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libport: Handle partially overlapping buffers. 

Cause of bug discovered by Jason Edmeades.

Some applications partially overlap the two buffers, so don't assume they
don't overlap.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=38558
Signed-off-by: Gabriel Ivăncescu <gabrielopcode@gmail.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Gabriel Ivăncescu 2019-01-23 13:29:54 +02:00 committed by Alexandre Julliard
parent 2007e17d77
commit e84c26cec6
1 changed files with 42 additions and 24 deletions
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66
libs/port/mbtowc.c
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@ -65,34 +65,52 @@ static inline int mbstowcs_sbcs( const struct sbcs_table *table, int flags,
ret = -1; ret = -1;
} }
for (;;) while (srclen >= 16)
{ {
switch(srclen) dst[0] = cp2uni[src[0]];
{ dst[1] = cp2uni[src[1]];
default: dst[2] = cp2uni[src[2]];
case 16: dst[15] = cp2uni[src[15]]; dst[3] = cp2uni[src[3]];
case 15: dst[14] = cp2uni[src[14]]; dst[4] = cp2uni[src[4]];
case 14: dst[13] = cp2uni[src[13]]; dst[5] = cp2uni[src[5]];
case 13: dst[12] = cp2uni[src[12]]; dst[6] = cp2uni[src[6]];
case 12: dst[11] = cp2uni[src[11]]; dst[7] = cp2uni[src[7]];
case 11: dst[10] = cp2uni[src[10]]; dst[8] = cp2uni[src[8]];
case 10: dst[9] = cp2uni[src[9]]; dst[9] = cp2uni[src[9]];
case 9: dst[8] = cp2uni[src[8]]; dst[10] = cp2uni[src[10]];
case 8: dst[7] = cp2uni[src[7]]; dst[11] = cp2uni[src[11]];
case 7: dst[6] = cp2uni[src[6]]; dst[12] = cp2uni[src[12]];
case 6: dst[5] = cp2uni[src[5]]; dst[13] = cp2uni[src[13]];
case 5: dst[4] = cp2uni[src[4]]; dst[14] = cp2uni[src[14]];
case 4: dst[3] = cp2uni[src[3]]; dst[15] = cp2uni[src[15]];
case 3: dst[2] = cp2uni[src[2]];
case 2: dst[1] = cp2uni[src[1]];
case 1: dst[0] = cp2uni[src[0]];
case 0: break;
}
if (srclen < 16) return ret;
dst += 16;
src += 16; src += 16;
dst += 16;
srclen -= 16; srclen -= 16;
} }
/* now handle the remaining characters */
src += srclen;
dst += srclen;
switch (srclen)
{
case 15: dst[-15] = cp2uni[src[-15]];
case 14: dst[-14] = cp2uni[src[-14]];
case 13: dst[-13] = cp2uni[src[-13]];
case 12: dst[-12] = cp2uni[src[-12]];
case 11: dst[-11] = cp2uni[src[-11]];
case 10: dst[-10] = cp2uni[src[-10]];
case 9: dst[-9] = cp2uni[src[-9]];
case 8: dst[-8] = cp2uni[src[-8]];
case 7: dst[-7] = cp2uni[src[-7]];
case 6: dst[-6] = cp2uni[src[-6]];
case 5: dst[-5] = cp2uni[src[-5]];
case 4: dst[-4] = cp2uni[src[-4]];
case 3: dst[-3] = cp2uni[src[-3]];
case 2: dst[-2] = cp2uni[src[-2]];
case 1: dst[-1] = cp2uni[src[-1]];
case 0: break;
}
return ret;
} }
/* mbstowcs for single-byte code page with char decomposition */ /* mbstowcs for single-byte code page with char decomposition */