From cec08e86097f404f95c5494d143496d4da6901ef Mon Sep 17 00:00:00 2001
From: pjht <terppa05@gmail.com>
Date: Sat, 9 Feb 2019 17:55:06 -0600
Subject: [PATCH] VGA can now write strings

---
 drivers/i386/vga.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/drivers/i386/vga.c b/drivers/i386/vga.c
index 07971eb..c5077d8 100644
--- a/drivers/i386/vga.c
+++ b/drivers/i386/vga.c
@@ -1,9 +1,12 @@
 #include <grub/text_fb_info.h>
 #include "../vga.h"
+#include <string.h>
 #define xy_to_indx(x,y) ((x+(y*height))*2)
 char* screen;
 int width;
 int height;
+int x;
+int y;
 vga_colors fg_color;
 vga_colors bg_color;
 
@@ -13,6 +16,8 @@ void vga_set_char(int x,int y,char c) {
 }
 
 void vga_init(text_fb_info framebuffer_info) {
+  x=0;
+  y=0;
   fg_color=VGA_WHITE;
   bg_color=VGA_BLACK;
   screen=framebuffer_info.address;
@@ -28,3 +33,28 @@ void vga_clear() {
     }
   }
 }
+
+void vga_write_string(const char* string) {
+  for (int i=0;i<strlen(string);i++) {
+    char c=string[i];
+    if (c=='\n') {
+      x=0;
+      y++;
+    } else {
+      vga_set_char(x,y,c);
+      x++;
+    }
+    if (x==width) {
+      x=0;
+      y++;
+    }
+    if (y==height) {
+      x=0;
+      y=0;
+      char* pg1=(char*)((uint32_t)screen+0xfa0);
+      memcpy(pg1,&screen[xy_to_indx(0,1)],xy_to_indx(0,24));
+      vga_clear();
+      memcpy(&screen,pg1,xy_to_indx(0,25));
+    }
+  }
+}