127 lines
3.6 KiB
C
127 lines
3.6 KiB
C
#ifndef COLORS_H
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#define COLORS_H
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#include "stdmem.h"
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#include "types.h"
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#include <stdarg.h>
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#include <stddef.h>
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#include <stdint.h>
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#define VGA_WIDTH 80
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#define VGA_HEIGHT 25
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#define VGA_MEMORY_ADDRESS 0xB8000
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/*
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* FOR INPUT
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*/
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#define KEYBOARD_BUFFER_SIZE 256
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#define SCANCODE_LSHIFT 0x2A
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#define SCANCODE_RSHIFT 0x36
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#define SCANCODE_CAPSLOCK 0x3A
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#define RELEASE_MASK 0x80
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static volatile unsigned char _keyboard_buffer[KEYBOARD_BUFFER_SIZE];
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static volatile uint16_t _kb_head = 0;
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static volatile uint16_t _kb_tail = 0;
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static char __g_shift_pressed = 0;
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static char __g_caps_lock_active = 0;
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// C99 Designated Initializers for Unshifted ASCII Characters
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static const char scancode_ascii_unshifted[128] = {
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[0x01] = 27, // ESC
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[0x02] = '1', [0x03] = '2', [0x04] = '3', [0x05] = '4', [0x06] = '5', [0x07] = '6', [0x08] = '7', [0x09] = '8', [0x0A] = '9', [0x0B] = '0', [0x0C] = '-',
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[0x0D] = '=', [0x0E] = '\b', // Backspace
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[0x0F] = '\t', // Tab
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[0x10] = 'q', [0x11] = 'w', [0x12] = 'e', [0x13] = 'r', [0x14] = 't', [0x15] = 'y', [0x16] = 'u', [0x17] = 'i', [0x18] = 'o', [0x19] = 'p', [0x1A] = '[',
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[0x1B] = ']', [0x1C] = '\n', // Enter
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[0x1E] = 'a', [0x1F] = 's', [0x20] = 'd', [0x21] = 'f', [0x22] = 'g', [0x23] = 'h', [0x24] = 'j', [0x25] = 'k', [0x26] = 'l', [0x27] = ';', [0x28] = '\'',
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[0x29] = '`', [0x2C] = 'z', [0x2D] = 'x', [0x2E] = 'c', [0x2F] = 'v', [0x30] = 'b', [0x31] = 'n', [0x32] = 'm', [0x33] = ',', [0x34] = '.', [0x35] = '/',
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[0x39] = ' ' // Spacebar
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};
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// C99 Designated Initializers for Shifted ASCII Characters
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static const char scancode_ascii_shifted[128] = {
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[0x01] = 27, // ESC
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[0x02] = '!', [0x03] = '@', [0x04] = '#', [0x05] = '$', [0x06] = '%', [0x07] = '^', [0x08] = '&', [0x09] = '*', [0x0A] = '(', [0x0B] = ')',
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[0x0C] = '_', [0x0D] = '+', [0x0E] = '\b', [0x0F] = '\t', [0x10] = 'Q', [0x11] = 'W', [0x12] = 'E', [0x13] = 'R', [0x14] = 'T', [0x15] = 'Y',
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[0x16] = 'U', [0x17] = 'I', [0x18] = 'O', [0x19] = 'P', [0x1A] = '{', [0x1B] = '}', [0x1C] = '\n', [0x1E] = 'A', [0x1F] = 'S', [0x20] = 'D',
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[0x21] = 'F', [0x22] = 'G', [0x23] = 'H', [0x24] = 'J', [0x25] = 'K', [0x26] = 'L', [0x27] = ':', [0x28] = '"', [0x29] = '~', [0x2C] = 'Z',
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[0x2D] = 'X', [0x2E] = 'C', [0x2F] = 'V', [0x30] = 'B', [0x31] = 'N', [0x32] = 'M', [0x33] = '<', [0x34] = '>', [0x35] = '?', [0x39] = ' '};
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/* IN VGA - Video Memory Arrya:
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* short
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* 1s byte (left most) -> TEXT COLOR
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* 2s byte -> BACK COLOR
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* 3rd and 4rt byte -> TEXT (unsigned char) AKA CodePoint
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*/
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typedef struct __attribute__((packed)) _VGA {
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unsigned char codepoint; // 3rd and 4th byte
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unsigned char color; // 1st byte: text color, 2nd byte: background color
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// LAST BIT IS BLINKING FLAG
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} _VGA;
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typedef enum _VGA_COLOR {
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BLACK = 0x0,
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BLUE = 0x1,
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GREEN = 0x2,
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CYAN = 0x3,
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RED = 0x4,
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MAGENTA = 0x5,
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BROWN = 0x6,
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LIGHT_GREY = 0x7,
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DARK_GREY = 0x8,
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LIGHT_BLUE = 0x9,
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LIGHT_GREEN = 0xA,
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LIGHT_CYAN = 0xB,
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LIGHT_RED = 0xC,
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LIGHT_MAGENTA = 0xD,
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YELLOW = 0xE,
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WHITE = 0xF
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} _VGA_COLOR;
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typedef struct _VGA_screen_space {
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unsigned int line;
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unsigned int column;
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} _VGA_screen_space;
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static _VGA_screen_space cursor_pos = {0, 0};
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static _VGA_screen_space text_pos = {0, 0};
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static unsigned int tab_pos = 0;
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#define DEFAULT_BG BLUE
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#define DEFAULT_FG WHITE
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/*
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* END OF DECLARATIONS
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*/
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/*
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* START OF OUTPUT FUNCTIONS
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*/
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int printf(const char *fmt, ...);
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void clear_screen();
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/*
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* END OF OUTPUT FUNCTIONS
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*/
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/*
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* START OF INPUT FUNCTIONS
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*/
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void scursor(unsigned int column, unsigned int line);
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void gets(char *buffer, size_t max_length);
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int scanf(const char *fmt, ...);
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#endif
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