From: Rich Felker <dalias@aerifal.cx>
Date: Thu, 4 Apr 2013 18:42:35 +0000 (-0400)
Subject: overhaul mbsrtowcs
X-Git-Url: http://nsz.repo.hu/git/?p=musl;a=commitdiff_plain;h=50d9661d9b231f503b21e9d8787d1411b864d58a;hp=50d9661d9b231f503b21e9d8787d1411b864d58a

overhaul mbsrtowcs

these changes fix at least two bugs:
- misaligned access to the input as uint32_t for vectorized ASCII test
- incorrect src pointer after stopping on EILSEQ

in addition, the text of the standard makes it unclear whether the
mbstate_t object is to be modified when the destination pointer is
null; previously it was cleared either way; now, it's only cleared
when the destination is non-null. this change may need revisiting, but
it should not affect most applications, since calling mbsrtowcs with
non-zero state can only happen when the head of the string was already
processed with mbrtowc.

finally, these changes shave about 20% size off the function and seem
to improve performance by 1-5%.
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