[Chicken-janitors] #1014: posix: string->time preserves the year accross multiple invocations

[Chicken Trac]

#1014: posix: string->time preserves the year accross multiple invocations
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 Reporter:  certainty       |       Owner:       
     Type:  defect          |      Status:  new  
 Priority:  major           |   Milestone:  4.9.0
Component:  core libraries  |     Version:  4.8.x
 Keywords:                  |  
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 This bug has been reported by bryanvick.

 The following snippet reproduces the problem:

 #;1> (string->time "5/18" "%m/%d")
 #(0 0 0 18 4 0 5 137 #f 0)

 #;2> (string->time "5/18" "%m/%y")
 #(0 0 0 18 4 118 5 137 #f 0)

 #;3> (string->time "5/18" "%m/%d")
 #(0 0 0 18 4 118 5 137 #f 0)

 Though the first and the third call should return the same
 result, they don't. That's because the second call to string->time
 sets the year which is preserved in subsequent calls.

 First researches showed that the implementation of C_strptime passes a
 pointer to the global struct C_tm in the call to strptime(3), which
 doesn't reset the fields and so a few of them may remain
 unchanged. Possible fixes could be:

 1) use a fresh struct
 2) reset C_tm before it is used

-- 
Ticket URL: <http://bugs.call-cc.org/ticket/1014>
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