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 = (sizeof(mode_info) / sizeof(mode_info[0]))
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 = (sizeof(control_info) / sizeof(control_info[0]))
377 /* The width of the screen, for output wrapping */
378 static unsigned max_col = 80; /* default */
379 /* Current position, to know when to wrap */
380 static unsigned current_col;
381 static const char *device_name = bb_msg_standard_input;
383 /* Return a string that is the printable representation of character CH */
384 /* Adapted from 'cat' by Torbjorn Granlund */
385 static const char *visible(unsigned int ch)
390 if (ch == _POSIX_VDISABLE)
402 } else if (ch < 127) {
413 static tcflag_t *mode_type_flag(unsigned type, const struct termios *mode)
415 static const unsigned char tcflag_offsets[] = {
416 offsetof(struct termios, c_cflag), /* control */
417 offsetof(struct termios, c_iflag), /* input */
418 offsetof(struct termios, c_oflag), /* output */
419 offsetof(struct termios, c_lflag), /* local */
423 return (tcflag_t*) (((char*)mode) + tcflag_offsets[type]);
428 static void set_speed_or_die(enum speed_setting type, const char * const arg,
429 struct termios * const mode)
433 baud = tty_value_to_baud(xatou(arg));
435 if (type != output_speed) { /* either input or both */
436 cfsetispeed(mode, baud);
438 if (type != input_speed) { /* either output or both */
439 cfsetospeed(mode, baud);
443 static ATTRIBUTE_NORETURN void perror_on_device_and_die(const char *fmt)
445 bb_perror_msg_and_die(fmt, device_name);
448 static void perror_on_device(const char *fmt)
450 bb_perror_msg(fmt, device_name);
453 /* Print format string MESSAGE and optional args.
454 Wrap to next line first if it won't fit.
455 Print a space first unless MESSAGE will start a new line */
456 static void wrapf(const char *message, ...)
462 va_start(args, message);
463 buflen = vsnprintf(buf, sizeof(buf), message, args);
465 /* We seem to be called only with suitable lengths, but check if
466 somebody failed to adhere to this assumption just to be sure. */
467 if (!buflen || buflen >= sizeof(buf)) return;
469 if (current_col > 0) {
471 if (buf[0] != '\n') {
472 if (current_col + buflen >= max_col) {
480 current_col += buflen;
481 if (buf[buflen-1] == '\n')
485 static void set_window_size(const int rows, const int cols)
487 struct winsize win = { 0, 0, 0, 0};
489 if (ioctl(STDIN_FILENO, TIOCGWINSZ, &win)) {
490 if (errno != EINVAL) {
493 memset(&win, 0, sizeof(win));
501 if (ioctl(STDIN_FILENO, TIOCSWINSZ, (char *) &win))
503 perror_on_device("%s");
506 static void display_window_size(const int fancy)
508 const char *fmt_str = "%s\0%s: no size information for this device";
509 unsigned width, height;
511 if (get_terminal_width_height(STDIN_FILENO, &width, &height)) {
512 if ((errno != EINVAL) || ((fmt_str += 2), !fancy)) {
513 perror_on_device(fmt_str);
516 wrapf(fancy ? "rows %d; columns %d;" : "%d %d\n",
521 static const struct suffix_mult stty_suffixes[] = {
528 static const struct mode_info *find_mode(const char *name)
531 for (i = 0; i < NUM_mode_info; ++i)
532 if (!strcmp(name, mode_info[i].name))
533 return &mode_info[i];
537 static const struct control_info *find_control(const char *name)
540 for (i = 0; i < NUM_control_info; ++i)
541 if (!strcmp(name, control_info[i].name))
542 return &control_info[i];
547 param_need_arg = 0x80,
548 param_line = 1 | 0x80,
549 param_rows = 2 | 0x80,
550 param_cols = 3 | 0x80,
553 param_ispeed = 6 | 0x80,
554 param_ospeed = 7 | 0x80,
