/* $OpenBSD: input.c,v 1.2 2012/07/10 10:28:05 nicm Exp $ */

/*
 * Copyright (c) 2012 Nicholas Marriott <nicm@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>

#include <ctype.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>

#include "cu.h"

/*
 * Prompt and read a line of user input from stdin. We want to use the termios
 * we were started with so restore and stick in a signal handler for ^C.
 */

volatile sig_atomic_t input_stop;

void    input_signal(int);

void
input_signal(int sig)
{
        input_stop = 1;
}

const char *
get_input(const char *prompt)
{
        static char             s[BUFSIZ];
        struct sigaction        act, oact;
        char                    c, *cp, *out = NULL;
        ssize_t                 n;

        memset(&act, 0, sizeof(act));
        sigemptyset(&act.sa_mask);
        act.sa_flags = 0;
        act.sa_handler = input_signal;
        if (sigaction(SIGINT, &act, &oact) != 0)
                cu_err(1, "sigaction");
        input_stop = 0;

        restore_termios();

        printf("%s ", prompt);
        fflush(stdout);

        cp = s;
        while (cp != s + sizeof(s) - 1) {
                n = read(STDIN_FILENO, &c, 1);
                if (n == -1 && errno != EINTR)
                        cu_err(1, "read");
                if (n != 1 || input_stop)
                        break;
                if (c == '\n') {
                        out = s;
                        break;
                }
                if (!iscntrl((u_char)c))
                        *cp++ = c;
        }
        *cp = '\0';

        set_termios();

        sigaction(SIGINT, &oact, NULL);

        return (out);
}