From ae5a068f621bed3eadb194bac2150884d7a925e9 Mon Sep 17 00:00:00 2001
From: PulkoMandy <pulkomandy@pulkomandy.tk>
Date: Mon, 16 Mar 2020 17:43:28 +0100
Subject: [PATCH] openfirmware: implement the in-memory log

We should probably make this code more platform-generic, the
implementation is very similar to the EFI one.

Change-Id: I17c9db933bfc2a81c96816dd6348d2d0c9627951
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2369
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
---
 .../boot/platform/openfirmware/debug.cpp      | 46 ++++++++++++++++---
 1 file changed, 39 insertions(+), 7 deletions(-)

diff --git a/src/system/boot/platform/openfirmware/debug.cpp b/src/system/boot/platform/openfirmware/debug.cpp
index ef31e66e64..78eb3cf132 100644
--- a/src/system/boot/platform/openfirmware/debug.cpp
+++ b/src/system/boot/platform/openfirmware/debug.cpp
@@ -1,16 +1,30 @@
 /*
  * Copyright 2003-2010, Axel Dörfler, axeld@pinc-software.de.
+ * Copyright 2016 Haiku, Inc. All rights reserved.
  * Distributed under the terms of the MIT License.
  */
 
 
 #include <stdarg.h>
+#include <string.h>
 
 #include <boot/platform.h>
 #include <boot/stdio.h>
 #include <platform/openfirmware/openfirmware.h>
 
 
+static char sBuffer[16384];
+static uint32 sBufferPosition;
+
+
+static void
+syslog_write(const char* buffer, size_t length)
+{
+	memcpy(sBuffer + sBufferPosition, buffer, length);
+	sBufferPosition += length;
+}
+
+
 extern "C" void
 panic(const char* format, ...)
 {
@@ -27,19 +41,37 @@ panic(const char* format, ...)
 }
 
 
-extern "C" void
-dprintf(const char* format, ...)
+static void
+dprintf_args(const char *format, va_list args)
 {
-	va_list list;
+	char buffer[512];
+	int length = vsnprintf(buffer, sizeof(buffer), format, args);
+	if (length == 0)
+		return;
 
-	va_start(list, format);
-	vprintf(format, list);
-	va_end(list);
+	syslog_write(buffer, length);
+	printf("%s", buffer);
 }
 
 
+extern "C" void
+dprintf(const char *format, ...)
+{
+	va_list args;
+
+	va_start(args, format);
+	dprintf_args(format, args);
+	va_end(args);
+}
+
+
+
+
 char*
 platform_debug_get_log_buffer(size_t* _size)
 {
-	return NULL;
+	if (_size != NULL)
+		*_size = sizeof(sBuffer);
+
+	return sBuffer;
 }