use C program code as a script.

cas.sh

#!/usr/bin/env bash
# -*- shell-script -*-

# cas - c as script
# A script which support act C language code as a script.
#
# Usage:
#  cas [COMPILE_OPTIONS] [source_file] [EXECUTE_ARGUMENTS]
# the source_file should be appoint otherwise it'll use /dev/stdin automically.
#
# There's a typical way to appoint a c code as a script, just add a 
# `shebang' line at the first line of code, the `cas' will deal this line.
# 
# Please use shebang as:
#    #!/usr/bin/env cas -lm
#
# ------
# Author: Shou Ya([email protected])
# Date: Jan 23, 2012
# Version: 1.0
#





# [ -z "$CC" ] && { CC='gcc'}
CC="/usr/bin/gcc"


arg_1=''
arg_2=''
arg_3=''
function parse_arg {
    until [ -z "$1" ]; do
  [ -f "$1" ] && {
      arg_2=$1; shift
	    arg_3="$@"
	} || {
	    arg_1="$arg_1$IFS$1"
	}
	shift
    done
}

parse_arg "$@"


# [ "$arg_2" = "" ] && arg_2="/dev/stdin"


tmpdir=`mktemp -d`
csource="$arg_2"
[ -z "$csource" ] && target=$tmpdir/tmp || target=$tmpdir/`basename $csource`
comp_log=$tmpdir/comp_log
comp_src=$tmpdir/source.c

function clean_up {
    /bin/rm -rf $tmpdir
}


cat $csource > ${comp_src}_tmp
cat ${comp_src}_tmp | sed '1 s/#!.*//' > $comp_src

$CC -o $target $comp_src $arg_1 2>$comp_log

ret_code=$?
[ "$ret_code" != "0" ] && {
    printf 'Compile Error: %s returns (%d)\n' "$CC" "$ret_code"
    echo '-----------------------------'
    cat $comp_log
    echo '-----------------------------'
    clean_up
    exit 0
}

# setup runtime environment
export CSC="1"
export CSC_VER="1.0"

[ -x $target ] || {
    echo 'Target object cannot be executed.'
    echo '----------------------------'
    cat $comp_log
    clean_up
    exit 0
}



$target $arg_3


exit $?