Cannot handle UINT_MAX

[GoogleCodeExporter]

The function evcpe_type_validate() cannot handle the UINT_MAX 4294967295 number.
In order to reproduce, try to make a call to evcpe_attr_set() on an unsignedInt 
pareameter. The following message will be displayed:
not a positive integer: -1.

I've patched the function in order to use the strtoul() but with more check as 
suggested in one  of the site that I've visited:

int evcpe_strtoul(const char *str, int base, unsigned long *ul)
{
   char          *bad_char = NULL;
   unsigned long num = 0;

   if (!str || !ul || (base > 36) || (base < 0))
   {
      return -1;
   }

   errno = 0;
   num = strtoul(str, &bad_char, base);
   if(ERANGE == errno)
   {
      if((0 == num) && (str == bad_char))
      {
         evcpe_error(__func__, "cannot convert the string: %s", str);
      }
      else if(ULONG_MAX == num)
      {
         evcpe_error(__func__, "an overflow has been detected");
      }
   }
   else if((0 == errno) && ((NULL != bad_char) && ('\0' == *bad_char)))
   {
      *ul = num;
      return 0;
   }

   evcpe_error(__func__, "cannot convert the string: %s", str);

   return -1;
}

Original issue reported on code.google.com by [email protected] on 29 Aug 2011 at 1:18