Don't accept an empty string as selector value

"looks good" edd@

diff --git a/usr.bin/sndioctl/sndioctl.c b/usr.bin/sndioctl/sndioctl.c
index aa174e7..ffe0654 100644 (file)
--- a/usr.bin/sndioctl/sndioctl.c
+++ b/usr.bin/sndioctl/sndioctl.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: sndioctl.c,v 1.16 2021/03/03 09:40:43 ratchov Exp $   */
+/*     $OpenBSD: sndioctl.c,v 1.17 2021/12/25 16:25:07 ratchov Exp $   */
 /*
  * Copyright (c) 2014-2020 Alexandre Ratchov <alex@caoua.org>
  *
@@ -706,6 +706,11 @@ cmd(char *line)
                }
                break;
        case SIOCTL_SEL:
+               if (*pos == '\0') {
+                       fprintf(stderr, "%s.%s: expects value\n", astr, func);
+                       exit(1);
+               }
+               /* FALLTROUGH */
        case SIOCTL_VEC:
        case SIOCTL_LIST:
                for (i = g; i != NULL; i = nextpar(i)) {