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busybox/coreutils/stty.c
Denys Vlasenko 98a4c7cf3d *: suppress ~60% of "aliased warnings" on gcc-4.4.1 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2010-02-04 15:00:15 +01:00

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/* vi: set sw=4 ts=4: */
/* stty -- change and print terminal line settings
Copyright (C) 1990-1999 Free Software Foundation, Inc.
Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*/
/* Usage: stty [-ag] [-F device] [setting...]
Options:
-a Write all current settings to stdout in human-readable form.
-g Write all current settings to stdout in stty-readable form.
-F Open and use the specified device instead of stdin
If no args are given, write to stdout the baud rate and settings that
have been changed from their defaults. Mode reading and changes
are done on the specified device, or stdin if none was specified.
David MacKenzie <djm@gnu.ai.mit.edu>
Special for busybox ported by Vladimir Oleynik <dzo@simtreas.ru> 2001
*/
#include "libbb.h"
#ifndef _POSIX_VDISABLE
# define _POSIX_VDISABLE ((unsigned char) 0)
#endif
#define Control(c) ((c) & 0x1f)
/* Canonical values for control characters */
#ifndef CINTR
# define CINTR Control('c')
#endif
#ifndef CQUIT
# define CQUIT 28
#endif
#ifndef CERASE
# define CERASE 127
#endif
#ifndef CKILL
# define CKILL Control('u')
#endif
#ifndef CEOF
# define CEOF Control('d')
#endif
#ifndef CEOL
# define CEOL _POSIX_VDISABLE
#endif
#ifndef CSTART
# define CSTART Control('q')
#endif
#ifndef CSTOP
# define CSTOP Control('s')
#endif
#ifndef CSUSP
# define CSUSP Control('z')
#endif
#if defined(VEOL2) && !defined(CEOL2)
# define CEOL2 _POSIX_VDISABLE
#endif
/* ISC renamed swtch to susp for termios, but we'll accept either name */
#if defined(VSUSP) && !defined(VSWTCH)
# define VSWTCH VSUSP
# define CSWTCH CSUSP
#endif
#if defined(VSWTCH) && !defined(CSWTCH)
# define CSWTCH _POSIX_VDISABLE
#endif
/* SunOS 5.3 loses (^Z doesn't work) if 'swtch' is the same as 'susp'.
So the default is to disable 'swtch.' */
#if defined(__sparc__) && defined(__svr4__)
# undef CSWTCH
# define CSWTCH _POSIX_VDISABLE
#endif
#if defined(VWERSE) && !defined(VWERASE) /* AIX-3.2.5 */
# define VWERASE VWERSE
#endif
#if defined(VDSUSP) && !defined(CDSUSP)
# define CDSUSP Control('y')
#endif
#if !defined(VREPRINT) && defined(VRPRNT) /* Irix 4.0.5 */
# define VREPRINT VRPRNT
#endif
#if defined(VREPRINT) && !defined(CRPRNT)
# define CRPRNT Control('r')
#endif
#if defined(VWERASE) && !defined(CWERASE)
# define CWERASE Control('w')
#endif
#if defined(VLNEXT) && !defined(CLNEXT)
# define CLNEXT Control('v')
#endif
#if defined(VDISCARD) && !defined(VFLUSHO)
# define VFLUSHO VDISCARD
#endif
#if defined(VFLUSH) && !defined(VFLUSHO) /* Ultrix 4.2 */
# define VFLUSHO VFLUSH
#endif
#if defined(CTLECH) && !defined(ECHOCTL) /* Ultrix 4.3 */
# define ECHOCTL CTLECH
#endif
#if defined(TCTLECH) && !defined(ECHOCTL) /* Ultrix 4.2 */
# define ECHOCTL TCTLECH
#endif
#if defined(CRTKIL) && !defined(ECHOKE) /* Ultrix 4.2 and 4.3 */
# define ECHOKE CRTKIL
#endif
#if defined(VFLUSHO) && !defined(CFLUSHO)
# define CFLUSHO Control('o')
#endif
#if defined(VSTATUS) && !defined(CSTATUS)
# define CSTATUS Control('t')
#endif
/* Which speeds to set */
enum speed_setting {
input_speed, output_speed, both_speeds
};
/* Which member(s) of 'struct termios' a mode uses */
enum {
/* Do NOT change the order or values, as mode_type_flag()
* depends on them */
control, input, output, local, combination
};
/* Flags for 'struct mode_info' */
#define SANE_SET 1 /* Set in 'sane' mode */
#define SANE_UNSET 2 /* Unset in 'sane' mode */
#define REV 4 /* Can be turned off by prepending '-' */
#define OMIT 8 /* Don't display value */
/* Each mode.
* This structure should be kept as small as humanly possible.
