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);
573 if (!(i == 4 || i == 5))
579 static int recover_mode(const char *arg, struct termios *mode)
583 unsigned long iflag, oflag, cflag, lflag;
585 /* Scan into temporaries since it is too much trouble to figure out
586 the right format for 'tcflag_t' */
587 if (sscanf(arg, "%lx:%lx:%lx:%lx%n",
588 &iflag, &oflag, &cflag, &lflag, &n) != 4)
590 mode->c_iflag = iflag;
591 mode->c_oflag = oflag;
592 mode->c_cflag = cflag;
593 mode->c_lflag = lflag;
595 for (i = 0; i < NCCS; ++i) {
596 if (sscanf(arg, ":%x%n", &chr, &n) != 1)
602 /* Fail if there are too many fields */
609 static void display_recoverable(const struct termios *mode,
610 const int ATTRIBUTE_UNUSED dummy)
613 printf("%lx:%lx:%lx:%lx",
614 (unsigned long) mode->c_iflag, (unsigned long) mode->c_oflag,
615 (unsigned long) mode->c_cflag, (unsigned long) mode->c_lflag);
616 for (i = 0; i < NCCS; ++i)
617 printf(":%x", (unsigned int) mode->c_cc[i]);
621 static void display_speed(const struct termios *mode, int fancy)
624 const char *fmt_str = "%lu %lu\n\0ispeed %lu baud; ospeed %lu baud;";
625 unsigned long ispeed, ospeed;
627 ospeed = ispeed = cfgetispeed(mode);
628 if (ispeed == 0 || ispeed == (ospeed = cfgetospeed(mode))) {
629 ispeed = ospeed; /* in case ispeed was 0 */
631 fmt_str = "%lu\n\0\0\0\0\0speed %lu baud;";
633 if (fancy) fmt_str += 9;
634 wrapf(fmt_str, tty_baud_to_value(ispeed), tty_baud_to_value(ospeed));
637 static void do_display(const struct termios *mode, const int all)
642 int prev_type = control;
644 display_speed(mode, 1);
646 display_window_size(1);
648 wrapf("line = %d;\n", mode->c_line);
653 for (i = 0; control_info[i].name != stty_min; ++i) {
654 /* If swtch is the same as susp, don't print both */
656 if (control_info[i].name == stty_swtch)
659 /* If eof uses the same slot as min, only print whichever applies */
661 if ((mode->c_lflag & ICANON) == 0
662 && (control_info[i].name == stty_eof
663 || control_info[i].name == stty_eol)) continue;
665 wrapf("%s = %s;", control_info[i].name,
666 visible(mode->c_cc[control_info[i].offset]));
669 if ((mode->c_lflag & ICANON) == 0)
671 wrapf("min = %d; time = %d;", mode->c_cc[VMIN], mode->c_cc[VTIME]);
672 if (current_col) wrapf("\n");
674 for (i = 0; i < NUM_mode_info; ++i) {
675 if (mode_info[i].flags & OMIT)
677 if (mode_info[i].type != prev_type) {
679 if (current_col) wrapf("\n");
680 prev_type = mode_info[i].type;
683 bitsp = mode_type_flag(mode_info[i].type, mode);
684 mask = mode_info[i].mask ? mode_info[i].mask : mode_info[i].bits;
685 if ((*bitsp & mask) == mode_info[i].bits) {
686 if (all || (mode_info[i].flags & SANE_UNSET))
687 wrapf("%s", mode_info[i].name);
689 if ((all && mode_info[i].flags & REV) ||
691 (mode_info[i].flags & (SANE_SET | REV)) == (SANE_SET | REV)))
692 wrapf("-%s", mode_info[i].name);
695 if (current_col) wrapf("\n");
698 static void sane_mode(struct termios *mode)
703 for (i = 0; i < NUM_control_info; ++i) {
705 if (control_info[i].name == stty_min)
708 mode->c_cc[control_info[i].offset] = control_info[i].saneval;
711 for (i = 0; i < NUM_mode_info; ++i) {
712 if (mode_info[i].flags & SANE_SET) {
713 bitsp = mode_type_flag(mode_info[i].type, mode);
714 *bitsp = (*bitsp & ~((unsigned long)mode_info[i].mask))
716 } else if (mode_info[i].flags & SANE_UNSET) {
717 bitsp = mode_type_flag(mode_info[i].type, mode);
718 *bitsp = *bitsp & ~((unsigned long)mode_info[i].mask)
719 & ~mode_info[i].bits;
724 /* Save set_mode from #ifdef forest plague */
