Refactor to add pg_strcoll(), pg_strxfrm(), and variants.

Offers a generally better separation of responsibilities for collation
code. Also, a step towards multi-lib ICU, which should be based on a
clean separation of the routines required for collation providers.

Callers with NUL-terminated strings should call pg_strcoll() or
pg_strxfrm(); callers with strings and their length should call the
variants pg_strncoll() or pg_strnxfrm().

Reviewed-by: Peter Eisentraut, Peter Geoghegan
Discussion: https://postgr.es/m/a581136455c940d7bd0ff482d3a2bd51af25a94f.camel%40j-davis.com

5 files changed, 871 insertions, 391 deletions

diff --git a/src/backend/access/hash/hashfunc.c b/src/backend/access/hash/hashfunc.c
index e3e40d6c21a..2deba44abd3 100644
--- a/src/backend/access/hash/hashfunc.c
+++ b/src/backend/access/hash/hashfunc.c
@@ -292,21 +292,24 @@ hashtext(PG_FUNCTION_ARGS)
 #ifdef USE_ICU
 		if (mylocale->provider == COLLPROVIDER_ICU)
 		{
-			int32_t		ulen = -1;
-			UChar	   *uchar = NULL;
-			Size		bsize;
-			uint8_t    *buf;
+			Size		bsize, rsize;
+			char	   *buf;
+			const char *keydata = VARDATA_ANY(key);
+			size_t		keylen = VARSIZE_ANY_EXHDR(key);
 
-			ulen = icu_to_uchar(&uchar, VARDATA_ANY(key), VARSIZE_ANY_EXHDR(key));
+			bsize = pg_strnxfrm(NULL, 0, keydata, keylen, mylocale);
+			buf = palloc(bsize + 1);
 
-			bsize = ucol_getSortKey(mylocale->info.icu.ucol,
-									uchar, ulen, NULL, 0);
-			buf = palloc(bsize);
-			ucol_getSortKey(mylocale->info.icu.ucol,
-							uchar, ulen, buf, bsize);
-			pfree(uchar);
+			rsize = pg_strnxfrm(buf, bsize + 1, keydata, keylen, mylocale);
+			if (rsize != bsize)
+				elog(ERROR, "pg_strnxfrm() returned unexpected result");
 
-			result = hash_any(buf, bsize);
+			/*
+			 * In principle, there's no reason to include the terminating NUL
+			 * character in the hash, but it was done before and the behavior
+			 * must be preserved.
+			 */
+			result = hash_any((uint8_t *) buf, bsize + 1);
 
 			pfree(buf);
 		}
@@ -350,21 +353,25 @@ hashtextextended(PG_FUNCTION_ARGS)
 #ifdef USE_ICU
 		if (mylocale->provider == COLLPROVIDER_ICU)
 		{
-			int32_t		ulen = -1;
-			UChar	   *uchar = NULL;
-			Size		bsize;
-			uint8_t    *buf;
-
-			ulen = icu_to_uchar(&uchar, VARDATA_ANY(key), VARSIZE_ANY_EXHDR(key));
-
-			bsize = ucol_getSortKey(mylocale->info.icu.ucol,
-									uchar, ulen, NULL, 0);
-			buf = palloc(bsize);
-			ucol_getSortKey(mylocale->info.icu.ucol,
-							uchar, ulen, buf, bsize);
-			pfree(uchar);
-
-			result = hash_any_extended(buf, bsize, PG_GETARG_INT64(1));
+			Size		bsize, rsize;
+			char	   *buf;
+			const char *keydata = VARDATA_ANY(key);
+			size_t		keylen = VARSIZE_ANY_EXHDR(key);
+
+			bsize = pg_strnxfrm(NULL, 0, keydata, keylen, mylocale);
+			buf = palloc(bsize + 1);
+
+			rsize = pg_strnxfrm(buf, bsize + 1, keydata, keylen, mylocale);
+			if (rsize != bsize)
+				elog(ERROR, "pg_strnxfrm() returned unexpected result");
+
+			/*
+			 * In principle, there's no reason to include the terminating NUL
+			 * character in the hash, but it was done before and the behavior
+			 * must be preserved.
+			 */
+			result = hash_any_extended((uint8_t *) buf, bsize + 1,
+									   PG_GETARG_INT64(1));
 
 			pfree(buf);
 		}
diff --git a/src/backend/utils/adt/pg_locale.c b/src/backend/utils/adt/pg_locale.c
index 059e4fd79f0..ef9efb4a7c9 100644
--- a/src/backend/utils/adt/pg_locale.c
+++ b/src/backend/utils/adt/pg_locale.c
@@ -79,6 +79,12 @@
 #include <shlwapi.h>
 #endif
 
+/*
+ * This should be large enough that most strings will fit, but small enough
+ * that we feel comfortable putting it on the stack
+ */
+#define		TEXTBUFLEN			1024
+
 #define		MAX_L10N_DATA		80
 
 
@@ -123,6 +129,19 @@ static char *IsoLocaleName(const char *);
 #endif
 
 #ifdef USE_ICU
+/*
+ * Converter object for converting between ICU's UChar strings and C strings
+ * in database encoding.  Since the database encoding doesn't change, we only
+ * need one of these per session.
+ */
+static UConverter *icu_converter = NULL;
+
+static void init_icu_converter(void);
+static size_t uchar_length(UConverter *converter,
+						   const char *str, int32_t len);
+static int32_t uchar_convert(UConverter *converter,
+							 UChar *dest, int32_t destlen,
+							 const char *str, int32_t srclen);
 static void icu_set_collation_attributes(UCollator *collator, const char *loc);
 #endif
 
@@ -1731,15 +1750,705 @@ get_collation_actual_version(char collprovider, const char *collcollate)
 	return collversion;
 }
 
