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From "Martin Sebor (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (STDCXX-1026) sgetn() fails to extract characters from an unbuffered stream
Date Thu, 04 Dec 2008 21:58:44 GMT

     [ https://issues.apache.org/jira/browse/STDCXX-1026?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Martin Sebor resolved STDCXX-1026.
----------------------------------

    Resolution: Fixed

Fixed in [r723461 | http://svn.apache.org/viewvc?rev=723461&view=rev].
Test passes. Will close after merging out to 4.3.0 and trunk.

> sgetn() fails to extract characters from an unbuffered stream
> -------------------------------------------------------------
>
>                 Key: STDCXX-1026
>                 URL: https://issues.apache.org/jira/browse/STDCXX-1026
>             Project: C++ Standard Library
>          Issue Type: Bug
>          Components: 27. Input/Output
>    Affects Versions: 4.2.1
>            Reporter: Martin Sebor
>            Assignee: Martin Sebor
>             Fix For: 4.2.2
>
>   Original Estimate: 2h
>          Time Spent: 2h
>  Remaining Estimate: 0h
>
> This bug was uncovered in this [discussion | http://forums.sun.com/thread.jspa?messageID=10532349]:
> {noformat}
> $ cat t.cpp && make t && ./t
> #include <cassert>
> #include <istream>
> #include <streambuf>
> int main ()
> {
>     static int x = '0';
>     struct: std::streambuf {
>         // unbuffered, always successfully reads one character
>         int_type underflow () { return x++; }
>     } sb;
>     // "endless" stream that never reaches EOF
>     std::istream endless (&sb);
>     char s [4] = "";
>     endless.read (s, sizeof s);
>  
>     // expect to extract as many characters as requested
>     assert (endless.good ());
>     assert (sizeof s == endless.gcount ());
>     assert ('0' == s [0] && '1' == s [1] && '2' == s [2] && '3'
== s [3]);
>     
> }
> gcc -c -I/home/sebor/stdcxx-4.2.1/include/ansi \
>        -I/home/sebor/stdcxx-4.2.1/include \
>        -I/build/sebor/stdcxx-4.2.1-gcc-4.3.0-8D/include \
>        -I/home/sebor/stdcxx-4.2.1/examples/include \
>        -pedantic -nostdinc++ -O2   -W -Wall \
>        -Wcast-qual -Winline -Wshadow -Wwrite-strings -Wno-long-long -Wcast-align   t.cpp
> t.cpp: In function 'int main()':
> t.cpp:9: warning: inlining failed in call to 'virtual main()::<anonymous struct>::~._26()':
call is unlikely and code size would grow
> t.cpp:24: warning: called from here
> t.cpp:9: warning: inlining failed in call to 'virtual main()::<anonymous struct>::~._26()':
call is unlikely and code size would grow
> t.cpp:24: warning: called from here
> gcc t.o -o t  -L/build/sebor/stdcxx-4.2.1-gcc-4.3.0-8D/lib  -Wl,-R/build/sebor/stdcxx-4.2.1-gcc-4.3.0-8D/lib
-lstd8D -lsupc++ -lm 
> t: t.cpp:22: int main(): Assertion `endless.good ()' failed.
> Aborted
> {noformat}

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