759 static void set_mode(const struct mode_info *info, int reversed,
760 struct termios *mode)
764 bitsp = mode_type_flag(info->type, mode);
768 *bitsp = *bitsp & ~info->mask & ~info->bits;
770 *bitsp = (*bitsp & ~info->mask) | info->bits;
774 /* Combination mode */
775 if (info->name == evenp || info->name == parity) {
777 mode->c_cflag = (mode->c_cflag & ~PARENB & ~CSIZE) | CS8;
779 mode->c_cflag = (mode->c_cflag & ~PARODD & ~CSIZE) | PARENB | CS7;
780 } else if (info->name == stty_oddp) {
782 mode->c_cflag = (mode->c_cflag & ~PARENB & ~CSIZE) | CS8;
784 mode->c_cflag = (mode->c_cflag & ~CSIZE) | CS7 | PARODD | PARENB;
785 } else if (info->name == stty_nl) {
787 mode->c_iflag = (mode->c_iflag | ICRNL) & ~INLCR & ~IGNCR;
788 mode->c_oflag = (mode->c_oflag | ONLCR) & ~OCRNL & ~ONLRET;
790 mode->c_iflag = mode->c_iflag & ~ICRNL;
791 if (ONLCR) mode->c_oflag = mode->c_oflag & ~ONLCR;
793 } else if (info->name == stty_ek) {
794 mode->c_cc[VERASE] = CERASE;
795 mode->c_cc[VKILL] = CKILL;
796 } else if (info->name == stty_sane) {
799 else if (info->name == cbreak) {
801 mode->c_lflag |= ICANON;
803 mode->c_lflag &= ~ICANON;
804 } else if (info->name == stty_pass8) {
806 mode->c_cflag = (mode->c_cflag & ~CSIZE) | CS7 | PARENB;
807 mode->c_iflag |= ISTRIP;
809 mode->c_cflag = (mode->c_cflag & ~PARENB & ~CSIZE) | CS8;
810 mode->c_iflag &= ~ISTRIP;
812 } else if (info->name == litout) {
814 mode->c_cflag = (mode->c_cflag & ~CSIZE) | CS7 | PARENB;
815 mode->c_iflag |= ISTRIP;
816 mode->c_oflag |= OPOST;
818 mode->c_cflag = (mode->c_cflag & ~PARENB & ~CSIZE) | CS8;
819 mode->c_iflag &= ~ISTRIP;
820 mode->c_oflag &= ~OPOST;
822 } else if (info->name == raw || info->name == cooked) {
823 if ((info->name[0] == 'r' && reversed)
824 || (info->name[0] == 'c' && !reversed)) {
826 mode->c_iflag |= BRKINT | IGNPAR | ISTRIP | ICRNL | IXON;
827 mode->c_oflag |= OPOST;
828 mode->c_lflag |= ISIG | ICANON;
830 mode->c_cc[VEOF] = CEOF;
833 mode->c_cc[VEOL] = CEOL;
838 mode->c_oflag &= ~OPOST;
839 mode->c_lflag &= ~(ISIG | ICANON | XCASE);
840 mode->c_cc[VMIN] = 1;
841 mode->c_cc[VTIME] = 0;
844 else if (IXANY && info->name == decctlq) {
846 mode->c_iflag |= IXANY;
848 mode->c_iflag &= ~IXANY;
850 else if (TABDLY && info->name == stty_tabs) {
852 mode->c_oflag = (mode->c_oflag & ~TABDLY) | TAB3;
854 mode->c_oflag = (mode->c_oflag & ~TABDLY) | TAB0;
856 else if (OXTABS && info->name == stty_tabs) {
858 mode->c_oflag |= OXTABS;
860 mode->c_oflag &= ~OXTABS;
862 else if (XCASE && IUCLC && OLCUC
863 && (info->name == stty_lcase || info->name == stty_LCASE)) {
865 mode->c_lflag &= ~XCASE;
866 mode->c_iflag &= ~IUCLC;
867 mode->c_oflag &= ~OLCUC;
869 mode->c_lflag |= XCASE;
870 mode->c_iflag |= IUCLC;
871 mode->c_oflag |= OLCUC;
874 else if (info->name == stty_crt) {
875 mode->c_lflag |= ECHOE | ECHOCTL | ECHOKE;
877 else if (info->name == stty_dec) {
878 mode->c_cc[VINTR] = 3; /* ^C */
879 mode->c_cc[VERASE] = 127; /* DEL */
880 mode->c_cc[VKILL] = 21; /* ^U */
881 mode->c_lflag |= ECHOE | ECHOCTL | ECHOKE;
882 if (IXANY) mode->c_iflag &= ~IXANY;
886 static void set_control_char_or_die(const struct control_info *info,
887 const char *arg, struct termios *mode)
891 if (info->name == stty_min || info->name == stty_time)
892 value = xatoul_range_sfx(arg, 0, 0xff, stty_suffixes);
893 else if (arg[0] == '\0' || arg[1] == '\0')
895 else if (!strcmp(arg, "^-") || !strcmp(arg, "undef"))
896 value = _POSIX_VDISABLE;
897 else if (arg[0] == '^') { /* Ignore any trailing junk (^Cjunk) */
