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#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdarg.h>
#include <termios.h>
#include <sys/ioctl.h>
#include <sys/select.h>
#include "tty.h"
void tty_reset(tty_t *tty) {
tcsetattr(tty->fdin, TCSANOW, &tty->original_termios);
}
void tty_close(tty_t *tty) {
tty_reset(tty);
fclose(tty->fout);
close(tty->fdin);
}
void tty_init(tty_t *tty, const char *tty_filename) {
tty->fdin = open(tty_filename, O_RDONLY);
if (tty->fdin < 0) {
perror("Failed to open tty");
exit(EXIT_FAILURE);
}
tty->fout = fopen(tty_filename, "w");
if (!tty->fout) {
perror("Failed to open tty");
exit(EXIT_FAILURE);
}
if (setvbuf(tty->fout, NULL, _IOFBF, 4096)) {
perror("setvbuf");
exit(EXIT_FAILURE);
}
if (tcgetattr(tty->fdin, &tty->original_termios)) {
perror("tcgetattr");
exit(EXIT_FAILURE);
}
struct termios new_termios = tty->original_termios;
/*
* Disable all of
* ICANON Canonical input (erase and kill processing).
* ECHO Echo.
* ISIG Signals from control characters
* ICRNL Conversion of CR characters into NL
*/
new_termios.c_iflag &= ~(ICRNL);
new_termios.c_lflag &= ~(ICANON | ECHO | ISIG);
if (tcsetattr(tty->fdin, TCSANOW, &new_termios))
perror("tcsetattr");
tty_getwinsz(tty);
tty_setnormal(tty);
}
void tty_getwinsz(tty_t *tty) {
struct winsize ws;
if (ioctl(fileno(tty->fout), TIOCGWINSZ, &ws) == -1) {
tty->maxwidth = 80;
tty->maxheight = 25;
} else {
tty->maxwidth = ws.ws_col;
tty->maxheight = ws.ws_row;
}
}
char tty_getchar(tty_t *tty) {
char ch;
int size = read(tty->fdin, &ch, 1);
if (size < 0) {
perror("error reading from tty");
exit(EXIT_FAILURE);
} else if (size == 0) {
/* EOF */
exit(EXIT_FAILURE);
} else {
return ch;
}
}
int tty_input_ready(tty_t *tty) {
fd_set readfs;
struct timeval tv = {0, 0};
FD_ZERO(&readfs);
FD_SET(tty->fdin, &readfs);
select(tty->fdin + 1, &readfs, NULL, NULL, &tv);
return FD_ISSET(tty->fdin, &readfs);
}
static void tty_sgr(tty_t *tty, int code) {
tty_printf(tty, "%c%c%im", 0x1b, '[', code);
}
void tty_setfg(tty_t *tty, int fg) {
if (tty->fgcolor != fg) {
tty_sgr(tty, 30 + fg);
tty->fgcolor = fg;
}
}
void tty_setinvert(tty_t *tty) {
tty_sgr(tty, 7);
}
void tty_setnormal(tty_t *tty) {
tty_sgr(tty, 0);
tty->fgcolor = 9;
}
void tty_newline(tty_t *tty) {
tty_printf(tty, "%c%cK\n", 0x1b, '[');
}
void tty_clearline(tty_t *tty) {
tty_printf(tty, "%c%cK", 0x1b, '[');
}
void tty_setcol(tty_t *tty, int col) {
tty_printf(tty, "%c%c%iG", 0x1b, '[', col + 1);
}
void tty_moveup(tty_t *tty, int i) {
tty_printf(tty, "%c%c%iA", 0x1b, '[', i);
}
void tty_printf(tty_t *tty, const char *fmt, ...) {
va_list args;
va_start(args, fmt);
vfprintf(tty->fout, fmt, args);
va_end(args);
}
void tty_flush(tty_t *tty) {
fflush(tty->fout);
}
size_t tty_getwidth(tty_t *tty) {
return tty->maxwidth;
}
size_t tty_getheight(tty_t *tty) {
return tty->maxheight;
}
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