+/*
+ * pg_strncoll_libc_win32_utf8
+ *
+ * Win32 does not have UTF-8. Convert UTF8 arguments to wide characters and
+ * invoke wcscoll() or wcscoll_l().
+ */
+#ifdef WIN32
+static int
+pg_strncoll_libc_win32_utf8(const char *arg1, size_t len1, const char *arg2,
+							size_t len2, pg_locale_t locale)
+{
+	char		sbuf[TEXTBUFLEN];
+	char	   *buf = sbuf;
+	char	   *a1p,
+			   *a2p;
+	int			a1len = len1 * 2 + 2;
+	int			a2len = len2 * 2 + 2;
+	int			r;
+	int			result;
+
+	Assert(!locale || locale->provider == COLLPROVIDER_LIBC);
+	Assert(GetDatabaseEncoding() == PG_UTF8);
+#ifndef WIN32
+	Assert(false);
+#endif
+
+	if (a1len + a2len > TEXTBUFLEN)
+		buf = palloc(a1len + a2len);
+
+	a1p = buf;
+	a2p = buf + a1len;
+
+	/* API does not work for zero-length input */
+	if (len1 == 0)
+		r = 0;
+	else
+	{
+		r = MultiByteToWideChar(CP_UTF8, 0, arg1, len1,
+								(LPWSTR) a1p, a1len / 2);
+		if (!r)
+			ereport(ERROR,
+					(errmsg("could not convert string to UTF-16: error code %lu",
+							GetLastError())));
+	}
+	((LPWSTR) a1p)[r] = 0;
+
+	if (len2 == 0)
+		r = 0;
+	else
+	{
+		r = MultiByteToWideChar(CP_UTF8, 0, arg2, len2,
+								(LPWSTR) a2p, a2len / 2);
+		if (!r)
+			ereport(ERROR,
+					(errmsg("could not convert string to UTF-16: error code %lu",
+							GetLastError())));
+	}
+	((LPWSTR) a2p)[r] = 0;
+
+	errno = 0;
+#ifdef HAVE_LOCALE_T
+	if (locale)
+		result = wcscoll_l((LPWSTR) a1p, (LPWSTR) a2p, locale->info.lt);
+	else
+#endif
+		result = wcscoll((LPWSTR) a1p, (LPWSTR) a2p);
+	if (result == 2147483647)	/* _NLSCMPERROR; missing from mingw
+								 * headers */
+		ereport(ERROR,
+				(errmsg("could not compare Unicode strings: %m")));
+
+	if (buf != sbuf)
+		pfree(buf);
+
+	return result;
+}
+#endif							/* WIN32 */
+
+/*
+ * pg_strcoll_libc
+ *
+ * Call strcoll(), strcoll_l(), wcscoll(), or wcscoll_l() as appropriate for
+ * the given locale, platform, and database encoding. If the locale is NULL,
+ * use the database collation.
+ *
+ * Arguments must be encoded in the database encoding and nul-terminated.
+ */
+static int
+pg_strcoll_libc(const char *arg1, const char *arg2, pg_locale_t locale)
+{
+	int result;
+
+	Assert(!locale || locale->provider == COLLPROVIDER_LIBC);
+#ifdef WIN32
+	if (GetDatabaseEncoding() == PG_UTF8)
+	{
+		size_t len1 = strlen(arg1);
+		size_t len2 = strlen(arg2);
+		result = pg_strncoll_libc_win32_utf8(arg1, len1, arg2, len2, locale);
+	}
+	else
+#endif							/* WIN32 */
+	if (locale)
+	{
+#ifdef HAVE_LOCALE_T
+		result = strcoll_l(arg1, arg2, locale->info.lt);
+#else
+		/* shouldn't happen */
+		elog(ERROR, "unsupported collprovider: %c", locale->provider);
+#endif
+	}
+	else
+		result = strcoll(arg1, arg2);
+
+	return result;
+}
+
+/*
+ * pg_strncoll_libc
+ *
+ * Nul-terminate the arguments and call pg_strcoll_libc().
+ */
+static int
+pg_strncoll_libc(const char *arg1, size_t len1, const char *arg2, size_t len2,
+				 pg_locale_t locale)
+{
+	char	 sbuf[TEXTBUFLEN];
+	char	*buf	  = sbuf;
+	size_t	 bufsize1 = len1 + 1;
+	size_t	 bufsize2 = len2 + 1;
+	char	*arg1n;
+	char	*arg2n;
+	int		 result;
+
+	Assert(!locale || locale->provider == COLLPROVIDER_LIBC);
+
+#ifdef WIN32
+	/* check for this case before doing the work for nul-termination */
+	if (GetDatabaseEncoding() == PG_UTF8)
+		return pg_strncoll_libc_win32_utf8(arg1, len1, arg2, len2, locale);
+#endif							/* WIN32 */
+
+	if (bufsize1 + bufsize2 > TEXTBUFLEN)
+		buf = palloc(bufsize1 + bufsize2);
+
+	arg1n = buf;
+	arg2n = buf + bufsize1;
+
+	/* nul-terminate arguments */
+	memcpy(arg1n, arg1, len1);
+	arg1n[len1] = '\0';
+	memcpy(arg2n, arg2, len2);
+	arg2n[len2] = '\0';
+
+	result = pg_strcoll_libc(arg1n, arg2n, locale);
+
+	if (buf != sbuf)
+		pfree(buf);
+
+	return result;
+}
 
