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From "Martin Sebor (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (STDCXX-60) std::istream::get(char*, size_type) doesn't store NUL on failure
Date Fri, 09 Dec 2005 01:31:09 GMT
     [ http://issues.apache.org/jira/browse/STDCXX-60?page=all ]
     
Martin Sebor resolved STDCXX-60:
--------------------------------

    Resolution: Fixed

Fixed. To be closed after a test exercising this has been added to the test suite.

> std::istream::get(char*, size_type) doesn't store NUL on failure
> ----------------------------------------------------------------
>
>          Key: STDCXX-60
>          URL: http://issues.apache.org/jira/browse/STDCXX-60
>      Project: STDCXX
>         Type: Bug
>   Components: 27. Input/Output
>     Versions: 4.1.2
>  Environment: all
>     Reporter: Martin Sebor
>     Assignee: Martin Sebor
>      Fix For: 4.1.3

>
> The program below aborts at runtime. According to http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#243,
> "...if the sentry constructor [of an unformatted input function] exits by throwing an
exception or if the sentry object returns false, when converted to a value of type bool, the
function returns without attempting to obtain any input. In either case [...] unformatted
input functions taking a character array of non-zero size as an argument shall also store
a null character (using charT()) in the first location of the array."
> $ cat t.cpp && nice make t -r && ./t
> #include <cassert>
> #include <sstream>
> int main ()
> {
>     std::istringstream strm;
>     strm.setstate (strm.failbit);
>     char s [3] = { 'x', 'y', 'z' };
>     strm.get (s, 2);
>     assert ('\0' == s [0]);
>     assert ('y'  == s [1]);
>     assert ('z'  == s [2]);
> }
> gcc -c -I/build/sebor/dev/stdlib/include/ansi -D_RWSTDDEBUG   -pthreads -D_RWSTD_USE_CONFIG
-I/build/sebor/gcc-3.4.3-15s/include -I/build/sebor/dev/stdlib/include -I/build/sebor/dev/stdlib/../rwtest
-I/build/sebor/dev/stdlib/../rwtest/include -I/build/sebor/dev/stdlib/tests/include  -pedantic
-nostdinc++ -g  -Wall -W -Wcast-qual -Winline -Wshadow -Wwrite-strings -Wno-long-long  t.cpp
> gcc t.o -o t -L/build/sebor/gcc-3.4.3-15s/rwtest -lrwtest15s -pthreads -L/build/sebor/gcc-3.4.3-15s/lib
-lstd15s  -lsupc++ -lm
> Assertion failed: '\0' == s [0], file t.cpp, line 13
> Abort (core dumped)

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