898 value = arg[1] & 0x1f; /* Non-letters get weird results */
902 value = xatoul_range_sfx(arg, 0, 0xff, stty_suffixes);
903 mode->c_cc[info->offset] = value;
906 #define STTY_require_set_attr (1<<0)
907 #define STTY_speed_was_set (1<<1)
908 #define STTY_verbose_output (1<<2)
909 #define STTY_recoverable_output (1<<3)
910 #define STTY_noargs (1<<4)
911 int stty_main(int argc, char **argv);
912 int stty_main(int argc, char **argv)
915 void (*output_func)(const struct termios *, const int);
916 const char *file_name = NULL;
921 stty_state = STTY_noargs;
922 output_func = do_display;
924 /* First pass: only parse/verify command line params */
927 const struct mode_info *mp;
928 const struct control_info *cp;
929 const char *arg = argv[k];
930 const char *argnext = argv[k+1];
935 mp = find_mode(arg+1);
937 if (!(mp->flags & REV))
938 goto invalid_argument;
939 stty_state &= ~STTY_noargs;
942 /* It is an option - parse it */
947 stty_state |= STTY_verbose_output;
948 output_func = do_display;
952 stty_state |= STTY_recoverable_output;
953 output_func = display_recoverable;
957 bb_error_msg_and_die("only one device may be specified");
958 file_name = &arg[i+1]; /* "-Fdevice" ? */
959 if (!file_name[0]) { /* nope, "-F device" */
960 int p = k+1; /* argv[p] is argnext */
963 bb_error_msg_and_die(bb_msg_requires_arg, "-F");
964 /* remove -F param from arg[vc] */
966 while (argv[p]) { argv[p] = argv[p+1]; ++p; }
970 goto invalid_argument;
979 stty_state &= ~STTY_noargs;
983 cp = find_control(arg);
986 bb_error_msg_and_die(bb_msg_requires_arg, arg);
987 /* called for the side effect of xfunc death only */
988 set_control_char_or_die(cp, argnext, &mode);
989 stty_state &= ~STTY_noargs;
994 param = find_param(arg);
995 if (param & param_need_arg) {
997 bb_error_msg_and_die(bb_msg_requires_arg, arg);
1005 xatoul_range_sfx(argnext, 1, INT_MAX, stty_suffixes);
1007 # endif /* else fall-through */
1012 xatoul_range_sfx(argnext, 1, INT_MAX, stty_suffixes);
1019 /* called for the side effect of xfunc death only */
1020 set_speed_or_die(input_speed, argnext, &mode);
1023 /* called for the side effect of xfunc death only */
1024 set_speed_or_die(output_speed, argnext, &mode);
1027 if (recover_mode(arg, &mode) == 1) break;
1028 if (tty_value_to_baud(xatou(arg)) != (speed_t) -1) break;
1030 bb_error_msg_and_die("invalid argument '%s'", arg);
1032 stty_state &= ~STTY_noargs;
1035 /* Specifying both -a and -g is an error */
1036 if ((stty_state & (STTY_verbose_output | STTY_recoverable_output)) ==
1037 (STTY_verbose_output | STTY_recoverable_output))
1038 bb_error_msg_and_die("verbose and stty-readable output styles are mutually exclusive");
1039 /* Specifying -a or -g with non-options is an error */
1040 if (!(stty_state & STTY_noargs) &&
1041 (stty_state & (STTY_verbose_output | STTY_recoverable_output)))
1042 bb_error_msg_and_die("modes may not be set when specifying an output style");
1044 /* Now it is safe to start doing things */
1047 device_name = file_name;
1048 fd = xopen(device_name, O_RDONLY | O_NONBLOCK);
1049 if (fd != STDIN_FILENO) {
1050 dup2(fd, STDIN_FILENO);
1053 fdflags = fcntl(STDIN_FILENO, F_GETFL);
1055 fcntl(STDIN_FILENO, F_SETFL, fdflags & ~O_NONBLOCK) < 0)
1056 perror_on_device_and_die("%s: cannot reset non-blocking mode");
1059 /* Initialize to all zeroes so there is no risk memcmp will report a
1060 spurious difference in an uninitialized portion of the structure */
1061 memset(&mode, 0, sizeof(mode));
