Merge pull request #3 from VinceAle7082/Coding

Coding is now the "main branch"

.gitignore

@@ -1,2 +1,3 @@
 build/
 .mailmap
+.vscode

README.md

@@ -1,3 +1,6 @@
+<h2>This is the "Coding" branch, the code in this branch is full of bugs and errors or simply doesn't compile, please use the main branch!</h2>
+<hr>
+
 Hey all, Vincenzo Aleskey Brocato (VinceAle7082) here! <br>
 This is a little project where I try to make an OS just for fun <br>
 <br>

src/bootloader/stage2/main.c

@@ -1,7 +1,7 @@
 #include "stdint.h"
 #include "stdio.h"
 
-void _cdecl  cstart_(uint16_t bootDrive)
+void _cdecl cstart_(uint16_t bootDrive)
 {
     puts("Hello World from the Stage 2 of the bootloader written in C!");
     for (;;);

src/bootloader/stage2/main.err

@@ -1,3 +0,0 @@
-stdio.h(4): Warning! W138: No newline at end of file
-main.c(8): Warning! W138: No newline at end of file
-main.c(4): Warning! W303: Parameter 'bootDrive' has been defined, but not referenced

src/bootloader/stage2/stdint.h

@@ -8,5 +8,7 @@ typedef signed long int int32_t;
 typedef unsigned long int uint32_t;
 typedef signed long int int64_t;
 typedef unsigned long int uint64_t;
+typedef uint8_t bool;
 
-
+#define true 1
+#define false 0

src/bootloader/stage2/stdio.c

@@ -13,3 +13,154 @@ void puts(const char *str)
         str++;
     }
 }
+
+#define PRINTF_STATE_NORMAL         0
+#define PRINTF_STATE_LENGHT         1
+#define PRINTF_STATE_LENGHT_SHORT   2
+#define PRINTF_STATE_LENGHT_LONG    1
+#define PRINTF_STATE_SPEC           4
+#define PRINTF_LENGTH_DEFAULT       0
+#define PRINTF_LENGTH_SHORT_SHORT   1
+#define PRINTF_LENGTH_SHORT         2
+#define PRINTF_LENGTH_LONG          3
+#define PRINTF_LENGTH_LONG_LONG     4
+int* printf_number(int *argp, int length, bool sign, int radix)
+const char g_HexChars[] = '0123456789abcdef'
+
+void _cdecl printf(const char *fmt, ...)
+{
+    int *argp = (int*)&fmt;
+    int state = PRINTF_STATE_NORMAL;
+    int length = PRINTF_LENGTH_DEFAULT;
+    int radix = 10;
+    bool sign = false;
+    argp++;
+    while (*fmt)
+    {
+        switch (state)
+        {
+        case PRINTF_STATE_NORMAL:
+            switch (*fmt)
+            {
+            case '%':
+                state = PRINTF_STATE_LENGHT;
+                break;
+            default:
+                putc(*fmt);
+                break;
+            }
+        
+        case PRINTF_STATE_LENGHT:
+            switch (*fmt)
+            {
+            case 'h':
+                length = PRINTF_LENGTH_SHORT;
+                state = PRINTF_STATE_LENGHT_SHORT;
+                break;
+            case 'l': 
+                length = PRINTF_LENGTH_LONG;
+                state = PRINTF_STATE_LENGHT_LONG;
+                break;
+
+            default:
+                goto PRINTF_STATE_SPEC;
+            }
+            break;
+
+        case PRINTF_LENGTH_SHORT:
+            if (*fmt == 'h')
+            {
+                length = PRINTF_LENGTH_SHORT_SHORT;
+                state = PRINTF_STATE_SPEC;
+            }
+            else
+            {
+                goto PRINTF_STATE_SPEC;
+            }
+            break;
+        
+        case PRINTF_STATE_SPEC:
+            switch (*fmt)
+            {
+                case 'c':
+                    putc((char)*argp);
+                    argp++;
+                    break;
+                case 's': 
+                    puts(*(char **)argp);
+                    argp++;
+                    break;
+                case '%':
+                    putc('%');
+                    break;
+                case 'd': 
+                case 'i': 
+                    radix = 10;
+                    sign = true;
+                    argp = printf_number(argp, length, sign, radix);
+                    break;
+                case 'u':  
+                    radix = 10;
+                    sign = false;
+                    argp = printf_number(argp, length, sign, radix);
+                    break;
+                case 'x':
+                case 'X':
+                case 'p':
+                    radix = 16;
+                    sign = false;
+                    argp = printf_number(argp, length, sign, radix);
+                    break;
+                case 'o':
+                    radix = 8;
+                    sign = false;
+                    argp = printf_number(argp, length, sign, radix);
+                    break;
+                //Se è messo un carattere non valido questo codice fa in modo che li ignora.
+                default:
+                    break;
+            }
+            //Porta le variabili allo stato di default / normale.
+            state = PRINTF_STATE_NORMAL;
+            length = PRINTF_LENGTH_DEFAULT;
+            radix = 10;
+            sign = false;
+            break;
+        }
+        fmt++;
+    }
+}
+
+int* printf_number(int* argp, int length, bool sign, int radix)
+{
+    char buffer[32];
+    unsigned long long number;
+    int number_sign = 1;
+    int pos = 0;
+
+    switch (length)
+    {
+        case PRINTF_LENGTH_SHORT_SHORT:
+        case PRINTF_LENGTH_SHORT:
+        case PRINTF_LENGTH_LONG:
+        case PRINTF_LENGTH_LONG_LONG:
+        case PRINTF_LENGTH_DEFAULT:
+            if (sign)
+            {
+                int n = *argp;
+                if (n < 0)
+                {
+                    n = -n;
+                    number_sign = -1;
+                }
+                number = n;
+            }
+            else
+            {
+                number = (*unsigned int*)argp;
+
+            }
+            argp++;
+            break;
+        }
+}

src/bootloader/stage2/stdio.err

@@ -1,2 +0,0 @@
-stdio.h(4): Warning! W138: No newline at end of file
-x86.h(4): Warning! W138: No newline at end of file

src/bootloader/stage2/stdio.h

@@ -1,4 +1,5 @@
 #pragma once
 
 void putc(char c);
-void puts(const char *str);
+void puts(const char* str);
+void _cdecl printf(const char *fmt, ...);