Differential D34411 Diff 103491 contrib/mg/setupterm.c

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contrib/mg/setupterm.c

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				/* $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>

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

				#include "term_private.h"
				#include "terminfo_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().
				*/

				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;

				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;
				}