557 static int find_param(const char * const name)
559 const char * const params[] = {
570 int i = index_in_str_array(params, name);
572 if (!(i == 4 || i == 5))
578 static int recover_mode(const char *arg, struct termios *mode)
582 unsigned long iflag, oflag, cflag, lflag;
584 /* Scan into temporaries since it is too much trouble to figure out
585 the right format for 'tcflag_t' */
586 if (sscanf(arg, "%lx:%lx:%lx:%lx%n",
587 &iflag, &oflag, &cflag, &lflag, &n) != 4)
589 mode->c_iflag = iflag;
590 mode->c_oflag = oflag;
591 mode->c_cflag = cflag;
592 mode->c_lflag = lflag;
594 for (i = 0; i < NCCS; ++i) {
595 if (sscanf(arg, ":%x%n", &chr, &n) != 1)
601 /* Fail if there are too many fields */
608 static void display_recoverable(const struct termios *mode,
609 const int ATTRIBUTE_UNUSED dummy)
612 printf("%lx:%lx:%lx:%lx",
613 (unsigned long) mode->c_iflag, (unsigned long) mode->c_oflag,
614 (unsigned long) mode->c_cflag, (unsigned long) mode->c_lflag);
615 for (i = 0; i < NCCS; ++i)
616 printf(":%x", (unsigned int) mode->c_cc[i]);
620 static void display_speed(const struct termios *mode, int fancy)
623 const char *fmt_str = "%lu %lu\n\0ispeed %lu baud; ospeed %lu baud;";
624 unsigned long ispeed, ospeed;
626 ospeed = ispeed = cfgetispeed(mode);
627 if (ispeed == 0 || ispeed == (ospeed = cfgetospeed(mode))) {
628 ispeed = ospeed; /* in case ispeed was 0 */
630 fmt_str = "%lu\n\0\0\0\0\0speed %lu baud;";
632 if (fancy) fmt_str += 9;
633 wrapf(fmt_str, tty_baud_to_value(ispeed), tty_baud_to_value(ospeed));
636 static void do_display(const struct termios *mode, const int all)
641 int prev_type = control;
643 display_speed(mode, 1);
645 display_window_size(1);
647 wrapf("line = %d;\n", mode->c_line);
652 for (i = 0; control_info[i].name != stty_min; ++i) {
653 /* If swtch is the same as susp, don't print both */
655 if (control_info[i].name == stty_swtch)
658 /* If eof uses the same slot as min, only print whichever applies */
660 if ((mode->c_lflag & ICANON) == 0
661 && (control_info[i].name == stty_eof
662 || control_info[i].name == stty_eol)) continue;
664 wrapf("%s = %s;", control_info[i].name,
665 visible(mode->c_cc[control_info[i].offset]));
668 if ((mode->c_lflag & ICANON) == 0)
670 wrapf("min = %d; time = %d;", mode->c_cc[VMIN], mode->c_cc[VTIME]);
671 if (current_col) wrapf("\n");
673 for (i = 0; i < NUM_mode_info; ++i) {
674 if (mode_info[i].flags & OMIT)
676 if (mode_info[i].type != prev_type) {
678 if (current_col) wrapf("\n");
679 prev_type = mode_info[i].type;
682 bitsp = mode_type_flag(mode_info[i].type, mode);
683 mask = mode_info[i].mask ? mode_info[i].mask : mode_info[i].bits;
684 if ((*bitsp & mask) == mode_info[i].bits) {
685 if (all || (mode_info[i].flags & SANE_UNSET))
686 wrapf("%s", mode_info[i].name);
688 if ((all && mode_info[i].flags & REV) ||
690 (mode_info[i].flags & (SANE_SET | REV)) == (SANE_SET | REV)))
691 wrapf("-%s", mode_info[i].name);
694 if (current_col) wrapf("\n");
697 static void sane_mode(struct termios *mode)
702 for (i = 0; i < NUM_control_info; ++i) {
704 if (control_info[i].name == stty_min)
707 mode->c_cc[control_info[i].offset] = control_info[i].saneval;
710 for (i = 0; i < NUM_mode_info; ++i) {
711 if (mode_info[i].flags & SANE_SET) {
712 bitsp = mode_type_flag(mode_info[i].type, mode);
713 *bitsp = (*bitsp & ~((unsigned long)mode_info[i].mask))
715 } else if (mode_info[i].flags & SANE_UNSET) {
716 bitsp = mode_type_flag(mode_info[i].type, mode);
717 *bitsp = *bitsp & ~((unsigned long)mode_info[i].mask)
