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manual: clarify that scanf %n supports type modifiers 

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 The @samp{%X} conversion is identical to the @samp{%x} conversion. They
both permit either uppercase or lowercase letters to be used as digits. both permit either uppercase or lowercase letters to be used as digits.
The default type of the corresponding argument for the @code{%d} and The default type of the corresponding argument for the @code{%d},
@code{%i} conversions is @code{int *}, and @code{unsigned int *} for the @code{%i}, and @code{%n} conversions is @code{int *}, and
other integer conversions. You can use the following type modifiers to @code{unsigned int *} for the other integer conversions. You can use
specify other sizes of integer: the following type modifiers to specify other sizes of integer:
@table @samp @table @samp
@item hh @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. originally written during the same program execution that reads it in.
The @samp{%n} conversion produces the number of characters read so far 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 This conversion works in the same way as the @samp{%n} conversion for
@code{printf}; see @ref{Other Output Conversions}, for an example. @code{printf}; see @ref{Other Output Conversions}, for an example.