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clang-p2996/libcxx/test/std/input.output/string.streams/stringbuf/stringbuf.virtuals/seekoff.pass.cpp
Louis Dionne f4c1258d56 [libc++] Add an option to disable wide character support in libc++ 
Some embedded platforms do not wish to support the C library functionality
for handling wchar_t because they have no use for it. It makes sense for
libc++ to work properly on those platforms, so this commit adds a carve-out
of functionality for wchar_t.

Unfortunately, unlike some other carve-outs (e.g. random device), this
patch touches several parts of the library. However, despite the wide
impact of this patch, I still think it is important to support this
configuration since it makes it much simpler to port libc++ to some
embedded platforms.

Differential Revision: https://reviews.llvm.org/D111265
2021-10-12 06:08:23 -04:00

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9.2 KiB
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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
//
//===----------------------------------------------------------------------===//
// <sstream>
// template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
// class basic_stringbuf
// pos_type seekoff(off_type off, ios_base::seekdir way,
// ios_base::openmode which = ios_base::in | ios_base::out);
#include <sstream>
#include <cassert>
#include "test_macros.h"
int main(int, char**)
{
{
std::stringbuf sb(std::ios_base::in);
assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::out) == -1);
assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::out) == -1);
assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::out) == -1);
assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::in | std::ios_base::out) == -1);
assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::in | std::ios_base::out) == -1);
assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::in | std::ios_base::out) == -1);
assert(sb.pubseekoff(0, std::ios_base::beg, std::ios_base::in) == 0);
assert(sb.pubseekoff(0, std::ios_base::cur, std::ios_base::in) == 0);
assert(sb.pubseekoff(0, std::ios_base::end, std::ios_base::in) == 0);
}
{
std::stringbuf sb(std::ios_base::out);
assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::in) == -1);
assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::in) == -1);
assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::in) == -1);
assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::in | std::ios_base::out) == -1);
assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::in | std::ios_base::out) == -1);
assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::in | std::ios_base::out) == -1);
assert(sb.pubseekoff(0, std::ios_base::beg, std::ios_base::out) == 0);
assert(sb.pubseekoff(0, std::ios_base::cur, std::ios_base::out) == 0);
assert(sb.pubseekoff(0, std::ios_base::end, std::ios_base::out) == 0);
}
{
std::stringbuf sb("0123456789", std::ios_base::in);
assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::out) == -1);
assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::out) == -1);
assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::out) == -1);
assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::in | std::ios_base::out) == -1);
assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::in | std::ios_base::out) == -1);
assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::in | std::ios_base::out) == -1);
assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::in) == 3);
assert(sb.sgetc() == '3');
assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::in) == 6);
assert(sb.sgetc() == '6');
assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::in) == 7);
assert(sb.sgetc() == '7');
}
{
std::stringbuf sb("0123456789", std::ios_base::out);
assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::in) == -1);
assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::in) == -1);
assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::in) == -1);
assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::out | std::ios_base::in) == -1);
assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::out | std::ios_base::in) == -1);
assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::out | std::ios_base::in) == -1);
assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::out) == 3);
assert(sb.sputc('a') == 'a');
assert(sb.str() == "012a456789");
assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::out) == 7);
assert(sb.sputc('b') == 'b');
assert(sb.str() == "012a456b89");
assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::out) == 7);
assert(sb.sputc('c') == 'c');
assert(sb.str() == "012a456c89");
}
{
std::stringbuf sb("0123456789");
assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::in) == 3);
assert(sb.sgetc() == '3');
assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::in) == 6);
assert(sb.sgetc() == '6');
assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::in) == 7);
assert(sb.sgetc() == '7');
assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::out | std::ios_base::in) == 3);
assert(sb.sgetc() == '3');
assert(sb.sputc('a') == 'a');
assert(sb.str() == "012a456789");
assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::out | std::ios_base::in) == -1);
assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::out | std::ios_base::in) == 7);
assert(sb.sgetc() == '7');
assert(sb.sputc('c') == 'c');
assert(sb.str() == "012a456c89");
assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::out) == 3);
assert(sb.sputc('3') == '3');
assert(sb.str() == "0123456c89");
assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::out) == 7);
assert(sb.sputc('7') == '7');
assert(sb.str() == "0123456789");
assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::out) == 7);
assert(sb.sputc('c') == 'c');
assert(sb.str() == "0123456c89");
}
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
{
std::wstringbuf sb(L"0123456789", std::ios_base::in);
assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::out) == -1);
assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::out) == -1);
assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::out) == -1);
assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::in | std::ios_base::out) == -1);
assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::in | std::ios_base::out) == -1);
assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::in | std::ios_base::out) == -1);
assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::in) == 3);
assert(sb.sgetc() == L'3');
assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::in) == 6);
assert(sb.sgetc() == L'6');
assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::in) == 7);
assert(sb.sgetc() == L'7');
}
{
std::wstringbuf sb(L"0123456789", std::ios_base::out);
assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::in) == -1);
assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::in) == -1);
assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::in) == -1);
assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::out | std::ios_base::in) == -1);
assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::out | std::ios_base::in) == -1);
assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::out | std::ios_base::in) == -1);
assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::out) == 3);
assert(sb.sputc(L'a') == L'a');
assert(sb.str() == L"012a456789");
assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::out) == 7);
assert(sb.sputc(L'b') == L'b');
assert(sb.str() == L"012a456b89");
assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::out) == 7);
assert(sb.sputc(L'c') == L'c');
assert(sb.str() == L"012a456c89");
}
{
std::wstringbuf sb(L"0123456789");
assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::in) == 3);
assert(sb.sgetc() == L'3');
assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::in) == 6);
assert(sb.sgetc() == L'6');
assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::in) == 7);
assert(sb.sgetc() == L'7');
assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::out | std::ios_base::in) == 3);
assert(sb.sgetc() == L'3');
assert(sb.sputc(L'a') == L'a');
assert(sb.str() == L"012a456789");
assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::out | std::ios_base::in) == -1);
assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::out | std::ios_base::in) == 7);
assert(sb.sgetc() == L'7');
assert(sb.sputc(L'c') == L'c');
assert(sb.str() == L"012a456c89");
assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::out) == 3);
assert(sb.sputc(L'3') == L'3');
assert(sb.str() == L"0123456c89");
assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::out) == 7);
assert(sb.sputc(L'7') == L'7');
assert(sb.str() == L"0123456789");
assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::out) == 7);
assert(sb.sputc(L'c') == L'c');
assert(sb.str() == L"0123456c89");
}
#endif // TEST_HAS_NO_WIDE_CHARACTERS
return 0;
}
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