/*
 * Copyright (C) 1984-2012  Mark Nudelman
 * Modified for use with illumos by Garrett D'Amore.
 * Copyright 2014 Garrett D'Amore <garrett@damore.org>
 *
 * You may distribute under the terms of either the GNU General Public
 * License or the Less License, as specified in the README file.
 *
 * For more information, see the README file.
 */

/*
 * Routines dealing with getting input from the keyboard (i.e. from the user).
 */

#include "less.h"

int tty;
extern int utf_mode;

/*
 * Open keyboard for input.
 */
void
open_getchr(void)
{
        /*
         * Try /dev/tty.
         * If that doesn't work, use file descriptor 2,
         * which in Unix is usually attached to the screen,
         * but also usually lets you read from the keyboard.
         */
        tty = open("/dev/tty", O_RDONLY);
        if (tty == -1)
                tty = STDERR_FILENO;
}

/*
 * Get a character from the keyboard.
 */
int
getchr(void)
{
        unsigned char c;
        int result;

        do {
                result = iread(tty, &c, sizeof (char));
                if (result == READ_INTR)
                        return (READ_INTR);
                if (result < 0) {
                        /*
                         * Don't call error() here,
                         * because error calls getchr!
                         */
                        quit(QUIT_ERROR);
                }
                /*
                 * Various parts of the program cannot handle
                 * an input character of '\0'.
                 * If a '\0' was actually typed, convert it to '\340' here.
                 */
                if (c == '\0')
                        c = 0340;
        } while (result != 1);

        return (c & 0xFF);
}