src/stty.c

   1 /* stty -- change and print terminal line settings
   2    Copyright (C) 90, 91, 92, 93, 94, 1995 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software
  16    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  17
  18 /* Usage: stty [-ag] [--all] [--save] [setting...]
  19
  20    Options:
  21    -a, --all    Write all current settings to stdout in human-readable form.
  22    -g, --save   Write all current settings to stdout in stty-readable form.
  23
  24    If no args are given, write to stdout the baud rate and settings that
  25    have been changed from their defaults.  Mode reading and changes
  26    are done on stdin.
  27
  28    David MacKenzie <djm@gnu.ai.mit.edu> */
  29
  30 #include <config.h>
  31 #include <stdio.h>
  32 #include <sys/types.h>
  33 #include <termios.h>
  34 #ifdef GWINSZ_IN_SYS_IOCTL
  35 # include <sys/ioctl.h>
  36 #endif
  37 #ifdef WINSIZE_IN_PTEM
  38 # include <sys/stream.h>
  39 # include <sys/ptem.h>
  40 #endif
  41 #include <getopt.h>
  42 #ifdef __STDC__
  43 # include <stdarg.h>
  44 # define VA_START(args, lastarg) va_start(args, lastarg)
  45 #else
  46 # include <varargs.h>
  47 # define VA_START(args, lastarg) va_start(args)
  48 #endif
  49
  50 #include "system.h"
  51 #include "long-options.h"
  52 #include "error.h"
  53 #include "xstrtol.h"
  54
  55 #if defined(GWINSZ_BROKEN)      /* Such as for SCO UNIX 3.2.2. */
  56 # undef TIOCGWINSZ
  57 #endif
  58
  59 #ifndef _POSIX_VDISABLE
  60 # define _POSIX_VDISABLE ((unsigned char) 0)
  61 #endif
  62
  63 #define Control(c) ((c) & 0x1f)
  64 /* Canonical values for control characters. */
  65 #ifndef CINTR
  66 # define CINTR Control ('c')
  67 #endif
  68 #ifndef CQUIT
  69 # define CQUIT 28
  70 #endif
  71 #ifndef CERASE
  72 # define CERASE 127
  73 #endif
  74 #ifndef CKILL
  75 # define CKILL Control ('u')
  76 #endif
  77 #ifndef CEOF
  78 # define CEOF Control ('d')
  79 #endif
  80 #ifndef CEOL
  81 # define CEOL _POSIX_VDISABLE
  82 #endif
  83 #ifndef CSTART
  84 # define CSTART Control ('q')
  85 #endif
  86 #ifndef CSTOP
  87 # define CSTOP Control ('s')
  88 #endif
  89 #ifndef CSUSP
  90 # define CSUSP Control ('z')
  91 #endif
  92 #if defined(VEOL2) && !defined(CEOL2)
  93 # define CEOL2 _POSIX_VDISABLE
  94 #endif
  95 #if defined(VSWTCH) && !defined(CSWTCH)
  96 # define CSWTCH _POSIX_VDISABLE
  97 #endif
  98
  99 /* SunOS 5.3 loses (^Z doesn't work) if `swtch' is the same as `susp'.
 100    So the default is to disable `swtch.'  */
 101 #if defined (__sparc__) && defined (__svr4__)
 102 # undef CSWTCH
 103 # define CSWTCH _POSIX_VDISABLE
 104 #endif
 105
 106 #if defined(VWERSE) && !defined (VWERASE)       /* AIX-3.2.5 */
 107 # define VWERASE VWERSE
 108 #endif
 109 #if defined(VDSUSP) && !defined (CDSUSP)
 110 # define CDSUSP Control ('y')
 111 #endif
 112 #if !defined(VREPRINT) && defined(VRPRNT)       /* Irix 4.0.5 */
 113 # define VREPRINT VRPRNT
 114 #endif
 115 #if defined(VREPRINT) && !defined(CRPRNT)
 116 # define CRPRNT Control ('r')
 117 #endif
 118 #if defined(VWERASE) && !defined(CWERASE)
 119 # define CWERASE Control ('w')
 120 #endif
 121 #if defined(VLNEXT) && !defined(CLNEXT)
 122 # define CLNEXT Control ('v')
 123 #endif
 124 #if defined(VDISCARD) && !defined(VFLUSHO)
 125 # define VFLUSHO VDISCARD
 126 #endif
 127 #if defined(VFLUSH) && !defined(VFLUSHO)        /* Ultrix 4.2 */
 128 # define VFLUSHO VFLUSH
 129 #endif
 130 #if defined(CTLECH) && !defined(ECHOCTL)        /* Ultrix 4.3 */
 131 # define ECHOCTL CTLECH
 132 #endif
 133 #if defined(TCTLECH) && !defined(ECHOCTL)       /* Ultrix 4.2 */
 134 # define ECHOCTL TCTLECH
 135 #endif
 136 #if defined(CRTKIL) && !defined(ECHOKE)         /* Ultrix 4.2 and 4.3 */
 137 # define ECHOKE CRTKIL
 138 #endif
 139 #if defined(VFLUSHO) && !defined(CFLUSHO)
 140 # define CFLUSHO Control ('o')
 141 #endif
 142 #if defined(VSTATUS) && !defined(CSTATUS)
 143 # define CSTATUS Control ('t')
 144 #endif
 145
 146 /* Which speeds to set.  */
 147 enum speed_setting
 148   {
 149     input_speed, output_speed, both_speeds
 150   };
 151
 152 /* What to output and how.  */
 153 enum output_type
 154   {
 155     changed, all, recoverable   /* Default, -a, -g.  */
 156   };
 157
 158 /* Which member(s) of `struct termios' a mode uses.  */
 159 enum mode_type
 160   {
 161     control, input, output, local, combination
 162   };
 163
 164 /* Flags for `struct mode_info'. */
 165 #define SANE_SET 1              /* Set in `sane' mode. */
 166 #define SANE_UNSET 2            /* Unset in `sane' mode. */
 167 #define REV 4                   /* Can be turned off by prepending `-'. */
 168 #define OMIT 8                  /* Don't display value. */
 169
 170 /* Each mode.  */
 171 struct mode_info
 172   {
 173     const char *name;           /* Name given on command line.  */
 174     enum mode_type type;        /* Which structure element to change. */
 175     char flags;                 /* Setting and display options.  */
 176     unsigned long bits;         /* Bits to set for this mode.  */
 177     unsigned long mask;         /* Other bits to turn off for this mode.  */
 178   };
 179
 180 static struct mode_info mode_info[] =
 181 {
 182   {"parenb", control, REV, PARENB, 0},
 183   {"parodd", control, REV, PARODD, 0},
 184   {"cs5", control, 0, CS5, CSIZE},
 185   {"cs6", control, 0, CS6, CSIZE},
 186   {"cs7", control, 0, CS7, CSIZE},
 187   {"cs8", control, 0, CS8, CSIZE},
 188   {"hupcl", control, REV, HUPCL, 0},
 189   {"hup", control, REV | OMIT, HUPCL, 0},
 190   {"cstopb", control, REV, CSTOPB, 0},
 191   {"cread", control, SANE_SET | REV, CREAD, 0},
 192   {"clocal", control, REV, CLOCAL, 0},
 193 #ifdef CRTSCTS
 194   {"crtscts", control, REV, CRTSCTS, 0},
 195 #endif
 196
 197   {"ignbrk", input, SANE_UNSET | REV, IGNBRK, 0},
 198   {"brkint", input, SANE_SET | REV, BRKINT, 0},
 199   {"ignpar", input, REV, IGNPAR, 0},
 200   {"parmrk", input, REV, PARMRK, 0},
 201   {"inpck", input, REV, INPCK, 0},
 202   {"istrip", input, REV, ISTRIP, 0},
 203   {"inlcr", input, SANE_UNSET | REV, INLCR, 0},
 204   {"igncr", input, SANE_UNSET | REV, IGNCR, 0},
 205   {"icrnl", input, SANE_SET | REV, ICRNL, 0},
 206   {"ixon", input, REV, IXON, 0},
 207   {"ixoff", input, SANE_UNSET | REV, IXOFF, 0},
 208   {"tandem", input, REV | OMIT, IXOFF, 0},
 209 #ifdef IUCLC
 210   {"iuclc", input, SANE_UNSET | REV, IUCLC, 0},
 211 #endif
 212 #ifdef IXANY
 213   {"ixany", input, SANE_UNSET | REV, IXANY, 0},
 214 #endif
 215 #ifdef IMAXBEL
 216   {"imaxbel", input, SANE_SET | REV, IMAXBEL, 0},
 217 #endif
 218
 219   {"opost", output, SANE_SET | REV, OPOST, 0},
 220 #ifdef OLCUC
 221   {"olcuc", output, SANE_UNSET | REV, OLCUC, 0},
 222 #endif
 223 #ifdef OCRNL
 224   {"ocrnl", output, SANE_UNSET | REV, OCRNL, 0},
 225 #endif
