--- /dev/null	Tue Jul 15 13:48:06 2014
+++ new/usr/src/cmd/mandoc/man_macro.c	Tue Jul 15 13:48:06 2014
@@ -0,0 +1,484 @@
+/*	$Id: man_macro.c,v 1.71 2012/01/03 15:16:24 kristaps Exp $ */
+/*
+ * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <assert.h>
+#include <ctype.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "man.h"
+#include "mandoc.h"
+#include "libmandoc.h"
+#include "libman.h"
+
+enum	rew {
+	REW_REWIND,
+	REW_NOHALT,
+	REW_HALT
+};
+
+static	int		 blk_close(MACRO_PROT_ARGS);
+static	int		 blk_exp(MACRO_PROT_ARGS);
+static	int		 blk_imp(MACRO_PROT_ARGS);
+static	int		 in_line_eoln(MACRO_PROT_ARGS);
+static	int		 man_args(struct man *, int, 
+				int *, char *, char **);
+
+static	int		 rew_scope(enum man_type, 
+				struct man *, enum mant);
+static	enum rew	 rew_dohalt(enum mant, enum man_type, 
+				const struct man_node *);
+static	enum rew	 rew_block(enum mant, enum man_type, 
+				const struct man_node *);
+static	void		 rew_warn(struct man *, 
+				struct man_node *, enum mandocerr);
+
+const	struct man_macro __man_macros[MAN_MAX] = {
+	{ in_line_eoln, MAN_NSCOPED }, /* br */
+	{ in_line_eoln, MAN_BSCOPE }, /* TH */
+	{ blk_imp, MAN_BSCOPE | MAN_SCOPED }, /* SH */
+	{ blk_imp, MAN_BSCOPE | MAN_SCOPED }, /* SS */
+	{ blk_imp, MAN_BSCOPE | MAN_SCOPED | MAN_FSCOPED }, /* TP */
+	{ blk_imp, MAN_BSCOPE }, /* LP */
+	{ blk_imp, MAN_BSCOPE }, /* PP */
+	{ blk_imp, MAN_BSCOPE }, /* P */
+	{ blk_imp, MAN_BSCOPE }, /* IP */
+	{ blk_imp, MAN_BSCOPE }, /* HP */
+	{ in_line_eoln, MAN_SCOPED }, /* SM */
+	{ in_line_eoln, MAN_SCOPED }, /* SB */
+	{ in_line_eoln, 0 }, /* BI */
+	{ in_line_eoln, 0 }, /* IB */
+	{ in_line_eoln, 0 }, /* BR */
+	{ in_line_eoln, 0 }, /* RB */
+	{ in_line_eoln, MAN_SCOPED }, /* R */
+	{ in_line_eoln, MAN_SCOPED }, /* B */
+	{ in_line_eoln, MAN_SCOPED }, /* I */
+	{ in_line_eoln, 0 }, /* IR */
+	{ in_line_eoln, 0 }, /* RI */
+	{ in_line_eoln, MAN_NSCOPED }, /* na */
+	{ in_line_eoln, MAN_NSCOPED }, /* sp */
+	{ in_line_eoln, MAN_BSCOPE }, /* nf */
+	{ in_line_eoln, MAN_BSCOPE }, /* fi */
+	{ blk_close, 0 }, /* RE */
+	{ blk_exp, MAN_EXPLICIT }, /* RS */
+	{ in_line_eoln, 0 }, /* DT */
+	{ in_line_eoln, 0 }, /* UC */
+	{ in_line_eoln, 0 }, /* PD */
+	{ in_line_eoln, 0 }, /* AT */
+	{ in_line_eoln, 0 }, /* in */
+	{ in_line_eoln, 0 }, /* ft */
+	{ in_line_eoln, 0 }, /* OP */
+};
+
+const	struct man_macro * const man_macros = __man_macros;
+
+
+/*
+ * Warn when "n" is an explicit non-roff macro.
+ */
+static void
+rew_warn(struct man *m, struct man_node *n, enum mandocerr er)
+{
+
+	if (er == MANDOCERR_MAX || MAN_BLOCK != n->type)
+		return;
+	if (MAN_VALID & n->flags)
+		return;
+	if ( ! (MAN_EXPLICIT & man_macros[n->tok].flags))
+		return;
+
+	assert(er < MANDOCERR_FATAL);
+	man_nmsg(m, n, er);
+}
+
+
+/*
+ * Rewind scope.  If a code "er" != MANDOCERR_MAX has been provided, it
+ * will be used if an explicit block scope is being closed out.
+ */
+int
+man_unscope(struct man *m, const struct man_node *to, 
+		enum mandocerr er)
+{
+	struct man_node	*n;
+
+	assert(to);
+
+	m->next = MAN_NEXT_SIBLING;
+
+	/* LINTED */
+	while (m->last != to) {
+		/*
+		 * Save the parent here, because we may delete the
+		 * m->last node in the post-validation phase and reset
+		 * it to m->last->parent, causing a step in the closing
+		 * out to be lost.
