Add std

Makefile

@@ -1,4 +1,4 @@
-OBJECTS = io.o loader.o kmain.o fb.o serial.o
+OBJECTS = io.o loader.o kmain.o fb.o serial.o std.o
 CC = gcc
 CFLAGS = -m32 -nostdlib -nostdinc -fno-builtin -fno-stack-protector \
 			-nostartfiles -nodefaultlibs -Wall -Wextra -Werror -c

bochsrc.txt

@@ -1,5 +1,5 @@
 megs:            32
-display_library: sdl
+display_library: x
 romimage:        file=/usr/share/bochs/BIOS-bochs-latest
 vgaromimage:     file=/usr/share/bochs/VGABIOS-lgpl-latest
 ata0-master:     type=cdrom, path=os.iso, status=inserted
@@ -7,4 +7,4 @@ boot:            cdrom
 log:             bochslog.txt
 clock:           sync=realtime, time0=local
 cpu:             count=1, ips=1000000
-com1: enabled=1, mode=file, dev=com1.out
+com1: enabled=1, mode=file, dev=com1.out

fb.c

@@ -1,4 +1,3 @@
-#include "kmain.h"
 #include "fb.h"
 
 void fb_write_cell(unsigned int i, char c, unsigned char fg, unsigned char bg) {
@@ -15,6 +14,9 @@ void fb_move_cursor(unsigned short pos)
     outb(FB_DATA_PORT, pos & 0x00FF);
 }
 
+/*
+* Write frame buffer to screen 
+*/
 int fb_write(char *buf, unsigned int len) {
 
     for(int i = 0; i <= (int)len; i++) {
@@ -24,6 +26,15 @@ int fb_write(char *buf, unsigned int len) {
     return 0;
 }
 
+/** read_scan_code:
+     *  Reads a scan code from the keyboard
+     *
+     *  @return The scan code (NOT an ASCII character!)
+     */
+unsigned char read_scan_code(void) {
+    return inb(KBD_DATA_PORT);
+}
+
 void advance_cursor(void) {
     fb_move_cursor(get_cursor_position() + 1);
 }

fb.h

@@ -28,6 +28,8 @@
 #define VGA_COLOR_LIGHT_BROWN 14
 #define VGA_COLOR_WHITE 15
 
+#define KBD_DATA_PORT   0x60
+
 
 int fb_write(char *buf, unsigned int len);
 

kmain.c

@@ -1,8 +1,9 @@
 #include "kmain.h"
-#include "fb.h"
+#include "std.h"
+
 
 int main()
 {
-    fb_write("Hello", 4);
+    printf("Hello");
     return 0;
-}
+}

std.c

@@ -0,0 +1,17 @@
+#include "std.h"
+#include "fb.h"
+
+
+void printf(char *buf) {
+    fb_write(buf, strlen(buf));
+}
+
+void scanf(const char *format);
+
+unsigned int strlen(const char *str) {
+    const char *s;
+
+    for (s = str; *s; ++s)
+                ;
+    return (s - str);
+}

std.h

@@ -0,0 +1,10 @@
+#ifndef INCLUDE_STD
+#define INCLUDE_STD
+
+void printf(char *buf);
+
+void scanf(const char *format);
+
+unsigned int strlen(const char *buf);
+
+#endif