+#ifdef __APPLE__
+#include <IOKit/IOKitLib.h>
+#include <IOKit/serial/IOSerialKeys.h>
+#include <IOKit/serial/ioss.h>
+#include <sys/syslimits.h>
+#endif
+#ifdef __linux__
+#include "libudev.h"
+#include "linux/serial.h"
+#include "linux_termios.h"
+#if defined(TCGETX) && defined(TCSETX) && defined(HAVE_TERMIOX)
+#define USE_TERMIOX
+#endif
+#endif
+
+#ifndef _WIN32
+#include "linux_termios.h"
+#endif
+
+#include "libserialport.h"
+
+struct sp_port {
+ char *name;
+ int nonblocking;
+#ifdef _WIN32
+ HANDLE hdl;
+ OVERLAPPED write_ovl;
+ BYTE pending_byte;
+ BOOL writing;
+#else
+ int fd;
+#endif
+};
+
+struct sp_port_config {
+ int baudrate;
+ int bits;
+ enum sp_parity parity;
+ int stopbits;
+ enum sp_rts rts;
+ enum sp_cts cts;
+ enum sp_dtr dtr;
+ enum sp_dsr dsr;
+ enum sp_xonxoff xon_xoff;
+};
+
+struct port_data {
+#ifdef _WIN32
+ DCB dcb;
+#else
+ struct termios term;
+ int controlbits;
+ int termiox_supported;
+ int flow;
+#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
+};
+
+void (*sp_debug_handler)(const char *format, ...) = sp_default_debug_handler;
+
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
+#define NUM_STD_BAUDRATES ARRAY_SIZE(std_baudrates)
+
+/* Debug output macros. */
+#define DEBUG(fmt, ...) do { if (sp_debug_handler) sp_debug_handler(fmt ".\n", ##__VA_ARGS__); } while (0)
+#define DEBUG_ERROR(err, msg) DEBUG("%s returning " #err ": " msg, __func__)
+#define DEBUG_FAIL(msg) do { \
+ char *errmsg = sp_last_error_message(); \
+ DEBUG("%s returning SP_ERR_FAIL: " msg ": %s", __func__, errmsg); \
+ sp_free_error_message(errmsg); \
+} while (0);
+#define RETURN() do { DEBUG("%s returning", __func__); return; } while(0)
+#define RETURN_CODE(x) do { DEBUG("%s returning " #x, __func__); return x; } while (0)
+#define RETURN_CODEVAL(x) do { \
+ switch (x) { \
+ case SP_OK: RETURN_CODE(SP_OK); \
+ case SP_ERR_ARG: RETURN_CODE(SP_ERR_ARG); \
+ case SP_ERR_FAIL: RETURN_CODE(SP_ERR_FAIL); \
+ case SP_ERR_MEM: RETURN_CODE(SP_ERR_MEM); \
+ case SP_ERR_SUPP: RETURN_CODE(SP_ERR_SUPP); \
+ } \
+} while (0)
+#define RETURN_OK() RETURN_CODE(SP_OK);
+#define RETURN_ERROR(err, msg) do { DEBUG_ERROR(err, msg); return err; } while (0)
+#define RETURN_FAIL(msg) do { DEBUG_FAIL(msg); return SP_ERR_FAIL; } while (0)
+#define RETURN_VALUE(fmt, x) do { DEBUG("%s returning " fmt, __func__, x); return x; } while (0)
+#define SET_ERROR(val, err, msg) do { DEBUG_ERROR(err, msg); val = err; } while (0)
+#define SET_FAIL(val, msg) do { DEBUG_FAIL(msg); val = SP_ERR_FAIL; } while (0)
+#define TRACE(fmt, ...) DEBUG("%s(" fmt ") called", __func__, ##__VA_ARGS__)
+
+#define TRY(x) do { int ret = x; if (ret != SP_OK) RETURN_CODEVAL(ret); } while (0)
+
+/* Helper functions. */
+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;
+
+ TRACE("%s, %p", portname, port_ptr);
+
+ if (!port_ptr)
+ RETURN_ERROR(SP_ERR_ARG, "Null result pointer");
+
+ *port_ptr = NULL;
+
+ if (!portname)
+ RETURN_ERROR(SP_ERR_ARG, "Null port name");
+
+ DEBUG("Building structure for port %s", portname);
+
