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