*/
struct mode_info {
const uint8_t type; /* Which structure element to change */
const uint8_t flags; /* Setting and display options */
/* only these values are ever used, so... */
#if (CSIZE | NLDLY | CRDLY | TABDLY | BSDLY | VTDLY | FFDLY) < 0x100
const uint8_t mask;
#elif (CSIZE | NLDLY | CRDLY | TABDLY | BSDLY | VTDLY | FFDLY) < 0x10000
const uint16_t mask;
#else
const tcflag_t mask; /* Other bits to turn off for this mode */
#endif
/* was using short here, but ppc32 was unhappy */
const tcflag_t bits; /* Bits to set for this mode */
};
enum {
/* Must match mode_name[] and mode_info[] order! */
IDX_evenp = 0,
IDX_parity,
IDX_oddp,
IDX_nl,
IDX_ek,
IDX_sane,
IDX_cooked,
IDX_raw,
IDX_pass8,
IDX_litout,
IDX_cbreak,
IDX_crt,
IDX_dec,
#ifdef IXANY
IDX_decctlq,
#endif
#if defined(TABDLY) || defined(OXTABS)
IDX_tabs,
#endif
#if defined(XCASE) && defined(IUCLC) && defined(OLCUC)
IDX_lcase,
IDX_LCASE,
#endif
};
#define MI_ENTRY(N,T,F,B,M) N "\0"
/* Mode names given on command line */
static const char mode_name[] =
MI_ENTRY("evenp", combination, REV | OMIT, 0, 0 )
MI_ENTRY("parity", combination, REV | OMIT, 0, 0 )
MI_ENTRY("oddp", combination, REV | OMIT, 0, 0 )
MI_ENTRY("nl", combination, REV | OMIT, 0, 0 )
MI_ENTRY("ek", combination, OMIT, 0, 0 )
MI_ENTRY("sane", combination, OMIT, 0, 0 )
MI_ENTRY("cooked", combination, REV | OMIT, 0, 0 )
MI_ENTRY("raw", combination, REV | OMIT, 0, 0 )
MI_ENTRY("pass8", combination, REV | OMIT, 0, 0 )
MI_ENTRY("litout", combination, REV | OMIT, 0, 0 )
MI_ENTRY("cbreak", combination, REV | OMIT, 0, 0 )
MI_ENTRY("crt", combination, OMIT, 0, 0 )
MI_ENTRY("dec", combination, OMIT, 0, 0 )
#ifdef IXANY
MI_ENTRY("decctlq", combination, REV | OMIT, 0, 0 )
#endif
#if defined(TABDLY) || defined(OXTABS)
MI_ENTRY("tabs", combination, REV | OMIT, 0, 0 )
#endif
#if defined(XCASE) && defined(IUCLC) && defined(OLCUC)
MI_ENTRY("lcase", combination, REV | OMIT, 0, 0 )
MI_ENTRY("LCASE", combination, REV | OMIT, 0, 0 )
#endif
MI_ENTRY("parenb", control, REV, PARENB, 0 )
MI_ENTRY("parodd", control, REV, PARODD, 0 )
MI_ENTRY("cs5", control, 0, CS5, CSIZE)
MI_ENTRY("cs6", control, 0, CS6, CSIZE)
MI_ENTRY("cs7", control, 0, CS7, CSIZE)
MI_ENTRY("cs8", control, 0, CS8, CSIZE)
MI_ENTRY("hupcl", control, REV, HUPCL, 0 )
MI_ENTRY("hup", control, REV | OMIT, HUPCL, 0 )
MI_ENTRY("cstopb", control, REV, CSTOPB, 0 )
MI_ENTRY("cread", control, SANE_SET | REV, CREAD, 0 )
MI_ENTRY("clocal", control, REV, CLOCAL, 0 )
#ifdef CRTSCTS
MI_ENTRY("crtscts", control, REV, CRTSCTS, 0 )
#endif
MI_ENTRY("ignbrk", input, SANE_UNSET | REV, IGNBRK, 0 )
MI_ENTRY("brkint", input, SANE_SET | REV, BRKINT, 0 )
MI_ENTRY("ignpar", input, REV, IGNPAR, 0 )
MI_ENTRY("parmrk", input, REV, PARMRK, 0 )
MI_ENTRY("inpck", input, REV, INPCK, 0 )
MI_ENTRY("istrip", input, REV, ISTRIP, 0 )
MI_ENTRY("inlcr", input, SANE_UNSET | REV, INLCR, 0 )
MI_ENTRY("igncr", input, SANE_UNSET | REV, IGNCR, 0 )
MI_ENTRY("icrnl", input, SANE_SET | REV, ICRNL, 0 )
MI_ENTRY("ixon", input, REV, IXON, 0 )
MI_ENTRY("ixoff", input, SANE_UNSET | REV, IXOFF, 0 )
MI_ENTRY("tandem", input, REV | OMIT, IXOFF, 0 )
#ifdef IUCLC
MI_ENTRY("iuclc", input, SANE_UNSET | REV, IUCLC, 0 )
#endif
#ifdef IXANY
MI_ENTRY("ixany", input, SANE_UNSET | REV, IXANY, 0 )
#endif
#ifdef IMAXBEL
MI_ENTRY("imaxbel", input, SANE_SET | REV, IMAXBEL, 0 )
#endif
MI_ENTRY("opost", output, SANE_SET | REV, OPOST, 0 )
#ifdef OLCUC
MI_ENTRY("olcuc", output, SANE_UNSET | REV, OLCUC, 0 )
#endif
#ifdef OCRNL
MI_ENTRY("ocrnl", output, SANE_UNSET | REV, OCRNL, 0 )
#endif
#ifdef ONLCR
MI_ENTRY("onlcr", output, SANE_SET | REV, ONLCR, 0 )
#endif
#ifdef ONOCR
MI_ENTRY("onocr", output, SANE_UNSET | REV, ONOCR, 0 )
#endif
#ifdef ONLRET
MI_ENTRY("onlret", output, SANE_UNSET | REV, ONLRET, 0 )
#endif
#ifdef OFILL
MI_ENTRY("ofill", output, SANE_UNSET | REV, OFILL, 0 )
#endif
#ifdef OFDEL
MI_ENTRY("ofdel", output, SANE_UNSET | REV, OFDEL, 0 )
#endif
#ifdef NLDLY
MI_ENTRY("nl1", output, SANE_UNSET, NL1, NLDLY)
MI_ENTRY("nl0", output, SANE_SET, NL0, NLDLY)
#endif
#ifdef CRDLY
MI_ENTRY("cr3", output, SANE_UNSET, CR3, CRDLY)
MI_ENTRY("cr2", output, SANE_UNSET, CR2, CRDLY)
MI_ENTRY("cr1", output, SANE_UNSET, CR1, CRDLY)
MI_ENTRY("cr0", output, SANE_SET, CR0, CRDLY)
#endif
#ifdef TABDLY
MI_ENTRY("tab3", output, SANE_UNSET, TAB3, TABDLY)
MI_ENTRY("tab2", output, SANE_UNSET, TAB2, TABDLY)
MI_ENTRY("tab1", output, SANE_UNSET, TAB1, TABDLY)
MI_ENTRY("tab0", output, SANE_SET, TAB0, TABDLY)
#else
# ifdef OXTABS
MI_ENTRY("tab3", output, SANE_UNSET, OXTABS, 0 )
# endif
#endif
#ifdef BSDLY
MI_ENTRY("bs1", output, SANE_UNSET, BS1, BSDLY)
MI_ENTRY("bs0", output, SANE_SET, BS0, BSDLY)
#endif
#ifdef VTDLY
MI_ENTRY("vt1", output, SANE_UNSET, VT1, VTDLY)
MI_ENTRY("vt0", output, SANE_SET, VT0, VTDLY)