+ if (!(port = malloc(sizeof(struct sp_port))))
+ RETURN_ERROR(SP_ERR_MEM, "Port structure malloc failed");
+
+ len = strlen(portname) + 1;
+
+ if (!(port->name = malloc(len))) {
+ free(port);
+ RETURN_ERROR(SP_ERR_MEM, "Port name malloc failed");
+ }
+
+ memcpy(port->name, portname, len);
+
+#ifdef _WIN32
+ port->hdl = INVALID_HANDLE_VALUE;
+#else
+ port->fd = -1;
+#endif
+
+ *port_ptr = port;
+
+ RETURN_OK();
+}
+
+char *sp_get_port_name(const struct sp_port *port)
+{
+ TRACE("%p", port);
+
+ if (!port)
+ return NULL;
+
+ RETURN_VALUE("%s", port->name);
+}
+
+enum sp_return sp_get_port_handle(const struct sp_port *port, void *result_ptr)
+{
+ TRACE("%p", port);
+
+ if (!port)
+ RETURN_ERROR(SP_ERR_ARG, "Null port");
+
+#ifdef _WIN32
+ HANDLE *handle_ptr = result_ptr;
+ *handle_ptr = port->hdl;
+#else
+ int *fd_ptr = result_ptr;
+ *fd_ptr = port->fd;
+#endif
+
+ RETURN_OK();
+}
+
+enum sp_return sp_copy_port(const struct sp_port *port, struct sp_port **copy_ptr)
+{
+ TRACE("%p, %p", port, copy_ptr);
+
+ if (!copy_ptr)
+ RETURN_ERROR(SP_ERR_ARG, "Null result pointer");
+
+ *copy_ptr = NULL;
+
+ if (!port)
+ RETURN_ERROR(SP_ERR_ARG, "Null port");
+
+ if (!port->name)
+ RETURN_ERROR(SP_ERR_ARG, "Null port name");
+
+ DEBUG("Copying port structure");
+
+ RETURN_VALUE("%p", sp_get_port_by_name(port->name, copy_ptr));
+}
+
+void sp_free_port(struct sp_port *port)
+{
+ TRACE("%p", port);
+
+ if (!port)
+ {
+ DEBUG("Null port");
+ RETURN();
+ }
+
+ DEBUG("Freeing port structure");
+
+ if (port->name)
+ free(port->name);
+
+ free(port);
+
+ RETURN();
+}
+
+static struct sp_port **list_append(struct sp_port **list, const char *portname)
+{
+ void *tmp;
+ unsigned int count;
+
+ for (count = 0; list[count]; count++);
+ if (!(tmp = realloc(list, sizeof(struct sp_port *) * (count + 2))))
+ goto fail;
+ list = tmp;
+ if (sp_get_port_by_name(portname, &list[count]) != SP_OK)
+ goto fail;
+ list[count + 1] = NULL;
+ return list;
+
+fail:
+ sp_free_port_list(list);
+ return NULL;
+}
+
+enum sp_return sp_list_ports(struct sp_port ***list_ptr)
+{
+ struct sp_port **list;
+ int ret = SP_ERR_SUPP;
+
+ TRACE("%p", list_ptr);
+
+ if (!list_ptr)
+ RETURN_ERROR(SP_ERR_ARG, "Null result pointer");
+
+ DEBUG("Enumerating ports");
+
+ if (!(list = malloc(sizeof(struct sp_port **))))
+ RETURN_ERROR(SP_ERR_MEM, "Port list malloc failed");
+
+ list[0] = NULL;
+
+#ifdef _WIN32
+ HKEY key;
+ TCHAR *value, *data;
+ DWORD max_value_len, max_data_size, max_data_len;
+ DWORD value_len, data_size, data_len;
+ DWORD type, index = 0;
+ char *name;
+ int name_len;
+
+ ret = SP_OK;
+
+ DEBUG("Opening registry key");
+ if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, _T("HARDWARE\\DEVICEMAP\\SERIALCOMM"),
+ 0, KEY_QUERY_VALUE, &key) != ERROR_SUCCESS) {
+ SET_FAIL(ret, "RegOpenKeyEx() failed");
+ goto out_done;
+ }
+ DEBUG("Querying registry key value and data sizes");
+ if (RegQueryInfoKey(key, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+ &max_value_len, &max_data_size, NULL, NULL) != ERROR_SUCCESS) {
