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#compdef dd gdd

local -a vals conv flags
local variant

_pick_variant -r variant gnu=GNU $OSTYPE --version

vals=(
  '(ibs obs)bs[block size]:block size (bytes)'
  'cbs[conversion buffer size]:buffer size (bytes)'
  'conv[specify conversions to apply]: :_values -s , conversion $conv'
  'count[number of input blocks to copy]:blocks'
  '(bs)ibs[input block size]:block size (bytes)'
  'if[specify input file]:input file:_tilde_files'
  '(bs)obs[output block size]:block size (bytes)'
  'of[specify output file]:output file:_tilde_files'
  'seek[output blocks initially skipped]:blocks'
  'skip[input blocks initially skipped]:blocks'
)
conv=(
  '(ascii asciib oldascii ebcdic ebcdicb oldebcdic ibm ibmb oldibm)'{ascii,ebcdic,ibm}
  '(unblock)block' '(block)unblock'
  '(ucase)lcase' '(lcase)ucase'
  swab sync noerror notrunc
)

case $variant in
  ^gnu)
    vals+=(
      'files[specify number of input files to copy and concatenate]:number of files'
    )
  ;|
  (gnu|darwin|dragonfly|(free|net)bsd*)
    conv+=( sparse )
  ;|
  gnu|netbsd*)
    vals+=(
      '*iflag[specify read flags]:flag:_sequence compadd - $flags'
      '*oflag[specify write flags]:flag:_sequence compadd - $flags'
    )
    flags=( append direct directory dsync sync nonblock noctty nofollow )
  ;|
  darwin*|dragonfly*|(free|net)bsd*)
    vals+=(
      'oseek[output blocks initially skipped]:blocks'
    )
    conv+=(
      '(ascii oldascii ebcdic oldebcdic oldibm)'old{ascii,ebcdic,ibm}
    )
  ;|
  (darwin|dragonfly|freebsd|netbsd|solaris)*)
    vals+=(
      'iseek[input blocks initially skipped]:blocks'
    )
  ;|
  (open|free)bsd*)
    vals+=(
      'status[specify level of information to print to stderr]:level:(none noxfer)'
    )
    conv+=( osync )
  ;|

  freebsd*)
    vals+=(
      'fillchar[specify padding character]:character'
      'speed[limit copying speed]:speed (bytes/second)'
    )
    conv+=(
      '(pareven parnone parodd parset)'{pareven,parnone,parodd,parset}
    )
  ;;
  gnu)
    vals+=(
      'status[specify level of information to print to stderr]:level:(none noxfer progress)'
    )
    flags+=( fullblock noatime nocache count_bytes skip_bytes seek_bytes )
    conv+=( excl nocreat fdatasync fsync )
  ;;
  netbsd*)
    vals+=(
      'msgfmt[specify format for information summary]:format:(quiet posix human)'
      'progress[enable progress display]:enable:(1)'
    )
    flags+=(
      wronly rdwr creat trunc excl shlock exlock cloexec nosigpipe rsync alt_io async
    )
  ;;
  solaris*)
    vals+=(
      'files[specify number of input files to copy and concatenate]:number of files'
      'oseek[output blocks initially skipped (via seek, not NUL-padding)]:blocks'
    )
    conv+=(
      '(ascii asciib ebcdic ebcdicb ibmb)'{ascii,ebcdic,ibm}b
    )
  ;;
esac

_values -w 'option' $vals