File: slutty.c

package info (click to toggle)
mc 1:4.6.0-4.6.1-pre3-3sarge1
  • links: PTS
  • area: main
  • in suites: sarge
  • size: 15,224 kB
  • ctags: 11,992
  • sloc: ansic: 93,654; sh: 5,102; perl: 1,961; makefile: 1,107; yacc: 316; cs: 43; sed: 16
file content (604 lines) | stat: -rw-r--r-- 11,357 bytes parent folder | download | duplicates (2)
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
592
593
594
595
596
597
598
599
600
601
602
603
604
/* slutty.c --- Unix Low level terminal (tty) functions for S-Lang */
/* Copyright (c) 1992, 1999, 2001, 2002, 2003 John E. Davis
 * This file is part of the S-Lang library.
 *
 * You may distribute under the terms of either the GNU General Public
 * License or the Perl Artistic License.
 */

#include "slinclud.h"

#include <signal.h>
/* sequent support thanks to Kenneth Lorber <keni@oasys.dt.navy.mil> */
/* SYSV (SYSV ISC R3.2 v3.0) provided by iain.lea@erlm.siemens.de */

#if defined (_AIX) && !defined (_ALL_SOURCE)
# define _ALL_SOURCE	/* so NBBY is defined in <sys/types.h> */
#endif

#include <sys/time.h>
#include <sys/types.h>

#ifdef SYSV
# include <fcntl.h>
# ifndef CRAY
#  include <sys/termio.h>
#  include <sys/stream.h>
#  include <sys/ptem.h>
#  include <sys/tty.h>
# endif
#endif

#ifdef __BEOS__
/* Prototype for select */
# include <net/socket.h>
#endif

#include <sys/file.h>

#ifndef sun
# include <sys/ioctl.h>
#endif

#ifdef __QNX__
# include <sys/select.h>
#endif

#include <sys/stat.h>
#include <errno.h>

#if defined (_AIX) && !defined (FD_SET)
# include <sys/select.h>	/* for FD_ISSET, FD_SET, FD_ZERO */
#endif

#ifndef O_RDWR
# include <fcntl.h>
#endif

#include "slang.h"
#include "_slang.h"

int SLang_TT_Read_FD = -1;
int SLang_TT_Baud_Rate;

#ifdef HAVE_TERMIOS_H
# if !defined(HAVE_TCGETATTR) || !defined(HAVE_TCSETATTR)
#   undef HAVE_TERMIOS_H
# endif
#endif

#ifndef HAVE_TERMIOS_H

# if !defined(CBREAK) && defined(sun)
#  ifndef BSD_COMP
#   define BSD_COMP 1
#  endif
#  include <sys/ioctl.h>
# endif

typedef struct
  {
      struct tchars t;
      struct ltchars lt;
      struct sgttyb s;
  }
TTY_Termio_Type;
#else
# include <termios.h>
typedef struct termios TTY_Termio_Type;
#endif

static TTY_Termio_Type Old_TTY;

#ifdef HAVE_TERMIOS_H
typedef const struct
{
   unsigned int key;
   unsigned int value;
} Baud_Rate_Type;

static Baud_Rate_Type Baud_Rates [] =
{
#ifdef B0
     {B0, 0},
#endif
#ifdef B50
     {B50, 50},
#endif
#ifdef B75
     {B75, 75},
#endif
#ifdef B110
     {B110, 110},
#endif
#ifdef B134
     {B134, 134},
#endif
#ifdef B150
     {B150, 150},
#endif
#ifdef B200
     {B200, 200},
#endif
#ifdef B300
     {B300, 300},
#endif
#ifdef B600
     {B600, 600},
#endif
#ifdef B1200
     {B1200, 1200},
#endif
#ifdef B1800
     {B1800, 1800},
#endif
#ifdef B2400
     {B2400, 2400},
#endif
#ifdef B4800
     {B4800, 4800},
#endif
#ifdef B9600
     {B9600, 9600},
#endif
#ifdef B19200
     {B19200, 19200},
#endif
#ifdef B38400
     {B38400, 38400},
#endif
#ifdef B57600
     {B57600, 57600},
#endif
#ifdef B115200
     {B115200, 115200},
#endif
#ifdef B230400
     {B230400, 230400},
#endif
     {0, 0}
};