+ SET_FAIL(ret, "RegQueryInfoKey() failed");
+ goto out_close;
+ }
+ max_data_len = max_data_size / sizeof(TCHAR);
+ if (!(value = malloc((max_value_len + 1) * sizeof(TCHAR)))) {
+ SET_ERROR(ret, SP_ERR_MEM, "registry value malloc failed");
+ goto out_close;
+ }
+ if (!(data = malloc((max_data_len + 1) * sizeof(TCHAR)))) {
+ SET_ERROR(ret, SP_ERR_MEM, "registry data malloc failed");
+ goto out_free_value;
+ }
+ DEBUG("Iterating over values");
+ while (
+ value_len = max_value_len + 1,
+ data_size = max_data_size,
+ RegEnumValue(key, index, value, &value_len,
+ NULL, &type, (LPBYTE)data, &data_size) == ERROR_SUCCESS)
+ {
+ data_len = data_size / sizeof(TCHAR);
+ data[data_len] = '\0';
+#ifdef UNICODE
+ name_len = WideCharToMultiByte(CP_ACP, 0, data, -1, NULL, 0, NULL, NULL)
+#else
+ name_len = data_len + 1;
+#endif
+ if (!(name = malloc(name_len))) {
+ SET_ERROR(ret, SP_ERR_MEM, "registry port name malloc failed");
+ goto out;
+ }
+#ifdef UNICODE
+ WideCharToMultiByte(CP_ACP, 0, data, -1, name, name_len, NULL, NULL);
+#else
+ strcpy(name, data);
+#endif
+ if (type == REG_SZ) {
+ DEBUG("Found port %s", name);
+ if (!(list = list_append(list, name))) {
+ SET_ERROR(ret, SP_ERR_MEM, "list append failed");
+ goto out;
+ }
+ }
+ index++;
+ }
+out:
+ free(data);
+out_free_value:
+ free(value);
+out_close:
+ RegCloseKey(key);
+out_done:
+#endif
+#ifdef __APPLE__
+ mach_port_t master;
+ CFMutableDictionaryRef classes;
+ io_iterator_t iter;
+ char *path;
+ io_object_t port;
+ CFTypeRef cf_path;
+ Boolean result;
+
+ ret = SP_OK;
+
+ DEBUG("Getting IOKit master port");
+ if (IOMasterPort(MACH_PORT_NULL, &master) != KERN_SUCCESS) {
+ SET_FAIL(ret, "IOMasterPort() failed");
+ goto out_done;
+ }
+
+ DEBUG("Creating matching dictionary");
+ if (!(classes = IOServiceMatching(kIOSerialBSDServiceValue))) {
+ SET_FAIL(ret, "IOServiceMatching() failed");
+ goto out_done;
+ }
+
+ CFDictionarySetValue(classes,
+ CFSTR(kIOSerialBSDTypeKey), CFSTR(kIOSerialBSDAllTypes));
+
+ DEBUG("Getting matching services");
+ if (IOServiceGetMatchingServices(master, classes, &iter) != KERN_SUCCESS) {
+ SET_FAIL(ret, "IOServiceGetMatchingServices() failed");
+ goto out_done;
+ }
+
+ if (!(path = malloc(PATH_MAX))) {
+ SET_ERROR(ret, SP_ERR_MEM, "device path malloc failed");
+ goto out_release;
+ }
+
+ DEBUG("Iterating over results");
+ while ((port = IOIteratorNext(iter))) {
+ cf_path = IORegistryEntryCreateCFProperty(port,
+ CFSTR(kIOCalloutDeviceKey), kCFAllocatorDefault, 0);
+ if (cf_path) {
+ result = CFStringGetCString(cf_path,
+ path, PATH_MAX, kCFStringEncodingASCII);
+ CFRelease(cf_path);
+ if (result) {
+ DEBUG("Found port %s", path);
+ if (!(list = list_append(list, path))) {
+ SET_ERROR(ret, SP_ERR_MEM, "list append failed");
+ IOObjectRelease(port);
+ goto out;
+ }
+ }
+ }
+ IOObjectRelease(port);
+ }
+out:
+ free(path);
+out_release:
+ IOObjectRelease(iter);
+out_done:
+#endif
+#ifdef __linux__
+ struct udev *ud;
+ struct udev_enumerate *ud_enumerate;
+ struct udev_list_entry *ud_list;
+ struct udev_list_entry *ud_entry;
