contrib/ncurses-5.4/tack/sysdep.c

   1 /*
   2 ** Copyright (C) 1991, 1997 Free Software Foundation, Inc.
   3 **
   4 ** This file is part of TACK.
   5 **
   6 ** TACK is free software; you can redistribute it and/or modify
   7 ** it under the terms of the GNU General Public License as published by
   8 ** the Free Software Foundation; either version 2, or (at your option)
   9 ** any later version.
  10 **
  11 ** TACK is distributed in the hope that it will be useful,
  12 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 ** GNU General Public License for more details.
  15 **
  16 ** You should have received a copy of the GNU General Public License
  17 ** along with TACK; see the file COPYING.  If not, write to
  18 ** the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19 ** Boston, MA 02111-1307, USA.
  20 */
  21 /*
  22  * Operating system dependent functions.  We assume the POSIX API.
  23  * Note: on strict-POSIX systems (including BSD/OS) the select_delay_type
  24  * global has no effect.
  25  */
  26
  27 #include <signal.h>     /* include before curses.h to work around glibc bug */
  28
  29 #include <tack.h>
  30
  31 #include <term.h>
  32 #include <errno.h>
  33
  34 #if defined(__BEOS__)
  35 #undef false
  36 #undef true
  37 #include <OS.h>
  38 #endif
  39
  40 #if HAVE_SELECT
  41 #if HAVE_SYS_TIME_H && HAVE_SYS_TIME_SELECT
  42 #include <sys/time.h>
  43 #endif
  44 #if HAVE_SYS_SELECT_H
  45 #include <sys/select.h>
  46 #endif
  47 #endif
  48
  49 MODULE_ID("$Id: sysdep.c,v 1.11 2002/04/21 19:40:43 tom Exp $")
  50
  51 #if DECL_ERRNO
  52 extern int errno;
  53 #endif
  54
  55 #ifdef TERMIOS
  56 #define PUT_TTY(fd, buf) tcsetattr(fd, TCSAFLUSH, buf)
  57 #else
  58 #define PUT_TTY(fd, buf) stty(fd, buf)
  59 #endif
  60
  61 /* globals */
  62 int tty_frame_size;             /* asynch frame size times 2 */
  63 unsigned long tty_baud_rate;    /* baud rate - bits per second */
  64 int not_a_tty;                  /* TRUE if output is not a tty (i.e. pipe) */
  65 int nodelay_read;               /* TRUE if NDELAY is set */
  66
  67 #ifdef TERMIOS
  68 #define TTY_IS_NOECHO   !(new_modes.c_lflag & ECHO)
  69 #define TTY_IS_OUT_TRANS (new_modes.c_oflag & OPOST)
  70 #define TTY_IS_CHAR_MODE !(new_modes.c_lflag & ICANON)
  71 #define TTY_WAS_CS8 ((old_modes.c_cflag & CSIZE) == CS8)
  72 #define TTY_WAS_XON_XOFF (old_modes.c_iflag & (IXON|IXOFF))
  73 #else
  74 #define TTY_IS_NOECHO   !(new_modes.sg_flags & (ECHO))
  75 #define TTY_IS_OUT_TRANS (new_modes.sg_flags & (CRMOD))
  76 #define TTY_IS_CHAR_MODE (new_modes.sg_flags & (RAW|CBREAK))
  77 #define TTY_WAS_CS8      (old_modes.sg_flags & (PASS8))
  78 #define TTY_WAS_XON_XOFF (old_modes.sg_flags & (TANDEM|MDMBUF|DECCTQ))
  79 #endif
  80
  81 static TTY old_modes, new_modes;
  82
  83 void catchsig(void);
  84
  85 /*
  86  * These are a sneaky way of conditionalizing bit unsets so strict-POSIX
  87  * systems won't see them.
