[Bug stdio/12701] scanf accepts non-matching input

[macro at orcam dot me.uk]

https://sourceware.org/bugzilla/show_bug.cgi?id=12701

Maciej W. Rozycki <macro at orcam dot me.uk> changed:

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                 CC|                            |macro at orcam dot me.uk

--- Comment #30 from Maciej W. Rozycki <macro at orcam dot me.uk> ---
(In reply to Rich Felker from comment #0)
> sscanf("abc", "%4c", buf) returns 1 instead of 0 or EOF (not sure which is
> correct) and leaves no way for the caller to know buf[3] is unfilled.
FYI the way to determine that for "%c" is via "%n", e.g.:

int count;
sscanf("abc", "%4c%n", buf, &count);

and you'll get 3 in "count" as expected, so you know buf[3] has been left
untouched.  Though I also read the standard as requiring this case to be
a matching failure.

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