GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.bin/top/screen.c Lines: 0 60 0.0 %
Date: 2017-11-13 Branches: 0 36 0.0 %

Line Branch Exec Source
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/* $OpenBSD: screen.c,v 1.21 2017/03/15 04:24:14 deraadt Exp $	 */
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/*
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 *  Top users/processes display for Unix
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 *  Version 3
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 *
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 * Copyright (c) 1984, 1989, William LeFebvre, Rice University
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 * Copyright (c) 1989, 1990, 1992, William LeFebvre, Northwestern University
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR OR HIS EMPLOYER BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/*
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 * This file contains the routines that interface to termcap and stty/gtty.
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 *
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 * Paul Vixie, February 1987: converted to use ioctl() instead of stty/gtty.
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 *
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 * I put in code to turn on the TOSTOP bit while top was running, but I didn't
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 * really like the results.  If you desire it, turn on the preprocessor
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 * variable "TOStop".   --wnl
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 */
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <curses.h>
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#include <err.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <term.h>
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#include <unistd.h>
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#include "top.h"
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#include "screen.h"
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#include "layout.h"
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#include "boolean.h"
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int	screen_length, screen_width;
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char	ch_erase, ch_kill, smart_terminal;
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static struct termios old_settings, new_settings;
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static char is_a_terminal = No;
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void
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init_termcap(int interactive)
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{
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	char *term_name;
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	int status;
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	/* set defaults in case we aren't smart */
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	screen_width = MAX_COLS;
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	screen_length = 0;
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	if (!interactive) {
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		/* pretend we have a dumb terminal */
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		smart_terminal = No;
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		return;
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	}
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	/* assume we have a smart terminal until proven otherwise */
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	smart_terminal = Yes;
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	/* get the terminal name */
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	term_name = getenv("TERM");
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	/* if there is no TERM, assume it's a dumb terminal */
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	/* patch courtesy of Sam Horrocks at telegraph.ics.uci.edu */
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	if (term_name == NULL) {
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		smart_terminal = No;
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		return;
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	}
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	/* now get the termcap entry */
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	if ((status = tgetent(NULL, term_name)) != 1) {
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		if (status == -1)
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			warnx("can't open termcap file");
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		else
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			warnx("no termcap entry for a `%s' terminal", term_name);
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		/* pretend it's dumb and proceed */
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		smart_terminal = No;
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		return;
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	}
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	/* "hardcopy" immediately indicates a very stupid terminal */
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	if (tgetflag("hc")) {
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		smart_terminal = No;
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		return;
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	}
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	/* set up common terminal capabilities */
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	if ((screen_length = tgetnum("li")) <= y_procs) {
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		screen_length = smart_terminal = 0;
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		return;
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	}
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	/* screen_width is a little different */
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	if ((screen_width = tgetnum("co")) == -1)
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		screen_width = 79;
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	else
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		screen_width -= 1;
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	/* get necessary capabilities */
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	if (tgetstr("cl", NULL) == NULL || tgetstr("cm", NULL) == NULL) {
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		smart_terminal = No;
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		return;
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	}
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	/* get the actual screen size with an ioctl, if needed */
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	/*
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	 * This may change screen_width and screen_length, and it always sets
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	 * lower_left.
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	 */
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	get_screensize();
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	/* if stdout is not a terminal, pretend we are a dumb terminal */
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	if (tcgetattr(STDOUT_FILENO, &old_settings) == -1)
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		smart_terminal = No;
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}
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void
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init_screen(void)
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{
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	/* get the old settings for safe keeping */
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	if (tcgetattr(STDOUT_FILENO, &old_settings) != -1) {
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		/* copy the settings so we can modify them */
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		new_settings = old_settings;
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		/* turn off ICANON, character echo and tab expansion */
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		new_settings.c_lflag &= ~(ICANON | ECHO);
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		new_settings.c_oflag &= ~(OXTABS);
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		new_settings.c_cc[VMIN] = 1;
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		new_settings.c_cc[VTIME] = 0;
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		(void) tcsetattr(STDOUT_FILENO, TCSADRAIN, &new_settings);
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		/* remember the erase and kill characters */
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		ch_erase = old_settings.c_cc[VERASE];
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		ch_kill = old_settings.c_cc[VKILL];
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		is_a_terminal = Yes;
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#if 0
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		/* send the termcap initialization string */
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		putcap(terminal_init);
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#endif
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	}
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	if (!is_a_terminal) {
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		/* not a terminal at all---consider it dumb */
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		smart_terminal = No;
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	}
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	if (smart_terminal)
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		initscr();
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}
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void
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end_screen(void)
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{
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	if (smart_terminal) {
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		move(screen_length-1, 0);
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		clrtoeol();
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		refresh();
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		endwin();
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	}
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	if (is_a_terminal)
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		(void) tcsetattr(STDOUT_FILENO, TCSADRAIN, &old_settings);
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}
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void
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reinit_screen(void)
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{
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#if 0
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	/* install our settings if it is a terminal */
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	if (is_a_terminal)
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		(void) tcsetattr(STDOUT_FILENO, TCSADRAIN, &new_settings);
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	/* send init string */
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	if (smart_terminal)
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		putcap(terminal_init);
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#endif
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}
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void
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get_screensize(void)
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{
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	struct winsize ws;
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	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) != -1) {
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		if (ws.ws_row != 0)
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			screen_length = ws.ws_row;
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		if (ws.ws_col != 0)
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			screen_width = ws.ws_col - 1;
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	}
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}
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void
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go_home(void)
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{
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	if (smart_terminal) {
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		move(0, 0);
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		refresh();
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	}
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}