diff options
| -rw-r--r-- | main.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/main.c b/main.c index abef591..a52551e 100644 --- a/main.c +++ b/main.c @@ -126,8 +126,13 @@ main(int ac, char *av[]) } break; case 'o': - if (strcmp(optarg, "-") != 0) + if (strcmp(optarg, "-") != 0) { outf = fopen(optarg, "w"); + if (!outf) { + fprintf(stderr, "cannot open '%s'\n", optarg); + exit(1); + } + } break; case 't': for (tm=tmap;; tm++) { |