Files
SoraOS/stdio.h
T

463 lines
9.9 KiB
C

#ifndef COLORS_H
#define COLORS_H
#include "types.h"
#include <stdarg.h>
#include <stddef.h>
#define VGA_WIDTH 80
#define VGA_HEIGHT 25
#define VGA_MEMORY_ADDRESS 0xB8000
/*
* FOR INPUT
*/
#define KEYBOARD_BUFFER_SIZE 256
static char _keyboard_buffer[KEYBOARD_BUFFER_SIZE];
static uint16_t _kb_head = 0;
static uint16_t _kb_tail = 0;
/* IN VGA - Video Memory Arrya:
* short
* 1s byte (left most) -> TEXT COLOR
* 2s byte -> BACK COLOR
* 3rd and 4rt byte -> TEXT (unsigned char) AKA CodePoint
*/
typedef struct __attribute__((packed)) _VGA {
unsigned char codepoint; // 3rd and 4th byte
unsigned char color; // 1st byte: text color, 2nd byte: background color
// LAST BIT IS BLINKING FLAG
} _VGA;
typedef enum _VGA_COLOR {
BLACK = 0x0,
BLUE = 0x1,
GREEN = 0x2,
CYAN = 0x3,
RED = 0x4,
MAGENTA = 0x5,
BROWN = 0x6,
LIGHT_GREY = 0x7,
DARK_GREY = 0x8,
LIGHT_BLUE = 0x9,
LIGHT_GREEN = 0xA,
LIGHT_CYAN = 0xB,
LIGHT_RED = 0xC,
LIGHT_MAGENTA = 0xD,
YELLOW = 0xE,
WHITE = 0xF
} _VGA_COLOR;
typedef struct _VGA_screen_space {
unsigned int line;
unsigned int column;
} _VGA_screen_space;
static _VGA_screen_space cursor_pos = {0, 0};
static _VGA_screen_space text_pos = {0, 0};
static unsigned int tab_pos = 0;
#define DEFAULT_BG BLUE
#define DEFAULT_FG WHITE
/*
* END OF DECLARATIONS
*/
/*
* START OF OUTPUT FUNCTIONS
*/
int printf(const char *fmt, ...);
// Convert _VGA_COLOR to color byte
static inline unsigned char __vga_color_byte(_VGA_COLOR fg, _VGA_COLOR bg, int blink) {
unsigned char color = (bg << 4) | fg;
if (blink) {
color |= 0x80; // Set the blinking BIT
// to the highest bit
}
return color;
}
// Get pointer to VGA memory
static inline volatile _VGA *__vga_memory() {
return (volatile _VGA *)VGA_MEMORY_ADDRESS;
}
static inline void __clear_screen() {
volatile _VGA *vga = __vga_memory();
for (int i = 0; i < VGA_WIDTH * VGA_HEIGHT; i++) {
vga[i].codepoint = ' ';
vga[i].color = __vga_color_byte(DEFAULT_FG, DEFAULT_BG, 0);
}
}
static inline void __clear_screen_colored(_VGA_COLOR background) {
volatile _VGA *vga = __vga_memory();
for (int i = 0; i < VGA_WIDTH * VGA_HEIGHT; i++) {
vga[i].codepoint = ' ';
vga[i].color = __vga_color_byte(WHITE, background, 0);
}
}
static inline int __put_char_VGA_POS(_VGA _c, _VGA_screen_space _position, int _blink) {
if (_position.line > VGA_HEIGHT || _position.column > VGA_WIDTH)
return 0;
volatile _VGA *vga = __vga_memory();
if (_c.codepoint == '\n') {
text_pos.line++;
text_pos.column = 0;
return 1;
}
if (_c.codepoint == '\t') {
int spaces = 4 - (_position.column % 4);
if (spaces == 0)
spaces = 4;
int written = 0;
while (spaces--) {
if (_position.column >= VGA_WIDTH) {
_position.column = 0;
_position.line++;
if (_position.line >= VGA_HEIGHT) {
// TODO: scroll or wrap
break;
}
}
vga[(_position.line * VGA_WIDTH) + _position.column].codepoint = ' ';
vga[(_position.line * VGA_WIDTH) + _position.column].color = _c.color;
_position.column++;
written++;
}
text_pos.line = _position.line;
