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Posted to issues@stdcxx.apache.org by "Farid Zaripov (JIRA)" <ji...@apache.org> on 2008/02/26 15:46:51 UTC
[jira] Closed: (STDCXX-250) std::operator>>(istream&, string&)
fails to set failbit after it extracts 0 characters
[ https://issues.apache.org/jira/browse/STDCXX-250?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Farid Zaripov closed STDCXX-250.
--------------------------------
Closing the resolved issue.
> std::operator>>(istream&, string&) fails to set failbit after it extracts 0 characters
> --------------------------------------------------------------------------------------
>
> Key: STDCXX-250
> URL: https://issues.apache.org/jira/browse/STDCXX-250
> Project: C++ Standard Library
> Issue Type: Bug
> Components: 21. Strings
> Affects Versions: 4.1.2, 4.1.3
> Environment: all
> Reporter: Martin Sebor
> Assignee: Farid Zaripov
> Priority: Minor
> Fix For: 4.2.1
>
> Attachments: istream.cc.diff
>
>
> 21.3.7.9, p3 says about the string extractor: "If the function extracts no characters, it calls is.setstate(ios::failbit), which may throw ios_base::failure (27.4.4.3)." The test program below shows that in unbuffered mode stdcxx fails to do so when an exception is thrown during the third call to underflow().
> $ cat v.cpp && make v && ./v
> #include <cassert>
> #include <cstdio>
> #include <istream>
> #include <string>
> int main ()
> {
> struct: std::streambuf {
> int_type underflow () {
> static int i = 0;
> // i == 0: sgect() invoked from sentry ctor
> // i == 1: sgetc() invoked from operator>>()
> // i == 2: sbumpc() invoked from operator>>()
> return 1 < i++ ? throw i : 'x';
> }
> } buf;
> std::istream is (&buf);
> std::string s;
> is >> s;
> std::printf ("state = %c%c%c, string = \"%s\" (length %u)\n",
> is.rdstate () & is.badbit ? 'B' : '-',
> is.rdstate () & is.eofbit ? 'E' : '-',
> is.rdstate () & is.failbit ? 'F' : '-',
> s.c_str (), s.size ());
> assert ("x" == s);
> assert ((is.failbit | is.badbit) == is.rdstate ());
> }
> gcc -c -I/build/sebor/dev/stdlib/include/ansi -D_RWSTDDEBUG -pthreads -D_RWSTD_USE_CONFIG -I/build/sebor/dev/stdlib/include -I/build/sebor/gcc-4.1.0-15s/include -I/build/sebor/dev/stdlib/../rwtest -I/build/sebor/dev/stdlib/../rwtest/include -I/build/sebor/dev/stdlib/tests/include -pedantic -nostdinc++ -g -W -Wall -Wcast-qual -Winline -Wshadow -Wwrite-strings -Wno-long-long v.cpp
> gcc v.o -o v -L/build/sebor/gcc-4.1.0-15s/rwtest -lrwtest15s -pthreads -L/build/sebor/gcc-4.1.0-15s/lib -lstd15s -lsupc++ -lm
> state = B--, string = "x" (length 1)
> Assertion failed: (is.failbit | is.badbit) == is.rdstate (), file v.cpp, line 30
> Abort (core dumped)
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