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Commit647ae3c

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committed
Back-patch addition of pg_wchar-to-multibyte conversion functionality.
Back-patch of commits72dd629,f6a05fd, and60e9c22.This is needed to support fixing the regex prefix extraction bug inback branches.
1 parent5edd21d commit647ae3c

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3 files changed

+259
-49
lines changed

3 files changed

+259
-49
lines changed

‎src/backend/utils/mb/mbutils.c

Lines changed: 22 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -761,6 +761,28 @@ pg_encoding_mb2wchar_with_len(int encoding,
761761
return (*pg_wchar_table[encoding].mb2wchar_with_len) ((constunsignedchar*)from,to,len);
762762
}
763763

764+
/* convert a wchar string to a multibyte */
765+
int
766+
pg_wchar2mb(constpg_wchar*from,char*to)
767+
{
768+
return (*pg_wchar_table[DatabaseEncoding->encoding].wchar2mb_with_len) (from, (unsignedchar*)to,pg_wchar_strlen(from));
769+
}
770+
771+
/* convert a wchar string to a multibyte with a limited length */
772+
int
773+
pg_wchar2mb_with_len(constpg_wchar*from,char*to,intlen)
774+
{
775+
return (*pg_wchar_table[DatabaseEncoding->encoding].wchar2mb_with_len) (from, (unsignedchar*)to,len);
776+
}
777+
778+
/* same, with any encoding */
779+
int
780+
pg_encoding_wchar2mb_with_len(intencoding,
781+
constpg_wchar*from,char*to,intlen)
782+
{
783+
return (*pg_wchar_table[encoding].wchar2mb_with_len) (from, (unsignedchar*)to,len);
784+
}
785+
764786
/* returns the byte length of a multibyte character */
765787
int
766788
pg_mblen(constchar*mbstr)

‎src/backend/utils/mb/wchar.c

Lines changed: 210 additions & 44 deletions
Original file line numberDiff line numberDiff line change
@@ -99,8 +99,7 @@ pg_euc2wchar_with_len(const unsigned char *from, pg_wchar *to, int len)
9999
*to |=*from++;
100100
len-=2;
101101
}
102-
else
103-
/* must be ASCII */
102+
else/* must be ASCII */
104103
{
105104
*to=*from++;
106105
len--;
@@ -339,6 +338,55 @@ pg_euctw_dsplen(const unsigned char *s)
339338
returnlen;
340339
}
341340

341+
/*
342+
* Convert pg_wchar to EUC_* encoding.
343+
* caller must allocate enough space for "to", including a trailing zero!
344+
* len: length of from.
345+
* "from" not necessarily null terminated.
346+
*/
347+
staticint
348+
pg_wchar2euc_with_len(constpg_wchar*from,unsignedchar*to,intlen)
349+
{
350+
intcnt=0;
351+
352+
while (len>0&&*from)
353+
{
354+
unsignedcharc;
355+
356+
if ((c= (*from >>24)))
357+
{
358+
*to++=c;
359+
*to++= (*from >>16)&0xff;
360+
*to++= (*from >>8)&0xff;
361+
*to++=*from&0xff;
362+
cnt+=4;
363+
}
364+
elseif ((c= (*from >>16)))
365+
{
366+
*to++=c;
367+
*to++= (*from >>8)&0xff;
368+
*to++=*from&0xff;
369+
cnt+=3;
370+
}
371+
elseif ((c= (*from >>8)))
372+
{
373+
*to++=c;
374+
*to++=*from&0xff;
375+
cnt+=2;
376+
}
377+
else
378+
{
379+
*to++=*from;
380+
cnt++;
381+
}
382+
from++;
383+
len--;
384+
}
385+
*to=0;
386+
returncnt;
387+
}
388+
389+
342390
/*
343391
* JOHAB
344392
*/
@@ -453,6 +501,31 @@ unicode_to_utf8(pg_wchar c, unsigned char *utf8string)
453501
returnutf8string;
454502
}
455503

504+
/*
505+
* Trivial conversion from pg_wchar to UTF-8.
506+
* caller should allocate enough space for "to"
507+
* len: length of from.
508+
* "from" not necessarily null terminated.
509+
*/
510+
staticint
511+
pg_wchar2utf_with_len(constpg_wchar*from,unsignedchar*to,intlen)
512+
{
513+
intcnt=0;
514+
515+
while (len>0&&*from)
516+
{
517+
intchar_len;
518+
519+
unicode_to_utf8(*from,to);
520+
char_len=pg_utf_mblen(to);
521+
cnt+=char_len;
522+
to+=char_len;
523+
from++;
524+
len--;
525+
}
526+
*to=0;
527+
returncnt;
528+
}
456529

