Description

   The atoq (or atoll) function converts the initial portion of
   a string to its decimal __int64 value. This function does not
   account for overflows resulting from the conversion. The string
   to be converted has the following format:

   [white-spaces][+|-]digits

   The function call atoq (str) is equivalent to strtoq (str,
   (char**)NULL, 10), except for the behavior on error.