static void
set_baud_rate (TTY_Termio_Type *tty)
{
#ifdef HAVE_CFGETOSPEED
   unsigned int speed;
   Baud_Rate_Type *b, *bmax;

   if (SLang_TT_Baud_Rate)
     return;			       /* already set */

   speed = (unsigned int) cfgetospeed (tty);

   b = Baud_Rates;
   bmax = b + (sizeof (Baud_Rates)/sizeof(Baud_Rates[0]));
   while (b < bmax)
     {
	if (b->key == speed)
	  {
	     SLang_TT_Baud_Rate = b->value;
	     return;
	  }
	b++;
     }
#else
   (void) tty;
#endif
}

#endif				       /* HAVE_TERMIOS_H */

#ifdef HAVE_TERMIOS_H
# define GET_TERMIOS(fd, x) tcgetattr(fd, x)
# define SET_TERMIOS(fd, x) tcsetattr(fd, TCSADRAIN, x)
#else
# ifdef TCGETS
#  define GET_TERMIOS(fd, x) ioctl(fd, TCGETS, x)
#  define SET_TERMIOS(fd, x) ioctl(fd, TCSETS, x)
# else
#  define X(x,m)  &(((TTY_Termio_Type *)(x))->m)
#  define GET_TERMIOS(fd, x)	\
    ((ioctl(fd, TIOCGETC, X(x,t)) || \
      ioctl(fd, TIOCGLTC, X(x,lt)) || \
      ioctl(fd, TIOCGETP, X(x,s))) ? -1 : 0)
#  define SET_TERMIOS(fd, x)	\
    ((ioctl(fd, TIOCSETC, X(x,t)) ||\
      ioctl(fd, TIOCSLTC, X(x,lt)) || \
      ioctl(fd, TIOCSETP, X(x,s))) ? -1 : 0)
# endif
#endif

static int TTY_Inited = 0;
static int TTY_Open = 0;

#ifdef ultrix   /* Ultrix gets _POSIX_VDISABLE wrong! */
# define NULL_VALUE -1
#else
# ifdef _POSIX_VDISABLE
#  define NULL_VALUE _POSIX_VDISABLE
# else
#  define NULL_VALUE 255
# endif
#endif

int SLang_init_tty (int abort_char, int no_flow_control, int opost)
{
   TTY_Termio_Type newtty;

   SLsig_block_signals ();

   if (TTY_Inited)
     {
	SLsig_unblock_signals ();
	return 0;
     }

   TTY_Open = 0;

   if ((SLang_TT_Read_FD == -1)
       || (1 != isatty (SLang_TT_Read_FD)))
     {
#ifdef O_RDWR
# if !defined(__BEOS__) && !defined(__APPLE__)
	/* I have been told that BEOS will HANG if passed /dev/tty */
	if ((SLang_TT_Read_FD = open("/dev/tty", O_RDWR)) >= 0)
	  {
	     TTY_Open = 1;
	  }
# endif
#endif
	if (TTY_Open == 0)
	  {
	     SLang_TT_Read_FD = fileno (stderr);
	     if (1 != isatty (SLang_TT_Read_FD))
	       {
		  SLang_TT_Read_FD = fileno (stdin);
		  if (1 != isatty (SLang_TT_Read_FD))
		    {
		       fprintf (stderr, "Failed to open terminal.");
		       return -1;
		    }
	       }
	  }
     }

   SLang_Abort_Char = abort_char;

   /* Some systems may not permit signals to be blocked.  As a result, the
    * return code must be checked.
    */
   while (-1 == GET_TERMIOS(SLang_TT_Read_FD, &Old_TTY))
     {
	if (errno != EINTR)
	  {
	     SLsig_unblock_signals ();
	     return -1;
	  }
     }

   while (-1 == GET_TERMIOS(SLang_TT_Read_FD, &newtty))
     {
	if (errno != EINTR)
	  {
	     SLsig_unblock_signals ();
	     return -1;
	  }
     }

