Release Cosmopolitan v3.6.0

This release is an atomic upgrade to GCC 14.1.0 with C23 and C++23

third_party/libcxx/system_error.cpp

@@ -0,0 +1,223 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include <__assert>
+#include <__config>
+#include <__verbose_abort>
+#include <cerrno>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <string.h>
+#include <string>
+#include <system_error>
+
+#include "config_elast.h"
+
+#if defined(__ANDROID__)
+#  include <android/api-level.h>
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+namespace {
+#if !defined(_LIBCPP_HAS_NO_THREADS)
+
+//  GLIBC also uses 1024 as the maximum buffer size internally.
+constexpr size_t strerror_buff_size = 1024;
+
+string do_strerror_r(int ev);
+
+#  if defined(_LIBCPP_MSVCRT_LIKE)
+string do_strerror_r(int ev) {
+  char buffer[strerror_buff_size];
+  if (::strerror_s(buffer, strerror_buff_size, ev) == 0)
+    return string(buffer);
+  std::snprintf(buffer, strerror_buff_size, "unknown error %d", ev);
+  return string(buffer);
+}
+#  else
+
+// Only one of the two following functions will be used, depending on
+// the return type of strerror_r:
+
+// For the GNU variant, a char* return value:
+__attribute__((unused)) const char* handle_strerror_r_return(char* strerror_return, char* buffer) {
+  // GNU always returns a string pointer in its return value. The
+  // string might point to either the input buffer, or a static
+  // buffer, but we don't care which.
+  return strerror_return;
+}
+
+// For the POSIX variant: an int return value.
+__attribute__((unused)) const char* handle_strerror_r_return(int strerror_return, char* buffer) {
+  // The POSIX variant either:
+  // - fills in the provided buffer and returns 0
+  // - returns a positive error value, or
+  // - returns -1 and fills in errno with an error value.
+  if (strerror_return == 0)
+    return buffer;
+
+  // Only handle EINVAL. Other errors abort.
+  int new_errno = strerror_return == -1 ? errno : strerror_return;
+  if (new_errno == EINVAL)
+    return "";
+
+  _LIBCPP_ASSERT_INTERNAL(new_errno == ERANGE, "unexpected error from ::strerror_r");
+  // FIXME maybe? 'strerror_buff_size' is likely to exceed the
+  // maximum error size so ERANGE shouldn't be returned.
+  std::abort();
+}
+
+// This function handles both GNU and POSIX variants, dispatching to
+// one of the two above functions.
+string do_strerror_r(int ev) {
+  char buffer[strerror_buff_size];
+  // Preserve errno around the call. (The C++ standard requires that
+  // system_error functions not modify errno).
+  const int old_errno       = errno;
+  const char* error_message = handle_strerror_r_return(::strerror_r(ev, buffer, strerror_buff_size), buffer);
+  // If we didn't get any message, print one now.
+  if (!error_message[0]) {
+    std::snprintf(buffer, strerror_buff_size, "Unknown error %d", ev);
+    error_message = buffer;
+  }
+  errno = old_errno;
+  return string(error_message);
+}
+#  endif
+
+#endif // !defined(_LIBCPP_HAS_NO_THREADS)
+
+string make_error_str(const error_code& ec, string what_arg) {
+  if (ec) {
+    if (!what_arg.empty()) {
+      what_arg += ": ";
+    }
+    what_arg += ec.message();
+  }
+  return what_arg;
+}
+
+string make_error_str(const error_code& ec) {
+  if (ec) {
+    return ec.message();
+  }
+  return string();
+}
+} // end namespace
+
+string __do_message::message(int ev) const {
+#if defined(_LIBCPP_HAS_NO_THREADS)
+  return string(::strerror(ev));
+#else
+  return do_strerror_r(ev);
+#endif
+}
+
+class _LIBCPP_HIDDEN __generic_error_category : public __do_message {
+public:
+  virtual const char* name() const noexcept;
