1 files changed, 69 insertions, 0 deletions
diff --git a/lib/mlibc/tests/posix/fopencookie.c b/lib/mlibc/tests/posix/fopencookie.c
new file mode 100644
index 0000000..4325038
--- /dev/null
+++ b/lib/mlibc/tests/posix/fopencookie.c
@@ -0,0 +1,69 @@
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
+#include <assert.h>
+#include <stdbool.h>
+#include <stdio.h>
+
+struct testcookie {
+	bool read;
+	bool write;
+	bool seek;
+	bool close;
+};
+
+ssize_t cookie_read(void *c, char *buf, size_t size) {
+	(void) buf;
+	struct testcookie *cookie = c;
+	cookie->read = true;
+	return size;
+}
+
+ssize_t cookie_write(void *c, const char *buf, size_t size) {
+	(void) buf;
+	struct testcookie *cookie = c;
+	cookie->write = true;
+	return size;
+}
+
+int cookie_seek(void *c, off64_t *offset, int whence) {
+	(void) offset;
+	(void) whence;
+	struct testcookie *cookie = c;
+	cookie->seek = true;
+	return 0;
+}
+
+int cookie_close(void *c) {
+	struct testcookie *cookie = c;
+	cookie->close = true;
+	return 0;
+}
+
+int main() {
+	struct testcookie cookie = { false, false, false, false };
+
+	cookie_io_functions_t funcs = {
+		.read = cookie_read,
+		.write = cookie_write,
+		.seek = cookie_seek,
+		.close = cookie_close,
+	};
+
+	FILE *stream = fopencookie(&cookie, "w+", funcs);
+	assert(stream);
+
+	unsigned char buf[1];
+	int ret = fread(buf, 1, 1, stream);
+	assert(ret == 1);
+	ret = fwrite(buf, 1, 1, stream);
+	assert(ret == 1);
+	ret = fseek(stream, 0, SEEK_SET);
+	assert(!ret);
+
+	ret = fclose(stream);
+	assert(!ret);
+
+	assert(cookie.read && cookie.write && cookie.seek && cookie.close);
+}