#endif
#ifdef FFDLY
MI_ENTRY("ff1", output, SANE_UNSET, FF1, FFDLY)
MI_ENTRY("ff0", output, SANE_SET, FF0, FFDLY)
#endif
MI_ENTRY("isig", local, SANE_SET | REV, ISIG, 0 )
MI_ENTRY("icanon", local, SANE_SET | REV, ICANON, 0 )
#ifdef IEXTEN
MI_ENTRY("iexten", local, SANE_SET | REV, IEXTEN, 0 )
#endif
MI_ENTRY("echo", local, SANE_SET | REV, ECHO, 0 )
MI_ENTRY("echoe", local, SANE_SET | REV, ECHOE, 0 )
MI_ENTRY("crterase", local, REV | OMIT, ECHOE, 0 )
MI_ENTRY("echok", local, SANE_SET | REV, ECHOK, 0 )
MI_ENTRY("echonl", local, SANE_UNSET | REV, ECHONL, 0 )
MI_ENTRY("noflsh", local, SANE_UNSET | REV, NOFLSH, 0 )
#ifdef XCASE
MI_ENTRY("xcase", local, SANE_UNSET | REV, XCASE, 0 )
#endif
#ifdef TOSTOP
MI_ENTRY("tostop", local, SANE_UNSET | REV, TOSTOP, 0 )
#endif
#ifdef ECHOPRT
MI_ENTRY("echoprt", local, SANE_UNSET | REV, ECHOPRT, 0 )
MI_ENTRY("prterase", local, REV | OMIT, ECHOPRT, 0 )
#endif
#ifdef ECHOCTL
MI_ENTRY("echoctl", local, SANE_SET | REV, ECHOCTL, 0 )
MI_ENTRY("ctlecho", local, REV | OMIT, ECHOCTL, 0 )
#endif
#ifdef ECHOKE
MI_ENTRY("echoke", local, SANE_SET | REV, ECHOKE, 0 )
MI_ENTRY("crtkill", local, REV | OMIT, ECHOKE, 0 )
#endif
;
#undef MI_ENTRY
#define MI_ENTRY(N,T,F,B,M) { T, F, M, B },
static const struct mode_info mode_info[] = {
/* This should be verbatim cut-n-paste copy of the above MI_ENTRYs */
MI_ENTRY("evenp", combination, REV | OMIT, 0, 0 )
MI_ENTRY("parity", combination, REV | OMIT, 0, 0 )
MI_ENTRY("oddp", combination, REV | OMIT, 0, 0 )
MI_ENTRY("nl", combination, REV | OMIT, 0, 0 )
MI_ENTRY("ek", combination, OMIT, 0, 0 )
MI_ENTRY("sane", combination, OMIT, 0, 0 )
MI_ENTRY("cooked", combination, REV | OMIT, 0, 0 )
MI_ENTRY("raw", combination, REV | OMIT, 0, 0 )
MI_ENTRY("pass8", combination, REV | OMIT, 0, 0 )
MI_ENTRY("litout", combination, REV | OMIT, 0, 0 )
MI_ENTRY("cbreak", combination, REV | OMIT, 0, 0 )
MI_ENTRY("crt", combination, OMIT, 0, 0 )
MI_ENTRY("dec", combination, OMIT, 0, 0 )
#ifdef IXANY
MI_ENTRY("decctlq", combination, REV | OMIT, 0, 0 )
#endif
#if defined(TABDLY) || defined(OXTABS)
MI_ENTRY("tabs", combination, REV | OMIT, 0, 0 )
#endif
#if defined(XCASE) && defined(IUCLC) && defined(OLCUC)
MI_ENTRY("lcase", combination, REV | OMIT, 0, 0 )
MI_ENTRY("LCASE", combination, REV | OMIT, 0, 0 )
#endif
MI_ENTRY("parenb", control, REV, PARENB, 0 )
MI_ENTRY("parodd", control, REV, PARODD, 0 )
MI_ENTRY("cs5", control, 0, CS5, CSIZE)
MI_ENTRY("cs6", control, 0, CS6, CSIZE)
MI_ENTRY("cs7", control, 0, CS7, CSIZE)
MI_ENTRY("cs8", control, 0, CS8, CSIZE)
MI_ENTRY("hupcl", control, REV, HUPCL, 0 )
MI_ENTRY("hup", control, REV | OMIT, HUPCL, 0 )
MI_ENTRY("cstopb", control, REV, CSTOPB, 0 )
MI_ENTRY("cread", control, SANE_SET | REV, CREAD, 0 )
MI_ENTRY("clocal", control, REV, CLOCAL, 0 )
#ifdef CRTSCTS
MI_ENTRY("crtscts", control, REV, CRTSCTS, 0 )
#endif
MI_ENTRY("ignbrk", input, SANE_UNSET | REV, IGNBRK, 0 )
MI_ENTRY("brkint", input, SANE_SET | REV, BRKINT, 0 )
MI_ENTRY("ignpar", input, REV, IGNPAR, 0 )
MI_ENTRY("parmrk", input, REV, PARMRK, 0 )
MI_ENTRY("inpck", input, REV, INPCK, 0 )
MI_ENTRY("istrip", input, REV, ISTRIP, 0 )
MI_ENTRY("inlcr", input, SANE_UNSET | REV, INLCR, 0 )
MI_ENTRY("igncr", input, SANE_UNSET | REV, IGNCR, 0 )
MI_ENTRY("icrnl", input, SANE_SET | REV, ICRNL, 0 )
MI_ENTRY("ixon", input, REV, IXON, 0 )
MI_ENTRY("ixoff", input, SANE_UNSET | REV, IXOFF, 0 )
MI_ENTRY("tandem", input, REV | OMIT, IXOFF, 0 )
#ifdef IUCLC
MI_ENTRY("iuclc", input, SANE_UNSET | REV, IUCLC, 0 )
#endif
#ifdef IXANY
MI_ENTRY("ixany", input, SANE_UNSET | REV, IXANY, 0 )
#endif
#ifdef IMAXBEL
MI_ENTRY("imaxbel", input, SANE_SET | REV, IMAXBEL, 0 )
#endif
MI_ENTRY("opost", output, SANE_SET | REV, OPOST, 0 )
#ifdef OLCUC
MI_ENTRY("olcuc", output, SANE_UNSET | REV, OLCUC, 0 )
#endif
#ifdef OCRNL
MI_ENTRY("ocrnl", output, SANE_UNSET | REV, OCRNL, 0 )
#endif
#ifdef ONLCR
MI_ENTRY("onlcr", output, SANE_SET | REV, ONLCR, 0 )
#endif
#ifdef ONOCR
MI_ENTRY("onocr", output, SANE_UNSET | REV, ONOCR, 0 )
#endif
#ifdef ONLRET
MI_ENTRY("onlret", output, SANE_UNSET | REV, ONLRET, 0 )
#endif
#ifdef OFILL
MI_ENTRY("ofill", output, SANE_UNSET | REV, OFILL, 0 )
#endif
#ifdef OFDEL
MI_ENTRY("ofdel", output, SANE_UNSET | REV, OFDEL, 0 )
#endif
#ifdef NLDLY
MI_ENTRY("nl1", output, SANE_UNSET, NL1, NLDLY)
MI_ENTRY("nl0", output, SANE_SET, NL0, NLDLY)
#endif
#ifdef CRDLY
MI_ENTRY("cr3", output, SANE_UNSET, CR3, CRDLY)
MI_ENTRY("cr2", output, SANE_UNSET, CR2, CRDLY)
MI_ENTRY("cr1", output, SANE_UNSET, CR1, CRDLY)
MI_ENTRY("cr0", output, SANE_SET, CR0, CRDLY)
#endif
#ifdef TABDLY
MI_ENTRY("tab3", output, SANE_UNSET, TAB3, TABDLY)
MI_ENTRY("tab2", output, SANE_UNSET, TAB2, TABDLY)
MI_ENTRY("tab1", output, SANE_UNSET, TAB1, TABDLY)
