Merge System into Support.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120298 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Support/system_error.cpp

@@ -0,0 +1,121 @@
+//===---------------------- system_error.cpp ------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This was lifted from libc++ and modified for C++03.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/system_error.h"
+#include "llvm/Support/Errno.h"
+#include <string>
+#include <cstring>
+
+namespace llvm {
+
+// class error_category
+
+error_category::error_category() {
+}
+
+error_category::~error_category() {
+}
+
+error_condition
+error_category::default_error_condition(int ev) const {
+  return error_condition(ev, *this);
+}
+
+bool
+error_category::equivalent(int code, const error_condition& condition) const {
+  return default_error_condition(code) == condition;
+}
+
+bool
+error_category::equivalent(const error_code& code, int condition) const {
+  return *this == code.category() && code.value() == condition;
+}
+
+std::string
+_do_message::message(int ev) const {
+  return std::string(sys::StrError(ev));
+}
+
+class _generic_error_category : public _do_message {
+public:
+  virtual const char* name() const;
+  virtual std::string message(int ev) const;
+};
+
+const char*
+_generic_error_category::name() const {
+  return "generic";
+}
+
+std::string
+_generic_error_category::message(int ev) const {
+#ifdef ELAST
+  if (ev > ELAST)
+    return std::string("unspecified generic_category error");
+#endif  // ELAST
+  return _do_message::message(ev);
+}
+
+const error_category&
+generic_category() {
+  static _generic_error_category s;
+  return s;
+}
+
+class _system_error_category : public _do_message {
+public:
+  virtual const char* name() const;
+  virtual std::string message(int ev) const;
+  virtual error_condition default_error_condition(int ev) const;
+};
+
+const char*
+_system_error_category::name() const {
+  return "system";
+}
+
+// std::string _system_error_category::message(int ev) const {
+// Is in Platform/system_error.inc
+
+// error_condition _system_error_category::default_error_condition(int ev) const
+// Is in Platform/system_error.inc
+
+const error_category&
+system_category() {
+  static _system_error_category s;
+  return s;
+}
+
+// error_condition
+
+std::string
+error_condition::message() const {
+  return _cat_->message(_val_);
+}
+
+// error_code
+
+std::string
+error_code::message() const {
+  return _cat_->message(_val_);
+}
+
+} // end namespace llvm
+
+// Include the truly platform-specific parts of this class.
+#if defined(LLVM_ON_UNIX)
+#include "Unix/system_error.inc"
+#endif
+#if defined(LLVM_ON_WIN32)
+#include "Windows/system_error.inc"
+#endif