Trivial usage help

diff --git a/cyac/cmd/print-items/print-items.c b/cyac/cmd/print-items/print-items.c
index 35190918be6a28cf25c09777dc7a0201cfaf717e2e9f8f928f6a4085642905df..b314cb34f1ac73a51c9ef1a8a5d715a32dacfb56790eaedc12fa91eee47af65b 100644 (file)
--- a/cyac/cmd/print-items/print-items.c
+++ b/cyac/cmd/print-items/print-items.c
@@ -254,6 +254,10 @@ printer(
 int
 main(int argc, char **argv)
 {
+    if (argc < 2) {
+        fprintf(stderr, "Usage: %s FILE\n", argv[0]);
+        return EXIT_FAILURE;
+    }
     size_t len = 0;
     unsigned char *buf = NULL;
     if (!Mmap(&buf, &len, argv[1])) {

diff --git a/cyac/cmd/print-itered/print-itered.c b/cyac/cmd/print-itered/print-itered.c
index ed2758b8e63724133c63596b3e7765e096b9d977351ad6f81292c3f074e28985..c9923e7304c554c36ef310b0cd5058aa95460bd6cd902eb2f0d6a1ac770c63ed 100644 (file)
--- a/cyac/cmd/print-itered/print-itered.c
+++ b/cyac/cmd/print-itered/print-itered.c
@@ -156,6 +156,10 @@ myCb(
 int
 main(int argc, char **argv)
 {
+    if (argc < 2) {
+        fprintf(stderr, "Usage: %s FILE\n", argv[0]);
+        return EXIT_FAILURE;
+    }
     size_t len = 0;
     unsigned char *buf = NULL;
     if (!Mmap(&buf, &len, argv[1])) {