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Subject: [Bug 212983] strptime(3) doesn't increment pointer on parsing '%w'
 (weekday)
Date: Sun, 25 Sep 2016 10:58:47 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D212983

            Bug ID: 212983
           Summary: strptime(3) doesn't increment pointer on parsing '%w'
                    (weekday)
           Product: Base System
           Version: 11.0-RC1
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: grembo@FreeBSD.org

Created attachment 175152
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D175152&action=
=3Dedit
Patch to increment buf on parsing 'w'

strptime has a long standing bug that makes it fail to parse "%w" properly.

E.g.:
printf("%s", strptime("1970/01/01 00:00:00 4 UTC 123", "%Y/%m/%d %T %w UTC",
&tm));

Expected output: 123
Actual output: 4123

or

printf("%i", (int)strptime("4 1970", "%w %Y", &tm));

Expected output: Something >0
Actual output: 0

The attached patch aims to fix this problem.

Thanks to Nikola Kolev for reporting this problem.

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