1 /* vi: set sw=4 ts=4: */
2 /* stty -- change and print terminal line settings
3 Copyright (C) 1990-1999 Free Software Foundation, Inc.
5 Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
7 /* Usage: stty [-ag] [-F device] [setting...]
10 -a Write all current settings to stdout in human-readable form.
11 -g Write all current settings to stdout in stty-readable form.
12 -F Open and use the specified device instead of stdin
14 If no args are given, write to stdout the baud rate and settings that
15 have been changed from their defaults. Mode reading and changes
16 are done on the specified device, or stdin if none was specified.
18 David MacKenzie <djm@gnu.ai.mit.edu>
20 Special for busybox ported by Vladimir Oleynik <dzo@simtreas.ru> 2001
26 #ifndef _POSIX_VDISABLE
27 # define _POSIX_VDISABLE ((unsigned char) 0)
30 #define Control(c) ((c) & 0x1f)
31 /* Canonical values for control characters */
33 # define CINTR Control('c')
42 # define CKILL Control('u')
45 # define CEOF Control('d')
48 # define CEOL _POSIX_VDISABLE
51 # define CSTART Control('q')
54 # define CSTOP Control('s')
57 # define CSUSP Control('z')
59 #if defined(VEOL2) && !defined(CEOL2)
60 # define CEOL2 _POSIX_VDISABLE
62 /* ISC renamed swtch to susp for termios, but we'll accept either name */
63 #if defined(VSUSP) && !defined(VSWTCH)
67 #if defined(VSWTCH) && !defined(CSWTCH)
68 # define CSWTCH _POSIX_VDISABLE
71 /* SunOS 5.3 loses (^Z doesn't work) if 'swtch' is the same as 'susp'.
72 So the default is to disable 'swtch.' */
73 #if defined(__sparc__) && defined(__svr4__)
75 # define CSWTCH _POSIX_VDISABLE
78 #if defined(VWERSE) && !defined(VWERASE) /* AIX-3.2.5 */
79 # define VWERASE VWERSE
81 #if defined(VDSUSP) && !defined(CDSUSP)
82 # define CDSUSP Control('y')
84 #if !defined(VREPRINT) && defined(VRPRNT) /* Irix 4.0.5 */
85 # define VREPRINT VRPRNT
87 #if defined(VREPRINT) && !defined(CRPRNT)
88 # define CRPRNT Control('r')
90 #if defined(VWERASE) && !defined(CWERASE)
91 # define CWERASE Control('w')
93 #if defined(VLNEXT) && !defined(CLNEXT)
94 # define CLNEXT Control('v')
96 #if defined(VDISCARD) && !defined(VFLUSHO)
97 # define VFLUSHO VDISCARD
99 #if defined(VFLUSH) && !defined(VFLUSHO) /* Ultrix 4.2 */
100 # define VFLUSHO VFLUSH
102 #if defined(CTLECH) && !defined(ECHOCTL) /* Ultrix 4.3 */
103 # define ECHOCTL CTLECH
105 #if defined(TCTLECH) && !defined(ECHOCTL) /* Ultrix 4.2 */
106 # define ECHOCTL TCTLECH
108 #if defined(CRTKIL) && !defined(ECHOKE) /* Ultrix 4.2 and 4.3 */
109 # define ECHOKE CRTKIL
111 #if defined(VFLUSHO) && !defined(CFLUSHO)
112 # define CFLUSHO Control('o')
114 #if defined(VSTATUS) && !defined(CSTATUS)
115 # define CSTATUS Control('t')
118 /* Which speeds to set */
120 input_speed, output_speed, both_speeds
123 /* Which member(s) of 'struct termios' a mode uses */
125 /* Do NOT change the order or values, as mode_type_flag()
127 control, input, output, local, combination
130 static const char evenp [] = "evenp";
131 static const char raw [] = "raw";
132 static const char stty_min [] = "min";
133 static const char stty_time [] = "time";
134 static const char stty_swtch[] = "swtch";
135 static const char stty_eol [] = "eol";
136 static const char stty_eof [] = "eof";
137 static const char parity [] = "parity";
138 static const char stty_oddp [] = "oddp";
139 static const char stty_nl [] = "nl";
140 static const char stty_ek [] = "ek";
141 static const char stty_sane [] = "sane";
142 static const char cbreak [] = "cbreak";
143 static const char stty_pass8[] = "pass8";
144 static const char litout [] = "litout";
145 static const char cooked [] = "cooked";
146 static const char decctlq [] = "decctlq";
147 static const char stty_tabs [] = "tabs";
148 static const char stty_lcase[] = "lcase";
149 static const char stty_LCASE[] = "LCASE";
150 static const char stty_crt [] = "crt";
151 static const char stty_dec [] = "dec";
153 /* Flags for 'struct mode_info' */
154 #define SANE_SET 1 /* Set in 'sane' mode */
155 #define SANE_UNSET 2 /* Unset in 'sane' mode */
156 #define REV 4 /* Can be turned off by prepending '-' */
157 #define OMIT 8 /* Don't display value */
161 const char * const name; /* Name given on command line */
162 const unsigned char type; /* Which structure element to change */
163 const unsigned char flags; /* Setting and display options */
164 /* were using short here, but ppc32 was unhappy: */
165 const tcflag_t mask; /* Other bits to turn off for this mode */
166 const tcflag_t bits; /* Bits to set for this mode */
169 /* We can optimize it further by using name[8] instead of char *name */
170 /* but beware of "if (info->name == evenp)" checks! */
171 /* Need to replace them with "if (info == &mode_info[EVENP_INDX])" */
173 #define MI_ENTRY(N,T,F,B,M) { N, T, F, M, B }
175 static const struct mode_info mode_info[] = {
176 MI_ENTRY("parenb", control, REV, PARENB, 0 ),
177 MI_ENTRY("parodd", control, REV, PARODD, 0 ),
178 MI_ENTRY("cs5", control, 0, CS5, CSIZE),
179 MI_ENTRY("cs6", control, 0, CS6, CSIZE),
180 MI_ENTRY("cs7", control, 0, CS7, CSIZE),
181 MI_ENTRY("cs8", control, 0, CS8, CSIZE),
182 MI_ENTRY("hupcl", control, REV, HUPCL, 0 ),
183 MI_ENTRY("hup", control, REV | OMIT, HUPCL, 0 ),
184 MI_ENTRY("cstopb", control, REV, CSTOPB, 0 ),
185 MI_ENTRY("cread", control, SANE_SET | REV, CREAD, 0 ),
186 MI_ENTRY("clocal", control, REV, CLOCAL, 0 ),
188 MI_ENTRY("crtscts", control, REV, CRTSCTS, 0 ),
190 MI_ENTRY("ignbrk", input, SANE_UNSET | REV, IGNBRK, 0 ),
191 MI_ENTRY("brkint", input, SANE_SET | REV, BRKINT, 0 ),
192 MI_ENTRY("ignpar", input, REV, IGNPAR, 0 ),
193 MI_ENTRY("parmrk", input, REV, PARMRK, 0 ),
194 MI_ENTRY("inpck", input, REV, INPCK, 0 ),
195 MI_ENTRY("istrip", input, REV, ISTRIP, 0 ),
196 MI_ENTRY("inlcr", input, SANE_UNSET | REV, INLCR, 0 ),
197 MI_ENTRY("igncr", input, SANE_UNSET | REV, IGNCR, 0 ),
198 MI_ENTRY("icrnl", input, SANE_SET | REV, ICRNL, 0 ),
199 MI_ENTRY("ixon", input, REV, IXON, 0 ),
200 MI_ENTRY("ixoff", input, SANE_UNSET | REV, IXOFF, 0 ),
201 MI_ENTRY("tandem", input, REV | OMIT, IXOFF, 0 ),
203 MI_ENTRY("iuclc", input, SANE_UNSET | REV, IUCLC, 0 ),
206 MI_ENTRY("ixany", input, SANE_UNSET | REV, IXANY, 0 ),
209 MI_ENTRY("imaxbel", input, SANE_SET | REV, IMAXBEL, 0 ),
211 MI_ENTRY("opost", output, SANE_SET | REV, OPOST, 0 ),
213 MI_ENTRY("olcuc", output, SANE_UNSET | REV, OLCUC, 0 ),
216 MI_ENTRY("ocrnl", output, SANE_UNSET | REV, OCRNL, 0 ),
219 MI_ENTRY("onlcr", output, SANE_SET | REV, ONLCR, 0 ),
222 MI_ENTRY("onocr", output, SANE_UNSET | REV, ONOCR, 0 ),
225 MI_ENTRY("onlret", output, SANE_UNSET | REV, ONLRET, 0 ),
228 MI_ENTRY("ofill", output, SANE_UNSET | REV, OFILL, 0 ),
231 MI_ENTRY("ofdel", output, SANE_UNSET | REV, OFDEL, 0 ),
234 MI_ENTRY("nl1", output, SANE_UNSET, NL1, NLDLY),
235 MI_ENTRY("nl0", output, SANE_SET, NL0, NLDLY),
238 MI_ENTRY("cr3", output, SANE_UNSET, CR3, CRDLY),
239 MI_ENTRY("cr2", output, SANE_UNSET, CR2, CRDLY),
240 MI_ENTRY("cr1", output, SANE_UNSET, CR1, CRDLY),
241 MI_ENTRY("cr0", output, SANE_SET, CR0, CRDLY),
245 MI_ENTRY("tab3", output, SANE_UNSET, TAB3, TABDLY),
246 MI_ENTRY("tab2", output, SANE_UNSET, TAB2, TABDLY),
247 MI_ENTRY("tab1", output, SANE_UNSET, TAB1, TABDLY),
248 MI_ENTRY("tab0", output, SANE_SET, TAB0, TABDLY),
251 MI_ENTRY("tab3", output, SANE_UNSET, OXTABS, 0 ),
256 MI_ENTRY("bs1", output, SANE_UNSET, BS1, BSDLY),
257 MI_ENTRY("bs0", output, SANE_SET, BS0, BSDLY),
260 MI_ENTRY("vt1", output, SANE_UNSET, VT1, VTDLY),
261 MI_ENTRY("vt0", output, SANE_SET, VT0, VTDLY),
264 MI_ENTRY("ff1", output, SANE_UNSET, FF1, FFDLY),
265 MI_ENTRY("ff0", output, SANE_SET, FF0, FFDLY),
267 MI_ENTRY("isig", local, SANE_SET | REV, ISIG, 0 ),
268 MI_ENTRY("icanon", local, SANE_SET | REV, ICANON, 0 ),
270 MI_ENTRY("iexten", local, SANE_SET | REV, IEXTEN, 0 ),
272 MI_ENTRY("echo", local, SANE_SET | REV, ECHO, 0 ),
273 MI_ENTRY("echoe", local, SANE_SET | REV, ECHOE, 0 ),
274 MI_ENTRY("crterase", local, REV | OMIT, ECHOE, 0 ),
275 MI_ENTRY("echok", local, SANE_SET | REV, ECHOK, 0 ),
276 MI_ENTRY("echonl", local, SANE_UNSET | REV, ECHONL, 0 ),
277 MI_ENTRY("noflsh", local, SANE_UNSET | REV, NOFLSH, 0 ),
279 MI_ENTRY("xcase", local, SANE_UNSET | REV, XCASE, 0 ),
282 MI_ENTRY("tostop", local, SANE_UNSET | REV, TOSTOP, 0 ),
285 MI_ENTRY("echoprt", local, SANE_UNSET | REV, ECHOPRT, 0 ),
286 MI_ENTRY("prterase", local, REV | OMIT, ECHOPRT, 0 ),
289 MI_ENTRY("echoctl", local, SANE_SET | REV, ECHOCTL, 0 ),
290 MI_ENTRY("ctlecho", local, REV | OMIT, ECHOCTL, 0 ),
293 MI_ENTRY("echoke", local, SANE_SET | REV, ECHOKE, 0 ),
294 MI_ENTRY("crtkill", local, REV | OMIT, ECHOKE, 0 ),
296 MI_ENTRY(evenp, combination, REV | OMIT, 0, 0 ),
297 MI_ENTRY(parity, combination, REV | OMIT, 0, 0 ),
298 MI_ENTRY(stty_oddp, combination, REV | OMIT, 0, 0 ),
299 MI_ENTRY(stty_nl, combination, REV | OMIT, 0, 0 ),
300 MI_ENTRY(stty_ek, combination, OMIT, 0, 0 ),
301 MI_ENTRY(stty_sane, combination, OMIT, 0, 0 ),
302 MI_ENTRY(cooked, combination, REV | OMIT, 0, 0 ),
303 MI_ENTRY(raw, combination, REV | OMIT, 0, 0 ),
304 MI_ENTRY(stty_pass8, combination, REV | OMIT, 0, 0 ),
305 MI_ENTRY(litout, combination, REV | OMIT, 0, 0 ),
306 MI_ENTRY(cbreak, combination, REV | OMIT, 0, 0 ),
308 MI_ENTRY(decctlq, combination, REV | OMIT, 0, 0 ),
310 #if defined(TABDLY) || defined(OXTABS)
311 MI_ENTRY(stty_tabs, combination, REV | OMIT, 0, 0 ),
313 #if defined(XCASE) && defined(IUCLC) && defined(OLCUC)
314 MI_ENTRY(stty_lcase, combination, REV | OMIT, 0, 0 ),
315 MI_ENTRY(stty_LCASE, combination, REV | OMIT, 0, 0 ),
317 MI_ENTRY(stty_crt, combination, OMIT, 0, 0 ),
318 MI_ENTRY(stty_dec, combination, OMIT, 0, 0 ),
322 NUM_mode_info = ARRAY_SIZE(mode_info)
325 /* Control character settings */
326 struct control_info {
327 const char * const name; /* Name given on command line */
328 const unsigned char saneval; /* Value to set for 'stty sane' */
329 const unsigned char offset; /* Offset in c_cc */
332 /* Control characters */
334 static const struct control_info control_info[] = {
335 {"intr", CINTR, VINTR},
336 {"quit", CQUIT, VQUIT},
337 {"erase", CERASE, VERASE},
338 {"kill", CKILL, VKILL},
339 {stty_eof, CEOF, VEOF},
340 {stty_eol, CEOL, VEOL},
342 {"eol2", CEOL2, VEOL2},
345 {stty_swtch, CSWTCH, VSWTCH},
347 {"start", CSTART, VSTART},
348 {"stop", CSTOP, VSTOP},
349 {"susp", CSUSP, VSUSP},
351 {"dsusp", CDSUSP, VDSUSP},
354 {"rprnt", CRPRNT, VREPRINT},
357 {"werase", CWERASE, VWERASE},
360 {"lnext", CLNEXT, VLNEXT},
363 {"flush", CFLUSHO, VFLUSHO},
366 {"status", CSTATUS, VSTATUS},
