File: screen.c

package info (click to toggle)
ptop 3.6.2-5
  • links: PTS, VCS
  • area: main
  • in suites: wheezy
  • size: 1,516 kB
  • sloc: ansic: 18,233; sh: 3,493; makefile: 124; awk: 44
file content (512 lines) | stat: -rw-r--r-- 9,920 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
/*
 *	Top users/processes display for Unix
 *	Version 3
 *
 *	This program may be freely redistributed,
 *	but this entire comment MUST remain intact.
 *
 *	Copyright (c) 1984, 1989, William LeFebvre, Rice University
 *	Copyright (c) 1989, 1990, 1992, William LeFebvre, Northwestern University
 */

/*	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 "os.h"
#include "pg_top.h"

#include <sys/ioctl.h>
#ifdef CBREAK
#include <sgtty.h>
#define SGTTY
#else
#ifdef TCGETA
#define TERMIO
#include <termio.h>
#else
#define TERMIOS
#include <termios.h>
#endif
#endif
#if defined(TERMIO) || defined(TERMIOS)
#ifndef TAB3
#ifdef OXTABS
#define TAB3 OXTABS
#else
#define TAB3 0
#endif
#endif
#endif
#include "screen.h"
#include "boolean.h"

extern char *myname;

int			overstrike;
int			screen_length;
int			screen_width;
char		ch_erase;
char		ch_kill;
char		smart_terminal;
char		PC;
char	   *tgetstr();
char	   *tgoto();
char		termcap_buf[1024];
char		string_buffer[1024];
char		home[15];
char		lower_left[15];
char	   *clear_line;
char	   *clear_screen;
char	   *clear_to_end;
char	   *cursor_motion;
char	   *start_standout;
char	   *end_standout;
char	   *terminal_init;
char	   *terminal_end;

#ifdef SGTTY
static struct sgttyb old_settings;
static struct sgttyb new_settings;
#endif
#ifdef TERMIO
static struct termio old_settings;
static struct termio new_settings;
#endif
#ifdef TERMIOS
static struct termios old_settings;
static struct termios new_settings;
#endif
static char is_a_terminal = No;

#ifdef TOStop
static int	old_lword;
static int	new_lword;
#endif

#define STDIN	0
#define STDOUT	1
#define STDERR	2

/* This has to be defined as a subroutine for tputs (instead of a macro) */

int
putstdout(int ch)

{
	return putchar((unsigned int) ch);
}

void
get_screensize()

{

#ifdef TIOCGWINSZ

	struct winsize ws;

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

	struct ttysize ts;

	if (ioctl(1, TIOCGSIZE, &ts) != -1)
	{
		if (ts.ts_lines != 0)
		{
			screen_length = ts.ts_lines;
		}
		if (ts.ts_cols != 0)
		{
			screen_width = ts.ts_cols - 1;
		}
	}
#endif   /* TIOCGSIZE */
#endif   /* TIOCGWINSZ */

	char *lower_left_motion = "";
	// get_screensize() can be called from main() without cursor_motion
	// having been set, so we protect against that possibility.
	if (smart_terminal == Yes)
	{
		// We need to account for the fact that tgoto() might return NULL.
		lower_left_motion = tgoto(cursor_motion, 0, screen_length - 1);
		if (lower_left_motion == NULL)
		{
			lower_left_motion = "";
		}
	}
	(void) strcpy(lower_left, lower_left_motion);
}

void
init_termcap(int interactive)

{
	char	   *bufptr;
	char	   *PCptr;
	char	   *term_name;
	char	   *getenv();
	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(termcap_buf, term_name)) != 1)
	{
		if (status == -1)
		{
			fprintf(stderr, "%s: can't open termcap file\n", myname);
		}
		else
		{
			fprintf(stderr, "%s: no termcap entry for a `%s' terminal\n",
					myname, 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")) <= 0)
	{
		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;
	}

	/* terminals that overstrike need special attention */
	overstrike = tgetflag("os");

	/* initialize the pointer into the termcap string buffer */
	bufptr = string_buffer;

	/* get "ce", clear to end */
	if (!overstrike)
	{
		clear_line = tgetstr("ce", &bufptr);
	}

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

	/* get some more sophisticated stuff -- these are optional */
	clear_to_end = tgetstr("cd", &bufptr);
	terminal_init = tgetstr("ti", &bufptr);
	terminal_end = tgetstr("te", &bufptr);
	start_standout = tgetstr("so", &bufptr);
	end_standout = tgetstr("se", &bufptr);

	/* pad character */
	PC = (PCptr = tgetstr("pc", &bufptr)) ? *PCptr : 0;

	/* set convenience strings */
	// We need to account for the fact that tgoto() might return NULL.
	char *home_motion = tgoto(cursor_motion, 0, 0);
	if (home_motion == NULL)
	{
		home_motion = "";
	}
	(void) strcpy(home, home_motion);
	/* (lower_left is set in get_screensize) */