 226 #ifdef ONLCR
 227   {"onlcr", output, SANE_SET | REV, ONLCR, 0},
 228 #endif
 229 #ifdef ONOCR
 230   {"onocr", output, SANE_UNSET | REV, ONOCR, 0},
 231 #endif
 232 #ifdef ONLRET
 233   {"onlret", output, SANE_UNSET | REV, ONLRET, 0},
 234 #endif
 235 #ifdef OFILL
 236   {"ofill", output, SANE_UNSET | REV, OFILL, 0},
 237 #endif
 238 #ifdef OFDEL
 239   {"ofdel", output, SANE_UNSET | REV, OFDEL, 0},
 240 #endif
 241 #ifdef NLDLY
 242   {"nl1", output, SANE_UNSET, NL1, NLDLY},
 243   {"nl0", output, SANE_SET, NL0, NLDLY},
 244 #endif
 245 #ifdef CRDLY
 246   {"cr3", output, SANE_UNSET, CR3, CRDLY},
 247   {"cr2", output, SANE_UNSET, CR2, CRDLY},
 248   {"cr1", output, SANE_UNSET, CR1, CRDLY},
 249   {"cr0", output, SANE_SET, CR0, CRDLY},
 250 #endif
 251 #ifdef TABDLY
 252   {"tab3", output, SANE_UNSET, TAB3, TABDLY},
 253   {"tab2", output, SANE_UNSET, TAB2, TABDLY},
 254   {"tab1", output, SANE_UNSET, TAB1, TABDLY},
 255   {"tab0", output, SANE_SET, TAB0, TABDLY},
 256 #else
 257 # ifdef OXTABS
 258   {"tab3", output, SANE_UNSET, OXTABS, 0},
 259 # endif
 260 #endif
 261 #ifdef BSDLY
 262   {"bs1", output, SANE_UNSET, BS1, BSDLY},
 263   {"bs0", output, SANE_SET, BS0, BSDLY},
 264 #endif
 265 #ifdef VTDLY
 266   {"vt1", output, SANE_UNSET, VT1, VTDLY},
 267   {"vt0", output, SANE_SET, VT0, VTDLY},
 268 #endif
 269 #ifdef FFDLY
 270   {"ff1", output, SANE_UNSET, FF1, FFDLY},
 271   {"ff0", output, SANE_SET, FF0, FFDLY},
 272 #endif
 273
 274   {"isig", local, SANE_SET | REV, ISIG, 0},
 275   {"icanon", local, SANE_SET | REV, ICANON, 0},
 276 #ifdef IEXTEN
 277   {"iexten", local, SANE_SET | REV, IEXTEN, 0},
 278 #endif
 279   {"echo", local, SANE_SET | REV, ECHO, 0},
 280   {"echoe", local, SANE_SET | REV, ECHOE, 0},
 281   {"crterase", local, REV | OMIT, ECHOE, 0},
 282   {"echok", local, SANE_SET | REV, ECHOK, 0},
 283   {"echonl", local, SANE_UNSET | REV, ECHONL, 0},
 284   {"noflsh", local, SANE_UNSET | REV, NOFLSH, 0},
 285 #ifdef XCASE
 286   {"xcase", local, SANE_UNSET | REV, XCASE, 0},
 287 #endif
 288 #ifdef TOSTOP
 289   {"tostop", local, SANE_UNSET | REV, TOSTOP, 0},
 290 #endif
 291 #ifdef ECHOPRT
 292   {"echoprt", local, SANE_UNSET | REV, ECHOPRT, 0},
 293   {"prterase", local, REV | OMIT, ECHOPRT, 0},
 294 #endif
 295 #ifdef ECHOCTL
 296   {"echoctl", local, SANE_SET | REV, ECHOCTL, 0},
 297   {"ctlecho", local, REV | OMIT, ECHOCTL, 0},
 298 #endif
 299 #ifdef ECHOKE
 300   {"echoke", local, SANE_SET | REV, ECHOKE, 0},
 301   {"crtkill", local, REV | OMIT, ECHOKE, 0},
 302 #endif
 303
 304   {"evenp", combination, REV | OMIT, 0, 0},
 305   {"parity", combination, REV | OMIT, 0, 0},
 306   {"oddp", combination, REV | OMIT, 0, 0},
 307   {"nl", combination, REV | OMIT, 0, 0},
 308   {"ek", combination, OMIT, 0, 0},
 309   {"sane", combination, OMIT, 0, 0},
 310   {"cooked", combination, REV | OMIT, 0, 0},
 311   {"raw", combination, REV | OMIT, 0, 0},
 312   {"pass8", combination, REV | OMIT, 0, 0},
 313   {"litout", combination, REV | OMIT, 0, 0},
 314   {"cbreak", combination, REV | OMIT, 0, 0},
 315 #ifdef IXANY
 316   {"decctlq", combination, REV | OMIT, 0, 0},
 317 #endif
 318 #if defined (TABDLY) || defined (OXTABS)
 319   {"tabs", combination, REV | OMIT, 0, 0},
 320 #endif
 321 #if defined(XCASE) && defined(IUCLC) && defined(OLCUC)
 322   {"lcase", combination, REV | OMIT, 0, 0},
 323   {"LCASE", combination, REV | OMIT, 0, 0},
 324 #endif
 325   {"crt", combination, OMIT, 0, 0},
 326   {"dec", combination, OMIT, 0, 0},
 327
 328   {NULL, control, 0, 0, 0}
 329 };
 330
 331 /* Control character settings.  */
 332 struct control_info
 333   {
 334     const char *name;           /* Name given on command line.  */
 335     unsigned char saneval;      /* Value to set for `stty sane'.  */
 336     int offset;                 /* Offset in c_cc.  */
 337   };
 338
 339 /* Control characters. */
 340
 341 static struct control_info control_info[] =
 342 {
 343   {"intr", CINTR, VINTR},
 344   {"quit", CQUIT, VQUIT},
 345   {"erase", CERASE, VERASE},
 346   {"kill", CKILL, VKILL},
 347   {"eof", CEOF, VEOF},
 348   {"eol", CEOL, VEOL},
 349 #ifdef VEOL2
 350   {"eol2", CEOL2, VEOL2},
 351 #endif
 352 #ifdef VSWTCH
 353   {"swtch", CSWTCH, VSWTCH},
 354 #endif
 355   {"start", CSTART, VSTART},
 356   {"stop", CSTOP, VSTOP},
 357   {"susp", CSUSP, VSUSP},
 358 #ifdef VDSUSP
 359   {"dsusp", CDSUSP, VDSUSP},
 360 #endif
 361 #ifdef VREPRINT
 362   {"rprnt", CRPRNT, VREPRINT},
 363 #endif
 364 #ifdef VWERASE
 365   {"werase", CWERASE, VWERASE},
 366 #endif
 367 #ifdef VLNEXT
 368   {"lnext", CLNEXT, VLNEXT},
 369 #endif
 370 #ifdef VFLUSHO
 371   {"flush", CFLUSHO, VFLUSHO},
 372 #endif
 373 #ifdef VSTATUS
 374   {"status", CSTATUS, VSTATUS},
 375 #endif
 376
 377   /* These must be last because of the display routines. */
 378   {"min", 1, VMIN},
 379   {"time", 0, VTIME},
 380   {NULL, 0, 0}
 381 };
 382
 383 static const char *visible __P ((unsigned int ch));
 384 static unsigned long baud_to_value __P ((speed_t speed));
 385 static int recover_mode __P ((char *arg, struct termios *mode));
 386 static int screen_columns __P ((void));
 387 static int set_mode __P ((struct mode_info *info, int reversed,
 388                           struct termios *mode));
 389 static long integer_arg __P ((const char *s));
 390 static speed_t string_to_baud __P ((const char *arg));
 391 static tcflag_t *mode_type_flag __P ((enum mode_type type,
 392                                       struct termios *mode));
 393 static void display_all __P ((struct termios *mode));
 394 static void display_changed __P ((struct termios *mode));
 395 static void display_recoverable __P ((struct termios *mode));
 396 static void display_settings __P ((enum output_type output_type,
 397                                    struct termios *mode));
 398 static void display_speed __P ((struct termios *mode, int fancy));
 399 static void display_window_size __P ((int fancy));
 400 static void sane_mode __P ((struct termios *mode));
 401 static void set_control_char __P ((struct control_info *info, const char *arg,
 402                                    struct termios *mode));
 403 static void set_speed __P ((enum speed_setting type, const char *arg,
 404                             struct termios *mode));
 405 static void set_window_size __P ((int rows, int cols));
 406
 407 /* The width of the screen, for output wrapping. */
 408 static int max_col;
 409
 410 /* Current position, to know when to wrap. */
 411 static int current_col;
 412
 413 static struct option longopts[] =
 414 {
 415   {"all", no_argument, NULL, 'a'},
 416   {"save", no_argument, NULL, 'g'},
 417   {NULL, 0, NULL, 0}
 418 };
 419
 420 /* The name this program was run with. */
 421 char *program_name;
 422
 423 /* Print format string MESSAGE and optional args.
