129 lines
2.5 KiB
C#
129 lines
2.5 KiB
C#
//
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// Helper for Console to allow indirect access to `stdout` using NSLog
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//
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// Authors:
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// Sebastien Pouliot <sebastien@xamarin.com>
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//
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// Copyright 2012-2014 Xamarin Inc. All rights reserved.
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//
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#if MONOTOUCH
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using System;
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using System.IO;
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using System.Runtime.InteropServices;
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using System.Text;
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namespace System {
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public static partial class Console {
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class NSLogWriter : TextWriter {
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[DllImport ("__Internal", CharSet=CharSet.Unicode)]
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extern static void xamarin_log (string s);
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[DllImport ("/usr/lib/libSystem.dylib")]
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extern static /* ssize_t */ IntPtr write (int fd, byte [] buffer, /* size_t */ IntPtr n);
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StringBuilder sb;
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public NSLogWriter ()
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{
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sb = new StringBuilder ();
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}
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public override System.Text.Encoding Encoding {
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get { return System.Text.Encoding.UTF8; }
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}
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static void direct_write_to_stdout (string s)
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{
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byte [] b = Encoding.Default.GetBytes (s);
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var len = (IntPtr) b.Length;
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while ((int) write (1, b, len) == -1 && Marshal.GetLastWin32Error () == /* EINTR*/ 4)
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;
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}
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public override void Flush ()
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{
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string s;
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lock (sb) {
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s = sb.ToString ();
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sb.Length = 0;
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}
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try {
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xamarin_log (s);
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}
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catch (Exception) {
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try {
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direct_write_to_stdout (s);
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direct_write_to_stdout (Environment.NewLine);
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} catch (Exception){}
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}
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}
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// minimum to override - see http://msdn.microsoft.com/en-us/library/system.io.textwriter.aspx
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public override void Write (char value)
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{
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try {
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lock (sb)
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sb.Append (value);
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}
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catch (Exception) {
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}
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}
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// optimization (to avoid concatening chars)
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public override void Write (string value)
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{
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try {
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lock (sb) {
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sb.Append (value);
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if (EndsWithNewLine (sb))
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Flush ();
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}
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}
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catch (Exception) {
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}
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}
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/* Called from TextWriter:WriteLine(string) */
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public override void Write(char[] buffer, int index, int count) {
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try {
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lock (sb) {
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sb.Append (buffer, index, count);
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if (EndsWithNewLine (sb))
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Flush ();
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}
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}
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catch (Exception) {
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}
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}
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bool EndsWithNewLine (StringBuilder value)
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{
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if (value.Length < CoreNewLine.Length)
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return false;
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for (int i = 0, v = value.Length - CoreNewLine.Length; i < CoreNewLine.Length; ++i, ++v) {
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if (value [v] != CoreNewLine [i])
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return false;
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}
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return true;
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}
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public override void WriteLine ()
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{
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try {
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Flush ();
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}
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catch (Exception) {
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}
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}
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}
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}
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}
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#endif
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