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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.bin/mg/ttyio.c	Lines:	0	73	0.0 %
Date:	2017-11-13	Branches:	0	44	0.0 %


/*	$OpenBSD: ttyio.c,v 1.37 2015/03/23 12:31:19 bcallah Exp $	*/

/* This file is in the public domain. */

/*
 * POSIX terminal I/O.
 *
 * The functions in this file negotiate with the operating system for
 * keyboard characters, and write characters to the display in a barely
 * buffered fashion.
 */

#include <sys/ioctl.h>
#include <sys/queue.h>
#include <sys/time.h>
#include <sys/types.h>
#include <errno.h>
#include <fcntl.h>
#include <poll.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <term.h>
#include <termios.h>
#include <unistd.h>

#include "def.h"

#define NOBUF	512			/* Output buffer size. */

int	ttstarted;
char	obuf[NOBUF];			/* Output buffer. */
size_t	nobuf;				/* Buffer count. */
struct	termios	oldtty;			/* POSIX tty settings. */
struct	termios	newtty;
int	nrow;				/* Terminal size, rows. */
int	ncol;				/* Terminal size, columns. */

/*
 * This function gets called once, to set up the terminal.
 * On systems w/o TCSASOFT we turn off off flow control,
 * which isn't really the right thing to do.
 */
void
ttopen(void)
{
	if (!isatty(STDIN_FILENO) || !isatty(STDOUT_FILENO))
		panic("standard input and output must be a terminal");

	if (ttraw() == FALSE)
		panic("aborting due to terminal initialize failure");
}

/*
 * This function sets the terminal to RAW mode, as defined for the current
 * shell.  This is called both by ttopen() above and by spawncli() to
 * get the current terminal settings and then change them to what
 * mg expects.	Thus, tty changes done while spawncli() is in effect
 * will be reflected in mg.
 */
int
ttraw(void)
{
	if (tcgetattr(0, &oldtty) < 0) {
		dobeep();
		ewprintf("ttopen can't get terminal attributes");
		return (FALSE);
	}
	(void)memcpy(&newtty, &oldtty, sizeof(newtty));
	/* Set terminal to 'raw' mode and ignore a 'break' */
	newtty.c_cc[VMIN] = 1;
	newtty.c_cc[VTIME] = 0;
	newtty.c_iflag |= IGNBRK;
	newtty.c_iflag &= ~(BRKINT | PARMRK | INLCR | IGNCR | ICRNL | IXON);
	newtty.c_oflag &= ~OPOST;
	newtty.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);

	if (tcsetattr(0, TCSASOFT | TCSADRAIN, &newtty) < 0) {
		dobeep();
		ewprintf("ttopen can't tcsetattr");
		return (FALSE);
	}
	ttstarted = 1;

	return (TRUE);
}

/*
 * This function gets called just before we go back home to the shell.
 * Put all of the terminal parameters back.
 * Under UN*X this just calls ttcooked(), but the ttclose() hook is in
 * because vttidy() in display.c expects it for portability reasons.
 */
void
ttclose(void)
{
	if (ttstarted) {
		if (ttcooked() == FALSE)
			panic("");	/* ttcooked() already printf'd */
		ttstarted = 0;
	}
}

/*
 * This function restores all terminal settings to their default values,
 * in anticipation of exiting or suspending the editor.
 */
int
ttcooked(void)
{
	ttflush();
	if (tcsetattr(0, TCSASOFT | TCSADRAIN, &oldtty) < 0) {
		dobeep();
		ewprintf("ttclose can't tcsetattr");
		return (FALSE);
	}
	return (TRUE);
}

/*
 * Write character to the display.  Characters are buffered up,
 * to make things a little bit more efficient.
 */
int
ttputc(int c)
{
	if (nobuf >= NOBUF)
		ttflush();
	obuf[nobuf++] = c;
	return (c);
}

/*
 * Flush output.
 */
void
ttflush(void)
{
	ssize_t	 written;
	char	*buf = obuf;

	if (nobuf == 0)
		return;

	while ((written = write(fileno(stdout), buf, nobuf)) != nobuf) {
		if (written == -1) {
			if (errno == EINTR)
				continue;
			panic("ttflush write failed");
		}
		buf += written;
		nobuf -= written;
	}
	nobuf = 0;
}

