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libcxx: Fix for basic_stringbuf::seekoff() after r320604.

Authored by pcc on Dec 15 2017, 6:10 PM.



As a result of this change, the basic_stringbuf constructor that
takes a mode ends up leaving hm_ set to 0, causing the comparison
hm_ - < noff" in seekoff() to succeed, which caused
the function to incorrectly return -1. The fix is to account for the
possibility of hm_ being 0 when computing the distance from hm_
to the start of the string.

Event Timeline

pcc created this revision.Dec 15 2017, 6:10 PM
mclow.lists added inline comments.Dec 19 2017, 2:49 PM

This can be const.

pcc updated this revision to Diff 127609.Dec 19 2017, 3:24 PM
  • Make __hm const
mclow.lists accepted this revision.Dec 19 2017, 3:29 PM

LGTM. I'm going to sprinkle const throughout this file later, but that is a drive-by thing.
All the lines that start out ptrdiff_t __hm = will soon be const ptrdiff_t __hm = ,
but that's not necessary for this bug fix.

This revision is now accepted and ready to land.Dec 19 2017, 3:29 PM
This revision was automatically updated to reflect the committed changes.
pcc marked an inline comment as done.