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ostream.tcc (ostream::operator<<(_CharT)): Always allocate at least a byte.

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2002-03-27  Benjamin Kosnik  <bkoz@redhat.com>

	* include/bits/ostream.tcc (ostream::operator<<(_CharT)): Always
	allocate at least a byte.

	* testsuite/18_support/numeric_limits.cc (test_extrema): Make
	debugger-friendly.
	* testsuite/27_io/streambuf.cc (test07): Fix.
	(test06): Enable.

From-SVN: r51494
This commit is contained in:
Benjamin Kosnik 2002-03-28 03:15:08 +00:00 committed by Benjamin Kosnik
parent 47d0866c79
commit a3ebd14d24
4 changed files with 44 additions and 27 deletions
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10
libstdc++-v3/ChangeLog
View File

@ -1,3 +1,13 @@
2002-03-27 Benjamin Kosnik <bkoz@redhat.com>
* include/bits/ostream.tcc (ostream::operator<<(_CharT)): Always
allocate at least a byte.
* testsuite/18_support/numeric_limits.cc (test_extrema): Make
debugger-friendly.
* testsuite/27_io/streambuf.cc (test07): Fix.
(test06): Enable.
2002-03-27 Phil Edwards <pme@gcc.gnu.org>
* docs/doxygen/Intro.3: Date tweak.

2
libstdc++-v3/include/bits/ostream.tcc
View File

@ -481,7 +481,7 @@ namespace std
try
{
streamsize __w = __out.width();
_CharT* __pads = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT) * __w));
_CharT* __pads = static_cast<_CharT*>(__builtin_alloca((sizeof(_CharT) * __w) + 1));
__pads[0] = __c;
streamsize __len = 1;
if (__w > __len)

46
libstdc++-v3/testsuite/18_support/numeric_limits.cc
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@ -1,6 +1,6 @@
// 1999-08-23 bkoz
// Copyright (C) 1999, 2001 Free Software Foundation
// Copyright (C) 1999, 2001, 2002 Free Software Foundation
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
@ -56,33 +56,39 @@ template<typename T>
void test_extrema()
{
bool test = true;
VERIFY( extrema<T>::min == std::numeric_limits<T>::min() );
VERIFY( extrema<T>::max == std::numeric_limits<T>::max() );
T limits_min = std::numeric_limits<T>::min();
T limits_max = std::numeric_limits<T>::max();
T extrema_min = extrema<T>::min;
T extrema_max = extrema<T>::max;
VERIFY( extrema_min == limits_min );
VERIFY( extrema_max == limits_max );
}
#ifdef __FreeBSD__
// This specialization allows the extra precision unmentioned
// in system headers yet supported by long double on FreeBSD to
// not cause a gratuitous FAIL for the entire test. Using this
// technique to compare the residual against epsilon ensures that
// any major breakage will still be detected (although obviously not
// as tight as the exact equality check that would have been generated
// by default). This replacement test is allowable by the fact that
// C++ limits should match the system provided limits for C even if
// they were wrong verses the actual FP hardware.
// This specialization allows the extra precision unmentioned in
// system headers yet supported by long double on FreeBSD or Solaris
// to not cause a gratuitous FAIL for the entire test. Using this
// technique to compare the residual against epsilon ensures that any
// major breakage will still be detected (although obviously not as
// tight as the exact equality check that would have been generated by
// default). This replacement test is allowable by the fact that C++
// limits should match the system provided limits for C even if they
// were wrong verses the actual FP hardware.
template<>
void test_extrema<long double>()
{
typedef long double T;
bool test = true;
VERIFY( (extrema<T>::min - std::numeric_limits<T>::min())
< std::numeric_limits<T>::epsilon() );
VERIFY( (std::numeric_limits<T>::min() - extrema<T>::min)
< std::numeric_limits<T>::epsilon() );
VERIFY( (extrema<T>::max / std::numeric_limits<T>::max())
< (1 + std::numeric_limits<T>::epsilon()) );
VERIFY( (std::numeric_limits<T>::max() / extrema<T>::max)
< (1 + std::numeric_limits<T>::epsilon()) );
T limits_min = std::numeric_limits<T>::min();
T limits_max = std::numeric_limits<T>::max();
T extrema_min = extrema<T>::min;
T extrema_max = extrema<T>::max;
T epsilon = std::numeric_limits<T>::epsilon();
VERIFY( (extrema_min - limits_min) < epsilon );
VERIFY( (limits_min - extrema_min) < epsilon );
VERIFY( (extrema_max - limits_max) < (1 + epsilon) );
VERIFY( (limits_max - extrema_max) < (1 + epsilon) );
}
#endif

13
libstdc++-v3/testsuite/27_io/streambuf.cc
View File

@ -1,6 +1,6 @@
// 1999-10-11 bkoz
// Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
// Copyright (C) 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
@ -329,15 +329,12 @@ void test05()
}
// test06
// XXX this should work, doesn't due to compiler limitations.
#if 0
namespace gnu
{
class something_derived;
}
class gnu::something_derived : std::streambuf { };
#endif
// libstdc++/3599
class testbuf2 : public std::streambuf
@ -356,11 +353,15 @@ protected:
void
test07()
{
bool test = true;
testbuf2 ob;
std::ostream out(&ob);
VERIFY(out << "gasp");
VERIFY(out << std::endl);
out << "gasp";
VERIFY(out.good());
out << std::endl;
VERIFY(out.good());
}
int main()