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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// <fstream>
// pos_type seekoff(off_type off, ios_base::seekdir way,
// ios_base::openmode which = ios_base::in | ios_base::out);
// pos_type seekpos(pos_type sp,
// ios_base::openmode which = ios_base::in | ios_base::out);
// FILE_DEPENDENCIES: underflow.dat
#include <fstream>
#include <cassert>
#include "test_macros.h"
int main(int, char**)
{
{
char buf[10];
typedef std::filebuf::pos_type pos_type;
std::filebuf f;
f.pubsetbuf(buf, sizeof(buf));
assert(f.open("seekoff.dat", std::ios_base::in | std::ios_base::out
| std::ios_base::trunc) != 0);
assert(f.is_open());
f.sputn("abcdefghijklmnopqrstuvwxyz", 26);
LIBCPP_ASSERT(buf[0] == 'v');
pos_type p = f.pubseekoff(-15, std::ios_base::cur);
assert(p == 11);
assert(f.sgetc() == 'l');
f.pubseekoff(0, std::ios_base::beg);
assert(f.sgetc() == 'a');
f.pubseekoff(-1, std::ios_base::end);
assert(f.sgetc() == 'z');
assert(f.pubseekpos(p) == p);
assert(f.sgetc() == 'l');
}
std::remove("seekoff.dat");
{
wchar_t buf[10];
typedef std::filebuf::pos_type pos_type;
std::wfilebuf f;
f.pubsetbuf(buf, sizeof(buf)/sizeof(buf[0]));
assert(f.open("seekoff.dat", std::ios_base::in | std::ios_base::out
| std::ios_base::trunc) != 0);
assert(f.is_open());
f.sputn(L"abcdefghijklmnopqrstuvwxyz", 26);
LIBCPP_ASSERT(buf[0] == L'v');
pos_type p = f.pubseekoff(-15, std::ios_base::cur);
assert(p == 11);
assert(f.sgetc() == L'l');
f.pubseekoff(0, std::ios_base::beg);
assert(f.sgetc() == L'a');
f.pubseekoff(-1, std::ios_base::end);
assert(f.sgetc() == L'z');
assert(f.pubseekpos(p) == p);
assert(f.sgetc() == L'l');
}
std::remove("seekoff.dat");
return 0;
}
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