 424    Wrap to next line first if it won't fit.
 425    Print a space first unless MESSAGE will start a new line. */
 426
 427 /* VARARGS */
 428 static void
 429 #ifdef __STDC__
 430 wrapf (const char *message,...)
 431 #else
 432  wrapf (message, va_alist)
 433      const char *message;
 434      va_dcl
 435 #endif
 436 {
 437   va_list args;
 438   char buf[1024];               /* Plenty long for our needs. */
 439   int buflen;
 440
 441   VA_START (args, message);
 442   vsprintf (buf, message, args);
 443   va_end (args);
 444   buflen = strlen (buf);
 445   if (current_col + (current_col > 0) + buflen >= max_col)
 446     {
 447       putchar ('\n');
 448       current_col = 0;
 449     }
 450   if (current_col > 0)
 451     {
 452       putchar (' ');
 453       current_col++;
 454     }
 455   fputs (buf, stdout);
 456   current_col += buflen;
 457 }
 458
 459 static void
 460 usage (int status)
 461 {
 462   if (status != 0)
 463     fprintf (stderr, _("Try `%s --help' for more information.\n"),
 464              program_name);
 465   else
 466     {
 467       printf (_("\
 468 Usage: %s [SETTING]...\n\
 469   or:  %s OPTION\n\
 470 "),
 471               program_name, program_name);
 472       printf (_("\
 473 Print or change terminal characteristics.\n\
 474 \n\
 475   -a, --all       print all current settings in human-readable form\n\
 476   -g, --save      print all current settings in a stty-readable form\n\
 477       --help      display this help and exit\n\
 478       --version   output version information and exit\n\
 479 \n\
 480 Optional - before SETTING indicates negation.  An * marks non-POSIX\n\
 481 settings.  The underlying system defines which settings are available.\n\
 482 "));
 483       printf (_("\
 484 \n\
 485 Special characters:\n\
 486 * dsusp CHAR    CHAR will send a terminal stop signal once input flushed\n\
 487   eof CHAR      CHAR will send an end of file (terminate the input)\n\
 488   eol CHAR      CHAR will end the line\n\
 489 * eol2 CHAR     alternate CHAR for ending the line\n\
 490   erase CHAR    CHAR will erase the last character typed\n\
 491   intr CHAR     CHAR will send an interrupt signal\n\
 492   kill CHAR     CHAR will erase the current line\n\
 493 * lnext CHAR    CHAR will enter the next character quoted\n\
 494   quit CHAR     CHAR will send a quit signal\n\
 495 * rprnt CHAR    CHAR will redraw the current line\n\
 496   start CHAR    CHAR will restart the output after stopping it\n\
 497   stop CHAR     CHAR will stop the output\n\
 498   susp CHAR     CHAR will send a terminal stop signal\n\
 499 * swtch CHAR    CHAR will switch to a different shell layer\n\
 500 * werase CHAR   CHAR will erase the last word typed\n\
 501 "));
 502       printf (_("\
 503 \n\
 504 Special settings:\n\
 505   N             set the input and output speeds to N bauds\n\
 506 * cols N        tell the kernel that the terminal has N columns\n\
 507 * columns N     same as cols N\n\
 508   ispeed N      set the input speed to N\n\
 509 * line N        use line discipline N\n\
 510   min N         with -icanon, set N characters minimum for a completed read\n\
 511   ospeed N      set the output speed to N\n\
 512 * rows N        tell the kernel that the terminal has N rows\n\
 513 * size          print the number of rows and columns according to the kernel\n\
 514   speed         print the terminal speed\n\
 515   time N        with -icanon, set read timeout of N tenths of a second\n\
 516 "));
 517       printf (_("\
 518 \n\
 519 Control settings:\n\
 520   [-]clocal     disable modem control signals\n\
 521   [-]cread      allow input to be received\n\
 522 * [-]crtscts    enable RTS/CTS handshaking\n\
 523   csN           set character size to N bits, N in [5..8]\n\
 524   [-]cstopb     use two stop bits per character (one with `-')\n\
 525   [-]hup        send a hangup signal when the last process closes the tty\n\
 526   [-]hupcl      same as [-]hup\n\
 527   [-]parenb     generate parity bit in output and expect parity bit in input\n\
 528   [-]parodd     set odd parity (even with `-')\n\
 529 "));
 530       printf (_("\
 531 \n\
 532 Input settings:\n\
 533   [-]brkint     breaks cause an interrupt signal\n\
 534   [-]icrnl      translate carriage return to newline\n\
 535   [-]ignbrk     ignore break characters\n\
 536   [-]igncr      ignore carriage return\n\
 537   [-]ignpar     ignore characters with parity errors\n\
 538 * [-]imaxbel    beep and do not flush a full input buffer on a character\n\
 539   [-]inlcr      translate newline to carriage return\n\
 540   [-]inpck      enable input parity checking\n\
 541   [-]istrip     clear high (8th) bit of input characters\n\
 542 * [-]iuclc      translate uppercase characters to lowercase\n\
 543 * [-]ixany      let any character restart output, not only start character\n\
 544   [-]ixoff      enable sending of start/stop characters\n\
 545   [-]ixon       enable XON/XOFF flow control\n\
 546   [-]parmrk     mark parity errors (with a 255-0-character sequence)\n\
 547   [-]tandem     same as [-]ixoff\n\
 548 "));
 549       printf (_("\
 550 \n\
 551 Output settings:\n\
 552 * bsN           backspace delay style, N in [0..1]\n\
 553 * crN           carriage return delay style, N in [0..3]\n\
 554 * ffN           form feed delay style, N in [0..1]\n\
 555 * nlN           newline delay style, N in [0..1]\n\
 556 * [-]ocrnl      translate carriage return to newline\n\
