1 files changed, 51 insertions, 0 deletions
diff --git a/src/test/regress/regress.c b/src/test/regress/regress.c
index aa9fef866fa..481588c9a44 100644
--- a/src/test/regress/regress.c
+++ b/src/test/regress/regress.c
@@ -29,6 +29,7 @@
 #include "commands/trigger.h"
 #include "executor/executor.h"
 #include "executor/spi.h"
+#include "mb/pg_wchar.h"
 #include "miscadmin.h"
 #include "nodes/supportnodes.h"
 #include "optimizer/optimizer.h"
@@ -1088,3 +1089,53 @@ test_opclass_options_func(PG_FUNCTION_ARGS)
 {
 	PG_RETURN_NULL();
 }
+
+/* one-time tests for encoding infrastructure */
+PG_FUNCTION_INFO_V1(test_enc_setup);
+Datum
+test_enc_setup(PG_FUNCTION_ARGS)
+{
+	/* Test pg_encoding_set_invalid() */
+	for (int i = 0; i < _PG_LAST_ENCODING_; i++)
+	{
+		char		buf[2],
+					bigbuf[16];
+		int			len,
+					mblen,
+					valid;
+
+		if (pg_encoding_max_length(i) == 1)
+			continue;
+		pg_encoding_set_invalid(i, buf);
+		len = strnlen(buf, 2);
+		if (len != 2)
+			elog(WARNING,
+				 "official invalid string for encoding \"%s\" has length %d",
+				 pg_enc2name_tbl[i].name, len);
+		mblen = pg_encoding_mblen(i, buf);
+		if (mblen != 2)
+			elog(WARNING,
+				 "official invalid string for encoding \"%s\" has mblen %d",
+				 pg_enc2name_tbl[i].name, mblen);
+		valid = pg_encoding_verifymbstr(i, buf, len);
+		if (valid != 0)
+			elog(WARNING,
+				 "official invalid string for encoding \"%s\" has valid prefix of length %d",
+				 pg_enc2name_tbl[i].name, valid);
+		valid = pg_encoding_verifymbstr(i, buf, 1);
+		if (valid != 0)
+			elog(WARNING,
+				 "first byte of official invalid string for encoding \"%s\" has valid prefix of length %d",
+				 pg_enc2name_tbl[i].name, valid);
+		memset(bigbuf, ' ', sizeof(bigbuf));
+		bigbuf[0] = buf[0];
+		bigbuf[1] = buf[1];
+		valid = pg_encoding_verifymbstr(i, bigbuf, sizeof(bigbuf));
+		if (valid != 0)
+			elog(WARNING,
+				 "trailing data changed official invalid string for encoding \"%s\" to have valid prefix of length %d",
+				 pg_enc2name_tbl[i].name, valid);
+	}
+
+	PG_RETURN_VOID();
+}