read-into ( buf -- buf-slice more? )
Factor handbook > Input and output > Streams > Default input and output streams

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Inputs and outputs
bufa byte-array, a specialized-array, or a string
buf-slicea slice
more?a boolean

Generic word contract
Reads from the current input-stream into the sequence buf, until either the length of buf is reached or the stream is exhausted. Returns a slice over the part of buf that was written to, and a boolean value that will be f if the stream was exhausted.

Throws an error if the I/O operation fails.