/* $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;
}