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4b54e0fc2a
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_ - __str_.data() < __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. Differential Revision: https://reviews.llvm.org/D41319 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@321124 91177308-0d34-0410-b5e6-96231b3b80d8