1 files changed, 23 insertions, 0 deletions
diff --git a/lib/mlibc/tests/ansi/snprintf.c b/lib/mlibc/tests/ansi/snprintf.c
new file mode 100644
index 0000000..82e4640
--- /dev/null
+++ b/lib/mlibc/tests/ansi/snprintf.c
@@ -0,0 +1,23 @@
+#include <stdio.h>
+#include <assert.h>
+#include <string.h>
+
+int main() {
+	char buffer[10];
+	int ret = snprintf(buffer, 10, "%d", 123456789);
+	assert(strncmp("123456789", buffer, 10) == 0);
+	assert(ret == 9);
+
+	// We deliberately induce a warning here.
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wformat-truncation"
+	ret = snprintf(buffer, 10, "%d", 1234567890);
+	assert(strncmp("123456789", buffer, 10) == 0);
+	assert(ret == 10);
+#pragma GCC diagnostic pop
+
+	// mlibc issue #118.
+	ret = snprintf(NULL, 0, "%d", 123456789);
+	assert(ret == 9);
+	return 0;
+}