From 71402d670b1de4f4db7c1768e92ac1f723b51d9a Mon Sep 17 00:00:00 2001
From: John Hodge <tpg@mutabah.net>
Date: Tue, 19 Aug 2014 07:51:10 +0800
Subject: [PATCH] Kernel/libc - Print address of invalid strings

---
 KernelLand/Kernel/libc.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/KernelLand/Kernel/libc.c b/KernelLand/Kernel/libc.c
index fba30479..572184d9 100644
--- a/KernelLand/Kernel/libc.c
+++ b/KernelLand/Kernel/libc.c
@@ -381,7 +381,7 @@ int vsnprintf(char *__s, const size_t __maxlen, const char *__format, va_list ar
 				break;
 			}
 			p = va_arg(args, char*);	// Get Argument
-			if( !p || !CheckString(p) )	p = "(inval)";	// Avoid #PFs  
+			if( p && !CheckString(p) )	goto invalString;	// Avoid #PFs  
 		printString:
 			if(!p)		p = "(null)";
 			len = strlen(p);
@@ -389,6 +389,20 @@ int vsnprintf(char *__s, const size_t __maxlen, const char *__format, va_list ar
 			while(*p && precision--) { PUTCH(*p); p++;} 
 			if( bPadLeft )	while(len++ < minSize)	PUTCH(pad);
 			break;
+		invalString:	
+			PUTCH('(');PUTCH('i');PUTCH('n');PUTCH('v');PUTCH('a');	PUTCH('l');PUTCH(':');
+			PUTCH('*');PUTCH('0');PUTCH('x');
+			val = (tVAddr)p;
+			for( len = BITS/4; len -- && ((val>>(len*4))&15) == 0; )
+				;
+			len ++;
+			if( len == 0 )
+				PUTCH( '0' );
+			else
+				while( len -- )
+					PUTCH( cUCDIGITS[ (val>>(len*4))&15 ] );
+			PUTCH(')');
+			break;
 		
 		case 'C':	// Non-Null Terminated Character Array
 			p = va_arg(args, char*);
-- 
2.20.1