From ba82ef8274e10aa65d433d7873b037a0860d8038 Mon Sep 17 00:00:00 2001
From: Eric Fischer <enf@pobox.com>
Date: Tue, 18 Jul 2017 14:11:48 -0700
Subject: [PATCH] Complain if the output file or directory is specified more
 than once

---
 main.cpp | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/main.cpp b/main.cpp
index 1f55959..f24f7f6 100644
--- a/main.cpp
+++ b/main.cpp
@@ -2293,10 +2293,26 @@ int main(int argc, char **argv) {
 			break;
 
 		case 'o':
+			if (out_mbtiles != NULL) {
+				fprintf(stderr, "%s: Can't specify both %s and %s as output\n", argv[0], out_mbtiles, optarg);
+				exit(EXIT_FAILURE);
+			}
+			if (out_directory != NULL) {
+				fprintf(stderr, "%s: Can't specify both %s and %s as output\n", argv[0], out_directory, optarg);
+				exit(EXIT_FAILURE);
+			}
 			out_mbtiles = optarg;
 			break;
 
 		case 'e':
+			if (out_mbtiles != NULL) {
+				fprintf(stderr, "%s: Can't specify both %s and %s as output\n", argv[0], out_mbtiles, optarg);
+				exit(EXIT_FAILURE);
+			}
+			if (out_directory != NULL) {
+				fprintf(stderr, "%s: Can't specify both %s and %s as output\n", argv[0], out_directory, optarg);
+				exit(EXIT_FAILURE);
+			}
 			out_directory = optarg;
 			break;