[ODBC] resolution for bug 1010313

I've resolved bug number 1010313 (it was neccessary for me because I use psqlodbc driver
on Sun Solaris Sparc with UTF-8 characters).

Top resolve this bug I've added is_big_endian() that determines whether platform supports
big endian or little endian bytes order.
This method is also used becuase it is not possible to use any standard define,
that is "standard define" and works for different compiler and operating systems.

Additionaly, becuase I don't want to calculate every time in ucs2_to_utf8 function
platform endianness I've used two static variables, first big_endian stores endianness status
and second is_endian_calc determines whether endianness was calculated.

And finally, in ucs2_to_utf8 I've added swapping bytes for big_endian platform.

Below is source code that I've implemented
(I've send all ucs2_to_utf8 function source code)

int is_big_endian()
{
union { long l; char c[sizeof (long)]; } u;
u.l = 1;
return (u.c[sizeof (long) - 1] == 1);
}

char *ucs2_to_utf8(const SQLWCHAR *ucs2str, SQLLEN ilen, SQLLEN *olen, BOOL lower_identifier)
{
char * utf8str;
/*mylog("ucs2_to_utf8 %p ilen=%d ", ucs2str, ilen);*/

/*
* is this a bigendian machine ?
*/
static int is_endian_calc = 0;
static int big_endian = 0;
if(!is_endian_calc)
{
big_endian = is_big_endian();
is_endian_calc = 1;
}

if (!ucs2str)
{
*olen = SQL_NULL_DATA;
return NULL;
}
if (SQL_NTS == ilen)
ilen = ucs2strlen(ucs2str);
/*mylog(" newlen=%d", ilen);*/
utf8str = (char *) malloc(ilen * 4 + 1);
if (utf8str)
{
int i, len = 0;
union { UInt2 i; char c[sizeof (UInt2)]; } byte2code;
union { Int4 i; char c[sizeof (Int4)]; } byte4code, surrd1, surrd2;
const SQLWCHAR *wstr;

for (i = 0, wstr = ucs2str; i < ilen; i++, wstr++)
{
if (!*wstr)
break;
else if (0 == (*wstr & 0xffffff80)) /* ASCII */
{
if (lower_identifier)
utf8str[len++] = (char) tolower(*wstr);
else
utf8str[len++] = (char) *wstr;
}
else if ((*wstr & byte3check) == 0)
{
byte2code.i = byte2_base |
((byte2_mask1 & *wstr) >> 6) |
((byte2_mask2 & *wstr) << 8);
if(big_endian)
{
memcpy(utf8str + len, (char *) &byte2code.c[1], 1);
memcpy(utf8str + len + 1, (char *) &byte2code.c[0], 1);
}
else
{
memcpy(utf8str + len, (char *) &byte2code.i, sizeof(byte2code.i));
}
len += sizeof(byte2code.i);
}
/* surrogate pair check for non ucs-2 code */
else if (surrog1_bits == (*wstr & surrog_check))
{
surrd1.i = (*wstr & ~surrog_check) + surrogate_adjust;
wstr++;
i++;
surrd2.i = (*wstr & ~surrog_check);
byte4code.i = byte4_base |
((byte4_sr1_mask1 & surrd1.i) >> 8) |
((byte4_sr1_mask2 & surrd1.i) << 6) |
((byte4_sr1_mask3 & surrd1.i) << 20) |
((byte4_sr2_mask1 & surrd2.i) << 10) |
((byte4_sr2_mask2 & surrd2.i) << 24);
if(big_endian)
{
memcpy(utf8str + len, (char *) &byte2code.c[3], 1);
memcpy(utf8str + len + 1, (char *) &byte2code.c[2], 1);
memcpy(utf8str + len + 2, (char *) &byte2code.c[1], 1);
memcpy(utf8str + len + 3, (char *) &byte2code.c[0], 1);
}
else
{
memcpy(utf8str + len, (char *) &byte4code.i, sizeof(byte4code.i));
}
len += sizeof(byte4code.i);
}
else
{
byte4code.i = byte3_base |
((byte3_mask1 & *wstr) >> 12) |
((byte3_mask2 & *wstr) << 2) |
((byte3_mask3 & *wstr) << 16);
if(big_endian)
{
memcpy(utf8str + len, (char *) &byte2code.c[3], 1);
memcpy(utf8str + len + 1, (char *) &byte2code.c[2], 1);
memcpy(utf8str + len + 2, (char *) &byte2code.c[1], 1);
}
else
{
memcpy(utf8str + len, (char *) &byte4code.i, 3);
}
len += 3;
}
}
utf8str[len] = '\0';
if (olen)
*olen = len;
}
/*mylog(" olen=%d %s\n", *olen, utf8str ? utf8str : "");*/
return utf8str;
}

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