457530
/*
458531
* Return the byte length of a UTF8 character pointed to by s
@@ -717,6 +790,77 @@ pg_mule2wchar_with_len(const unsigned char *from, pg_wchar *to, int len)
717790
returncnt;
718791
}
719792

793+
/*
794+
* convert pg_wchar to mule internal code
795+
* caller should allocate enough space for "to"
796+
* len: length of from.
797+
* "from" not necessarily null terminated.
798+
*/
799+
staticint
800+
pg_wchar2mule_with_len(constpg_wchar*from,unsignedchar*to,intlen)
801+
{
802+
intcnt=0;
803+
804+
while (len>0&&*from)
805+
{
806+
unsignedcharlb;
807+
808+
lb= (*from >>16)&0xff;
809+
if (IS_LC1(lb))
810+
{
811+
*to++=lb;
812+
*to++=*from&0xff;
813+
cnt+=2;
814+
}
815+
elseif (IS_LC2(lb))
816+
{
817+
*to++=lb;
818+
*to++= (*from >>8)&0xff;
819+
*to++=*from&0xff;
820+
cnt+=3;
821+
}
822+
elseif (IS_LCPRV1_A_RANGE(lb))
823+
{
824+
*to++=LCPRV1_A;
825+
*to++=lb;
826+
*to++=*from&0xff;
827+
cnt+=3;
828+
}
829+
elseif (IS_LCPRV1_B_RANGE(lb))
830+
{
831+
*to++=LCPRV1_B;
832+
*to++=lb;
833+
*to++=*from&0xff;
834+
cnt+=3;
835+
}
836+
elseif (IS_LCPRV2_A_RANGE(lb))
837+
{
838+
*to++=LCPRV2_A;
839+
*to++=lb;
840+
*to++= (*from >>8)&0xff;
841+
*to++=*from&0xff;
842+
cnt+=4;
843+
}
844+
elseif (IS_LCPRV2_B_RANGE(lb))
845+
{
846+
*to++=LCPRV2_B;
847+
*to++=lb;
848+
*to++= (*from >>8)&0xff;
849+
*to++=*from&0xff;
850+
cnt+=4;
851+
}
852+
else
853+
{
854+
*to++=*from&0xff;
855+
cnt+=1;
856+
}
857+
from++;
858+
len--;
859+
}
860+
*to=0;
861+
returncnt;
862+
}
863+
720864
int
721865
pg_mule_mblen(constunsignedchar*s)
722866
{
@@ -772,6 +916,28 @@ pg_latin12wchar_with_len(const unsigned char *from, pg_wchar *to, int len)
772916
returncnt;
773917
}
774918

