Re: libstdc++/5816: Severe problems with locales (reading doubles)

Re: libstdc++/5816: Severe problems with locales (reading doubles)

[paolo]

Synopsis: Severe problems with locales (reading doubles)

Responsible-Changed-From-To: unassigned->paolo
Responsible-Changed-By: paolo
Responsible-Changed-When: Sun Mar  3 15:35:56 2002
Responsible-Changed-Why:
    Analyzed.
State-Changed-From-To: open->analyzed
State-Changed-By: paolo
State-Changed-When: Sun Mar  3 15:35:56 2002
State-Changed-Why:
    Confirmed. Patch in progress.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=5816

Re: libstdc++/5816: Severe problems with locales (reading doubles)

[paolo]

Synopsis: Severe problems with locales (reading doubles)

State-Changed-From-To: analyzed->closed
State-Changed-By: paolo
State-Changed-When: Tue Mar  5 04:13:24 2002
State-Changed-Why:
    Fixed mainline and (shortly) 3_1 branch with:
    http://gcc.gnu.org/ml/libstdc++/2002-03/msg00017.html

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=5816

libstdc++/5816: Severe problems with locales (reading doubles)

[Peter Schmid]

>Number:         5816
>Category:       libstdc++
>Synopsis:       Severe problems with locales (reading doubles)
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Mar 03 08:26:00 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     Peter Schmid
>Release:        3.1 20020302 (prerelease)
>Organization:
TU Darmstadt
>Environment:
System: Linux kiste 2.4.17 #7 Thu Jan 3 17:21:51 CET 2002 i686 unknown
Architecture: i686
GNU ld version 2.11.93.0.2 20020207
glibc 2.2.4 + patches
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: ../gcc/configure --enable-shared --disable-nls --enable-threads --enable-languages=c,c++,f77,objc
>Description:
When the following program t is run, the input 123456.7 is
processed correctly only if the locale for input is set to C. If it is
set to de_DE and the comma is used as the decimal point as specified
by the German locale, strange things happen and the bad bit is
set. It seems that there is a problem with rounding and the width of
the input field. This critical bug makes reliable parsing of floating point
numbers impossible. (LANG was set to C during the program runs.)  
>How-To-Repeat:
Source code t.C

#include <iostream>
#include <locale>
#include <string>
#include <cstdlib>
using namespace std;

int main()
{
  cout << "Locale for input: ";
  string s;
  cin >> s;
  if (!cin) return EXIT_FAILURE;
  locale cinLocale(s.c_str());

  cin.imbue(cinLocale);
  double value;
  while (cin >> value) {
    cout << value << endl;
  }
  cout<<"rdstate after reading from cin : "
      << cin.rdstate() << endl;
  cout<<"good eof fail bad "
      << ios::goodbit << " "
      << ios::eofbit << " "
      << ios::failbit << " "
      << ios::badbit << endl;
}

g++ -v -o t t.C -W -Wall
Reading specs from /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1/specs
Configured with: ../gcc/configure --enable-shared --disable-nls --enable-threads --enable-languages=c,c++,f77,objc
Thread model: posix
gcc version 3.1 20020302 (prerelease)
 /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1/cc1plus -v -D__GNUC__=3 -D__GNUC_MINOR__=1 -D__GNUC_PATCHLEVEL__=0 -D__ELF__ -Dunix -Dlinux -D__ELF__ -D__unix__ -D__linux__ -D__unix -D__linux -Asystem=posix -D__NO_INLINE__ -D__STDC_HOSTED__=1 -D_GNU_SOURCE -Acpu=i386 -Amachine=i386 -Di386 -D__i386 -D__i386__ -D__tune_i686__ -D__tune_pentiumpro__ t.C -D__GNUG__=3 -D__DEPRECATED -D__EXCEPTIONS -D__GXX_ABI_VERSION=100 -quiet -dumpbase t.C -W -Wall -version -o /tmp/cc9F9HCH.s
GNU CPP version 3.1 20020302 (prerelease) (cpplib) (i386 Linux/ELF)
GNU C++ version 3.1 20020302 (prerelease) (i686-pc-linux-gnu)
	compiled by GNU C version 3.1 20020302 (prerelease).
ignoring nonexistent directory "NONE/include"
ignoring nonexistent directory "/usr/local/i686-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/include/g++-v3
 /usr/local/include/g++-v3/i686-pc-linux-gnu
 /usr/local/include/g++-v3/backward
 /usr/local/include
 /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1/include
 /usr/include
End of search list.
 /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1/../../../../i686-pc-linux-gnu/bin/as -V -Qy -o /tmp/ccM03p7e.o /tmp/cc9F9HCH.s
GNU assembler version 2.11.93.0.2 (i686-pc-linux-gnu) using BFD version 2.11.93.0.2 20020207
 /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1/collect2 --eh-frame-hdr -m elf_i386 -dynamic-linker /lib/ld-linux.so.2 -o t /usr/lib/crt1.o /usr/lib/crti.o /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1/crtbegin.o -L/usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1 -L/usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1/../../../../i686-pc-linux-gnu/lib -L/usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1/../../.. /tmp/ccM03p7e.o -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.1/crtend.o /usr/lib/crtn.o

./t
Locale for input: C
123456.7
123457 
[^D]
rdstate after reading from cin : 6
good eof fail bad 0 2 4 1
./t
Locale for input: de_DE
1,54
1.54
123456,7
rdstate after reading from cin : 4
good eof fail bad 0 2 4 1
>Fix:
	
>Release-Note:
>Audit-Trail:
>Unformatted: