===================================================================
RCS file: /cvs/mandoc/mandoc.h,v
retrieving revision 1.15
retrieving revision 1.16
diff -u -p -r1.15 -r1.16
--- mandoc/mandoc.h	2010/07/02 12:54:33	1.15
+++ mandoc/mandoc.h	2010/07/05 20:10:22	1.16
@@ -1,4 +1,4 @@
-/*	$Id: mandoc.h,v 1.15 2010/07/02 12:54:33 kristaps Exp $ */
+/*	$Id: mandoc.h,v 1.16 2010/07/05 20:10:22 kristaps Exp $ */
 /*
  * Copyright (c) 2010 Kristaps Dzonsons <kristaps@bsd.lv>
  *
@@ -17,10 +17,13 @@
 #ifndef MANDOC_H
 #define MANDOC_H
 
+/*
+ * This contains declarations that are available system-wide.
+ */
+
 #define ASCII_NBRSP	 31  /* non-breaking space */
 #define	ASCII_HYPH	 30  /* breakable hyphen */
 
-
 __BEGIN_DECLS
 
 enum	mandocerr {
@@ -106,8 +109,39 @@ enum	mandocerr {
 	MANDOCERR_MAX
 };
 
-typedef	int	(*mandocmsg)(enum mandocerr, 
-			void *, int, int, const char *);
+enum	regs {
+	REG_nS = 0,	/* register: nS */
+	REG__MAX
+};
+
+/*
+ * A single register entity.  If "set" is zero, the value of the
+ * register should be the default one, which is per-register.  It's
+ * assumed that callers know which type in "v" corresponds to which
+ * register value.
+ */
+struct	reg {
+	int		  set; /* whether set or not */
+	union {
+		unsigned  u; /* unsigned integer */
+	} v;
+};
+
+/*
+ * The primary interface to setting register values is in libroff,
+ * although libmdoc and libman from time to time will manipulate
+ * registers (such as `.Sh SYNOPSIS' enabling REG_nS).
+ */
+struct	regset {
+	struct reg	  regs[REG__MAX];
+};
+
+/*
+ * Callback function for warnings, errors, and fatal errors as they
+ * occur in the compilers libroff, libmdoc, and libman.
+ */
+typedef	int		(*mandocmsg)(enum mandocerr, void *,
+				int, int, const char *);
 
 __END_DECLS