 557 * [-]ofdel      use delete characters for fill instead of null characters\n\
 558 * [-]ofill      use fill (padding) characters instead of timing for delays\n\
 559 * [-]olcuc      translate lowercase characters to uppercase\n\
 560 * [-]onlcr      translate newline to carriage return-newline\n\
 561 * [-]onlret     newline performs a carriage return\n\
 562 * [-]onocr      do not print carriage returns in the first column\n\
 563   [-]opost      postprocess output\n\
 564 * tabN          horizontal tab delay style, N in [0..3]\n\
 565 * tabs          same as tab0\n\
 566 * -tabs         same as tab3\n\
 567 * vtN           vertical tab delay style, N in [0..1]\n\
 568 "));
 569       printf (_("\
 570 \n\
 571 Local settings:\n\
 572   [-]crterase   echo erase characters as backspace-space-backspace\n\
 573 * crtkill       kill all line by obeying the echoprt and echoe settings\n\
 574 * -crtkill      kill all line by obeying the echoctl and echok settings\n\
 575 * [-]ctlecho    echo control characters in hat notation (`^c')\n\
 576   [-]echo       echo input characters\n\
 577 * [-]echoctl    same as [-]ctlecho\n\
 578   [-]echoe      same as [-]crterase\n\
 579   [-]echok      echo a newline after a kill character\n\
 580 * [-]echoke     same as [-]crtkill\n\
 581   [-]echonl     echo newline even if not echoing other characters\n\
 582 * [-]echoprt    echo erased characters backward, between `\\' and '/'\n\
 583   [-]icanon     enable erase, kill, werase, and rprnt special characters\n\
 584   [-]iexten     enable non-POSIX special characters\n\
 585   [-]isig       enable interrupt, quit, and suspend special characters\n\
 586   [-]noflsh     disable flushing after interrupt and quit special characters\n\
 587 * [-]prterase   same as [-]echoprt\n\
 588 * [-]tostop     stop background jobs that try to write to the terminal\n\
 589 * [-]xcase      with icanon, escape with `\\' for uppercase characters\n\
 590 "));
 591       printf (_("\
 592 \n\
 593 Combination settings:\n\
 594 * [-]LCASE      same as [-]lcase\n\
 595   cbreak        same as -icanon\n\
 596   -cbreak       same as icanon\n\
 597   cooked        same as brkint ignpar istrip icrnl ixon opost isig\n\
 598                 icanon, eof and eol characters to their default values\n\
 599   -cooked       same as raw\n\
 600   crt           same as echoe echoctl echoke\n\
 601   dec           same as echoe echoctl echoke -ixany intr ^c erase 0177\n\
 602                 kill ^u\n\
 603 * [-]decctlq    same as [-]ixany\n\
 604   ek            erase and kill characters to their default values\n\
 605   evenp         same as parenb -parodd cs7\n\
 606   -evenp        same as -parenb cs8\n\
 607 * [-]lcase      same as xcase iuclc olcuc\n\
 608   litout        same as -parenb -istrip -opost cs8\n\
 609   -litout       same as parenb istrip opost cs7\n\
 610   nl            same as -icrnl -onlcr\n\
 611   -nl           same as icrnl -inlcr -igncr onlcr -ocrnl -onlret\n\
 612   oddp          same as parenb parodd cs7\n\
 613   -oddp         same as -parenb cs8\n\
 614   [-]parity     same as [-]evenp\n\
 615   pass8         same as -parenb -istrip cs8\n\
 616   -pass8        same as parenb istrip cs7\n\
 617   raw           same as -ignbrk -brkint -ignpar -parmrk -inpck -istrip\n\
 618                 -inlcr -igncr -icrnl  -ixon  -ixoff  -iuclc  -ixany\n\
 619                 -imaxbel -opost -isig -icanon -xcase min 1 time 0\n\
 620   -raw          same as cooked\n\
 621   sane          same as cread -ignbrk brkint -inlcr -igncr icrnl\n\
 622                 -ixoff -iucl -ixany imaxbel opost -olcuc -ocrnl onlcr\n\
 623                 -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0\n\
 624                 isig icanon iexten echo echoe echok -echonl -noflsh\n\
 625                 -xcase -tostop -echoprt echoctl echoke, all special\n\
 626                 characters to their default values.\n\
 627 "));
 628       printf (_("\
 629 \n\
 630 Handle the tty line connected to standard input.  Without arguments,\n\
 631 prints baud rate, line discipline, and deviations from stty sane.  In\n\
 632 settings, CHAR is taken literally, or coded as in ^c, 0x37, 0177 or\n\
 633 127; special values ^- or undef used to disable special characters.\n\
 634 "));
 635     }
 636   exit (status);
 637 }
 638
 639 void
 640 main (int argc, char **argv)
 641 {
 642   struct termios mode;
 643   enum output_type output_type;
 644   int optc;
 645   int require_set_attr;
 646   int speed_was_set;
 647   int verbose_output;
 648   int recoverable_output;
 649   int k;
 650
 651   program_name = argv[0];
 652   setlocale (LC_ALL, "");
 653   bindtextdomain (PACKAGE, LOCALEDIR);
 654   textdomain (PACKAGE);
 655
 656   parse_long_options (argc, argv, "stty", PACKAGE_VERSION, usage);
 657
 658   output_type = changed;
 659   verbose_output = 0;
 660   recoverable_output = 0;
 661
 662   /* Recognize the long options only.  */
 663   opterr = 0;
 664   while ((optc = getopt_long_only (argc, argv, "ag", longopts, (int *) 0))
 665          != EOF)
 666     {
 667       switch (optc)
 668         {
 669         case 'a':
 670           verbose_output = 1;
 671           output_type = all;
 672           break;
 673
 674         case 'g':
 675           recoverable_output = 1;
 676           output_type = recoverable;
 677           break;
 678
 679         default:
 680           break;
 681         }
 682     }
 683
 684   /* Recognize short options and combinations: -a, -g, -ag, and -ga.
