From e0b126d8c7f691856ec4d80bb57cb1ba5c71fd69 Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Wed, 22 Jun 2016 23:00:36 +0300
Subject: Add mkslink(), mkhlink()

---
 butl/filesystem.cxx | 61 +++++++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 54 insertions(+), 7 deletions(-)

(limited to 'butl/filesystem.cxx')

diff --git a/butl/filesystem.cxx b/butl/filesystem.cxx
index a2d6434..c3d21cd 100644
--- a/butl/filesystem.cxx
+++ b/butl/filesystem.cxx
@@ -4,18 +4,23 @@
 
 #include <butl/filesystem>
 
-#include <errno.h>     // errno, E*
-#include <unistd.h>    // stat, rmdir(), unlink()
-#include <sys/types.h> // stat
-#include <sys/stat.h>  // stat(), lstat(), S_IS*, mkdir()
-
 #ifndef _WIN32
 #  include <dirent.h> // struct dirent, *dir()
+#  include <unistd.h> // symlink(), link()
 #else
-#  include <io.h>     // _find*()
-#  include <direct.h> // _mkdir()
+#  include <butl/win32-utility>
+
+#  include <io.h>       // _find*()
+#  include <direct.h>   // _mkdir()
+
+#  include <cassert>
 #endif
 
+#include <errno.h>     // errno, E*
+#include <unistd.h>    // stat, rmdir(), unlink()
+#include <sys/types.h> // stat
+#include <sys/stat.h>  // stat(), lstat(), S_IS*, mkdir()
+
 #include <memory>       // unique_ptr
 #include <system_error>
 
@@ -152,6 +157,48 @@ namespace butl
     return r;
   }
 
+#ifndef _WIN32
+  void
+  mksymlink (const path& target, const path& link, bool)
+  {
+    if (symlink (target.string ().c_str (), link.string ().c_str ()) == -1)
+      throw system_error (errno, system_category ());
+  }
+
+  void
+  mkhardlink (const path& target, const path& link, bool)
+  {
+    if (::link (target.string ().c_str (), link.string ().c_str ()) == -1)
+      throw system_error (errno, system_category ());
+  }
+
+#else
+
+  void
+  mksymlink (const path&, const path&, bool)
+  {
+    throw system_error (ENOSYS, system_category (), "symlinks not supported");
+  }
+
+  void
+  mkhardlink (const path& target, const path& link, bool dir)
+  {
+    if (!dir)
+    {
+      if (!CreateHardLinkA (link.string ().c_str (),
+                            target.string ().c_str (),
+                            nullptr))
+      {
+        string e (win32::last_error_msg ());
+        throw system_error (EIO, system_category (), e);
+      }
+    }
+    else
+      throw system_error (
+        ENOSYS, system_category (), "directory hard links not supported");
+  }
+#endif
+
   // Figuring out whether we have the nanoseconds in struct stat. Some
   // platforms (e.g., FreeBSD), may provide some "compatibility" #define's,
   // so use the second argument to not end up with the same signatures.
-- 
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