MI_ENTRY("tab0", output, SANE_SET, TAB0, TABDLY)
#else
# ifdef OXTABS
MI_ENTRY("tab3", output, SANE_UNSET, OXTABS, 0 )
# endif
#endif
#ifdef BSDLY
MI_ENTRY("bs1", output, SANE_UNSET, BS1, BSDLY)
MI_ENTRY("bs0", output, SANE_SET, BS0, BSDLY)
#endif
#ifdef VTDLY
MI_ENTRY("vt1", output, SANE_UNSET, VT1, VTDLY)
MI_ENTRY("vt0", output, SANE_SET, VT0, VTDLY)
#endif
#ifdef FFDLY
MI_ENTRY("ff1", output, SANE_UNSET, FF1, FFDLY)
MI_ENTRY("ff0", output, SANE_SET, FF0, FFDLY)
#endif
MI_ENTRY("isig", local, SANE_SET | REV, ISIG, 0 )
MI_ENTRY("icanon", local, SANE_SET | REV, ICANON, 0 )
#ifdef IEXTEN
MI_ENTRY("iexten", local, SANE_SET | REV, IEXTEN, 0 )
#endif
MI_ENTRY("echo", local, SANE_SET | REV, ECHO, 0 )
MI_ENTRY("echoe", local, SANE_SET | REV, ECHOE, 0 )
MI_ENTRY("crterase", local, REV | OMIT, ECHOE, 0 )
MI_ENTRY("echok", local, SANE_SET | REV, ECHOK, 0 )
MI_ENTRY("echonl", local, SANE_UNSET | REV, ECHONL, 0 )
MI_ENTRY("noflsh", local, SANE_UNSET | REV, NOFLSH, 0 )
#ifdef XCASE
MI_ENTRY("xcase", local, SANE_UNSET | REV, XCASE, 0 )
#endif
#ifdef TOSTOP
MI_ENTRY("tostop", local, SANE_UNSET | REV, TOSTOP, 0 )
#endif
#ifdef ECHOPRT
MI_ENTRY("echoprt", local, SANE_UNSET | REV, ECHOPRT, 0 )
MI_ENTRY("prterase", local, REV | OMIT, ECHOPRT, 0 )
#endif
#ifdef ECHOCTL
MI_ENTRY("echoctl", local, SANE_SET | REV, ECHOCTL, 0 )
MI_ENTRY("ctlecho", local, REV | OMIT, ECHOCTL, 0 )
#endif
#ifdef ECHOKE
MI_ENTRY("echoke", local, SANE_SET | REV, ECHOKE, 0 )
MI_ENTRY("crtkill", local, REV | OMIT, ECHOKE, 0 )
#endif
};
enum {
NUM_mode_info = ARRAY_SIZE(mode_info)
};
/* Control characters */
struct control_info {
const uint8_t saneval; /* Value to set for 'stty sane' */
const uint8_t offset; /* Offset in c_cc */
};
enum {
/* Must match control_name[] and control_info[] order! */
CIDX_intr = 0,
CIDX_quit,
CIDX_erase,
CIDX_kill,
CIDX_eof,
CIDX_eol,
#ifdef VEOL2
CIDX_eol2,
#endif
#ifdef VSWTCH
CIDX_swtch,
#endif
CIDX_start,
CIDX_stop,
CIDX_susp,
#ifdef VDSUSP
CIDX_dsusp,
#endif
#ifdef VREPRINT
CIDX_rprnt,
#endif
#ifdef VWERASE
CIDX_werase,
#endif
#ifdef VLNEXT
CIDX_lnext,
#endif
#ifdef VFLUSHO
CIDX_flush,
#endif
#ifdef VSTATUS
CIDX_status,
#endif
CIDX_min,
CIDX_time,
};
#define CI_ENTRY(n,s,o) n "\0"
/* Name given on command line */
static const char control_name[] =
CI_ENTRY("intr", CINTR, VINTR )
CI_ENTRY("quit", CQUIT, VQUIT )
CI_ENTRY("erase", CERASE, VERASE )
CI_ENTRY("kill", CKILL, VKILL )
CI_ENTRY("eof", CEOF, VEOF )
CI_ENTRY("eol", CEOL, VEOL )
#ifdef VEOL2
CI_ENTRY("eol2", CEOL2, VEOL2 )
#endif
#ifdef VSWTCH
CI_ENTRY("swtch", CSWTCH, VSWTCH )
#endif
CI_ENTRY("start", CSTART, VSTART )
CI_ENTRY("stop", CSTOP, VSTOP )
CI_ENTRY("susp", CSUSP, VSUSP )
#ifdef VDSUSP
CI_ENTRY("dsusp", CDSUSP, VDSUSP )
#endif
#ifdef VREPRINT
CI_ENTRY("rprnt", CRPRNT, VREPRINT)
#endif
#ifdef VWERASE
CI_ENTRY("werase", CWERASE, VWERASE )
#endif
#ifdef VLNEXT
CI_ENTRY("lnext", CLNEXT, VLNEXT )
#endif
#ifdef VFLUSHO
CI_ENTRY("flush", CFLUSHO, VFLUSHO )
#endif
#ifdef VSTATUS
CI_ENTRY("status", CSTATUS, VSTATUS )
#endif
/* These must be last because of the display routines */
CI_ENTRY("min", 1, VMIN )
CI_ENTRY("time", 0, VTIME )
;
#undef CI_ENTRY
#define CI_ENTRY(n,s,o) { s, o },
static const struct control_info control_info[] = {
/* This should be verbatim cut-n-paste copy of the above CI_ENTRYs */
CI_ENTRY("intr", CINTR, VINTR )
CI_ENTRY("quit", CQUIT, VQUIT )
CI_ENTRY("erase", CERASE, VERASE )
CI_ENTRY("kill", CKILL, VKILL )
CI_ENTRY("eof", CEOF, VEOF )
CI_ENTRY("eol", CEOL, VEOL )
#ifdef VEOL2
CI_ENTRY("eol2", CEOL2, VEOL2 )
#endif
#ifdef VSWTCH
CI_ENTRY("swtch", CSWTCH, VSWTCH )
#endif
CI_ENTRY("start", CSTART, VSTART )
CI_ENTRY("stop", CSTOP, VSTOP )
CI_ENTRY("susp", CSUSP, VSUSP )
#ifdef VDSUSP
CI_ENTRY("dsusp", CDSUSP, VDSUSP )
#endif
#ifdef VREPRINT
CI_ENTRY("rprnt", CRPRNT, VREPRINT)
#endif
#ifdef VWERASE
CI_ENTRY("werase", CWERASE, VWERASE )
#endif
#ifdef VLNEXT
CI_ENTRY("lnext", CLNEXT, VLNEXT )
#endif
#ifdef VFLUSHO
CI_ENTRY("flush", CFLUSHO, VFLUSHO )
#endif
#ifdef VSTATUS
CI_ENTRY("status", CSTATUS, VSTATUS )
#endif
/* These must be last because of the display routines */
CI_ENTRY("min", 1, VMIN )
CI_ENTRY("time", 0, VTIME )
};
enum {
NUM_control_info = ARRAY_SIZE(control_info)
};
struct globals {
const char *device_name;
/* The width of the screen, for output wrapping */
unsigned max_col;
/* Current position, to know when to wrap */
unsigned current_col;
char buf[10];
} FIX_ALIASING;
#define G (*(struct globals*)&bb_common_bufsiz1)
#define INIT_G() do { \
G.device_name = bb_msg_standard_input; \
G.max_col = 80; \
} while (0)
/* Return a string that is the printable representation of character CH */
/* Adapted from 'cat' by Torbjorn Granlund */
static const char *visible(unsigned ch)
{
