libstdc++/2259: istream::tellg/seekg cause character loss

[hhuang@cs.columbia.edu]

>Number:         2259
>Category:       libstdc++
>Synopsis:       istream::tellg/seekg cause character loss
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Mar 10 20:36:00 PST 2001
>Closed-Date:
>Last-Modified:
>Originator:     Hao Huang
>Release:        unknown-1.0
>Organization:
>Environment:
~>gcc -v
Reading specs from /usr/lib/gcc-lib/i686-pc-cygwin/2.95.2-6/specs
gcc version 2.95.2-6 19991024 (cygwin experimental)
>Description:
istream::tellg causes character loss while using getline(string &).  istream::seekg with the saved value will result in one character beyond the saved position.
>How-To-Repeat:
This can be demostrated with the attach code and a file with the following 2 lines (the content seem to have an impact on the result):

line1	aaaaaaaa	bbbbbbbb	ccccccccc
line2	dddddddd

The running result is as follows:

0: line1        aaaaaaaa        bbbbbbbb        ccccccccc
gcount = 0
remember 36
0: [ine2        dddddddd]
restore 37
1: [ne2 dddddddd]
>Fix:
No idea yet.
>Release-Note:
>Audit-Trail:
>Unformatted: