Add STANDARDS, ENVIRONMENT, and TABLES sections.

Obtained from:	OpenBSD

usr.bin/yacc/yacc.1

@@ -34,6 +34,7 @@
 .\"
 .\"     @(#)yacc.1	5.8 (Berkeley) 5/24/93
 .\" $FreeBSD$
+.\"	$OpenBSD: yacc.1,v 1.14 2001/05/01 17:58:05 aaron Exp $
 .\"
 .Dd May 24, 1993
 .Dt YACC 1
@@ -115,13 +116,31 @@ Cause a human-readable description of the generated parser to
 be written to the file
 .Pa y.output .
 .El
-.Pp
-If the environment variable
-.Ev TMPDIR
-is set, the string denoted by
-.Ev TMPDIR
-will be used as the name of the directory where the temporary
-files are created.
+.Sh ENVIRONMENT
+.Bl -tag -width TMPDIR
+.It Ev TMPDIR
+Name of directory where temporary files are to be created.
+.Sh TABLES
+The names of the tables generated by this version of
+.Nm
+are
+.Dq yylhs ,
+.Dq yylen ,
+.Dq yydefred ,
+.Dq yydgoto ,
+.Dq yysindex ,
+.Dq yyrindex ,
+.Dq yygindex ,
+.Dq yytable ,
+and
+.Dq yycheck .
+Two additional tables,
+.Dq yyname
+and
+.Dq yyrule ,
+are created if
+.Dv YYDEBUG
+is defined and non-zero.
 .Sh FILES
 .Bl -tag -width /tmp/yacc.aXXXXXXXXXX -compact
 .It Pa y.code.c
@@ -133,7 +152,16 @@ files are created.
 .It Pa /tmp/yacc.uXXXXXXXXXX
 .El
 .Sh DIAGNOSTICS
-If there are rules that are never reduced, the number of such rules is
-reported on standard error.
-If there are any LALR(1) conflicts, the number of conflicts is reported
-on standard error.
+If there are rules that are never reduced,
+the number of such rules is reported on standard error.
+If there are any
+.Tn LALR(1)
+conflicts,
+the number of conflicts is reported on standard error.
+.Sh SEE ALSO
+.Xr yyfix 1
+.Sh STANDARDS
+The
+.Nm
+utility conforms to
+.St -p1003.2 .