 685      They need not precede non-options.  We cannot use GNU getopt because
 686      it would treat -tabs and -ixany as uses of the -a option.  */
 687   for (k = optind; k < argc; k++)
 688     {
 689       if (argv[k][0] == '-')
 690         {
 691           if (argv[k][1] == 'a'
 692               && argv[k][2] == '\0')
 693             {
 694               ++optind;
 695               verbose_output = 1;
 696             }
 697           else if (argv[k][1] == 'g'
 698                    && argv[k][2] == '\0')
 699             {
 700               ++optind;
 701               recoverable_output = 1;
 702             }
 703           else if ((argv[k][1] == 'g'
 704                     && argv[k][2] == 'a'
 705                     && argv[k][3] == '\0')
 706                    || (argv[k][1] == 'a'
 707                        && argv[k][2] == 'g'
 708                        && argv[k][3] == '\0'))
 709             {
 710               ++optind;
 711               verbose_output = 1;
 712               recoverable_output = 1;
 713             }
 714         }
 715     }
 716
 717   /* Specifying both -a and -g gets an error.  */
 718   if (verbose_output && recoverable_output)
 719     error (2, 0,
 720            _("the options for verbose and stty-readable output styles are\n\
 721 \tmutually exclusive"));
 722
 723   /* Specifying any other arguments with -a or -g gets an error.  */
 724   if (argc - optind > 0 && (verbose_output || recoverable_output))
 725     error (2, 0, _("when specifying an output style, modes may not be set"));
 726
 727   /* Initialize to all zeroes so there is no risk memcmp will report a
 728      spurious difference in an uninitialized portion of the structure.  */
 729   memset (&mode, 0, sizeof (mode));
 730   if (tcgetattr (0, &mode))
 731     error (1, errno, _("standard input"));
 732
 733   if (verbose_output || recoverable_output || argc == 1)
 734     {
 735       max_col = screen_columns ();
 736       current_col = 0;
 737       display_settings (output_type, &mode);
 738       exit (0);
 739     }
 740
 741   speed_was_set = 0;
 742   require_set_attr = 0;
 743   k = 1;
 744   while (k < argc)
 745     {
 746       int match_found = 0;
 747       int reversed = 0;
 748       int i;
 749
 750       if (argv[k][0] == '-')
 751         {
 752           ++argv[k];
 753           reversed = 1;
 754         }
 755       for (i = 0; mode_info[i].name != NULL; ++i)
 756         {
 757           if (!strcmp (argv[k], mode_info[i].name))
 758             {
 759               match_found = set_mode (&mode_info[i], reversed, &mode);
 760               require_set_attr = 1;
 761               break;
 762             }
 763         }
 764       if (match_found == 0 && reversed)
 765         {
 766           error (0, 0, _("invalid argument `%s'"), --argv[k]);
 767           usage (1);
 768         }
 769       if (match_found == 0)
 770         {
 771           for (i = 0; control_info[i].name != NULL; ++i)
 772             {
 773               if (!strcmp (argv[k], control_info[i].name))
 774                 {
 775                   if (k == argc - 1)
 776                     {
 777                       error (0, 0, _("missing argument to `%s'"), argv[k]);
 778                       usage (1);
 779                     }
 780                   match_found = 1;
 781                   ++k;
 782                   set_control_char (&control_info[i], argv[k], &mode);
 783                   require_set_attr = 1;
 784                   break;
 785                 }
 786             }
 787         }
 788       if (match_found == 0)
 789         {
 790           if (!strcmp (argv[k], "ispeed"))
 791             {
 792               if (k == argc - 1)
 793                 {
 794                   error (0, 0, _("missing argument to `%s'"), argv[k]);
 795                   usage (1);
 796                 }
 797               ++k;
 798               set_speed (input_speed, argv[k], &mode);
 799               speed_was_set = 1;
 800               require_set_attr = 1;
 801             }
 802           else if (!strcmp (argv[k], "ospeed"))
 803             {
 804               if (k == argc - 1)
 805                 {
 806                   error (0, 0, _("missing argument to `%s'"), argv[k]);
 807                   usage (1);
 808                 }
 809               ++k;
 810               set_speed (output_speed, argv[k], &mode);
 811               speed_was_set = 1;
 812               require_set_attr = 1;
 813             }
 814 #ifdef TIOCGWINSZ
 815           else if (!strcmp (argv[k], "rows"))
 816             {
 817               if (k == argc - 1)
 818                 {
 819                   error (0, 0, _("missing argument to `%s'"), argv[k]);
 820                   usage (1);
 821                 }
 822               ++k;
 823               set_window_size ((int) integer_arg (argv[k]), -1);
 824             }
 825           else if (!strcmp (argv[k], "cols")
 826                    || !strcmp (argv[k], "columns"))
 827             {
 828               if (k == argc - 1)
 829                 {
 830                   error (0, 0, _("missing argument to `%s'"), argv[k]);
 831                   usage (1);
 832                 }
 833               ++k;
 834               set_window_size (-1, (int) integer_arg (argv[k]));
 835             }
 836           else if (!strcmp (argv[k], "size"))
 837             {
 838               max_col = screen_columns ();
 839               current_col = 0;
 840               display_window_size (0);
 841             }
 842 #endif
 843 #ifdef HAVE_C_LINE
 844           else if (!strcmp (argv[k], "line"))
 845             {
 846               if (k == argc - 1)
 847                 {
 848                   error (0, 0, _("missing argument to `%s'"), argv[k]);
 849                   usage (1);
 850                 }
 851               ++k;
 852               mode.c_line = integer_arg (argv[k]);
 853               require_set_attr = 1;
 854             }
 855 #endif
 856           else if (!strcmp (argv[k], "speed"))
 857             {
 858               max_col = screen_columns ();
 859               display_speed (&mode, 0);
 860             }
 861           else if (string_to_baud (argv[k]) != (speed_t) -1)
 862             {
 863               set_speed (both_speeds, argv[k], &mode);
 864               speed_was_set = 1;
 865               require_set_attr = 1;
 866             }
 867           else
 868             {
 869               if (recover_mode (argv[k], &mode) == 0)
 870                 {
 871                   error (0, 0, _("invalid argument `%s'"), argv[k]);
 872                   usage (1);
 873                 }
 874               require_set_attr = 1;
 875             }
 876         }
 877       k++;
 878     }
 879
 880   if (require_set_attr)
 881     {
 882       struct termios new_mode;
 883
 884       if (tcsetattr (0, TCSADRAIN, &mode))
 885         error (1, errno, _("standard input"));
 886
 887       /* POSIX (according to Zlotnick's book) tcsetattr returns zero if
 888          it performs *any* of the requested operations.  This means it
 889          can report `success' when it has actually failed to perform
 890          some proper subset of the requested operations.  To detect
 891          this partial failure, get the current terminal attributes and
 892          compare them to the requested ones.  */
 893
 894       /* Initialize to all zeroes so there is no risk memcmp will report a
 895          spurious difference in an uninitialized portion of the structure.  */
 896       memset (&new_mode, 0, sizeof (new_mode));
 897       if (tcgetattr (0, &new_mode))
 898         error (1, errno, _("standard input"));
 899
 900       /* Normally, one shouldn't use memcmp to compare structures that
 901          may have `holes' containing uninitialized data, but we have been
 902          careful to initialize the storage of these two variables to all
 903          zeroes.  One might think it more efficient simply to compare the
 904          modified fields, but that would require enumerating those fields --
 905          and not all systems have the same fields in this structure.  */
 906
 907       if (memcmp (&mode, &new_mode, sizeof (mode)) != 0)
 908         {
 909 #ifdef CIBAUD
 910           /* SunOS 4.1.3 (at least) has the problem that after this sequence,
 911              tcgetattr(&m1); tcsetattr(&m1); tcgetattr(&m2);
 912              sometimes (m1 != m2).  The only difference is in the four bits
 913              of the c_cflag field corresponding to the baud rate.  To save
 914              Sun users a little confusion, don't report an error if this