char *bpout = G.buf;
if (ch == _POSIX_VDISABLE)
return "<undef>";
if (ch >= 128) {
ch -= 128;
*bpout++ = 'M';
*bpout++ = '-';
}
if (ch < 32) {
*bpout++ = '^';
*bpout++ = ch + 64;
} else if (ch < 127) {
*bpout++ = ch;
} else {
*bpout++ = '^';
*bpout++ = '?';
}
*bpout = '\0';
return G.buf;
}
static tcflag_t *mode_type_flag(unsigned type, const struct termios *mode)
{
static const uint8_t tcflag_offsets[] ALIGN1 = {
offsetof(struct termios, c_cflag), /* control */
offsetof(struct termios, c_iflag), /* input */
offsetof(struct termios, c_oflag), /* output */
offsetof(struct termios, c_lflag) /* local */
};
if (type <= local) {
return (tcflag_t*) (((char*)mode) + tcflag_offsets[type]);
}
return NULL;
}
static void set_speed_or_die(enum speed_setting type, const char *arg,
struct termios *mode)
{
speed_t baud;
baud = tty_value_to_baud(xatou(arg));
if (type != output_speed) { /* either input or both */
cfsetispeed(mode, baud);
}
if (type != input_speed) { /* either output or both */
cfsetospeed(mode, baud);
}
}
static NORETURN void perror_on_device_and_die(const char *fmt)
{
bb_perror_msg_and_die(fmt, G.device_name);
}
static void perror_on_device(const char *fmt)
{
bb_perror_msg(fmt, G.device_name);
}
/* Print format string MESSAGE and optional args.
Wrap to next line first if it won't fit.
Print a space first unless MESSAGE will start a new line */
static void wrapf(const char *message, ...)
{
char buf[128];
va_list args;
unsigned buflen;
va_start(args, message);
buflen = vsnprintf(buf, sizeof(buf), message, args);
va_end(args);
/* We seem to be called only with suitable lengths, but check if
somebody failed to adhere to this assumption just to be sure. */
if (!buflen || buflen >= sizeof(buf)) return;
if (G.current_col > 0) {
G.current_col++;
if (buf[0] != '\n') {
if (G.current_col + buflen >= G.max_col) {
bb_putchar('\n');
G.current_col = 0;
} else
bb_putchar(' ');
}
}
fputs(buf, stdout);
G.current_col += buflen;
if (buf[buflen-1] == '\n')
G.current_col = 0;
}
static void newline(void)
{
if (G.current_col != 0)
wrapf("\n");
}
static void set_window_size(int rows, int cols)
{
struct winsize win = { 0, 0, 0, 0 };
if (ioctl(STDIN_FILENO, TIOCGWINSZ, &win)) {
if (errno != EINVAL) {
goto bail;
}
memset(&win, 0, sizeof(win));
}
if (rows >= 0)
win.ws_row = rows;
if (cols >= 0)
win.ws_col = cols;
if (ioctl(STDIN_FILENO, TIOCSWINSZ, (char *) &win))
bail:
perror_on_device("%s");
}
static void display_window_size(int fancy)
{
const char *fmt_str = "%s\0%s: no size information for this device";
unsigned width, height;
if (get_terminal_width_height(STDIN_FILENO, &width, &height)) {
if ((errno != EINVAL) || ((fmt_str += 2), !fancy)) {
perror_on_device(fmt_str);
}
} else {
wrapf(fancy ? "rows %u; columns %u;" : "%u %u\n",
height, width);
}
}
static const struct suffix_mult stty_suffixes[] = {
{ "b", 512 },
{ "k", 1024 },
{ "B", 1024 },
{ "", 0 }
};
static const struct mode_info *find_mode(const char *name)
{
int i = index_in_strings(mode_name, name);
return i >= 0 ? &mode_info[i] : NULL;
}
static const struct control_info *find_control(const char *name)
{
int i = index_in_strings(control_name, name);
return i >= 0 ? &control_info[i] : NULL;
}
enum {
param_need_arg = 0x80,
param_line = 1 | 0x80,
param_rows = 2 | 0x80,
param_cols = 3 | 0x80,
param_columns = 4 | 0x80,
param_size = 5,
param_speed = 6,
param_ispeed = 7 | 0x80,
param_ospeed = 8 | 0x80,
};
static int find_param(const char *name)
{
static const char params[] ALIGN1 =
"line\0" /* 1 */
"rows\0" /* 2 */
"cols\0" /* 3 */
"columns\0" /* 4 */
"size\0" /* 5 */
"speed\0" /* 6 */
"ispeed\0"
"ospeed\0";
int i = index_in_strings(params, name) + 1;
if (i == 0)
return 0;
if (i != 5 && i != 6)
i |= 0x80;
return i;
}
static int recover_mode(const char *arg, struct termios *mode)
{
int i, n;
unsigned chr;
unsigned long iflag, oflag, cflag, lflag;
/* Scan into temporaries since it is too much trouble to figure out
the right format for 'tcflag_t' */
if (sscanf(arg, "%lx:%lx:%lx:%lx%n",
&iflag, &oflag, &cflag, &lflag, &n) != 4)
return 0;
mode->c_iflag = iflag;
mode->c_oflag = oflag;
mode->c_cflag = cflag;
mode->c_lflag = lflag;
arg += n;
for (i = 0; i < NCCS; ++i) {
if (sscanf(arg, ":%x%n", &chr, &n) != 1)
return 0;
mode->c_cc[i] = chr;
arg += n;
}
/* Fail if there are too many fields */
if (*arg != '\0')
return 0;
return 1;
}
static void display_recoverable(const struct termios *mode,
int UNUSED_PARAM dummy)
{
int i;
printf("%lx:%lx:%lx:%lx",
(unsigned long) mode->c_iflag, (unsigned long) mode->c_oflag,
(unsigned long) mode->c_cflag, (unsigned long) mode->c_lflag);
for (i = 0; i < NCCS; ++i)
printf(":%x", (unsigned int) mode->c_cc[i]);
bb_putchar('\n');
}
static void display_speed(const struct termios *mode, int fancy)
{
