* Fixed the semantics of [v]snprintf(): If the buffer is not large enough,

the function shall nevertheless return the length of the string that would
  be written, if the buffer were large enough.
  Added a touch of C++ while doing that. :-)
* Fixed the instances in boot loader, kernel, and kernel modules where the
  wrong semantics were expected. The majority of uses actually.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34826 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/system/kernel/debug/debug_commands.cpp

@@ -7,12 +7,15 @@
  * Distributed under the terms of the NewOS License.
  */
 
+
 #include "debug_commands.h"
 
 #include <setjmp.h>
 #include <stdio.h>
 #include <string.h>
 
+#include <algorithm>
+
 #include <KernelExport.h>
 
 #include <debug.h>
@@ -111,8 +114,12 @@ public:
 			return;
 
 		// print directly into the buffer
-		fBufferSize += vsnprintf(fBuffer + fBufferSize,
-			fBufferCapacity - fBufferSize, format, args);
+		if (fBufferSize < fBufferCapacity) {
+			size_t totalBytes = vsnprintf(fBuffer + fBufferSize,
+				fBufferCapacity - fBufferSize, format, args);
+			fBufferSize += std::min(totalBytes,
+				fBufferCapacity - fBufferSize - 1);
+		}
 
 		// execute every complete line
 		fBuffer[fBufferSize] = '\0';