c0d0cbad9e
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@141003 91177308-0d34-0410-b5e6-96231b3b80d8
122 lines
3.7 KiB
C++
122 lines
3.7 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is dual licensed under the MIT and the University of Illinois Open
|
|
// Source Licenses. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// <fstream>
|
|
|
|
// int_type underflow();
|
|
|
|
// This test is not entirely portable
|
|
|
|
#include <fstream>
|
|
#include <cassert>
|
|
|
|
#include "../../../../platform_support.h" // locale name macros
|
|
|
|
template <class CharT>
|
|
struct test_buf
|
|
: public std::basic_filebuf<CharT>
|
|
{
|
|
typedef std::basic_filebuf<CharT> base;
|
|
typedef typename base::char_type char_type;
|
|
typedef typename base::int_type int_type;
|
|
|
|
char_type* eback() const {return base::eback();}
|
|
char_type* gptr() const {return base::gptr();}
|
|
char_type* egptr() const {return base::egptr();}
|
|
void gbump(int n) {base::gbump(n);}
|
|
|
|
virtual int_type underflow() {return base::underflow();}
|
|
};
|
|
|
|
int main()
|
|
{
|
|
{
|
|
test_buf<char> f;
|
|
assert(f.open("underflow.dat", std::ios_base::in) != 0);
|
|
assert(f.is_open());
|
|
assert(f.eback() == 0);
|
|
assert(f.gptr() == 0);
|
|
assert(f.egptr() == 0);
|
|
assert(f.underflow() == '1');
|
|
assert(f.eback() != 0);
|
|
assert(f.eback() == f.gptr());
|
|
assert(*f.gptr() == '1');
|
|
assert(f.egptr() - f.eback() == 9);
|
|
}
|
|
{
|
|
test_buf<char> f;
|
|
assert(f.open("underflow.dat", std::ios_base::in) != 0);
|
|
assert(f.pubsetbuf(0, 0));
|
|
assert(f.is_open());
|
|
assert(f.eback() == 0);
|
|
assert(f.gptr() == 0);
|
|
assert(f.egptr() == 0);
|
|
assert(f.underflow() == '1');
|
|
assert(f.eback() != 0);
|
|
assert(f.eback() == f.gptr());
|
|
assert(*f.gptr() == '1');
|
|
assert(f.egptr() - f.eback() == 8);
|
|
f.gbump(8);
|
|
assert(f.sgetc() == '9');
|
|
assert(f.eback()[0] == '5');
|
|
assert(f.eback()[1] == '6');
|
|
assert(f.eback()[2] == '7');
|
|
assert(f.eback()[3] == '8');
|
|
assert(f.gptr() - f.eback() == 4);
|
|
assert(*f.gptr() == '9');
|
|
assert(f.egptr() - f.gptr() == 1);
|
|
}
|
|
{
|
|
test_buf<wchar_t> f;
|
|
assert(f.open("underflow.dat", std::ios_base::in) != 0);
|
|
assert(f.is_open());
|
|
assert(f.eback() == 0);
|
|
assert(f.gptr() == 0);
|
|
assert(f.egptr() == 0);
|
|
assert(f.underflow() == L'1');
|
|
assert(f.eback() != 0);
|
|
assert(f.eback() == f.gptr());
|
|
assert(*f.gptr() == L'1');
|
|
assert(f.egptr() - f.eback() == 9);
|
|
}
|
|
{
|
|
test_buf<wchar_t> f;
|
|
assert(f.pubsetbuf(0, 0));
|
|
assert(f.open("underflow.dat", std::ios_base::in) != 0);
|
|
assert(f.is_open());
|
|
assert(f.eback() == 0);
|
|
assert(f.gptr() == 0);
|
|
assert(f.egptr() == 0);
|
|
assert(f.underflow() == L'1');
|
|
assert(f.eback() != 0);
|
|
assert(f.eback() == f.gptr());
|
|
assert(*f.gptr() == L'1');
|
|
assert(f.egptr() - f.eback() == 8);
|
|
f.gbump(8);
|
|
assert(f.sgetc() == L'9');
|
|
assert(f.eback()[0] == L'5');
|
|
assert(f.eback()[1] == L'6');
|
|
assert(f.eback()[2] == L'7');
|
|
assert(f.eback()[3] == L'8');
|
|
assert(f.gptr() - f.eback() == 4);
|
|
assert(*f.gptr() == L'9');
|
|
assert(f.egptr() - f.gptr() == 1);
|
|
}
|
|
{
|
|
test_buf<wchar_t> f;
|
|
f.pubimbue(std::locale(LOCALE_en_US_UTF_8));
|
|
assert(f.open("underflow_utf8.dat", std::ios_base::in) != 0);
|
|
assert(f.is_open());
|
|
assert(f.sbumpc() == 0x4E51);
|
|
assert(f.sbumpc() == 0x4E52);
|
|
assert(f.sbumpc() == 0x4E53);
|
|
assert(f.sbumpc() == -1);
|
|
}
|
|
}
|