Re: Locale problem / debugging libstdc++

["Jens Berlips" <jens dot berlips at gmail dot com>]

Hi,

Status update,

I didn't have time to look into this too deep into my previous matter
so I downgraded my system and the locale works smoothly.

Now I have come to a problem with the money_get facet and made a
sample program displaying my problems (see below).

In the output you can see:
"123,00" - error parsing:  (state==6) parsed=
"123,00 " = 12300

What is the problem here? Why does money_get need an ending space?

Thank you in advance,

BRGDS,
Jens Berlips




============== c++ code ================

#include <stdio.h>
#include <stdlib.h>
#include <locale>
#include <errno.h>
#include <iostream>
#include <sstream>


void output(const std::string &strinp)
{


       std::cout << """ << strinp << "\"";
   #ifdef WIN32
       std::locale loc = std::locale("Swedish_sweden.OCP");
   #else
       std::locale loc("sv_SE");
   #endif


       std::ios_base::iostate state = std::ios_base::goodbit;
       std::string str;

       typedef std::istreambuf_iterator<char> iter_t;

// input


       std::istringstream stream(strinp);
       stream.imbue(loc);
//      stream.setf(std::ios_base::showbase); // showbase is set =>
base is not optional.

       std::istream::sentry guard(stream);

       if(guard)
       {

   // iterators:
           iter_t eos;
           iter_t bos(stream);

           const std::money_get<char> &mp =
std::use_facet<std::money_get<char> >(loc);
           iter_t end1 = mp.get(bos, eos, false, stream, state, str);

           if(state ==0 || state == std::ios_base::eofbit)
           {
                   long int i = strtol(str.c_str(), 0,0);
                   if(errno == ERANGE)
                   {
                           std::cout << " - error strotl" << std::endl;;
                   } else {
                           std::cout << " = " << i << std::endl;
                   }
           } else {
                   std::cout << " - error parsing: " << str << "
(state==" << state << ") parsed=" << str << std::endl;
           }

       } else {

           std::cout << "sentry failed" << std::endl;
       }
}

int main(int argv, char **argc)
{

       output("123,00 kr");
       output("123,00");
       output("123,00 ");
       output("123");
       output("123 ");
       output(",10");
       output(",10 kr");
       output("0,12");
       output("0,12 kr");


       int a;
       std::cin >> a;

       return 1;
}

/* visual studio .net 8.0 output:
"123,00 kr" = 12300
"123,00" = 12300
"123,00 " = 12300
"123" = 12300
"123 " = 12300
",10" = 10
",10 kr" = 10
"0,12" = 10
"0,12 kr" = 10

(bugs here include invalid iterator dereferencing, but it gets the
money correctly/

gcc version 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)
with: libstdc++6-4.1-dev             4.1.1-21

"123,00 kr" = 12300
"123,00" - error parsing:  (state==6) parsed=
"123,00 " = 12300
"123" - error parsing:  (state==6) parsed=
"123 " - error parsing:  (state==6) parsed=
",10" - error parsing:  (state==6) parsed=
",10 kr" = 10
"0,12" - error parsing:  (state==6) parsed=
"0,12 kr" = 12

