From 7184a428a2f8d78b3165f7939e3f44ade01a90f2 Mon Sep 17 00:00:00 2001
From: Bruce Momjian <bruce@momjian.us>
Date: Thu, 12 Sep 2002 00:26:42 +0000
Subject: [PATCH] The small context diff below corrects what seems to be an
 oversight in fmgr.h - it's discouraged to access fcinfo directly but there is
 no macro to get the number of arguments passed to the function. Checking the
 number of arguments is often useful when you have a function which can be
 called like:

 func('arg');
 func(null);
 func();

all mapping to the same C function.

the macro has a function-like appearance to match the other PG_*
macros.

Lee Kindness.
---
 src/include/fmgr.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/include/fmgr.h b/src/include/fmgr.h
index a421ba903a..0e58167589 100644
--- a/src/include/fmgr.h
+++ b/src/include/fmgr.h
@@ -11,7 +11,7 @@
  * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: fmgr.h,v 1.24 2002/09/04 20:31:36 momjian Exp $
+ * $Id: fmgr.h,v 1.25 2002/09/12 00:26:42 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -115,6 +115,11 @@ extern void fmgr_info_copy(FmgrInfo *dstinfo, FmgrInfo *srcinfo,
 /* Standard parameter list for fmgr-compatible functions */
 #define PG_FUNCTION_ARGS	FunctionCallInfo fcinfo
 
+/*
+ * Get number of arguments passed to function.
+ */
+#define PG_NARGS() (fcinfo->nargs)
+
 /*
  * If function is not marked "proisstrict" in pg_proc, it must check for
  * null arguments using this macro.  Do not try to GETARG a null argument!