banan-os/kernel/kernel/TTY.cpp

393 lines
9.7 KiB
C++

#include <BAN/Errors.h>
#include <BAN/ScopeGuard.h>
#include <kernel/Debug.h>
#include <kernel/LockGuard.h>
#include <kernel/TTY.h>
#include <string.h>
#define BEL 0x07
#define BS 0x08
#define HT 0x09
#define LF 0x0A
#define FF 0x0C
#define CR 0x0D
#define ESC 0x1B
#define CSI '['
template<typename T> inline constexpr T max(T a, T b) { return a > b ? a : b; }
template<typename T> inline constexpr T min(T a, T b) { return a < b ? a : b; }
template<typename T> inline constexpr T clamp(T x, T a, T b) { return x < a ? a : x > b ? b : x; }
static TTY* s_tty = nullptr;
TTY::TTY(TerminalDriver* driver)
: m_terminal_driver(driver)
{
m_width = m_terminal_driver->width();
m_height = m_terminal_driver->height();
m_buffer = new Cell[m_width * m_height];
if (s_tty == nullptr)
s_tty = this;
}
void TTY::clear()
{
for (uint32_t i = 0; i < m_width * m_height; i++)
m_buffer[i] = { .foreground = m_foreground, .background = m_background, .character = ' ' };
m_terminal_driver->clear(m_background);
}
void TTY::set_cursor_position(uint32_t x, uint32_t y)
{
static uint32_t last_x = -1;
static uint32_t last_y = -1;
if (last_x != uint32_t(-1) && last_y != uint32_t(-1))
render_from_buffer(last_x, last_y); // Hacky way to clear previous cursor in graphics mode :D
m_terminal_driver->set_cursor_position(x, y);
last_x = m_column = x;
last_y = m_row = y;
}
void TTY::set_font(const Kernel::Font& font)
{
m_terminal_driver->set_font(font);
uint32_t new_width = m_terminal_driver->width();
uint32_t new_height = m_terminal_driver->height();
if (m_width != new_width || m_height != new_height)
{
Cell* new_buffer = new Cell[new_width * new_height];
ASSERT(new_buffer);
for (uint32_t i = 0; i < new_width * m_height; i++)
new_buffer[i] = { .foreground = m_foreground, .background = m_background, .character = ' ' };
for (uint32_t y = 0; y < BAN::Math::min<uint32_t>(m_height, new_height); y++)
for (uint32_t x = 0; x < BAN::Math::min<uint32_t>(m_width, new_width); x++)
new_buffer[y * new_width + x] = m_buffer[y * m_width + x];
delete[] m_buffer;
m_buffer = new_buffer;
m_width = new_width;
m_height = new_height;
}
for (uint32_t y = 0; y < m_height; y++)
for (uint32_t x = 0; x < m_width; x++)
render_from_buffer(x, y);
}
static uint16_t handle_unicode(uint8_t ch)
{
static uint8_t unicode_left = 0;
static uint16_t codepoint = 0;
if (unicode_left)
{
if ((ch >> 6) == 0b10)
{
codepoint = (codepoint << 6) | ch;
unicode_left--;
if (unicode_left > 0)
return 0xFFFF;
return codepoint;
}
else
{
// invalid utf-8
unicode_left = 0;
return 0x00;
}
}
else
{
if ((ch >> 3) == 0b11110)
{
unicode_left = 3;
codepoint = ch & 0b00000111;
return 0xFFFF;
}
if ((ch >> 4) == 0b1110)
{
unicode_left = 2;
codepoint = ch & 0b00001111;
return 0xFFFF;
}
if ((ch >> 5) == 0b110)
{
unicode_left = 1;
codepoint = ch & 0b00011111;
return 0xFFFF;
}
}
return ch & 0x7F;
}
void TTY::reset_ansi_escape()
{
m_ansi_state.mode = '\0';
m_ansi_state.index = 0;
m_ansi_state.nums[0] = -1;
m_ansi_state.nums[1] = -1;
