Georg Baum wrote:
If you want to debug this fdurther it might be a good idea to write a small
standalone program that simply calls boost::format with the problematic
input.
boost::basic_format() itself seems working if it is called with
"ordinary" strings:
> #include <iostream>
> #include <boost/format.hpp>
>
> using namespace std;
>
> main()
> {
> cout << boost::basic_format<char >("test %1$s \n") % "OK";
> }
which prints out
test OK
And what is the value of *start? And how does the whole format string look
like?
They are as follows:
> (gdb) p *start
> $38 = (const wchar_t &) @0x8b1e9c0: 49
>
> (gdb) p start
> $39 = (
> __gnu_cxx::__normal_iterator<const
> wchar_t*,std::basic_string<wchar_t, std::char_traits<wchar_t>,
> std::allocator<wchar_t> > > &) @0xbfbfe2cc: {
> _M_current = 0x8b1e9c0}
>
> (gdb) x/25s 0xbfbfe2cc
> 0xbfbfe2cc: "\300\351\261\b\030\033\177)\r"
> 0xbfbfe2d6: ""
> 0xbfbfe2d7: ""
> 0xbfbfe2d8: "\214\351\261\bp\352\261\b"
> 0xbfbfe2e1: ""
> 0xbfbfe2e2: ""
> 0xbfbfe2e3: ""
> 0xbfbfe2e4: ""
> 0xbfbfe2e5: ""
> 0xbfbfe2e6: ""
> 0xbfbfe2e7: ""
> 0xbfbfe2e8: ""
> 0xbfbfe2e9: ""
> 0xbfbfe2ea: ""
> 0xbfbfe2eb: ""
> 0xbfbfe2ec:
"\234\v\177)\314;\177)8\344\277\277(\343\277\277f|v)\354;\177)\001"
> 0xbfbfe306: ""
> 0xbfbfe307: ""
> 0xbfbfe308:
"([EMAIL PROTECTED]
\037\177)%"
> 0xbfbfe32a: ""
> 0xbfbfe32b: ""
> 0xbfbfe32c: "\016\312\023\001\377\377\377\377"
> 0xbfbfe335: ""
> 0xbfbfe336: ""
> 0xbfbfe337: ""
I am now pretty sure that the
problem is not in any locale stuff, but in boost::format itself, because
normally this part of the code should only be reached with valid format
characters (and signed -65 == unsigned 191 == 0277 == 0xbf is not a valid
format character).
I'm not quite sure about the data structure used here, but arguments fmt
and arg1 in bformat() seem to contain no data fields:
src/support/lstrings.cpp line 875
>
template<>
docstring bformat<docstring>(docstring const & fmt, docstring arg1)
{
return (boost::basic_format<char_type>(fmt) % arg1).str();
}
Data:
fmt = $26 = (const docstring &) @0xbfbfe588: {static npos = 4294967295,
_M_dataplus = {<std::allocator<wchar_t>> = {<__gnu_cxx::new_allocator<wchar_t>> = {<No data fields>}, <No data fields>}, _M_p = 0x8b1e98c}}
arg1 = $27 = (docstring &) @0xbfbfe580: {static npos = 4294967295,
_M_dataplus = {<std::allocator<wchar_t>> = {<__gnu_cxx::new_allocator<wchar_t>> = {<No data fields>}, <No data fields>}, _M_p = 0x8b1e70c}}
And, subsequently call in boost/format/format_implementation.hpp line 60
template< class Ch, class Tr, class Alloc>
basic_format<Ch, Tr, Alloc>:: basic_format(const string_type& s)
: style_(0), cur_arg_(0), num_args_(0), dumped_(false),
exceptions_(io::all_error_bits)
{
parse(s);
}
Data:
s = $28 = (
const std::basic_string<wchar_t,std::char_traits<wchar_t>,std::allocator<wchar_t> > &) @0xbfbfe588: {static npos = 4294967295,
_M_dataplus = {<std::allocator<wchar_t>> = {<__gnu_cxx::new_allocator<wchar_t>> = {<No data fields>}, <No data fields>}, _M_p = 0x8b1e98c}}
I also attach the data of arguments passed to parse_printf_directive()
in boost/format/parsing.hpp which is called later:
boost/format/parsing.hpp line 437
>
bool parse_ok = io::detail::parse_printf_directive(
it, buf.end(), &items_[cur_item], fac, i1, exceptions());
(gdb) p it
$29 = {_M_current = 0x8b1e9c0}
(gdb) p buf.end()
$30 = {_M_current = 0x8b1ea70}
(gdb) p &items_[cur_item]
$31 = (
const class
boost::io::detail::format_item<wchar_t,std::char_traits<wchar_t>,std::allocator<wchar_t>
> *) 0x8af4a80
(gdb) p items_[cur_item]
$35 = (
const
boost::io::detail::format_item<wchar_t,std::char_traits<wchar_t>,std::allocator<wchar_t>
> &) @0x8af4a80: {argN_ = -1, res_ = {
static npos = 4294967295,
_M_dataplus = {<std::allocator<wchar_t>> = {<__gnu_cxx::new_allocator<wchar_t>> = {<No data fields>}, <No data fields>}, _M_p = 0x8a5a7a8}},
appendix_ = {static npos = 4294967295,
_M_dataplus = {<std::allocator<wchar_t>> = {<__gnu_cxx::new_allocator<wchar_t>> = {<No data fields>}, <No data fields>}, _M_p = 0x8a5a7a8}},
fmtstate_ = {width_ = 0, precision_ = 6, fill_ = 32, flags_ = 4098,
rdstate_ = std::_S_goodbit, exceptions_ = std::_S_goodbit,
loc_ = {<boost::optional_detail::optional_base<std::locale>> = {<boost::optional_detail::optional_tag> = {<No data fields>}, m_initialized = false,
m_storage = {dummy_ = {data = "\000\000\000",
aligner_ = <incomplete type>}}}, <No data fields>}},
truncate_ = 2147483647, pad_scheme_ = 0}
(gdb) p fac
$32 = (const struct std::ctype<wchar_t> &) @0x297f1f20: <incomplete type>
(gdb) p i1
$33 = 13
(gdb) p exceptions()
$34 = 255 '\377'
Are these passed data OK?
Thank you,
Koji
