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printf.3: Clarify details of the %n conversion specifier 

See http://bugs.debian.org/756602

Reported-by: Jakub Wilk <jwilk@debian.org>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2014-07-31 12:29:12 +02:00
parent 8ee1a15c1b
commit aacd17b1c1
1 changed files with 8 additions and 6 deletions
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14
man3/printf.3
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@ -332,9 +332,7 @@ For other conversions, the behavior is undefined.
.B \-
The converted value is to be left adjusted on the field boundary.
(The default is right justification.)
Except for
.B n
conversions, the converted value is padded on the right with blanks, rather
The converted value is padded on the right with blanks, rather
than on the left with blanks or zeros.
A
.B \-
@ -788,10 +786,14 @@ or
.TP
.B n
The number of characters written so far is stored into the integer
indicated by the
.I "int\ *"
(or variant) pointer argument.
pointed to by the corresponding argument.
That argument shall be an
.I "int\ *",
or variant whose size matches the (optionally)
supplied integer length modifier.
No argument is converted.
The behavior is undefined if the conversion specification includes
any flags, a field width, or a precision.
.TP
.B m
(Glibc extension.)