When the content of a manual page does not specify a section, the

empty string got added to the list of sections, breaking the database
format slightly and causing the page to not be considered part of
any section, not even if a section could be deduced from the directory
or from the file name.
Bug found due to the bogus pcredemo(3) "manual" in the pcre-8.38p0 package.

4 files changed, 12 insertions, 16 deletions

diff --git a/usr.bin/mandoc/dba.c b/usr.bin/mandoc/dba.c
index f48aab94b5c..019aa87fe0c 100644
--- a/usr.bin/mandoc/dba.c
+++ b/usr.bin/mandoc/dba.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: dba.c,v 1.4 2016/08/17 18:58:31 schwarze Exp $ */
+/*	$OpenBSD: dba.c,v 1.5 2016/08/17 20:46:06 schwarze Exp $ */
 /*
  * Copyright (c) 2016 Ingo Schwarze <schwarze@openbsd.org>
  *
@@ -128,18 +128,15 @@ dba_write(const char *fname, struct dba *dba)
  * Create a new page and append it to the pages table.
  */
 struct dba_array *
-dba_page_new(struct dba_array *pages, const char *name, const char *sect,
-    const char *arch, const char *desc, const char *file, enum form form)
+dba_page_new(struct dba_array *pages, const char *arch,
+    const char *desc, const char *file, enum form form)
 {
 	struct dba_array *page, *entry;
 
 	page = dba_array_new(DBP_MAX, 0);
 	entry = dba_array_new(1, DBA_STR | DBA_GROW);
-	if (name != NULL)
-		dba_array_add(entry, prepend(name, NAME_FILE & NAME_MASK));
 	dba_array_add(page, entry);
 	entry = dba_array_new(1, DBA_STR | DBA_GROW);
-	dba_array_add(entry, (void *)sect);
 	dba_array_add(page, entry);
 	if (arch != NULL && *arch != '\0') {
 		entry = dba_array_new(1, DBA_STR | DBA_GROW);
diff --git a/usr.bin/mandoc/dba.h b/usr.bin/mandoc/dba.h
index fa613f146bd..77879586b16 100644
--- a/usr.bin/mandoc/dba.h
+++ b/usr.bin/mandoc/dba.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: dba.h,v 1.1 2016/08/01 10:32:39 schwarze Exp $ */
+/*	$OpenBSD: dba.h,v 1.2 2016/08/17 20:46:06 schwarze Exp $ */
 /*
  * Copyright (c) 2016 Ingo Schwarze <schwarze@openbsd.org>
  *
@@ -40,8 +40,7 @@ struct dba	*dba_read(const char *);
 int		 dba_write(const char *, struct dba *);
 
 struct dba_array *dba_page_new(struct dba_array *, const char *,
-			const char *, const char *, const char *,
-			const char *, enum form);
+			const char *, const char *, enum form);
 void		 dba_page_add(struct dba_array *, int32_t, const char *);
 void		 dba_page_alias(struct dba_array *, const char *, uint64_t);
 
diff --git a/usr.bin/mandoc/dba_read.c b/usr.bin/mandoc/dba_read.c
index cd4db383112..3ab4a397aa8 100644
--- a/usr.bin/mandoc/dba_read.c
+++ b/usr.bin/mandoc/dba_read.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: dba_read.c,v 1.3 2016/08/17 18:58:31 schwarze Exp $ */
+/*	$OpenBSD: dba_read.c,v 1.4 2016/08/17 20:46:06 schwarze Exp $ */
 /*
  * Copyright (c) 2016 Ingo Schwarze <schwarze@openbsd.org>
  *
@@ -48,12 +48,11 @@ dba_read(const char *fname)
 	dba = dba_new(npages < 128 ? 128 : npages);
 	for (ip = 0; ip < npages; ip++) {
 		pdata = dbm_page_get(ip);
-		page = dba_page_new(dba->pages, NULL, pdata->sect,
-		    pdata->arch, pdata->desc, pdata->file + 1, *pdata->file);
+		page = dba_page_new(dba->pages, pdata->arch,
+		    pdata->desc, pdata->file + 1, *pdata->file);
 		for (cp = pdata->name; *cp != '\0'; cp = strchr(cp, '\0') + 1)
 			dba_page_add(page, DBP_NAME, cp);
-		cp = pdata->sect;
-		while (*(cp = strchr(cp, '\0') + 1) != '\0')
+		for (cp = pdata->sect; *cp != '\0'; cp = strchr(cp, '\0') + 1)
 			dba_page_add(page, DBP_SECT, cp);
 		if ((cp = pdata->arch) != NULL)
 			while (*(cp = strchr(cp, '\0') + 1) != '\0')
diff --git a/usr.bin/mandoc/mandocdb.c b/usr.bin/mandoc/mandocdb.c
index 1d7565b011c..1e8274b3ed5 100644
--- a/usr.bin/mandoc/mandocdb.c
+++ b/usr.bin/mandoc/mandocdb.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: mandocdb.c,v 1.175 2016/08/05 17:20:30 schwarze Exp $ */
+/*	$OpenBSD: mandocdb.c,v 1.176 2016/08/17 20:46:06 schwarze Exp $ */
 /*
  * Copyright (c) 2011, 2012 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2011-2016 Ingo Schwarze <schwarze@openbsd.org>
@@ -1982,11 +1982,12 @@ dbadd(struct dba *dba, struct mpage *mpage)
 	cp = mpage->desc;
 	i = strlen(cp);
 	mustfree = render_string(&cp, &i);
-	mpage->dba = dba_page_new(dba->pages, mlink->name, mpage->sec,
+	mpage->dba = dba_page_new(dba->pages,
 	    *mpage->arch == '\0' ? mlink->arch : mpage->arch,
 	    cp, mlink->file, mpage->form);
 	if (mustfree)
 		free(cp);
+	dba_page_add(mpage->dba, DBP_SECT, mpage->sec);
 
 	while (mlink != NULL) {
 		dbadd_mlink(mlink);