*/





======================================



On 6/21/07, Jens Berlips <jens.berlips@gmail.com> wrote:
> Hi All,
>
> I recently updated gcc to the newest version in debian unstable and
> suddenly all c++ locale stopped working but the old-fashion c-api
> still works.
>
> OK
> ==
> p = setlocale(LC_ALL, "en_US");
> lc = localeconv();
> std::cout << lc->decimal_point << std::endl;
>
> NOT OK (throws runtime_error)
> =======================
> std::locale loc("en_US");
> output: [[
>    terminate called after throwing an instance of 'std::runtime_error'
>      what():  locale::facet::_S_create_c_locale name not valid
>    Aborted
> ]]
>
> What am I doing wrong with my locales?
>
> OBS: std::locale loc("C") is also ok.
>
> System info
> =========
>  The output of "locale -a" includes "en_US", it has been generated
> using locale-gen, the gcc-4.1-locales, and gcc-4.2-locales packages
> are both installed.
>
> I have tried:
> ii  g++-4.1                         4.1.2-12
>  The GNU C++ compiler
> ii  g++-4.2                        4.2-20070609-1
> The GNU C++ compiler
> (for an output of g++ -v see (3) below)
>
> They both give the same problem. For an output of "ldd"  see (1) below.
>
> The source code of my test application h1.cpp can be seen below (2).
>
> Debugging libstdc++
> ===============
> I have tried to debug the libstdc++ library, but gdb doesn't allow me
> to step inside the libstdc++ library functions (ex. std::locale
> constructor), im using:
>         g++ -D_GLIBCXX_DEBUG -g -Wall h1.cpp -o h1
> to compile my program.
>
> The debug library has been installed.
> ii  libstdc++6-4.1-dbg             4.1.2-12
> The GNU Standard C++ Library v3 (debugging f
>
> What is the correct way to compile my program to be able to debug
> "inside" libstdc++, that is, not only the headers (then -g is enough)?
>
> Thanks in advance!
>
>
> Best regards,
> Jens
>
>  ==========================================
>
> ---- (1) ----
>
>  ldd -v ./h1
>         linux-gate.so.1 =>  (0xffffe000)
>         libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0xb7e94000)
>         libm.so.6 => /lib/libm.so.6 (0xb7e6d000)
>         libgcc_s.so.1 => /lib/libgcc_s.so.1 (0xb7e62000)
>         libc.so.6 => /lib/libc.so.6 (0xb7d1f000)
>         /lib/ld-linux.so.2 (0xb7f88000)
>
>         Version information:
>         ./h1:
>                 libgcc_s.so.1 (GCC_3.0) => /lib/libgcc_s.so.1
>                   libstdc++.so.6 (CXXABI_1.3) => /usr/lib/libstdc++.so.6
>                 libstdc++.so.6 (GLIBCXX_3.4) => /usr/lib/libstdc++.so.6
>                 libc.so.6 (GLIBC_2.0) => /lib/libc.so.6
>                  libc.so.6 (GLIBC_2.1.3) => /lib/libc.so.6
>                 libc.so.6 (GLIBC_2.2) => /lib/libc.so.6
>         /usr/lib/libstdc++.so.6:
>                 ld-linux.so.2 (GLIBC_2.3) => /lib/ld-linux.so.2
>                 libgcc_s.so.1 (GLIBC_2.0) => /lib/libgcc_s.so.1
>                 libgcc_s.so.1 (GCC_3.3) => /lib/libgcc_s.so.1
>                 libgcc_s.so.1 (GCC_3.0) => /lib/libgcc_s.so.1
>                 libc.so.6 (GLIBC_2.3) => /lib/libc.so.6
>                 libc.so.6   (GLIBC_2.1) => /lib/libc.so.6
>                 libc.so.6 (GLIBC_2.1.3) => /lib/libc.so.6
>                 libc.so.6 (GLIBC_2.2) => /lib/libc.so.6
>                 libc.so.6 (GLIBC_2.0) => /lib/libc.so.6
>         /lib/libm.so.6:
>                 ld-linux.so.2 (GLIBC_PRIVATE) => /lib/ld-linux.so.2
>                 libc.so.6 (GLIBC_2.1.3) => /lib/libc.so.6
>                 libc.so.6 (GLIBC_2.0) => /lib/libc.so.6
>         /lib/libgcc_s.so.1:
>                 libc.so.6 (GLIBC_2.1.3) => /lib/libc.so.6
>                 libc.so.6 (GLIBC_2.2.4) => /lib/libc.so.6
>                 libc.so.6 (GLIBC_2.0) => /lib/libc.so.6
>         /lib/libc.so.6:
>                 ld-linux.so.2 (GLIBC_PRIVATE) => /lib/ld-linux.so.2
>                 ld-linux.so.2 (GLIBC_2.3) => /lib/ld-linux.so.2
>                 ld-linux.so.2 (GLIBC_2.1) => /lib/ld- linux.so.2
>
>
>
> ---- (2) ----
>
> #include <locale.h>
> #include <locale>
> #include <iostream>
> int main(int argv, char **argc)
> {
>
>         char *p;
>         lconv *lc;
>
>           // std::locale loc("en_US"); // fails
>
>         p = setlocale(LC_ALL, "en_US");
>         lc = localeconv();
>         std::cout << lc->decimal_point << std::endl;
>
>           return 0;
> }
>
>
> ---- (3) -----
> g++ -v
> Using built-in specs.
> Target: i486-linux-gnu
> Configured with: ../src/configure -v
> --enable-languages=c,c++,fortran,objc,obj-c++,treelang --prefix=/usr
> --enable-shared --with-system-zlib --libexecdir=/usr/lib
> --without-included-gettext --enable-threads=posix --enable-nls
> --with-gxx-include-dir=/usr/include/c++/4.1.3 --program-suffix=- 4.1
> --enable-__cxa_atexit --enable-clocale=gnu --enable-libstdcxx-debug
> --enable-mpfr --with-tune=i686 --enable-checking=release
> i486-linux-gnu
> Thread model: posix
> gcc version 4.1.3 20070601 (prerelease) (Debian 4.1.2-12 )