text_pos.column = _position.column;
return written;
}
vga[(_position.line * VGA_WIDTH) + _position.column].codepoint = _c.codepoint;
vga[(_position.line * VGA_WIDTH) + _position.column].color = _c.color;
return 1;
}
static inline int __put_char(int column, int line, unsigned codepoint, _VGA_COLOR foreground, _VGA_COLOR background, int _blink) {
_VGA __temp_vga;
__temp_vga.color = __vga_color_byte(foreground, background, _blink);
__temp_vga.codepoint = codepoint;
_VGA_screen_space __temp_vga_space;
__temp_vga_space.column = column;
__temp_vga_space.line = line;
return __put_char_VGA_POS(__temp_vga, __temp_vga_space, _blink);
}
static inline int __put_string(int column, int line, const char *__args, _VGA_COLOR foreground, _VGA_COLOR background, int _blink) {
unsigned long _counter = 0;
while (*__args != '\0') {
if (column >= VGA_WIDTH) {
column = 0;
line++;
if (line >= VGA_HEIGHT) {
// TODO: SCROLL OR LOOP...
}
}
_counter += __put_char(column++, line, *__args++, foreground, background, _blink);
}
return _counter;
}
static inline int __print_string(const char *__args, _VGA_COLOR foreground, _VGA_COLOR background, int _blink) {
unsigned long _counter = 0;
while (*__args != '\0') {
if (text_pos.column >= VGA_WIDTH) {
text_pos.column = 0;
text_pos.line++;
if (text_pos.line >= VGA_HEIGHT) {
// TODO: SCROLL OR LOOP...
}
}
_counter += __put_char(text_pos.column++, text_pos.line, *__args++, foreground, background, _blink);
}
return _counter;
}
// TODO: Implement later on the (argc, ...) to allow for stuff like printf("%d", number);
static inline int printf_s(const char *args) {
// by defeault we dont blink lol
return __print_string(args, DEFAULT_FG, DEFAULT_BG, 0);
}
static int __printf_internal(const char *fmt, va_list args) {
int count = 0;
while (*fmt) {
if (*fmt != '%') {
__put_char(text_pos.column++, text_pos.line, *fmt++, DEFAULT_FG, DEFAULT_BG, 0);
count++;
continue;
}
fmt++; // skip %
switch (*fmt) {
case 'c': {
char c = (char)va_arg(args, int);
__put_char(text_pos.column++, text_pos.line, c, DEFAULT_FG, DEFAULT_BG, 0);
count++;
break;
}
case 's': {
const char *s = va_arg(args, const char *);
count += __print_string(s, DEFAULT_FG, DEFAULT_BG, 0);
break;
}
case 'd': {
int n = va_arg(args, int);
char buf[32];
count += __print_string(itoa(n, buf), DEFAULT_FG, DEFAULT_BG, 0);
break;
}
case 'u': {
unsigned n = va_arg(args, unsigned);
char buf[32];
count += __print_string(utoa(n, buf), DEFAULT_FG, DEFAULT_BG, 0);
break;
}
case 'o': {
unsigned n = va_arg(args, unsigned);
char buf[32];
count += __print_string(otoa(n, buf), DEFAULT_FG, DEFAULT_BG, 0);
break;
}
case 'x': {
unsigned n = va_arg(args, unsigned);
char buf[32];
count += __print_string(__utoa(n, buf, 16), DEFAULT_FG, DEFAULT_BG, 0);
break;
}
/*
* TODO: Enable floating point support later
* This requires enabling FPU in the kernel
case 'f': {
double f = va_arg(args, double);
char buf[64];
count += __print_string(ftoa(f, buf), DEFAULT_FG, DEFAULT_BG, 0);
break;
}
*/
