Function readFile

samples/LiveDebug/app/application.cpp:145–170

* Demonstrate opening and reading a file from the host. */

 * Demonstrate opening and reading a file from the host.
 */
void readFile(const char* filename, bool display)
{
	int file = gdbfs.open(filename, File::ReadOnly);
	Serial << _F("gdbfs.open(\"") << filename << "\") = " << file << endl;
	if(file >= 0) {
		OneShotFastMs timer;
		char buf[256];
		size_t total{0};
		int len;
		do {
			len = gdbfs.read(file, buf, sizeof(buf));
			if(len > 0) {
				total += size_t(len);
				if(display) {
					Serial.write(buf, len);
				}
			}
		} while(len == sizeof(buf));
		auto elapsed = timer.elapsedTime();
		Serial.println();
		Serial << _F("gdbfs.read() = ") << len << _F(", total = ") << total << _F(", elapsed = ") << elapsed.toString()
			   << _F(", av. ") << (total == 0 ? 0 : 1000U * total / elapsed) << _F(" bytes/sec") << endl;

		gdbfs.close(file);
	}
}

/*
 * A more advanced way to use host File I/O using asynchronous syscalls.