aboutsummaryrefslogtreecommitdiffstats
path: root/screen.c
blob: 398a85835681221a6252cd096edb11c8d2cb0338 (plain) (blame)
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
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
/*
 * Copyright (c) 1984 through 2008, William LeFebvre
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * 
 *     * 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.
 * 
 *     * Neither the name of William LeFebvre nor the names of other
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "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 COPYRIGHT
 * OWNER OR CONTRIBUTORS 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.
 */

/*
 *  Top users/processes display for Unix
 *  Version 3
 */

/*  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 "top.h"

#if HAVE_CURSES_H && HAVE_TERM_H
#include <curses.h>
#include <term.h>
#else
#if HAVE_TERMCAP_H
#include <termcap.h>
#else
#if HAVE_CURSES_H
#include <curses.h>
#endif
#endif
#endif

#if !HAVE_DECL_TPUTS
int tputs(const char *, int, int (*)(int));
#endif
#if !HAVE_DECL_TGOTO
char *tgoto(const char *, int, int);
#endif
#if !HAVE_DECL_TGETENT
int tgetent(const char *, char *);
#endif
#if !HAVE_DECL_TGETFLAG
int tgetflag(const char *);
#endif
#if !HAVE_DECL_TGETNUM
int tgetnum(const char *);
#endif
#if !HAVE_DECL_TGETSTR
char *tgetstr(const char *, char **);
#endif

#include <sys/ioctl.h>
#ifdef CBREAK
# include <sgtty.h>
# define USE_SGTTY
#else
# ifdef TCGETA
#  define USE_TERMIO
#  include <termio.h>
# else
#  define USE_TERMIOS
#  include <termios.h>
# endif
#endif
#if defined(USE_TERMIO) || defined(USE_TERMIOS)
# ifndef TAB3
#  ifdef OXTABS
#   define TAB3 OXTABS
#  else
#   define TAB3 0
#  endif
# endif
#endif

#include "screen.h"
#include "boolean.h"

#define putcap(str)     (void)((str) != NULL ? tputs(str, 1, putstdout) : 0)

extern char *myname;

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

char PC;

static int  tc_overstrike;
static char termcap_buf[1024];
static char string_buffer[1024];
static char home[15];
static char lower_left[15];
static char *tc_clear_line;
static char *tc_clear_screen;
static char *tc_clear_to_end;
static char *tc_cursor_motion;
static char *tc_start_standout;
static char *tc_end_standout;
static char *terminal_init;
static char *terminal_end;

#ifdef USE_SGTTY
static struct sgttyb old_settings;
static struct sgttyb new_settings;
#endif
#ifdef USE_TERMIO
static struct termio old_settings;
static struct termio new_settings;
#endif
#ifdef USE_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) */

static int
putstdout(TPUTS_PUTC_ARGTYPE ch)

{
    return putchar((int)ch);
}

void
screen_getsize()

{

#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 */

    (void) strcpy(lower_left, tgoto(tc_cursor_motion, 0, screen_length - 1));
}

int
screen_readtermcap(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 == No)
    {
	/* pretend we have a dumb terminal */
	smart_terminal = No;
	return No;
    }

    /* 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 No;
    }

    /* 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 No;
    }

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

    /* set up common terminal capabilities */
    if ((screen_length = tgetnum("li")) <= 0)
    {
	screen_length = smart_terminal = 0;
	return No;
    }

    /* 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 */
    tc_overstrike = tgetflag("os");

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

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

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

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

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

    /* set convenience strings */
    (void) strcpy(home, tgoto(tc_cursor_motion, 0, 0));
    /* (lower_left is set in screen_getsize) */

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

    /* if stdout is not a terminal, pretend we are a dumb terminal */
#ifdef USE_SGTTY
    if (ioctl(STDOUT, TIOCGETP, &old_settings) == -1)
    {
	smart_terminal = No;
    }
#endif
#ifdef USE_TERMIO
    if (ioctl(STDOUT, TCGETA, &old_settings) == -1)
    {
	smart_terminal = No;
    }
#endif
#ifdef USE_TERMIOS
    if (tcgetattr(STDOUT, &old_settings) == -1)
    {
	smart_terminal = No;
    }
#endif

    return smart_terminal;
}

void
screen_init()

{
    /* get the old settings for safe keeping */
#ifdef USE_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;
	ch_werase  = old_settings.sg_werase;

#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 USE_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];
	ch_werase = old_settings.c_cc[VWERASE];

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

	/* send the termcap initialization string */
	putcap(terminal_init);
    }
#endif
#ifdef USE_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];
	ch_werase = old_settings.c_cc[VWERASE];

	/* 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
screen_end()

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

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

void
screen_reinit()

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

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

void
screen_move(int x, int y)

{
    tputs(tgoto(tc_cursor_motion, x, y), 1, putstdout);
}

void
screen_standout(char *msg)

{
    if (smart_terminal)
    {
	putcap(tc_start_standout);
	fputs(msg, stdout);
	putcap(tc_end_standout);
    }
    else
    {
	fputs(msg, stdout);
    }
}

void
screen_clear()

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

int
screen_cte()

{
    if (smart_terminal)
    {
	if (tc_clear_to_end)
	{
	    putcap(tc_clear_to_end);
	    return(Yes);
	}
    }
    return(No);
}

void
screen_cleareol(int len)

{
    int i;

    if (smart_terminal && !tc_overstrike && len > 0)
    {
	if (tc_clear_line)
	{
	    putcap(tc_clear_line);
	    return;
	}
	else
	{
	    i = 0;
	    while (i++ < 0)
	    {
		putchar(' ');
	    }
	    i = 0;
	    while (i++ < 0)
	    {
		putchar('\b');
	    }
	    return;
	}
    }
    return;
}

void
screen_home()

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