 915              happens.  But suppress the error only if we haven't tried to
 916              set the baud rate explicitly -- otherwise we'd never give an
 917              error for a true failure to set the baud rate.  */
 918
 919           new_mode.c_cflag &= (~CIBAUD);
 920           if (speed_was_set || memcmp (&mode, &new_mode, sizeof (mode)) != 0)
 921 #endif
 922             {
 923             int i;
 924             error (1, 0,
 925               _("standard input: unable to perform all requested operations"));
 926             printf (_("new_mode: mode\n"));
 927             for (i=0; i<sizeof(new_mode); i++)
 928               printf ("0x%02x: 0x%02x\n",
 929                       *(((unsigned char *) &new_mode) + i),
 930                       *(((unsigned char *) &mode) + i));
 931             }
 932         }
 933     }
 934
 935   exit (0);
 936 }
 937
 938 /* Return 0 if not applied because not reversible; otherwise return 1. */
 939
 940 static int
 941 set_mode (struct mode_info *info, int reversed, struct termios *mode)
 942 {
 943   tcflag_t *bitsp;
 944
 945   if (reversed && (info->flags & REV) == 0)
 946     return 0;
 947
 948   bitsp = mode_type_flag (info->type, mode);
 949
 950   if (bitsp == NULL)
 951     {
 952       /* Combination mode. */
 953       if (!strcmp (info->name, "evenp") || !strcmp (info->name, "parity"))
 954         {
 955           if (reversed)
 956             mode->c_cflag = (mode->c_cflag & ~PARENB & ~CSIZE) | CS8;
 957           else
 958             mode->c_cflag = (mode->c_cflag & ~PARODD & ~CSIZE) | PARENB | CS7;
 959         }
 960       else if (!strcmp (info->name, "oddp"))
 961         {
 962           if (reversed)
 963             mode->c_cflag = (mode->c_cflag & ~PARENB & ~CSIZE) | CS8;
 964           else
 965             mode->c_cflag = (mode->c_cflag & ~CSIZE) | CS7 | PARODD | PARENB;
 966         }
 967       else if (!strcmp (info->name, "nl"))
 968         {
 969           if (reversed)
 970             {
 971               mode->c_iflag = (mode->c_iflag | ICRNL) & ~INLCR & ~IGNCR;
 972               mode->c_oflag = (mode->c_oflag
 973 #ifdef ONLCR
 974                                | ONLCR
 975 #endif
 976                 )
 977 #ifdef OCRNL
 978                 & ~OCRNL
 979 #endif
 980 #ifdef ONLRET
 981                 & ~ONLRET
 982 #endif
 983                 ;
 984             }
 985           else
 986             {
 987               mode->c_iflag = mode->c_iflag & ~ICRNL;
 988 #ifdef ONLCR
 989               mode->c_oflag = mode->c_oflag & ~ONLCR;
 990 #endif
 991             }
 992         }
 993       else if (!strcmp (info->name, "ek"))
 994         {
 995           mode->c_cc[VERASE] = CERASE;
 996           mode->c_cc[VKILL] = CKILL;
 997         }
 998       else if (!strcmp (info->name, "sane"))
 999         sane_mode (mode);
1000       else if (!strcmp (info->name, "cbreak"))
1001         {
1002           if (reversed)
1003             mode->c_lflag |= ICANON;
1004           else
1005             mode->c_lflag &= ~ICANON;
1006         }
1007       else if (!strcmp (info->name, "pass8"))
1008         {
1009           if (reversed)
1010             {
1011               mode->c_cflag = (mode->c_cflag & ~CSIZE) | CS7 | PARENB;
1012               mode->c_iflag |= ISTRIP;
1013             }
1014           else
1015             {
1016               mode->c_cflag = (mode->c_cflag & ~PARENB & ~CSIZE) | CS8;
1017               mode->c_iflag &= ~ISTRIP;
1018             }
1019         }
1020       else if (!strcmp (info->name, "litout"))
1021         {
1022           if (reversed)
1023             {
1024               mode->c_cflag = (mode->c_cflag & ~CSIZE) | CS7 | PARENB;
1025               mode->c_iflag |= ISTRIP;
1026               mode->c_oflag |= OPOST;
1027             }
1028           else
1029             {
1030               mode->c_cflag = (mode->c_cflag & ~PARENB & ~CSIZE) | CS8;
1031               mode->c_iflag &= ~ISTRIP;
1032               mode->c_oflag &= ~OPOST;
1033             }
1034         }
1035       else if (!strcmp (info->name, "raw") || !strcmp (info->name, "cooked"))
1036         {
1037           if ((info->name[0] == 'r' && reversed)
1038               || (info->name[0] == 'c' && !reversed))
1039             {
1040               /* Cooked mode. */
1041               mode->c_iflag |= BRKINT | IGNPAR | ISTRIP | ICRNL | IXON;
1042               mode->c_oflag |= OPOST;
1043               mode->c_lflag |= ISIG | ICANON;
1044 #if VMIN == VEOF
1045               mode->c_cc[VEOF] = CEOF;
1046 #endif
1047 #if VTIME == VEOL
1048               mode->c_cc[VEOL] = CEOL;
1049 #endif
1050             }
1051           else
1052             {
1053               /* Raw mode. */
1054               mode->c_iflag = 0;
1055               mode->c_oflag &= ~OPOST;
1056               mode->c_lflag &= ~(ISIG | ICANON
1057 #ifdef XCASE
1058                                  | XCASE
1059 #endif
1060                 );
1061               mode->c_cc[VMIN] = 1;
1062               mode->c_cc[VTIME] = 0;
1063             }
1064         }
1065 #ifdef IXANY
1066       else if (!strcmp (info->name, "decctlq"))
1067         {
1068           if (reversed)
1069             mode->c_iflag |= IXANY;
1070           else
1071             mode->c_iflag &= ~IXANY;
1072         }
1073 #endif
1074 #ifdef TABDLY
1075       else if (!strcmp (info->name, "tabs"))
1076         {
1077           if (reversed)
1078             mode->c_oflag = (mode->c_oflag & ~TABDLY) | TAB3;
1079           else
1080             mode->c_oflag = (mode->c_oflag & ~TABDLY) | TAB0;
1081         }
1082 #else
1083 # ifdef OXTABS
1084       else if (!strcmp (info->name, "tabs"))
1085         {
1086           if (reversed)
1087             mode->c_oflag = mode->c_oflag | OXTABS;
1088           else
1089             mode->c_oflag = mode->c_oflag & ~OXTABS;
1090         }
1091 # endif
1092 #endif
1093 #if defined(XCASE) && defined(IUCLC) && defined(OLCUC)
1094       else if (!strcmp (info->name, "lcase")
1095                || !strcmp (info->name, "LCASE"))
1096         {
1097           if (reversed)
1098             {
1099               mode->c_lflag &= ~XCASE;
1100               mode->c_iflag &= ~IUCLC;
1101               mode->c_oflag &= ~OLCUC;
1102             }
1103           else
1104             {
1105               mode->c_lflag |= XCASE;
1106               mode->c_iflag |= IUCLC;
1107               mode->c_oflag |= OLCUC;
1108             }
1109         }
1110 #endif
1111       else if (!strcmp (info->name, "crt"))
1112         mode->c_lflag |= ECHOE
1113 #ifdef ECHOCTL
1114           | ECHOCTL
1115 #endif
1116 #ifdef ECHOKE
1117           | ECHOKE
1118 #endif
1119           ;
1120       else if (!strcmp (info->name, "dec"))
1121         {
1122           mode->c_cc[VINTR] = 3;        /* ^C */
1123           mode->c_cc[VERASE] = 127;     /* DEL */
1124           mode->c_cc[VKILL] = 21;       /* ^U */
1125           mode->c_lflag |= ECHOE
1126 #ifdef ECHOCTL
1127             | ECHOCTL
1128 #endif
1129 #ifdef ECHOKE
1130             | ECHOKE
1131 #endif
1132             ;
1133 #ifdef IXANY
1134           mode->c_iflag &= ~IXANY;
1135 #endif
1136         }
1137     }
1138   else if (reversed)
1139     *bitsp = *bitsp & ~info->mask & ~info->bits;
1140   else
1141     *bitsp = (*bitsp & ~info->mask) | info->bits;
1142
1143   return 1;
1144 }
1145
1146 static void
1147 set_control_char (struct control_info *info, const char *arg,
1148                   struct termios *mode)
1149 {
1150   unsigned char value;
1151
1152   if (!strcmp (info->name, "min") || !strcmp (info->name, "time"))
1153     value = integer_arg (arg);
1154   else if (arg[0] == '\0' || arg[1] == '\0')
1155     value = arg[0];
1156   else if (!strcmp (arg, "^-") || !strcmp (arg, "undef"))
1157     value = _POSIX_VDISABLE;
1158   else if (arg[0] == '^' && arg[1] != '\0')     /* Ignore any trailing junk. */
1159     {
1160       if (arg[1] == '?')
1161         value = 127;
1162       else
1163         value = arg[1] & ~0140; /* Non-letters get weird results. */
1164     }
1165   else
1166     value = integer_arg (arg);
1167   mode->c_cc[info->offset] = value;
1168 }
1169
1170 static void
1171 set_speed (enum speed_setting type, const char *arg, struct termios *mode)
1172 {
1173   speed_t baud;
1174
1175   baud = string_to_baud (arg);
1176   if (type == input_speed || type == both_speeds)
1177     cfsetispeed (mode, baud);
1178   if (type == output_speed || type == both_speeds)
1179     cfsetospeed (mode, baud);
1180 }
1181
1182 #ifdef TIOCGWINSZ
1183
1184 /* Get window size information.  First try getting the information
1185    associated with standard output and if that fails, try standard input.
