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Faster implementation of wcstombs that handles overlapping buffers 

properly (based on a patch by Dmitry Timoshkov).
This commit is contained in:
Alexandre Julliard 2005-07-22 09:23:16 +00:00
parent 34a5b5636a
commit 385a199fef
1 changed files with 42 additions and 35 deletions
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77
libs/unicode/wctomb.c
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@ -142,45 +142,52 @@ static inline int wcstombs_sbcs( const struct sbcs_table *table,
ret = -1;
}
if (dst <= (const char *)src && dst + 16 > (const char *)src)
while (srclen >= 16)
{
/* overlapping buffers, do it char by char */
while (srclen--)
{
*dst++ = uni2cp_low[uni2cp_high[*src >> 8] + (*src & 0xff)];
src++;
}
return ret;
}
for (;;)
{
switch(srclen)
{
default:
case 16: dst[15] = uni2cp_low[uni2cp_high[src[15] >> 8] + (src[15] & 0xff)];
case 15: dst[14] = uni2cp_low[uni2cp_high[src[14] >> 8] + (src[14] & 0xff)];
case 14: dst[13] = uni2cp_low[uni2cp_high[src[13] >> 8] + (src[13] & 0xff)];
case 13: dst[12] = uni2cp_low[uni2cp_high[src[12] >> 8] + (src[12] & 0xff)];
case 12: dst[11] = uni2cp_low[uni2cp_high[src[11] >> 8] + (src[11] & 0xff)];
case 11: dst[10] = uni2cp_low[uni2cp_high[src[10] >> 8] + (src[10] & 0xff)];
case 10: dst[9] = uni2cp_low[uni2cp_high[src[9] >> 8] + (src[9] & 0xff)];
case 9: dst[8] = uni2cp_low[uni2cp_high[src[8] >> 8] + (src[8] & 0xff)];
case 8: dst[7] = uni2cp_low[uni2cp_high[src[7] >> 8] + (src[7] & 0xff)];
case 7: dst[6] = uni2cp_low[uni2cp_high[src[6] >> 8] + (src[6] & 0xff)];
case 6: dst[5] = uni2cp_low[uni2cp_high[src[5] >> 8] + (src[5] & 0xff)];
case 5: dst[4] = uni2cp_low[uni2cp_high[src[4] >> 8] + (src[4] & 0xff)];
case 4: dst[3] = uni2cp_low[uni2cp_high[src[3] >> 8] + (src[3] & 0xff)];
case 3: dst[2] = uni2cp_low[uni2cp_high[src[2] >> 8] + (src[2] & 0xff)];
case 2: dst[1] = uni2cp_low[uni2cp_high[src[1] >> 8] + (src[1] & 0xff)];
case 1: dst[0] = uni2cp_low[uni2cp_high[src[0] >> 8] + (src[0] & 0xff)];
case 0: break;
}
if (srclen < 16) return ret;
dst += 16;
dst[0] = uni2cp_low[uni2cp_high[src[0] >> 8] + (src[0] & 0xff)];
dst[1] = uni2cp_low[uni2cp_high[src[1] >> 8] + (src[1] & 0xff)];
dst[2] = uni2cp_low[uni2cp_high[src[2] >> 8] + (src[2] & 0xff)];
dst[3] = uni2cp_low[uni2cp_high[src[3] >> 8] + (src[3] & 0xff)];
dst[4] = uni2cp_low[uni2cp_high[src[4] >> 8] + (src[4] & 0xff)];
dst[5] = uni2cp_low[uni2cp_high[src[5] >> 8] + (src[5] & 0xff)];
dst[6] = uni2cp_low[uni2cp_high[src[6] >> 8] + (src[6] & 0xff)];
dst[7] = uni2cp_low[uni2cp_high[src[7] >> 8] + (src[7] & 0xff)];
dst[8] = uni2cp_low[uni2cp_high[src[8] >> 8] + (src[8] & 0xff)];
dst[9] = uni2cp_low[uni2cp_high[src[9] >> 8] + (src[9] & 0xff)];
dst[10] = uni2cp_low[uni2cp_high[src[10] >> 8] + (src[10] & 0xff)];
dst[11] = uni2cp_low[uni2cp_high[src[11] >> 8] + (src[11] & 0xff)];
dst[12] = uni2cp_low[uni2cp_high[src[12] >> 8] + (src[12] & 0xff)];
dst[13] = uni2cp_low[uni2cp_high[src[13] >> 8] + (src[13] & 0xff)];
dst[14] = uni2cp_low[uni2cp_high[src[14] >> 8] + (src[14] & 0xff)];
dst[15] = uni2cp_low[uni2cp_high[src[15] >> 8] + (src[15] & 0xff)];
src += 16;
dst += 16;
srclen -= 16;
}
/* now handle remaining characters */
src += srclen;
dst += srclen;
switch(srclen)
{
case 15: dst[-15] = uni2cp_low[uni2cp_high[src[-15] >> 8] + (src[-15] & 0xff)];
case 14: dst[-14] = uni2cp_low[uni2cp_high[src[-14] >> 8] + (src[-14] & 0xff)];
case 13: dst[-13] = uni2cp_low[uni2cp_high[src[-13] >> 8] + (src[-13] & 0xff)];
case 12: dst[-12] = uni2cp_low[uni2cp_high[src[-12] >> 8] + (src[-12] & 0xff)];
case 11: dst[-11] = uni2cp_low[uni2cp_high[src[-11] >> 8] + (src[-11] & 0xff)];
case 10: dst[-10] = uni2cp_low[uni2cp_high[src[-10] >> 8] + (src[-10] & 0xff)];
case 9: dst[-9] = uni2cp_low[uni2cp_high[src[-9] >> 8] + (src[-9] & 0xff)];
case 8: dst[-8] = uni2cp_low[uni2cp_high[src[-8] >> 8] + (src[-8] & 0xff)];
case 7: dst[-7] = uni2cp_low[uni2cp_high[src[-7] >> 8] + (src[-7] & 0xff)];
case 6: dst[-6] = uni2cp_low[uni2cp_high[src[-6] >> 8] + (src[-6] & 0xff)];
case 5: dst[-5] = uni2cp_low[uni2cp_high[src[-5] >> 8] + (src[-5] & 0xff)];
case 4: dst[-4] = uni2cp_low[uni2cp_high[src[-4] >> 8] + (src[-4] & 0xff)];
case 3: dst[-3] = uni2cp_low[uni2cp_high[src[-3] >> 8] + (src[-3] & 0xff)];
case 2: dst[-2] = uni2cp_low[uni2cp_high[src[-2] >> 8] + (src[-2] & 0xff)];
case 1: dst[-1] = uni2cp_low[uni2cp_high[src[-1] >> 8] + (src[-1] & 0xff)];
case 0: break;
}
return ret;
}
/* slow version of wcstombs_sbcs that handles the various flags */