303 lines
8.0 KiB
C++
303 lines
8.0 KiB
C++
#include <kernel/IO.h>
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#include <kernel/panic.h>
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#include <kernel/Serial.h>
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#include <kernel/tty.h>
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#include <kernel/VESA.h>
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#include <string.h>
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#define BEL 0x07
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#define BS 0x08
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#define HT 0x09
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#define LF 0x0A
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#define FF 0x0C
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#define CR 0x0D
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#define ESC 0x1B
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#define CSI '['
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namespace TTY
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{
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static uint32_t terminal_height = 0;
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static uint32_t terminal_width = 0;
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static uint32_t terminal_row = 0;
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static uint32_t terminal_col = 0;
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static VESA::Color terminal_fg = VESA::Color::BRIGHT_WHITE;
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static VESA::Color terminal_bg = VESA::Color::BLACK;
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static char s_ansi_escape_mode = '\0';
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static int s_ansi_escape_index = 0;
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static int s_ansi_escape_nums[2] = { -1, -1 };
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template<typename T> inline constexpr T max(T a, T b) { return a > b ? a : b; }
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template<typename T> inline constexpr T min(T a, T b) { return a < b ? a : b; }
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template<typename T> inline constexpr T clamp(T x, T a, T b) { return x < a ? a : x > b ? b : x; }
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void initialize()
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{
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terminal_width = VESA::GetTerminalWidth();
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terminal_height = VESA::GetTerminalHeight();
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}
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void clear()
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{
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VESA::Clear(VESA::Color::BLACK);
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}
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void setcolor(VESA::Color fg, VESA::Color bg)
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{
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terminal_fg = fg;
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terminal_bg = bg;
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}
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void clear_line(size_t line)
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{
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for (size_t x = 0; x < terminal_width; x++)
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VESA::PutEntryAt(' ', x, line, terminal_fg, terminal_bg);
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}
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static void update_cursor()
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{
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uint16_t pos = terminal_row * terminal_width + terminal_col;
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IO::outb(0x3D4, 0x0F);
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IO::outb(0x3D5, (uint8_t) (pos & 0xFF));
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IO::outb(0x3D4, 0x0E);
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IO::outb(0x3D5, (uint8_t) ((pos >> 8) & 0xFF));
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}
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void set_cursor_pos(int x, int y)
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{
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terminal_row = y;
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terminal_col = x;
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update_cursor();
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}
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static void reset_ansi_escape()
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{
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s_ansi_escape_mode = '\0';
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s_ansi_escape_index = 0;
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s_ansi_escape_nums[0] = -1;
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s_ansi_escape_nums[1] = -1;
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}
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static void handle_ansi_SGR()
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{
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switch (s_ansi_escape_nums[0])
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{
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case -1:
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case 0:
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terminal_fg = VESA::Color::BRIGHT_WHITE;
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terminal_bg = VESA::Color::BLACK;
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break;
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case 30: terminal_fg = VESA::Color::BRIGHT_BLACK; break;
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case 31: terminal_fg = VESA::Color::BRIGHT_RED; break;
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case 32: terminal_fg = VESA::Color::BRIGHT_GREEN; break;
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case 33: terminal_fg = VESA::Color::BRIGHT_YELLOW; break;
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case 34: terminal_fg = VESA::Color::BRIGHT_BLUE; break;
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case 35: terminal_fg = VESA::Color::BRIGHT_MAGENTA; break;
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case 36: terminal_fg = VESA::Color::BRIGHT_CYAN; break;
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case 37: terminal_fg = VESA::Color::BRIGHT_WHITE; break;
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case 40: terminal_bg = VESA::Color::BRIGHT_BLACK; break;
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case 41: terminal_bg = VESA::Color::BRIGHT_RED; break;
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case 42: terminal_bg = VESA::Color::BRIGHT_GREEN; break;
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case 43: terminal_bg = VESA::Color::BRIGHT_YELLOW; break;
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case 44: terminal_bg = VESA::Color::BRIGHT_BLUE; break;
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case 45: terminal_bg = VESA::Color::BRIGHT_MAGENTA; break;
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case 46: terminal_bg = VESA::Color::BRIGHT_CYAN; break;
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case 47: terminal_bg = VESA::Color::BRIGHT_WHITE; break;
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}
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}
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static void handle_ansi_escape(char c)
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{
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switch (s_ansi_escape_mode)
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{
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case '\1':
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{
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if (c == CSI)
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{
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s_ansi_escape_mode = CSI;
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return;
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}
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return reset_ansi_escape();
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}
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case CSI:
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{
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switch (c)
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{
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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{
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int& val = s_ansi_escape_nums[s_ansi_escape_index];
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val = (val == -1) ? (c - '0') : (val * 10 + c - '0');
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return;
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}
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case ';':
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s_ansi_escape_index++;
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return;
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case 'A': // Cursor Up
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if (s_ansi_escape_nums[0] == -1)
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s_ansi_escape_nums[0] = 1;
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terminal_row = max<int32_t>(terminal_row - s_ansi_escape_nums[0], 0);
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return reset_ansi_escape();
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case 'B': // Curson Down
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if (s_ansi_escape_nums[0] == -1)
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s_ansi_escape_nums[0] = 1;
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terminal_row = min<int32_t>(terminal_row + s_ansi_escape_nums[0], terminal_height - 1);
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return reset_ansi_escape();
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case 'C': // Cursor Forward
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if (s_ansi_escape_nums[0] == -1)
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s_ansi_escape_nums[0] = 1;
