale (LC_NUMERIC, "");