 #ifdef USE_ICU
+
 /*
- * Converter object for converting between ICU's UChar strings and C strings
- * in database encoding.  Since the database encoding doesn't change, we only
- * need one of these per session.
+ * pg_strncoll_icu_no_utf8
+ *
+ * Convert the arguments from the database encoding to UChar strings, then
+ * call ucol_strcoll(). An argument length of -1 means that the string is
+ * NUL-terminated.
+ *
+ * When the database encoding is UTF-8, and ICU supports ucol_strcollUTF8(),
+ * caller should call that instead.
  */
-static UConverter *icu_converter = NULL;
+static int
+pg_strncoll_icu_no_utf8(const char *arg1, int32_t len1,
+						const char *arg2, int32_t len2, pg_locale_t locale)
+{
+	char	 sbuf[TEXTBUFLEN];
+	char	*buf = sbuf;
+	int32_t	 ulen1;
+	int32_t	 ulen2;
+	size_t   bufsize1;
+	size_t   bufsize2;
+	UChar	*uchar1,
+			*uchar2;
+	int		 result;
+
+	Assert(locale->provider == COLLPROVIDER_ICU);
+#ifdef HAVE_UCOL_STRCOLLUTF8
+	Assert(GetDatabaseEncoding() != PG_UTF8);
+#endif
+
+	init_icu_converter();
+
+	ulen1 = uchar_length(icu_converter, arg1, len1);
+	ulen2 = uchar_length(icu_converter, arg2, len2);
+
+	bufsize1 = (ulen1 + 1) * sizeof(UChar);
+	bufsize2 = (ulen2 + 1) * sizeof(UChar);
+
+	if (bufsize1 + bufsize2 > TEXTBUFLEN)
+		buf = palloc(bufsize1 + bufsize2);
+
+	uchar1 = (UChar *) buf;
+	uchar2 = (UChar *) (buf + bufsize1);
+
+	ulen1 = uchar_convert(icu_converter, uchar1, ulen1 + 1, arg1, len1);
+	ulen2 = uchar_convert(icu_converter, uchar2, ulen2 + 1, arg2, len2);
+
+	result = ucol_strcoll(locale->info.icu.ucol,
+						  uchar1, ulen1,
+						  uchar2, ulen2);
+
+	if (buf != sbuf)
+		pfree(buf);
+
+	return result;
+}
+
+/*
+ * pg_strncoll_icu
+ *
+ * Call ucol_strcollUTF8() or ucol_strcoll() as appropriate for the given
+ * database encoding. An argument length of -1 means the string is
+ * NUL-terminated.
+ *
+ * Arguments must be encoded in the database encoding.
+ */
+static int
+pg_strncoll_icu(const char *arg1, int32_t len1, const char *arg2, int32_t len2,
+				pg_locale_t locale)
+{
+	int result;
+
+	Assert(locale->provider == COLLPROVIDER_ICU);
+
+#ifdef HAVE_UCOL_STRCOLLUTF8
+	if (GetDatabaseEncoding() == PG_UTF8)
+	{
+		UErrorCode	status;
+
+		status = U_ZERO_ERROR;
+		result = ucol_strcollUTF8(locale->info.icu.ucol,
+								  arg1, len1,
+								  arg2, len2,
+								  &status);
+		if (U_FAILURE(status))
+			ereport(ERROR,
+					(errmsg("collation failed: %s", u_errorName(status))));
+	}
+	else
+#endif
+	{
+		result = pg_strncoll_icu_no_utf8(arg1, len1, arg2, len2, locale);
+	}
+
+	return result;
+}
+
+#endif							/* USE_ICU */
+
+/*
+ * pg_strcoll
+ *
+ * Call ucol_strcollUTF8(), ucol_strcoll(), strcoll(), strcoll_l(), wcscoll(),
+ * or wcscoll_l() as appropriate for the given locale, platform, and database
+ * encoding. If the locale is not specified, use the database collation.
+ *
+ * Arguments must be encoded in the database encoding and nul-terminated.
+ *
+ * The caller is responsible for breaking ties if the collation is
+ * deterministic; this maintains consistency with pg_strxfrm(), which cannot
+ * easily account for deterministic collations.
+ */
+int
+pg_strcoll(const char *arg1, const char *arg2, pg_locale_t locale)
+{
+	int			result;
+
+	if (!locale || locale->provider == COLLPROVIDER_LIBC)
+		result = pg_strcoll_libc(arg1, arg2, locale);
+#ifdef USE_ICU
+	else if (locale->provider == COLLPROVIDER_ICU)
+		result = pg_strncoll_icu(arg1, -1, arg2, -1, locale);
+#endif
+	else
+		/* shouldn't happen */
+		elog(ERROR, "unsupported collprovider: %c", locale->provider);
+
+	return result;
+}
+
+/*
+ * pg_strncoll
+ *
+ * Call ucol_strcollUTF8(), ucol_strcoll(), strcoll(), strcoll_l(), wcscoll(),
+ * or wcscoll_l() as appropriate for the given locale, platform, and database
+ * encoding. If the locale is not specified, use the database collation.
+ *
+ * Arguments must be encoded in the database encoding.
+ *
+ * This function may need to nul-terminate the arguments for libc functions;
+ * so if the caller already has nul-terminated strings, it should call
+ * pg_strcoll() instead.
+ *
+ * The caller is responsible for breaking ties if the collation is
+ * deterministic; this maintains consistency with pg_strnxfrm(), which cannot
+ * easily account for deterministic collations.
+ */
+int
+pg_strncoll(const char *arg1, size_t len1, const char *arg2, size_t len2,
+			pg_locale_t locale)
+{
+	int		 result;
+
+	if (!locale || locale->provider == COLLPROVIDER_LIBC)
+		result = pg_strncoll_libc(arg1, len1, arg2, len2, locale);
+#ifdef USE_ICU
+	else if (locale->provider == COLLPROVIDER_ICU)
+		result = pg_strncoll_icu(arg1, len1, arg2, len2, locale);
+#endif
+	else
+		/* shouldn't happen */
+		elog(ERROR, "unsupported collprovider: %c", locale->provider);
+
+	return result;
+}
+
+
+static size_t
+pg_strxfrm_libc(char *dest, const char *src, size_t destsize,
+				pg_locale_t locale)
+{
+	Assert(!locale || locale->provider == COLLPROVIDER_LIBC);
+
+#ifdef TRUST_STRXFRM
+#ifdef HAVE_LOCALE_T
+	if (locale)
+		return strxfrm_l(dest, src, destsize, locale->info.lt);
+	else
+#endif
+		return strxfrm(dest, src, destsize);
+#else
+	/* shouldn't happen */
+	elog(ERROR, "unsupported collprovider: %c", locale->provider);
+#endif
+}
+
+static size_t
+pg_strnxfrm_libc(char *dest, const char *src, size_t srclen, size_t destsize,
+				 pg_locale_t locale)
+{
+	char	 sbuf[TEXTBUFLEN];
+	char	*buf	 = sbuf;
+	size_t	 bufsize = srclen + 1;
+	size_t	 result;
+
+	Assert(!locale || locale->provider == COLLPROVIDER_LIBC);
+
+	if (bufsize > TEXTBUFLEN)
+		buf = palloc(bufsize);
 