718 & ~mode_info[i].bits;
723 /* Save set_mode from #ifdef forest plague */
758 static void set_mode(const struct mode_info *info, int reversed,
759 struct termios *mode)
763 bitsp = mode_type_flag(info->type, mode);
767 *bitsp = *bitsp & ~info->mask & ~info->bits;
769 *bitsp = (*bitsp & ~info->mask) | info->bits;
773 /* Combination mode */
774 if (info->name == evenp || info->name == parity) {
776 mode->c_cflag = (mode->c_cflag & ~PARENB & ~CSIZE) | CS8;
778 mode->c_cflag = (mode->c_cflag & ~PARODD & ~CSIZE) | PARENB | CS7;
779 } else if (info->name == stty_oddp) {
781 mode->c_cflag = (mode->c_cflag & ~PARENB & ~CSIZE) | CS8;
783 mode->c_cflag = (mode->c_cflag & ~CSIZE) | CS7 | PARODD | PARENB;
784 } else if (info->name == stty_nl) {
786 mode->c_iflag = (mode->c_iflag | ICRNL) & ~INLCR & ~IGNCR;
787 mode->c_oflag = (mode->c_oflag | ONLCR) & ~OCRNL & ~ONLRET;
789 mode->c_iflag = mode->c_iflag & ~ICRNL;
790 if (ONLCR) mode->c_oflag = mode->c_oflag & ~ONLCR;
792 } else if (info->name == stty_ek) {
793 mode->c_cc[VERASE] = CERASE;
794 mode->c_cc[VKILL] = CKILL;
795 } else if (info->name == stty_sane) {
798 else if (info->name == cbreak) {
800 mode->c_lflag |= ICANON;
802 mode->c_lflag &= ~ICANON;
803 } else if (info->name == stty_pass8) {
805 mode->c_cflag = (mode->c_cflag & ~CSIZE) | CS7 | PARENB;
806 mode->c_iflag |= ISTRIP;
808 mode->c_cflag = (mode->c_cflag & ~PARENB & ~CSIZE) | CS8;
809 mode->c_iflag &= ~ISTRIP;
811 } else if (info->name == litout) {
813 mode->c_cflag = (mode->c_cflag & ~CSIZE) | CS7 | PARENB;
814 mode->c_iflag |= ISTRIP;
815 mode->c_oflag |= OPOST;
817 mode->c_cflag = (mode->c_cflag & ~PARENB & ~CSIZE) | CS8;
818 mode->c_iflag &= ~ISTRIP;
819 mode->c_oflag &= ~OPOST;
821 } else if (info->name == raw || info->name == cooked) {
822 if ((info->name[0] == 'r' && reversed)
823 || (info->name[0] == 'c' && !reversed)) {
825 mode->c_iflag |= BRKINT | IGNPAR | ISTRIP | ICRNL | IXON;
826 mode->c_oflag |= OPOST;
827 mode->c_lflag |= ISIG | ICANON;
829 mode->c_cc[VEOF] = CEOF;
832 mode->c_cc[VEOL] = CEOL;
837 mode->c_oflag &= ~OPOST;
838 mode->c_lflag &= ~(ISIG | ICANON | XCASE);
839 mode->c_cc[VMIN] = 1;
840 mode->c_cc[VTIME] = 0;
843 else if (IXANY && info->name == decctlq) {
845 mode->c_iflag |= IXANY;
847 mode->c_iflag &= ~IXANY;
849 else if (TABDLY && info->name == stty_tabs) {
851 mode->c_oflag = (mode->c_oflag & ~TABDLY) | TAB3;
853 mode->c_oflag = (mode->c_oflag & ~TABDLY) | TAB0;
855 else if (OXTABS && info->name == stty_tabs) {
857 mode->c_oflag |= OXTABS;
859 mode->c_oflag &= ~OXTABS;
861 else if (XCASE && IUCLC && OLCUC
862 && (info->name == stty_lcase || info->name == stty_LCASE)) {
864 mode->c_lflag &= ~XCASE;
865 mode->c_iflag &= ~IUCLC;
866 mode->c_oflag &= ~OLCUC;
868 mode->c_lflag |= XCASE;
869 mode->c_iflag |= IUCLC;
870 mode->c_oflag |= OLCUC;
873 else if (info->name == stty_crt) {
874 mode->c_lflag |= ECHOE | ECHOCTL | ECHOKE;
876 else if (info->name == stty_dec) {
877 mode->c_cc[VINTR] = 3; /* ^C */
878 mode->c_cc[VERASE] = 127; /* DEL */
879 mode->c_cc[VKILL] = 21; /* ^U */
880 mode->c_lflag |= ECHOE | ECHOCTL | ECHOKE;
881 if (IXANY) mode->c_iflag &= ~IXANY;
885 static void set_control_char_or_die(const struct control_info *info,
886 const char *arg, struct termios *mode)
890 if (info->name == stty_min || info->name == stty_time)
891 value = xatoul_range_sfx(arg, 0, 0xff, stty_suffixes);
892 else if (arg[0] == '\0' || arg[1] == '\0')
894 else if (!strcmp(arg, "^-") || !strcmp(arg, "undef"))
895 value = _POSIX_VDISABLE;
