> I had to back out the patch. It only compiles with multi-byte enabled.

 Ooops, I forget... here it is again.

> > >  If encoding is not supported returns ERROR.

 and if multibyte not enabled too....


 Thanks.

                                Karel
~

src/backend/utils/adt/Makefile

 #
 # Makefile for utils/adt
 #
-# $Header: /cvsroot/pgsql/src/backend/utils/adt/Makefile,v 1.43 2000/08/04 20:46:43 momjian Exp $
+# $Header: /cvsroot/pgsql/src/backend/utils/adt/Makefile,v 1.44 2000/08/05 14:59:17 momjian Exp $
 #
 
 subdir = src/backend/utils/adt
@@ -23,7 +23,8 @@ OBJS = acl.o arrayfuncs.o arrayutils.o bool.o cash.o char.o \
 	regexp.o regproc.o ruleutils.o selfuncs.o sets.o \
 	tid.o timestamp.o varbit.o varchar.o varlena.o version.o \
 	network.o mac.o inet_net_ntop.o inet_net_pton.o \
-	ri_triggers.o pg_lzcompress.o pg_locale.o formatting.o
+	ri_triggers.o pg_lzcompress.o pg_locale.o formatting.o \
+	ascii.o
 
 all: SUBSYS.o
 

src/backend/utils/adt/ascii.c

+
+/* -----------------------------------------------------------------------
+ * ascii.c
+ *
+ * $Header: /cvsroot/pgsql/src/backend/utils/adt/ascii.c,v 1.3 2000/08/05 14:59:17 momjian Exp $
+ *
+ *	 Portions Copyright (c) 1999-2000, PostgreSQL, Inc
+ *
+ *
+ *	 TO_ASCII()
+ *
+ *	 The PostgreSQL routine for string to ascii conversion.
+ *
+ * -----------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+#include "utils/builtins.h"
+#include "mb/pg_wchar.h"
+#include "utils/ascii.h"
+
+/* ----------
+ * even if MULTIBYTE is not enabled, these functions are necessary
+ * since pg_proc.h has references to them.
+ * ----------
+ */
+#ifndef MULTIBYTE
+
+static void multibyte_error(void);
+
+static void
+multibyte_error()
+{
+	elog(ERROR, "multibyte not supported.");
+}
+
+Datum 
+to_ascii_encname(PG_FUNCTION_ARGS)
+{
+	multibyte_error();
+}
+
+Datum 
+to_ascii_enc(PG_FUNCTION_ARGS)
+{
+	multibyte_error();
+}
+
+Datum 
+to_ascii_default(PG_FUNCTION_ARGS)
+{
+	multibyte_error();
+}
+
+
+#else /* with MULTIBYTE */
+
+
+/* ----------
+ * even if MULTIBYTE is enabled
+ * ----------
+ */
+ 
+static text *encode_to_ascii(text *data, int enc);
+
+/* ----------
+ * to_ascii 
+ * ----------
+ */
+char *
+pg_to_ascii(unsigned char *src, unsigned char *src_end, unsigned char *desc, int enc)
+{
+	unsigned char	*x 	= NULL;
+	unsigned char	*ascii	= NULL ;
+	int		range	= 0;
+	
+	/* 
+	 * relevant start for an encoding 
+	 */ 
+	#define RANGE_128	128	
+	#define RANGE_160	160
+	
+	
+	if (enc == LATIN1)
+	{
+		/* ----------
+		 * ISO-8859-1 <range: 160 -- 255>
+		 * ----------
+		 */
+		ascii = "  cL Y  \"Ca  -R     'u .,      ?AAAAAAACEEEEIIII NOOOOOxOUUUUYTBaaaaaaaceeeeiiii nooooo/ouuuuyty";
+		range = RANGE_160;
+	}
+	else if (enc == LATIN2)
+	{
+		/* ----------
+		 * ISO-8859-2 <range: 160 -- 255>
+		 * ----------
+		 */
+		ascii = " A L LS \"SSTZ-ZZ a,l'ls ,sstz\"zzRAAAALCCCEEEEIIDDNNOOOOxRUUUUYTBraaaalccceeeeiiddnnoooo/ruuuuyt.";
+		range = RANGE_160;
+	}
+	else if (enc == WIN1250)
+	{
+		/* ----------
+		 * Window CP1250 <range: 128 -- 255>
+		 * ----------
+		 */
+		ascii = "  ' \"    %S<STZZ `'\"\".--  s>stzz   L A  \"CS  -RZ  ,l'u .,as L\"lzRAAAALCCCEEEEIIDDNNOOOOxRUUUUYTBraaaalccceeeeiiddnnoooo/ruuuuyt ";
+		range = RANGE_128;
+	}
+	else
+	{
+		elog(ERROR, "pg_to_ascii(): unsupported encoding from %s", 
+						pg_encoding_to_char(enc));
+	}
+	
+	/* ----------
+	 * Encode
+	 * ----------
+	 */
+	for (x = src; x <= src_end; x++)
+	{
+		if (*x < 128)			
+			*desc++ = *x;
+		else if (*x < range)
+			*desc++ = ' ';  	/* bogus 128 to 'range' */
+		else
+			*desc++ = ascii[*x - range];	
+	}		
+	
+	return desc;
+}
+
+/* ----------
+ * encode text
+ * ----------
+ */
+static text *
+encode_to_ascii(text *data, int enc)
+{
+	pg_to_ascii(
+		(unsigned char *) VARDATA(data), 		/* src */
+		VARDATA(data) + VARSIZE(data),			/* src end */
+		(unsigned char *) VARDATA(data),		/* desc */	
+		enc);						/* encoding */
+	
+	return data;
+}
+
+/* ----------
+ * convert to ASCII - enc is set as 'name' arg.
+ * ----------
+ */
+Datum
+to_ascii_encname(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_TEXT_P
+	( 
+		encode_to_ascii
+		( 
+			PG_GETARG_TEXT_P_COPY(0), 
+			pg_char_to_encoding( NameStr(*PG_GETARG_NAME(1)) ) 
+		)
+	);	
+}
+
+/* ----------
+ * convert to ASCII - enc is set as int4
+ * ----------
+ */
+Datum 
+to_ascii_enc(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_TEXT_P
+	( 
+		encode_to_ascii
+		( 
+			PG_GETARG_TEXT_P_COPY(0), 
+			PG_GETARG_INT32(1) 
+		)
+	);	
+}
+
+/* ----------
+ * convert to ASCII - current enc is DatabaseEncoding
+ * ----------
+ */
+Datum
+to_ascii_default(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_TEXT_P 
+	( 
+		encode_to_ascii
+		( 
+			PG_GETARG_TEXT_P_COPY(0), 
+			GetDatabaseEncoding()
+		)
+	);
+}
+
+#endif /* MULTIBYTE */		
\ No newline at end of file