+		 */
+		n = m->last->parent;
+		rew_warn(m, m->last, er);
+		if ( ! man_valid_post(m))
+			return(0);
+		m->last = n;
+		assert(m->last);
+	}
+
+	rew_warn(m, m->last, er);
+	if ( ! man_valid_post(m))
+		return(0);
+
+	return(1);
+}
+
+
+static enum rew
+rew_block(enum mant ntok, enum man_type type, const struct man_node *n)
+{
+
+	if (MAN_BLOCK == type && ntok == n->parent->tok && 
+			MAN_BODY == n->parent->type)
+		return(REW_REWIND);
+	return(ntok == n->tok ? REW_HALT : REW_NOHALT);
+}
+
+
+/*
+ * There are three scope levels: scoped to the root (all), scoped to the
+ * section (all less sections), and scoped to subsections (all less
+ * sections and subsections).
+ */
+static enum rew 
+rew_dohalt(enum mant tok, enum man_type type, const struct man_node *n)
+{
+	enum rew	 c;
+
+	/* We cannot progress beyond the root ever. */
+	if (MAN_ROOT == n->type)
+		return(REW_HALT);
+
+	assert(n->parent);
+
+	/* Normal nodes shouldn't go to the level of the root. */
+	if (MAN_ROOT == n->parent->type)
+		return(REW_REWIND);
+
+	/* Already-validated nodes should be closed out. */
+	if (MAN_VALID & n->flags)
+		return(REW_NOHALT);
+
+	/* First: rewind to ourselves. */
+	if (type == n->type && tok == n->tok)
+		return(REW_REWIND);
+
+	/* 
+	 * Next follow the implicit scope-smashings as defined by man.7:
+	 * section, sub-section, etc.
+	 */
+
+	switch (tok) {
+	case (MAN_SH):
+		break;
+	case (MAN_SS):
+		/* Rewind to a section, if a block. */
+		if (REW_NOHALT != (c = rew_block(MAN_SH, type, n)))
+			return(c);
+		break;
+	case (MAN_RS):
+		/* Rewind to a subsection, if a block. */
+		if (REW_NOHALT != (c = rew_block(MAN_SS, type, n)))
+			return(c);
+		/* Rewind to a section, if a block. */
+		if (REW_NOHALT != (c = rew_block(MAN_SH, type, n)))
+			return(c);
+		break;
+	default:
+		/* Rewind to an offsetter, if a block. */
+		if (REW_NOHALT != (c = rew_block(MAN_RS, type, n)))
+			return(c);
+		/* Rewind to a subsection, if a block. */
+		if (REW_NOHALT != (c = rew_block(MAN_SS, type, n)))
+			return(c);
+		/* Rewind to a section, if a block. */
+		if (REW_NOHALT != (c = rew_block(MAN_SH, type, n)))
+			return(c);
+		break;
+	}
+
+	return(REW_NOHALT);
+}
+
+
+/*
+ * Rewinding entails ascending the parse tree until a coherent point,
+ * for example, the `SH' macro will close out any intervening `SS'
+ * scopes.  When a scope is closed, it must be validated and actioned.
+ */
+static int
+rew_scope(enum man_type type, struct man *m, enum mant tok)
+{
+	struct man_node	*n;
+	enum rew	 c;
+
+	/* LINTED */
+	for (n = m->last; n; n = n->parent) {
+		/* 
+		 * Whether we should stop immediately (REW_HALT), stop
+		 * and rewind until this point (REW_REWIND), or keep
+		 * rewinding (REW_NOHALT).
+		 */
+		c = rew_dohalt(tok, type, n);
+		if (REW_HALT == c)
+			return(1);
+		if (REW_REWIND == c)
+			break;
+	}
+
+	/* 
+	 * Rewind until the current point.  Warn if we're a roff
+	 * instruction that's mowing over explicit scopes.
+	 */
+	assert(n);
+
+	return(man_unscope(m, n, MANDOCERR_MAX));
+}
+
+
+/*
+ * Close out a generic explicit macro.
+ */
+/* ARGSUSED */
+int
+blk_close(MACRO_PROT_ARGS)
+{
+	enum mant	 	 ntok;
+	const struct man_node	*nn;
+
+	switch (tok) {
+	case (MAN_RE):
+		ntok = MAN_RS;
+		break;
+	default:
+		abort();
+		/* NOTREACHED */
+	}
+
+	for (nn = m->last->parent; nn; nn = nn->parent)
+		if (ntok == nn->tok)
+			break;
+
+	if (NULL == nn)
+		man_pmsg(m, line, ppos, MANDOCERR_NOSCOPE);
+
+	if ( ! rew_scope(MAN_BODY, m, ntok))
+		return(0);
+	if ( ! rew_scope(MAN_BLOCK, m, ntok))
+		return(0);
+
+	return(1);
+}
+
+
+/* ARGSUSED */
+int
+blk_exp(MACRO_PROT_ARGS)
+{
+	int		 la;
+	char		*p;
+
+	/* 
+	 * Close out prior scopes.  "Regular" explicit macros cannot be
+	 * nested, but we allow roff macros to be placed just about
+	 * anywhere.
