mdocml: Instead of silently doing nothing at all, warn and return

[schwarze@mdocml.bsd.lv]

Log Message:
-----------
Instead of silently doing nothing at all,
warn and return non-zero when the manpath is empty, that is,
when /etc/man.conf is non-existent or unreadable
AND the environment variable MANPATH is unset or empty
AND no directories were given on the command line.

Inspired by the error handling in espie@'s makewhatis(8),
except that one doesn't know about MANPATH.

Modified Files:
--------------
    mdocml:
        mandocdb.c

Revision Data
-------------
Index: mandocdb.c
===================================================================
RCS file: /usr/vhosts/mdocml.bsd.lv/cvs/mdocml/mandocdb.c,v
retrieving revision 1.126
retrieving revision 1.127
diff -Lmandocdb.c -Lmandocdb.c -u -p -r1.126 -r1.127
--- mandocdb.c
+++ mandocdb.c
@@ -462,6 +462,11 @@ main(int argc, char *argv[])
 		} else
 			manpath_parse(&dirs, path_arg, NULL, NULL);
 
+		if (0 == dirs.sz) {
+			exitcode = (int)MANDOCLEVEL_BADARG;
+			say("", "Empty manpath");
+		}
+
 		/*
 		 * First scan the tree rooted at a base directory, then
 		 * build a new database and finally move it into place.
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