919+
/*
920+
* Trivial conversion from pg_wchar to single byte encoding. Just ignores
921+
* high bits.
922+
* caller should allocate enough space for "to"
923+
* len: length of from.
924+
* "from" not necessarily null terminated.
925+
*/
926+
staticint
927+
pg_wchar2single_with_len(constpg_wchar*from,unsignedchar*to,intlen)
928+
{
929+
intcnt=0;
930+
931+
while (len>0&&*from)
932+
{
933+
*to++=*from++;
934+
len--;
935+
cnt++;
936+
}
937+
*to=0;
938+
returncnt;
939+
}
940+
775941
staticint
776942
pg_latin1_mblen(constunsignedchar*s)
777943
{
@@ -1339,48 +1505,48 @@ pg_utf8_islegal(const unsigned char *source, int length)
13391505
*-------------------------------------------------------------------
13401506
*/
13411507
pg_wchar_tblpg_wchar_table[]= {
1342-
{pg_ascii2wchar_with_len,pg_ascii_mblen,pg_ascii_dsplen,pg_ascii_verifier,1},/* PG_SQL_ASCII */
1343-
{pg_eucjp2wchar_with_len,pg_eucjp_mblen,pg_eucjp_dsplen,pg_eucjp_verifier,3},/* PG_EUC_JP */
1344-
{pg_euccn2wchar_with_len,pg_euccn_mblen,pg_euccn_dsplen,pg_euccn_verifier,2},/* PG_EUC_CN */
1345-
{pg_euckr2wchar_with_len,pg_euckr_mblen,pg_euckr_dsplen,pg_euckr_verifier,3},/* PG_EUC_KR */
1346-
{pg_euctw2wchar_with_len,pg_euctw_mblen,pg_euctw_dsplen,pg_euctw_verifier,4},/* PG_EUC_TW */
1347-
{pg_eucjp2wchar_with_len,pg_eucjp_mblen,pg_eucjp_dsplen,pg_eucjp_verifier,3},/* PG_EUC_JIS_2004 */
1348-
{pg_utf2wchar_with_len,pg_utf_mblen,pg_utf_dsplen,pg_utf8_verifier,4},/* PG_UTF8 */
1349-
{pg_mule2wchar_with_len,pg_mule_mblen,pg_mule_dsplen,pg_mule_verifier,4},/* PG_MULE_INTERNAL */
1350-
{pg_latin12wchar_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_LATIN1 */
1351-
{pg_latin12wchar_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_LATIN2 */
1352-
{pg_latin12wchar_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_LATIN3 */
1353-
{pg_latin12wchar_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_LATIN4 */
1354-
{pg_latin12wchar_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_LATIN5 */
1355-
{pg_latin12wchar_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_LATIN6 */
1356-
{pg_latin12wchar_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_LATIN7 */
1357-
{pg_latin12wchar_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_LATIN8 */
1358-
{pg_latin12wchar_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_LATIN9 */
1359-
{pg_latin12wchar_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_LATIN10 */
1360-
{pg_latin12wchar_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_WIN1256 */
1361-
{pg_latin12wchar_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_WIN1258 */
1362-
{pg_latin12wchar_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_WIN866 */
1363-
{pg_latin12wchar_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_WIN874 */
1364-
{pg_latin12wchar_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_KOI8R */
1365-
{pg_latin12wchar_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_WIN1251 */
1366-
{pg_latin12wchar_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_WIN1252 */
1367-
{pg_latin12wchar_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* ISO-8859-5 */
1368-
{pg_latin12wchar_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* ISO-8859-6 */
1369-
{pg_latin12wchar_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* ISO-8859-7 */
1370-
{pg_latin12wchar_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* ISO-8859-8 */
1371-
{pg_latin12wchar_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_WIN1250 */
1372-
{pg_latin12wchar_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_WIN1253 */
1373-
{pg_latin12wchar_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_WIN1254 */
1374-
{pg_latin12wchar_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_WIN1255 */
1375-
{pg_latin12wchar_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_WIN1257 */
1376-
{pg_latin12wchar_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_KOI8U */
1377-
{0,pg_sjis_mblen,pg_sjis_dsplen,pg_sjis_verifier,2},/* PG_SJIS */
1378-
{0,pg_big5_mblen,pg_big5_dsplen,pg_big5_verifier,2},/* PG_BIG5 */
1379-
{0,pg_gbk_mblen,pg_gbk_dsplen,pg_gbk_verifier,2},/* PG_GBK */
1380-
{0,pg_uhc_mblen,pg_uhc_dsplen,pg_uhc_verifier,2},/* PG_UHC */
1381-
{0,pg_gb18030_mblen,pg_gb18030_dsplen,pg_gb18030_verifier,4},/* PG_GB18030 */
1382-
{0,pg_johab_mblen,pg_johab_dsplen,pg_johab_verifier,3},/* PG_JOHAB */
1383-
{0,pg_sjis_mblen,pg_sjis_dsplen,pg_sjis_verifier,2}/* PG_SHIFT_JIS_2004 */
1508+
{pg_ascii2wchar_with_len,pg_wchar2single_with_len,pg_ascii_mblen,pg_ascii_dsplen,pg_ascii_verifier,1},/* PG_SQL_ASCII */