368 /* These must be last because of the display routines */
370 {stty_time, 0, VTIME},
374 NUM_control_info = ARRAY_SIZE(control_info)
377 /* The width of the screen, for output wrapping */
378 unsigned max_col = 80; /* default */
381 /* Current position, to know when to wrap */
382 unsigned current_col;
385 #define G (*(struct globals*)&bb_common_bufsiz1)
387 static const char *device_name = bb_msg_standard_input;
389 /* Return a string that is the printable representation of character CH */
390 /* Adapted from 'cat' by Torbjorn Granlund */
391 static const char *visible(unsigned ch)
395 if (ch == _POSIX_VDISABLE)
407 } else if (ch < 127) {
418 static tcflag_t *mode_type_flag(unsigned type, const struct termios *mode)
420 static const unsigned char tcflag_offsets[] = {
421 offsetof(struct termios, c_cflag), /* control */
422 offsetof(struct termios, c_iflag), /* input */
423 offsetof(struct termios, c_oflag), /* output */
424 offsetof(struct termios, c_lflag), /* local */
428 return (tcflag_t*) (((char*)mode) + tcflag_offsets[type]);
433 static void set_speed_or_die(enum speed_setting type, const char * const arg,
434 struct termios * const mode)
438 baud = tty_value_to_baud(xatou(arg));
440 if (type != output_speed) { /* either input or both */
441 cfsetispeed(mode, baud);
443 if (type != input_speed) { /* either output or both */
444 cfsetospeed(mode, baud);
448 static ATTRIBUTE_NORETURN void perror_on_device_and_die(const char *fmt)
450 bb_perror_msg_and_die(fmt, device_name);
453 static void perror_on_device(const char *fmt)
455 bb_perror_msg(fmt, device_name);
458 /* Print format string MESSAGE and optional args.
459 Wrap to next line first if it won't fit.
460 Print a space first unless MESSAGE will start a new line */
461 static void wrapf(const char *message, ...)
467 va_start(args, message);
468 buflen = vsnprintf(buf, sizeof(buf), message, args);
470 /* We seem to be called only with suitable lengths, but check if
471 somebody failed to adhere to this assumption just to be sure. */
472 if (!buflen || buflen >= sizeof(buf)) return;
474 if (G.current_col > 0) {
476 if (buf[0] != '\n') {
477 if (G.current_col + buflen >= max_col) {
485 G.current_col += buflen;
486 if (buf[buflen-1] == '\n')
490 static void set_window_size(const int rows, const int cols)
492 struct winsize win = { 0, 0, 0, 0};
494 if (ioctl(STDIN_FILENO, TIOCGWINSZ, &win)) {
495 if (errno != EINVAL) {
498 memset(&win, 0, sizeof(win));
506 if (ioctl(STDIN_FILENO, TIOCSWINSZ, (char *) &win))
508 perror_on_device("%s");
511 static void display_window_size(const int fancy)
513 const char *fmt_str = "%s\0%s: no size information for this device";
514 unsigned width, height;
516 if (get_terminal_width_height(STDIN_FILENO, &width, &height)) {
517 if ((errno != EINVAL) || ((fmt_str += 2), !fancy)) {
518 perror_on_device(fmt_str);
521 wrapf(fancy ? "rows %d; columns %d;" : "%d %d\n",
526 static const struct suffix_mult stty_suffixes[] = {
533 static const struct mode_info *find_mode(const char *name)
536 for (i = 0; i < NUM_mode_info; ++i)
537 if (!strcmp(name, mode_info[i].name))
538 return &mode_info[i];
542 static const struct control_info *find_control(const char *name)
545 for (i = 0; i < NUM_control_info; ++i)
546 if (!strcmp(name, control_info[i].name))
547 return &control_info[i];
552 param_need_arg = 0x80,
553 param_line = 1 | 0x80,
554 param_rows = 2 | 0x80,
555 param_cols = 3 | 0x80,
556 param_columns = 4 | 0x80,
559 param_ispeed = 7 | 0x80,
560 param_ospeed = 8 | 0x80,
563 static int find_param(const char * const name)
565 static const char * const params[] = {
576 int i = index_in_str_array(params, name) + 1;
579 if (i != 5 && i != 6)
584 static int recover_mode(const char *arg, struct termios *mode)
588 unsigned long iflag, oflag, cflag, lflag;
590 /* Scan into temporaries since it is too much trouble to figure out
591 the right format for 'tcflag_t' */
592 if (sscanf(arg, "%lx:%lx:%lx:%lx%n",
593 &iflag, &oflag, &cflag, &lflag, &n) != 4)
595 mode->c_iflag = iflag;
596 mode->c_oflag = oflag;
597 mode->c_cflag = cflag;
598 mode->c_lflag = lflag;
600 for (i = 0; i < NCCS; ++i) {
601 if (sscanf(arg, ":%x%n", &chr, &n) != 1)
607 /* Fail if there are too many fields */
614 static void display_recoverable(const struct termios *mode,
615 int ATTRIBUTE_UNUSED dummy)
618 printf("%lx:%lx:%lx:%lx",
619 (unsigned long) mode->c_iflag, (unsigned long) mode->c_oflag,
620 (unsigned long) mode->c_cflag, (unsigned long) mode->c_lflag);
621 for (i = 0; i < NCCS; ++i)
622 printf(":%x", (unsigned int) mode->c_cc[i]);
626 static void display_speed(const struct termios *mode, int fancy)
629 const char *fmt_str = "%lu %lu\n\0ispeed %lu baud; ospeed %lu baud;";
630 unsigned long ispeed, ospeed;
632 ospeed = ispeed = cfgetispeed(mode);
633 if (ispeed == 0 || ispeed == (ospeed = cfgetospeed(mode))) {
634 ispeed = ospeed; /* in case ispeed was 0 */
636 fmt_str = "%lu\n\0\0\0\0\0speed %lu baud;";
638 if (fancy) fmt_str += 9;
639 wrapf(fmt_str, tty_baud_to_value(ispeed), tty_baud_to_value(ospeed));
642 static void do_display(const struct termios *mode, const int all)
647 int prev_type = control;
649 display_speed(mode, 1);
651 display_window_size(1);
653 wrapf("line = %d;\n", mode->c_line);
658 for (i = 0; control_info[i].name != stty_min; ++i) {
659 /* If swtch is the same as susp, don't print both */
661 if (control_info[i].name == stty_swtch)
664 /* If eof uses the same slot as min, only print whichever applies */
666 if ((mode->c_lflag & ICANON) == 0
667 && (control_info[i].name == stty_eof
668 || control_info[i].name == stty_eol)) continue;
670 wrapf("%s = %s;", control_info[i].name,
671 visible(mode->c_cc[control_info[i].offset]));
674 if ((mode->c_lflag & ICANON) == 0)
676 wrapf("min = %d; time = %d;", mode->c_cc[VMIN], mode->c_cc[VTIME]);
677 if (G.current_col) wrapf("\n");
679 for (i = 0; i < NUM_mode_info; ++i) {
680 if (mode_info[i].flags & OMIT)
682 if (mode_info[i].type != prev_type) {
684 if (G.current_col) wrapf("\n");
685 prev_type = mode_info[i].type;
688 bitsp = mode_type_flag(mode_info[i].type, mode);
689 mask = mode_info[i].mask ? mode_info[i].mask : mode_info[i].bits;
690 if ((*bitsp & mask) == mode_info[i].bits) {
691 if (all || (mode_info[i].flags & SANE_UNSET))
692 wrapf("%s", mode_info[i].name);
694 if ((all && mode_info[i].flags & REV) ||
696 (mode_info[i].flags & (SANE_SET | REV)) == (SANE_SET | REV)))
697 wrapf("-%s", mode_info[i].name);
700 if (G.current_col) wrapf("\n");
703 static void sane_mode(struct termios *mode)
708 for (i = 0; i < NUM_control_info; ++i) {
710 if (control_info[i].name == stty_min)
713 mode->c_cc[control_info[i].offset] = control_info[i].saneval;
716 for (i = 0; i < NUM_mode_info; ++i) {
717 if (mode_info[i].flags & SANE_SET) {
718 bitsp = mode_type_flag(mode_info[i].type, mode);
719 *bitsp = (*bitsp & ~((unsigned long)mode_info[i].mask))
721 } else if (mode_info[i].flags & SANE_UNSET) {
722 bitsp = mode_type_flag(mode_info[i].type, mode);
723 *bitsp = *bitsp & ~((unsigned long)mode_info[i].mask)
724 & ~mode_info[i].bits;
729 /* Save set_mode from #ifdef forest plague */
764 static void set_mode(const struct mode_info *info, int reversed,
765 struct termios *mode)
769 bitsp = mode_type_flag(info->type, mode);
773 *bitsp = *bitsp & ~info->mask & ~info->bits;
775 *bitsp = (*bitsp & ~info->mask) | info->bits;
779 /* Combination mode */
780 if (info->name == evenp || info->name == parity) {
782 mode->c_cflag = (mode->c_cflag & ~PARENB & ~CSIZE) | CS8;
784 mode->c_cflag = (mode->c_cflag & ~PARODD & ~CSIZE) | PARENB | CS7;
785 } else if (info->name == stty_oddp) {
787 mode->c_cflag = (mode->c_cflag & ~PARENB & ~CSIZE) | CS8;
789 mode->c_cflag = (mode->c_cflag & ~CSIZE) | CS7 | PARODD | PARENB;
790 } else if (info->name == stty_nl) {
792 mode->c_iflag = (mode->c_iflag | ICRNL) & ~INLCR & ~IGNCR;
793 mode->c_oflag = (mode->c_oflag | ONLCR) & ~OCRNL & ~ONLRET;
795 mode->c_iflag = mode->c_iflag & ~ICRNL;
796 if (ONLCR) mode->c_oflag = mode->c_oflag & ~ONLCR;
798 } else if (info->name == stty_ek) {
799 mode->c_cc[VERASE] = CERASE;
800 mode->c_cc[VKILL] = CKILL;
801 } else if (info->name == stty_sane) {
804 else if (info->name == cbreak) {
806 mode->c_lflag |= ICANON;
808 mode->c_lflag &= ~ICANON;
809 } else if (info->name == stty_pass8) {
811 mode->c_cflag = (mode->c_cflag & ~CSIZE) | CS7 | PARENB;
812 mode->c_iflag |= ISTRIP;
814 mode->c_cflag = (mode->c_cflag & ~PARENB & ~CSIZE) | CS8;
815 mode->c_iflag &= ~ISTRIP;
817 } else if (info->name == litout) {
819 mode->c_cflag = (mode->c_cflag & ~CSIZE) | CS7 | PARENB;
820 mode->c_iflag |= ISTRIP;
821 mode->c_oflag |= OPOST;
823 mode->c_cflag = (mode->c_cflag & ~PARENB & ~CSIZE) | CS8;
824 mode->c_iflag &= ~ISTRIP;
825 mode->c_oflag &= ~OPOST;
827 } else if (info->name == raw || info->name == cooked) {
828 if ((info->name[0] == 'r' && reversed)
829 || (info->name[0] == 'c' && !reversed)) {
831 mode->c_iflag |= BRKINT | IGNPAR | ISTRIP | ICRNL | IXON;
832 mode->c_oflag |= OPOST;
833 mode->c_lflag |= ISIG | ICANON;
835 mode->c_cc[VEOF] = CEOF;
838 mode->c_cc[VEOL] = CEOL;
843 mode->c_oflag &= ~OPOST;
844 mode->c_lflag &= ~(ISIG | ICANON | XCASE);
845 mode->c_cc[VMIN] = 1;
846 mode->c_cc[VTIME] = 0;
849 else if (IXANY && info->name == decctlq) {
851 mode->c_iflag |= IXANY;
853 mode->c_iflag &= ~IXANY;
855 else if (TABDLY && info->name == stty_tabs) {
857 mode->c_oflag = (mode->c_oflag & ~TABDLY) | TAB3;
859 mode->c_oflag = (mode->c_oflag & ~TABDLY) | TAB0;
861 else if (OXTABS && info->name == stty_tabs) {
863 mode->c_oflag |= OXTABS;
865 mode->c_oflag &= ~OXTABS;
867 else if (XCASE && IUCLC && OLCUC
868 && (info->name == stty_lcase || info->name == stty_LCASE)) {
870 mode->c_lflag &= ~XCASE;
871 mode->c_iflag &= ~IUCLC;
872 mode->c_oflag &= ~OLCUC;
874 mode->c_lflag |= XCASE;
875 mode->c_iflag |= IUCLC;
876 mode->c_oflag |= OLCUC;
879 else if (info->name == stty_crt) {
880 mode->c_lflag |= ECHOE | ECHOCTL | ECHOKE;
882 else if (info->name == stty_dec) {
883 mode->c_cc[VINTR] = 3; /* ^C */
884 mode->c_cc[VERASE] = 127; /* DEL */
885 mode->c_cc[VKILL] = 21; /* ^U */
886 mode->c_lflag |= ECHOE | ECHOCTL | ECHOKE;
887 if (IXANY) mode->c_iflag &= ~IXANY;
891 static void set_control_char_or_die(const struct control_info *info,
892 const char *arg, struct termios *mode)
896 if (info->name == stty_min || info->name == stty_time)
897 value = xatoul_range_sfx(arg, 0, 0xff, stty_suffixes);
898 else if (arg[0] == '\0' || arg[1] == '\0')
900 else if (!strcmp(arg, "^-") || !strcmp(arg, "undef"))
901 value = _POSIX_VDISABLE;
902 else if (arg[0] == '^') { /* Ignore any trailing junk (^Cjunk) */
903 value = arg[1] & 0x1f; /* Non-letters get weird results */
907 value = xatoul_range_sfx(arg, 0, 0xff, stty_suffixes);
908 mode->c_cc[info->offset] = value;
911 #define STTY_require_set_attr (1<<0)
912 #define STTY_speed_was_set (1<<1)
913 #define STTY_verbose_output (1<<2)
914 #define STTY_recoverable_output (1<<3)
915 #define STTY_noargs (1<<4)
916 int stty_main(int argc, char **argv);
917 int stty_main(int argc, char **argv)
920 void (*output_func)(const struct termios *, const int);
921 const char *file_name = NULL;
926 stty_state = STTY_noargs;
927 output_func = do_display;
929 /* First pass: only parse/verify command line params */
932 const struct mode_info *mp;
933 const struct control_info *cp;
934 const char *arg = argv[k];
935 const char *argnext = argv[k+1];
940 mp = find_mode(arg+1);
942 if (!(mp->flags & REV))
943 goto invalid_argument;
944 stty_state &= ~STTY_noargs;
947 /* It is an option - parse it */
952 stty_state |= STTY_verbose_output;
953 output_func = do_display;
957 stty_state |= STTY_recoverable_output;
958 output_func = display_recoverable;
962 bb_error_msg_and_die("only one device may be specified");
963 file_name = &arg[i+1]; /* "-Fdevice" ? */
964 if (!file_name[0]) { /* nope, "-F device" */
965 int p = k+1; /* argv[p] is argnext */
968 bb_error_msg_and_die(bb_msg_requires_arg, "-F");
969 /* remove -F param from arg[vc] */
971 while (argv[p]) { argv[p] = argv[p+1]; ++p; }
975 goto invalid_argument;
984 stty_state &= ~STTY_noargs;
988 cp = find_control(arg);
991 bb_error_msg_and_die(bb_msg_requires_arg, arg);
992 /* called for the side effect of xfunc death only */
993 set_control_char_or_die(cp, argnext, &mode);
994 stty_state &= ~STTY_noargs;
999 param = find_param(arg);
1000 if (param & param_need_arg) {
1002 bb_error_msg_and_die(bb_msg_requires_arg, arg);
1010 xatoul_range_sfx(argnext, 1, INT_MAX, stty_suffixes);
1012 # endif /* else fall-through */
1018 xatoul_range_sfx(argnext, 1, INT_MAX, stty_suffixes);
1025 /* called for the side effect of xfunc death only */
1026 set_speed_or_die(input_speed, argnext, &mode);
1029 /* called for the side effect of xfunc death only */
1030 set_speed_or_die(output_speed, argnext, &mode);
1033 if (recover_mode(arg, &mode) == 1) break;
1034 if (tty_value_to_baud(xatou(arg)) != (speed_t) -1) break;
1036 bb_error_msg_and_die("invalid argument '%s'", arg);
1038 stty_state &= ~STTY_noargs;
1041 /* Specifying both -a and -g is an error */
1042 if ((stty_state & (STTY_verbose_output | STTY_recoverable_output)) ==
1043 (STTY_verbose_output | STTY_recoverable_output))
1044 bb_error_msg_and_die("verbose and stty-readable output styles are mutually exclusive");
1045 /* Specifying -a or -g with non-options is an error */
1046 if (!(stty_state & STTY_noargs) &&
1047 (stty_state & (STTY_verbose_output | STTY_recoverable_output)))
1048 bb_error_msg_and_die("modes may not be set when specifying an output style");
1050 /* Now it is safe to start doing things */
1053 device_name = file_name;
1054 fd = xopen(device_name, O_RDONLY | O_NONBLOCK);
1055 if (fd != STDIN_FILENO) {
1056 dup2(fd, STDIN_FILENO);
1059 fdflags = fcntl(STDIN_FILENO, F_GETFL);
1061 fcntl(STDIN_FILENO, F_SETFL, fdflags & ~O_NONBLOCK) < 0)
1062 perror_on_device_and_die("%s: cannot reset non-blocking mode");
1065 /* Initialize to all zeroes so there is no risk memcmp will report a
1066 spurious difference in an uninitialized portion of the structure */
