Display mroe helpful message on bogus '-i' arguments.

diff --git a/main.c b/main.c
index bb75b7a49f8fab0bbc1ed2354f6e9597ee9c6e7e..ea26c617be4bd48d78bc745bb0a2567ad73e4d1c 100644 (file)
--- a/main.c
+++ b/main.c
@@ -319,6 +319,9 @@ main(int argc, char *argv[])
                                optarg = argv[argn][2]
                                        ? argv[argn]+2 : argv[++argn];
                                ivecs = find_vec(optarg, &ivec_opts);
+                               if (ivecs == NULL) {
+                                       fatal ("Input type '%s' not recognized\n", optarg);
+                               }
                                break;
                        case 'o':
                                if (ivecs == NULL) {