src/include/catalog/pg_proc.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2000, PostgreSQL, Inc
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: pg_proc.h,v 1.159 2000/08/04 20:46:43 momjian Exp $
+ * $Id: pg_proc.h,v 1.160 2000/08/05 14:59:19 momjian Exp $
  *
  * NOTES
  *	  The script catalog/genbki.sh reads this file and generates .bki
@@ -2442,6 +2442,14 @@ DESCR("aggregate transition function");
 DATA(insert OID = 1844 (  interval_avg	   PGUID 12 f t t t 1 f 1186 "1187" 100 0 0 100  interval_avg - ));
 DESCR("AVG aggregate final function");
 
+/* To ASCII conversion */ 
+DATA(insert OID = 1845 ( to_ascii	PGUID 12 f t t t 1 f	25 "25" 100 0 0 100  to_ascii_default - ));
+DESCR("encode text from DB encoding to ASCII text");
+DATA(insert OID = 1846 ( to_ascii	PGUID 12 f t t t 2 f	25 "25 23" 100 0 0 100  to_ascii_enc - ));
+DESCR("encode text from encoding to ASCII text");
+DATA(insert OID = 1847 ( to_ascii	PGUID 12 f t t t 2 f	25 "25 19" 100 0 0 100  to_ascii_encname - ));
+DESCR("encode text from encoding to ASCII text");
+
 DATA(insert OID = 1850 (  int28eq		   PGUID 12 f t t t 2 f 16 "21 20" 100 0 0 100  int28eq - ));
 DESCR("equal");
 DATA(insert OID = 1851 (  int28ne		   PGUID 12 f t t t 2 f 16 "21 20" 100 0 0 100  int28ne - ));

src/include/utils/ascii.h

+
+/* -----------------------------------------------------------------------
+ * ascii.h
+ *
+ * $Id: ascii.h,v 1.3 2000/08/05 14:59:29 momjian Exp $
+ *
+ *	 Portions Copyright (c) 1999-2000, PostgreSQL, Inc
+ *
+ * -----------------------------------------------------------------------
+ */
+
+#ifndef _ASCII_H_
+#define _ASCII_H_
+
+#include "fmgr.h"
+
+extern Datum to_ascii_encname(PG_FUNCTION_ARGS);
+extern Datum to_ascii_enc(PG_FUNCTION_ARGS);
+extern Datum to_ascii_default(PG_FUNCTION_ARGS);
+
+#ifdef MULTIBYTE
+
+extern char *pg_to_ascii(unsigned char *src, unsigned char *src_end, 
+					unsigned char *desc, int enc);
+#endif /* MULTIBYTE */
+
+#endif /* _ASCII_H_ */