+ const char *path;
+ struct udev_device *ud_dev, *ud_parent;
+ const char *name;
+ const char *driver;
+ int fd, ioctl_result;
+ struct serial_struct serial_info;
+
+ ret = SP_OK;
+
+ DEBUG("Enumerating tty devices");
+ ud = udev_new();
+ ud_enumerate = udev_enumerate_new(ud);
+ udev_enumerate_add_match_subsystem(ud_enumerate, "tty");
+ udev_enumerate_scan_devices(ud_enumerate);
+ ud_list = udev_enumerate_get_list_entry(ud_enumerate);
+ DEBUG("Iterating over results");
+ udev_list_entry_foreach(ud_entry, ud_list) {
+ path = udev_list_entry_get_name(ud_entry);
+ DEBUG("Found device %s", path);
+ ud_dev = udev_device_new_from_syspath(ud, path);
+ /* If there is no parent device, this is a virtual tty. */
+ ud_parent = udev_device_get_parent(ud_dev);
+ if (ud_parent == NULL) {
+ DEBUG("No parent device, assuming virtual tty");
+ udev_device_unref(ud_dev);
+ continue;
+ }
+ name = udev_device_get_devnode(ud_dev);
+ /* The serial8250 driver has a hardcoded number of ports.
+ * The only way to tell which actually exist on a given system
+ * is to try to open them and make an ioctl call. */
+ driver = udev_device_get_driver(ud_parent);
+ if (driver && !strcmp(driver, "serial8250")) {
+ DEBUG("serial8250 device, attempting to open");
+ if ((fd = open(name, O_RDWR | O_NONBLOCK | O_NOCTTY)) < 0) {
+ DEBUG("open failed, skipping");
+ goto skip;
+ }
+ ioctl_result = ioctl(fd, TIOCGSERIAL, &serial_info);
+ close(fd);
+ if (ioctl_result != 0) {
+ DEBUG("ioctl failed, skipping");
+ goto skip;
+ }
+ if (serial_info.type == PORT_UNKNOWN) {
+ DEBUG("port type is unknown, skipping");
+ goto skip;
+ }
+ }
+ DEBUG("Found port %s", name);
+ list = list_append(list, name);
+skip:
+ udev_device_unref(ud_dev);
+ if (!list) {
+ SET_ERROR(ret, SP_ERR_MEM, "list append failed");
+ goto out;
+ }
+ }
+out:
+ udev_enumerate_unref(ud_enumerate);
+ udev_unref(ud);
+#endif
+
+ switch (ret) {
+ case SP_OK:
+ *list_ptr = list;
+ RETURN_OK();
+ case SP_ERR_SUPP:
+ DEBUG_ERROR(SP_ERR_SUPP, "Enumeration not supported on this platform.");
+ default:
+ if (list)
+ sp_free_port_list(list);
+ *list_ptr = NULL;
+ return ret;
+ }
+}
+
+void sp_free_port_list(struct sp_port **list)
+{
+ unsigned int i;
+
+ TRACE("%p", list);
+
+ if (!list) {
+ DEBUG("Null list");
+ RETURN();
+ }
+
+ DEBUG("Freeing port list");
+
+ for (i = 0; list[i]; i++)
+ sp_free_port(list[i]);
+ free(list);
+
+ RETURN();
+}
+
+#define CHECK_PORT() do { \
+ if (port == NULL) \
+ RETURN_ERROR(SP_ERR_ARG, "Null port"); \
+ if (port->name == NULL) \
+ RETURN_ERROR(SP_ERR_ARG, "Null port name"); \
+} while (0)
+#ifdef _WIN32
+#define CHECK_PORT_HANDLE() do { \
+ if (port->hdl == INVALID_HANDLE_VALUE) \
+ RETURN_ERROR(SP_ERR_ARG, "Invalid port handle"); \
+} while (0)
+#else
+#define CHECK_PORT_HANDLE() do { \
+ if (port->fd < 0) \
+ RETURN_ERROR(SP_ERR_ARG, "Invalid port fd"); \
+} while (0)
+#endif
+#define CHECK_OPEN_PORT() do { \
+ CHECK_PORT(); \
+ CHECK_PORT_HANDLE(); \
+} while (0)
+
+enum sp_return sp_open(struct sp_port *port, enum sp_mode flags)
+{
