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