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FILE-POSITION reports wrong values #181

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jlahd opened this issue Jan 3, 2019 · 0 comments
Open

FILE-POSITION reports wrong values #181

jlahd opened this issue Jan 3, 2019 · 0 comments

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@jlahd
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jlahd commented Jan 3, 2019 •
edited by xrme
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For streams with non-byte ELEMENT-TYPE, FILE-POSITION reports wrong values after the I/O buffer is advanced:

? (with-open-file (f "/dev/zero" :direction :input :element-type '(unsigned-byte 32))
(loop for i below 2000
do (read-byte f)
collect (file-position f)))
(1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54\ 55 56 57 58 59 60 61 62 63 16 17 18 19 20 21 22 23 ...

This happens because element size is not properly accounted for in input-file-ioblock-advance. Patch proposal attached.

file-position-patch.zip

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jlahd added a commit to jlahd/ccl that referenced this issue Jan 3, 2019
@jlahd
Fix to issue Clozure#181, file-position returning wrong values
ad6b4b5
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