1062 if (tcgetattr(STDIN_FILENO, &mode))
1063 perror_on_device_and_die("%s");
1065 if (stty_state & (STTY_verbose_output | STTY_recoverable_output | STTY_noargs)) {
1066 get_terminal_width_height(STDOUT_FILENO, &max_col, NULL);
1067 output_func(&mode, display_all);
1068 return EXIT_SUCCESS;
1071 /* Second pass: perform actions */
1074 const struct mode_info *mp;
1075 const struct control_info *cp;
1076 const char *arg = argv[k];
1077 const char *argnext = argv[k+1];
1080 if (arg[0] == '-') {
1081 mp = find_mode(arg+1);
1083 set_mode(mp, 1 /* reversed */, &mode);
1084 stty_state |= STTY_require_set_attr;
1086 /* It is an option - already parsed. Skip it */
1090 mp = find_mode(arg);
1092 set_mode(mp, 0 /* non-reversed */, &mode);
1093 stty_state |= STTY_require_set_attr;
1097 cp = find_control(arg);
1100 set_control_char_or_die(cp, argnext, &mode);
1101 stty_state |= STTY_require_set_attr;
1105 param = find_param(arg);
1106 if (param & param_need_arg) {
1113 mode.c_line = xatoul_sfx(argnext, stty_suffixes);
1114 stty_state |= STTY_require_set_attr;
1119 set_window_size(-1, xatoul_sfx(argnext, stty_suffixes));
1122 display_window_size(0);
1125 set_window_size(xatoul_sfx(argnext, stty_suffixes), -1);
1129 display_speed(&mode, 0);
1132 set_speed_or_die(input_speed, argnext, &mode);
1133 stty_state |= (STTY_require_set_attr | STTY_speed_was_set);
1136 set_speed_or_die(output_speed, argnext, &mode);
1137 stty_state |= (STTY_require_set_attr | STTY_speed_was_set);
1140 if (recover_mode(arg, &mode) == 1)
1141 stty_state |= STTY_require_set_attr;
1142 else /* true: if (tty_value_to_baud(xatou(arg)) != (speed_t) -1) */{
1143 set_speed_or_die(both_speeds, arg, &mode);
1144 stty_state |= (STTY_require_set_attr | STTY_speed_was_set);
1145 } /* else - impossible (caught in the first pass):
1146 bb_error_msg_and_die("invalid argument '%s'", arg); */
1150 if (stty_state & STTY_require_set_attr) {
1151 struct termios new_mode;
1153 if (tcsetattr(STDIN_FILENO, TCSADRAIN, &mode))
1154 perror_on_device_and_die("%s");
1156 /* POSIX (according to Zlotnick's book) tcsetattr returns zero if
1157 it performs *any* of the requested operations. This means it
1158 can report 'success' when it has actually failed to perform
1159 some proper subset of the requested operations. To detect
1160 this partial failure, get the current terminal attributes and
1161 compare them to the requested ones */
1163 /* Initialize to all zeroes so there is no risk memcmp will report a
1164 spurious difference in an uninitialized portion of the structure */
1165 memset(&new_mode, 0, sizeof(new_mode));
1166 if (tcgetattr(STDIN_FILENO, &new_mode))
1167 perror_on_device_and_die("%s");
1169 if (memcmp(&mode, &new_mode, sizeof(mode)) != 0) {
1171 /* SunOS 4.1.3 (at least) has the problem that after this sequence,
1172 tcgetattr (&m1); tcsetattr (&m1); tcgetattr (&m2);
1173 sometimes (m1 != m2). The only difference is in the four bits
1174 of the c_cflag field corresponding to the baud rate. To save
1175 Sun users a little confusion, don't report an error if this
1176 happens. But suppress the error only if we haven't tried to
1177 set the baud rate explicitly -- otherwise we'd never give an
1178 error for a true failure to set the baud rate */
1180 new_mode.c_cflag &= (~CIBAUD);
1181 if ((stty_state & STTY_speed_was_set)
1182 || memcmp(&mode, &new_mode, sizeof(mode)) != 0)
1184 perror_on_device_and_die("%s: cannot perform all requested operations");
1188 return EXIT_SUCCESS;