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terminal_col = min<int32_t>(terminal_col + s_ansi_escape_nums[0], terminal_width - 1);
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return reset_ansi_escape();
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case 'D': // Cursor Back
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if (s_ansi_escape_nums[0] == -1)
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s_ansi_escape_nums[0] = 1;
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terminal_col = max<int32_t>(terminal_col - s_ansi_escape_nums[0], 0);
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return reset_ansi_escape();
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case 'E': // Cursor Next Line
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if (s_ansi_escape_nums[0] == -1)
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s_ansi_escape_nums[0] = 1;
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terminal_row = min<int32_t>(terminal_row + s_ansi_escape_nums[0], terminal_height - 1);
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terminal_col = 0;
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return reset_ansi_escape();
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case 'F': // Cursor Previous Line
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if (s_ansi_escape_nums[0] == -1)
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s_ansi_escape_nums[0] = 1;
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terminal_row = max<int32_t>(terminal_row - s_ansi_escape_nums[0], 0);
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terminal_col = 0;
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return reset_ansi_escape();
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case 'G': // Cursor Horizontal Absolute
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if (s_ansi_escape_nums[0] == -1)
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s_ansi_escape_nums[0] = 1;
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terminal_col = clamp<int32_t>(s_ansi_escape_nums[0] - 1, 0, terminal_width - 1);
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return reset_ansi_escape();
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case 'H': // Cursor Position
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if (s_ansi_escape_nums[0] == -1)
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s_ansi_escape_nums[0] = 1;
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if (s_ansi_escape_nums[1] == -1)
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s_ansi_escape_nums[1] = 1;
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terminal_row = clamp<int32_t>(s_ansi_escape_nums[0] - 1, 0, terminal_height - 1);
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terminal_col = clamp<int32_t>(s_ansi_escape_nums[1] - 1, 0, terminal_width - 1);
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return reset_ansi_escape();
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case 'J': // Erase in Display
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dprintln("Unsupported ANSI CSI character J");
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return reset_ansi_escape();
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case 'K': // Erase in Line
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switch (s_ansi_escape_nums[0])
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{
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case -1: case 0:
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for (size_t i = terminal_col; i < terminal_width; i++)
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VESA::PutEntryAt(' ', i, terminal_row, terminal_fg, terminal_bg);
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break;
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case 1:
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for (size_t i = 0; i <= terminal_col; i++)
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VESA::PutEntryAt(' ', i, terminal_row, terminal_fg, terminal_bg);
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break;
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case 2:
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for (size_t i = 0; i < terminal_width; i++)
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VESA::PutEntryAt(' ', i, terminal_row, terminal_fg, terminal_bg);
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break;
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}
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return reset_ansi_escape();
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case 'S': // Scroll Up
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dprintln("Unsupported ANSI CSI character S");
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return reset_ansi_escape();
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case 'T': // Scroll Down
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dprintln("Unsupported ANSI CSI character T");
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return reset_ansi_escape();
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case 'f': // Horizontal Vertical Position
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dprintln("Unsupported ANSI CSI character f");
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return reset_ansi_escape();
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case 'm':
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handle_ansi_SGR();
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return reset_ansi_escape();
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default:
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dprintln("Unsupported ANSI CSI character {}", c);
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return reset_ansi_escape();
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}
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}
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default:
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dprintln("Unsupported ANSI mode");
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return reset_ansi_escape();
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}
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}
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void putchar(char c)
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{
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if (s_ansi_escape_mode)
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return handle_ansi_escape(c);
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// https://en.wikipedia.org/wiki/ANSI_escape_code
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switch (c)
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{
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case BEL: // TODO
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break;
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case BS:
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if (terminal_col > 0)
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terminal_col--;
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break;
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case HT:
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terminal_col++;
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while (terminal_col % 8)
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terminal_col++;
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break;
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case LF:
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terminal_col = 0;
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terminal_row++;
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break;
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case FF:
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terminal_row++;
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break;
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case CR:
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terminal_col = 0;
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break;
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case ESC:
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s_ansi_escape_mode = '\1';
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break;
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default:
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VESA::PutEntryAt(c, terminal_col, terminal_row, terminal_fg, terminal_bg);
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terminal_col++;
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break;
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}
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if (terminal_col >= terminal_width)
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{
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terminal_col = 0;
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terminal_row++;
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}
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while (terminal_row >= terminal_height)
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{
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for (size_t line = 1; line < terminal_height; line++)
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VESA::ScrollLine(line);
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clear_line(terminal_height - 1);
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terminal_col = 0;
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terminal_row--;
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}
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update_cursor();
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}
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void write(const char* data, size_t size)
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{
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for (size_t i = 0; i < size; i++)
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putchar(data[i]);
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}
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void writestring(const char* data)
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{
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while (*data)
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{
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putchar(*data);
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data++;
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}
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}
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} |