Harti Brandt wrote: > When applying "%*d%d" to the string "123" the first 'd' format matches > the string "123" and the conversion yields the number 123. This is then > thrown away because assignment is suppressed. The next format specified > finds an EOF condition on the stream so this counts as an input error > according to paragraph 9, last sentence of 22.214.171.124. > > According to to paragraph 18 ("The fscanf function returns the value of > the macro EOF if an input failure occurs before any conversion. Otherwise, > the function returns the number of input items assigned, which can be > fewer than provided for, or even zero, in the event of an early matching > failure.") the function returns 0, because there was a succesful > conversion but no assignment.
Paragraph 6 of: http://www.opengroup.org/onlinepubs/007904975/functions/sscanf.html Implies that the lack of characters in the string following the conversion, due to failure in assignment, should result in an "Input failure". Note also that stdio.h defines EOF as -1. I think it can be interpreted either way, still. > I just had a look at the v7 implementation. In this implementation a > suppressed assignment is not counted as a match even if the > match was successful. This explains the return of -1 if the first > not-suppressed conversion failes. > > I think changing current behaviour would be a regression with regard to > ISO-C (and Posix). I really hate the idea of "conforming to Linux"; if I wanted to run Linux, I'd run Linux. On the other hand, there's a lot to be said for least common denominator, and it's not like Linux' "great idea" of updating the select struct timeval here: pretty much everyone has the same behaviour as Linux, which is to say, -1. I think with a suppressed assignment, it's simply not possible to distinguish an error return from an EOF return, which really makes me tempted to say "return -1". -- Terry _______________________________________________ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "[EMAIL PROTECTED]"