From 37d92a552ef9afbef4095f2aff83587f5ebf204d Mon Sep 17 00:00:00 2001
From: Patrick Williams <iawillia@us.ibm.com>
Date: Wed, 19 May 2010 16:41:11 -0500
Subject: Full vargs printk.

---
 src/kernel/console.C | 233 ++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 231 insertions(+), 2 deletions(-)

(limited to 'src/kernel/console.C')

diff --git a/src/kernel/console.C b/src/kernel/console.C
index a2ad0ffe2..06cd98e2b 100644
--- a/src/kernel/console.C
+++ b/src/kernel/console.C
@@ -1,5 +1,6 @@
 #include <util/singleton.H>
 #include <kernel/console.H>
+#include <stdarg.h>
 
 static char kernel_printk_buffer[Console::BUFFER_SIZE];
 
@@ -17,12 +18,240 @@ int Console::putc(int c)
     }
 }
 
-void printk(const char* str)
+class ConsoleTraits
 {
+    public:
+	enum trait { NONE, HEX, DEC,  };
+};
+
+template <typename _T, ConsoleTraits::trait _S = ConsoleTraits::NONE>
+class ConsoleDisplay
+{
+    public:
+	static void display(Console& c, _T value) {};
+};
+
+template <>
+class ConsoleDisplay<char, ConsoleTraits::NONE>
+{
+    public:
+	static void display(Console&c, char value)
+	{
+	    c.putc(value);
+	}
+};
+
+template <typename _T>
+class ConsoleDisplay<_T, ConsoleTraits::DEC>
+{
+    public:
+	static void display(Console&c, _T value)
+	{
+	    if (value == 0)
+	    {
+		c.putc('0');
+	    }
+	    else if (value < 0)
+	    {
+		c.putc('-');
+		value *= -1;
+	    }
+	    else
+		subdisplay(c, value);
+	}
+
+	static void subdisplay(Console&c, _T value)
+	{
+	    if (value != 0)
+	    {
+		subdisplay(c, value / 10);
+		c.putc('0' + (value % 10));
+	    }
+	}
+};
+
+template<typename _T>
+class ConsoleDisplay<_T, ConsoleTraits::HEX>
+{
+    public:
+	static void display(Console&c, _T value)
+	{
+	    size_t length = sizeof(_T) * 2;
+	    subdisplay(c, value, length);
+	}
+
+	static void subdisplay(Console&c, _T value, size_t length)
+	{
+	    if (length == 0) return;
+	    subdisplay(c, value / 16, length-1);
+	    char nibble = value % 16;
+	    if (nibble >= 0x0a)
+		c.putc('A' + (nibble - 0x0a));
+	    else
+		c.putc('0' + nibble);
+	}
+};
+
+void printk(const char* str, ...)
+{
+    va_list args;
+    va_start(args, str);
+
     Console& console = Singleton<Console>::instance();
+    
+    bool format = false;
+    int size;
+
     while('\0' != *str)
     {
-	console.putc(*str);
+	if (('%' == *str) || (format))
+	switch (*str)
+	{
+	    case '%':
+		{
+		    if (format)
+		    {
+			ConsoleDisplay<char>::display(console, '%');
+		    }
+		    else
+		    {
+			format = true;
+			size = 2;
+		    }
+		    break;
+		}
+	    case 'c':
+		{
+		    format = false;
+		    ConsoleDisplay<char>
+			::display(console,
+				  (char)va_arg(args,int));
+		    break;
+		}
+	    case 'h':
+		{
+		    size--;
+		    break;
+		}
+	    case 'l':
+		{
+		    size++;
+		    break;
+		}
+	    case 'd': // decimal
+		{
+		    format = false;
+		    switch(size)
+		    {
+			case 0:
+			    ConsoleDisplay<char, ConsoleTraits::DEC>
+				::display(console,
+					  (char)va_arg(args,int));
+			    break;
+
+			case 1:
+			    ConsoleDisplay<short, ConsoleTraits::DEC>
+				::display(console,
+					  (short)va_arg(args,int));
+			    break;
+
+			case 2:
+			case 3:
+			    ConsoleDisplay<int, ConsoleTraits::DEC>
+				::display(console,
+					  va_arg(args,int));
+			    break;
+
+			case 4:
+			    ConsoleDisplay<long, ConsoleTraits::DEC>
+				::display(console,
+					  va_arg(args,long));
+			    break;
+		    }
+		    break;
+		}
+	    case 'u': // unsigned decimal
+		{
+		    format = false;
+		    switch(size)
+		    {
+			case 0:
+			    ConsoleDisplay<unsigned char, ConsoleTraits::DEC>
+				::display(console,
+					  (unsigned char)
+					    va_arg(args,unsigned int));
+			    break;
+
+			case 1:
+			    ConsoleDisplay<unsigned short, ConsoleTraits::DEC>
+				::display(console,
+					  (unsigned short)
+					    va_arg(args,unsigned int));
+			    break;
+
+			case 2:
+			case 3:
+			    ConsoleDisplay<unsigned int, ConsoleTraits::DEC>
+				::display(console,
+					  va_arg(args,unsigned int));
+			    break;
+
+			case 4:
+			    ConsoleDisplay<unsigned long, ConsoleTraits::DEC>
+				::display(console,
+					  va_arg(args,unsigned long));
+			    break;
+		    }
+		    break;
+		}
+	    case 'x': // unsigned hex
+	    case 'X':
+		{
+		    format = false;
+		    switch(size)
+		    {
+			case 0:
+			    ConsoleDisplay<unsigned char, ConsoleTraits::HEX>
+				::display(console,
+					  (unsigned char)
+					    va_arg(args,unsigned int));
+			    break;
+
+			case 1:
+			    ConsoleDisplay<unsigned short, ConsoleTraits::HEX>
+				::display(console,
+					  (unsigned short)
+					    va_arg(args,unsigned int));
+			    break;
+
+			case 2:
+			case 3:
+			    ConsoleDisplay<unsigned int, ConsoleTraits::HEX>
+				::display(console,
+					  va_arg(args,unsigned int));
+			    break;
+
+			case 4:
+			    ConsoleDisplay<unsigned long, ConsoleTraits::HEX>
+				::display(console,
+					  va_arg(args,unsigned long));
+			    break;
+		    }
+		    break;
+		}
+	    case 's': // string
+		{
+		    format = false;
+		    ConsoleDisplay<char*>::display(console,
+						   (char*)va_arg(args,void*));
+		    break;
+		}
+	}
+	else
+	    ConsoleDisplay<char>::display(console, *str);
+
 	str++;
     }
+
+    va_end(args);
 }
-- 
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