From d447db580f83836c66e1273a0c4ccbf7bbc939eb Mon Sep 17 00:00:00 2001
From: Ingo Schwarze <schwarze@openbsd.org>
Date: Wed, 19 Nov 2014 03:08:17 +0000
Subject: Escape sequences terminate high-level macro names, and when doing so,
 they are ignored, just in the same way as for request names and for low-level
 macro names. This also cures a warning in the pod2man(1) preamble.

---
 man.c  | 29 ++++++++++++++++++++++-------
 mdoc.c | 26 ++++++++++++++++++--------
 2 files changed, 40 insertions(+), 15 deletions(-)

diff --git a/man.c b/man.c
index dedf62e7..55f9522f 100644
--- a/man.c
+++ b/man.c
@@ -1,4 +1,4 @@
-/*	$Id: man.c,v 1.142 2014/11/03 23:18:39 schwarze Exp $ */
+/*	$Id: man.c,v 1.143 2014/11/19 03:08:17 schwarze Exp $ */
 /*
  * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2013, 2014 Ingo Schwarze <schwarze@openbsd.org>
@@ -483,35 +483,50 @@ man_ptext(struct man *man, int line, char *buf, int offs)
 static int
 man_pmacro(struct man *man, int ln, char *buf, int offs)
 {
-	char		 mac[5];
 	struct man_node	*n;
+	const char	*cp;
 	enum mant	 tok;
 	int		 i, ppos;
 	int		 bline;
+	char		 mac[5];
 
 	ppos = offs;
 
 	/*
 	 * Copy the first word into a nil-terminated buffer.
-	 * Stop copying when a tab, space, or eoln is encountered.
+	 * Stop when a space, tab, escape, or eoln is encountered.
 	 */
 
 	i = 0;
-	while (i < 4 && '\0' != buf[offs] && ' ' != buf[offs] &&
-	    '\t' != buf[offs])
+	while (i < 4 && strchr(" \t\\", buf[offs]) == NULL)
 		mac[i++] = buf[offs++];
 
 	mac[i] = '\0';
 
 	tok = (i > 0 && i < 4) ? man_hash_find(mac) : MAN_MAX;
 
-	if (MAN_MAX == tok) {
+	if (tok == MAN_MAX) {
 		mandoc_msg(MANDOCERR_MACRO, man->parse,
 		    ln, ppos, buf + ppos - 1);
 		return(1);
 	}
 
-	/* The macro is sane.  Jump to the next word. */
+	/* Skip a leading escape sequence or tab. */
+
+	switch (buf[offs]) {
+	case '\\':
+		cp = buf + offs + 1;
+		mandoc_escape(&cp, NULL, NULL);
+		offs = cp - buf;
+		break;
+	case '\t':
+		offs++;
+		break;
+	default:
+		break;
+	}
+
+	/* Jump to the next non-whitespace word. */
 
 	while (buf[offs] && ' ' == buf[offs])
 		offs++;
diff --git a/mdoc.c b/mdoc.c
index baa98c89..d91fe64f 100644
--- a/mdoc.c
+++ b/mdoc.c
@@ -1,4 +1,4 @@
-/*	$Id: mdoc.c,v 1.228 2014/10/20 15:50:24 schwarze Exp $ */
+/*	$Id: mdoc.c,v 1.229 2014/11/19 03:08:17 schwarze Exp $ */
 /*
  * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2010, 2012, 2013, 2014 Ingo Schwarze <schwarze@openbsd.org>
@@ -734,37 +734,47 @@ mdoc_ptext(struct mdoc *mdoc, int line, char *buf, int offs)
 static int
 mdoc_pmacro(struct mdoc *mdoc, int ln, char *buf, int offs)
 {
+	struct mdoc_node *n;
+	const char	 *cp;
 	enum mdoct	  tok;
 	int		  i, sv;
 	char		  mac[5];
-	struct mdoc_node *n;
 
 	sv = offs;
 
 	/*
 	 * Copy the first word into a nil-terminated buffer.
-	 * Stop copying when a tab, space, or eoln is encountered.
+	 * Stop when a space, tab, escape, or eoln is encountered.
 	 */
 
 	i = 0;
-	while (i < 4 && '\0' != buf[offs] && ' ' != buf[offs] &&
-	    '\t' != buf[offs])
+	while (i < 4 && strchr(" \t\\", buf[offs]) == NULL)
 		mac[i++] = buf[offs++];
 
 	mac[i] = '\0';
 
 	tok = (i > 1 && i < 4) ? mdoc_hash_find(mac) : MDOC_MAX;
 
-	if (MDOC_MAX == tok) {
+	if (tok == MDOC_MAX) {
 		mandoc_msg(MANDOCERR_MACRO, mdoc->parse,
 		    ln, sv, buf + sv - 1);
 		return(1);
 	}
 
-	/* Disregard the first trailing tab, if applicable. */
+	/* Skip a leading escape sequence or tab. */
 
-	if ('\t' == buf[offs])
+	switch (buf[offs]) {
+	case '\\':
+		cp = buf + offs + 1;
+		mandoc_escape(&cp, NULL, NULL);
+		offs = cp - buf;
+		break;
+	case '\t':
 		offs++;
+		break;
+	default:
+		break;
+	}
 
 	/* Jump to the next non-whitespace word. */
 
-- 
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