feat(main file refactorized)

.gitignore

+.DS_Store

src/utils.c

+#include "ioport.h"
+#include "gdt.h"
+
+#include "utils.h"
+
+/* print a char on the screen */
+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 assert0(char b, const char *filename, const char *fct_name, const int line)
+{
+    if (!b)
+    {
+        puts("Assertion error in ");
+        puts(filename);
+        puts(" in ");
+        puts(fct_name);
+        puts(" at 0x");
+        puthex(line);
+        puts("\n");
+    }
+}
+
+void irq_disable()
+{
+    __asm volatile("cli");
+}
+
+void irq_enable()
+{
+    __asm volatile("sti");
+    _outb(0xA0, 0x20);
+    _outb(0x20, 0x20);
+}
+
+/* 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()
+{
+    int i;
+    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(const char *aString)
+{
+    const char *current_char = aString;
+    while (*current_char != 0)
+    {
+        putc(*current_char++);
+    }
+}
+
+/* print an number in hexa */
+char *hex_digit = "0123456789ABCDEF";
+void puthex(int aNumber)
+{
+    int i;
+    int started = 0;
+    for (i = 28; i >= 0; i -= 4)
+    {
+        int k = (aNumber >> i) & 0xF;
+        if (k != 0 || started)
+        {
+            putc(hex_digit[k]);
+            started = 1;
+        }
+    }
+}
+
+void setCursor()
+{
+    int cursor_offset = cursor_x + cursor_y * 80;
+    _outb(0x3d4, 14);
+    _outb(0x3d5, ((cursor_offset >> 8) & 0xFF));
+    _outb(0x3d4, 15);
+    _outb(0x3d5, (cursor_offset & 0xFF));
+}
+
+void putc(char c)
+{
+    if (cursor_x > 79)
+    {
+        cursor_x = 0;
+        cursor_y++;
+    }
+    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 */
+               /* or print a simple character */
+    default:
+        video_memory[(cursor_x + 80 * cursor_y) * 2] = c;
+        cursor_x++;
+        break;
+    }
+    setCursor();
+}
\ No newline at end of file