896 else if (arg[0] == '^') { /* Ignore any trailing junk (^Cjunk) */
897 value = arg[1] & 0x1f; /* Non-letters get weird results */
901 value = xatoul_range_sfx(arg, 0, 0xff, stty_suffixes);
902 mode->c_cc[info->offset] = value;
905 #define STTY_require_set_attr (1<<0)
906 #define STTY_speed_was_set (1<<1)
907 #define STTY_verbose_output (1<<2)
908 #define STTY_recoverable_output (1<<3)
909 #define STTY_noargs (1<<4)
910 int stty_main(int argc, char **argv);
911 int stty_main(int argc, char **argv)
914 void (*output_func)(const struct termios *, const int);
915 const char *file_name = NULL;
920 stty_state = STTY_noargs;
921 output_func = do_display;
923 /* First pass: only parse/verify command line params */
926 const struct mode_info *mp;
927 const struct control_info *cp;
928 const char *arg = argv[k];
929 const char *argnext = argv[k+1];
934 mp = find_mode(arg+1);
936 if (!(mp->flags & REV))
937 goto invalid_argument;
938 stty_state &= ~STTY_noargs;
941 /* It is an option - parse it */
946 stty_state |= STTY_verbose_output;
947 output_func = do_display;
951 stty_state |= STTY_recoverable_output;
952 output_func = display_recoverable;
956 bb_error_msg_and_die("only one device may be specified");
957 file_name = &arg[i+1]; /* "-Fdevice" ? */
958 if (!file_name[0]) { /* nope, "-F device" */
959 int p = k+1; /* argv[p] is argnext */
962 bb_error_msg_and_die(bb_msg_requires_arg, "-F");
963 /* remove -F param from arg[vc] */
965 while (argv[p]) { argv[p] = argv[p+1]; ++p; }
969 goto invalid_argument;
978 stty_state &= ~STTY_noargs;
982 cp = find_control(arg);
985 bb_error_msg_and_die(bb_msg_requires_arg, arg);
986 /* called for the side effect of xfunc death only */
987 set_control_char_or_die(cp, argnext, &mode);
988 stty_state &= ~STTY_noargs;
993 param = find_param(arg);
994 if (param & param_need_arg) {
996 bb_error_msg_and_die(bb_msg_requires_arg, arg);
1004 xatoul_range_sfx(argnext, 1, INT_MAX, stty_suffixes);
1006 # endif /* else fall-through */
1011 xatoul_range_sfx(argnext, 1, INT_MAX, stty_suffixes);
1018 /* called for the side effect of xfunc death only */
1019 set_speed_or_die(input_speed, argnext, &mode);
1022 /* called for the side effect of xfunc death only */
1023 set_speed_or_die(output_speed, argnext, &mode);
1026 if (recover_mode(arg, &mode) == 1) break;
1027 if (tty_value_to_baud(xatou(arg)) != (speed_t) -1) break;
1029 bb_error_msg_and_die("invalid argument '%s'", arg);
1031 stty_state &= ~STTY_noargs;
1034 /* Specifying both -a and -g is an error */
1035 if ((stty_state & (STTY_verbose_output | STTY_recoverable_output)) ==
1036 (STTY_verbose_output | STTY_recoverable_output))
1037 bb_error_msg_and_die("verbose and stty-readable output styles are mutually exclusive");
1038 /* Specifying -a or -g with non-options is an error */
1039 if (!(stty_state & STTY_noargs) &&
1040 (stty_state & (STTY_verbose_output | STTY_recoverable_output)))
1041 bb_error_msg_and_die("modes may not be set when specifying an output style");
1043 /* Now it is safe to start doing things */
1046 device_name = file_name;
1047 fd = xopen(device_name, O_RDONLY | O_NONBLOCK);
1048 if (fd != STDIN_FILENO) {
1049 dup2(fd, STDIN_FILENO);
1052 fdflags = fcntl(STDIN_FILENO, F_GETFL);
1054 fcntl(STDIN_FILENO, F_SETFL, fdflags & ~O_NONBLOCK) < 0)
1055 perror_on_device_and_die("%s: cannot reset non-blocking mode");
1058 /* Initialize to all zeroes so there is no risk memcmp will report a
1059 spurious difference in an uninitialized portion of the structure */