case '%': {
__put_char(text_pos.column++, text_pos.line, '%', DEFAULT_FG, DEFAULT_BG, 0);
count++;
break;
}
default:
__put_char(text_pos.column++, text_pos.line, *fmt, DEFAULT_FG, DEFAULT_BG, 0);
count++;
break;
}
fmt++;
}
return count;
}
int printf(const char *fmt, ...) {
va_list args;
va_start(args, fmt);
int result = __printf_internal(fmt, args);
va_end(args);
return result;
}
/*
* END OF OUTPUT FUNCTIONS
*/
/*
* START OF INPUT FUNCTIONS
*/
static inline void outb(unsigned short port, unsigned char val) {
__asm__ volatile ("outb %0, %1" : : "a"(val), "Nd"(port));
}
static inline void __VGA_set_cursor_internal(unsigned int column, unsigned int line) {
if (column >= VGA_WIDTH) column = VGA_WIDTH - 1;
if (line >= VGA_HEIGHT) line = VGA_HEIGHT - 1;
unsigned short pos = line * VGA_WIDTH + column;
// Send high byte
outb(0x3D4, 0x0E);
outb(0x3D5, (pos >> 8) & 0xFF);
// Send low byte
outb(0x3D4, 0x0F);
outb(0x3D5, pos & 0xFF);
cursor_pos.column = column;
cursor_pos.line = line;
text_pos.column = column;
text_pos.line = line;
}
static void __VGA_set_cursor_VGA_pos(_VGA_screen_space pos) {
__VGA_set_cursor_internal(pos.column, pos.line);
}
static _VGA_screen_space get_cursor_pos() {
_VGA_screen_space __temp = {cursor_pos.column, cursor_pos.line};
return __temp;
}
void scursor(unsigned int column, unsigned int line) {
__VGA_set_cursor_internal(column, line);
}
static inline void __keyboard_buffer_push(char __c) {
_keyboard_buffer[_kb_head] = __c;
_kb_head = (_kb_head + 1) % KEYBOARD_BUFFER_SIZE;
}
static inline char __keyboard_buffer_pop() {
if (_kb_tail == _kb_head) {
return '\0';
}
char __c = _keyboard_buffer[_kb_tail];
_kb_tail = (_kb_tail + 1) % KEYBOARD_BUFFER_SIZE;
return __c;
}
static inline char __gets_internal(char *buffer, size_t max_length) {
size_t index = 0;
char __c;
while (index < max_length - 1) {
__c = __keyboard_buffer_pop();
if (__c == '\0') {
continue;
}
if (__c == '\n' || __c == '\r') {
buffer[index] = '\0';
break;
}
buffer[index++] = __c;
}
buffer[index] = '\0';
return index;
}
void gets(char *buffer, size_t max_length) {
__gets_internal(buffer, max_length);
}
static inline int __scanf_internal(const char *fmt, va_list args) {
char buffer[256];
__gets_internal(buffer, sizeof(buffer));
const char* p = fmt;
char* in = buffer;
int count = 0;
while (*p) {
if (*p == '%') {
p++;
if (*p == 'd') {
int* out = va_arg(args, int*);
int sign = 1;
int value = 0;
if (*in == '-') { sign = -1; in++; }
while (*in >= '0' && *in <= '9') {
value = value * 10 + (*in - '0');
in++;
}
*out = value * sign;
count++;
}
else if (*p == 's') {
char* out = va_arg(args, char*);
while (*in == ' ') in++; // skip spaces
while (*in && *in != ' ') {
*out++ = *in++;
}
*out = '\0';
count++;
}
else if (*p == 'c') {
char* out = va_arg(args, char*);
*out = *in++;
count++;
}
}
p++;
}
va_end(args);
return count;
}
int scanf(const char *fmt, ...) {
va_list args;
va_start(args, fmt);
int result = __scanf_internal(fmt, args);
va_end(args);
return result;
}
#endif