/*
 * This module contains the tty "magic" code for fc-shell and fc-tmsh.
 */

#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include <strings.h>
#include <stdlib.h>
#include <unistd.h>
#include <termios.h>

extern int ttyhacks;

struct termios orig_termios, our_termios;

#define	MAX_USER_CMD	78
char usercmd[MAX_USER_CMD+1];
int usercmd_len;

void
tty_init()
{
	if (!ttyhacks)
		return;
	tcgetattr(0, &orig_termios);
	bcopy(&orig_termios, &our_termios, sizeof(struct termios));
	our_termios.c_oflag &= ~(OCRNL | ONOCR | ONLRET);
	our_termios.c_lflag &= ~(ICANON | ECHO);
	our_termios.c_cc[VMIN] = 1;
	our_termios.c_cc[VTIME] = 0;
	tcsetattr(0, TCSAFLUSH, &our_termios);
	putchar('>');
	fflush(stdout);
}

void
tty_cleanup()
{
	if (!ttyhacks)
		return;
	tcsetattr(0, TCSAFLUSH, &orig_termios);
}

void
handle_tty_input()
{
	char buf[256];
	int i, c, cc;

	cc = read(0, buf, sizeof buf);
	if (cc <= 0) {
		tty_cleanup();
		exit(0);
	}
	for (i = 0; i < cc; i++) {
		c = buf[i];
		if (c >= ' ' && c <= '~') {
			if (usercmd_len >= MAX_USER_CMD)
				continue;
			usercmd[usercmd_len++] = c;
			if (ttyhacks)
				putchar(c);	/* echo */
			continue;
		}
		switch (c) {
		case '\b':
		case 0x7F:
			if (!usercmd_len)
				continue;
			usercmd_len--;
			if (ttyhacks) {
				putchar('\b');
				putchar(' ');
				putchar('\b');
			}
			continue;
		case '\n':
		case '\r':
			usercmd[usercmd_len] = '\0';
			if (ttyhacks)
				putchar('\n');	/* echo */
			dispatch_user_cmd();
			usercmd_len = 0;
			if (ttyhacks)
				putchar('>');	/* new prompt */
		}
	}
}

void
async_msg_output(msg)
	char *msg;
{
	int msglen, i;

	msglen = strlen(msg);
	if (ttyhacks)
		putchar('\r');
	fputs(msg, stdout);
	if (ttyhacks)
		for (i = msglen; i < usercmd_len + 1; i++)
			putchar(' ');
	putchar('\n');
	if (!ttyhacks)
		return;
	/* reprint the input line */
	putchar('>');
	if (!usercmd_len)
		return;
	fwrite(usercmd, 1, usercmd_len, stdout);
}