162 lines
3.1 KiB
C++
162 lines
3.1 KiB
C++
/* Console.cc
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* vim: set tw=80:
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* Eryn Wells <eryn@erynwells.me>
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*/
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/**
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* Implementation of the Console class.
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*/
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#include "Console.hh"
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namespace kernel {
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/** Create a VGA color pair. */
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static inline uint8_t
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makeVGAColor(Console::Color fg,
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Console::Color bg)
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{
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return uint8_t(fg) | uint8_t(bg) << 4;
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}
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/** Create a VGA character entry. */
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static inline uint16_t
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makeVGAEntry(char c,
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uint8_t color)
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{
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uint16_t c16 = c;
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uint16_t color16 = color;
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return c16 | color16 << 8;
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}
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/*
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* Static
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*/
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Console&
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Console::systemConsole()
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{
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static Console sSystemConsole;
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return sSystemConsole;
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}
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/*
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* Public
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*/
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Console::Console()
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: mBase(reinterpret_cast<uint16_t *>(0xB8000)),
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mCursor{0, 0},
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mColor(makeVGAColor(Console::Color::LightGray, Console::Color::Black))
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{ }
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void
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Console::clear()
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{
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for (size_t y = 0; y < Console::Height; y++) {
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for (size_t x = 0; x < Console::Width; x++) {
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putEntryAt(x, y, ' ', mColor);
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}
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}
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mCursor = {0, 0};
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}
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void
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Console::clear(Console::Color color)
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{
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setColor(Color::LightGray, color);
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clear();
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}
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void
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Console::printChar(char c)
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{
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switch (c) {
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case '\n':
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mCursor.col = 0;
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if (++mCursor.row >= Console::Height) {
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scroll();
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mCursor.row = Console::Height - 1;
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}
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break;
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case '\t':
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mCursor.col += 8;
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if (mCursor.col >= Console::Width) {
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if (++mCursor.row >= Console::Height) {
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scroll();
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mCursor.row = Console::Height - 1;
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}
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mCursor.col %= Console::Width;
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}
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break;
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default:
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putEntryAt(mCursor.col, mCursor.row, c, mColor);
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if (++mCursor.col == Console::Width) {
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mCursor.col = 0;
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if (++mCursor.row >= Console::Height) {
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scroll();
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mCursor.row = Console::Height - 1;
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}
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}
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break;
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}
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}
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void
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Console::printString(const char *str)
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{
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// XXX: THIS IS VERY UNSAFE. PUT DOWN THE POINTER ERYN. NO BAD ERYN DONT YOU DARE.
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const char *cur = str;
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while (*cur != '\0') {
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printChar(*cur++);
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}
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}
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void
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Console::setColor(Console::Color fg,
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Console::Color bg)
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{
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mColor = makeVGAColor(fg, bg);
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}
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/*
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* Private
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*/
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void
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Console::putEntryAt(size_t x,
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size_t y,
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char c,
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uint8_t color)
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{
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const size_t index = y * Console::Width + x;
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mBase[index] = makeVGAEntry(c, color);
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}
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void
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Console::scroll(size_t lines)
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{
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if (lines == 0) {
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return;
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}
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if (lines > Console::Height) {
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clear();
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return;
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}
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uint16_t *dst = mBase;
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uint16_t *src = mBase + lines * Console::Width;
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uint16_t *const end = mBase + Console::Width * Console::Height;
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while (src < end) {
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*dst++ = *src++;
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}
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while (dst < end) {
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*dst++ = makeVGAEntry(' ', mColor);
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}
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}
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} /* namespace kernel */
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