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Edit File : getopt.awk \| Size : 2.15 KB
# getopt.awk --- Do C library getopt(3) function in awk # # Arnold Robbins, arnold@skeeve.com, Public Domain # # Initial version: March, 1991 # Revised: May, 1993 # External variables: # Optind -- index in ARGV of first nonoption argument # Optarg -- string value of argument to current option # Opterr -- if nonzero, print our own diagnostic # Optopt -- current option letter # Returns: # -1 at end of options # "?" for unrecognized option # <c> a character representing the current option # Private Data: # _opti -- index in multiflag option, e.g., -abc function getopt(argc, argv, options, thisopt, i) { if (length(options) == 0) # no options given return -1 if (argv[Optind] == "--") { # all done Optind++ _opti = 0 return -1 } else if (argv[Optind] !~ /^-[^:[:space:]]/) { _opti = 0 return -1 } if (_opti == 0) _opti = 2 thisopt = substr(argv[Optind], _opti, 1) Optopt = thisopt i = index(options, thisopt) if (i == 0) { if (Opterr) printf("%c -- invalid option\n", thisopt) > "/dev/stderr" if (_opti >= length(argv[Optind])) { Optind++ _opti = 0 } else _opti++ return "?" } if (substr(options, i + 1, 1) == ":") { # get option argument if (length(substr(argv[Optind], _opti + 1)) > 0) Optarg = substr(argv[Optind], _opti + 1) else Optarg = argv[++Optind] _opti = 0 } else Optarg = "" if (_opti == 0 \|\| _opti >= length(argv[Optind])) { Optind++ _opti = 0 } else _opti++ return thisopt } BEGIN { Opterr = 1 # default is to diagnose Optind = 1 # skip ARGV[0] # test program if (_getopt_test) { while ((_go_c = getopt(ARGC, ARGV, "ab:cd")) != -1) printf("c = <%c>, Optarg = <%s>\n", _go_c, Optarg) printf("non-option arguments:\n") for (; Optind < ARGC; Optind++) printf("\tARGV[%d] = <%s>\n", Optind, ARGV[Optind]) } } Back

Edit File : getopt.awk | Size : 2.15 KB

# getopt.awk --- Do C library getopt(3) function in awk
#
# Arnold Robbins, arnold@skeeve.com, Public Domain
#
# Initial version: March, 1991
# Revised: May, 1993

# External variables:
#    Optind -- index in ARGV of first nonoption argument
#    Optarg -- string value of argument to current option
#    Opterr -- if nonzero, print our own diagnostic
#    Optopt -- current option letter

# Returns:
#    -1     at end of options
#    "?"    for unrecognized option
#    <c>    a character representing the current option

# Private Data:
#    _opti  -- index in multiflag option, e.g., -abc
function getopt(argc, argv, options,    thisopt, i)
{
    if (length(options) == 0)    # no options given
        return -1

if (argv[Optind] == "--") {  # all done
        Optind++
        _opti = 0
        return -1
    } else if (argv[Optind] !~ /^-[^:[:space:]]/) {
        _opti = 0
        return -1
    }
    if (_opti == 0)
        _opti = 2
    thisopt = substr(argv[Optind], _opti, 1)
    Optopt = thisopt
    i = index(options, thisopt)
    if (i == 0) {
        if (Opterr)
            printf("%c -- invalid option\n", thisopt) > "/dev/stderr"
        if (_opti >= length(argv[Optind])) {
            Optind++
            _opti = 0
        } else
            _opti++
        return "?"
    }
    if (substr(options, i + 1, 1) == ":") {
        # get option argument
        if (length(substr(argv[Optind], _opti + 1)) > 0)
            Optarg = substr(argv[Optind], _opti + 1)
        else
            Optarg = argv[++Optind]
        _opti = 0
    } else
        Optarg = ""
    if (_opti == 0 || _opti >= length(argv[Optind])) {
        Optind++
        _opti = 0
    } else
        _opti++
    return thisopt
}
BEGIN {
    Opterr = 1    # default is to diagnose
    Optind = 1    # skip ARGV[0]

# test program
    if (_getopt_test) {
        while ((_go_c = getopt(ARGC, ARGV, "ab:cd")) != -1)
            printf("c = <%c>, Optarg = <%s>\n",
                                       _go_c, Optarg)
        printf("non-option arguments:\n")
        for (; Optind < ARGC; Optind++)
            printf("\tARGV[%d] = <%s>\n",
                                    Optind, ARGV[Optind])
    }
}

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