#ifndef HAVE_TERMIOS_H
   (void) opost;
   (void) no_flow_control;
   newtty.s.sg_flags &= ~(ECHO);
   newtty.s.sg_flags &= ~(CRMOD);
   /*   if (Flow_Control == 0) newtty.s.sg_flags &= ~IXON; */
   newtty.t.t_eofc = 1;
   if (abort_char == -1) SLang_Abort_Char = newtty.t.t_intrc;
   newtty.t.t_intrc = SLang_Abort_Char;	/* ^G */
   newtty.t.t_quitc = 255;
   newtty.lt.t_suspc = 255;   /* to ignore ^Z */
   newtty.lt.t_dsuspc = 255;    /* to ignore ^Y */
   newtty.lt.t_lnextc = 255;
   newtty.s.sg_flags |= CBREAK;		/* do I want cbreak or raw????? */
#else

   /* get baud rate */

   newtty.c_iflag &= ~(ECHO | INLCR | ICRNL);
#ifdef ISTRIP
   /* newtty.c_iflag &= ~ISTRIP; */
#endif
   if (opost == 0) newtty.c_oflag &= ~OPOST;

   set_baud_rate (&newtty);

   if (no_flow_control) newtty.c_iflag &= ~IXON; else newtty.c_iflag |= IXON;

   newtty.c_cc[VEOF] = 1;
   newtty.c_cc[VMIN] = 1;
   newtty.c_cc[VTIME] = 0;
   newtty.c_lflag = ISIG | NOFLSH;
   if (abort_char == -1) SLang_Abort_Char = newtty.c_cc[VINTR];
   newtty.c_cc[VINTR] = SLang_Abort_Char;   /* ^G */
   newtty.c_cc[VQUIT] = NULL_VALUE;
   newtty.c_cc[VSUSP] = NULL_VALUE;   /* to ignore ^Z */
#ifdef VDSUSP
   newtty.c_cc[VDSUSP] = NULL_VALUE;   /* to ignore ^Y */
#endif
#ifdef VLNEXT
   newtty.c_cc[VLNEXT] = NULL_VALUE;   /* to ignore ^V ? */
#endif
#ifdef VSWTCH
   newtty.c_cc[VSWTCH] = NULL_VALUE;   /* to ignore who knows what */
#endif
#endif /* NOT HAVE_TERMIOS_H */

   while (-1 == SET_TERMIOS(SLang_TT_Read_FD, &newtty))
     {
	if (errno != EINTR)
	  {
	     SLsig_unblock_signals ();
	     return -1;
	  }
     }

   TTY_Inited = 1;
   SLsig_unblock_signals ();
   return 0;
}

void SLtty_set_suspend_state (int mode)
{
   TTY_Termio_Type newtty;

   SLsig_block_signals ();

   if (TTY_Inited == 0)
     {
	SLsig_unblock_signals ();
	return;
     }

   while ((-1 == GET_TERMIOS (SLang_TT_Read_FD, &newtty))
	  && (errno == EINTR))
     ;

#ifndef HAVE_TERMIOS_H
   /* I do not know if all systems define the t_dsuspc field */
   if (mode == 0)
     {
	newtty.lt.t_suspc = 255;
	newtty.lt.t_dsuspc = 255;
     }
   else
     {
	newtty.lt.t_suspc = Old_TTY.lt.t_suspc;
	newtty.lt.t_dsuspc = Old_TTY.lt.t_dsuspc;
     }
#else
   if (mode == 0)
     {
	newtty.c_cc[VSUSP] = NULL_VALUE;
#ifdef VDSUSP
	newtty.c_cc[VDSUSP] = NULL_VALUE;
#endif
     }
   else
     {
	newtty.c_cc[VSUSP] = Old_TTY.c_cc[VSUSP];
#ifdef VDSUSP
	newtty.c_cc[VDSUSP] = Old_TTY.c_cc[VDSUSP];
#endif
     }
#endif

   while ((-1 == SET_TERMIOS (SLang_TT_Read_FD, &newtty))
	  && (errno == EINTR))
     ;

   SLsig_unblock_signals ();
}

void SLang_reset_tty (void)
{
   SLsig_block_signals ();

   if (TTY_Inited == 0)
     {
	SLsig_unblock_signals ();
	return;
     }

   while ((-1 == SET_TERMIOS(SLang_TT_Read_FD, &Old_TTY))
	  && (errno == EINTR))
     ;

   if (TTY_Open)
     {
	while ((-1 == close (SLang_TT_Read_FD))
	       && (errno == EINTR))
	  ;

