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zlib: Clarify when 'gzread!' can return zero.

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* guix/zlib.scm (gzread!): Augment docstring to clarify when zero is
returned (based on reading zlib code).
(make-gzip-input-port)[read!]: Remove scary comment.
This commit is contained in:
Ludovic Courtès 2016-07-27 11:44:34 +02:00
parent 46bd451520
commit d00240c36e
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1 changed files with 2 additions and 2 deletions
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guix/zlib.scm
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@ -92,7 +92,8 @@ closes FD."
(let ((proc (zlib-procedure int "gzread" (list '* '* unsigned-int))))
(lambda* (gzfile bv #:optional (start 0) (count (bytevector-length bv)))
"Read up to COUNT bytes from GZFILE into BV at offset START. Return the
number of uncompressed bytes actually read."
number of uncompressed bytes actually read; it is zero if COUNT is zero or if
the end-of-stream has been reached."
(let ((ret (proc (gzip-file->pointer gzfile)
(bytevector->pointer bv start)
count)))
@ -172,7 +173,6 @@ buffer increases decompression speed."
(gzdopen (fileno port) "r"))
(define (read! bv start count)
;; XXX: Can 'gzread!' return zero even though we haven't reached the EOF?
(gzread! gzfile bv start count))
(unless (= buffer-size %default-buffer-size)