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Current File : /proc/3/root/usr/share/doc/gawk/examples/prog/split.awk
# split.awk --- do split in awk
#
# Requires getopt() library function.
#
# Arnold Robbins, arnold@skeeve.com, Public Domain
# May 1993
# Revised slightly, May 2014
# Rewritten September 2020


function usage(     common)
{
    common = "[-a suffix-len] [file [outname]]"
    printf("usage: split [-l count]  %s\n", common) > "/dev/stderr"
    printf("       split [-b N[k|m]] %s\n", common) > "/dev/stderr"
    exit 1
}
BEGIN {
    # Set defaults:
    Suffix_length = 2
    Line_count = 1000
    Byte_count = 0
    Outfile = "x"

    parse_arguments()

    init_suffix_data()

    Output = (Outfile compute_suffix())
}
function parse_arguments(   i, c, l, modifier)
{
    while ((c = getopt(ARGC, ARGV, "a:b:l:")) != -1) {
        if (c == "a")
            Suffix_length = Optarg + 0
        else if (c == "b") {
            Byte_count = Optarg + 0
            Line_count = 0

            l = length(Optarg)
            modifier = substr(Optarg, l, 1)
            if (modifier == "k")
                Byte_count *= 1024
            else if (modifier == "m")
                Byte_count *= 1024 * 1024
        } else if (c == "l") {
            Line_count = Optarg + 0
            Byte_count = 0
        } else
            usage()
    }

    # Clear out options
    for (i = 1; i < Optind; i++)
        ARGV[i] = ""

    # Check for filename
    if (ARGV[Optind]) {
        Optind++

        # Check for different prefix
        if (ARGV[Optind]) {
            Outfile = ARGV[Optind]
            ARGV[Optind] = ""

            if (++Optind < ARGC)
                usage()
        }
    }
}
function compute_suffix(    i, result, letters)
{
    # Logical step 3
    if (Reached_last) {
        printf("split: too many files!\n") > "/dev/stderr"
        exit 1
    } else if (on_last_file())
        Reached_last = 1    # fail when wrapping after 'zzz'

    # Logical step 1
    result = ""
    letters = "abcdefghijklmnopqrstuvwxyz"
    for (i = 1; i <= Suffix_length; i++)
        result = result substr(letters, Suffix_ind[i], 1)

    # Logical step 2
    for (i = Suffix_length; i >= 1; i--) {
        if (++Suffix_ind[i] > 26) {
            Suffix_ind[i] = 1
        } else
            break
    }

    return result
}
function init_suffix_data(  i)
{
    for (i = 1; i <= Suffix_length; i++)
        Suffix_ind[i] = 1

    Reached_last = 0
}
function on_last_file(  i, on_last)
{
    on_last = 1
    for (i = 1; i <= Suffix_length; i++) {
        on_last = on_last && (Suffix_ind[i] == 26)
    }

    return on_last
}
Line_count > 0 {
    if (++tcount > Line_count) {
        close(Output)
        Output = (Outfile compute_suffix())
        tcount = 1
    }
    print > Output
}
Byte_count > 0 {
    # `+ 1' is for the final newline
    if (tcount + length($0) + 1 > Byte_count) { # would overflow
        # compute leading bytes
        leading_bytes = Byte_count - tcount

        # write leading bytes
        printf("%s", substr($0, 1, leading_bytes)) > Output

        # close old file, open new file
        close(Output)
        Output = (Outfile compute_suffix())

        # set up first bytes for new file
        $0 = substr($0, leading_bytes + 1)  # trailing bytes
        tcount = 0
    }

    # write full record or trailing bytes
    tcount += length($0) + 1
    print > Output
}
END {
    close(Output)
}

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