Prefix error messages from mandoc(1) with "mandoc: "

just like almost all other utility programs do.
Suggested by nick@ who wondered where messages came from
when calling mandoc(1) from inside a Perl script.
ok jmc@ nick@

1 files changed, 2 insertions, 1 deletions

diff --git a/main.c b/main.c
index 64100318..00cdfb76 100644
--- a/main.c
+++ b/main.c
@@ -408,7 +408,8 @@ mmsg(enum mandocerr t, enum mandoclevel lvl,
 		const char *file, int line, int col, const char *msg)
 {
 
-	fprintf(stderr, "%s:%d:%d: %s: %s", file, line, col + 1,
+	fprintf(stderr, "%s: %s:%d:%d: %s: %s", progname,
+	    file, line, col + 1,
 	    mparse_strlevel(lvl), mparse_strerror(t));
 
 	if (msg)