+	 */
+
+	if ( ! man_block_alloc(m, line, ppos, tok))
+		return(0);
+	if ( ! man_head_alloc(m, line, ppos, tok))
+		return(0);
+
+	for (;;) {
+		la = *pos;
+		if ( ! man_args(m, line, pos, buf, &p))
+			break;
+		if ( ! man_word_alloc(m, line, la, p))
+			return(0);
+	}
+
+	assert(m);
+	assert(tok != MAN_MAX);
+
+	if ( ! rew_scope(MAN_HEAD, m, tok))
+		return(0);
+	return(man_body_alloc(m, line, ppos, tok));
+}
+
+
+
+/*
+ * Parse an implicit-block macro.  These contain a MAN_HEAD and a
+ * MAN_BODY contained within a MAN_BLOCK.  Rules for closing out other
+ * scopes, such as `SH' closing out an `SS', are defined in the rew
+ * routines.
+ */
+/* ARGSUSED */
+int
+blk_imp(MACRO_PROT_ARGS)
+{
+	int		 la;
+	char		*p;
+	struct man_node	*n;
+
+	/* Close out prior scopes. */
+
+	if ( ! rew_scope(MAN_BODY, m, tok))
+		return(0);
+	if ( ! rew_scope(MAN_BLOCK, m, tok))
+		return(0);
+
+	/* Allocate new block & head scope. */
+
+	if ( ! man_block_alloc(m, line, ppos, tok))
+		return(0);
+	if ( ! man_head_alloc(m, line, ppos, tok))
+		return(0);
+
+	n = m->last;
+
+	/* Add line arguments. */
+
+	for (;;) {
+		la = *pos;
+		if ( ! man_args(m, line, pos, buf, &p))
+			break;
+		if ( ! man_word_alloc(m, line, la, p))
+			return(0);
+	}
+
+	/* Close out head and open body (unless MAN_SCOPE). */
+
+	if (MAN_SCOPED & man_macros[tok].flags) {
+		/* If we're forcing scope (`TP'), keep it open. */
+		if (MAN_FSCOPED & man_macros[tok].flags) {
+			m->flags |= MAN_BLINE;
+			return(1);
+		} else if (n == m->last) {
+			m->flags |= MAN_BLINE;
+			return(1);
+		}
+	}
+
+	if ( ! rew_scope(MAN_HEAD, m, tok))
+		return(0);
+	return(man_body_alloc(m, line, ppos, tok));
+}
+
+
+/* ARGSUSED */
+int
+in_line_eoln(MACRO_PROT_ARGS)
+{
+	int		 la;
+	char		*p;
+	struct man_node	*n;
+
+	if ( ! man_elem_alloc(m, line, ppos, tok))
+		return(0);
+
+	n = m->last;
+
+	for (;;) {
+		la = *pos;
+		if ( ! man_args(m, line, pos, buf, &p))
+			break;
+		if ( ! man_word_alloc(m, line, la, p))
+			return(0);
+	}
+
+	/*
+	 * If no arguments are specified and this is MAN_SCOPED (i.e.,
+	 * next-line scoped), then set our mode to indicate that we're
+	 * waiting for terms to load into our context.
+	 */
+
+	if (n == m->last && MAN_SCOPED & man_macros[tok].flags) {
+		assert( ! (MAN_NSCOPED & man_macros[tok].flags));
+		m->flags |= MAN_ELINE;
+		return(1);
+	} 
+
+	/* Set ignorable context, if applicable. */
+
+	if (MAN_NSCOPED & man_macros[tok].flags) {
+		assert( ! (MAN_SCOPED & man_macros[tok].flags));
+		m->flags |= MAN_ILINE;
+	}
+
+	assert(MAN_ROOT != m->last->type);
+	m->next = MAN_NEXT_SIBLING;
+	
+	/*
+	 * Rewind our element scope.  Note that when TH is pruned, we'll
+	 * be back at the root, so make sure that we don't clobber as
+	 * its sibling.
+	 */
+
+	for ( ; m->last; m->last = m->last->parent) {
+		if (m->last == n)
+			break;
+		if (m->last->type == MAN_ROOT)
+			break;
+		if ( ! man_valid_post(m))
+			return(0);
+	}
+
+	assert(m->last);
+
+	/*
+	 * Same here regarding whether we're back at the root. 
+	 */
+
+	if (m->last->type != MAN_ROOT && ! man_valid_post(m))
+		return(0);
+
+	return(1);
+}
+
+
+int
+man_macroend(struct man *m)
+{
+
+	return(man_unscope(m, m->first, MANDOCERR_SCOPEEXIT));
+}
+
+static int
+man_args(struct man *m, int line, int *pos, char *buf, char **v)
+{
+	char	 *start;
+
+	assert(*pos);
+	*v = start = buf + *pos;
+	assert(' ' != *start);
+
+	if ('\0' == *start)
+		return(0);
+
+	*v = mandoc_getarg(m->parse, v, line, pos);
+	return(1);
+}
