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Re: Read (sysread) binary data into utf8 string

by ikegami (Pope)
on Apr 04, 2017 at 04:45 UTC ( #1186936=note: print w/replies, xml ) Need Help??


in reply to Read (sysread) binary data into utf8 string

[ In the following, a character refers to a string element. For example, string $str has length($str) characters, which can be obtained using substr($str, $index, 1). Whether that character represents a byte, a Unicode Code Point, or something else is of no consequence. ]

  • OFFSET is (unconditionally) a number of characters. Usually, one passes the length of SCALAR.

    sysread($fh, $buf, BLOCK_SIZE, length($buf))
  • LENGTH is (unconditionally) the maximum number of characters to add to SCALAR. For a non-binary handle, this may result in more bytes read than LENGTH.

  • The return value is (unconditionally) the number of characters added to SCALAR. For a non-binary handle, this may be less than the number of bytes read.

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