+ TRACE("%p, %x", port, flags);
+
+ CHECK_PORT();
+
+ if (flags > (SP_MODE_READ | SP_MODE_WRITE | SP_MODE_NONBLOCK))
+ RETURN_ERROR(SP_ERR_ARG, "Invalid flags");
+
+ DEBUG("Opening port %s", port->name);
+
+ port->nonblocking = (flags & SP_MODE_NONBLOCK) ? 1 : 0;
+
+#ifdef _WIN32
+ DWORD desired_access = 0, flags_and_attributes = 0;
+ COMMTIMEOUTS timeouts;
+ char *escaped_port_name;
+
+ /* Prefix port name with '\\.\' to work with ports above COM9. */
+ if (!(escaped_port_name = malloc(strlen(port->name + 5))))
+ RETURN_ERROR(SP_ERR_MEM, "Escaped port name malloc failed");
+ sprintf(escaped_port_name, "\\\\.\\%s", port->name);
+
+ /* Map 'flags' to the OS-specific settings. */
+ flags_and_attributes = FILE_ATTRIBUTE_NORMAL;
+ if (flags & SP_MODE_READ)
+ desired_access |= GENERIC_READ;
+ if (flags & SP_MODE_WRITE)
+ desired_access |= GENERIC_WRITE;
+ if (flags & SP_MODE_NONBLOCK)
+ flags_and_attributes |= FILE_FLAG_OVERLAPPED;
+
+ port->hdl = CreateFile(escaped_port_name, desired_access, 0, 0,
+ OPEN_EXISTING, flags_and_attributes, 0);
+
+ free(escaped_port_name);
+
+ if (port->hdl == INVALID_HANDLE_VALUE)
+ RETURN_FAIL("CreateFile() failed");
+
+ /* All timeouts disabled. */
+ timeouts.ReadIntervalTimeout = 0;
+ timeouts.ReadTotalTimeoutMultiplier = 0;
+ timeouts.ReadTotalTimeoutConstant = 0;
+ timeouts.WriteTotalTimeoutMultiplier = 0;
+ timeouts.WriteTotalTimeoutConstant = 0;
+
+ if (port->nonblocking) {
+ /* Set read timeout such that all reads return immediately. */
+ timeouts.ReadIntervalTimeout = MAXDWORD;
+ /* Prepare OVERLAPPED structure for non-blocking writes. */
+ memset(&port->write_ovl, 0, sizeof(port->write_ovl));
+ if (!(port->write_ovl.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL))) {
+ sp_close(port);
+ RETURN_FAIL("CreateEvent() failed");
+ }
+ port->writing = FALSE;
+ }
+
+ if (SetCommTimeouts(port->hdl, &timeouts) == 0) {
+ sp_close(port);
+ RETURN_FAIL("SetCommTimeouts() failed");
+ }
+#else
+ int flags_local = 0;
+ struct port_data data;
+ struct sp_port_config config;
+ int ret;
+
+ /* Map 'flags' to the OS-specific settings. */
+ if (flags & (SP_MODE_READ | SP_MODE_WRITE))
+ flags_local |= O_RDWR;
+ else if (flags & SP_MODE_READ)
+ flags_local |= O_RDONLY;
+ else if (flags & SP_MODE_WRITE)
+ flags_local |= O_WRONLY;
+ if (flags & SP_MODE_NONBLOCK)
+ flags_local |= O_NONBLOCK;
+
+ if ((port->fd = open(port->name, flags_local)) < 0)
+ RETURN_FAIL("open() failed");
+
+ ret = get_config(port, &data, &config);
+
+ if (ret < 0) {
+ sp_close(port);
+ RETURN_CODEVAL(ret);
+ }
+
+ /* Turn off all serial port cooking. */
+ data.term.c_iflag &= ~(ISTRIP | INLCR | ICRNL);
+ data.term.c_oflag &= ~(ONLCR | OCRNL | ONOCR);
+#if !defined(__FreeBSD__) && !defined(__OpenBSD__) && !defined(__NetBSD__)
+ data.term.c_oflag &= ~OFILL;
+#endif
+ /* Disable canonical mode, and don't echo input characters. */
+ data.term.c_lflag &= ~(ICANON | ECHO);
+
+ /* Ignore modem status lines; enable receiver */
+ data.term.c_cflag |= (CLOCAL | CREAD);
+
+ ret = set_config(port, &data, &config);