+	/* nul-terminate arguments */
+	memcpy(buf, src, srclen);
+	buf[srclen] = '\0';
+
+	result = pg_strxfrm_libc(dest, buf, destsize, locale);
+
+	if (buf != sbuf)
+		pfree(buf);
+
+	/* if dest is defined, it should be nul-terminated */
+	Assert(result >= destsize || dest[result] == '\0');
+
+	return result;
+}
+
+#ifdef USE_ICU
+
+/* 'srclen' of -1 means the strings are NUL-terminated */
+static size_t
+pg_strnxfrm_icu(char *dest, const char *src, int32_t srclen, int32_t destsize,
+				pg_locale_t locale)
+{
+	char	 sbuf[TEXTBUFLEN];
+	char	*buf	= sbuf;
+	UChar	*uchar;
+	int32_t	 ulen;
+	size_t   uchar_bsize;
+	Size	 result_bsize;
+
+	Assert(locale->provider == COLLPROVIDER_ICU);
+
+	init_icu_converter();
+
+	ulen = uchar_length(icu_converter, src, srclen);
+
+	uchar_bsize = (ulen + 1) * sizeof(UChar);
+
+	if (uchar_bsize > TEXTBUFLEN)
+		buf = palloc(uchar_bsize);
+
+	uchar = (UChar *) buf;
+
+	ulen = uchar_convert(icu_converter, uchar, ulen + 1, src, srclen);
+
+	result_bsize = ucol_getSortKey(locale->info.icu.ucol,
+								   uchar, ulen,
+								   (uint8_t *) dest, destsize);
+
+	/*
+	 * ucol_getSortKey() counts the nul-terminator in the result length, but
+	 * this function should not.
+	 */
+	Assert(result_bsize > 0);
+	result_bsize--;
+
+	if (buf != sbuf)
+		pfree(buf);
+
+	/* if dest is defined, it should be nul-terminated */
+	Assert(result_bsize >= destsize || dest[result_bsize] == '\0');
+
+	return result_bsize;
+}
+
+/* 'srclen' of -1 means the strings are NUL-terminated */
+static size_t
+pg_strnxfrm_prefix_icu_no_utf8(char *dest, const char *src, int32_t srclen,
+							   int32_t destsize, pg_locale_t locale)
+{
+	char			 sbuf[TEXTBUFLEN];
+	char			*buf   = sbuf;
+	UCharIterator	 iter;
+	uint32_t		 state[2];
+	UErrorCode		 status;
+	int32_t			 ulen  = -1;
+	UChar			*uchar = NULL;
+	size_t			 uchar_bsize;
+	Size			 result_bsize;
+
+	Assert(locale->provider == COLLPROVIDER_ICU);
+	Assert(GetDatabaseEncoding() != PG_UTF8);
+
+	init_icu_converter();
+
+	ulen = uchar_length(icu_converter, src, srclen);
+
+	uchar_bsize = (ulen + 1) * sizeof(UChar);
+
+	if (uchar_bsize > TEXTBUFLEN)
+		buf = palloc(uchar_bsize);
+
+	uchar = (UChar *) buf;
+
+	ulen = uchar_convert(icu_converter, uchar, ulen + 1, src, srclen);
+
+	uiter_setString(&iter, uchar, ulen);
+	state[0] = state[1] = 0;	/* won't need that again */
+	status = U_ZERO_ERROR;
+	result_bsize = ucol_nextSortKeyPart(locale->info.icu.ucol,
+										&iter,
+										state,
+										(uint8_t *) dest,
+										destsize,
+										&status);
+	if (U_FAILURE(status))
+		ereport(ERROR,
+				(errmsg("sort key generation failed: %s",
+						u_errorName(status))));
+
+	return result_bsize;
+}
+
+/* 'srclen' of -1 means the strings are NUL-terminated */
+static size_t
+pg_strnxfrm_prefix_icu(char *dest, const char *src, int32_t srclen,
+					   int32_t destsize, pg_locale_t locale)
+{
+	size_t result;
+
+	Assert(locale->provider == COLLPROVIDER_ICU);
+
+	if (GetDatabaseEncoding() == PG_UTF8)
+	{
+		UCharIterator iter;
+		uint32_t	state[2];
+		UErrorCode	status;
+
+		uiter_setUTF8(&iter, src, srclen);
+		state[0] = state[1] = 0;	/* won't need that again */
+		status = U_ZERO_ERROR;
+		result = ucol_nextSortKeyPart(locale->info.icu.ucol,
+									  &iter,
+									  state,
+									  (uint8_t *) dest,
+									  destsize,
+									  &status);
+		if (U_FAILURE(status))
+			ereport(ERROR,
+					(errmsg("sort key generation failed: %s",
+							u_errorName(status))));
+	}
+	else
+		result = pg_strnxfrm_prefix_icu_no_utf8(dest, src, srclen, destsize,
+												locale);
+
+	return result;
+}
+
+#endif
+
+/*
+ * Return true if the collation provider supports pg_strxfrm() and
+ * pg_strnxfrm(); otherwise false.
+ *
+ * Unfortunately, it seems that strxfrm() for non-C collations is broken on
+ * many common platforms; testing of multiple versions of glibc reveals that,
+ * for many locales, strcoll() and strxfrm() do not return consistent
+ * results. While no other libc other than Cygwin has so far been shown to
+ * have a problem, we take the conservative course of action for right now and
+ * disable this categorically.  (Users who are certain this isn't a problem on
+ * their system can define TRUST_STRXFRM.)
+ *
+ * No similar problem is known for the ICU provider.
+ */
+bool
+pg_strxfrm_enabled(pg_locale_t locale)
+{
+	if (!locale || locale->provider == COLLPROVIDER_LIBC)
+#ifdef TRUST_STRXFRM
+		return true;
+#else
+		return false;
+#endif
+	else if (locale->provider == COLLPROVIDER_ICU)
+		return true;
+	else
+		/* shouldn't happen */
+		elog(ERROR, "unsupported collprovider: %c", locale->provider);
+}
+
+/*
+ * pg_strxfrm
+ *
+ * Transforms 'src' to a nul-terminated string stored in 'dest' such that
+ * ordinary strcmp() on transformed strings is equivalent to pg_strcoll() on
+ * untransformed strings.
+ *
+ * The provided 'src' must be nul-terminated. If 'destsize' is zero, 'dest'
+ * may be NULL.
+ *
+ * Returns the number of bytes needed to store the transformed string,
+ * excluding the terminating nul byte. If the value returned is 'destsize' or
+ * greater, the resulting contents of 'dest' are undefined.
+ */
+size_t
+pg_strxfrm(char *dest, const char *src, size_t destsize, pg_locale_t locale)
+{
+	size_t result;
+
+	if (!locale || locale->provider == COLLPROVIDER_LIBC)
+		result = pg_strxfrm_libc(dest, src, destsize, locale);
+#ifdef USE_ICU
+	else if (locale->provider == COLLPROVIDER_ICU)
+		result = pg_strnxfrm_icu(dest, src, -1, destsize, locale);
+#endif
+	else
+		/* shouldn't happen */
+		elog(ERROR, "unsupported collprovider: %c", locale->provider);
+
+	return result;
+}
+
+/*
+ * pg_strnxfrm
+ *
+ * Transforms 'src' to a nul-terminated string stored in 'dest' such that
+ * ordinary strcmp() on transformed strings is equivalent to pg_strcoll() on
+ * untransformed strings.
+ *
+ * 'src' does not need to be nul-terminated. If 'destsize' is zero, 'dest' may
+ * be NULL.
+ *
+ * Returns the number of bytes needed to store the transformed string,
+ * excluding the terminating nul byte. If the value returned is 'destsize' or
+ * greater, the resulting contents of 'dest' are undefined.
+ *
+ * This function may need to nul-terminate the argument for libc functions;
+ * so if the caller already has a nul-terminated string, it should call
+ * pg_strxfrm() instead.
+ */
+size_t
+pg_strnxfrm(char *dest, size_t destsize, const char *src, size_t srclen,
+			pg_locale_t locale)
+{
+	size_t result;
+
+	if (!locale || locale->provider == COLLPROVIDER_LIBC)
+		result = pg_strnxfrm_libc(dest, src, srclen, destsize, locale);
+#ifdef USE_ICU
+	else if (locale->provider == COLLPROVIDER_ICU)
+		result = pg_strnxfrm_icu(dest, src, srclen, destsize, locale);
+#endif
+	else
+		/* shouldn't happen */
+		elog(ERROR, "unsupported collprovider: %c", locale->provider);
+
+	return result;
+}
+
+/*
+ * Return true if the collation provider supports pg_strxfrm_prefix() and
+ * pg_strnxfrm_prefix(); otherwise false.
+ */
+bool
+pg_strxfrm_prefix_enabled(pg_locale_t locale)
+{
+	if (!locale || locale->provider == COLLPROVIDER_LIBC)
+		return false;
+	else if (locale->provider == COLLPROVIDER_ICU)
+		return true;
+	else
+		/* shouldn't happen */
+		elog(ERROR, "unsupported collprovider: %c", locale->provider);
+}
+
+/*
+ * pg_strxfrm_prefix
+ *
+ * Transforms 'src' to a byte sequence stored in 'dest' such that ordinary
+ * memcmp() on the byte sequence is equivalent to pg_strcoll() on
+ * untransformed strings. The result is not nul-terminated.
+ *
+ * The provided 'src' must be nul-terminated.
+ *
+ * If destsize is not large enough to hold the resulting byte sequence, stores
+ * only the first destsize bytes in 'dest'. Returns the number of bytes
+ * actually copied to 'dest'.
+ */
+size_t
+pg_strxfrm_prefix(char *dest, const char *src, size_t destsize,
+				  pg_locale_t locale)
+{
+	size_t result;
+
+	if (!locale || locale->provider == COLLPROVIDER_LIBC)
+		elog(ERROR, "collprovider '%c' does not support pg_strxfrm_prefix()",
+			 locale->provider);
+#ifdef USE_ICU
+	else if (locale->provider == COLLPROVIDER_ICU)
+		result = pg_strnxfrm_prefix_icu(dest, src, -1, destsize, locale);
+#endif
+	else
+		/* shouldn't happen */
+		elog(ERROR, "unsupported collprovider: %c", locale->provider);
+
+	return result;
+}
+
+/*
+ * pg_strnxfrm_prefix
+ *
+ * Transforms 'src' to a byte sequence stored in 'dest' such that ordinary
+ * memcmp() on the byte sequence is equivalent to pg_strcoll() on
+ * untransformed strings. The result is not nul-terminated.
+ *
+ * The provided 'src' must be nul-terminated.
+ *
+ * If destsize is not large enough to hold the resulting byte sequence, stores
+ * only the first destsize bytes in 'dest'. Returns the number of bytes
+ * actually copied to 'dest'.
+ *
+ * This function may need to nul-terminate the argument for libc functions;
+ * so if the caller already has a nul-terminated string, it should call
+ * pg_strxfrm_prefix() instead.
+ */
+size_t
+pg_strnxfrm_prefix(char *dest, size_t destsize, const char *src,
+				   size_t srclen, pg_locale_t locale)
+{
+	size_t result;
+
+	if (!locale || locale->provider == COLLPROVIDER_LIBC)
+		elog(ERROR, "collprovider '%c' does not support pg_strnxfrm_prefix()",
+			 locale->provider);
+#ifdef USE_ICU
+	else if (locale->provider == COLLPROVIDER_ICU)
+		result = pg_strnxfrm_prefix_icu(dest, src, -1, destsize, locale);
+#endif
+	else
+		/* shouldn't happen */
+		elog(ERROR, "unsupported collprovider: %c", locale->provider);
+
+	return result;
+}
+
+#ifdef USE_ICU
 static void
 init_icu_converter(void)
 {
@@ -1768,6 +2477,39 @@ init_icu_converter(void)
 }
 
