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The proper handling of cases 2 and 4 still need some improvement, perhaps with errno assignment or with changing the interface to something akin to strtol or, if C++ is allowed, throwing an exception. Also it might make sense to handle integer overflow errors.

The proper handling of cases 2 and 4 still need some improvement, perhaps with errno assignment or by changing the interface to something akin to strtol or, if C++ is allowed, by throwing an exception. Also it might make sense to handle integer overflow errors.

The proper handling of cases 2 and 4 still need some improvement, perhaps with errno assignment or with changing the interface to something akin to strtol or, if C++ is allowed, throwing an exception.

The proper handling of cases 2 and 4 still need some improvement, perhaps with errno assignment or with changing the interface to something akin to strtol or, if C++ is allowed, throwing an exception. Also it might make sense to handle integer overflow errors.

The proper handling of cases 2 and 4 still need some improvement, perhaps with errno assignment or, if C++ is allowed, throwing an exception.

The proper handling of cases 2 and 4 still need some improvement, perhaps with errno assignment or with changing the interface to something akin to strtol or, if C++ is allowed, throwing an exception.