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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.bin/top/screen.c	Lines:	46	67	68.7 %
Date:	2016-12-06	Branches:	17	38	44.7 %


/* $OpenBSD: screen.c,v 1.20 2010/02/05 10:21:10 otto Exp $	 */

/*
 *  Top users/processes display for Unix
 *  Version 3
 *
 * Copyright (c) 1984, 1989, William LeFebvre, Rice University
 * Copyright (c) 1989, 1990, 1992, William LeFebvre, Northwestern University
 *
 * 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 OR HIS EMPLOYER 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.
 */

/*
 * This file contains the routines that interface to termcap and stty/gtty.
 *
 * Paul Vixie, February 1987: converted to use ioctl() instead of stty/gtty.
 *
 * I put in code to turn on the TOSTOP bit while top was running, but I didn't
 * really like the results.  If you desire it, turn on the preprocessor
 * variable "TOStop".   --wnl
 */

#include <sys/types.h>
#include <sys/ioctl.h>
#include <curses.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <term.h>
#include <unistd.h>

#include "top.h"
#include "screen.h"
#include "layout.h"
#include "boolean.h"

int	screen_length, screen_width;
char	ch_erase, ch_kill, smart_terminal;

static struct termios old_settings, new_settings;
static char is_a_terminal = No;

void
init_termcap(int interactive)
{
	char *term_name;
	int status;

	/* set defaults in case we aren't smart */
	screen_width = MAX_COLS;
	screen_length = 0;

	if (!interactive) {
		/* pretend we have a dumb terminal */
		smart_terminal = No;
		return;
	}
	/* assume we have a smart terminal until proven otherwise */
	smart_terminal = Yes;

	/* get the terminal name */
	term_name = getenv("TERM");

	/* if there is no TERM, assume it's a dumb terminal */
	/* patch courtesy of Sam Horrocks at telegraph.ics.uci.edu */
	if (term_name == NULL) {
		smart_terminal = No;
		return;
	}

	/* now get the termcap entry */
	if ((status = tgetent(NULL, term_name)) != 1) {
		if (status == -1)
			warnx("can't open termcap file");
		else
			warnx("no termcap entry for a `%s' terminal", term_name);

		/* pretend it's dumb and proceed */
		smart_terminal = No;
		return;
	}

	/* "hardcopy" immediately indicates a very stupid terminal */
	if (tgetflag("hc")) {
		smart_terminal = No;
		return;
	}

	/* set up common terminal capabilities */
	if ((screen_length = tgetnum("li")) <= y_procs) {
		screen_length = smart_terminal = 0;
		return;
	}

	/* screen_width is a little different */
	if ((screen_width = tgetnum("co")) == -1)
		screen_width = 79;
	else
		screen_width -= 1;

        /* get necessary capabilities */
        if (tgetstr("cl", NULL) == NULL || tgetstr("cm", NULL) == NULL) {
                smart_terminal = No;
                return;
        }

	/* get the actual screen size with an ioctl, if needed */
	/*
	 * This may change screen_width and screen_length, and it always sets
	 * lower_left.
	 */
	get_screensize();

	/* if stdout is not a terminal, pretend we are a dumb terminal */
	if (tcgetattr(STDOUT_FILENO, &old_settings) == -1)
		smart_terminal = No;
}

void
init_screen(void)
{
	/* get the old settings for safe keeping */
	if (tcgetattr(STDOUT_FILENO, &old_settings) != -1) {
		/* copy the settings so we can modify them */
		new_settings = old_settings;
		/* turn off ICANON, character echo and tab expansion */
		new_settings.c_lflag &= ~(ICANON | ECHO);
		new_settings.c_oflag &= ~(OXTABS);
		new_settings.c_cc[VMIN] = 1;
		new_settings.c_cc[VTIME] = 0;

