Change phrasing of input error message.

Add istrue() and isfalse() routines to implement SQL3 IS TRUE and IS FALSE.

src/backend/utils/adt/bool.c

@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/utils/adt/bool.c,v 1.10 1997/10/30 16:45:12 thomas Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/utils/adt/bool.c,v 1.11 1997/11/07 06:30:20 thomas Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -72,7 +72,8 @@ boolin(char *b)
 			break;
 	}
 
-	elog(WARN,"Invalid input string '%s'\n", b);
+	elog(WARN,"Bad boolean external representation '%s'", b);
+	/* not reached */
 	return (FALSE);
 } /* boolin() */
 
@@ -89,6 +90,7 @@ boolout(bool b)
 	return (result);
 } /* boolout() */
 
+
 /*****************************************************************************
  *	 PUBLIC ROUTINES														 *
  *****************************************************************************/
@@ -127,4 +129,4 @@ bool
 isfalse(bool arg1)
 {
 	return(arg1 != TRUE);
-} /* istrue() */
+} /* isfalse() */