From 4f0bc05a74e43cab06a8cdd2fbcc5db0bf46601d Mon Sep 17 00:00:00 2001
From: Marian Ohligs <marian.ohligs@rwth-aachen.de>
Date: Mon, 23 May 2011 12:56:14 +0200
Subject: [PATCH] add basic support of scanf, get ...

---
 arch/x86/include/asm/kb.h | 10 ++++++++++
 arch/x86/kernel/kb.c      | 19 +++++++++++++++++++
 drivers/stdin/stdin.c     | 19 ++++++++++++++++---
 fs/initrd.c               |  1 -
 newlib/examples/hello.c   | 21 ++++-----------------
 5 files changed, 49 insertions(+), 21 deletions(-)

diff --git a/arch/x86/include/asm/kb.h b/arch/x86/include/asm/kb.h
index 74d66d6c..99991d8b 100644
--- a/arch/x86/include/asm/kb.h
+++ b/arch/x86/include/asm/kb.h
@@ -43,6 +43,16 @@ extern "C" {
  */
 void keyboard_init(void);
 
+typedef struct
+{
+	char* buffer;
+	size_t maxsize;
+	size_t size;
+	tid_t tid;
+} kb_buffer_t;
+
+kb_buffer_t kb_buffer;
+
 #endif
 
 #ifdef __cplusplus
diff --git a/arch/x86/kernel/kb.c b/arch/x86/kernel/kb.c
index ac07d146..ce377862 100644
--- a/arch/x86/kernel/kb.c
+++ b/arch/x86/kernel/kb.c
@@ -24,6 +24,16 @@
 
 #ifdef CONFIG_KEYBOARD
 
+kb_buffer_t kb_buffer = {NULL, 0, 0, 0 };
+
+kb_flush() {
+	kfree(kb_buffer.buffer, (kb_buffer.maxsize * sizeof(char)));	
+	kb_buffer.buffer = NULL;
+	kb_buffer.size = 0;
+	kb_buffer.maxsize = 0;
+	kb_buffer.tid = 0; 
+}
+
 /* 
  * KBDUS means US Keyboard Layout. This is a scancode table
  * used to layout a standard US keyboard. I have left some
@@ -99,6 +109,15 @@ static void keyboard_handler(struct state *r)
 		 * you would add 128 to the scancode when you look for it 
 		 */
 		kputchar(kbdus[scancode]);
+		if (kb_buffer.size <= kb_buffer.maxsize) {
+			memcpy(kb_buffer.buffer + kb_buffer.size, &kbdus[scancode], 1);
+			kb_buffer.size++;
+		}
+		if (scancode == 28 || scancode == 15 || kb_buffer.size >= kb_buffer.maxsize) {
+			wakeup_task(kb_buffer.tid);
+			reschedule();
+		}
+
 	}
 }
 
diff --git a/drivers/stdin/stdin.c b/drivers/stdin/stdin.c
index 07f7a4df..238f6c24 100644
--- a/drivers/stdin/stdin.c
+++ b/drivers/stdin/stdin.c
@@ -23,14 +23,27 @@
 #include <metalsvm/errno.h>
 #include <metalsvm/fs.h>
 #include <metalsvm/spinlock.h>
+#include <asm/kb.h>
+
 
 /* Implementation of a simple stdin device */
 
 static ssize_t stdin_read(vfs_node_t* node, uint8_t* buffer, size_t size, off_t offset)
 {
-	while(size) {
-		size -= kputs((char*)buffer);
-	}
+	kb_buffer.buffer = kmalloc(size * sizeof(char)); 
+	kb_buffer.maxsize = size;
+	kb_buffer.size = 0;
+	kb_buffer.tid = per_core(current_task)->id;
+	block_task(per_core(current_task)->id);
+	reschedule();
+	size = kb_buffer.size;
+	
+	memcpy(buffer, kb_buffer.buffer, size); 
+
+	/*cleaning  up */
+	kb_flush();
+
+	//kprintf("Size: %i, offset: %i, buffer: %s", size, buffer, offset);
 	return size;
 }
 
diff --git a/fs/initrd.c b/fs/initrd.c
index ad1aef3e..2c2a7350 100644
--- a/fs/initrd.c
+++ b/fs/initrd.c
@@ -144,7 +144,6 @@ static ssize_t initrd_write(vfs_node_t* node, uint8_t* buffer, size_t size, off_
 	 * for the next block.
          */
 	memcpy(data + offset, buffer, size);
-
 	return size;
 }
 
diff --git a/newlib/examples/hello.c b/newlib/examples/hello.c
index c0336af9..fd357d5f 100644
--- a/newlib/examples/hello.c
+++ b/newlib/examples/hello.c
@@ -28,22 +28,9 @@ extern int errno;
 int main(int argc, char** argv)
 {
 	int i;
-	long offset_x = 5;
-	char* str = (char *)malloc(50 * sizeof(char));
-	FILE* testfile;
-	testfile = fopen("/bin/test", "w+r");
-	setbuf(testfile, NULL);
+	char* str = (char *)malloc(40000 * sizeof(char));
+	scanf("%s", str);
+	printf("SCANF: %s", str);
 	fflush(NULL);
-	fwrite("wsx", 3, 1, testfile);
-	fseek(testfile, 2, SEEK_CUR);
-	fwrite("nextnextnext", 1, 10, testfile);
-
-	fclose(testfile);
-
-	testfile = fopen("/bin/test", "w+r");
-	setbuf(testfile, NULL);
-	fread(str, 2, 40, testfile);
-	printf("reading (/bin/test):%s\n", str);
-
-	return errno;
+return errno;
 }