common/scripts/shcalc.sh

#!/usr/bin/ksh93

#
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#
# Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
#

#
# shcalc - small shell-based calculator
#

# Solaris needs /usr/xpg6/bin:/usr/xpg4/bin because the tools in /usr/bin are not POSIX-conformant
export PATH=/usr/xpg6/bin:/usr/xpg4/bin:/bin:/usr/bin

# Make sure all math stuff runs in the "C" locale to avoid problems
# with alternative # radix point representations (e.g. ',' instead of
# '.' in de_DE.*-locales). This needs to be set _before_ any
# floating-point constants are defined in this script).
if [[ "${LC_ALL}" != "" ]] ; then
    export \
        LC_MONETARY="${LC_ALL}" \
        LC_MESSAGES="${LC_ALL}" \
        LC_COLLATE="${LC_ALL}" \
        LC_CTYPE="${LC_ALL}"
        unset LC_ALL
fi
export LC_NUMERIC=C

function fatal_error
{
    print -u2 "${progname}: $*"
    exit 1
}

function do_calculate
{
    typeset calcline="$1"
    float x=0.0

    printf "(( x=( %s ) ))\n" "${calcline}" | source /dev/stdin
    if (( $? != 0 )) ; then
        print -f $"%s: Syntax error in %s\n" "${progname}" "${calcline}"
        return 1
    fi

    printf "%s == %.40g\n" "${calcline}" x

    return 0
}

function usage
{
    OPTIND=0
    getopts -a "${progname}" "${shcalc_usage}" OPT '-?'
    exit 2
}

# program start
# (be carefull with builtins here - they are unconditionally available
# in the shell's "restricted" mode)
builtin basename
builtin sum

typeset progname="${ basename "${0}" ; }"

typeset -r shcalc_usage=$'+
[-?\n@(#)\$Id: shcalc (Roland Mainz) 2008-11-03 \$\n]
[-author?Roland Mainz <roland.mainz@nrubsig.org>]
[+NAME?shcalc - simple shell calculator]
[+DESCRIPTION?\bsshcalc\b is a small calculator application which
    prints the results of ISO C99 math expressions read from either
    arguments or stdin if no arguments are given.]
[+SEE ALSO?\bksh93\b(1),\bceil\b(3M), \bcopysign\b(3M), \bcos\b(3M),
    \bcosh\b(3M), \berf\b(3M), \berfc\b(3M), \bexp\b(3M),
    \bexp2\b(3M), \bexpm1\b(3M), \bfabs abs\b(3M), \bfdim\b(3M),
    \bfinite\b(3M), \bfloor int\b(3M), \bfma\b(3M), \bfmax\b(3M), \bfmin\b(3M),
    \bfmod\b(3M), \bfpclassify\b(3M), \bhypot\b(3M), \bilogb\b(3M),
    \bisfinite\b(3M), \bisgreater\b(3M), \bisgreaterequal\b(3M), \bisinf\b(3M),
    \bisless\b(3M), \bislessequal\b(3M), \bislessgreater\b(3M), \bisnan\b(3M),
    \bisnormal\b(3M), \bissubnormal\b(3M), \bisunordered\b(3M), \biszero\b(3M),
    \blgamma\b(3M), \blog\b(3M), \blog1p\b(3M), \blog2\b(3M),
    \blogb\b(3M), \bnearbyint\b(3M), \bnextafter\b(3M), \bnexttoward\b(3M),
    \bpow\b(3M), \bremainder\b(3M), \brint\b(3M), \bround\b(3M),
    \bscalb\b(3M), \bscalbn\b(3M), \bsignbit\b(3M), \bsin\b(3M),
    \bsinh\b(3M), \bsqrt\b(3M), \btan\b(3M), \btanh\b(3M),
    \btgamma\b(3M), \btrunc\b(3M)]
'
while getopts -a "${progname}" "${shcalc_usage}" OPT ; do
#   printmsg "## OPT=|${OPT}|, OPTARG=|${OPTARG}|"
    case ${OPT} in
        *)  usage ;;
    esac
done
shift $((OPTIND-1))

integer res

if (( $# == 0 )) ; then
    # No arguments ? Switch to interactive mode...

    # make sure "read" below uses "gmacs"-like editor keys and "multiline" mode

    set -o gmacs
    set -o multiline

    while read "calcline?calc> " ; do
        # quit ?
        [[ "${calcline}" == ~(Elri)(exit|quit|eof) ]] && break

        # empty line ?
        [[ "${calcline}" == ~(Elri)([[:space:]]*) ]] && continue

        do_calculate "$calcline"
        (( res=$? ))
    done

    exit ${res}
else
    while (( $# > 0 )) ; do
        do_calculate "$1"
        (( res=$? ))
        shift
    done

    exit ${res}
fi

# not reached

# EOF.