+
+ if (ret < 0) {
+ sp_close(port);
+ RETURN_CODEVAL(ret);
+ }
+#endif
+
+ RETURN_OK();
+}
+
+enum sp_return sp_close(struct sp_port *port)
+{
+ TRACE("%p", port);
+
+ CHECK_OPEN_PORT();
+
+ DEBUG("Closing port %s", port->name);
+
+#ifdef _WIN32
+ /* Returns non-zero upon success, 0 upon failure. */
+ if (CloseHandle(port->hdl) == 0)
+ RETURN_FAIL("CloseHandle() failed");
+ port->hdl = INVALID_HANDLE_VALUE;
+ if (port->nonblocking) {
+ /* Close event handle created for overlapped writes. */
+ if (CloseHandle(port->write_ovl.hEvent) == 0)
+ RETURN_FAIL("CloseHandle() failed");
+ }
+#else
+ /* Returns 0 upon success, -1 upon failure. */
+ if (close(port->fd) == -1)
+ RETURN_FAIL("close() failed");
+ port->fd = -1;
+#endif
+
+ RETURN_OK();
+}
+
+enum sp_return sp_flush(struct sp_port *port, enum sp_buffer buffers)
+{
+ TRACE("%p, %x", port, buffers);
+
+ CHECK_OPEN_PORT();
+
+ if (buffers > SP_BUF_BOTH)
+ RETURN_ERROR(SP_ERR_ARG, "Invalid buffer selection");
+
+ const char *buffer_names[] = {"no", "input", "output", "both"};
+
+ DEBUG("Flushing %s buffers on port %s", buffer_names[buffers], port->name);
+
+#ifdef _WIN32
+ DWORD flags = 0;
+ if (buffers & SP_BUF_INPUT)
+ flags |= PURGE_RXCLEAR;
+ if (buffers & SP_BUF_OUTPUT)
+ flags |= PURGE_TXCLEAR;
+
+ /* Returns non-zero upon success, 0 upon failure. */
+ if (PurgeComm(port->hdl, flags) == 0)
+ RETURN_FAIL("PurgeComm() failed");
+#else
+ int flags = 0;
+ if (buffers & SP_BUF_BOTH)
+ flags = TCIOFLUSH;
+ else if (buffers & SP_BUF_INPUT)
+ flags = TCIFLUSH;
+ else if (buffers & SP_BUF_OUTPUT)
+ flags = TCOFLUSH;
+
+ /* Returns 0 upon success, -1 upon failure. */
+ if (tcflush(port->fd, flags) < 0)
+ RETURN_FAIL("tcflush() failed");
+#endif
+ RETURN_OK();
+}
+
+enum sp_return sp_drain(struct sp_port *port)
+{
+ TRACE("%p", port);
+
+ CHECK_OPEN_PORT();
+
+ DEBUG("Draining port %s", port->name);
+
+#ifdef _WIN32
+ /* Returns non-zero upon success, 0 upon failure. */
+ if (FlushFileBuffers(port->hdl) == 0)
+ RETURN_FAIL("FlushFileBuffers() failed");
+#else
+ /* Returns 0 upon success, -1 upon failure. */
+ if (tcdrain(port->fd) < 0)
+ RETURN_FAIL("tcdrain() failed");
+#endif
+
+ RETURN_OK();
+}
+
+enum sp_return sp_write(struct sp_port *port, const void *buf, size_t count)
+{
+ TRACE("%p, %p, %d", port, buf, count);
+
+ CHECK_OPEN_PORT();
+
+ if (!buf)
+ RETURN_ERROR(SP_ERR_ARG, "Null buffer");
+
+ DEBUG("Writing up to %d bytes to port %s", count, port->name);
+
+ if (count == 0)
+ RETURN_VALUE("0", 0);
+
+#ifdef _WIN32
+ DWORD written = 0;
+ BYTE *ptr = (BYTE *) buf;
+
+ if (port->nonblocking) {
+ /* Non-blocking write. */
+
+ /* Check whether previous write is complete. */
+ if (port->writing) {
+ if (HasOverlappedIoCompleted(&port->write_ovl)) {
+ DEBUG("Previous write completed");
+ port->writing = 0;
+ } else {
+ DEBUG("Previous write not complete");
+ /* Can't take a new write until the previous one finishes. */
+ RETURN_VALUE("0", 0);
+ }
+ }
+
+ /* Keep writing data until the OS has to actually start an async IO for it.