+  virtual string message(int ev) const;
+};
+
+const char* __generic_error_category::name() const noexcept { return "generic"; }
+
+string __generic_error_category::message(int ev) const {
+#ifdef _LIBCPP_ELAST
+  if (ev > _LIBCPP_ELAST)
+    return string("unspecified generic_category error");
+#endif // _LIBCPP_ELAST
+  return __do_message::message(ev);
+}
+
+const error_category& generic_category() noexcept {
+  union AvoidDestroyingGenericCategory {
+    __generic_error_category generic_error_category;
+    constexpr explicit AvoidDestroyingGenericCategory() : generic_error_category() {}
+    ~AvoidDestroyingGenericCategory() {}
+  };
+  constinit static AvoidDestroyingGenericCategory helper;
+  return helper.generic_error_category;
+}
+
+class _LIBCPP_HIDDEN __system_error_category : public __do_message {
+public:
+  virtual const char* name() const noexcept;
+  virtual string message(int ev) const;
+  virtual error_condition default_error_condition(int ev) const noexcept;
+};
+
+const char* __system_error_category::name() const noexcept { return "system"; }
+
+string __system_error_category::message(int ev) const {
+#ifdef _LIBCPP_ELAST
+  if (ev > _LIBCPP_ELAST)
+    return string("unspecified system_category error");
+#endif // _LIBCPP_ELAST
+  return __do_message::message(ev);
+}
+
+error_condition __system_error_category::default_error_condition(int ev) const noexcept {
+#ifdef _LIBCPP_ELAST
+  if (ev > _LIBCPP_ELAST)
+    return error_condition(ev, system_category());
+#endif // _LIBCPP_ELAST
+  return error_condition(ev, generic_category());
+}
+
+const error_category& system_category() noexcept {
+  union AvoidDestroyingSystemCategory {
+    __system_error_category system_error_category;
+    constexpr explicit AvoidDestroyingSystemCategory() : system_error_category() {}
+    ~AvoidDestroyingSystemCategory() {}
+  };
+  constinit static AvoidDestroyingSystemCategory helper;
+  return helper.system_error_category;
+}
+
+// error_condition
+
+string error_condition::message() const { return __cat_->message(__val_); }
+
+// error_code
+
+string error_code::message() const { return __cat_->message(__val_); }
+
+// system_error
+
+system_error::system_error(error_code ec, const string& what_arg)
+    : runtime_error(make_error_str(ec, what_arg)), __ec_(ec) {}
+
+system_error::system_error(error_code ec, const char* what_arg)
+    : runtime_error(make_error_str(ec, what_arg)), __ec_(ec) {}
+
+system_error::system_error(error_code ec) : runtime_error(make_error_str(ec)), __ec_(ec) {}
+
+system_error::system_error(int ev, const error_category& ecat, const string& what_arg)
+    : runtime_error(make_error_str(error_code(ev, ecat), what_arg)), __ec_(error_code(ev, ecat)) {}
+
+system_error::system_error(int ev, const error_category& ecat, const char* what_arg)
+    : runtime_error(make_error_str(error_code(ev, ecat), what_arg)), __ec_(error_code(ev, ecat)) {}
+
+system_error::system_error(int ev, const error_category& ecat)
+    : runtime_error(make_error_str(error_code(ev, ecat))), __ec_(error_code(ev, ecat)) {}
+
+system_error::~system_error() noexcept {}
+
+void __throw_system_error(int ev, const char* what_arg) {
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
+  std::__throw_system_error(error_code(ev, system_category()), what_arg);
+#else
+  // The above could also handle the no-exception case, but for size, avoid referencing system_category() unnecessarily.
+  _LIBCPP_VERBOSE_ABORT(
+      "system_error was thrown in -fno-exceptions mode with error %i and message \"%s\"", ev, what_arg);
+#endif
+}
+
+_LIBCPP_END_NAMESPACE_STD