 /*
+ * Find length, in UChars, of given string if converted to UChar string.
+ */
+static size_t
+uchar_length(UConverter *converter, const char *str, int32_t len)
+{
+	UErrorCode	status = U_ZERO_ERROR;
+	int32_t		ulen;
+	ulen = ucnv_toUChars(converter, NULL, 0, str, len, &status);
+	if (U_FAILURE(status) && status != U_BUFFER_OVERFLOW_ERROR)
+		ereport(ERROR,
+				(errmsg("%s failed: %s", "ucnv_toUChars", u_errorName(status))));
+	return ulen;
+}
+
+/*
+ * Convert the given source string into a UChar string, stored in dest, and
+ * return the length (in UChars).
+ */
+static int32_t
+uchar_convert(UConverter *converter, UChar *dest, int32_t destlen,
+			  const char *src, int32_t srclen)
+{
+	UErrorCode	status = U_ZERO_ERROR;
+	int32_t		ulen;
+	status = U_ZERO_ERROR;
+	ulen = ucnv_toUChars(converter, dest, destlen, src, srclen, &status);
+	if (U_FAILURE(status))
+		ereport(ERROR,
+				(errmsg("%s failed: %s", "ucnv_toUChars", u_errorName(status))));
+	return ulen;
+}
+
+/*
  * Convert a string in the database encoding into a string of UChars.
  *
  * The source string at buff is of length nbytes
@@ -1782,26 +2524,15 @@ init_icu_converter(void)
 int32_t
 icu_to_uchar(UChar **buff_uchar, const char *buff, size_t nbytes)
 {
-	UErrorCode	status;
-	int32_t		len_uchar;
+	int32_t len_uchar;
 
 	init_icu_converter();
 
-	status = U_ZERO_ERROR;
-	len_uchar = ucnv_toUChars(icu_converter, NULL, 0,
-							  buff, nbytes, &status);
-	if (U_FAILURE(status) && status != U_BUFFER_OVERFLOW_ERROR)
-		ereport(ERROR,
-				(errmsg("%s failed: %s", "ucnv_toUChars", u_errorName(status))));
+	len_uchar = uchar_length(icu_converter, buff, nbytes);
 
 	*buff_uchar = palloc((len_uchar + 1) * sizeof(**buff_uchar));
-
-	status = U_ZERO_ERROR;
-	len_uchar = ucnv_toUChars(icu_converter, *buff_uchar, len_uchar + 1,
-							  buff, nbytes, &status);
-	if (U_FAILURE(status))
-		ereport(ERROR,
-				(errmsg("%s failed: %s", "ucnv_toUChars", u_errorName(status))));
+	len_uchar = uchar_convert(icu_converter,
+							  *buff_uchar, len_uchar + 1, buff, nbytes);
 
 	return len_uchar;
 }
diff --git a/src/backend/utils/adt/varchar.c b/src/backend/utils/adt/varchar.c
index 8ddbae8f51d..9ff3bcbdb75 100644
--- a/src/backend/utils/adt/varchar.c
+++ b/src/backend/utils/adt/varchar.c
@@ -1024,21 +1024,22 @@ hashbpchar(PG_FUNCTION_ARGS)
 #ifdef USE_ICU
 		if (mylocale->provider == COLLPROVIDER_ICU)
 		{
-			int32_t		ulen = -1;
-			UChar	   *uchar = NULL;
-			Size		bsize;
-			uint8_t    *buf;
+			Size		bsize, rsize;
+			char	   *buf;
 
-			ulen = icu_to_uchar(&uchar, keydata, keylen);
+			bsize = pg_strnxfrm(NULL, 0, keydata, keylen, mylocale);
+			buf = palloc(bsize + 1);
 
-			bsize = ucol_getSortKey(mylocale->info.icu.ucol,
-									uchar, ulen, NULL, 0);
-			buf = palloc(bsize);
-			ucol_getSortKey(mylocale->info.icu.ucol,
-							uchar, ulen, buf, bsize);
-			pfree(uchar);
+			rsize = pg_strnxfrm(buf, bsize + 1, keydata, keylen, mylocale);
+			if (rsize != bsize)
+				elog(ERROR, "pg_strnxfrm() returned unexpected result");
 
-			result = hash_any(buf, bsize);
+			/*
+			 * In principle, there's no reason to include the terminating NUL
+			 * character in the hash, but it was done before and the behavior
+			 * must be preserved.
+			 */
+			result = hash_any((uint8_t *) buf, bsize + 1);
 
 			pfree(buf);
 		}
@@ -1086,21 +1087,23 @@ hashbpcharextended(PG_FUNCTION_ARGS)
 #ifdef USE_ICU
 		if (mylocale->provider == COLLPROVIDER_ICU)
 		{
-			int32_t		ulen = -1;
-			UChar	   *uchar = NULL;
-			Size		bsize;
-			uint8_t    *buf;
+			Size		bsize, rsize;
+			char	   *buf;
 
