WIP CLI

1 files changed, 67 insertions, 0 deletions

diff --git a/client/examples/puzbus-hello-world.cpp b/client/examples/puzbus-hello-world.cpp
new file mode 100644
index 0000000..dcc965b
--- /dev/null
+++ b/client/examples/puzbus-hello-world.cpp
@@ -0,0 +1,67 @@
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <unistd.h>
+
+#include "puzbusv1.h"
+
+int send_message() {
+	const char* data = "Test message data!";
+	struct pb_msg output = {
+		.addr = 0x39,
+		.data = (char*) data,
+		.length = strlen(data),
+	};
+
+	char* packed;
+	size_t size;
+	if (!pb_write(&output, &packed, &size)) {
+		printf("error writing!\n");
+		return EXIT_FAILURE;
+	}
+
+	fwrite(packed, sizeof(packed[0]), size, stdout);
+	fflush(stdout);
+
+	return EXIT_SUCCESS;
+}
+
+int read_message() {
+	freopen(NULL, "rb", stdin); // allow binary on stdin
+	struct pb_msg input;
+	
+	char buf[4]; // extremely small buffer to test chunked message parsing
+	size_t bytes = 0;
+
+	while ((bytes = fread(buf, sizeof(buf[0]), sizeof(buf), stdin)) > 0) {
+		int ret = pb_read(&input, buf, bytes);
+
+		// header read error
+		if (ret < 0) {
+			printf("error reading!\n");
+			return EXIT_FAILURE;
+		}
+
+		// continue reading if more bytes needed...
+		if (ret > 0) continue;
+
+		// message read completely!
+		printf("address: 0x%02x\n", input.addr);
+		printf("data:    \"%.*s\"\n", input.length, input.data);
+		free(input.data);
+		return EXIT_SUCCESS;
+	}
+
+	// if we reach this point, data was read but it did not contain a complete
+	// message, and is thus considered a failure
+	return EXIT_FAILURE;
+}
+
+int main() {
+	if (!isatty(fileno(stdout))) return send_message();
+	if (!isatty(fileno(stdin))) return read_message();
+	
+	printf("please pipe some data in or out to use this program\n");
+	return EXIT_SUCCESS;
+}
+