1067 memset(&mode, 0, sizeof(mode));
1068 if (tcgetattr(STDIN_FILENO, &mode))
1069 perror_on_device_and_die("%s");
1071 if (stty_state & (STTY_verbose_output | STTY_recoverable_output | STTY_noargs)) {
1072 get_terminal_width_height(STDOUT_FILENO, &max_col, NULL);
1073 output_func(&mode, display_all);
1074 return EXIT_SUCCESS;
1077 /* Second pass: perform actions */
1080 const struct mode_info *mp;
1081 const struct control_info *cp;
1082 const char *arg = argv[k];
1083 const char *argnext = argv[k+1];
1086 if (arg[0] == '-') {
1087 mp = find_mode(arg+1);
1089 set_mode(mp, 1 /* reversed */, &mode);
1090 stty_state |= STTY_require_set_attr;
1092 /* It is an option - already parsed. Skip it */
1096 mp = find_mode(arg);
1098 set_mode(mp, 0 /* non-reversed */, &mode);
1099 stty_state |= STTY_require_set_attr;
1103 cp = find_control(arg);
1106 set_control_char_or_die(cp, argnext, &mode);
1107 stty_state |= STTY_require_set_attr;
1111 param = find_param(arg);
1112 if (param & param_need_arg) {
1119 mode.c_line = xatoul_sfx(argnext, stty_suffixes);
1120 stty_state |= STTY_require_set_attr;
1125 set_window_size(-1, xatoul_sfx(argnext, stty_suffixes));
1128 display_window_size(0);
1131 set_window_size(xatoul_sfx(argnext, stty_suffixes), -1);
1135 display_speed(&mode, 0);
1138 set_speed_or_die(input_speed, argnext, &mode);
1139 stty_state |= (STTY_require_set_attr | STTY_speed_was_set);
1142 set_speed_or_die(output_speed, argnext, &mode);
1143 stty_state |= (STTY_require_set_attr | STTY_speed_was_set);
1146 if (recover_mode(arg, &mode) == 1)
1147 stty_state |= STTY_require_set_attr;
1148 else /* true: if (tty_value_to_baud(xatou(arg)) != (speed_t) -1) */{
1149 set_speed_or_die(both_speeds, arg, &mode);
1150 stty_state |= (STTY_require_set_attr | STTY_speed_was_set);
1151 } /* else - impossible (caught in the first pass):
1152 bb_error_msg_and_die("invalid argument '%s'", arg); */
1156 if (stty_state & STTY_require_set_attr) {
1157 struct termios new_mode;
1159 if (tcsetattr(STDIN_FILENO, TCSADRAIN, &mode))
1160 perror_on_device_and_die("%s");
1162 /* POSIX (according to Zlotnick's book) tcsetattr returns zero if
1163 it performs *any* of the requested operations. This means it
1164 can report 'success' when it has actually failed to perform
1165 some proper subset of the requested operations. To detect
1166 this partial failure, get the current terminal attributes and
1167 compare them to the requested ones */
1169 /* Initialize to all zeroes so there is no risk memcmp will report a
1170 spurious difference in an uninitialized portion of the structure */
1171 memset(&new_mode, 0, sizeof(new_mode));
1172 if (tcgetattr(STDIN_FILENO, &new_mode))
1173 perror_on_device_and_die("%s");
1175 if (memcmp(&mode, &new_mode, sizeof(mode)) != 0) {
1177 /* SunOS 4.1.3 (at least) has the problem that after this sequence,
1178 tcgetattr (&m1); tcsetattr (&m1); tcgetattr (&m2);
1179 sometimes (m1 != m2). The only difference is in the four bits
1180 of the c_cflag field corresponding to the baud rate. To save
1181 Sun users a little confusion, don't report an error if this
1182 happens. But suppress the error only if we haven't tried to
1183 set the baud rate explicitly -- otherwise we'd never give an
1184 error for a true failure to set the baud rate */
1186 new_mode.c_cflag &= (~CIBAUD);
1187 if ((stty_state & STTY_speed_was_set)
1188 || memcmp(&mode, &new_mode, sizeof(mode)) != 0)
1190 perror_on_device_and_die("%s: cannot perform all requested operations");
1194 return EXIT_SUCCESS;