Add llvm::sys::{osName,osVersion} for retrieving operating system name

& version as strings.
 - Win32 code is untested.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56942 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/System/Host.h

@@ -14,6 +14,8 @@
 #ifndef LLVM_SYSTEM_HOST_H
 #define LLVM_SYSTEM_HOST_H
 
+#include <string>
+
 namespace llvm {
 namespace sys {
 
@@ -30,6 +32,13 @@ namespace sys {
     return !littleEndianHost();
   }
 
+  /// osName() - Return the name of the host operating system or "" if
+  /// unknown.
+  std::string osName();
+
+  /// osVersion() - Return the operating system version as a string or
+  /// "" if unknown.
+  std::string osVersion();
 }
 }
 

lib/System/Host.cpp

@@ -0,0 +1,24 @@
+//===-- Host.cpp - Implement OS Host Concept --------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  This header file implements the operating system Host concept.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/System/Host.h"
+#include "llvm/Config/config.h"
+
+// Include the platform-specific parts of this class.
+#ifdef LLVM_ON_UNIX
+#include "Unix/Host.inc"
+#endif
+#ifdef LLVM_ON_WIN32
+#include "Win32/Host.inc"
+#endif
+

lib/System/Unix/Host.inc

@@ -0,0 +1,42 @@
+ //===- llvm/System/Unix/Host.inc --------------------------------*- C++ -*-===//
+// 
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+// 
+//===----------------------------------------------------------------------===//
+//
+// This file implements the UNIX Host support.
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only generic UNIX code that
+//===          is guaranteed to work on *all* UNIX variants.
+//===----------------------------------------------------------------------===//
+
+#include <llvm/Config/config.h>
+#include "Unix.h"
+#include <sys/utsname.h>
+#include <string>
+
+using namespace llvm;
+
+std::string llvm::sys::osName() {
+  struct utsname info;
+
+  if (uname(&info))
+    return "";
+
+  return info.sysname;
+}
+
+std::string llvm::sys::osVersion() {
+  struct utsname info;
+
+  if (uname(&info))
+    return "";
+
+  return info.release;
+}

lib/System/Win32/Host.inc

@@ -0,0 +1,35 @@
+//===- llvm/System/Win32/Host.inc -------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the Win32 Host support.
+//
+//===----------------------------------------------------------------------===//
+
+#include "Win32.h"
+#include <cstdio>
+#include <string>
+
+using namespace llvm;
+
+std::string sys::osName() {
+  return "Windows";
+}
+
+std::string sys::osVersion() {
+  OSVERSIONINFO osvi = { 0 };
+  osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
+
+  if (!GetVersionEx(&osvi))
+    return "";
+  
+  char buf[64];
+  sprintf(buf, "%d.%d", osvi.dwMajorVersion, osvi.dwMinorVersion);
+
+  return buf;  
+}