Add support for console I/O

[libs/core.git] / source / console.cpp

diff --git a/source/console.cpp b/source/console.cpp
new file mode 100644 (file)
index 0000000..eb7ac4b
--- /dev/null
+++ b/source/console.cpp
@@ -0,0 +1,173 @@
+/* $Id$
+
+This file is part of libmspio
+Copyright © 2008  Mikko Rasa, Mikkosoft Productions
+Distributed under the LGPL
+*/
+
+#ifndef WIN32
+#include <errno.h>
+#include <fcntl.h>
+#include <termios.h>
+#endif
+#include <msp/core/except.h>
+#include "console.h"
+
+namespace {
+
+#ifndef WIN32
+termios orig_attr;
+#endif
+
+} // namespace
+
+namespace Msp {
+namespace IO {
+
+Console::Console(unsigned n)
+{
+       if(n>2)
+               throw InvalidParameterValue("Invalid parameter for Console::Console");
+
+       mode=(n==0 ? M_READ : M_WRITE);
+
+#ifdef WIN32
+       switch(n)
+       {
+       case 0: handle=GetStdHandle(STD_INPUT_HANDLE); break;
+       case 1: handle=GetStdHandle(STD_OUTPUT_HANDLE); break;
+       case 2: handle=GetStdHandle(STD_ERROR_HANDLE); break;
+       }
+#else
+       handle=n;
+
+       if(handle==0)
+               tcgetattr(handle, &orig_attr);
+#endif
+}
+
+Console::~Console()
+{
+#ifndef WIN32
+       if(handle==0)
+               tcsetattr(handle, TCSADRAIN, &orig_attr);
+#endif
+}
+
+void Console::set_block(bool b)
+{
+#ifdef WIN32
+       // XXX Dunno how to do this in win32
+       (void)b;
+#else
+       int flags=fcntl(0, F_GETFL);
+       flags=(flags&~O_NONBLOCK) | (b?0:O_NONBLOCK);
+       fcntl(0, F_SETFL, flags);
+#endif
+}
+
+void Console::set_local_echo(bool e)
+{
+       if(!(mode&M_READ))
+               throw InvalidState("Local echo can only be set on input console");
+
+#ifdef WIN32
+       DWORD m;
+       GetConsoleMode(handle, &m);
+       SetConsoleMode(handle, (m&~ENABLE_ECHO_INPUT) | (e?ENABLE_ECHO_INPUT:0));
+#else
+       termios t;
+       tcgetattr(0, &t);
+       t.c_lflag=(t.c_lflag&~ECHO) | (e?ECHO:0);
+       tcsetattr(0, TCSADRAIN, &t);
+#endif
+}
+
+void Console::set_line_buffer(bool l)
+{
+       if(!(mode&M_READ))
+               throw InvalidState("Line buffering can only be set on input console");
+
+#ifdef WIN32
+       DWORD m;
+       GetConsoleMode(handle, &m);
+       SetConsoleMode(handle, (m&~ENABLE_LINE_INPUT) | (l?ENABLE_LINE_INPUT:0));
+#else
+       // XXX ICANON does more than just set line buffering, may need a bit more thought
+       termios t;
+       tcgetattr(0, &t);
+       t.c_lflag=(t.c_lflag&~ICANON) | (l?ICANON:0);
+       tcsetattr(0, TCSADRAIN, &t);
+#endif
+}
+
+Handle Console::get_event_handle()
+{
+       return 0;
+}
+
+unsigned Console::do_write(const char *buf, unsigned len)
+{
+       if(!(mode&M_WRITE))
+               throw InvalidState("Console is not writable");
+
+#ifdef WIN32
+       DWORD ret;
+       if(!WriteFile(handle, buf, len, &ret, 0))
+               throw SystemError("Writing to console failed", GetLastError());
+#else
+       int ret=::write(1, buf, len);
+       if(ret==-1)
+               throw SystemError("Writing to console failed", errno);
+#endif
+
+       return ret;
+}
+
+unsigned Console::do_read(char *buf, unsigned len)
+{
+       if(!(mode&M_READ))
+               throw InvalidState("Console is not readable");
+
+#ifdef WIN32
+       DWORD ret;
+       if(!ReadFile(handle, buf, len, &ret, 0))
+               throw SystemError("Reading from console failed", GetLastError());
+#else
+       int ret=::read(0, buf, len);
+       if(ret==-1)
+       {
+               if(errno==EAGAIN)
+                       return 0;
+               else
+                       throw SystemError("Reading from console failed", errno);
+       }
+       else if(ret==0)
+               eof_flag=true;
+#endif
+
+       return ret;
+}
+
+Console &Console::instance(unsigned n)
+{
+       static Console in(0);
+       static Console out(1);
+       static Console err(2);
+
+       switch(n)
+       {
+       case 0: return in;
+       case 1: return out;
+       case 2: return err;
+       }
+
+       throw InvalidParameterValue("Unknown Console instance requested");
+}
+
+Console &cin=Console::instance(0);
+Console &cout=Console::instance(1);
+Console &cerr=Console::instance(2);
+
+} // namespace IO
+} // namespace Msp