[pypy-svn] r30734 - pypy/dist/pypy/translator/cli/src

[antocuni at codespeak.net]

Author: antocuni
Date: Sat Jul 29 19:13:12 2006
New Revision: 30734

Modified:
   pypy/dist/pypy/translator/cli/src/ll_os.cs
Log:
Added basic support for file descriptor operations to
pypylib-framework.dll.

It is little more that a hack, because it uses fake file descriptors
and a dictionary for mapping that to the underlying FileStream object.



Modified: pypy/dist/pypy/translator/cli/src/ll_os.cs
==============================================================================
--- pypy/dist/pypy/translator/cli/src/ll_os.cs	(original)
+++ pypy/dist/pypy/translator/cli/src/ll_os.cs	Sat Jul 29 19:13:12 2006
@@ -1,10 +1,25 @@
 using System;
+using System.IO;
+using System.Collections.Generic;
+using System.Diagnostics;
 using pypy.runtime;
 
 namespace pypy.builtin
 {
     public class ll_os
     {
+        private static Dictionary<int, FileStream> FileDescriptors = new Dictionary<int, FileStream>();
+        private static int fdcount = 2; // 0, 1 and 2 are already used by stdin, stdout and stderr
+        private const int O_RDONLY = 0;
+        private const int O_WRONLY = 1;
+        private const int O_RDWR = 2;
+        private const int O_CREAT = 64;
+        private const int O_APPEND = 1024;
+
+        private const int S_IFMT = 61440;
+        private const int S_IFDIR = 16384;
+        private const int S_IFREG = 32768;
+
         public static string ll_os_getcwd()
         {
             return System.IO.Directory.GetCurrentDirectory();
@@ -12,12 +27,37 @@
 
         public static int ll_os_open(string name, int flag, int mode)
         {
-            //PrebuiltGraphs.raiseOSError(2); // ENOENT
-            return -1; // can't be reached
+            FileAccess f_access = FileAccess.Read;
+            FileMode f_mode = FileMode.Open;
+            Console.Error.WriteLine("ll_os_open {0}", flag);
+            if ((flag & O_RDWR) != 0) {
+                throw new ApplicationException("Read/Write mode is not supported, yet");
+            }
+            else if ((flag & O_WRONLY) != 0) {
+                f_access = FileAccess.Write;
+                if ((flag & O_APPEND) != 0)
+                    f_mode = FileMode.Append;
+                else
+                    f_mode = FileMode.Create;
+            }
+            else {
+                f_access = FileAccess.Read;
+                if ((flag & O_CREAT) != 0)
+                    f_mode = FileMode.OpenOrCreate;
+                else
+                    f_mode = FileMode.Open;
+            }
+            fdcount++;
+            FileDescriptors[fdcount] = new FileStream(name, f_mode, f_access);
+            return fdcount;
         }
 
         public static void ll_os_close(int fd)
         {
+            FileStream stream = FileDescriptors[fd];
+            Debug.Assert(stream != null);
+            stream.Close();
+            FileDescriptors.Remove(fd);
         }
 
         public static int ll_os_write(int fd, string buffer)
@@ -26,8 +66,13 @@
                 Console.Write(buffer);
             else if (fd == 2)
                 Console.Error.Write(buffer);
-            else
-                throw new ApplicationException(string.Format("Wrong file descriptor: {0}", fd));
+            else {
+                FileStream stream = FileDescriptors[fd];
+                Debug.Assert(stream != null);
+                StreamWriter w = new StreamWriter(stream);
+                w.Write(buffer);
+                w.Flush();
+            }
             return buffer.Length;
         }
 
@@ -38,19 +83,39 @@
 
         public static string ll_os_read(int fd, int count)
         {
-             if (fd == 0) {
-                 char[] buf = new char[count];
-                 int n = Console.In.Read(buf, 0, count);
-                 return new string(buf, 0, n);
+            TextReader reader;
+             if (fd == 0)
+                 reader = Console.In;
+             else {
+                 FileStream stream = FileDescriptors[fd];
+                 Debug.Assert(stream != null);
+                 reader = new StreamReader(stream);
              }
-             else
-                 throw new ApplicationException(string.Format("Wrong file descriptor: {0}", fd));
+             char[] buf = new char[count];
+             int n = reader.Read(buf, 0, count);
+             return new string(buf, 0, n);
         }
 
         public static Record_Stat_Result ll_os_stat(string path)
         {
-            Record_Stat_Result res = new Record_Stat_Result();
-            return res;
+            FileInfo f = new FileInfo(path);
+            if (f.Exists) {
+                Record_Stat_Result res = new Record_Stat_Result();
+                TimeSpan t = File.GetLastWriteTime(path) - new DateTime(1970, 1, 1);
+                res.item0 ^= S_IFREG;
+                res.item6 = (int)f.Length;
+                res.item8 = (int)t.TotalSeconds;
+                return res;
+            }
+
+            DirectoryInfo d = new DirectoryInfo(path);
+            if (d.Exists) {
+                Record_Stat_Result res = new Record_Stat_Result();
+                res.item0 ^= S_IFDIR;
+                return res;
+            }
+            // TODO: path is not a file nor a dir, should raise OSError
+            return null;
         }
     }
 }