Add: framebuffer color output functions

kmain.c

@@ -7,25 +7,24 @@
 int kmain(int retvalue)
 {
   
-  gdt_install();
-  idt_install();
-  isr_install();
-
-  // serial testing
-
   init_serial();
-  
   log("serial connection established", 3);
+  gdt_install();
   log("initialized GDT entries", 2);
-  log("kernel started", 2);
+  idt_install();
   log("initialized IDT", 2);
+  isr_install();
   log("initialized ISRs", 3);
+ 
+  log("kernel started", 2);
 
   clear();
 
   // printf testing
 
   // TODO: Framebuffer upgrade: color output
+  // TODO: Serial printf to dump registers on kernel panic
+  // TODO: Fix scrolling bug (framebuffer driver)
 
   int age = 34;
   int problems = 124;
@@ -41,10 +40,14 @@ int kmain(int retvalue)
   printf("such hex %x %X\n", 0xcafe, 0xdeadbeef);
   
   printf("such pointer %p\n", (void*)0xcafe1234);
- 
+
+  for (int i=0; i<10; i++)
+  {
+    colorputs("hello colorful world!!\n", i);
+  }
   // Div by zero exception
   
-  printf("Lalala, what a beautiful day! %d", 4/0);
+  //printf("Lalala, what a beautiful day! %d", 4/0);
 
   return retvalue;
 }

stdio.c

@@ -102,6 +102,33 @@ void putc(char c)
   move_cursor(VGA_X, VGA_Y);
 }
 
+void colorputc(char c, unsigned int color)
+{
+  switch(c)
+  {
+    case '\n':
+      VGA_X = 0;
+      VGA_Y++;
+      break;
+    case '\r':
+      VGA_X = 0;
+      break;
+    default:
+      putchar(VGA_X, VGA_Y, c);
+      putcolor(VGA_X, VGA_Y, color);
+      VGA_X++;
+      break;
+  }
+
+  if (VGA_X >= VGA_WIDTH)
+  {
+    VGA_Y++;
+    VGA_X = 0;
+  }
+  if (VGA_Y >= VGA_HEIGHT) scroll(1);
+  move_cursor(VGA_X, VGA_Y);
+}
+
 void puts(const char* str)
 {
   while (*str)
@@ -111,6 +138,15 @@ void puts(const char* str)
   }
 }
 
+void colorputs(const char* str, unsigned int color)
+{
+  while (*str)
+  {
+    colorputc(*str, color);
+    str++;
+  }
+}
+
 void printf(const char* fmt, ...)
 {
   int* argp = (int*) &fmt;

stdio.h

@@ -14,12 +14,14 @@
 void move_cursor(int x, int y);
 void putchar(int x, int y, char c);
 void puts(const char* str);
+void colorputs(const char* str, unsigned int color);
 void clear(void);
 void putcolor(int x, int y, unsigned int color);
 char getchar(int x, int y);
 unsigned int getcolor(int x, int y);
 void scroll(int lines);
 void putc(char c);
+void colorputc(char c, unsigned int color);
 
 #define PRINTF_STATE_START 0
 #define PRINTF_STATE_LENGTH 1