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# Expect one of a series of regular expressions from $TCP_SESS.
# Can make backreferences to be handled by $match. Returns 0 for
# successful match, 1 for error, 2 for timeout.
#
# This function has no facility for conditionally calling code based
# the regular expression found. This should be done in the calling code
# by testing $TCP_LINE, which contains the line which matched the
# regular expression. The complete set of lines read while waiting for
# this line is available in the array $tcp_expect_lines (including $TCP_LINE
# itself which will be the final element). Alternatively, use -p pind
# which sets $pind to the index of the pattern which matched. It
# will be set to 0 otherwise.
#
# Many of the options are passed straight down to tcp_read.
#
# Options:
# -a Run tcp_expect across all sessions; the first pattern matched
# from any session is used. The TCP output prompt can be
# used to decide which session matched.
# -l list
# Comma-separated list of sessions as for tcp_read.
# -p pv If the Nth of a series of patterns matches, set the parameter
# whose name is given by $pv to N; in the case of a timeout,
# set it to -1; otherwise (unless the function exited prematurely),
# set it to 0.
# To avoid namespace clashes, the parameter's name must
# not begin with `_expect'.
# -P pv This is similar to -p, however in this case the
# arguments to tcp_expect following the options are expected
# to start with a prefix "<tag>:". The parameter $pv is
# then set to the value "<tag>" rather than the numeric
# index of the parameter. The string "timeout" is used
# as the tag for a timeout specified by -t and -T and
# on a failed match the variable is set to the empty string.
# It is not an error for multiple arguments to have
# the same tag or to use a reserved value of the tag.
# -q Quiet, passed down to tcp_read. Bad option and argument
# usage is always reported.
# -s sess
# Expect from session sess. May be repeated for multiple sessions.
# -t to Timeout in seconds (may be floating point) per read operation.
# tcp_expect will only time out if every read operation takes longer
# than to
# -T TO Overall timeout; tcp_expect will time out if the overall operation
# takes longer than this many seconds.
emulate -L zsh
setopt extendedglob
if [[ ${(t)SECONDS} != float* ]]; then
# If called from another function, use that
typeset -F TCP_SECONDS_START=$SECONDS
# Get extra accuracy by making SECONDS floating point locally
typeset -F SECONDS
fi
# Variables are all named _expect_* to avoid problems with the -p param.
local _expect_opt _expect_pvar _expect_state _expect_arg _expect_ind
local -a _expect_read_args
float _expect_to1 _expect_to_all _expect_to _expect_new_to
integer _expect_i _expect_stat _expect_states
while getopts "al:p:P:qs:t:T:" _expect_opt; do
case $_expect_opt in
(a) _expect_read_args+=(-a)
;;
(l) _expect_read_args+=(-l $OPTARG)
;;
([pP]) _expect_pvar=$OPTARG
if [[ $_expect_pvar != [a-zA-Z_][a-zA-Z_0-9]# ]]; then
print "invalid parameter name: $_expect_pvar" >&2
return 1
fi
if [[ $_expect_pvar = _expect* ]]; then
print "$0: parameter names staring \`_expect' are reserved."
return 1
fi
if [[ $_expect_opt = "P" ]]; then
eval "$_expect_pvar=0"
_expect_states=1
else
eval "$_expect_pvar="
fi
;;
(q) _expect_read_args+=(-q)
;;
(s) _expect_read_args+=(-s $OPTARG)
;;
(t) _expect_to1=$OPTARG
;;
(T) _expect_to_all=$(( SECONDS + $OPTARG ))
;;
(\?) return 1
;;
(*) print Unhandled option $_expect_opt, complain >&2
return 1
;;
esac
done
(( OPTIND > 1 )) && shift $(( OPTIND - 1 ))
typeset -ga tcp_expect_lines
tcp_expect_lines=()
while true; do
if (( _expect_to_all || _expect_to1 )); then
_expect_to=0
(( _expect_to1 )) && (( _expect_to = _expect_to1 ))
if (( _expect_to_all )); then
# overall timeout, see if it has already triggered
if (( (_expect_new_to = (_expect_to_all - SECONDS)) <= 0 )); then
[[ -n $_expect_pvar ]] && eval "$_expect_pvar=-1"
return 2
fi
if (( _expect_to <= 0 || _expect_new_to < _expect_to )); then
_expect_to=$_expect_new_to
fi
fi
tcp_read $_expect_read_args -t $_expect_to
_expect_stat=$?
else
tcp_read $_expect_read_args -b
_expect_stat=$?
fi
if (( _expect_stat )); then
[[ -n $_expect_pvar ]] && eval "$_expect_pvar=-1"
return $_expect_stat
fi
tcp_expect_lines+=($TCP_LINE)
for (( _expect_i = 1; _expect_i <= $#; _expect_i++ )); do
if [[ _expect_states -ne 0 && $argv[_expect_i] = (#b)([^:]#):(*) ]]; then
_expect_ind=$match[1]
_expect_arg=$match[2]
else
_expect_ind=$_expect_i
_expect_arg=$argv[_expect_i]
fi
if [[ "$TCP_LINE" = ${~_expect_arg} ]]; then
[[ -n $_expect_pvar ]] && eval "$_expect_pvar=\$_expect_ind"
return 0
fi
done
done
|
