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Clarify that scanf does not use character classes. Fixes bug 12986

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Update documentation to say that scanf ("%[[:alpha:]]", c) does not read
alphabetic characters but is parsed literarily.
This commit is contained in:
Ondřej Bílka 2013-12-23 17:44:47 +01:00
parent fb55fcd21a
commit 9878ad4690
1 changed files with 5 additions and 1 deletions
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6
manual/stdio.texi
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@ -3672,7 +3672,7 @@ of the width or precision by @code{MB_CUR_MAX}.
To read in characters that belong to an arbitrary set of your choice,
use the @samp{%[} conversion. You specify the set between the @samp{[}
character and a following @samp{]} character, using the same syntax used
in regular expressions. As special cases:
in regular expressions for explicit sets of characters. As special cases:
@itemize @bullet
@item
@ -3692,6 +3692,10 @@ the characters listed.
The @samp{%[} conversion does not skip over initial whitespace
characters.
Note that the @dfn{character class} syntax available in character sets
that appear inside regular expressions (such as @samp{[:alpha:]}) is
@emph{not} available in the @samp{%[} conversion.
Here are some examples of @samp{%[} conversions and what they mean:
@table @samp