}
void TTY::handle_ansi_sgr()
{
switch (m_ansi_state.nums[0])
{
case -1:
case 0:
m_foreground = TerminalColor::BRIGHT_WHITE;
m_background = TerminalColor::BLACK;
break;
case 30: m_foreground = TerminalColor::BRIGHT_BLACK; break;
case 31: m_foreground = TerminalColor::BRIGHT_RED; break;
case 32: m_foreground = TerminalColor::BRIGHT_GREEN; break;
case 33: m_foreground = TerminalColor::BRIGHT_YELLOW; break;
case 34: m_foreground = TerminalColor::BRIGHT_BLUE; break;
case 35: m_foreground = TerminalColor::BRIGHT_MAGENTA; break;
case 36: m_foreground = TerminalColor::BRIGHT_CYAN; break;
case 37: m_foreground = TerminalColor::BRIGHT_WHITE; break;
case 40: m_background = TerminalColor::BRIGHT_BLACK; break;
case 41: m_background = TerminalColor::BRIGHT_RED; break;
case 42: m_background = TerminalColor::BRIGHT_GREEN; break;
case 43: m_background = TerminalColor::BRIGHT_YELLOW; break;
case 44: m_background = TerminalColor::BRIGHT_BLUE; break;
case 45: m_background = TerminalColor::BRIGHT_MAGENTA; break;
case 46: m_background = TerminalColor::BRIGHT_CYAN; break;
case 47: m_background = TerminalColor::BRIGHT_WHITE; break;
}
}
void TTY::handle_ansi_escape(uint16_t ch)
{
switch (m_ansi_state.mode)
{
case '\1':
{
if (ch == CSI)
{
m_ansi_state.mode = CSI;
return;
}
return reset_ansi_escape();
}
case CSI:
{
switch (ch)
{
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
{
int32_t& val = m_ansi_state.nums[m_ansi_state.index];
val = (val == -1) ? (ch - '0') : (val * 10 + ch - '0');
return;
}
case ';':
m_ansi_state.index++;
return;
case 'A': // Cursor Up
if (m_ansi_state.nums[0] == -1)
m_ansi_state.nums[0] = 1;
m_row = max<int32_t>(m_row - m_ansi_state.nums[0], 0);
return reset_ansi_escape();
case 'B': // Curson Down
if (m_ansi_state.nums[0] == -1)
m_ansi_state.nums[0] = 1;
m_row = min<int32_t>(m_row + m_ansi_state.nums[0], m_height - 1);
return reset_ansi_escape();
case 'C': // Cursor Forward
if (m_ansi_state.nums[0] == -1)
m_ansi_state.nums[0] = 1;
m_column = min<int32_t>(m_column + m_ansi_state.nums[0], m_width - 1);
return reset_ansi_escape();
case 'D': // Cursor Back
if (m_ansi_state.nums[0] == -1)
m_ansi_state.nums[0] = 1;
m_column = max<int32_t>(m_column - m_ansi_state.nums[0], 0);
return reset_ansi_escape();
case 'E': // Cursor Next Line
if (m_ansi_state.nums[0] == -1)
m_ansi_state.nums[0] = 1;
m_row = min<int32_t>(m_row + m_ansi_state.nums[0], m_height - 1);
m_column = 0;
return reset_ansi_escape();
case 'F': // Cursor Previous Line
if (m_ansi_state.nums[0] == -1)
m_ansi_state.nums[0] = 1;
m_row = max<int32_t>(m_row - m_ansi_state.nums[0], 0);
m_column = 0;
return reset_ansi_escape();
case 'G': // Cursor Horizontal Absolute
if (m_ansi_state.nums[0] == -1)
m_ansi_state.nums[0] = 1;
m_column = clamp<int32_t>(m_ansi_state.nums[0] - 1, 0, m_width - 1);
return reset_ansi_escape();
case 'H': // Cursor Position
if (m_ansi_state.nums[0] == -1)
m_ansi_state.nums[0] = 1;
if (m_ansi_state.nums[1] == -1)
m_ansi_state.nums[1] = 1;
m_row = clamp<int32_t>(m_ansi_state.nums[0] - 1, 0, m_height - 1);