+ * At that point we know the buffer is full. */
+ while (written < count)
+ {
+ /* Copy first byte of user buffer. */
+ port->pending_byte = *ptr++;
+
+ /* Start asynchronous write. */
+ if (WriteFile(port->hdl, &port->pending_byte, 1, NULL, &port->write_ovl) == 0) {
+ if (GetLastError() == ERROR_IO_PENDING) {
+ DEBUG("Asynchronous write started");
+ port->writing = 1;
+ RETURN_VALUE("%d", ++written);
+ } else {
+ /* Actual failure of some kind. */
+ RETURN_FAIL("WriteFile() failed");
+ }
+ } else {
+ DEBUG("Single byte written immediately.");
+ written++;
+ }
+ }
+
+ DEBUG("All bytes written immediately.");
+
+ } else {
+ /* Blocking write. */
+ if (WriteFile(port->hdl, buf, count, &written, NULL) == 0) {
+ RETURN_FAIL("WriteFile() failed");
+ }
+ }
+
+ RETURN_VALUE("%d", written);
+#else
+ /* Returns the number of bytes written, or -1 upon failure. */
+ ssize_t written = write(port->fd, buf, count);
+
+ if (written < 0)
+ RETURN_FAIL("write() failed");
+ else
+ RETURN_VALUE("%d", written);
+#endif
+}
+
+enum sp_return sp_read(struct sp_port *port, void *buf, size_t count)
+{
+ TRACE("%p, %p, %d", port, buf, count);
+
+ CHECK_OPEN_PORT();
+
+ if (!buf)
+ RETURN_ERROR(SP_ERR_ARG, "Null buffer");
+
+ DEBUG("Reading up to %d bytes from port %s", count, port->name);
+
+#ifdef _WIN32
+ DWORD bytes_read = 0;
+
+ /* Returns non-zero upon success, 0 upon failure. */
+ if (ReadFile(port->hdl, buf, count, &bytes_read, NULL) == 0)
+ RETURN_FAIL("ReadFile() failed");
+ RETURN_VALUE("%d", bytes_read);
+#else
+ ssize_t bytes_read;
+
+ /* Returns the number of bytes read, or -1 upon failure. */
+ if ((bytes_read = read(port->fd, buf, count)) < 0) {
+ if (port->nonblocking && errno == EAGAIN)
+ /* Port is opened in nonblocking mode and there are no bytes available. */
+ bytes_read = 0;
+ else
+ /* This is an actual failure. */
+ RETURN_FAIL("read() failed");
+ }
+ RETURN_VALUE("%d", bytes_read);
+#endif
+}
+
+#ifdef __linux__
+static enum sp_return get_baudrate(int fd, int *baudrate)
+{
+ void *data;
+
+ TRACE("%d, %p", fd, baudrate);
+
+ DEBUG("Getting baud rate");
+
+ if (!(data = malloc(get_termios_size())))
+ RETURN_ERROR(SP_ERR_MEM, "termios malloc failed");
+
+ if (ioctl(fd, get_termios_get_ioctl(), data) < 0) {
+ free(data);
+ RETURN_FAIL("getting termios failed");
+ }
+
+ *baudrate = get_termios_speed(data);
+
+ free(data);
+
+ RETURN_OK();
+}
+
+static enum sp_return set_baudrate(int fd, int baudrate)
+{
+ void *data;
+
+ TRACE("%d, %d", fd, baudrate);
+
+ DEBUG("Getting baud rate");
+
+ if (!(data = malloc(get_termios_size())))
+ RETURN_ERROR(SP_ERR_MEM, "termios malloc failed");
+
+ if (ioctl(fd, get_termios_get_ioctl(), data) < 0) {
+ free(data);
+ RETURN_FAIL("getting termios failed");
+ }
+