1509+
{pg_eucjp2wchar_with_len,pg_wchar2euc_with_len,pg_eucjp_mblen,pg_eucjp_dsplen,pg_eucjp_verifier,3},/* PG_EUC_JP */
1510+
{pg_euccn2wchar_with_len,pg_wchar2euc_with_len,pg_euccn_mblen,pg_euccn_dsplen,pg_euccn_verifier,2},/* PG_EUC_CN */
1511+
{pg_euckr2wchar_with_len,pg_wchar2euc_with_len,pg_euckr_mblen,pg_euckr_dsplen,pg_euckr_verifier,3},/* PG_EUC_KR */
1512+
{pg_euctw2wchar_with_len,pg_wchar2euc_with_len,pg_euctw_mblen,pg_euctw_dsplen,pg_euctw_verifier,4},/* PG_EUC_TW */
1513+
{pg_eucjp2wchar_with_len,pg_wchar2euc_with_len,pg_eucjp_mblen,pg_eucjp_dsplen,pg_eucjp_verifier,3},/* PG_EUC_JIS_2004 */
1514+
{pg_utf2wchar_with_len,pg_wchar2utf_with_len,pg_utf_mblen,pg_utf_dsplen,pg_utf8_verifier,4},/* PG_UTF8 */
1515+
{pg_mule2wchar_with_len,pg_wchar2mule_with_len,pg_mule_mblen,pg_mule_dsplen,pg_mule_verifier,4},/* PG_MULE_INTERNAL */
1516+
{pg_latin12wchar_with_len,pg_wchar2single_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_LATIN1 */
1517+
{pg_latin12wchar_with_len,pg_wchar2single_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_LATIN2 */
1518+
{pg_latin12wchar_with_len,pg_wchar2single_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_LATIN3 */
1519+
{pg_latin12wchar_with_len,pg_wchar2single_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_LATIN4 */
1520+
{pg_latin12wchar_with_len,pg_wchar2single_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_LATIN5 */
1521+
{pg_latin12wchar_with_len,pg_wchar2single_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_LATIN6 */
1522+
{pg_latin12wchar_with_len,pg_wchar2single_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_LATIN7 */
1523+
{pg_latin12wchar_with_len,pg_wchar2single_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_LATIN8 */
1524+
{pg_latin12wchar_with_len,pg_wchar2single_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_LATIN9 */
1525+
{pg_latin12wchar_with_len,pg_wchar2single_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_LATIN10 */
1526+
{pg_latin12wchar_with_len,pg_wchar2single_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_WIN1256 */
1527+
{pg_latin12wchar_with_len,pg_wchar2single_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_WIN1258 */
1528+
{pg_latin12wchar_with_len,pg_wchar2single_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_WIN866 */
1529+
{pg_latin12wchar_with_len,pg_wchar2single_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_WIN874 */
1530+
{pg_latin12wchar_with_len,pg_wchar2single_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_KOI8R */
1531+
{pg_latin12wchar_with_len,pg_wchar2single_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_WIN1251 */
1532+
{pg_latin12wchar_with_len,pg_wchar2single_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_WIN1252 */
1533+
{pg_latin12wchar_with_len,pg_wchar2single_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* ISO-8859-5 */
1534+
{pg_latin12wchar_with_len,pg_wchar2single_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* ISO-8859-6 */
1535+
{pg_latin12wchar_with_len,pg_wchar2single_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* ISO-8859-7 */
1536+
{pg_latin12wchar_with_len,pg_wchar2single_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* ISO-8859-8 */
1537+
{pg_latin12wchar_with_len,pg_wchar2single_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_WIN1250 */
1538+
{pg_latin12wchar_with_len,pg_wchar2single_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_WIN1253 */
1539+
{pg_latin12wchar_with_len,pg_wchar2single_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_WIN1254 */
1540+
{pg_latin12wchar_with_len,pg_wchar2single_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_WIN1255 */
1541+
{pg_latin12wchar_with_len,pg_wchar2single_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_WIN1257 */
1542+
{pg_latin12wchar_with_len,pg_wchar2single_with_len,pg_latin1_mblen,pg_latin1_dsplen,pg_latin1_verifier,1},/* PG_KOI8U */
1543+
{0,0,pg_sjis_mblen,pg_sjis_dsplen,pg_sjis_verifier,2},/* PG_SJIS */
1544+
{0,0,pg_big5_mblen,pg_big5_dsplen,pg_big5_verifier,2},/* PG_BIG5 */
1545+
{0,0,pg_gbk_mblen,pg_gbk_dsplen,pg_gbk_verifier,2},/* PG_GBK */
1546+
{0,0,pg_uhc_mblen,pg_uhc_dsplen,pg_uhc_verifier,2},/* PG_UHC */
1547+
{0,0,pg_gb18030_mblen,pg_gb18030_dsplen,pg_gb18030_verifier,4},/* PG_GB18030 */
1548+
{0,0,pg_johab_mblen,pg_johab_dsplen,pg_johab_verifier,3},/* PG_JOHAB */
1549+
{0,0,pg_sjis_mblen,pg_sjis_dsplen,pg_sjis_verifier,2}/* PG_SHIFT_JIS_2004 */
13841550
};
13851551