	TTY_Open = 0;
	SLang_TT_Read_FD = -1;
     }

   TTY_Inited = 0;
   SLsig_unblock_signals ();
}

static void default_sigint (int sig)
{
   sig = errno;			       /* use parameter */

   SLKeyBoard_Quit = 1;
   if (SLang_Ignore_User_Abort == 0) SLang_Error = SL_USER_BREAK;
   SLsignal_intr (SIGINT, default_sigint);
   errno = sig;
}

int SLang_set_abort_signal (void (*hand)(int))
{
   int save_errno = errno;
   SLSig_Fun_Type *f;

   if (hand == NULL) hand = default_sigint;
   f = SLsignal_intr (SIGINT, hand);

   errno = save_errno;

   if (f == (SLSig_Fun_Type *) SIG_ERR)
     return -1;

   return 0;
}

#ifndef FD_SET
#define FD_SET(fd, tthis) *(tthis) = 1 << (fd)
#define FD_ZERO(tthis)    *(tthis) = 0
#define FD_ISSET(fd, tthis) (*(tthis) & (1 << fd))
typedef int fd_set;
#endif

static fd_set Read_FD_Set;

/* HACK: If > 0, use 1/10 seconds.  If < 0, use 1/1000 seconds */

int _SLsys_input_pending(int tsecs)
{
   struct timeval wait;
   long usecs, secs;

   if ((TTY_Inited == 0)
       || (SLang_TT_Read_FD < 0))
     {
	errno = EBADF;
	return -1;
     }

   if (tsecs >= 0)
     {
	secs = tsecs / 10;
	usecs = (tsecs % 10) * 100000;
     }
   else
     {
	tsecs = -tsecs;
	secs = tsecs / 1000;
	usecs = (tsecs % 1000) * 1000;
     }

   wait.tv_sec = secs;
   wait.tv_usec = usecs;

   FD_ZERO(&Read_FD_Set);
   FD_SET(SLang_TT_Read_FD, &Read_FD_Set);

   return select(SLang_TT_Read_FD + 1, &Read_FD_Set, NULL, NULL, &wait);
}

int (*SLang_getkey_intr_hook) (void);

static int handle_interrupt (void)
{
   if (SLang_getkey_intr_hook != NULL)
     {
	int save_tty_fd = SLang_TT_Read_FD;

	if (-1 == (*SLang_getkey_intr_hook) ())
	  return -1;

	if (save_tty_fd != SLang_TT_Read_FD)
	  return -1;
     }

   return 0;
}

unsigned int _SLsys_getkey (void)
{
   unsigned char c;

   if (TTY_Inited == 0)
     {
	int ic = fgetc (stdin);
	if (ic == EOF) return SLANG_GETKEY_ERROR;
	return (unsigned int) ic;
     }

   while (1)
     {
	int ret;

	if (SLKeyBoard_Quit)
	  return SLang_Abort_Char;

	if (0 == (ret = _SLsys_input_pending (100)))
	  continue;

	if (ret != -1)
	  break;

	if (SLKeyBoard_Quit)
	  return SLang_Abort_Char;

	if (errno == EINTR)
	  {
	     if (-1 == handle_interrupt ())
	       return SLANG_GETKEY_ERROR;

	     continue;
	  }

	break;			       /* let read handle it */
     }

   while (1)
     {
	int status = read(SLang_TT_Read_FD, (char *) &c, 1);

	if (status > 0)
	  break;

	if (status == 0)
	  {
	     /* We are at the end of a file.  Let application handle it. */
	     return SLANG_GETKEY_ERROR;
	  }

	if (errno == EINTR)
	  {
	     if (-1 == handle_interrupt ())
	       return SLANG_GETKEY_ERROR;

	     if (SLKeyBoard_Quit)
	       return SLang_Abort_Char;

	     continue;
	  }
#ifdef EAGAIN
	if (errno == EAGAIN)
	  {
	     sleep (1);
	     continue;
	  }
#endif
#ifdef EWOULDBLOCK
	if (errno == EWOULDBLOCK)
	  {
	     sleep (1);
	     continue;
	  }
#endif
#ifdef EIO
	if (errno == EIO)
	  {
	     SLang_exit_error ("_SLsys_getkey: EIO error.");
	  }
#endif
	return SLANG_GETKEY_ERROR;
     }

   return((unsigned int) c);
}