read - Read from a channel
read ?-nonewline? channelId
read channelId numChars
In the first form, the read command reads all of the data from
channelId up to the end of the file.
If the -nonewline switch is specified then the last character
of the file is discarded if it is a newline.
In the second form, the extra argument specifies how many characters to
read. Exactly that many characters will be read and returned, unless
there are fewer than numChars left in the file; in this case
all the remaining characters are returned. If the channel is
configured to use a multi-byte encoding, then the number of characters
read may not be the same as the number of bytes read.
If channelId is in nonblocking mode, the command may not read as
many characters as requested: once all available input has been read,
the command will return the data that is available rather than
blocking for more input. If the channel is configured to use a
multi-byte encoding, then there may actually be some bytes remaining
in the internal buffers that do not form a complete character. These
bytes will not be returned until a complete character is available or
end-of-file is reached.
The -nonewline switch is ignored if the command returns
before reaching the end of the file.
Read translates end-of-line sequences in the input into
newline characters according to the -translation option
for the channel.
See the fconfigure manual entry for a discussion on ways in
which fconfigure will alter input.
eof, fblocked, fconfigure
blocking, channel, end of line, end of file, nonblocking, read, translation, encoding
Copyright © 1993 The Regents of the University of California.
Copyright © 1994-1996 Sun Microsystems, Inc.
Copyright © 1995-1997 Roger E. Critchlow Jr.
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