-			ulen = icu_to_uchar(&uchar, keydata, keylen);
+			bsize = pg_strnxfrm(NULL, 0, keydata, keylen, mylocale);
+			buf = palloc(bsize + 1);
 
-			bsize = ucol_getSortKey(mylocale->info.icu.ucol,
-									uchar, ulen, NULL, 0);
-			buf = palloc(bsize);
-			ucol_getSortKey(mylocale->info.icu.ucol,
-							uchar, ulen, buf, bsize);
-			pfree(uchar);
+			rsize = pg_strnxfrm(buf, bsize + 1, keydata, keylen, mylocale);
+			if (rsize != bsize)
+				elog(ERROR, "pg_strnxfrm() returned unexpected result");
 
-			result = hash_any_extended(buf, bsize, PG_GETARG_INT64(1));
+			/*
+			 * In principle, there's no reason to include the terminating NUL
+			 * character in the hash, but it was done before and the behavior
+			 * must be preserved.
+			 */
+			result = hash_any_extended((uint8_t *) buf, bsize + 1,
+									   PG_GETARG_INT64(1));
 
 			pfree(buf);
 		}
diff --git a/src/backend/utils/adt/varlena.c b/src/backend/utils/adt/varlena.c
index 170b3a3820b..4ca823ca7b1 100644
--- a/src/backend/utils/adt/varlena.c
+++ b/src/backend/utils/adt/varlena.c
@@ -1553,10 +1553,6 @@ varstr_cmp(const char *arg1, int len1, const char *arg2, int len2, Oid collid)
 	}
 	else
 	{
-		char		a1buf[TEXTBUFLEN];
-		char		a2buf[TEXTBUFLEN];
-		char	   *a1p,
-				   *a2p;
 		pg_locale_t mylocale;
 
 		mylocale = pg_newlocale_from_collation(collid);
@@ -1573,171 +1569,16 @@ varstr_cmp(const char *arg1, int len1, const char *arg2, int len2, Oid collid)
 		if (len1 == len2 && memcmp(arg1, arg2, len1) == 0)
 			return 0;
 
-#ifdef WIN32
-		/* Win32 does not have UTF-8, so we need to map to UTF-16 */
-		if (GetDatabaseEncoding() == PG_UTF8
-			&& (!mylocale || mylocale->provider == COLLPROVIDER_LIBC))
-		{
-			int			a1len;
-			int			a2len;
-			int			r;
-
-			if (len1 >= TEXTBUFLEN / 2)
-			{
-				a1len = len1 * 2 + 2;
-				a1p = palloc(a1len);
-			}
-			else
-			{
-				a1len = TEXTBUFLEN;
-				a1p = a1buf;
-			}
-			if (len2 >= TEXTBUFLEN / 2)
-			{
-				a2len = len2 * 2 + 2;
-				a2p = palloc(a2len);
-			}
-			else
-			{
-				a2len = TEXTBUFLEN;
-				a2p = a2buf;
-			}
-
-			/* stupid Microsloth API does not work for zero-length input */
-			if (len1 == 0)
-				r = 0;
-			else
-			{
-				r = MultiByteToWideChar(CP_UTF8, 0, arg1, len1,
-										(LPWSTR) a1p, a1len / 2);
-				if (!r)
-					ereport(ERROR,
-							(errmsg("could not convert string to UTF-16: error code %lu",
-									GetLastError())));
-			}
-			((LPWSTR) a1p)[r] = 0;
-
-			if (len2 == 0)
-				r = 0;
-			else
-			{
-				r = MultiByteToWideChar(CP_UTF8, 0, arg2, len2,
-										(LPWSTR) a2p, a2len / 2);
-				if (!r)
-					ereport(ERROR,
-							(errmsg("could not convert string to UTF-16: error code %lu",
-									GetLastError())));
-			}
-			((LPWSTR) a2p)[r] = 0;
-
-			errno = 0;
-#ifdef HAVE_LOCALE_T
-			if (mylocale)
-				result = wcscoll_l((LPWSTR) a1p, (LPWSTR) a2p, mylocale->info.lt);
-			else
-#endif
-				result = wcscoll((LPWSTR) a1p, (LPWSTR) a2p);
-			if (result == 2147483647)	/* _NLSCMPERROR; missing from mingw
-										 * headers */
-				ereport(ERROR,
-						(errmsg("could not compare Unicode strings: %m")));
-
-			/* Break tie if necessary. */
-			if (result == 0 &&
-				(!mylocale || mylocale->deterministic))
-			{
-				result = memcmp(arg1, arg2, Min(len1, len2));
-				if ((result == 0) && (len1 != len2))
-					result = (len1 < len2) ? -1 : 1;
-			}
-
-			if (a1p != a1buf)
-				pfree(a1p);
-			if (a2p != a2buf)
-				pfree(a2p);
-
-			return result;
-		}
-#endif							/* WIN32 */
-
-		if (len1 >= TEXTBUFLEN)
-			a1p = (char *) palloc(len1 + 1);
-		else
-			a1p = a1buf;
-		if (len2 >= TEXTBUFLEN)
-			a2p = (char *) palloc(len2 + 1);
-		else
-			a2p = a2buf;
-
-		memcpy(a1p, arg1, len1);
-		a1p[len1] = '\0';
-		memcpy(a2p, arg2, len2);
-		a2p[len2] = '\0';
-
-		if (mylocale)
-		{
-			if (mylocale->provider == COLLPROVIDER_ICU)
-			{
-#ifdef USE_ICU
-#ifdef HAVE_UCOL_STRCOLLUTF8
-				if (GetDatabaseEncoding() == PG_UTF8)
-				{
-					UErrorCode	status;
-
-					status = U_ZERO_ERROR;
-					result = ucol_strcollUTF8(mylocale->info.icu.ucol,
-											  arg1, len1,
-											  arg2, len2,
-											  &status);
-					if (U_FAILURE(status))
-						ereport(ERROR,
-								(errmsg("collation failed: %s", u_errorName(status))));
-				}
-				else
-#endif
-				{
-					int32_t		ulen1,
-								ulen2;
-					UChar	   *uchar1,
-							   *uchar2;
-
-					ulen1 = icu_to_uchar(&uchar1, arg1, len1);
-					ulen2 = icu_to_uchar(&uchar2, arg2, len2);
-
-					result = ucol_strcoll(mylocale->info.icu.ucol,
-										  uchar1, ulen1,
-										  uchar2, ulen2);
-
-					pfree(uchar1);
-					pfree(uchar2);
-				}
-#else							/* not USE_ICU */
-				/* shouldn't happen */
-				elog(ERROR, "unsupported collprovider: %c", mylocale->provider);
-#endif							/* not USE_ICU */
-			}
-			else
-			{
-#ifdef HAVE_LOCALE_T
-				result = strcoll_l(a1p, a2p, mylocale->info.lt);
-#else
-				/* shouldn't happen */
-				elog(ERROR, "unsupported collprovider: %c", mylocale->provider);
-#endif
-			}
-		}
-		else
-			result = strcoll(a1p, a2p);
+		result = pg_strncoll(arg1, len1, arg2, len2, mylocale);
 
