On Sat, Sep 27, 2008 at 08:34:04PM +0200, Johannes Sixt wrote:
> On Samstag, 27. September 2008, Dmitry Potapov wrote:
> > +static inline int get_file_attr(const char *fname,
> > WIN32_FILE_ATTRIBUTE_DATA *fdata) +{
> > + if (GetFileAttributesExA(fname, GetFileExInfoStandard, fdata))
> > + return 0;
> > +
> > + switch (GetLastError()) {
> > + case ERROR_ACCESS_DENIED:
> > + case ERROR_SHARING_VIOLATION:
> > + case ERROR_LOCK_VIOLATION:
> > + case ERROR_SHARING_BUFFER_EXCEEDED:
> > + return EACCES;
> > + case ERROR_BUFFER_OVERFLOW:
> > + return ENAMETOOLONG;
> > + case ERROR_NOT_ENOUGH_MEMORY:
> > + return ENOMEM;
> > + default:
> > + return ENOENT;
> > + }
> > +}
>
> I've long wished for a function that translates Win32 error codes to errno
> codes. It would be useful in a number of other places, too.
>
> Here you introduce a new function get_file_attr() that is nothing but
> GetFileAttributesExA() followed by such an error code translation.
>
> I suggest that we leave the original call to GetFileAttributesExA() alone and
> have a function win32_to_errno(void) that is just the switch statement above.
win32_to_errno was the first thing that implemented but then released
that translation of Win32 errors to errno cannot be in general case.
For instance, ERROR_BUFFER_OVERFLOW means ENAMETOOLONG here, but it
can be translated to ETOOSMALL in other cases. How do you propose to
deal with that?
So I have not found a better solution than to add get_file_attr(), which
calls GetFileAttributesExA() and translates Win32 error.
Dmitry
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