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Import brltty
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Vladimir Serbinenko committed
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#!/bin/sh
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###############################################################################
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# BRLTTY - A background process providing access to the console screen (when in
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# text mode) for a blind person using a refreshable braille display.
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#
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# Copyright (C) 1995-2012 by The BRLTTY Developers.
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#
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# BRLTTY comes with ABSOLUTELY NO WARRANTY.
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#
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# This is free software, placed under the terms of the
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# GNU General Public License, as published by the Free Software
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# Foundation; either version 2 of the License, or (at your option) any
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# later version. Please see the file LICENSE-GPL for details.
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#
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# Web Page: http://mielke.cc/brltty/
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#
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# This software is maintained by Dave Mielke <dave@mielke.cc>.
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###############################################################################
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# Convert the boot parameter to configuration file directives.
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# If /proc is mounted then use the brltty= boot parameter in /proc/cmdline.
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# If /proc is not mounted then use the brltty environment variable.
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# Invoke with -h for usage information.
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programName="${0##*/}"
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programMessage()
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{
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echo 2>&1 "${programName}: ${1}"
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}
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syntaxError()
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{
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programMessage "${1}"
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exit 2
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}
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internalError()
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{
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programMessage "${1}"
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exit 3
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}
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configurationFile=""
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requestedAction=create
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deviceTranslation=none
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requestedParameter=""
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OPTIND=1
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while getopts ":f:cundop:h" option
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do
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case "${option}"
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in
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f) configurationFile="${OPTARG}";;
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c) requestedAction=create;;
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u) requestedAction=update;;
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n) deviceTranslation=none;;
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d) deviceTranslation=devfs;;
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o) deviceTranslation=old;;
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p) requestedParameter="${OPTARG}";;
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h)
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cat <<EOF
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Usage: ${programName} [option ...]
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-f file The configuration file to create/update.
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-c Create the configuration file (write to stdout if no -f).
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-u Update the configuration file (copying from stdin to stdout if no -f).
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-n Do not translate device paths.
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-d Do old-style to devfs device path translation.
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-o Do devfs to old-style device path translation.
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-p [driver][,[device][,[table]]]
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Explicitly specify the boot parameter.
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-h Display this usage summary.
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EOF
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exit 0
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;;
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\?) syntaxError "unknown option: -${OPTARG}";;
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:) syntaxError "missing value: -${OPTARG}";;
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*) internalError "unimplemented option: -${option}";;
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esac
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done
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shift "`expr $OPTIND - 1`"
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[ "${#}" -eq 0 ] || syntaxError "too many parameters."
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case "${requestedAction}"
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in
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create)
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putConfigurationLine()
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{
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echo "${1}" || exit 4
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}
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startConfigurationFile()
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{
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[ -n "${configurationFile}" ] && exec >"${configurationFile}"
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putConfigurationLine "`makeHeaderLine Created`"
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putConfigurationLine "`makeParameterLine`"
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putConfigurationLine ""
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}
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putConfigurationDirective()
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{
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putConfigurationLine "${1} ${2}"
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}
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finalizeConfigurationFile()
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{
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:
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}
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;;
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update)
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putSedCommand()
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{
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sedScript="${sedScript}
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${1}"
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}
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startConfigurationFile()
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{
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if [ -n "${configurationFile}" ]
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then
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[ -e "${configurationFile}" ] || syntaxError "file not found: ${configurationFile}"
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[ -f "${configurationFile}" ] || syntaxError "not a file: ${configurationFile}"
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[ -r "${configurationFile}" ] || syntaxError "file not readable: ${configurationFile}"
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[ -w "${configurationFile}" ] || syntaxError "file not writable: ${configurationFile}"
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outputFile="${configurationFile}.new"
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exec <"${configurationFile}" >"${outputFile}"
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fi
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sedScript=""
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putSedCommand "1i\\
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`makeHeaderLine Updated`\\
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`makeParameterLine`\\
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"
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}
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putConfigurationDirective()
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{
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value="`echo "${2}" | sed -e 's%\\([/\\]\\)%\\\\\\1%g'`"
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putSedCommand "/^ *#\\(${1} .*\\)/s//\\1/"
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putSedCommand "/^ *\\(${1}\\) .*/s//\\1 ${value}/"
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}
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finalizeConfigurationFile()
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{
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sed -e "${sedScript}"
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[ -n "${outputFile}" ] && mv -f "${outputFile}" "${configurationFile}"
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}
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;;
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*) internalError "unimplemented action: ${requestedAction}";;
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esac
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translateDevice_none()
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{
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:
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}
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translateDevice_devfs()
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{
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minor="${device#ttyS}"
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if [ "${minor}" != "${device}" ]
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then
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device="tts/${minor}"
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return 0
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fi
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minor="${device#lp}"
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if [ "${minor}" != "${device}" ]
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then
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device="printers/${minor}"
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return 0
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fi
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programMessage "unsupported old-style device: ${device}"
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}
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translateDevice_old()
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{
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major="${device%%/*}"
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if [ "${major}" != "${device}" ]
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then
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minor="${device#*/}"
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case "${major}"
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in
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tts) devfs="ttyS${minor}";;
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printers) devfs="lp${minor}";;
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esac
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fi
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if [ -n "${devfs}" ]
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then
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device="${devfs}"
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else
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programMessage "unsupported devfs device: ${device}"
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fi
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}
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makeHeaderLine()
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{
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echo "# ${1} by brltty-bp2cf`date +' on %Y-%m-%d at %H:%M:%S %Z (UTC%z)'`."
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}
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makeParameterLine()
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{
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echo "# Boot Parameter:${bootParameter}"
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}
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putConfigurationFile()
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{
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startConfigurationFile
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[ -n "${brailleDriver}" ] && putConfigurationDirective "braille-driver" "${brailleDriver}"
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[ -n "${brailleDevice}" ] && {
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device="`echo "${brailleDevice}" | sed -e 's%//*%/%g' -e 's%^/dev/%%'`"
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if [ "${device#/}" = "${device}" ]
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then
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translateDevice_${deviceTranslation}
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fi
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putConfigurationDirective "braille-device" "${device}"
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}
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[ -n "${textTable}" ] && putConfigurationDirective "text-table" "${textTable}"
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finalizeConfigurationFile
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}
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parseBootParameter()
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{
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bootParameter="${bootParameter} ${1}"
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number=1
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while [ "${number}" -le 3 ]
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do
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cut="cut -d, -f${number}"
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[ "${number}" -gt 1 ] && cut="${cut} -s"
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operand="`echo ${1} | ${cut}`"
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if [ -n "${operand}" ]
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then
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case "${number}"
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in
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1) brailleDriver="${operand}";;
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2) brailleDevice="${operand}";;
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3) textTable="${operand}";;
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esac
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fi
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number="`expr ${number} + 1`"
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done
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}
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putBootParameter()
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{
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parseBootParameter "${1}"
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putConfigurationFile
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}
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parseBootCommand()
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{
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found=false
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while [ "${#}" -gt 0 ]
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do
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case "${1}"
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in
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"brltty="*)
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found=true
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parseBootParameter "${1#*=}"
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;;
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esac
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shift
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done
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"${found}" && putConfigurationFile
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}
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brailleDriver=""
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brailleDevice=""
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textTable=""
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bootCommandFile="/proc/cmdline"
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if [ -n "${requestedParameter}" ]
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then
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putBootParameter "${requestedParameter}"
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elif [ -f "${bootCommandFile}" ]
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then
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parseBootCommand `cat "${bootCommandFile}"`
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elif [ -n "${brltty}" ]
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then
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putBootParameter "${brltty}"
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fi
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exit 0
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