		(void) tcsetattr(STDOUT_FILENO, TCSADRAIN, &new_settings);
		/* remember the erase and kill characters */
		ch_erase = old_settings.c_cc[VERASE];
		ch_kill = old_settings.c_cc[VKILL];

		is_a_terminal = Yes;
#if 0
		/* send the termcap initialization string */
		putcap(terminal_init);
#endif
	}
	if (!is_a_terminal) {
		/* not a terminal at all---consider it dumb */
		smart_terminal = No;
	}

	if (smart_terminal)
		initscr();
}

void
end_screen(void)
{
	if (smart_terminal) {
		move(screen_length-1, 0);
		clrtoeol();
		refresh();
		endwin();
	}
	if (is_a_terminal)
		(void) tcsetattr(STDOUT_FILENO, TCSADRAIN, &old_settings);
}

void
reinit_screen(void)
{
#if 0
	/* install our settings if it is a terminal */
	if (is_a_terminal)
		(void) tcsetattr(STDOUT_FILENO, TCSADRAIN, &new_settings);

	/* send init string */
	if (smart_terminal)
		putcap(terminal_init);
#endif
}

void
get_screensize(void)
{
	struct winsize ws;

	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) != -1) {
		if (ws.ws_row != 0)
			screen_length = ws.ws_row;
		if (ws.ws_col != 0)
			screen_width = ws.ws_col - 1;
	}
}

