3 files changed, 88 insertions, 0 deletions
diff --git a/src/backend/utils/mb/Makefile b/src/backend/utils/mb/Makefile
index 18dd758cfe..cd4a016449 100644
--- a/src/backend/utils/mb/Makefile
+++ b/src/backend/utils/mb/Makefile
@@ -16,6 +16,7 @@ OBJS = \
 	conv.o \
 	encnames.o \
 	mbutils.o \
+	stringinfo_mb.o \
 	wchar.o \
 	wstrcmp.o \
 	wstrncmp.o
diff --git a/src/backend/utils/mb/README b/src/backend/utils/mb/README
index c9bc6e6f8d..7495ca5db2 100644
--- a/src/backend/utils/mb/README
+++ b/src/backend/utils/mb/README
@@ -9,6 +9,7 @@ wchar.c:	mostly static functions and a public table for mb string and
 		multibyte conversion
 mbutils.c:	public functions for the backend only.
 		requires conv.c and wchar.c
+stringinfo_mb.c: public backend-only multibyte-aware stringinfo functions
 wstrcmp.c:	strcmp for mb
 wstrncmp.c:	strncmp for mb
 win866.c:	a tool to generate KOI8 <--> CP866 conversion table
diff --git a/src/backend/utils/mb/stringinfo_mb.c b/src/backend/utils/mb/stringinfo_mb.c
new file mode 100644
index 0000000000..51bb051206
--- /dev/null
+++ b/src/backend/utils/mb/stringinfo_mb.c
@@ -0,0 +1,86 @@
+/*-------------------------------------------------------------------------
+ *
+ * stringinfo_mb.c
+ *		Multibyte encoding-aware additional StringInfo facilites
+ *
+ * This is separate from common/stringinfo.c so that frontend users
+ * of that file need not pull in unnecessary multibyte-encoding support
+ * code.
+ *
+ *
+ * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ *
+ * IDENTIFICATION
+ *	  src/backend/utils/mb/stringinfo_mb.c
+ *
+ *-------------------------------------------------------------------------
+ */
+#include "postgres.h"
+
+#include "mb/stringinfo_mb.h"
+#include "mb/pg_wchar.h"
+
+
+/*
+ * appendStringInfoStringQuoted
+ *
+ * Append up to maxlen characters from s to str, or the whole input string if
+ * maxlen <= 0, adding single quotes around it and doubling all single quotes.
+ * Add an ellipsis if the copy is incomplete.
+ */
+void
+appendStringInfoStringQuoted(StringInfo str, const char *s, int maxlen)
+{
+	char	   *copy = NULL;
+	const char *chunk_search_start,
+			   *chunk_copy_start,
+			   *chunk_end;
+	int			slen;
+	bool		ellipsis;
+
+	Assert(str != NULL);
+
+	slen = strlen(s);
+	if (maxlen > 0 && maxlen < slen)
+	{
+		int		finallen = pg_mbcliplen(s, slen, maxlen);
+
+		copy = pnstrdup(s, finallen);
+		chunk_search_start = copy;
+		chunk_copy_start = copy;
+
+		ellipsis = true;
+	}
+	else
+	{
+		chunk_search_start = s;
+		chunk_copy_start = s;
+
+		ellipsis = false;
+	}
+
+	appendStringInfoCharMacro(str, '\'');
+
+	while ((chunk_end = strchr(chunk_search_start, '\'')) != NULL)
+	{
+		/* copy including the found delimiting ' */
+		appendBinaryStringInfoNT(str,
+								 chunk_copy_start,
+								 chunk_end - chunk_copy_start + 1);
+
+		/* in order to double it, include this ' into the next chunk as well */
+		chunk_copy_start = chunk_end;
+		chunk_search_start = chunk_end + 1;
+	}
+
+	/* copy the last chunk and terminate */
+	if (ellipsis)
+		appendStringInfo(str, "%s...'", chunk_copy_start);
+	else
+		appendStringInfo(str, "%s'", chunk_copy_start);
+
+	if (copy)
+		pfree(copy);
+}