/*
 * Read character from terminal. All 8 bits are returned, so that you
 * can use a multi-national terminal.
 */
int
ttgetc(void)
{
	char	c;
	ssize_t	ret;

	do {
		ret = read(STDIN_FILENO, &c, 1);
		if (ret == -1 && errno == EINTR) {
			if (winch_flag) {
				redraw(0, 0);
				winch_flag = 0;
			}
		} else if (ret == -1 && errno == EIO)
			panic("lost stdin");
		else if (ret == 1)
			break;
	} while (1);
	return ((int) c) & 0xFF;
}

/*
 * Returns TRUE if there are characters waiting to be read.
 */
int
charswaiting(void)
{
	int	x;

	return ((ioctl(0, FIONREAD, &x) < 0) ? 0 : x);
}

/*
 * panic - just exit, as quickly as we can.
 */
void
panic(char *s)
{
	static int panicking = 0;

	if (panicking)
		return;
	else
		panicking = 1;
	ttclose();
	(void) fputs("panic: ", stderr);
	(void) fputs(s, stderr);
	(void) fputc('\n', stderr);
	exit(1);
}

/*
 * This function returns FALSE if any characters have showed up on the
 * tty before 'msec' milliseconds.
 */
int
ttwait(int msec)
{
	struct pollfd	pfd[1];

	pfd[0].fd = 0;
	pfd[0].events = POLLIN;

