1 files changed, 35 insertions, 0 deletions
diff --git a/src/user/app/tests/shared/printf.c b/src/user/app/tests/shared/printf.c
new file mode 100644
index 0000000..04175db
--- /dev/null
+++ b/src/user/app/tests/shared/printf.c
@@ -0,0 +1,35 @@
+#include "../tests.h"
+#include <stdio.h>
+#include <string.h>
+
+static void test_printf(void) {
+	char buf[64];
+	memset(buf, '?', 64);
+
+	/* test proper overflow handling in snprintf */
+	test(13 == snprintf(buf, 15, "That's 0x%x", 0x1337));
+	test(!memcmp(buf, "That's 0x1337\0??", 16));
+	test(17 == snprintf(buf, 15, "%05x %05x %05x", 0, 0, 0));
+	test(!memcmp(buf, "00000 00000 00\0?", 16));
+
+	/* all the other stuff */
+	snprintf(buf, sizeof buf, "%010x", 0x1BABE);
+	test(!strcmp(buf, "000001babe"));
+	snprintf(buf, sizeof buf, "%10x", 0x1BABE);
+	test(!strcmp(buf, "     1babe"));
+	snprintf(buf, sizeof buf, "%10s", "hello");
+	test(!strcmp(buf, "     hello"));
+
+	snprintf(buf, sizeof buf, "%s%%%s", "ab", "cd");
+	test(!strcmp(buf, "ab%cd"));
+
+	snprintf(buf, sizeof buf, "%05u %05u", 1234, 56789);
+	test(!strcmp(buf, "01234 56789"));
+
+	snprintf(buf, sizeof buf, "%u %x", 0, 0);
+	test(!strcmp(buf, "0 0"));
+}
+
+void r_s_printf(void) {
+	run_test(test_printf);
+}