//____________________ 01234567 8 9
const char *fmt_str = "%lu %lu\n\0ispeed %lu baud; ospeed %lu baud;";
unsigned long ispeed, ospeed;
ospeed = ispeed = cfgetispeed(mode);
if (ispeed == 0 || ispeed == (ospeed = cfgetospeed(mode))) {
ispeed = ospeed; /* in case ispeed was 0 */
//________ 0123 4 5 6 7 8 9
fmt_str = "%lu\n\0\0\0\0\0speed %lu baud;";
}
if (fancy) fmt_str += 9;
wrapf(fmt_str, tty_baud_to_value(ispeed), tty_baud_to_value(ospeed));
}
static void do_display(const struct termios *mode, int all)
{
int i;
tcflag_t *bitsp;
unsigned long mask;
int prev_type = control;
display_speed(mode, 1);
if (all)
display_window_size(1);
#ifdef HAVE_C_LINE
wrapf("line = %u;\n", mode->c_line);
#else
newline();
#endif
for (i = 0; i != CIDX_min; ++i) {
/* If swtch is the same as susp, don't print both */
#if VSWTCH == VSUSP
if (i == CIDX_swtch)
continue;
#endif
/* If eof uses the same slot as min, only print whichever applies */
#if VEOF == VMIN
if (!(mode->c_lflag & ICANON)
&& (i == CIDX_eof || i == CIDX_eol)
) {
continue;
}
#endif
wrapf("%s = %s;", nth_string(control_name, i),
visible(mode->c_cc[control_info[i].offset]));
}
#if VEOF == VMIN
if ((mode->c_lflag & ICANON) == 0)
#endif
wrapf("min = %u; time = %u;", mode->c_cc[VMIN], mode->c_cc[VTIME]);
newline();
for (i = 0; i < NUM_mode_info; ++i) {
if (mode_info[i].flags & OMIT)
continue;
if (mode_info[i].type != prev_type) {
newline();
prev_type = mode_info[i].type;
}
bitsp = mode_type_flag(mode_info[i].type, mode);
mask = mode_info[i].mask ? mode_info[i].mask : mode_info[i].bits;
if ((*bitsp & mask) == mode_info[i].bits) {
if (all || (mode_info[i].flags & SANE_UNSET))
wrapf("-%s"+1, nth_string(mode_name, i));
} else {
if ((all && mode_info[i].flags & REV)
|| (!all && (mode_info[i].flags & (SANE_SET | REV)) == (SANE_SET | REV))
) {
wrapf("-%s", nth_string(mode_name, i));
}
}
}
newline();
}
static void sane_mode(struct termios *mode)
{
int i;
tcflag_t *bitsp;
for (i = 0; i < NUM_control_info; ++i) {
#if VMIN == VEOF
if (i == CIDX_min)
break;
#endif
mode->c_cc[control_info[i].offset] = control_info[i].saneval;
}
for (i = 0; i < NUM_mode_info; ++i) {
if (mode_info[i].flags & SANE_SET) {
bitsp = mode_type_flag(mode_info[i].type, mode);
*bitsp = (*bitsp & ~((unsigned long)mode_info[i].mask))
| mode_info[i].bits;
} else if (mode_info[i].flags & SANE_UNSET) {
bitsp = mode_type_flag(mode_info[i].type, mode);
*bitsp = *bitsp & ~((unsigned long)mode_info[i].mask)
& ~mode_info[i].bits;
}
}
}
/* Save set_mode from #ifdef forest plague */
#ifndef ONLCR
#define ONLCR 0
#endif
#ifndef OCRNL
#define OCRNL 0
#endif
#ifndef ONLRET
#define ONLRET 0
#endif
#ifndef XCASE
#define XCASE 0
#endif
#ifndef IXANY
#define IXANY 0
#endif
#ifndef TABDLY
#define TABDLY 0
#endif
#ifndef OXTABS
#define OXTABS 0
#endif
#ifndef IUCLC
#define IUCLC 0
#endif
#ifndef OLCUC
#define OLCUC 0
#endif
#ifndef ECHOCTL
#define ECHOCTL 0
#endif
#ifndef ECHOKE
#define ECHOKE 0
#endif
static void set_mode(const struct mode_info *info, int reversed,
struct termios *mode)
{
tcflag_t *bitsp;
bitsp = mode_type_flag(info->type, mode);
if (bitsp) {
if (reversed)
*bitsp = *bitsp & ~info->mask & ~info->bits;
else
*bitsp = (*bitsp & ~info->mask) | info->bits;
return;
}
/* Combination mode */
if (info == &mode_info[IDX_evenp] || info == &mode_info[IDX_parity]) {
if (reversed)
mode->c_cflag = (mode->c_cflag & ~PARENB & ~CSIZE) | CS8;
else
mode->c_cflag = (mode->c_cflag & ~PARODD & ~CSIZE) | PARENB | CS7;
} else if (info == &mode_info[IDX_oddp]) {
if (reversed)
mode->c_cflag = (mode->c_cflag & ~PARENB & ~CSIZE) | CS8;
else
mode->c_cflag = (mode->c_cflag & ~CSIZE) | CS7 | PARODD | PARENB;
} else if (info == &mode_info[IDX_nl]) {
if (reversed) {
mode->c_iflag = (mode->c_iflag | ICRNL) & ~INLCR & ~IGNCR;
mode->c_oflag = (mode->c_oflag | ONLCR) & ~OCRNL & ~ONLRET;
} else {
mode->c_iflag = mode->c_iflag & ~ICRNL;
if (ONLCR) mode->c_oflag = mode->c_oflag & ~ONLCR;
}
} else if (info == &mode_info[IDX_ek]) {
mode->c_cc[VERASE] = CERASE;
mode->c_cc[VKILL] = CKILL;
} else if (info == &mode_info[IDX_sane]) {
sane_mode(mode);
} else if (info == &mode_info[IDX_cbreak]) {
if (reversed)
mode->c_lflag |= ICANON;
else
mode->c_lflag &= ~ICANON;
} else if (info == &mode_info[IDX_pass8]) {
if (reversed) {
mode->c_cflag = (mode->c_cflag & ~CSIZE) | CS7 | PARENB;
mode->c_iflag |= ISTRIP;
} else {
mode->c_cflag = (mode->c_cflag & ~PARENB & ~CSIZE) | CS8;
mode->c_iflag &= ~ISTRIP;
}
} else if (info == &mode_info[IDX_litout]) {
if (reversed) {
mode->c_cflag = (mode->c_cflag & ~CSIZE) | CS7 | PARENB;
mode->c_iflag |= ISTRIP;
mode->c_oflag |= OPOST;
} else {
mode->c_cflag = (mode->c_cflag & ~PARENB & ~CSIZE) | CS8;
mode->c_iflag &= ~ISTRIP;
mode->c_oflag &= ~OPOST;
}