	if ((poll(pfd, 1, msec)) == 0)
		return (TRUE);
	return (FALSE);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: ttyio.c,v 1.37 2015/03/23 12:31:19 bcallah Exp $ */
2
3			/* This file is in the public domain. */
4
5			/*
6			* POSIX terminal I/O.
7			*
8			* The functions in this file negotiate with the operating system for
9			* keyboard characters, and write characters to the display in a barely
10			* buffered fashion.
11			*/
12
13			#include <sys/ioctl.h>
14			#include <sys/queue.h>
15			#include <sys/time.h>
16			#include <sys/types.h>
17			#include <errno.h>
18			#include <fcntl.h>
19			#include <poll.h>
20			#include <signal.h>
21			#include <stdio.h>
22			#include <stdlib.h>
23			#include <string.h>
24			#include <term.h>
25			#include <termios.h>
26			#include <unistd.h>
27
28			#include "def.h"
29
30			#define NOBUF 512 /* Output buffer size. */
31
32			int ttstarted;
33			char obuf[NOBUF]; /* Output buffer. */
34			size_t nobuf; /* Buffer count. */
35			struct termios oldtty; /* POSIX tty settings. */
36			struct termios newtty;
37			int nrow; /* Terminal size, rows. */
38			int ncol; /* Terminal size, columns. */
39
40			/*
41			* This function gets called once, to set up the terminal.
42			* On systems w/o TCSASOFT we turn off off flow control,
43			* which isn't really the right thing to do.
44			*/
45			void
46			ttopen(void)
47			{
48			if (!isatty(STDIN_FILENO) \|\| !isatty(STDOUT_FILENO))
49			panic("standard input and output must be a terminal");
50
51			if (ttraw() == FALSE)
52			panic("aborting due to terminal initialize failure");
53			}
54
55			/*
56			* This function sets the terminal to RAW mode, as defined for the current
57			* shell. This is called both by ttopen() above and by spawncli() to
58			* get the current terminal settings and then change them to what
59			* mg expects. Thus, tty changes done while spawncli() is in effect
60			* will be reflected in mg.
61			*/
62			int
63			ttraw(void)
64			{
65			if (tcgetattr(0, &oldtty) < 0) {
66			dobeep();
67			ewprintf("ttopen can't get terminal attributes");
68			return (FALSE);
69			}
70			(void)memcpy(&newtty, &oldtty, sizeof(newtty));
71			/* Set terminal to 'raw' mode and ignore a 'break' */
72			newtty.c_cc[VMIN] = 1;
73			newtty.c_cc[VTIME] = 0;
74			newtty.c_iflag \|= IGNBRK;
75			newtty.c_iflag &= ~(BRKINT \| PARMRK \| INLCR \| IGNCR \| ICRNL \| IXON);
76			newtty.c_oflag &= ~OPOST;
77			newtty.c_lflag &= ~(ECHO \| ECHONL \| ICANON \| ISIG \| IEXTEN);
78
79			if (tcsetattr(0, TCSASOFT \| TCSADRAIN, &newtty) < 0) {
80			dobeep();
81			ewprintf("ttopen can't tcsetattr");
82			return (FALSE);
83			}
84			ttstarted = 1;
85
86			return (TRUE);
87			}
88
89			/*
90			* This function gets called just before we go back home to the shell.
91			* Put all of the terminal parameters back.
92			* Under UN*X this just calls ttcooked(), but the ttclose() hook is in
93			* because vttidy() in display.c expects it for portability reasons.
94			*/
95			void
96			ttclose(void)
97			{
98			if (ttstarted) {
99			if (ttcooked() == FALSE)
100			panic(""); /* ttcooked() already printf'd */
101			ttstarted = 0;
102			}
103			}
104
105			/*
106			* This function restores all terminal settings to their default values,
107			* in anticipation of exiting or suspending the editor.
108			*/
109			int
110			ttcooked(void)
111			{
112			ttflush();
113			if (tcsetattr(0, TCSASOFT \| TCSADRAIN, &oldtty) < 0) {
114			dobeep();
115			ewprintf("ttclose can't tcsetattr");
116			return (FALSE);
117			}
118			return (TRUE);
119			}
120
121			/*
122			* Write character to the display. Characters are buffered up,
123			* to make things a little bit more efficient.
124			*/
125			int
126			ttputc(int c)
127			{
128			if (nobuf >= NOBUF)
129			ttflush();
130			obuf[nobuf++] = c;
131			return (c);
132			}
133
134			/*
135			* Flush output.
136			*/
137			void
138			ttflush(void)
139			{
140			ssize_t written;
141			char *buf = obuf;
142
143			if (nobuf == 0)
144			return;
145
146			while ((written = write(fileno(stdout), buf, nobuf)) != nobuf) {
147			if (written == -1) {
148			if (errno == EINTR)
149			continue;
150			panic("ttflush write failed");
151			}
152			buf += written;
153			nobuf -= written;
154			}
155			nobuf = 0;
156			}
157
158			/*
159			* Read character from terminal. All 8 bits are returned, so that you
160			* can use a multi-national terminal.
161			*/
162			int
163			ttgetc(void)
164			{
165			char c;
166			ssize_t ret;
167
168			do {
169			ret = read(STDIN_FILENO, &c, 1);
170			if (ret == -1 && errno == EINTR) {
171			if (winch_flag) {
172			redraw(0, 0);
173			winch_flag = 0;
174			}
175			} else if (ret == -1 && errno == EIO)
176			panic("lost stdin");
177			else if (ret == 1)
178			break;
179			} while (1);
180			return ((int) c) & 0xFF;
181			}
182
183			/*
184			* Returns TRUE if there are characters waiting to be read.
185			*/
186			int
187			charswaiting(void)
188			{
189			int x;
190
191			return ((ioctl(0, FIONREAD, &x) < 0) ? 0 : x);
192			}
193
194			/*
195			* panic - just exit, as quickly as we can.
196			*/
197			void
198			panic(char *s)
199			{
200			static int panicking = 0;
201
202			if (panicking)
203			return;
204			else
205			panicking = 1;
206			ttclose();
207			(void) fputs("panic: ", stderr);
208			(void) fputs(s, stderr);
209			(void) fputc('\n', stderr);
210			exit(1);
211			}
212
213			/*
214			* This function returns FALSE if any characters have showed up on the
215			* tty before 'msec' milliseconds.
216			*/
217			int
218			ttwait(int msec)
219			{
220			struct pollfd pfd[1];
221
222			pfd[0].fd = 0;
223			pfd[0].events = POLLIN;
224
225			if ((poll(pfd, 1, msec)) == 0)
226			return (TRUE);
227			return (FALSE);
228			}