	/* 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 */
#ifdef SGTTY
	if (ioctl(STDOUT, TIOCGETP, &old_settings) == -1)
	{
		smart_terminal = No;
	}
#endif
#ifdef TERMIO
	if (ioctl(STDOUT, TCGETA, &old_settings) == -1)
	{
		smart_terminal = No;
	}
#endif
#ifdef TERMIOS
	if (tcgetattr(STDOUT, &old_settings) == -1)
	{
		smart_terminal = No;
	}
#endif
}

void
init_screen()

{
	/* get the old settings for safe keeping */
#ifdef SGTTY
	if (ioctl(STDOUT, TIOCGETP, &old_settings) != -1)
	{
		/* copy the settings so we can modify them */
		new_settings = old_settings;

		/* turn on CBREAK and turn off character echo and tab expansion */
		new_settings.sg_flags |= CBREAK;
		new_settings.sg_flags &= ~(ECHO | XTABS);
		(void) ioctl(STDOUT, TIOCSETP, &new_settings);

		/* remember the erase and kill characters */
		ch_erase = old_settings.sg_erase;
		ch_kill = old_settings.sg_kill;

#ifdef TOStop
		/* get the local mode word */
		(void) ioctl(STDOUT, TIOCLGET, &old_lword);

		/* modify it */
		new_lword = old_lword | LTOSTOP;
		(void) ioctl(STDOUT, TIOCLSET, &new_lword);
#endif
		/* remember that it really is a terminal */
		is_a_terminal = Yes;

		/* send the termcap initialization string */
		putcap(terminal_init);
	}
#endif
#ifdef TERMIO
	if (ioctl(STDOUT, TCGETA, &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 &= ~(TAB3);
		new_settings.c_cc[VMIN] = 1;
		new_settings.c_cc[VTIME] = 0;
		(void) ioctl(STDOUT, TCSETA, &new_settings);

		/* remember the erase and kill characters */
		ch_erase = old_settings.c_cc[VERASE];
		ch_kill = old_settings.c_cc[VKILL];

		/* remember that it really is a terminal */
		is_a_terminal = Yes;

		/* send the termcap initialization string */
		putcap(terminal_init);
	}
#endif
#ifdef TERMIOS
	if (tcgetattr(STDOUT, &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 &= ~(TAB3);
		new_settings.c_cc[VMIN] = 1;
		new_settings.c_cc[VTIME] = 0;
		(void) tcsetattr(STDOUT, TCSADRAIN, &new_settings);

		/* remember the erase and kill characters */
		ch_erase = old_settings.c_cc[VERASE];
		ch_kill = old_settings.c_cc[VKILL];

		/* remember that it really is a terminal */
		is_a_terminal = Yes;

		/* send the termcap initialization string */
		putcap(terminal_init);
	}
#endif

	if (!is_a_terminal)
	{
		/* not a terminal at all---consider it dumb */
		smart_terminal = No;
	}
}

void
end_screen()

{
	/* move to the lower left, clear the line and send "te" */
	if (smart_terminal)
	{
		putcap(lower_left);
		putcap(clear_line);
		fflush(stdout);
		putcap(terminal_end);
	}

	/* if we have settings to reset, then do so */
	if (is_a_terminal)
	{
#ifdef SGTTY
		(void) ioctl(STDOUT, TIOCSETP, &old_settings);
#ifdef TOStop
		(void) ioctl(STDOUT, TIOCLSET, &old_lword);
#endif
#endif
#ifdef TERMIO
		(void) ioctl(STDOUT, TCSETA, &old_settings);
#endif
#ifdef TERMIOS
		(void) tcsetattr(STDOUT, TCSADRAIN, &old_settings);
#endif
	}
}

void
reinit_screen()

{
	/* install our settings if it is a terminal */
	if (is_a_terminal)
	{
#ifdef SGTTY
		(void) ioctl(STDOUT, TIOCSETP, &new_settings);
#ifdef TOStop
		(void) ioctl(STDOUT, TIOCLSET, &new_lword);
#endif
#endif
#ifdef TERMIO
		(void) ioctl(STDOUT, TCSETA, &new_settings);
#endif
#ifdef TERMIOS
		(void) tcsetattr(STDOUT, TCSADRAIN, &new_settings);
#endif
	}

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

void
standout(char *msg)

{
	if (smart_terminal)
	{
		putcap(start_standout);
		fputs(msg, stdout);
		putcap(end_standout);
	}
	else
	{
		fputs(msg, stdout);
	}
}

void
clear()

{
	if (smart_terminal)
	{
		putcap(clear_screen);
	}
}

int
clear_eol(int len)

{
	if (smart_terminal && !overstrike && len > 0)
	{
		if (clear_line)
		{
			putcap(clear_line);
			return (0);
		}
		else
		{
			while (len-- > 0)
			{
				putchar(' ');
			}
			return (1);
		}
	}
	return (-1);
}

void
go_home()

{
	if (smart_terminal)
	{
		putcap(home);
	}
}