Added debug_strlcpy() for use in the kernel debugger.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33380 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/kernel/debug.h

@@ -131,6 +131,7 @@ extern bool		debug_is_kernel_memory_accessible(addr_t address, size_t size,
 extern int		debug_call_with_fault_handler(jmp_buf jumpBuffer,
 					void (*function)(void*), void* parameter);
 extern status_t	debug_memcpy(void* to, const void* from, size_t size);
+extern ssize_t	debug_strlcpy(char* to, const char* from, size_t size);
 
 extern char		kgetc(void);
 extern void		kputs(const char *string);

src/system/kernel/debug/debug.cpp

@@ -55,6 +55,13 @@ struct debug_memcpy_parameters {
 	size_t		size;
 };
 
+struct debug_strlcpy_parameters {
+	char*		to;
+	const char*	from;
+	size_t		size;
+	size_t		result;
+};
+
 
 static const char* const kKDLPrompt = "kdebug> ";
 
@@ -1180,6 +1187,16 @@ debug_memcpy_trampoline(void* _parameters)
 }
 
 
+static void
+debug_strlcpy_trampoline(void* _parameters)
+{
+	debug_strlcpy_parameters* parameters
+		= (debug_strlcpy_parameters*)_parameters;
+	parameters->result = strlcpy(parameters->to, parameters->from,
+		parameters->size);
+}
+
+
 void
 call_modules_hook(bool enter)
 {
@@ -1522,6 +1539,22 @@ debug_memcpy(void* to, const void* from, size_t size)
 }
 
 
+/*!	Similar to user_strlcpy(), but can only be invoked from within the kernel
+	debugger (and must not be used outside).
+*/
+ssize_t
+debug_strlcpy(char* to, const char* from, size_t size)
+{
+	debug_strlcpy_parameters parameters = {to, from, size};
+
+	if (debug_call_with_fault_handler(gCPU[sDebuggerOnCPU].fault_jump_buffer,
+			&debug_strlcpy_trampoline, &parameters) != 0) {
+		return B_BAD_ADDRESS;
+	}
+	return parameters.result;
+}
+
+
 //	#pragma mark - public API