  88  */
  89 #ifndef XCASE
  90 #define XCASE   0
  91 #endif
  92 #ifndef OLCUC
  93 #define OLCUC   0
  94 #endif
  95 #ifndef IUCLC
  96 #define IUCLC   0
  97 #endif
  98 #ifndef TABDLY
  99 #define TABDLY  0
 100 #endif
 101 #ifndef IXANY
 102 #define IXANY   0
 103 #endif
 104
 105 void
 106 tty_raw(int minch GCC_UNUSED, int mask)
 107 {                               /* set tty to raw noecho */
 108         new_modes = old_modes;
 109 #ifdef TERMIOS
 110 #if HAVE_SELECT
 111         new_modes.c_cc[VMIN] = 1;
 112 #else
 113         new_modes.c_cc[VMIN] = minch;
 114 #endif
 115         new_modes.c_cc[VTIME] = 2;
 116         new_modes.c_lflag &=
 117                 ~(ISIG | ICANON | XCASE | ECHO | ECHOE | ECHOK | ECHONL);
 118 #ifdef LOBLK
 119         new_modes.c_lflag &= ~LOBLK;
 120 #endif
 121         new_modes.c_oflag &= ~(OPOST | OLCUC | TABDLY);
 122         if (mask == ALLOW_PARITY) {
 123                 new_modes.c_cflag &= ~(CSIZE | PARENB | HUPCL);
 124                 new_modes.c_cflag |= CS8;
 125         }
 126         new_modes.c_iflag &=
 127                 ~(IGNBRK | BRKINT | IGNPAR | PARMRK | INPCK | ISTRIP | INLCR | IGNCR | ICRNL |
 128                 IUCLC | IXON | IXANY | IXOFF);
 129 #else
 130         new_modes.sg_flags |= RAW;
 131 #endif
 132         if (not_a_tty)
 133                 return;
 134         PUT_TTY(fileno(stdin), &new_modes);
 135 }
 136
 137 void
 138 tty_set(void)
 139 {                               /* set tty to special modes */
 140         new_modes = old_modes;
 141 #ifdef TERMIOS
 142         new_modes.c_cc[VMIN] = 1;
 143         new_modes.c_cc[VTIME] = 1;
 144         new_modes.c_lflag &= ~(ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHONL);
 145 #if defined(ONLCR) && defined(OCRNL) && defined(ONLRET) && defined(OFILL)
 146         new_modes.c_oflag &= ~(ONLCR | OCRNL | ONLRET | OFILL);
 147 #else
 148         new_modes.c_oflag &= ~(OPOST);
 149 #endif
 150         if (char_mask == ALLOW_PARITY)
 151                 new_modes.c_iflag &= ~ISTRIP;
 152         switch (select_xon_xoff) {
 153         case 0:
 154                 new_modes.c_iflag &= ~(IXON | IXOFF);
 155                 break;
 156         case 1:
 157 #if defined(sequent) && sequent
 158                 /* the sequent System V emulation is broken */
 159                 new_modes = old_modes;
 160                 new_modes.c_cc[VEOL] = 6;       /* control F  (ACK) */
 161 #endif
 162                 new_modes.c_iflag |= IXON | IXOFF;
 163                 break;
 164         }
 165         switch (select_delay_type) {
 166         case 0:
 167 #ifdef NLDLY
 168                 new_modes.c_oflag &=
 169                         ~(NLDLY | CRDLY | TABDLY | BSDLY | VTDLY | FFDLY);
 170 #endif  /* NLDLY */
 171                 break;
 172         case 1:
 173 #ifdef NLDLY
 174                 new_modes.c_oflag &=
 175                         ~(NLDLY | CRDLY | TABDLY | BSDLY | VTDLY | FFDLY);
 176 #endif  /* NLDLY */
 177 #ifdef NL1
 178                 new_modes.c_oflag |= NL1 | CR2;
 179 #endif  /* NL1 */
 180                 break;
 181         }
 182         if (!(new_modes.c_oflag & ~OPOST))
 183                 new_modes.c_oflag &= ~OPOST;
 184 #else
 185         new_modes.sg_flags |= RAW;
 186         if (not_a_tty)
 187                 return;
 188 #endif
 189         PUT_TTY(fileno(stdin), &new_modes);
 190 }
 191
 192
 193 void
 194 tty_reset(void)
 195 {                               /* reset the tty to the original modes */
 196         fflush(stdout);
 197         if (not_a_tty)
 198                 return;
 199         PUT_TTY(fileno(stdin), &old_modes);
 200 }
 201
 202
 203 void
 204 tty_init(void)
 205 {                               /* ATT terminal init */
 206 #if defined(F_GETFL) && defined(O_NDELAY)
 207         int flags;
 208
 209         flags = fcntl(fileno(stdin), F_GETFL, 0);
 210         nodelay_read = flags & O_NDELAY;
 211 #else
 212         nodelay_read = FALSE;
 213 #endif