1060 memset(&mode, 0, sizeof(mode));
1061 if (tcgetattr(STDIN_FILENO, &mode))
1062 perror_on_device_and_die("%s");
1064 if (stty_state & (STTY_verbose_output | STTY_recoverable_output | STTY_noargs)) {
1065 get_terminal_width_height(STDOUT_FILENO, &max_col, NULL);
1066 output_func(&mode, display_all);
1067 return EXIT_SUCCESS;
1070 /* Second pass: perform actions */
1073 const struct mode_info *mp;
1074 const struct control_info *cp;
1075 const char *arg = argv[k];
1076 const char *argnext = argv[k+1];
1079 if (arg[0] == '-') {
1080 mp = find_mode(arg+1);
1082 set_mode(mp, 1 /* reversed */, &mode);
1083 stty_state |= STTY_require_set_attr;
1085 /* It is an option - already parsed. Skip it */
1089 mp = find_mode(arg);
1091 set_mode(mp, 0 /* non-reversed */, &mode);
1092 stty_state |= STTY_require_set_attr;
1096 cp = find_control(arg);
1099 set_control_char_or_die(cp, argnext, &mode);
1100 stty_state |= STTY_require_set_attr;
1104 param = find_param(arg);
1105 if (param & param_need_arg) {
1112 mode.c_line = xatoul_sfx(argnext, stty_suffixes);
1113 stty_state |= STTY_require_set_attr;
1118 set_window_size(-1, xatoul_sfx(argnext, stty_suffixes));
1121 display_window_size(0);
1124 set_window_size(xatoul_sfx(argnext, stty_suffixes), -1);
1128 display_speed(&mode, 0);
1131 set_speed_or_die(input_speed, argnext, &mode);
1132 stty_state |= (STTY_require_set_attr | STTY_speed_was_set);
1135 set_speed_or_die(output_speed, argnext, &mode);
1136 stty_state |= (STTY_require_set_attr | STTY_speed_was_set);
1139 if (recover_mode(arg, &mode) == 1)
1140 stty_state |= STTY_require_set_attr;
1141 else /* true: if (tty_value_to_baud(xatou(arg)) != (speed_t) -1) */{
1142 set_speed_or_die(both_speeds, arg, &mode);
1143 stty_state |= (STTY_require_set_attr | STTY_speed_was_set);
1144 } /* else - impossible (caught in the first pass):
1145 bb_error_msg_and_die("invalid argument '%s'", arg); */
1149 if (stty_state & STTY_require_set_attr) {
1150 struct termios new_mode;
1152 if (tcsetattr(STDIN_FILENO, TCSADRAIN, &mode))
1153 perror_on_device_and_die("%s");
1155 /* POSIX (according to Zlotnick's book) tcsetattr returns zero if
1156 it performs *any* of the requested operations. This means it
1157 can report 'success' when it has actually failed to perform
1158 some proper subset of the requested operations. To detect
1159 this partial failure, get the current terminal attributes and
1160 compare them to the requested ones */
1162 /* Initialize to all zeroes so there is no risk memcmp will report a
1163 spurious difference in an uninitialized portion of the structure */
1164 memset(&new_mode, 0, sizeof(new_mode));
1165 if (tcgetattr(STDIN_FILENO, &new_mode))
1166 perror_on_device_and_die("%s");
1168 if (memcmp(&mode, &new_mode, sizeof(mode)) != 0) {
1170 /* SunOS 4.1.3 (at least) has the problem that after this sequence,
1171 tcgetattr (&m1); tcsetattr (&m1); tcgetattr (&m2);
1172 sometimes (m1 != m2). The only difference is in the four bits
1173 of the c_cflag field corresponding to the baud rate. To save
1174 Sun users a little confusion, don't report an error if this
1175 happens. But suppress the error only if we haven't tried to
1176 set the baud rate explicitly -- otherwise we'd never give an
1177 error for a true failure to set the baud rate */
1179 new_mode.c_cflag &= (~CIBAUD);
1180 if ((stty_state & STTY_speed_was_set)
1181 || memcmp(&mode, &new_mode, sizeof(mode)) != 0)
1183 perror_on_device_and_die("%s: cannot perform all requested operations");
1187 return EXIT_SUCCESS;