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# Copyright (c) 2017 The NetBSD Foundation, Inc.
# All rights reserved.
#
# This code is derived from software contributed to The NetBSD Foundation
# by Johnny C. Lam.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
# NAME
# echo.subr -- write to standard output through a buffer
#
# SYNOPSIS
# task_echo [-bcn] ...
#
# DESCRIPTION
# The task_echo function provides a buffered output facility. It
# write the contents of the shared buffer to the standard output, then
# writes the operands, separated by a single blank character and
# followed by a newline character, to the standard output.
#
# The options are as follows:
#
# -b Write the operands into a shared buffer instead of to the
# standard output.
#
# -c Clear the contents of the shared buffer before writing the
# operands.
#
# -n Do not write the trailing newline character.
#
# RETURN VALUES
# Returns 0 on success, and >0 if an error occurs.
#
# ENVIRONMENT
# The following variables are used if they are set:
#
# TASK_LOGFILE
# The location of the log file for appending a duplicate of
# the output. If this variable is unset or empty, then no log
# output is written.
#
# EXAMPLES
# task_echo -bcn "Only write this if there is at least one argument:"
# for arg; do
# task_echo " $arg"
# done
#
__task_echo__="yes"
task_load tee
task_echo()
{
: ${TASK_LOGFILE:=}
local action="echo"
local newline="
"
local arg
local OPTIND=1
while getopts ":bcn" arg "$@"; do
case $arg in
b) action="buffer" ;;
c) __task_echo_buffer__= ;;
n) newline= ;;
*) echo 1>&2 "${0##*/}: task_echo: unknown option \`$arg'" ;;
esac
done
shift $(( ${OPTIND} - 1 ))
case $action in
buffer) case $newline in
"") __task_echo_buffer__="$__task_echo_buffer__""$@" ;;
*) __task_echo_buffer__="$__task_echo_buffer__""$@""$newline" ;;
esac ;;
echo) case ${TASK_LOGFILE} in
"") case $newline in
"") echo -n "$__task_echo_buffer__""$@" ;;
*) echo "$__task_echo_buffer__""$@" ;;
esac ;;
*) case $newline in
"") echo -n "$__task_echo_buffer__""$@" ;;
*) echo "$__task_echo_buffer__""$@" ;;
esac | task_tee -a "${TASK_LOGFILE}" ;;
esac
__task_echo_buffer__= ;;
esac
return 0
}
# Static variable to hold the buffered output.
__task_echo_buffer__=
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