 		/* Break tie if necessary. */
 		if (result == 0 &&
 			(!mylocale || mylocale->deterministic))
-			result = strcmp(a1p, a2p);
-
-		if (a1p != a1buf)
-			pfree(a1p);
-		if (a2p != a2buf)
-			pfree(a2p);
+		{
+			result = memcmp(arg1, arg2, Min(len1, len2));
+			if ((result == 0) && (len1 != len2))
+				result = (len1 < len2) ? -1 : 1;
+		}
 	}
 
 	return result;
@@ -2074,20 +1915,6 @@ varstr_sortsupport(SortSupport ssup, Oid typid, Oid collid)
 		locale = pg_newlocale_from_collation(collid);
 
 		/*
-		 * There is a further exception on Windows.  When the database
-		 * encoding is UTF-8 and we are not using the C collation, complex
-		 * hacks are required.  We don't currently have a comparator that
-		 * handles that case, so we fall back on the slow method of having the
-		 * sort code invoke bttextcmp() (in the case of text) via the fmgr
-		 * trampoline.  ICU locales work just the same on Windows, however.
-		 */
-#ifdef WIN32
-		if (GetDatabaseEncoding() == PG_UTF8 &&
-			!(locale && locale->provider == COLLPROVIDER_ICU))
-			return;
-#endif
-
-		/*
 		 * We use varlenafastcmp_locale except for type NAME.
 		 */
 		if (typid == NAMEOID)
@@ -2102,13 +1929,7 @@ varstr_sortsupport(SortSupport ssup, Oid typid, Oid collid)
 
 	/*
 	 * Unfortunately, it seems that abbreviation for non-C collations is
-	 * broken on many common platforms; testing of multiple versions of glibc
-	 * reveals that, for many locales, strcoll() and strxfrm() do not return
-	 * consistent results, which is fatal to this optimization.  While no
-	 * other libc other than Cygwin has so far been shown to have a problem,
-	 * we take the conservative course of action for right now and disable
-	 * this categorically.  (Users who are certain this isn't a problem on
-	 * their system can define TRUST_STRXFRM.)
+	 * broken on many common platforms; see pg_strxfrm_enabled().
 	 *
 	 * Even apart from the risk of broken locales, it's possible that there
 	 * are platforms where the use of abbreviated keys should be disabled at
@@ -2121,10 +1942,8 @@ varstr_sortsupport(SortSupport ssup, Oid typid, Oid collid)
 	 * categorically, we may still want or need to disable it for particular
 	 * platforms.
 	 */
-#ifndef TRUST_STRXFRM
-	if (!collate_c && !(locale && locale->provider == COLLPROVIDER_ICU))
+	if (!collate_c && !pg_strxfrm_enabled(locale))
 		abbreviate = false;
-#endif
 
 	/*
 	 * If we're using abbreviated keys, or if we're using a locale-aware
@@ -2395,60 +2214,7 @@ varstrfastcmp_locale(char *a1p, int len1, char *a2p, int len2, SortSupport ssup)
 		return sss->last_returned;
 	}
 
-	if (sss->locale)
-	{
-		if (sss->locale->provider == COLLPROVIDER_ICU)
-		{
-#ifdef USE_ICU
-#ifdef HAVE_UCOL_STRCOLLUTF8
-			if (GetDatabaseEncoding() == PG_UTF8)
-			{
-				UErrorCode	status;
-
-				status = U_ZERO_ERROR;
-				result = ucol_strcollUTF8(sss->locale->info.icu.ucol,
-										  a1p, len1,
-										  a2p, len2,
-										  &status);
-				if (U_FAILURE(status))
-					ereport(ERROR,
-							(errmsg("collation failed: %s", u_errorName(status))));
-			}
-			else
-#endif
-			{
-				int32_t		ulen1,
-							ulen2;
-				UChar	   *uchar1,
-						   *uchar2;
-
-				ulen1 = icu_to_uchar(&uchar1, a1p, len1);
-				ulen2 = icu_to_uchar(&uchar2, a2p, len2);
-
-				result = ucol_strcoll(sss->locale->info.icu.ucol,
-									  uchar1, ulen1,
-									  uchar2, ulen2);
-
-				pfree(uchar1);
-				pfree(uchar2);
-			}
-#else							/* not USE_ICU */
-			/* shouldn't happen */
-			elog(ERROR, "unsupported collprovider: %c", sss->locale->provider);
-#endif							/* not USE_ICU */
-		}
-		else
-		{
-#ifdef HAVE_LOCALE_T
-			result = strcoll_l(sss->buf1, sss->buf2, sss->locale->info.lt);
-#else
-			/* shouldn't happen */
-			elog(ERROR, "unsupported collprovider: %c", sss->locale->provider);
-#endif
-		}
-	}
-	else
-		result = strcoll(sss->buf1, sss->buf2);
+	result = pg_strcoll(sss->buf1, sss->buf2, sss->locale);
 
 	/* Break tie if necessary. */
 	if (result == 0 &&
@@ -2471,6 +2237,7 @@ varstrfastcmp_locale(char *a1p, int len1, char *a2p, int len2, SortSupport ssup)
 static Datum
 varstr_abbrev_convert(Datum original, SortSupport ssup)
 {
+	const size_t max_prefix_bytes = sizeof(Datum);
 	VarStringSortSupport *sss = (VarStringSortSupport *) ssup->ssup_extra;
 	VarString  *authoritative = DatumGetVarStringPP(original);
 	char	   *authoritative_data = VARDATA_ANY(authoritative);
@@ -2483,7 +2250,7 @@ varstr_abbrev_convert(Datum original, SortSupport ssup)
 
 	pres = (char *) &res;
 	/* memset(), so any non-overwritten bytes are NUL */
-	memset(pres, 0, sizeof(Datum));
+	memset(pres, 0, max_prefix_bytes);
 	len = VARSIZE_ANY_EXHDR(authoritative);
 
 	/* Get number of bytes, ignoring trailing spaces */
@@ -2518,14 +2285,10 @@ varstr_abbrev_convert(Datum original, SortSupport ssup)
 	 * thing: explicitly consider string length.
 	 */
 	if (sss->collate_c)
-		memcpy(pres, authoritative_data, Min(len, sizeof(Datum)));
+		memcpy(pres, authoritative_data, Min(len, max_prefix_bytes));
 	else
 	{
 		Size		bsize;
-#ifdef USE_ICU
-		int32_t		ulen = -1;
-		UChar	   *uchar = NULL;
-#endif
 
