/* $NetBSD: setupterm.c,v 1.9 2019/04/11 23:52:08 jakllsch Exp $ */

/*
 * Copyright (c) 2009, 2011 The NetBSD Foundation, Inc.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Roy Marples.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__RCSID("$NetBSD: setupterm.c,v 1.9 2019/04/11 23:52:08 jakllsch Exp $");

#include <sys/ioctl.h>
#include <assert.h>
#include <err.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <unistd.h>
#include <term_private.h>
#include <term.h>

/*
 * use_env is really a curses function - POSIX mandates it's in curses.h
 * But it has to live in terminfo because it must precede a call to setupterm().
 */
#include <curses.h>

static bool __use_env = true;

void
use_env(bool value)
{

        __use_env = value;
}
#define reterr(code, msg)                                                     \
        do {                                                                  \
                if (errret == NULL)                                           \
                        errx(EXIT_FAILURE, msg);                              \
                else {                                                        \
                        *errret = code;                                       \
                        return ERR;                                           \
                }                                                             \
        } while (0 /* CONSTCOND */)

#define reterrarg(code, msg, arg) \
        do {                                                                  \
                if (errret == NULL)                                           \
                        errx(EXIT_FAILURE, msg, arg);                         \
                else {                                                        \
                        *errret = code;                                       \
                        return ERR;                                           \
                }                                                             \
        } while (0 /* CONSTCOND */)


int
ti_setupterm(TERMINAL **nterm, const char *term, int fildes, int *errret)
{
        int error;
        struct winsize win;

        _DIAGASSERT(nterm != NULL);

        if (term == NULL)
                term = getenv("TERM");
        if (term == NULL || *term == '\0') {
                *nterm = NULL;
                reterr(0, "TERM environment variable not set");
        }
        if (fildes == STDOUT_FILENO && !isatty(fildes))
                fildes = STDERR_FILENO;

        *nterm = calloc(1, sizeof(**nterm));
        if (*nterm == NULL)
                reterr(-1, "not enough memory to create terminal structure");

        error = _ti_getterm(*nterm, term, 0);
        if (error != 1) {
                del_curterm(*nterm);
                *nterm = NULL;
                switch (error) {
                case -1:
                        reterr(error, "cannot access the terminfo database");
                        /* NOTREACHED */
                case 0:
                        reterrarg(error,
                            "%s: terminal not listed in terminfo database",
                            term);
                        /* NOTREACHED */
                default:
                        reterr(-1, "unknown error");
                        /* NOTREACHED */
                }
        }

        (*nterm)->fildes = fildes;
        _ti_setospeed(*nterm);
        if (t_generic_type(*nterm))
                reterrarg(0, "%s: generic terminal", term);
        if (t_hard_copy(*nterm))
                reterrarg(1, "%s: hardcopy terminal", term);

        /* If TIOCGWINSZ works, then set initial lines and columns. */
        if (ioctl(fildes, TIOCGWINSZ, &win) != -1 &&
            win.ws_row != 0 && win.ws_col != 0)
        {
                t_lines(*nterm) = (short)win.ws_row;
                t_columns(*nterm) = (short)win.ws_col;
        }

        /* POSIX 1003.2 requires that the environment override. */
        if (__use_env) {
                char *p;

                if ((p = getenv("LINES")) != NULL)
                        t_lines(*nterm) = (short)strtol(p, NULL, 0);
                if ((p = getenv("COLUMNS")) != NULL)
                        t_columns(*nterm) = (short)strtol(p, NULL, 0);
        }

        /* POSIX requires 1 for success */
        if (errret)
                *errret = 1;
        return OK;
}

int
setupterm(const char *term, int fildes, int *errret)
{
        TERMINAL *nterm;
        int ret;

        if (errret != NULL)
                *errret = ERR;
        ret = ti_setupterm(&nterm, term, fildes, errret);
        if (nterm != NULL)
                set_curterm(nterm);
        return ret;
}