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Replaced memset by hand made equivalent to work around some buggy

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memset implementations.
This commit is contained in:
Eric Pouech 2001-08-18 16:09:41 +00:00 committed by Alexandre Julliard
parent 6360917580
commit 96c514bdf8
1 changed files with 26 additions and 2 deletions
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28
dlls/winmm/wineoss/audio.c
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@ -1322,8 +1322,32 @@ static HRESULT DSDB_MapPrimary(IDsDriverBufferImpl *dsdb)
} }
TRACE("(%p): sound device has been mapped for direct access at %p, size=%ld\n", dsdb, wwo->mapping, wwo->maplen); TRACE("(%p): sound device has been mapped for direct access at %p, size=%ld\n", dsdb, wwo->mapping, wwo->maplen);
/* for some reason, es1371 and sblive! sometimes have junk in here. */ /* for some reason, es1371 and sblive! sometimes have junk in here.
memset(wwo->mapping,0,wwo->maplen); /* clear it, or we get junk noise */ * clear it, or we get junk noise */
/* some libc implementations are buggy: their memset reads from the buffer...
* to work around it, we have the 0 the block by hand and do not call:
* memset(wwo->mapping,0,wwo->maplen);
*/
{
char* p1 = wwo->mapping;
unsigned len = wwo->maplen;
if (len >= 16) /* so we can have at least a 4 longs to store... */
{
/* the mmap:ed value is (at least) dword aligned
* so, start filling the complete unsigned long:s
*/
int b = len >> 2;
unsigned long* p4 = (unsigned long*)p1;
while (b--) *p4++ = 0;
/* prepare for filling the rest */
len &= 3;
p1 = (unsigned char*)p4;
}
/* in all cases, fill the remaining bytes */
while (len-- != 0) *p1++ = 0;
}
} }
return DS_OK; return DS_OK;
} }