 214         not_a_tty = FALSE;
 215         if (GET_TTY(fileno(stdin), &old_modes) == -1) {
 216                 if (errno == ENOTTY) {
 217                         tty_frame_size = 20;
 218                         not_a_tty = TRUE;
 219                         return;
 220                 }
 221                 printf("tcgetattr error: %d\n", errno);
 222                 exit(1);
 223         }
 224         /* if TAB3 is set then setterm() wipes out tabs (ht) */
 225         new_modes = old_modes;
 226 #ifdef TERMIOS
 227 #ifdef TABDLY
 228         new_modes.c_oflag &= ~TABDLY;
 229 #endif  /* TABDLY */
 230 #endif
 231         if (PUT_TTY(fileno(stdin), &new_modes) == -1) {
 232                 printf("tcsetattr error: %d\n", errno);
 233                 exit(1);
 234         }
 235 #ifdef sequent
 236         /* the sequent ATT emulation is broken soooo. */
 237         old_modes.c_cflag &= ~(CSIZE | CSTOPB);
 238         old_modes.c_cflag |= CS7 | PARENB;
 239 #endif
 240         catchsig();
 241 #ifdef TERMIOS
 242         switch (old_modes.c_cflag & CSIZE) {
 243 #if defined(CS5) && (CS5 != 0)
 244         case CS5:
 245                 tty_frame_size = 10;
 246                 break;
 247 #endif
 248 #if defined(CS6) && (CS6 != 0)
 249         case CS6:
 250                 tty_frame_size = 12;
 251                 break;
 252 #endif
 253 #if defined(CS7) && (CS7 != 0)
 254         case CS7:
 255                 tty_frame_size = 14;
 256                 break;
 257 #endif
 258 #if defined(CS8) && (CS8 != 0)
 259         case CS8:
 260                 tty_frame_size = 16;
 261                 break;
 262 #endif
 263         }
 264         tty_frame_size += 2 +
 265                 ((old_modes.c_cflag & PARENB) ? 2 : 0) +
 266                 ((old_modes.c_cflag & CSTOPB) ? 4 : 2);
 267 #else
 268         tty_frame_size = 6 +
 269                 (old_modes.sg_flags & PASS8) ? 16 : 14;
 270 #endif
 271 }
 272
 273 /*
 274 **      stty_query(question)
 275 **
 276 **      Does the current driver settings have this property?
 277 */
 278 int
 279 stty_query(int q)
 280 {
 281         switch (q) {
 282                 case TTY_NOECHO:
 283                 return TTY_IS_NOECHO;
 284         case TTY_OUT_TRANS:
 285                 return TTY_IS_OUT_TRANS;
 286         case TTY_CHAR_MODE:
 287                 return TTY_IS_CHAR_MODE;
 288         }
 289         return (-1);
 290 }
 291
 292 /*
 293 **      initial_stty_query(question)
 294 **
 295 **      Did the initial driver settings have this property?
 296 */
 297 int
 298 initial_stty_query(int q)
 299 {
 300         switch (q) {
 301         case TTY_8_BIT:
 302                 return TTY_WAS_CS8;
 303         case TTY_XON_XOFF:
 304                 return TTY_WAS_XON_XOFF;
 305         }
 306         return (-1);
 307 }
 308
 309 #if HAVE_SELECT && defined(FD_ZERO)
 310 static int
 311 char_ready(void)
 312 {
 313         int n;
 314         fd_set ifds;
 315         struct timeval tv;
 316
 317         FD_ZERO(&ifds);
 318         FD_SET(fileno(stdin), &ifds);
 319         tv.tv_sec = 0;
 320         tv.tv_usec = 200000;
 321         n = select(fileno(stdin)+1, &ifds, NULL, NULL, &tv);
 322         return (n != 0);
 323 }
 324
 325 #else
 326 #ifdef FIONREAD
 327 int
 328 char_ready(void)
 329 {
 330         int i, j;
 331
 332         /* the following loop has to be tuned for each computer */
 333         for (j = 0; j < 1000; j++) {
 334                 ioctl(fileno(stdin), FIONREAD, &i);
 335                 if (i)
 336                         return i;
 337         }
 338         return i;
 339 }
 340
 341 #else
 342 #if defined(__BEOS__)
 343 int
 344 char_ready(void)
 345 {
 346         int n = 0;
 347         int howmany = ioctl(0, 'ichr', &n);
 348         return (howmany >= 0 && n > 0);
 349 }
 350 #else
 351 #define char_ready() 1
 352 #endif
 353 #endif
 354 #endif
 355
 356 /*
 357 **      spin_flush()
 358 **
 359 **      Wait for the input stream to stop.
