infinite recursion regression fix

[Ingo Schwarze <schwarze@usta.de>]

Hi,

one of the recent releases introduced a regression with respect
to infinite recursion:  When string expansion exceeds the recursion
limit, groff drops the input line, and mandoc used to do the same.
Current mandoc, however, just leaves the string unexpanded.

The following patch restores compatible behaviour.

OK?
  Ingo


Index: roff.c
===================================================================
RCS file: /cvs/src/usr.bin/mandoc/roff.c,v
retrieving revision 1.44
diff -u -p -r1.44 roff.c
--- roff.c	19 Sep 2011 07:53:54 -0000	1.44
+++ roff.c	22 Oct 2011 21:20:23 -0000
@@ -182,7 +182,7 @@ static	void		 roff_openeqn(struct roff *
 				int, int, const char *);
 static	enum rofft	 roff_parse(struct roff *, const char *, int *);
 static	enum rofferr	 roff_parsetext(char *);
-static	void		 roff_res(struct roff *, 
+static	enum rofferr	 roff_res(struct roff *, 
 				char **, size_t *, int, int);
 static	enum rofferr	 roff_rm(ROFF_ARGS);
 static	void		 roff_setstr(struct roff *,
@@ -428,7 +428,7 @@ roff_alloc(struct mparse *parse)
  * is processed. 
  * This also checks the syntax of regular escapes.
  */
-static void
+static enum rofferr
 roff_res(struct roff *r, char **bufp, size_t *szp, int ln, int pos)
 {
 	enum mandoc_esc	 esc;
@@ -454,7 +454,7 @@ again:
 		 */
 
 		if ('\0' == *cp)
-			return;
+			return(ROFF_CONT);
 
 		if ('*' != *cp) {
 			res = cp;
@@ -465,7 +465,7 @@ again:
 			mandoc_msg
 				(MANDOCERR_BADESCAPE, r->parse, 
 				 ln, (int)(stesc - *bufp), NULL);
-			return;
+			return(ROFF_CONT);
 		}
 
 		cp++;
@@ -478,7 +478,7 @@ again:
 
 		switch (*cp) {
 		case ('\0'):
-			return;
+			return(ROFF_CONT);
 		case ('('):
 			cp++;
 			maxl = 2;
@@ -501,7 +501,7 @@ again:
 					(MANDOCERR_BADESCAPE, 
 					 r->parse, ln, 
 					 (int)(stesc - *bufp), NULL);
-				return;
+				return(ROFF_CONT);
 			}
 			if (0 == maxl && ']' == *cp)
 				break;
@@ -542,8 +542,9 @@ again:
 
 		/* Just leave the string unexpanded. */
 		mandoc_msg(MANDOCERR_ROFFLOOP, r->parse, ln, pos, NULL);
-		return;
+		return(ROFF_IGN);
 	}
+	return(ROFF_CONT);
 }
 
 /*
@@ -600,7 +601,10 @@ roff_parseln(struct roff *r, int ln, cha
 	 * words to fill in.
 	 */
 
-	roff_res(r, bufp, szp, ln, pos);
+	e = roff_res(r, bufp, szp, ln, pos);
+	if (ROFF_IGN == e)
+		return(e);
+	assert(ROFF_CONT == e);
 
 	ppos = pos;
 	ctl = mandoc_getcontrol(*bufp, &pos);
--
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