===================================================================
RCS file: /cvs/mandoc/mdoc.c,v
retrieving revision 1.266
retrieving revision 1.269
diff -u -p -r1.266 -r1.269
--- mandoc/mdoc.c	2017/06/07 20:58:49	1.266
+++ mandoc/mdoc.c	2018/08/17 20:33:37	1.269
@@ -1,7 +1,7 @@
-/*	$Id: mdoc.c,v 1.266 2017/06/07 20:58:49 schwarze Exp $ */
+/*	$Id: mdoc.c,v 1.269 2018/08/17 20:33:37 schwarze Exp $ */
 /*
  * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
- * Copyright (c) 2010, 2012-2017 Ingo Schwarze <schwarze@openbsd.org>
+ * Copyright (c) 2010, 2012-2018 Ingo Schwarze <schwarze@openbsd.org>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -80,13 +80,6 @@ mdoc_parseln(struct roff_man *mdoc, int ln, char *buf,
 }
 
 void
-mdoc_macro(MACRO_PROT_ARGS)
-{
-	assert(tok >= MDOC_Dd && tok < MDOC_MAX);
-	(*mdoc_macros[tok].fp)(mdoc, tok, line, ppos, pos, buf);
-}
-
-void
 mdoc_tail_alloc(struct roff_man *mdoc, int line, int pos, enum roff_tok tok)
 {
 	struct roff_node *p;
@@ -179,6 +172,7 @@ static int
 mdoc_ptext(struct roff_man *mdoc, int line, char *buf, int offs)
 {
 	struct roff_node *n;
+	const char	 *cp, *sp;
 	char		 *c, *ws, *end;
 
 	n = mdoc->last;
@@ -195,7 +189,8 @@ mdoc_ptext(struct roff_man *mdoc, int line, char *buf,
 	    (n->parent != NULL && n->parent->tok == MDOC_Bl &&
 	     n->parent->norm->Bl.type == LIST_column)) {
 		mdoc->flags |= MDOC_FREECOL;
-		mdoc_macro(mdoc, MDOC_It, line, offs, &offs, buf);
+		(*mdoc_macro(MDOC_It)->fp)(mdoc, MDOC_It,
+		    line, offs, &offs, buf);
 		return 1;
 	}
 
@@ -244,15 +239,30 @@ mdoc_ptext(struct roff_man *mdoc, int line, char *buf,
 		mandoc_msg(MANDOCERR_SPACE_EOL, mdoc->parse,
 		    line, (int)(ws-buf), NULL);
 
+	/*
+	 * Blank lines are allowed in no-fill mode
+	 * and cancel preceding \c,
+	 * but add a single vertical space elsewhere.
+	 */
+
 	if (buf[offs] == '\0' && ! (mdoc->flags & MDOC_LITERAL)) {
+		switch (mdoc->last->type) {
+		case ROFFT_TEXT:
+			sp = mdoc->last->string;
+			cp = end = strchr(sp, '\0') - 2;
+			if (cp < sp || cp[0] != '\\' || cp[1] != 'c')
+				break;
+			while (cp > sp && cp[-1] == '\\')
+				cp--;
+			if ((end - cp) % 2)
+				break;
+			*end = '\0';
+			return 1;
+		default:
+			break;
+		}
 		mandoc_msg(MANDOCERR_FI_BLANK, mdoc->parse,
 		    line, (int)(c - buf), NULL);
-
-		/*
-		 * Insert a `sp' in the case of a blank line.  Technically,
-		 * blank lines aren't allowed, but enough manuals assume this
-		 * behaviour that we want to work around it.
-		 */
 		roff_elem_alloc(mdoc, line, offs, ROFF_sp);
 		mdoc->last->flags |= NODE_VALID | NODE_ENDED;
 		mdoc->next = ROFF_NEXT_SIBLING;
@@ -281,8 +291,8 @@ mdoc_ptext(struct roff_man *mdoc, int line, char *buf,
 		if (end - c < 3)
 			break;
 		if (c[1] != ' ' ||
-		    isalpha((unsigned char)c[-2]) == 0 ||
-		    isalpha((unsigned char)c[-1]) == 0 ||
+		    isalnum((unsigned char)c[-2]) == 0 ||
+		    isalnum((unsigned char)c[-1]) == 0 ||
 		    (c[-2] == 'n' && c[-1] == 'c') ||
 		    (c[-2] == 'v' && c[-1] == 's'))
 			continue;
@@ -362,7 +372,7 @@ mdoc_pmacro(struct roff_man *mdoc, int ln, char *buf, 
 
 	n = mdoc->last;
 	if (n == NULL || tok == MDOC_It || tok == MDOC_El) {
-		mdoc_macro(mdoc, tok, ln, sv, &offs, buf);
+		(*mdoc_macro(tok)->fp)(mdoc, tok, ln, sv, &offs, buf);
 		return 1;
 	}
 
@@ -378,13 +388,13 @@ mdoc_pmacro(struct roff_man *mdoc, int ln, char *buf, 
 	    (n->parent != NULL && n->parent->tok == MDOC_Bl &&
 	     n->parent->norm->Bl.type == LIST_column)) {
 		mdoc->flags |= MDOC_FREECOL;
-		mdoc_macro(mdoc, MDOC_It, ln, sv, &sv, buf);
+		(*mdoc_macro(MDOC_It)->fp)(mdoc, MDOC_It, ln, sv, &sv, buf);
 		return 1;
 	}
 
 	/* Normal processing of a macro. */
 
-	mdoc_macro(mdoc, tok, ln, sv, &offs, buf);
+	(*mdoc_macro(tok)->fp)(mdoc, tok, ln, sv, &offs, buf);
 
 	/* In quick mode (for mandocdb), abort after the NAME section. */