116 lines
2.2 KiB
C
116 lines
2.2 KiB
C
#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/ioctl.h>
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#include <termios.h>
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#include <unistd.h>
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void enable_raw_mode();
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void disable_raw_mode();
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int get_window_size(int *, int *);
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void editor_init();
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void editor_redraw_screen();
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void editor_clear_screen();
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void editor_draw_rows();
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void editor_process_key();
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void die(const char *);
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#define CTRL_KEY(key) ((key) & 0x1f)
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struct {
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struct termios orig_termios;
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int rows;
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int cols;
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} E;
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int main() {
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editor_init();
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enable_raw_mode();
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while (1) {
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editor_redraw_screen();
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editor_process_key();
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}
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return 0;
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}
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void enable_raw_mode() {
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if (tcgetattr(STDIN_FILENO, &E.orig_termios) == -1) die("tcgetattr");
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atexit(disable_raw_mode);
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struct termios raw = E.orig_termios;
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cfmakeraw(&raw);
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if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1) die("tcsetattr");
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}
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void disable_raw_mode() {
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if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &E.orig_termios) == -1)
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die("tcsetattr");
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}
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int get_window_size(int *rows, int *cols) {
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struct winsize ws;
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if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) != -1 && ws.ws_col != 0) {
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*rows = ws.ws_row;
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*cols = ws.ws_col;
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return 0;
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}
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return -1;
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}
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void editor_init() {
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if (!isatty(STDIN_FILENO)) {
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printf("kilo only supports a terminal at standard in. Exiting.");
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exit(1);
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}
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if (get_window_size(&E.rows, &E.cols) == -1) die("get_window_size");
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}
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void editor_redraw_screen() {
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editor_clear_screen();
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editor_draw_rows();
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write(STDIN_FILENO, "\x1b[H", 3);
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}
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void editor_clear_screen() {
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write(STDIN_FILENO, "\x1b[2J", 4);
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write(STDIN_FILENO, "\x1b[H", 3);
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}
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void editor_draw_rows() {
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for (int y = 0; y < E.rows - 1; y++)
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write(STDIN_FILENO, "~\r\n", 3);
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write(STDIN_FILENO, "~", 1);
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}
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void editor_process_key() {
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char c;
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read(STDIN_FILENO, &c, 1);
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switch (c) {
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case CTRL_KEY('Q'):
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editor_clear_screen();
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exit(0);
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break;
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default:
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printf("%d\r\n", c);
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break;
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}
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}
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void die(const char *s) {
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editor_clear_screen();
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perror(s);
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exit(1);
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}
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