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clang-p2996/libcxx/test/std/localization/locale.stdcvt/codecvt_utf8_utf16_length.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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//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
// <codecvt>
// template <class Elem, unsigned long Maxcode = 0x10ffff,
// codecvt_mode Mode = (codecvt_mode)0>
// class codecvt_utf8_utf16
// : public codecvt<Elem, char, mbstate_t>
// {
// // unspecified
// };
// int length(stateT& state, const externT* from, const externT* from_end,
// size_t max) const;
#include <codecvt>
#include <cassert>
#include "test_macros.h"
int main(int, char**)
{
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
{
typedef std::codecvt_utf8_utf16<wchar_t> C;
C c;
char n[4] = {char(0xF1), char(0x80), char(0x80), char(0x83)};
std::mbstate_t m;
int r = c.length(m, n, n+4, 2);
assert(r == 4);
n[0] = char(0xE1);
n[1] = char(0x80);
n[2] = char(0x85);
r = c.length(m, n, n+3, 2);
assert(r == 3);
n[0] = char(0xD1);
n[1] = char(0x93);
r = c.length(m, n, n+2, 2);
assert(r == 2);
n[0] = char(0x56);
r = c.length(m, n, n+1, 2);
assert(r == 1);
}
{
typedef std::codecvt_utf8_utf16<wchar_t, 0x1000> C;
C c;
char n[4] = {char(0xF1), char(0x80), char(0x80), char(0x83)};
std::mbstate_t m;
int r = c.length(m, n, n+4, 2);
assert(r == 0);
n[0] = char(0xE1);
n[1] = char(0x80);
n[2] = char(0x85);
r = c.length(m, n, n+3, 2);
assert(r == 0);
n[0] = char(0xD1);
n[1] = char(0x93);
r = c.length(m, n, n+2, 2);
assert(r == 2);
n[0] = char(0x56);
r = c.length(m, n, n+1, 2);
assert(r == 1);
}
{
typedef std::codecvt_utf8_utf16<wchar_t, 0x10ffff, std::consume_header> C;
C c;
char n[7] = {char(0xEF), char(0xBB), char(0xBF), char(0xF1), char(0x80), char(0x80), char(0x83)};
std::mbstate_t m;
int r = c.length(m, n, n+7, 2);
assert(r == 7);
n[0] = char(0xE1);
n[1] = char(0x80);
n[2] = char(0x85);
r = c.length(m, n, n+3, 2);
assert(r == 3);
n[0] = char(0xD1);
n[1] = char(0x93);
r = c.length(m, n, n+2, 2);
assert(r == 2);
n[0] = char(0x56);
r = c.length(m, n, n+1, 2);
assert(r == 1);
}
#endif // TEST_HAS_NO_WIDE_CHARACTERS
{
typedef std::codecvt_utf8_utf16<char32_t> C;
C c;
char n[4] = {char(0xF1), char(0x80), char(0x80), char(0x83)};
std::mbstate_t m;
int r = c.length(m, n, n+4, 2);
assert(r == 4);
n[0] = char(0xE1);
n[1] = char(0x80);
n[2] = char(0x85);
r = c.length(m, n, n+3, 2);
assert(r == 3);
n[0] = char(0xD1);
n[1] = char(0x93);
r = c.length(m, n, n+2, 2);
assert(r == 2);
n[0] = char(0x56);
r = c.length(m, n, n+1, 2);
assert(r == 1);
}
{
typedef std::codecvt_utf8_utf16<char32_t, 0x1000> C;
C c;
char n[4] = {char(0xF1), char(0x80), char(0x80), char(0x83)};
std::mbstate_t m;
int r = c.length(m, n, n+4, 2);
assert(r == 0);
n[0] = char(0xE1);
n[1] = char(0x80);
n[2] = char(0x85);
r = c.length(m, n, n+3, 2);
assert(r == 0);
n[0] = char(0xD1);
n[1] = char(0x93);
r = c.length(m, n, n+2, 2);
assert(r == 2);
n[0] = char(0x56);
r = c.length(m, n, n+1, 2);
assert(r == 1);
}
{
typedef std::codecvt_utf8_utf16<char32_t, 0x10ffff, std::consume_header> C;
C c;
char n[7] = {char(0xEF), char(0xBB), char(0xBF), char(0xF1), char(0x80), char(0x80), char(0x83)};
std::mbstate_t m;
int r = c.length(m, n, n+7, 2);
assert(r == 7);
n[0] = char(0xE1);
n[1] = char(0x80);
n[2] = char(0x85);
r = c.length(m, n, n+3, 2);
assert(r == 3);
n[0] = char(0xD1);
n[1] = char(0x93);
r = c.length(m, n, n+2, 2);
assert(r == 2);
n[0] = char(0x56);
r = c.length(m, n, n+1, 2);
assert(r == 1);
}
{
typedef std::codecvt_utf8_utf16<char16_t> C;
C c;
char n[4] = {char(0xF1), char(0x80), char(0x80), char(0x83)};
std::mbstate_t m;
int r = c.length(m, n, n+4, 2);
assert(r == 4);
n[0] = char(0xE1);
n[1] = char(0x80);
n[2] = char(0x85);
r = c.length(m, n, n+3, 2);
assert(r == 3);
n[0] = char(0xD1);
n[1] = char(0x93);
r = c.length(m, n, n+2, 2);
assert(r == 2);
n[0] = char(0x56);
r = c.length(m, n, n+1, 2);
assert(r == 1);
}
{
typedef std::codecvt_utf8_utf16<char16_t, 0x1000> C;
C c;
char n[4] = {char(0xF1), char(0x80), char(0x80), char(0x83)};
std::mbstate_t m;
int r = c.length(m, n, n+4, 2);
assert(r == 0);
n[0] = char(0xE1);
n[1] = char(0x80);
n[2] = char(0x85);
r = c.length(m, n, n+3, 2);
assert(r == 0);
n[0] = char(0xD1);
n[1] = char(0x93);
r = c.length(m, n, n+2, 2);
assert(r == 2);
n[0] = char(0x56);
r = c.length(m, n, n+1, 2);
assert(r == 1);
}
{
typedef std::codecvt_utf8_utf16<char16_t, 0x10ffff, std::consume_header> C;
C c;
char n[7] = {char(0xEF), char(0xBB), char(0xBF), char(0xF1), char(0x80), char(0x80), char(0x83)};
std::mbstate_t m;
int r = c.length(m, n, n+7, 2);
assert(r == 7);
n[0] = char(0xE1);
n[1] = char(0x80);
n[2] = char(0x85);
r = c.length(m, n, n+3, 2);
assert(r == 3);
n[0] = char(0xD1);
n[1] = char(0x93);
r = c.length(m, n, n+2, 2);
assert(r == 2);
n[0] = char(0x56);
r = c.length(m, n, n+1, 2);
assert(r == 1);
}
return 0;
}
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