Import C++ Standard Template Library

You can now use the hardest fastest and most dangerous language there is
with Cosmopolitan. So far about 75% of LLVM libcxx has been added. A few
breaking changes needed to be made to help this go smoothly.

- Rename nothrow to dontthrow
- Rename nodiscard to dontdiscard
- Add some libm functions, e.g. lgamma, nan, etc.
- Change intmax_t from int128 to int64 like everything else
- Introduce %jjd formatting directive for int128_t
- Introduce strtoi128(), strtou128(), etc.
- Rename bsrmax() to bsr128()

Some of the templates that should be working currently are std::vector,
std::string, std::map, std::set, std::deque, etc.

third_party/libcxx/__bsd_locale_fallbacks.h

@@ -0,0 +1,137 @@
+// -*- C++ -*-
+//===---------------------- __bsd_locale_fallbacks.h ----------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+// The BSDs have lots of *_l functions.  This file provides reimplementations
+// of those functions for non-BSD platforms.
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP_BSD_LOCALE_FALLBACKS_DEFAULTS_H
+#define _LIBCPP_BSD_LOCALE_FALLBACKS_DEFAULTS_H
+
+#include "third_party/libcxx/stdlib.h"
+#include "libc/mem/fmt.h"
+#include "third_party/libcxx/memory"
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+inline _LIBCPP_INLINE_VISIBILITY decltype(MB_CUR_MAX)
+    __libcpp_mb_cur_max_l(locale_t __l) {
+  __libcpp_locale_guard __current(__l);
+  return MB_CUR_MAX;
+}
+
+inline _LIBCPP_INLINE_VISIBILITY wint_t __libcpp_btowc_l(int __c,
+                                                         locale_t __l) {
+  __libcpp_locale_guard __current(__l);
+  return btowc(__c);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY int __libcpp_wctob_l(wint_t __c,
+                                                      locale_t __l) {
+  __libcpp_locale_guard __current(__l);
+  return wctob(__c);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY size_t
+__libcpp_wcsnrtombs_l(char* __dest, const wchar_t** __src, size_t __nwc,
+                      size_t __len, mbstate_t* __ps, locale_t __l) {
+  __libcpp_locale_guard __current(__l);
+  return wcsnrtombs(__dest, __src, __nwc, __len, __ps);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY size_t __libcpp_wcrtomb_l(char* __s,
+                                                           wchar_t __wc,
+                                                           mbstate_t* __ps,
+                                                           locale_t __l) {
+  __libcpp_locale_guard __current(__l);
+  return wcrtomb(__s, __wc, __ps);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY size_t
+__libcpp_mbsnrtowcs_l(wchar_t* __dest, const char** __src, size_t __nms,
+                      size_t __len, mbstate_t* __ps, locale_t __l) {
+  __libcpp_locale_guard __current(__l);
+  return mbsnrtowcs(__dest, __src, __nms, __len, __ps);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY size_t __libcpp_mbrtowc_l(wchar_t* __pwc,
+                                                           const char* __s,
+                                                           size_t __n,
+                                                           mbstate_t* __ps,
+                                                           locale_t __l) {
+  __libcpp_locale_guard __current(__l);
+  return mbrtowc(__pwc, __s, __n, __ps);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY int __libcpp_mbtowc_l(wchar_t* __pwc,
+                                                       const char* __pmb,
+                                                       size_t __max,
+                                                       locale_t __l) {
+  __libcpp_locale_guard __current(__l);
+  return mbtowc(__pwc, __pmb, __max);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY size_t __libcpp_mbrlen_l(const char* __s,
+                                                          size_t __n,
+                                                          mbstate_t* __ps,
+                                                          locale_t __l) {
+  __libcpp_locale_guard __current(__l);
+  return mbrlen(__s, __n, __ps);
+}
+
+inline _LIBCPP_INLINE_VISIBILITY lconv* __libcpp_localeconv_l(locale_t __l) {
+  __libcpp_locale_guard __current(__l);
+  return localeconv();
+}
+
+inline _LIBCPP_INLINE_VISIBILITY size_t __libcpp_mbsrtowcs_l(wchar_t* __dest,
+                                                             const char** __src,
+                                                             size_t __len,
+                                                             mbstate_t* __ps,
+                                                             locale_t __l) {
+  __libcpp_locale_guard __current(__l);
+  return mbsrtowcs(__dest, __src, __len, __ps);
+}
+
+inline int __libcpp_snprintf_l(char* __s, size_t __n, locale_t __l,
+                               const char* __format, ...) {
+  va_list __va;
+  va_start(__va, __format);
+  __libcpp_locale_guard __current(__l);
+  int __res = vsnprintf(__s, __n, __format, __va);
+  va_end(__va);
+  return __res;
+}
+
+inline int __libcpp_asprintf_l(char** __s, locale_t __l, const char* __format,
+                               ...) {
+  va_list __va;
+  va_start(__va, __format);
+  __libcpp_locale_guard __current(__l);
+  int __res = vasprintf(__s, __format, __va);
+  va_end(__va);
+  return __res;
+}
+
+inline int __libcpp_sscanf_l(const char* __s, locale_t __l,
+                             const char* __format, ...) {
+  va_list __va;
+  va_start(__va, __format);
+  __libcpp_locale_guard __current(__l);
+  int __res = vsscanf(__s, __format, __va);
+  va_end(__va);
+  return __res;
+}
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP_BSD_LOCALE_FALLBACKS_DEFAULTS_H