Fix tabs and rename it

Author: DamieFC

kernel/arch/i386/text.c

@@ -0,0 +1,86 @@
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+
+#include <kernel/text.h>
+
+#include "vga.h"
+
+static const size_t VGA_WIDTH = 80;
+static const size_t VGA_HEIGHT = 25;
+static uint16_t* const VGA_MEMORY = (uint16_t*) 0xB8000;
+
+static size_t terminal_row;
+static size_t terminal_column;
+static uint8_t terminal_color;
+static uint16_t* terminal_buffer;
+
+void terminal_initialize(void) {
+    terminal_row = 0;
+    terminal_column = 0;
+    terminal_color = vga_entry_color(VGA_COLOR_LIGHT_GREY, VGA_COLOR_BLACK);
+    terminal_buffer = VGA_MEMORY;
+    for (size_t y = 0; y < VGA_HEIGHT; y++) {
+        for (size_t x = 0; x < VGA_WIDTH; x++) {
+            const size_t index = y * VGA_WIDTH + x;
+            terminal_buffer[index] = vga_entry(' ', terminal_color);
+        }
+    }
+}
+
+void terminal_setcolor(uint8_t color) {
+    terminal_color = color;
+}
+
+void terminal_putentryat(unsigned char c, uint8_t color, size_t x, size_t y) {
+    const size_t index = y * VGA_WIDTH + x;
+    terminal_buffer[index] = vga_entry(c, color);
+}
+
+void terminal_scroll(int line) {
+    int loop;
+    char c;
+
+    for(loop = line * (VGA_WIDTH * 2) + 0xB8000; loop < VGA_WIDTH * 2; loop++) {
+        c = *loop;
+        *(loop - (VGA_WIDTH * 2)) = c;
+    }
+}
+
+void terminal_delete_last_line() {
+    int x, *ptr;
+
+    for(x = 0; x < VGA_WIDTH * 2; x++) {
+        ptr = 0xB8000 + (VGA_WIDTH * 2) * (VGA_HEIGHT - 1) + x;
+        *ptr = 0;
+    }
+}
+
+void putchar(char c) {
+    int line;
+    unsigned char uc = c;
+ 
+    terminal_putentryat(uc, terminal_color, terminal_column, terminal_row);
+    if (++terminal_column == VGA_WIDTH) {
+        terminal_column = 0;
+        if (++terminal_row == VGA_HEIGHT)
+        {
+            for(line = 1; line <= VGA_HEIGHT - 1; line++)
+            {
+                terminal_scroll(line);
+            }
+            terminal_delete_last_line();
+            terminal_row = VGA_HEIGHT - 1;
+        }
+    }
+}
+
+void write(const char* data, size_t size) {
+    for (size_t i = 0; i < size; i++)
+        terminal_putchar(data[i]);
+}
+
+void writestring(const char* data) {
+    terminal_write(data, strlen(data));
+}