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[issue15309] buffer/memoryview slice assignment uses only memcpy

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Jul 9, 2012, 2:21 PM

Post #1 of 4 (120 views)
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[issue15309] buffer/memoryview slice assignment uses only memcpy

New submission from Ronny Pfannschmidt <ronny.pfannschmidt [at] gmail>:

thats broken for assigning overlaping regions, the memcpy docs explicitly state that memmove should be used in overlap cases

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messages: 165127
nosy: Ronny.Pfannschmidt
priority: normal
severity: normal
status: open
title: buffer/memoryview slice assignment uses only memcpy
versions: Python 2.6, Python 2.7, Python 3.1, Python 3.2, Python 3.3, Python 3.4

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Jul 9, 2012, 5:10 PM

Post #2 of 4 (119 views)
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[issue15309] buffer/memoryview slice assignment uses only memcpy [In reply to]

Changes by Antoine Pitrou <pitrou [at] free>:

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nosy: +skrah

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Jul 10, 2012, 2:17 AM

Post #3 of 4 (117 views)
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[issue15309] buffer/memoryview slice assignment uses only memcpy [In reply to]

Stefan Krah <stefan-usenet [at] bytereef> added the comment:

Could you please state the Python version and line numbers in
memoryobject.c?

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Jul 10, 2012, 3:24 PM

Post #4 of 4 (118 views)
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[issue15309] buffer/memoryview slice assignment uses only memcpy [In reply to]

Stefan Krah <stefan-usenet [at] bytereef> added the comment:

I see nothing wrong in memory_ass_sub(). In 2.7:

if (destbuf + bytelen < srcbuf || srcbuf + bytelen < destbuf)
/* No overlapping */
memcpy(destbuf, srcbuf, bytelen);
else
memmove(destbuf, srcbuf, bytelen);

Other versions use similar idioms.

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resolution: -> invalid
stage: -> committed/rejected
status: open -> closed

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