 360 **      Throw away all input characters.
 361 */
 362 void
 363 spin_flush(void)
 364 {
 365         unsigned char buf[64];
 366
 367         fflush(stdout);
 368         event_start(TIME_FLUSH);        /* start the timer */
 369         do {
 370                 if (char_ready()) {
 371                         (void) read(fileno(stdin), &buf, sizeof(buf));
 372                 }
 373         } while (event_time(TIME_FLUSH) < 400000);
 374 }
 375
 376 /*
 377 **      read_key(input-buffer, length-of-buffer)
 378 **
 379 **      read one function key from the input stream.
 380 **      A null character is converted to 0x80.
 381 */
 382 void
 383 read_key(char *buf, int max)
 384 {
 385         int got, ask, i, l;
 386         char *s;
 387
 388         *buf = '\0';
 389         s = buf;
 390         fflush(stdout);
 391         /* ATT unix may return 0 or 1, Berkeley Unix should be 1 */
 392         while (read(fileno(stdin), s, 1) == 0);
 393         ++s;
 394         --max;
 395         while (max > 0 && (ask = char_ready())) {
 396                 if (ask > max) {
 397                         ask = max;
 398                 }
 399                 if ((got = read(fileno(stdin), s, ask))) {
 400                         s += got;
 401                 } else {
 402                         break;
 403                 }
 404                 max -= got;
 405         }
 406         *s = '\0';
 407         l = s - buf;
 408         for (s = buf, i = 0; i < l; i++) {
 409                 if ((*s & 0x7f) == 0) {
 410                         /* convert nulls to 0x80 */
 411                         *(unsigned char *)s = 128;
 412                 } else {
 413                         /* strip high order bits (if any) */
 414                         *s &= char_mask;
 415                 }
 416         }
 417 }
 418
 419
 420 void
 421 ignoresig(void)
 422 {
 423         /* ignore signals */
 424         signal(SIGINT, SIG_IGN);
 425         signal(SIGHUP, SIG_IGN);
 426         signal(SIGQUIT, SIG_IGN);
 427         signal(SIGTERM, SIG_IGN);
 428         signal(SIGALRM, SIG_IGN);
 429 }
 430
 431  /*
 432     onintr( )
 433
 434  is the interrupt handling routine onintr turns off interrupts while doing
 435     clean-up
 436
 437  onintr always exits fatally
 438  */
 439
 440
 441 static RETSIGTYPE
 442 onintr(int sig GCC_UNUSED)
 443 {
 444         ignoresig();
 445         tty_reset();
 446         exit(1);
 447 }
 448
 449
 450  /*
 451     catchsig( )
 452
 453  set up to field interrupts (via function onintr( )) so that if interrupted
 454     we can restore the correct terminal modes
 455
 456  catchsig simply returns
 457  */
 458
 459
 460 void
 461 catchsig(void)
 462 {
 463         if ((signal(SIGINT, SIG_IGN)) == SIG_DFL)
 464                 signal(SIGINT, onintr);
 465
 466         if ((signal(SIGHUP, SIG_IGN)) == SIG_DFL)
 467                 signal(SIGHUP, onintr);
 468
 469         if ((signal(SIGQUIT, SIG_IGN)) == SIG_DFL)
 470                 signal(SIGQUIT, onintr);
 471
 472         if ((signal(SIGTERM, SIG_IGN)) == SIG_DFL)
 473                 signal(SIGTERM, onintr);
 474
 475 }
 476
 477 /*
 478 **      alarm_event(sig)
 479 **
 480 **      Come here for an alarm event
 481 */
 482 static void
 483 alarm_event(
 484         int sig GCC_UNUSED)
 485 {
 486         no_alarm_event = 0;
 487 }
 488
 489 /*
 490 **      set_alarm_clock(seconds)
 491 **
 492 **      Set the alarm clock to fire in <seconds>
 493 */
 494 void
 495 set_alarm_clock(
 496         int seconds)
 497 {
 498         signal(SIGALRM, alarm_event);
 499         no_alarm_event = 1;
 500         (void) alarm(seconds);
 501 }