Move path and filesystem from build2 to libbutl

1 files changed, 101 insertions, 0 deletions

diff --git a/butl/filesystem.cxx b/butl/filesystem.cxx
new file mode 100644
index 0000000..230bc8e
--- /dev/null
+++ b/butl/filesystem.cxx
@@ -0,0 +1,101 @@
+// file      : butl/filesystem.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#include <butl/filesystem>
+
+#include <unistd.h>    // rmdir(), unlink()
+#include <sys/types.h> // stat
+#include <sys/stat.h>  // stat, lstat(), S_IS*, mkdir()
+
+#include <system_error>
+
+using namespace std;
+
+namespace butl
+{
+  bool
+  dir_exists (const path& p)
+  {
+    struct stat s;
+    if (::lstat (p.string ().c_str (), &s) != 0)
+    {
+      if (errno == ENOENT || errno == ENOTDIR)
+        return false;
+      else
+        throw system_error (errno, system_category ());
+    }
+
+    return S_ISDIR (s.st_mode);
+  }
+
+  bool
+  file_exists (const path& p)
+  {
+    struct stat s;
+    if (::lstat (p.string ().c_str (), &s) != 0)
+    {
+      if (errno == ENOENT || errno == ENOTDIR)
+        return false;
+      else
+        throw system_error (errno, system_category ());
+    }
+
+    return S_ISREG (s.st_mode);
+  }
+
+  mkdir_status
+  try_mkdir (const path& p, mode_t m)
+  {
+    mkdir_status r (mkdir_status::success);
+
+    if (::mkdir (p.string ().c_str (), m) != 0)
+    {
+      int e (errno);
+
+      // EEXIST means the path already exists but not necessarily as
+      // a directory.
+      //
+      if (e == EEXIST && dir_exists (p))
+        return mkdir_status::already_exists;
+      else
+        throw system_error (e, system_category ());
+    }
+
+    return r;
+  }
+
+  rmdir_status
+  try_rmdir (const path& p)
+  {
+    rmdir_status r (rmdir_status::success);
+
+    if (::rmdir (p.string ().c_str ()) != 0)
+    {
+      if (errno == ENOENT)
+        r = rmdir_status::not_exist;
+      else if (errno == ENOTEMPTY || errno == EEXIST)
+        r = rmdir_status::not_empty;
+      else
+        throw system_error (errno, system_category ());
+    }
+
+    return r;
+  }
+
+  rmfile_status
+  try_rmfile (const path& p)
+  {
+    rmfile_status r (rmfile_status::success);
+
+    if (::unlink (p.string ().c_str ()) != 0)
+    {
+      if (errno == ENOENT || errno == ENOTDIR)
+        r = rmfile_status::not_exist;
+      else
+        throw system_error (errno, system_category ());
+    }
+
+    return r;
+  }
+}