1186    Return zero for success, nonzero if both ioctl's failed.  */
1187
1188 static int
1189 get_win_size (struct winsize *win)
1190 {
1191   int err;
1192
1193   err = ioctl (1, TIOCGWINSZ, (char *) win);
1194   if (err != 0)
1195     err = ioctl (0, TIOCGWINSZ, (char *) win);
1196   return err;
1197 }
1198
1199 static void
1200 set_window_size (int rows, int cols)
1201 {
1202   struct winsize win;
1203
1204   if (get_win_size (&win))
1205     {
1206       if (errno != EINVAL)
1207         error (1, errno, _("standard input"));
1208       memset (&win, 0, sizeof (win));
1209     }
1210
1211   if (rows >= 0)
1212     win.ws_row = rows;
1213   if (cols >= 0)
1214     win.ws_col = cols;
1215
1216 # ifdef TIOCSSIZE
1217   /* Alexander Dupuy <dupuy@cs.columbia.edu> wrote:
1218      The following code deals with a bug in the SunOS 4.x (and 3.x?) kernel.
1219      This comment from sys/ttold.h describes Sun's twisted logic - a better
1220      test would have been (ts_lines > 64k || ts_cols > 64k || ts_cols == 0).
1221      At any rate, the problem is gone in Solaris 2.x.
1222
1223      Unfortunately, the old TIOCSSIZE code does collide with TIOCSWINSZ,
1224      but they can be disambiguated by checking whether a "struct ttysize"
1225      structure's "ts_lines" field is greater than 64K or not.  If so,
1226      it's almost certainly a "struct winsize" instead.
1227
1228      At any rate, the bug manifests itself when ws_row == 0; the symptom is
1229      that ws_row is set to ws_col, and ws_col is set to (ws_xpixel<<16) +
1230      ws_ypixel.  Since GNU stty sets rows and columns separately, this bug
1231      caused "stty rows 0 cols 0" to set rows to cols and cols to 0, while
1232      "stty cols 0 rows 0" would do the right thing.  On a little-endian
1233      machine like the sun386i, the problem is the same, but for ws_col == 0.
1234
1235      The workaround is to do the ioctl once with row and col = 1 to set the
1236      pixel info, and then do it again using a TIOCSSIZE to set rows/cols.  */
1237
1238   if (win.ws_row == 0 || win.ws_col == 0)
1239     {
1240       struct ttysize ttysz;
1241
1242       ttysz.ts_lines = win.ws_row;
1243       ttysz.ts_cols = win.ws_col;
1244
1245       win.ws_row = 1;
1246       win.ws_col = 1;
1247
1248       if (ioctl (0, TIOCSWINSZ, (char *) &win))
1249         error (1, errno, _("standard input"));
1250
1251       if (ioctl (0, TIOCSSIZE, (char *) &ttysz))
1252         error (1, errno, _("standard input"));
1253       return;
1254     }
1255 # endif
1256
1257   if (ioctl (0, TIOCSWINSZ, (char *) &win))
1258     error (1, errno, _("standard input"));
1259 }
1260
1261 static void
1262 display_window_size (int fancy)
1263 {
1264   struct winsize win;
1265
1266   if (get_win_size (&win))
1267     {
1268       if (errno != EINVAL)
1269         error (1, errno, _("standard input"));
1270     }
1271   else
1272     {
1273       wrapf (fancy ? "rows %d; columns %d;" : "%d %d\n",
1274              win.ws_row, win.ws_col);
1275       if (!fancy)
1276         current_col = 0;
1277     }
1278 }
1279 #endif
1280
1281 static int
1282 screen_columns (void)
1283 {
1284 #ifdef TIOCGWINSZ
1285   struct winsize win;
1286
1287   if (get_win_size (&win))
1288     {
1289       /* With Solaris 2.[123], this ioctl fails and errno is set to
1290          EINVAL for telnet (but not rlogin) sessions.  */
1291       if (errno != EINVAL)
1292         error (1, errno, _("standard input"));
1293     }
1294   else if (win.ws_col > 0)
1295     return win.ws_col;
1296 #endif
1297   if (getenv ("COLUMNS"))
1298     return atoi (getenv ("COLUMNS"));
1299   return 80;
1300 }
1301
1302 static tcflag_t *
1303 mode_type_flag (enum mode_type type, struct termios *mode)
1304 {
1305   switch (type)
1306     {
1307     case control:
1308       return &mode->c_cflag;
1309
1310     case input:
1311       return &mode->c_iflag;
1312
1313     case output:
1314       return &mode->c_oflag;
1315
1316     case local:
1317       return &mode->c_lflag;
1318
1319     case combination:
1320       return NULL;
1321
1322     default:
1323       abort ();
1324     }
1325 }
1326
1327 static void
1328 display_settings (enum output_type output_type, struct termios *mode)
1329 {
1330   switch (output_type)
1331     {
1332     case changed:
1333       display_changed (mode);
1334       break;
1335
1336     case all:
1337       display_all (mode);
1338       break;
1339
1340     case recoverable:
1341       display_recoverable (mode);
1342       break;
1343     }
1344 }
1345
1346 static void
1347 display_changed (struct termios *mode)
1348 {
1349   int i;
1350   int empty_line;
1351   tcflag_t *bitsp;
1352   unsigned long mask;
1353   enum mode_type prev_type = control;
1354
1355   display_speed (mode, 1);
1356 #ifdef HAVE_C_LINE
1357   wrapf ("line = %d;", mode->c_line);
1358 #endif
1359   putchar ('\n');
1360   current_col = 0;
1361
1362   empty_line = 1;
1363   for (i = 0; strcmp (control_info[i].name, "min"); ++i)
1364     {
1365       if (mode->c_cc[control_info[i].offset] == control_info[i].saneval)
1366         continue;
1367       empty_line = 0;
1368       wrapf ("%s = %s;", control_info[i].name,
1369              visible (mode->c_cc[control_info[i].offset]));
1370     }
1371   if ((mode->c_lflag & ICANON) == 0)
1372     {
1373       wrapf ("min = %d; time = %d;\n", (int) mode->c_cc[VMIN],
1374              (int) mode->c_cc[VTIME]);
1375     }
1376   else if (empty_line == 0)
1377     putchar ('\n');
1378   current_col = 0;
1379
1380   empty_line = 1;
1381   for (i = 0; mode_info[i].name != NULL; ++i)
1382     {
1383       if (mode_info[i].flags & OMIT)
1384         continue;
1385       if (mode_info[i].type != prev_type)
1386         {
1387           if (empty_line == 0)
1388             {
1389               putchar ('\n');
1390               current_col = 0;
1391               empty_line = 1;
1392             }
1393           prev_type = mode_info[i].type;
1394         }
1395
1396       bitsp = mode_type_flag (mode_info[i].type, mode);
1397       mask = mode_info[i].mask ? mode_info[i].mask : mode_info[i].bits;
1398       if ((*bitsp & mask) == mode_info[i].bits)
1399         {
1400           if (mode_info[i].flags & SANE_UNSET)
1401             {
1402               wrapf ("%s", mode_info[i].name);
1403               empty_line = 0;
1404             }
1405         }
1406       else if ((mode_info[i].flags & (SANE_SET | REV)) == (SANE_SET | REV))
1407         {
1408           wrapf ("-%s", mode_info[i].name);
1409           empty_line = 0;
1410         }
1411     }
1412   if (empty_line == 0)
1413     putchar ('\n');
1414   current_col = 0;
1415 }
1416
1417 static void
1418 display_all (struct termios *mode)
1419 {
1420   int i;
1421   tcflag_t *bitsp;
1422   unsigned long mask;
1423   enum mode_type prev_type = control;
1424
1425   display_speed (mode, 1);
1426 #ifdef TIOCGWINSZ
1427   display_window_size (1);
