[haiku-bugs] Re: [Haiku] #8481: strncpy doesn't pad the destination string with NULs
- From: "pdziepak" <trac@xxxxxxxxxxxx>
- Date: Wed, 25 Apr 2012 17:12:21 -0000
#8481: strncpy doesn't pad the destination string with NULs
---------------------------------+----------------------------
Reporter: hamish | Owner: tqh
Type: bug | Status: in-progress
Priority: normal | Milestone: R1
Component: System/libroot.so | Version: R1/Development
Resolution: | Keywords: strncpy
Blocked By: | Blocking:
Has a Patch: 1 | Platform: All
---------------------------------+----------------------------
Comment (by pdziepak):
Replying to [comment:12 tqh]:
> Yes, mine too. I was fishing for comments on if we should have special
case for x86. Probably not worth it.
Functions like `strncpy`, `strncmp`, `strcpy`, `memcpy`, `memcmp`, etc are
usually implemented in assembly (thus there are different versions of them
for each architecture). Apparently it is still worth to do that. I wrote a
[http://pastebin.com/5iQ8LxUD simple test] and compiled it on gcc 4.6.3.
`memcpy1` takes about 300ms to complete, while `memcpy2` needs only 100ms.
Obviously, `memcpy` is the easiest of these functions to make run much
faster when implemented in assembly, but then again it may be worth to
consider such option.
--
Ticket URL: <http://dev.haiku-os.org/ticket/8481#comment:15>
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