basic-1

实战Linux编程的原代码,希望对学驱动的人能有所帮助

#! /bin/sh
# Make sure stty can parse most of its options.

if test "$VERBOSE" = yes; then
  set -x
  stty --version
fi

# Make sure there's a tty on stdin.
. $srcdir/../input-tty

# The following list of reversible options was generated with
# grep -w REV stty.c|sed -n '/^  {"/{s//REV_/;s/".*/=1/;p;}'|fmt
REV_parenb=1 REV_parodd=1 REV_hupcl=1 REV_hup=1 REV_cstopb=1 REV_cread=1
REV_clocal=1 REV_crtscts=1 REV_ignbrk=1 REV_brkint=1 REV_ignpar=1
REV_parmrk=1 REV_inpck=1 REV_istrip=1 REV_inlcr=1 REV_igncr=1 REV_icrnl=1
REV_ixon=1 REV_ixoff=1 REV_tandem=1 REV_iuclc=1 REV_ixany=1 REV_imaxbel=1
REV_opost=1 REV_olcuc=1 REV_ocrnl=1 REV_onlcr=1 REV_onocr=1 REV_onlret=1
REV_ofill=1 REV_ofdel=1 REV_isig=1 REV_icanon=1 REV_iexten=1 REV_echo=1
REV_echoe=1 REV_crterase=1 REV_echok=1 REV_echonl=1 REV_noflsh=1
REV_xcase=1 REV_tostop=1 REV_echoprt=1 REV_prterase=1 REV_echoctl=1
REV_ctlecho=1 REV_echoke=1 REV_crtkill=1 REV_evenp=1 REV_parity=1
REV_oddp=1 REV_nl=1 REV_cooked=1 REV_raw=1 REV_pass8=1 REV_litout=1
REV_cbreak=1 REV_decctlq=1 REV_tabs=1 REV_lcase=1 REV_LCASE=1

fail=0

saved_state=.saved-state
stty --save > $saved_state || fail=1
stty `cat $saved_state` || fail=1

# This would segfault prior to sh-utils-2.0j.
stty erase -

# Build a list of all boolean options stty accepts on this system.
options=`stty -a|tail -n +2|tr ';' '\012'|sed '/ = /d;s/^ //;s/-//g'`

# Take them one at a time, with and without the leading `-'.
for opt in $options; do
  # `stty parenb' and `stty -parenb' fail with this message
  # stty: standard input: unable to perform all requested operations
  # on Linux 2.2.0-pre4 kernels, so skip those tests.
  test $opt = parenb && continue
  stty $opt || fail=1

  # Likewise, `stty -cread' would fail, so skip that, too.
  test $opt = cread && continue
  rev=`eval echo "\\\$REV_$opt"`
  if test -n "$rev"; then
    stty -$opt || { fail=1; echo -$opt; }
  fi
done

if test -n "$RUN_LONG_TESTS"; then
  # Take them in pairs.
  for opt1 in $options; do
    echo .|tr -d '\012'
    for opt2 in $options; do

      stty $opt1 $opt2 || fail=1

      rev1=`eval echo "\\\$REV_$opt1"`
      rev2=`eval echo "\\\$REV_$opt2"`
      if test -n "$rev1"; then
	stty -$opt1 $opt2 || fail=1
      fi
      if test -n "$rev2"; then
	stty $opt1 -$opt2 || fail=1
      fi
      if test "$rev1$rev2" = 11; then
	stty -$opt1 -$opt2 || fail=1
      fi
    done
  done
fi

stty `cat $saved_state`
rm -f $saved_state

exit $fail