1428 #endif
1429 #ifdef HAVE_C_LINE
1430   wrapf ("line = %d;", mode->c_line);
1431 #endif
1432   putchar ('\n');
1433   current_col = 0;
1434
1435   for (i = 0; strcmp (control_info[i].name, "min"); ++i)
1436     {
1437       wrapf ("%s = %s;", control_info[i].name,
1438              visible (mode->c_cc[control_info[i].offset]));
1439     }
1440   wrapf ("min = %d; time = %d;\n", mode->c_cc[VMIN], mode->c_cc[VTIME]);
1441   current_col = 0;
1442
1443   for (i = 0; mode_info[i].name != NULL; ++i)
1444     {
1445       if (mode_info[i].flags & OMIT)
1446         continue;
1447       if (mode_info[i].type != prev_type)
1448         {
1449           putchar ('\n');
1450           current_col = 0;
1451           prev_type = mode_info[i].type;
1452         }
1453
1454       bitsp = mode_type_flag (mode_info[i].type, mode);
1455       mask = mode_info[i].mask ? mode_info[i].mask : mode_info[i].bits;
1456       if ((*bitsp & mask) == mode_info[i].bits)
1457         wrapf ("%s", mode_info[i].name);
1458       else if (mode_info[i].flags & REV)
1459         wrapf ("-%s", mode_info[i].name);
1460     }
1461   putchar ('\n');
1462   current_col = 0;
1463 }
1464
1465 static void
1466 display_speed (struct termios *mode, int fancy)
1467 {
1468   if (cfgetispeed (mode) == 0 || cfgetispeed (mode) == cfgetospeed (mode))
1469     wrapf (fancy ? "speed %lu baud;" : "%lu\n",
1470            baud_to_value (cfgetospeed (mode)));
1471   else
1472     wrapf (fancy ? "ispeed %lu baud; ospeed %lu baud;" : "%lu %lu\n",
1473            baud_to_value (cfgetispeed (mode)),
1474            baud_to_value (cfgetospeed (mode)));
1475   if (!fancy)
1476     current_col = 0;
1477 }
1478
1479 static void
1480 display_recoverable (struct termios *mode)
1481 {
1482   int i;
1483
1484   printf ("%lx:%lx:%lx:%lx",
1485           (unsigned long) mode->c_iflag, (unsigned long) mode->c_oflag,
1486           (unsigned long) mode->c_cflag, (unsigned long) mode->c_lflag);
1487   for (i = 0; i < NCCS; ++i)
1488     printf (":%x", (unsigned int) mode->c_cc[i]);
1489   putchar ('\n');
1490 }
1491
1492 static int
1493 recover_mode (char *arg, struct termios *mode)
1494 {
1495   int i, n;
1496   unsigned int chr;
1497   unsigned long iflag, oflag, cflag, lflag;
1498
1499   /* Scan into temporaries since it is too much trouble to figure out
1500      the right format for `tcflag_t'.  */
1501   if (sscanf (arg, "%lx:%lx:%lx:%lx%n",
1502               &iflag, &oflag, &cflag, &lflag, &n) != 4)
1503     return 0;
1504   mode->c_iflag = iflag;
1505   mode->c_oflag = oflag;
1506   mode->c_cflag = cflag;
1507   mode->c_lflag = lflag;
1508   arg += n;
1509   for (i = 0; i < NCCS; ++i)
1510     {
1511       if (sscanf (arg, ":%x%n", &chr, &n) != 1)
1512         return 0;
1513       mode->c_cc[i] = chr;
1514       arg += n;
1515     }
1516   return 1;
1517 }
1518
1519 struct speed_map
1520 {
1521   const char *string;           /* ASCII representation. */
1522   speed_t speed;                /* Internal form. */
1523   unsigned long value;          /* Numeric value. */
1524 };
1525
1526 struct speed_map speeds[] =
1527 {
1528   {"0", B0, 0},
1529   {"50", B50, 50},
1530   {"75", B75, 75},
1531   {"110", B110, 110},
1532   {"134", B134, 134},
1533   {"134.5", B134, 134},
1534   {"150", B150, 150},
1535   {"200", B200, 200},
1536   {"300", B300, 300},
1537   {"600", B600, 600},
1538   {"1200", B1200, 1200},
1539   {"1800", B1800, 1800},
1540   {"2400", B2400, 2400},
1541   {"4800", B4800, 4800},
1542   {"9600", B9600, 9600},
1543   {"19200", B19200, 19200},
1544   {"38400", B38400, 38400},
1545   {"exta", B19200, 19200},
1546   {"extb", B38400, 38400},
1547 #ifdef B57600
1548   {"57600", B57600, 57600},
1549 #endif
1550 #ifdef B115200
1551   {"115200", B115200, 115200},
1552 #endif
1553   {NULL, 0, 0}
1554 };
1555
1556 static speed_t
1557 string_to_baud (const char *arg)
1558 {
1559   int i;
1560
1561   for (i = 0; speeds[i].string != NULL; ++i)
1562     if (!strcmp (arg, speeds[i].string))
1563       return speeds[i].speed;
1564   return (speed_t) -1;
1565 }
1566
1567 static unsigned long
1568 baud_to_value (speed_t speed)
1569 {
1570   int i;
1571
1572   for (i = 0; speeds[i].string != NULL; ++i)
1573     if (speed == speeds[i].speed)
1574       return speeds[i].value;
1575   return 0;
1576 }
1577
1578 static void
1579 sane_mode (struct termios *mode)
1580 {
1581   int i;
1582   tcflag_t *bitsp;
1583
1584   for (i = 0; control_info[i].name; ++i)
1585     {
1586 #if VMIN == VEOF
1587       if (!strcmp (control_info[i].name, "min"))
1588         break;
1589 #endif
1590       mode->c_cc[control_info[i].offset] = control_info[i].saneval;
1591     }
1592
1593   for (i = 0; mode_info[i].name != NULL; ++i)
1594     {
1595       if (mode_info[i].flags & SANE_SET)
1596         {
1597           bitsp = mode_type_flag (mode_info[i].type, mode);
1598           *bitsp = (*bitsp & ~mode_info[i].mask) | mode_info[i].bits;
1599         }
1600       else if (mode_info[i].flags & SANE_UNSET)
1601         {
1602           bitsp = mode_type_flag (mode_info[i].type, mode);
1603           *bitsp = *bitsp & ~mode_info[i].mask & ~mode_info[i].bits;
1604         }
1605     }
1606 }
1607
1608 /* Return a string that is the printable representation of character CH.  */
1609 /* Adapted from `cat' by Torbjorn Granlund.  */
1610
1611 static const char *
1612 visible (unsigned int ch)
1613 {
1614   static char buf[10];
1615   char *bpout = buf;
1616
1617   if (ch == _POSIX_VDISABLE)
1618     return _("<undef>");
1619
1620   if (ch >= 32)
1621     {
1622       if (ch < 127)
1623         *bpout++ = ch;
1624       else if (ch == 127)
1625         {
1626           *bpout++ = '^';
1627           *bpout++ = '?';
1628         }
1629       else
1630         {
1631           *bpout++ = 'M',
1632             *bpout++ = '-';
1633           if (ch >= 128 + 32)
1634             {
1635               if (ch < 128 + 127)
1636                 *bpout++ = ch - 128;
1637               else
1638                 {
1639                   *bpout++ = '^';
1640                   *bpout++ = '?';
1641                 }
1642             }
1643           else
1644             {
1645               *bpout++ = '^';
1646               *bpout++ = ch - 128 + 64;
1647             }
1648         }
1649     }
1650   else
1651     {
1652       *bpout++ = '^';
1653       *bpout++ = ch + 64;
1654     }
1655   *bpout = '\0';
1656   return (const char *) buf;
1657 }
1658
1659 /* Parse string S as an integer, using decimal radix by default,
1660    but allowing octal and hex numbers as in C.  */
1661 /* From `od' by Richard Stallman.  */
1662
1663 static long
1664 integer_arg (const char *s)
1665 {
1666   long value;
1667   if (xstrtol (s, NULL, 0, &value, "bB") != LONGINT_OK)
1668     {
1669       error (0, 0, _("invalid integer argument `%s'"), s);
1670       usage (1);
1671     }
1672   return value;
1673 }