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manual: clarify that scanf %n supports type modifiers

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My initial reading of the %n documentation was that it didn't support
type conversions, because it only mentioned int*.

Corresponding man-pages patch:
https://lore.kernel.org/linux-man/20210328215509.31666-1-hi@alyssa.is/

Reviewed-by: Arjun Shankar <arjun@redhat.com>
This commit is contained in:
Alyssa Ross 2021-03-29 11:45:04 +00:00 committed by Arjun Shankar
parent 42624c7dc7
commit 4d8d70d301
1 changed files with 6 additions and 5 deletions
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11
manual/stdio.texi
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@ -3620,10 +3620,10 @@ function (@pxref{Parsing of Integers}) with the appropriate value
The @samp{%X} conversion is identical to the @samp{%x} conversion. They
both permit either uppercase or lowercase letters to be used as digits.
The default type of the corresponding argument for the @code{%d} and
@code{%i} conversions is @code{int *}, and @code{unsigned int *} for the
other integer conversions. You can use the following type modifiers to
specify other sizes of integer:
The default type of the corresponding argument for the @code{%d},
@code{%i}, and @code{%n} conversions is @code{int *}, and
@code{unsigned int *} for the other integer conversions. You can use
the following type modifiers to specify other sizes of integer:
@table @samp
@item hh
@ -3888,7 +3888,8 @@ The resulting pointer value is not guaranteed to be valid if it was not
originally written during the same program execution that reads it in.
The @samp{%n} conversion produces the number of characters read so far
by this call. The corresponding argument should be of type @code{int *}.
by this call. The corresponding argument should be of type @code{int *},
unless a type modifier is in effect (@pxref{Numeric Input Conversions}).
This conversion works in the same way as the @samp{%n} conversion for
@code{printf}; see @ref{Other Output Conversions}, for an example.