Postgres95 1.01 Distribution - Virgin Sources

src/backend/utils/adt/regproc.c

@@ -0,0 +1,159 @@
+/*-------------------------------------------------------------------------
+ *
+ * regproc.c--
+ *    Functions for the built-in type "RegProcedure".
+ *
+ * Copyright (c) 1994, Regents of the University of California
+ *
+ *
+ * IDENTIFICATION
+ *    $Header: /cvsroot/pgsql/src/backend/utils/adt/regproc.c,v 1.1.1.1 1996/07/09 06:22:05 scrappy Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+#include <string.h>
+#include "postgres.h"
+#include "access/heapam.h"
+#include "access/relscan.h"
+#include "access/skey.h"
+#include "utils/tqual.h"	/* for NowTimeQual */
+#include "fmgr.h"
+#include "utils/elog.h"
+#include "utils/palloc.h"
+
+#include "catalog/catname.h"
+#include "utils/builtins.h"	/* where function declarations go */
+
+/***************************************************************************** 
+ *   USER I/O ROUTINES                                                       *
+ *****************************************************************************/
+
+/*
+ *	regprocin	- converts "proname" to proid
+ *
+ *	proid of NULL signifies unknown
+ */
+int32 regprocin(char *proname)
+{
+    Relation	proc;
+    HeapScanDesc	procscan;
+    HeapTuple	proctup;
+    ScanKeyData	       key;		
+    RegProcedure	result;
+    bool		isnull;
+    
+    if (proname == NULL)
+	return(0);
+    proc = heap_openr(ProcedureRelationName);
+    if (!RelationIsValid(proc)) {
+	elog(WARN, "regprocin: could not open %s",
+	     ProcedureRelationName);
+	return(0);
+    }
+    ScanKeyEntryInitialize(&key,
+			   (bits16)0, 
+			   (AttrNumber)1, 
+			   (RegProcedure)F_CHAR16EQ,
+			   (Datum)proname);
+    
+    procscan = heap_beginscan(proc, 0, NowTimeQual, 1, &key);
+    if (!HeapScanIsValid(procscan)) {
+	heap_close(proc);
+	elog(WARN, "regprocin: could not being scan of %s",
+	     ProcedureRelationName);
+	return(0);
+    }
+    proctup = heap_getnext(procscan, 0, (Buffer *) NULL);
+    switch (HeapTupleIsValid(proctup)) {
+    case 1:
+	result = (RegProcedure) heap_getattr(proctup,
+					  InvalidBuffer,
+					  ObjectIdAttributeNumber,
+					  RelationGetTupleDescriptor(proc),
+					  &isnull);
+	if (isnull) {
+	    elog(FATAL, "regprocin: null procedure %s", proname);
+	}
+	break;
+    case 0:
+	result = (RegProcedure) 0;
+#ifdef	EBUG
+	elog(DEBUG, "regprocin: no such procedure %s", proname);
+#endif	/* defined(EBUG) */
+    }
+    heap_endscan(procscan);
+    heap_close(proc);
+    return((int32) result);
+}
+
+/*
+ *	regprocout	- converts proid to "proname"
+ */
+char *regprocout(RegProcedure proid)
+{
+    Relation	proc;
+    HeapScanDesc	procscan;
+    HeapTuple	proctup;
+    char		*result;
+    ScanKeyData	key;
+    
+    result = (char *)palloc(NAMEDATALEN);
+    proc = heap_openr(ProcedureRelationName);
+    if (!RelationIsValid(proc)) {
+	elog(WARN, "regprocout: could not open %s",
+	     ProcedureRelationName);
+	return(0);
+    }
+    ScanKeyEntryInitialize(&key,
+			   (bits16)0,
+			   (AttrNumber)ObjectIdAttributeNumber,
+			   (RegProcedure)F_INT4EQ,
+			   (Datum)proid);
+    
+    procscan = heap_beginscan(proc, 0, NowTimeQual, 1, &key);
+    if (!HeapScanIsValid(procscan)) {
+	heap_close(proc);
+	elog(WARN, "regprocin: could not being scan of %s",
+	     ProcedureRelationName);
+	return(0);
+    }
+    proctup = heap_getnext(procscan, 0, (Buffer *)NULL);
+    switch (HeapTupleIsValid(proctup)) {
+	char	*s;
+	bool	isnull;
+    case 1:
+	s = (char *) heap_getattr(proctup, InvalidBuffer, 1,
+				  RelationGetTupleDescriptor(proc), &isnull);
+	if (!isnull) {
+	    strncpy(result, s, 16);
+	    break;
+	}
+	elog(FATAL, "regprocout: null procedure %d", proid);
+	/*FALLTHROUGH*/
+    case 0:
+	memset(result, 0, 16);
+	result[0] = '-';
+#ifdef	EBUG
+	elog(DEBUG, "regprocout: no such procedure %d", proid);
+#endif	/* defined(EBUG) */
+    }
+    heap_endscan(procscan);
+    heap_close(proc);
+    return(result);
+}
+
+
+/***************************************************************************** 
+ *   PUBLIC ROUTINES                                                         *
+ *****************************************************************************/
+
+Oid RegprocToOid(RegProcedure rp)
+{
+    return (Oid)rp;
+}
+
+/* (see int.c for comparison/operation routines) */
+
+
+/* ========== PRIVATE ROUTINES ========== */
+