Implementation errors in strtol()

[Andrey Chernov]

On Thu, Jan 20, 2005 at 08:23:24PM +0100, Joerg Wunsch wrote:
> While the standard explicitly states that empty (or whitespace-only)
> input strings cause an empty subject sequence, which will in turn
> cause no conversion to be performed, single signs ("+" or "-") would
> contain a non-empty subject sequence, so a conversion has to take
> place.  FreeBSD erroneously returns EINVAL in that case.  As EINVAL is

Just what is eye-catching:

+- can't be compared to whitespace at all. Whitespace is not subject 
sequence (2) but initial sequence (1) according to POSIX.

Moreover, POSIX clearly allows EINVAL for strtol():
"If no conversion could be performed, 0 shall be returned and errno may 
be set to [EINVAL]"

Reading POSIX will really help you with this issue.

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