m_column = clamp<int32_t>(m_ansi_state.nums[1] - 1, 0, m_width - 1);
return reset_ansi_escape();
case 'J': // Erase in Display
dprintln("Unsupported ANSI CSI character J");
return reset_ansi_escape();
case 'K': // Erase in Line
if (m_ansi_state.nums[0] == -1 || m_ansi_state.nums[0] == 0)
for (uint32_t i = m_column; i < m_width; i++)
putchar_at(' ', i, m_row);
else
dprintln("Unsupported ANSI CSI character K");
return reset_ansi_escape();
case 'S': // Scroll Up
dprintln("Unsupported ANSI CSI character S");
return reset_ansi_escape();
case 'T': // Scroll Down
dprintln("Unsupported ANSI CSI character T");
return reset_ansi_escape();
case 'f': // Horizontal Vertical Position
dprintln("Unsupported ANSI CSI character f");
return reset_ansi_escape();
case 'm':
handle_ansi_sgr();
return reset_ansi_escape();
default:
dprintln("Unsupported ANSI CSI character {}", ch);
return reset_ansi_escape();
}
}
default:
dprintln("Unsupported ANSI mode");
return reset_ansi_escape();
}
}
void TTY::render_from_buffer(uint32_t x, uint32_t y)
{
ASSERT(x < m_width && y < m_height);
const auto& cell = m_buffer[y * m_width + x];
m_terminal_driver->putchar_at(cell.character, x, y, cell.foreground, cell.background);
}
void TTY::putchar_at(uint16_t ch, uint32_t x, uint32_t y)
{
ASSERT(x < m_width && y < m_height);
auto& cell = m_buffer[y * m_width + x];
cell.character = ch;
cell.foreground = m_foreground;
cell.background = m_background;
m_terminal_driver->putchar_at(ch, x, y, m_foreground, m_background);
}
void TTY::putchar(char ch)
{
Kernel::LockGuard guard(m_lock);
uint16_t cp = handle_unicode(ch);
if (cp == 0xFFFF)
return;
if (m_ansi_state.mode != 0)
{
handle_ansi_escape(cp);
set_cursor_position(m_column, m_row);
return;
}
// https://en.wikipedia.org/wiki/ANSI_escape_code
switch (cp)
{
case BEL: // TODO
break;
case BS:
if (m_column > 0)
m_column--;
break;
case HT:
m_column++;
while (m_column % 8)
m_column++;
break;
case LF:
m_column = 0;
m_row++;
break;
case FF:
m_row++;
break;
case CR:
m_column = 0;
break;
case ESC:
m_ansi_state.mode = '\1';
break;
default:
putchar_at(cp, m_column, m_row);
m_column++;
break;
}
if (m_column >= m_width)
{
m_column = 0;
m_row++;
}
while (m_row >= m_height)
{
memmove(m_buffer, m_buffer + m_width, m_width * (m_height - 1) * sizeof(Cell));
// Clear last line in buffer
for (uint32_t x = 0; x < m_width; x++)
m_buffer[(m_height - 1) * m_width + x] = { .foreground = m_foreground, .background = m_background, .character = ' ' };
// Render the whole buffer to the screen
for (uint32_t y = 0; y < m_height; y++)
for (uint32_t x = 0; x < m_width; x++)
render_from_buffer(x, y);
m_column = 0;
m_row--;
}
set_cursor_position(m_column, m_row);
}
void TTY::write(const char* data, size_t size)
{
for (size_t i = 0; i < size; i++)
putchar(data[i]);
}
void TTY::write_string(const char* data)
{
while (*data)
{
putchar(*data);
data++;
}
}
void TTY::putchar_current(char ch)
{
ASSERT(s_tty);
s_tty->putchar(ch);
}
bool TTY::is_initialized()
{
return s_tty != nullptr;
}