101 lines
2.0 KiB
C
101 lines
2.0 KiB
C
#include "terminal.h"
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#include "string.h"
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#include "ctype.h"
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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static inline uint8_t vga_entry_color(enum vga_color fg, enum vga_color bg)
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{
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return fg | bg << 4;
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}
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static inline uint16_t vga_entry(unsigned char uc, uint8_t color)
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{
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return (uint16_t) uc | (uint16_t) color << 8;
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}
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static const size_t VGA_WIDTH = 80;
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static const size_t VGA_HEIGHT = 25;
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size_t terminal_row;
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size_t terminal_column;
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uint8_t terminal_color;
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uint16_t* terminal_buffer;
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void terminal_initialize(void)
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{
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terminal_row = 0;
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terminal_column = 0;
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terminal_color = vga_entry_color(VGA_COLOR_LIGHT_GREY, VGA_COLOR_BLACK);
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terminal_buffer = (uint16_t*) 0xB8000;
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for (size_t y = 0; y < VGA_HEIGHT; y++) {
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for (size_t x = 0; x < VGA_WIDTH; x++) {
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const size_t index = y * VGA_WIDTH + x;
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terminal_buffer[index] = vga_entry(' ', terminal_color);
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}
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}
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}
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void terminal_setcolor(uint8_t color)
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{
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terminal_color = color;
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}
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void terminal_putentryat(char c, uint8_t color, size_t x, size_t y)
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{
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const size_t index = y * VGA_WIDTH + x;
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terminal_buffer[index] = vga_entry(c, color);
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}
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int terminal_putchar(char c)
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{
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if (c == '\n') {
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terminal_column = 0;
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terminal_row++;
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return 1;
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}
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if (!isprint(c))
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return 1;
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terminal_putentryat(c, terminal_color, terminal_column, terminal_row);
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if (++terminal_column == VGA_WIDTH) {
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terminal_column = 0;
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if (++terminal_row == VGA_HEIGHT)
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terminal_row = 0;
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}
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return 1;
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}
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int terminal_write(const char* data, size_t size)
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{
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size_t i;
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for (i = 0; i < size; i++)
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terminal_putchar(data[i]);
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return (int) i;
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}
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int terminal_writestring(const char* data)
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{
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size_t len = strlen(data);
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terminal_write(data, len);
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return len;
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}
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int terminal_writelong(long n)
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{
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long div = 10;
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int rv = 0;
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if (n < 0) {
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rv += terminal_putchar('-');
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n *= -1;
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}
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div = 1;
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while (div <= n / 10)
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div *= 10;
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while (div > 0) {
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rv += terminal_putchar('0' + n / div % 10);
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div /= 10;
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}
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return rv;
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} |