move hex_decode() to /common so it can be called from frontend

This allows removal of a copy of hex_decode() from ecpg, and will be
used by the soon-to-be added pg_alterckey command.

Backpatch-through: master

2 files changed, 16 insertions, 1 deletions

diff --git a/src/include/common/hex_decode.h b/src/include/common/hex_decode.h
new file mode 100644
index 0000000000..1f99f069b2
--- /dev/null
+++ b/src/include/common/hex_decode.h
@@ -0,0 +1,16 @@
+/*
+ *	hex_decode.h
+ *		hex decoding
+ *
+ *	Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ *	Portions Copyright (c) 1994, Regents of the University of California
+ *
+ *	src/include/common/hex_decode.h
+ */
+#ifndef COMMON_HEX_DECODE_H
+#define COMMON_HEX_DECODE_H
+
+extern uint64 hex_decode(const char *src, size_t len, char *dst);
+
+
+#endif							/* COMMON_HEX_DECODE_H */
diff --git a/src/include/utils/builtins.h b/src/include/utils/builtins.h
index 4db5ad3f12..19271e0696 100644
--- a/src/include/utils/builtins.h
+++ b/src/include/utils/builtins.h
@@ -33,7 +33,6 @@ extern int	errdomainconstraint(Oid datatypeOid, const char *conname);
 
 /* encode.c */
 extern uint64 hex_encode(const char *src, size_t len, char *dst);
-extern uint64 hex_decode(const char *src, size_t len, char *dst);
 
 /* int.c */
 extern int2vector *buildint2vector(const int16 *int2s, int n);