From ccb23a13e90c20e555ede74f30ea2ecb90e24d18 Mon Sep 17 00:00:00 2001
From: Reid Spencer <rspencer@reidspencer.com>
Date: Mon, 13 Dec 2004 03:00:39 +0000
Subject: [PATCH] For PR351: \ * Move generic isArchive method here from
 Unix/Path.cpp \ * Implement isDynamicLibrary \ * Implement FindLibrary for
 Linker

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18861 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/System/Path.cpp | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/lib/System/Path.cpp b/lib/System/Path.cpp
index 1504f0d8312..1a6d030f896 100644
--- a/lib/System/Path.cpp
+++ b/lib/System/Path.cpp
@@ -49,6 +49,37 @@ sys::IdentifyFileType(const char*magic, unsigned length) {
   return UnknownFileType;
 }
 
+bool
+Path::isArchive() const {
+  if (readable())
+    return hasMagicNumber("!<arch>\012");
+  return false;
+}
+
+bool
+Path::isDynamicLibrary() const {
+  if (readable()) 
+    return hasMagicNumber("\177ELF");
+  return false;
+}
+
+Path
+Path::FindLibrary(std::string& name) {
+  std::vector<sys::Path> LibPaths;
+  GetSystemLibraryPaths(LibPaths);
+  for (unsigned i = 0; i < LibPaths.size(); ++i) {
+    sys::Path FullPath(LibPaths[i]);
+    FullPath.appendFile("lib" + name + LTDL_SHLIB_EXT);
+    if (FullPath.isDynamicLibrary())
+      return FullPath;
+    FullPath.elideSuffix();
+    FullPath.appendSuffix("a");
+    if (FullPath.isArchive())
+      return FullPath;
+  }
+  return sys::Path();
+}
+
 }
 
 // Include the truly platform-specific parts of this class.