feat(hello world displayed)

src/main.c

@@ -7,7 +7,8 @@ void putc(char aChar);				/* print a single char on screen */
 void puts(char *aString); /* print a string on the screen */
 void puthex(int aNumber); /* print an Hex number on screen */
 
-void empty_irq(int_regs_t *r) {
+void empty_irq(int_regs_t *r)
+{
 }
 
 /* multiboot entry-point with datastructure as arg. */
@@ -33,39 +34,47 @@ void main(unsigned int * mboot_info)
 
   /* minimal setup done ! */
 
+  puts("Hello world\n\n");
 
-
-    for(;;) ; /* nothing more to do... really nothing ! */
+  for (;;)
+    ; /* nothing more to do... really nothing ! */
 }
 
 /* base address for the video output assume to be set as character oriented by the multiboot */
 unsigned char *video_memory = (unsigned char *)0xB8000;
 
 /* clear screen */
-void clear_screen() {
+void clear_screen()
+{
   int i;
-  for(i=0;i<80*25;i++) { 			/* for each one of the 80 char by 25 lines */
+  for (i = 0; i < 80 * 25; i++)
+  {                                           /* for each one of the 80 char by 25 lines */
     video_memory[i * 2 + 1] = 0x0F;           /* color is set to black background and white char */
     video_memory[i * 2] = (unsigned char)' '; /* character shown is the space char */
   }
 }
 
 /* print a string on the screen */
-void puts(char *aString) {
+void puts(char *aString)
+{
   char *current_char = aString;
-  while(*current_char!=0) {
+  while (*current_char != 0)
+  {
     putc(*current_char++);
   }
 }
 
 /* print an number in hexa */
 char *hex_digit = "0123456789ABCDEF";
-void puthex(int aNumber) {
+void puthex(int aNumber)
+{
   int i;
   int started = 0;
-  for(i=28;i>=0;i-=4) {
+  for (i = 28; i >= 0; i -= 4)
+  {
     int k = (aNumber >> i) & 0xF;
-    if(k!=0 || started) {
+    if (k != 0 || started)
+    {
       putc(hex_digit[k]);
       started = 1;
     }
@@ -76,7 +85,8 @@ void puthex(int aNumber) {
 int cursor_x = 0; /* here is the cursor position on X [0..79] */
 int cursor_y = 0; /* here is the cursor position on Y [0..24] */
 
-void setCursor() {
+void setCursor()
+{
   int cursor_offset = cursor_x + cursor_y * 80;
   _outb(0x3d4, 14);
   _outb(0x3d5, ((cursor_offset >> 8) & 0xFF));
@@ -84,20 +94,34 @@ void setCursor() {
   _outb(0x3d5, (cursor_offset & 0xFF));
 }
 
-void putc(char c) {
-  if(cursor_x>79) {
+void putc(char c)
+{
+  if (cursor_x > 79)
+  {
     cursor_x = 0;
     cursor_y++;
   }
-  if(cursor_y>24) {
+  if (cursor_y > 24)
+  {
     cursor_y = 0;
     clear_screen();
   }
-  switch(c) {					/* deal with a special char */
-    case '\r': cursor_x=0; break;		/* carriage return */
-    case '\n': cursor_x=0; cursor_y++; break; 	/* new ligne */	
-    case 0x8 : if(cursor_x>0) cursor_x--; break;/* backspace */
-    case 0x9 : cursor_x=(cursor_x+8)&~7; break;	/* tabulation */
+  switch (c)
+  { /* deal with a special char */
+  case '\r':
+    cursor_x = 0;
+    break; /* carriage return */
+  case '\n':
+    cursor_x = 0;
+    cursor_y++;
+    break; /* new ligne */
+  case 0x8:
+    if (cursor_x > 0)
+      cursor_x--;
+    break; /* backspace */
+  case 0x9:
+    cursor_x = (cursor_x + 8) & ~7;
+    break; /* tabulation */
     /* or print a simple character */
   default:
     video_memory[(cursor_x + 80 * cursor_y) * 2] = c;
@@ -106,5 +130,3 @@ void putc(char c) {
   }
   setCursor();
 }
-
-