From 00d5836c010e82463fff1db14e588be881cdac4e Mon Sep 17 00:00:00 2001
From: iximeow <me@iximeow.net>
Date: Mon, 28 Sep 2015 02:39:47 -0700
Subject: refactor to multi-file build

---
 src/output/vga_character.c | 49 ++++++++++++++++++++++++++++++++++++++++++++++
 src/output/vga_character.h | 16 +++++++++++++++
 2 files changed, 65 insertions(+)
 create mode 100644 src/output/vga_character.c
 create mode 100644 src/output/vga_character.h

(limited to 'src/output')

diff --git a/src/output/vga_character.c b/src/output/vga_character.c
new file mode 100644
index 0000000..bd59a97
--- /dev/null
+++ b/src/output/vga_character.c
@@ -0,0 +1,49 @@
+#include "vga_character.h"
+
+__asm__(".code16gcc\n");
+
+static short CURSOR_LOC = 0;
+static char* HEX_CHARS = "0123456789abcdef";
+
+void vga_graphics_write_str(char* str) {
+  while(*str) {
+    vga_graphics_write_with_attr(*str++, 7);
+  }
+}
+
+void vga_graphics_write_with_attr(char value, char attr) {
+  vga_graphics_write_at_offset(value, CURSOR_LOC++);
+  vga_graphics_write_at_offset(attr, CURSOR_LOC++);
+}
+
+void vga_graphics_write(char value) {
+  vga_graphics_write_at_offset(value, CURSOR_LOC);
+  CURSOR_LOC += 2;
+}
+
+void vga_graphics_byte_hex(char value) {
+  char low = value & 0x0f;
+  char high = (value & 0xf0) >> 4;
+  vga_graphics_write(HEX_CHARS[high]);
+  vga_graphics_write(HEX_CHARS[low]);
+}
+
+void vga_graphics_write_at_offset(char value, short offset) {
+  __asm__(
+    "mov %0, %%al          \n"
+    "mov %1, %%di          \n"
+    "mov %%al, %%gs:(%%di) \n"
+    : :"r"(value), "r"(offset) : "%ax", "%di");
+}
+
+void vga_graphics_clear() {
+  int TERM_WIDTH = 80;
+  int TERM_HEIGHT = 25;
+
+  int i = 0;
+  while(i < TERM_WIDTH * TERM_HEIGHT) {
+    vga_graphics_write_with_attr(' ', 7);
+    i++;
+  }
+  CURSOR_LOC = 0;
+}
diff --git a/src/output/vga_character.h b/src/output/vga_character.h
new file mode 100644
index 0000000..0d067f3
--- /dev/null
+++ b/src/output/vga_character.h
@@ -0,0 +1,16 @@
+#ifndef vga_character
+#define vga_character
+
+void vga_graphics_write_at_offset(char, short);
+void vga_graphics_write(char);
+void vga_graphics_write_with_attr(char, char);
+void vga_graphics_write_str(char*);
+
+void vga_graphics_byte_hex(char);
+//void vga_graphics_short_hex(short);
+//void vga_graphics_int_hex(int);
+//void vga_graphics_long_hex(long);
+
+void vga_graphics_clear(void);
+
+#endif
-- 
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