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* libstdc++/6701: do_narrow on range is fubar
@ 2002-05-17 10:16 dale
0 siblings, 0 replies; 2+ messages in thread
From: dale @ 2002-05-17 10:16 UTC (permalink / raw)
To: gcc-gnats
>Number: 6701
>Category: libstdc++
>Synopsis: do_narrow on range is fubar
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Fri May 17 10:16:00 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: Dale Peakall
>Release: gcc 3.1 20020510 (prerelease)
>Organization:
>Environment:
solaris 8
>Description:
The implementation of do_narrow in ctype.cc for a range:
1) always changes the first character to the default char
2) doesn't narrow the whole string if a non-ascii char is
found
22.2.1.1.2 para 13 of the C++ standard states:
The second form [range form] transforms each character *p
in the range [low, high), placing the result (or dfault if
no simple transformation is readily available) in dest[p-low].
>How-To-Repeat:
std::wstring wide(L"wibble");
std::vector<char> narrow_chars(wide.length() + 1);
std::locale loc;
std::use_facet<std::ctype<wchar_t> >(loc).narrow(
&wide[0], &wide[wide.length()], '?', &narrow_chars[0]);
>Fix:
const wchar_t*
ctype<wchar_t>::
do_narrow(const wchar_t* __lo, const wchar_t* __hi, char __dfault,
char* __dest) const
{
size_t __offset = 0;
for(;;)
{
const wchar_t* __start = __lo + __offset;
size_t __len = __hi - __start;
mbstate_t __state;
memset(static_cast<void*>(&__state), 0, sizeof(mbstate_t));
size_t __conv = wcsrtombs(__dest + __offset, &__start, __len, &__state);
if(__conv != __len && __start != 0)
{
__offset = __start - __lo;
__dest[__offset++] = __dfault;
}
else
break;
}
return __hi;
}
>Release-Note:
>Audit-Trail:
>Unformatted:
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: libstdc++/6701: do_narrow on range is fubar
@ 2002-05-27 2:33 bkoz
0 siblings, 0 replies; 2+ messages in thread
From: bkoz @ 2002-05-27 2:33 UTC (permalink / raw)
To: bkoz, dale, gcc-bugs, gcc-prs, nobody
Synopsis: do_narrow on range is fubar
Responsible-Changed-From-To: unassigned->bkoz
Responsible-Changed-By: bkoz
Responsible-Changed-When: Mon May 27 02:33:05 2002
Responsible-Changed-Why:
Mine.
State-Changed-From-To: open->closed
State-Changed-By: bkoz
State-Changed-When: Mon May 27 02:33:05 2002
State-Changed-Why:
Fixed.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=6701
^ permalink raw reply [flat|nested] 2+ messages in thread
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2002-05-17 10:16 libstdc++/6701: do_narrow on range is fubar dale
2002-05-27 2:33 bkoz
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