+struct port_data {
+#ifdef _WIN32
+ DCB dcb;
+#else
+ struct termios term;
+ int controlbits;
+#endif
+};
+
+/* Standard baud rates. */
+#ifdef _WIN32
+#define BAUD_TYPE DWORD
+#define BAUD(n) {CBR_##n, n}
+#else
+#define BAUD_TYPE speed_t
+#define BAUD(n) {B##n, n}
+#endif
+
+struct std_baudrate {
+ BAUD_TYPE index;
+ int value;
+};
+
+const struct std_baudrate std_baudrates[] = {
+#ifdef _WIN32
+ /*
+ * The baudrates 50/75/134/150/200/1800/230400/460800 do not seem to
+ * have documented CBR_* macros.
+ */
+ BAUD(110), BAUD(300), BAUD(600), BAUD(1200), BAUD(2400), BAUD(4800),
+ BAUD(9600), BAUD(14400), BAUD(19200), BAUD(38400), BAUD(57600),
+ BAUD(115200), BAUD(128000), BAUD(256000)
+#else
+ BAUD(50), BAUD(75), BAUD(110), BAUD(134), BAUD(150), BAUD(200), BAUD(300),
+ BAUD(600), BAUD(1200), BAUD(1800), BAUD(2400), BAUD(4800), BAUD(9600),
+ BAUD(19200), BAUD(38400), BAUD(57600), BAUD(115200), BAUD(230400),
+#if !defined(__APPLE__) && !defined(__OpenBSD__)
+ BAUD(460800)
+#endif
+#endif
+};
+
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
+#define NUM_STD_BAUDRATES ARRAY_SIZE(std_baudrates)
+
+/* Helper functions. */
+static enum sp_return validate_port(struct sp_port *port);
+static struct sp_port **list_append(struct sp_port **list, const char *portname);
+static enum sp_return get_config(struct sp_port *port, struct port_data *data,
+ struct sp_port_config *config);
+static enum sp_return set_config(struct sp_port *port, struct port_data *data,
+ const struct sp_port_config *config);
+
+enum sp_return sp_get_port_by_name(const char *portname, struct sp_port **port_ptr)
+{
+ struct sp_port *port;
+ int len;
+
+ if (!port_ptr)
+ return SP_ERR_ARG;
+
+ *port_ptr = NULL;
+
+ if (!portname)
+ return SP_ERR_ARG;
+
+ if (!(port = malloc(sizeof(struct sp_port))))
+ return SP_ERR_MEM;
+
+ len = strlen(portname) + 1;
+
+ if (!(port->name = malloc(len)))
+ {
+ free(port);
+ return SP_ERR_MEM;
+ }
+
+ memcpy(port->name, portname, len);
+
+#ifdef _WIN32
+ port->hdl = INVALID_HANDLE_VALUE;
+#else
+ port->fd = -1;
+#endif
+
+ *port_ptr = port;
+
+ return SP_OK;
+}
+
+enum sp_return sp_copy_port(const struct sp_port *port, struct sp_port **copy_ptr)
+{
+ if (!copy_ptr)
+ return SP_ERR_ARG;
+
+ *copy_ptr = NULL;
+
+ if (!port || !port->name)
+ return SP_ERR_ARG;
+
+ return sp_get_port_by_name(port->name, copy_ptr);
+}
+
+void sp_free_port(struct sp_port *port)
+{
+ if (!port)
+ return;
+
+ if (port->name)
+ free(port->name);
+
+ free(port);
+}
+
+static struct sp_port **list_append(struct sp_port **list, const char *portname)