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Commit7184a42

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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 nomacro to get the number of arguments passed to the function. Checkingthe number of arguments is often useful when you have a function whichcan 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.
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‎src/include/fmgr.h

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

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