13861552
/* returns the byte length of a word for mule internal code */

‎src/include/mb/pg_wchar.h

Lines changed: 27 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -51,15 +51,27 @@ typedef unsigned int pg_wchar;
5151
/*
5252
* Is a prefix byte for "private" single byte encodings?
5353
*/
54-
#defineIS_LCPRV1(c)((unsigned char)(c) == 0x9a || (unsigned char)(c) == 0x9b)
54+
#defineLCPRV1_A0x9a
55+
#defineLCPRV1_B0x9b
56+
#defineIS_LCPRV1(c)((unsigned char)(c) == LCPRV1_A || (unsigned char)(c) == LCPRV1_B)
57+
#defineIS_LCPRV1_A_RANGE(c)\
58+
((unsigned char)(c) >= 0xa0 && (unsigned char)(c) <= 0xdf)
59+
#defineIS_LCPRV1_B_RANGE(c)\
60+
((unsigned char)(c) >= 0xe0 && (unsigned char)(c) <= 0xef)
5561
/*
5662
* Is a leading byte for "official" multibyte encodings?
5763
*/
5864
#defineIS_LC2(c)((unsigned char)(c) >= 0x90 && (unsigned char)(c) <= 0x99)
5965
/*
6066
* Is a prefix byte for "private" multibyte encodings?
6167
*/
62-
#defineIS_LCPRV2(c)((unsigned char)(c) == 0x9c || (unsigned char)(c) == 0x9d)
68+
#defineLCPRV2_A0x9c
69+
#defineLCPRV2_B0x9d
70+
#defineIS_LCPRV2(c)((unsigned char)(c) == LCPRV2_A || (unsigned char)(c) == LCPRV2_B)
71+
#defineIS_LCPRV2_A_RANGE(c)\
72+
((unsigned char)(c) >= 0xf0 && (unsigned char)(c) <= 0xf4)
73+
#defineIS_LCPRV2_B_RANGE(c)\
74+
((unsigned char)(c) >= 0xf5 && (unsigned char)(c) <= 0xfe)
6375

6476
/*----------------------------------------------------
6577
* leading characters
@@ -279,7 +291,11 @@ extern pg_enc2gettext pg_enc2gettext_tbl[];
279291
* pg_wchar stuff
280292
*/
281293
typedefint (*mb2wchar_with_len_converter) (constunsignedchar*from,
282-
pg_wchar*to,
294+
pg_wchar*to,
295+
intlen);
296+
297+
typedefint (*wchar2mb_with_len_converter) (constpg_wchar*from,
298+
unsignedchar*to,
283299
intlen);
284300

285301
typedefint (*mblen_converter) (constunsignedchar*mbstr);
@@ -290,8 +306,10 @@ typedef int (*mbverifier) (const unsigned char *mbstr, int len);
290306

291307
typedefstruct
292308
{
293-
mb2wchar_with_len_convertermb2wchar_with_len;/* convert a multibyte
294-
* string to a wchar */
309+
mb2wchar_with_len_convertermb2wchar_with_len;/* convert a multibyte
310+
* string to a wchar */
311+
wchar2mb_with_len_converterwchar2mb_with_len;/* convert a wchar
312+
* string to a multibyte */
295313
mblen_convertermblen;/* get byte length of a char */
296314
mbdisplaylen_converterdsplen;/* get display width of a char */
297315
mbverifiermbverify;/* verify multibyte sequence */
@@ -372,6 +390,10 @@ extern intpg_mb2wchar(const char *from, pg_wchar *to);
372390
externintpg_mb2wchar_with_len(constchar*from,pg_wchar*to,intlen);
373391
externintpg_encoding_mb2wchar_with_len(intencoding,
374392
constchar*from,pg_wchar*to,intlen);
393+
externintpg_wchar2mb(constpg_wchar*from,char*to);
394+
externintpg_wchar2mb_with_len(constpg_wchar*from,char*to,intlen);
395+
externintpg_encoding_wchar2mb_with_len(intencoding,
396+
constpg_wchar*from,char*to,intlen);
375397
externintpg_char_and_wchar_strcmp(constchar*s1,constpg_wchar*s2);
376398
externintpg_wchar_strncmp(constpg_wchar*s1,constpg_wchar*s2,size_tn);
377399
externintpg_char_and_wchar_strncmp(constchar*s1,constpg_wchar*s2,size_tn);

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