 		/*
 		 * We're not using the C collation, so fall back on strxfrm or ICU
@@ -2543,7 +2306,7 @@ varstr_abbrev_convert(Datum original, SortSupport ssup)
 		if (sss->last_len1 == len && sss->cache_blob &&
 			memcmp(sss->buf1, authoritative_data, len) == 0)
 		{
-			memcpy(pres, sss->buf2, Min(sizeof(Datum), sss->last_len2));
+			memcpy(pres, sss->buf2, Min(max_prefix_bytes, sss->last_len2));
 			/* No change affecting cardinality, so no hashing required */
 			goto done;
 		}
@@ -2551,81 +2314,49 @@ varstr_abbrev_convert(Datum original, SortSupport ssup)
 		memcpy(sss->buf1, authoritative_data, len);
 
 		/*
-		 * Just like strcoll(), strxfrm() expects a NUL-terminated string. Not
-		 * necessary for ICU, but doesn't hurt.
+		 * pg_strxfrm() and pg_strxfrm_prefix expect NUL-terminated
+		 * strings.
 		 */
 		sss->buf1[len] = '\0';
 		sss->last_len1 = len;
 
-#ifdef USE_ICU
-		/* When using ICU and not UTF8, convert string to UChar. */
-		if (sss->locale && sss->locale->provider == COLLPROVIDER_ICU &&
-			GetDatabaseEncoding() != PG_UTF8)
-			ulen = icu_to_uchar(&uchar, sss->buf1, len);
-#endif
-
-		/*
-		 * Loop: Call strxfrm() or ucol_getSortKey(), possibly enlarge buffer,
-		 * and try again.  Both of these functions have the result buffer
-		 * content undefined if the result did not fit, so we need to retry
-		 * until everything fits, even though we only need the first few bytes
-		 * in the end.  When using ucol_nextSortKeyPart(), however, we only
-		 * ask for as many bytes as we actually need.
-		 */
-		for (;;)
+		if (pg_strxfrm_prefix_enabled(sss->locale))
 		{
-#ifdef USE_ICU
-			if (sss->locale && sss->locale->provider == COLLPROVIDER_ICU)
+			if (sss->buflen2 < max_prefix_bytes)
 			{
-				/*
-				 * When using UTF8, use the iteration interface so we only
-				 * need to produce as many bytes as we actually need.
-				 */
-				if (GetDatabaseEncoding() == PG_UTF8)
-				{
-					UCharIterator iter;
-					uint32_t	state[2];
-					UErrorCode	status;
-
-					uiter_setUTF8(&iter, sss->buf1, len);
-					state[0] = state[1] = 0;	/* won't need that again */
-					status = U_ZERO_ERROR;
-					bsize = ucol_nextSortKeyPart(sss->locale->info.icu.ucol,
-												 &iter,
-												 state,
-												 (uint8_t *) sss->buf2,
-												 Min(sizeof(Datum), sss->buflen2),
-												 &status);
-					if (U_FAILURE(status))
-						ereport(ERROR,
-								(errmsg("sort key generation failed: %s",
-										u_errorName(status))));
-				}
-				else
-					bsize = ucol_getSortKey(sss->locale->info.icu.ucol,
-											uchar, ulen,
-											(uint8_t *) sss->buf2, sss->buflen2);
+				sss->buflen2 = Max(max_prefix_bytes,
+								   Min(sss->buflen2 * 2, MaxAllocSize));
+				sss->buf2 = repalloc(sss->buf2, sss->buflen2);
 			}
-			else
-#endif
-#ifdef HAVE_LOCALE_T
-			if (sss->locale && sss->locale->provider == COLLPROVIDER_LIBC)
-				bsize = strxfrm_l(sss->buf2, sss->buf1,
-								  sss->buflen2, sss->locale->info.lt);
-			else
-#endif
-				bsize = strxfrm(sss->buf2, sss->buf1, sss->buflen2);
-
-			sss->last_len2 = bsize;
-			if (bsize < sss->buflen2)
-				break;
 
+			bsize = pg_strxfrm_prefix(sss->buf2, sss->buf1,
+									  max_prefix_bytes, sss->locale);
+		}
+		else
+		{
 			/*
-			 * Grow buffer and retry.
+			 * Loop: Call pg_strxfrm(), possibly enlarge buffer, and try
+			 * again.  The pg_strxfrm() function leaves the result buffer
+			 * content undefined if the result did not fit, so we need to
+			 * retry until everything fits, even though we only need the first
+			 * few bytes in the end.
 			 */
-			sss->buflen2 = Max(bsize + 1,
-							   Min(sss->buflen2 * 2, MaxAllocSize));
-			sss->buf2 = repalloc(sss->buf2, sss->buflen2);
+			for (;;)
+			{
+				bsize = pg_strxfrm(sss->buf2, sss->buf1, sss->buflen2,
+								   sss->locale);
+
+				sss->last_len2 = bsize;
+				if (bsize < sss->buflen2)
+					break;
+
+				/*
+				 * Grow buffer and retry.
+				 */
+				sss->buflen2 = Max(bsize + 1,
+								   Min(sss->buflen2 * 2, MaxAllocSize));
+				sss->buf2 = repalloc(sss->buf2, sss->buflen2);
+			}
 		}
 
 		/*
@@ -2637,12 +2368,7 @@ varstr_abbrev_convert(Datum original, SortSupport ssup)
 		 * (Actually, even if there were NUL bytes in the blob it would be
 		 * okay.  See remarks on bytea case above.)
 		 */
-		memcpy(pres, sss->buf2, Min(sizeof(Datum), bsize));
-
-#ifdef USE_ICU
-		if (uchar)
-			pfree(uchar);
-#endif
+		memcpy(pres, sss->buf2, Min(max_prefix_bytes, bsize));
 	}
 
 	/*
diff --git a/src/include/utils/pg_locale.h b/src/include/utils/pg_locale.h
index cede43440b5..def2b55f941 100644
--- a/src/include/utils/pg_locale.h
+++ b/src/include/utils/pg_locale.h
@@ -100,6 +100,19 @@ extern void make_icu_collator(const char *iculocstr,
 extern pg_locale_t pg_newlocale_from_collation(Oid collid);
 
 extern char *get_collation_actual_version(char collprovider, const char *collcollate);
+extern int pg_strcoll(const char *arg1, const char *arg2, pg_locale_t locale);
+extern int pg_strncoll(const char *arg1, size_t len1,
+					   const char *arg2, size_t len2, pg_locale_t locale);
+extern bool pg_strxfrm_enabled(pg_locale_t locale);
+extern size_t pg_strxfrm(char *dest, const char *src, size_t destsize,
+						 pg_locale_t locale);
+extern size_t pg_strnxfrm(char *dest, size_t destsize, const char *src,
+						  size_t srclen, pg_locale_t locale);
+extern bool pg_strxfrm_prefix_enabled(pg_locale_t locale);
+extern size_t pg_strxfrm_prefix(char *dest, const char *src, size_t destsize,
+								pg_locale_t locale);
+extern size_t pg_strnxfrm_prefix(char *dest, size_t destsize, const char *src,
+								 size_t srclen, pg_locale_t locale);
 
 #ifdef USE_ICU
 extern int32_t icu_to_uchar(UChar **buff_uchar, const char *buff, size_t nbytes);