build: added interface checking and nicer snprintf checking

use CHECK_CODE()

1 files changed, 29 insertions, 0 deletions

diff --git a/lib/replace/test/snprintf.c b/lib/replace/test/snprintf.c
new file mode 100644
index 0000000000..d06630bcc9
--- /dev/null
+++ b/lib/replace/test/snprintf.c
@@ -0,0 +1,29 @@
+void foo(const char *format, ...)
+{
+	va_list ap;
+	int len;
+	char buf[20];
+	long long l = 1234567890;
+	l *= 100;
+
+	va_start(ap, format);
+	len = vsnprintf(buf, 0, format, ap);
+	va_end(ap);
+	if (len != 5) exit(1);
+
+	va_start(ap, format);
+	len = vsnprintf(0, 0, format, ap);
+	va_end(ap);
+	if (len != 5) exit(2);
+
+	if (snprintf(buf, 3, "hello") != 5 || strcmp(buf, "he") != 0) exit(3);
+
+	if (snprintf(buf, 20, "%lld", l) != 12 || strcmp(buf, "123456789000") != 0) exit(4);
+	if (snprintf(buf, 20, "%zu", 123456789) != 9 || strcmp(buf, "123456789") != 0) exit(5);
+	if (snprintf(buf, 20, "%2\$d %1\$d", 3, 4) != 3 || strcmp(buf, "4 3") != 0) exit(6);
+	if (snprintf(buf, 20, "%s", 0) < 3) exit(7);
+
+	printf("1");
+	exit(0);
+}
+main() { foo("hello"); }