} else if (info == &mode_info[IDX_raw] || info == &mode_info[IDX_cooked]) {
if ((info == &mode_info[IDX_raw] && reversed)
|| (info == &mode_info[IDX_cooked] && !reversed)
) {
/* Cooked mode */
mode->c_iflag |= BRKINT | IGNPAR | ISTRIP | ICRNL | IXON;
mode->c_oflag |= OPOST;
mode->c_lflag |= ISIG | ICANON;
#if VMIN == VEOF
mode->c_cc[VEOF] = CEOF;
#endif
#if VTIME == VEOL
mode->c_cc[VEOL] = CEOL;
#endif
} else {
/* Raw mode */
mode->c_iflag = 0;
mode->c_oflag &= ~OPOST;
mode->c_lflag &= ~(ISIG | ICANON | XCASE);
mode->c_cc[VMIN] = 1;
mode->c_cc[VTIME] = 0;
}
}
else if (IXANY && info == &mode_info[IDX_decctlq]) {
if (reversed)
mode->c_iflag |= IXANY;
else
mode->c_iflag &= ~IXANY;
}
else if (TABDLY && info == &mode_info[IDX_tabs]) {
if (reversed)
mode->c_oflag = (mode->c_oflag & ~TABDLY) | TAB3;
else
mode->c_oflag = (mode->c_oflag & ~TABDLY) | TAB0;
}
else if (OXTABS && info == &mode_info[IDX_tabs]) {
if (reversed)
mode->c_oflag |= OXTABS;
else
mode->c_oflag &= ~OXTABS;
} else
if (XCASE && IUCLC && OLCUC
&& (info == &mode_info[IDX_lcase] || info == &mode_info[IDX_LCASE])
) {
if (reversed) {
mode->c_lflag &= ~XCASE;
mode->c_iflag &= ~IUCLC;
mode->c_oflag &= ~OLCUC;
} else {
mode->c_lflag |= XCASE;
mode->c_iflag |= IUCLC;
mode->c_oflag |= OLCUC;
}
} else if (info == &mode_info[IDX_crt]) {
mode->c_lflag |= ECHOE | ECHOCTL | ECHOKE;
} else if (info == &mode_info[IDX_dec]) {
mode->c_cc[VINTR] = 3; /* ^C */
mode->c_cc[VERASE] = 127; /* DEL */
mode->c_cc[VKILL] = 21; /* ^U */
mode->c_lflag |= ECHOE | ECHOCTL | ECHOKE;
if (IXANY) mode->c_iflag &= ~IXANY;
}
}
static void set_control_char_or_die(const struct control_info *info,
const char *arg, struct termios *mode)
{
unsigned char value;
if (info == &control_info[CIDX_min] || info == &control_info[CIDX_time])
value = xatoul_range_sfx(arg, 0, 0xff, stty_suffixes);
else if (arg[0] == '\0' || arg[1] == '\0')
value = arg[0];
else if (strcmp(arg, "^-") == 0 || strcmp(arg, "undef") == 0)
value = _POSIX_VDISABLE;
else if (arg[0] == '^') { /* Ignore any trailing junk (^Cjunk) */
value = arg[1] & 0x1f; /* Non-letters get weird results */
if (arg[1] == '?')
value = 127;
} else
value = xatoul_range_sfx(arg, 0, 0xff, stty_suffixes);
mode->c_cc[info->offset] = value;
}
#define STTY_require_set_attr (1 << 0)
#define STTY_speed_was_set (1 << 1)
#define STTY_verbose_output (1 << 2)
#define STTY_recoverable_output (1 << 3)
#define STTY_noargs (1 << 4)
int stty_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int stty_main(int argc UNUSED_PARAM, char **argv)
{
struct termios mode;
void (*output_func)(const struct termios *, int);
const char *file_name = NULL;
int display_all = 0;
int stty_state;
int k;
INIT_G();
stty_state = STTY_noargs;
output_func = do_display;
/* First pass: only parse/verify command line params */
k = 0;
while (argv[++k]) {
const struct mode_info *mp;
const struct control_info *cp;
const char *arg = argv[k];
const char *argnext = argv[k+1];
int param;
if (arg[0] == '-') {
int i;
mp = find_mode(arg+1);
if (mp) {
if (!(mp->flags & REV))
goto invalid_argument;
stty_state &= ~STTY_noargs;
continue;
}
/* It is an option - parse it */
i = 0;
while (arg[++i]) {
switch (arg[i]) {
case 'a':
stty_state |= STTY_verbose_output;
output_func = do_display;
display_all = 1;
break;
case 'g':
stty_state |= STTY_recoverable_output;
output_func = display_recoverable;
break;
case 'F':
if (file_name)
bb_error_msg_and_die("only one device may be specified");
file_name = &arg[i+1]; /* "-Fdevice" ? */
if (!file_name[0]) { /* nope, "-F device" */
int p = k+1; /* argv[p] is argnext */
file_name = argnext;
if (!file_name)
bb_error_msg_and_die(bb_msg_requires_arg, "-F");
/* remove -F param from arg[vc] */
while (argv[p]) {
argv[p] = argv[p+1];
++p;
}
}
goto end_option;
default:
goto invalid_argument;
}
}
end_option:
continue;
}
mp = find_mode(arg);
if (mp) {
stty_state &= ~STTY_noargs;
continue;
}
cp = find_control(arg);
if (cp) {
if (!argnext)
bb_error_msg_and_die(bb_msg_requires_arg, arg);
/* called for the side effect of xfunc death only */
set_control_char_or_die(cp, argnext, &mode);
stty_state &= ~STTY_noargs;
++k;
continue;
}
param = find_param(arg);
if (param & param_need_arg) {
if (!argnext)
bb_error_msg_and_die(bb_msg_requires_arg, arg);
++k;
}
switch (param) {
#ifdef HAVE_C_LINE
case param_line:
# ifndef TIOCGWINSZ
xatoul_range_sfx(argnext, 1, INT_MAX, stty_suffixes);
break;
# endif /* else fall-through */
#endif
#ifdef TIOCGWINSZ
case param_rows:
case param_cols:
case param_columns:
xatoul_range_sfx(argnext, 1, INT_MAX, stty_suffixes);
break;
case param_size:
#endif
case param_speed:
break;
case param_ispeed:
/* called for the side effect of xfunc death only */
set_speed_or_die(input_speed, argnext, &mode);
break;
case param_ospeed:
/* called for the side effect of xfunc death only */
set_speed_or_die(output_speed, argnext, &mode);
break;
default:
if (recover_mode(arg, &mode) == 1) break;
if (tty_value_to_baud(xatou(arg)) != (speed_t) -1) break;
invalid_argument:
bb_error_msg_and_die("invalid argument '%s'", arg);
}
stty_state &= ~STTY_noargs;
}
/* Specifying both -a and -g is an error */
if ((stty_state & (STTY_verbose_output | STTY_recoverable_output)) ==
(STTY_verbose_output | STTY_recoverable_output))
bb_error_msg_and_die("verbose and stty-readable output styles are mutually exclusive");
/* Specifying -a or -g with non-options is an error */
if (!(stty_state & STTY_noargs)
&& (stty_state & (STTY_verbose_output | STTY_recoverable_output))
) {
bb_error_msg_and_die("modes may not be set when specifying an output style");
}
/* Now it is safe to start doing things */
if (file_name) {
G.device_name = file_name;
xmove_fd(xopen_nonblocking(G.device_name), STDIN_FILENO);
ndelay_off(STDIN_FILENO);
}
/* Initialize to all zeroes so there is no risk memcmp will report a
spurious difference in an uninitialized portion of the structure */
memset(&mode, 0, sizeof(mode));
if (tcgetattr(STDIN_FILENO, &mode))
perror_on_device_and_die("%s");
if (stty_state & (STTY_verbose_output | STTY_recoverable_output | STTY_noargs)) {
get_terminal_width_height(STDOUT_FILENO, &G.max_col, NULL);
output_func(&mode, display_all);
return EXIT_SUCCESS;
}
/* Second pass: perform actions */
k = 0;
while (argv[++k]) {
const struct mode_info *mp;
const struct control_info *cp;
const char *arg = argv[k];
const char *argnext = argv[k+1];
int param;
if (arg[0] == '-') {
mp = find_mode(arg+1);
if (mp) {
set_mode(mp, 1 /* reversed */, &mode);
stty_state |= STTY_require_set_attr;
}
/* It is an option - already parsed. Skip it */
continue;
}
mp = find_mode(arg);
if (mp) {
set_mode(mp, 0 /* non-reversed */, &mode);
stty_state |= STTY_require_set_attr;
continue;
}
cp = find_control(arg);
if (cp) {
++k;
set_control_char_or_die(cp, argnext, &mode);
stty_state |= STTY_require_set_attr;
continue;
}
param = find_param(arg);
if (param & param_need_arg) {
++k;
}
switch (param) {
#ifdef HAVE_C_LINE
case param_line:
mode.c_line = xatoul_sfx(argnext, stty_suffixes);
stty_state |= STTY_require_set_attr;
break;
#endif
#ifdef TIOCGWINSZ
case param_cols:
case param_columns:
set_window_size(-1, xatoul_sfx(argnext, stty_suffixes));
break;
case param_size:
display_window_size(0);
break;
case param_rows:
set_window_size(xatoul_sfx(argnext, stty_suffixes), -1);
break;
#endif
case param_speed:
display_speed(&mode, 0);
break;
case param_ispeed:
set_speed_or_die(input_speed, argnext, &mode);
stty_state |= (STTY_require_set_attr | STTY_speed_was_set);
break;
case param_ospeed:
set_speed_or_die(output_speed, argnext, &mode);
stty_state |= (STTY_require_set_attr | STTY_speed_was_set);
break;
default:
if (recover_mode(arg, &mode) == 1)
stty_state |= STTY_require_set_attr;
else /* true: if (tty_value_to_baud(xatou(arg)) != (speed_t) -1) */{
set_speed_or_die(both_speeds, arg, &mode);
stty_state |= (STTY_require_set_attr | STTY_speed_was_set);
} /* else - impossible (caught in the first pass):
bb_error_msg_and_die("invalid argument '%s'", arg); */
}
}
if (stty_state & STTY_require_set_attr) {
struct termios new_mode;
if (tcsetattr(STDIN_FILENO, TCSADRAIN, &mode))
perror_on_device_and_die("%s");
/* POSIX (according to Zlotnick's book) tcsetattr returns zero if
it performs *any* of the requested operations. This means it
can report 'success' when it has actually failed to perform
some proper subset of the requested operations. To detect
this partial failure, get the current terminal attributes and
compare them to the requested ones */
/* Initialize to all zeroes so there is no risk memcmp will report a
spurious difference in an uninitialized portion of the structure */
memset(&new_mode, 0, sizeof(new_mode));
if (tcgetattr(STDIN_FILENO, &new_mode))
perror_on_device_and_die("%s");
if (memcmp(&mode, &new_mode, sizeof(mode)) != 0) {
#ifdef CIBAUD
/* SunOS 4.1.3 (at least) has the problem that after this sequence,
tcgetattr (&m1); tcsetattr (&m1); tcgetattr (&m2);
sometimes (m1 != m2). The only difference is in the four bits
of the c_cflag field corresponding to the baud rate. To save
Sun users a little confusion, don't report an error if this
happens. But suppress the error only if we haven't tried to
set the baud rate explicitly -- otherwise we'd never give an
error for a true failure to set the baud rate */
new_mode.c_cflag &= (~CIBAUD);
if ((stty_state & STTY_speed_was_set)
|| memcmp(&mode, &new_mode, sizeof(mode)) != 0)
#endif
perror_on_device_and_die("%s: cannot perform all requested operations");
}
}
return EXIT_SUCCESS;
}
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