void
go_home(void)
{
	if (smart_terminal) {
		move(0, 0);
		refresh();
	}
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: screen.c,v 1.20 2010/02/05 10:21:10 otto Exp $ */
2
3			/*
4			* Top users/processes display for Unix
5			* Version 3
6			*
7			* Copyright (c) 1984, 1989, William LeFebvre, Rice University
8			* Copyright (c) 1989, 1990, 1992, William LeFebvre, Northwestern University
9			*
10			* Redistribution and use in source and binary forms, with or without
11			* modification, are permitted provided that the following conditions
12			* are met:
13			* 1. Redistributions of source code must retain the above copyright
14			* notice, this list of conditions and the following disclaimer.
15			* 2. Redistributions in binary form must reproduce the above copyright
16			* notice, this list of conditions and the following disclaimer in the
17			* documentation and/or other materials provided with the distribution.
18			*
19			* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20			* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21			* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22			* IN NO EVENT SHALL THE AUTHOR OR HIS EMPLOYER BE LIABLE FOR ANY DIRECT, INDIRECT,
23			* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24			* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25			* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26			* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27			* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28			* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29			*/
30
31			/*
32			* This file contains the routines that interface to termcap and stty/gtty.
33			*
34			* Paul Vixie, February 1987: converted to use ioctl() instead of stty/gtty.
35			*
36			* I put in code to turn on the TOSTOP bit while top was running, but I didn't
37			* really like the results. If you desire it, turn on the preprocessor
38			* variable "TOStop". --wnl
39			*/
40
41			#include <sys/types.h>
42			#include <sys/ioctl.h>
43			#include <curses.h>
44			#include <err.h>
45			#include <stdio.h>
46			#include <stdlib.h>
47			#include <term.h>
48			#include <unistd.h>
49
50			#include "top.h"
51			#include "screen.h"
52			#include "layout.h"
53			#include "boolean.h"
54
55			int screen_length, screen_width;
56			char ch_erase, ch_kill, smart_terminal;
57
58			static struct termios old_settings, new_settings;
59			static char is_a_terminal = No;
60
61			void
62			init_termcap(int interactive)
63		1	{
64			char *term_name;
65			int status;
66
67			/* set defaults in case we aren't smart */
68		1	screen_width = MAX_COLS;
69		1	screen_length = 0;
70
71	✗✓	1	if (!interactive) {
72			/* pretend we have a dumb terminal */
73			smart_terminal = No;
74			return;
75			}
76			/* assume we have a smart terminal until proven otherwise */
77		1	smart_terminal = Yes;
78
79			/* get the terminal name */
80		1	term_name = getenv("TERM");
81
82			/* if there is no TERM, assume it's a dumb terminal */
83			/* patch courtesy of Sam Horrocks at telegraph.ics.uci.edu */
84	✗✓	1	if (term_name == NULL) {
85			smart_terminal = No;
86			return;
87			}
88
89			/* now get the termcap entry */
90	✗✓	1	if ((status = tgetent(NULL, term_name)) != 1) {
91			if (status == -1)
92			warnx("can't open termcap file");
93			else
94			warnx("no termcap entry for a `%s' terminal", term_name);
95
96			/* pretend it's dumb and proceed */
97			smart_terminal = No;
98			return;
99			}
100
101			/* "hardcopy" immediately indicates a very stupid terminal */
102	✗✓	1	if (tgetflag("hc")) {
103			smart_terminal = No;
104			return;
105			}
106
107			/* set up common terminal capabilities */
108	✗✓	1	if ((screen_length = tgetnum("li")) <= y_procs) {
109			screen_length = smart_terminal = 0;
110			return;
111			}
112
113			/* screen_width is a little different */
114	✗✓	1	if ((screen_width = tgetnum("co")) == -1)
115			screen_width = 79;
116			else
117		1	screen_width -= 1;
118
119			/* get necessary capabilities */
120	✓✗✗✓	1	if (tgetstr("cl", NULL) == NULL \|\| tgetstr("cm", NULL) == NULL) {
121			smart_terminal = No;
122			return;
123			}
124
125			/* get the actual screen size with an ioctl, if needed */
126			/*
127			* This may change screen_width and screen_length, and it always sets
128			* lower_left.
129			*/
130		1	get_screensize();
131
132			/* if stdout is not a terminal, pretend we are a dumb terminal */
133	✗✓	1	if (tcgetattr(STDOUT_FILENO, &old_settings) == -1)
134			smart_terminal = No;
135			}
136
137			void
138			init_screen(void)
139		1	{
140			/* get the old settings for safe keeping */
141	✓✗	1	if (tcgetattr(STDOUT_FILENO, &old_settings) != -1) {
142			/* copy the settings so we can modify them */
143		1	new_settings = old_settings;
144			/* turn off ICANON, character echo and tab expansion */
145		1	new_settings.c_lflag &= ~(ICANON \| ECHO);
146		1	new_settings.c_oflag &= ~(OXTABS);
147		1	new_settings.c_cc[VMIN] = 1;
148		1	new_settings.c_cc[VTIME] = 0;
149
150		1	(void) tcsetattr(STDOUT_FILENO, TCSADRAIN, &new_settings);
151			/* remember the erase and kill characters */
152		1	ch_erase = old_settings.c_cc[VERASE];
153		1	ch_kill = old_settings.c_cc[VKILL];
154
155		1	is_a_terminal = Yes;
156			#if 0
157			/* send the termcap initialization string */
158			putcap(terminal_init);
159			#endif
160			}
161	✗✓	1	if (!is_a_terminal) {
162			/* not a terminal at all---consider it dumb */
163			smart_terminal = No;
164			}
165
166	✓✗	1	if (smart_terminal)
167		1	initscr();
168		1	}
169
170			void
171			end_screen(void)
172		1	{
173	✓✗	1	if (smart_terminal) {
174		1	move(screen_length-1, 0);
175		1	clrtoeol();
176		1	refresh();
177		1	endwin();
178			}
179	✓✗	1	if (is_a_terminal)
180		1	(void) tcsetattr(STDOUT_FILENO, TCSADRAIN, &old_settings);
181		1	}
182
183			void
184			reinit_screen(void)
185			{
186			#if 0
187			/* install our settings if it is a terminal */
188			if (is_a_terminal)
189			(void) tcsetattr(STDOUT_FILENO, TCSADRAIN, &new_settings);
190
191			/* send init string */
192			if (smart_terminal)
193			putcap(terminal_init);
194			#endif
195			}
196
197			void
198			get_screensize(void)
199		1	{
200			struct winsize ws;
201
202	✓✗	1	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) != -1) {
203	✓✗	1	if (ws.ws_row != 0)
204		1	screen_length = ws.ws_row;
205	✓✗	1	if (ws.ws_col != 0)
206		1	screen_width = ws.ws_col - 1;
207			}
208		1	}
209
210			void
211			go_home(void)
212			{
213			if (smart_terminal) {
214			move(0, 0);
215			refresh();
216			}
217			}