ba87515fea
Currently, the library-internal feature test macros are only defined if the feature is not available, and always have the prefix `_LIBCPP_HAS_NO_`. This patch changes that, so that they are always defined and have the prefix `_LIBCPP_HAS_` instead. This changes the canonical use of these macros to `#if _LIBCPP_HAS_FEATURE`, which means that using an undefined macro (e.g. due to a missing include) is diagnosed now. While this is rather unlikely currently, a similar change in `<__configuration/availability.h>` caught a few bugs. This also improves readability, since it removes the double-negation of `#ifndef _LIBCPP_HAS_NO_FEATURE`. The current patch only touches the macros defined in `<__config>`. If people are happy with this approach, I'll make a follow-up PR to also change the macros defined in `<__config_site>`.
78 lines
2.1 KiB
C++
78 lines
2.1 KiB
C++
//===----------------------------------------------------------------------===////
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===////
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#ifndef FILESYSTEM_FORMAT_STRING_H
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#define FILESYSTEM_FORMAT_STRING_H
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#include <__assert>
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#include <__config>
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#include <array>
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#include <cstdarg>
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#include <cstddef>
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#include <cstdio>
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#include <string>
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#if defined(_LIBCPP_WIN32API)
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# define PATHSTR(x) (L##x)
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# define PATH_CSTR_FMT "\"%ls\""
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#else
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# define PATHSTR(x) (x)
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# define PATH_CSTR_FMT "\"%s\""
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#endif
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_LIBCPP_BEGIN_NAMESPACE_FILESYSTEM
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namespace detail {
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inline _LIBCPP_ATTRIBUTE_FORMAT(__printf__, 1, 0) string vformat_string(const char* msg, va_list ap) {
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array<char, 256> buf;
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va_list apcopy;
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va_copy(apcopy, ap);
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int ret = ::vsnprintf(buf.data(), buf.size(), msg, apcopy);
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va_end(apcopy);
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string result;
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if (static_cast<size_t>(ret) < buf.size()) {
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result.assign(buf.data(), static_cast<size_t>(ret));
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} else {
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// we did not provide a long enough buffer on our first attempt. The
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// return value is the number of bytes (excluding the null byte) that are
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// needed for formatting.
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size_t size_with_null = static_cast<size_t>(ret) + 1;
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result.__resize_default_init(size_with_null - 1);
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ret = ::vsnprintf(&result[0], size_with_null, msg, ap);
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_LIBCPP_ASSERT_INTERNAL(static_cast<size_t>(ret) == (size_with_null - 1), "TODO");
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}
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return result;
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}
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inline _LIBCPP_ATTRIBUTE_FORMAT(__printf__, 1, 2) string format_string(const char* msg, ...) {
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string ret;
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va_list ap;
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va_start(ap, msg);
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#if _LIBCPP_HAS_EXCEPTIONS
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try {
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#endif // _LIBCPP_HAS_EXCEPTIONS
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ret = detail::vformat_string(msg, ap);
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#if _LIBCPP_HAS_EXCEPTIONS
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} catch (...) {
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va_end(ap);
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throw;
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}
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#endif // _LIBCPP_HAS_EXCEPTIONS
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va_end(ap);
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return ret;
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}
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} // namespace detail
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_LIBCPP_END_NAMESPACE_FILESYSTEM
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#endif // FILESYSTEM_FORMAT_STRING_H
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