132 lines
3.4 KiB
C
132 lines
3.4 KiB
C
#include <errno.h> // for EAGAIN, errno
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#include <stdio.h> // for perror, sscanf
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#include <stdlib.h> // for atexit, exit
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#include <sys/ioctl.h> // for winsize, ioctl, TIOCGWINSZ
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#include <termios.h> // for termios, tcsetattr, tcgetattr, TCSAFLUSH, cc_t
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#include <unistd.h> // for STDIN_FILENO, STDOUT_FILENO
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#include "terminal.h"
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#include "fn.h" // for E, editorConfig, editorKey::END_KEY, editorKe...
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void die(const char *s) {
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write(STDOUT_FILENO, "\x1b[2J", 4);
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write(STDOUT_FILENO, "\x1b[H", 3);
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perror(s);
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exit(1);
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}
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void disableRawMode() {
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if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &E.orig_termios) == -1)
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die("tcsetattr");
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// Remove the alternate screen and restore the origin one
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write(STDOUT_FILENO, "\x1b[?1049l", 8);
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}
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void enableRawMode() {
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// Use the alternate screen
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write(STDOUT_FILENO, "\x1b[?1049h", 8);
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if (tcgetattr(STDIN_FILENO, &E.orig_termios) == -1)
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die("tcgetattr");
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atexit(disableRawMode);
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struct termios raw = E.orig_termios;
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raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
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raw.c_oflag &= ~(OPOST);
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raw.c_cflag |= (CS8);
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raw.c_lflag &= ~(ECHO | ICANON | ISIG);
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raw.c_cc[VMIN] = 0;
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raw.c_cc[VTIME] = 1;
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if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1)
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die("tcsetattr");
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}
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int editorReadKey() {
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int nread;
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char c;
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while ((nread = read(STDIN_FILENO, &c, 1)) != 1) {
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if (nread == -1 && errno != EAGAIN) die("read");
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}
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// Process escape sequences
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if (c == '\x1b') {
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char seq[3];
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if (read(STDIN_FILENO, &seq[0], 1) != 1) return '\x1b';
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if (read(STDIN_FILENO, &seq[1], 1) != 1) return '\x1b';
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if (seq[0] == '[') {
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if (seq[1] >= '0' && seq[1] <= '9') {
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if (read(STDIN_FILENO, &seq[2], 1) != 1) return '\x1b';
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if (seq[2] == '~') {
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switch (seq[1]) {
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case '1': return HOME_KEY;
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case '3': return DEL_KEY;
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case '4': return END_KEY;
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case '5': return PAGE_UP;
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case '6': return PAGE_DOWN;
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case '7': return HOME_KEY;
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case '8': return END_KEY;
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}
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}
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} else {
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switch (seq[1]) {
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case 'A': return ARROW_UP;
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case 'B': return ARROW_DOWN;
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case 'C': return ARROW_RIGHT;
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case 'D': return ARROW_LEFT;
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}
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}
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} else if (seq[0] == '0') {
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switch (seq[1]) {
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case 'H': return HOME_KEY;
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case 'F': return END_KEY;
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}
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}
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return '\x1b';
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} else {
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return c;
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}
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}
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int getCursorPosition(int *rows, int *cols) {
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char buf[32];
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unsigned int i = 0;
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if (write(STDOUT_FILENO, "\x1b[6n", 4) != 4) // CPR (custor position report)
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return -1;
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while (i < sizeof(buf) - 1) {
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if (read(STDIN_FILENO, &buf[i], 1) != 1) break;
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if (buf[i] == 'R') break;
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i++;
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}
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buf[i] = '\0';
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if (buf[0] != '\x1b' || buf[1] != '[') return -1;
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if (sscanf(&buf[2], "%d;%d", rows, cols) != 2) return -1;
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return 0;
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}
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int setWindowSize(int *rows, int *cols) {
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struct winsize ws;
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if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 || ws.ws_col == 0) {
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// Move cursor to the lower right as a fallback if TIOCGWINSZ does
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// not work. We count the columns and rows then by hand.
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if (write(STDOUT_FILENO, "\x1b[999C\x1b[999B", 12) != 12)
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return -1;
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return getCursorPosition(rows, cols);
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return -1;
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} else {
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*cols = ws.ws_col;
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*rows = ws.ws_row;
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return 0;
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}
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}
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