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//
// Mono.Unix/UnixPath.cs
//
// Authors:
// Jonathan Pryor (jonpryor@vt.edu)
//
// (C) 2004 Jonathan Pryor
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Collections;
using System.Text;
using Mono.Unix;
namespace Mono.Unix {
public sealed class UnixPath
{
private UnixPath () {}
public static readonly char DirectorySeparatorChar = '/';
public static readonly char AltDirectorySeparatorChar = '/';
public static readonly char[] InvalidPathChars = new char[]{'\0'};
public static readonly char PathSeparator = ':';
public static readonly char VolumeSeparatorChar = '/';
public static string Combine (string path1, params string[] paths)
{
if (path1 == null)
throw new ArgumentNullException ("path1");
if (paths == null)
throw new ArgumentNullException ("paths");
if (path1.IndexOfAny (InvalidPathChars) != -1)
throw new ArgumentException ("Illegal characters in path", "path1");
int len = path1.Length + 1;
for (int i = 0; i < paths.Length; ++i) {
if (paths [i] == null)
throw new ArgumentNullException ("paths");
len += paths [i].Length + 1;
}
StringBuilder sb = new StringBuilder (len);
sb.Append (path1);
for (int i = 0; i < paths.Length; ++i)
Combine (sb, paths [i]);
return sb.ToString ();
}
private static void Combine (StringBuilder path, string part)
{
if (part.IndexOfAny (InvalidPathChars) != -1)
throw new ArgumentException ("Illegal characters in path", "path1");
char end = path [path.Length-1];
if (end != DirectorySeparatorChar &&
end != AltDirectorySeparatorChar &&
end != VolumeSeparatorChar)
path.Append (DirectorySeparatorChar);
path.Append (part);
}
public static string GetDirectoryName (string path)
{
CheckPath (path);
int lastDir = path.LastIndexOf (DirectorySeparatorChar);
if (lastDir > 0)
return path.Substring (0, lastDir);
return "";
}
public static string GetFileName (string path)
{
if (path == null || path.Length == 0)
return path;
int lastDir = path.LastIndexOf (DirectorySeparatorChar);
if (lastDir >= 0)
return path.Substring (lastDir+1);
return path;
}
public static string GetFullPath (string path)
{
path = _GetFullPath (path);
string [] dirs;
int lastIndex;
GetPathComponents (path, out dirs, out lastIndex);
return string.Join ("/", dirs, 0, lastIndex);
}
private static string _GetFullPath (string path)
{
if (path == null)
throw new ArgumentNullException ("path");
if (!IsPathRooted (path))
path = UnixDirectory.GetCurrentDirectory() + DirectorySeparatorChar + path;
return path;
}
private static void GetPathComponents (string path,
out string[] components, out int lastIndex)
{
string [] dirs = path.Split (DirectorySeparatorChar);
int target = 0;
for (int i = 0; i < dirs.Length; ++i) {
if (dirs [i] == "." || (i != 0 && dirs [i] == string.Empty)) continue;
else if (dirs [i] == "..") {
if (target != 0) --target;
}
else
dirs [target++] = dirs [i];
}
components = dirs;
lastIndex = target;
}
public static string GetPathRoot (string path)
{
if (path == null)
return null;
if (!IsPathRooted (path))
return "";
return "/";
}
public static string GetRealPath (string path)
{
path = _GetFullPath (path);
string [] dirs;
int lastIndex;
GetPathComponents (path, out dirs, out lastIndex);
StringBuilder realPath = new StringBuilder ();
for (int i = 0; i < dirs.Length; ++i) {
realPath.Append ("/").Append (dirs [i]);
string p = _GetRealPath (realPath.ToString());
realPath.Remove (0, realPath.Length);
realPath.Append (p);
}
return realPath.ToString ();
}
private static string _GetRealPath (string path)
{
StringBuilder buf = new StringBuilder (1024);
int r;
do {
r = Syscall.readlink (path, buf);
if (r == -1) {
Error e;
switch (e = Syscall.GetLastError()) {
case Error.EINVAL:
// path isn't a symbolic link
return path;
default:
UnixMarshal.ThrowExceptionForError (e);
break;
}
}
path = buf.ToString ();
} while (r == 0);
return path;
}
public static bool IsPathRooted (string path)
{
if (path == null || path.Length == 0)
return false;
return path [0] == DirectorySeparatorChar;
}
internal static void CheckPath (string path)
{
if (path == null)
throw new ArgumentNullException ();
if (path.IndexOfAny (UnixPath.InvalidPathChars) != -1)
throw new ArgumentException ("Invalid characters in path.");
}
}
}
// vim: noexpandtab
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