+ DEBUG("Setting baud rate");
+
+ set_termios_speed(data, baudrate);
+
+ if (ioctl(fd, get_termios_set_ioctl(), data) < 0) {
+ free(data);
+ RETURN_FAIL("setting termios failed");
+ }
+
+ free(data);
+
+ RETURN_OK();
+}
+
+#ifdef USE_TERMIOX
+static enum sp_return get_flow(int fd, int *flow)
+{
+ void *data;
+
+ TRACE("%d, %p", fd, flow);
+
+ DEBUG("Getting advanced flow control");
+
+ if (!(data = malloc(get_termiox_size())))
+ RETURN_ERROR(SP_ERR_MEM, "termiox malloc failed");
+
+ if (ioctl(fd, TCGETX, data) < 0) {
+ free(data);
+ RETURN_FAIL("getting termiox failed");
+ }
+
+ *flow = get_termiox_flow(data);
+
+ free(data);
+
+ RETURN_OK();
+}
+
+static enum sp_return set_flow(int fd, int flow)
+{
+ void *data;
+
+ TRACE("%d, %d", fd, flow);
+
+ DEBUG("Getting advanced flow control");
+
+ if (!(data = malloc(get_termiox_size())))
+ RETURN_ERROR(SP_ERR_MEM, "termiox malloc failed");
+
+ if (ioctl(fd, TCGETX, data) < 0) {
+ free(data);
+ RETURN_FAIL("getting termiox failed");
+ }
+
+ DEBUG("Setting advanced flow control");
+
+ set_termiox_flow(data, flow);
+
+ if (ioctl(fd, TCSETX, data) < 0) {
+ free(data);
+ RETURN_FAIL("setting termiox failed");
+ }
+
+ free(data);
+
+ RETURN_OK();
+}
+#endif /* USE_TERMIOX */
+#endif /* __linux__ */
+
+static enum sp_return get_config(struct sp_port *port, struct port_data *data,
+ struct sp_port_config *config)
+{
+ unsigned int i;
+
+ TRACE("%p, %p, %p", port, data, config);
+
+ DEBUG("Getting configuration for port %s", port->name);
+
+#ifdef _WIN32
+ if (!GetCommState(port->hdl, &data->dcb))
+ RETURN_FAIL("GetCommState() failed");
+
+ for (i = 0; i < NUM_STD_BAUDRATES; i++) {
+ if (data->dcb.BaudRate == std_baudrates[i].index) {
+ config->baudrate = std_baudrates[i].value;
+ break;
+ }
+ }
+
+ if (i == NUM_STD_BAUDRATES)
+ /* BaudRate field can be either an index or a custom baud rate. */
+ config->baudrate = data->dcb.BaudRate;
+
+ config->bits = data->dcb.ByteSize;
+
+ if (data->dcb.fParity)
+ switch (data->dcb.Parity) {
+ case NOPARITY:
+ config->parity = SP_PARITY_NONE;
+ break;
+ case EVENPARITY:
+ config->parity = SP_PARITY_EVEN;
+ break;
+ case ODDPARITY:
+ config->parity = SP_PARITY_ODD;
+ break;
+ default:
+ config->parity = -1;
+ }
+ else
+ config->parity = SP_PARITY_NONE;
+
+ switch (data->dcb.StopBits) {
+ case ONESTOPBIT:
+ config->stopbits = 1;
+ break;
+ case TWOSTOPBITS:
+ config->stopbits = 2;
+ break;
+ default:
+ config->stopbits = -1;
+ }
+
+ switch (data->dcb.fRtsControl) {
+ case RTS_CONTROL_DISABLE:
+ config->rts = SP_RTS_OFF;
+ break;
+ case RTS_CONTROL_ENABLE:
+ config->rts = SP_RTS_ON;
+ break;
+ case RTS_CONTROL_HANDSHAKE:
+ config->rts = SP_RTS_FLOW_CONTROL;
+ break;
+ default:
+ config->rts = -1;
+ }
+
+ config->cts = data->dcb.fOutxCtsFlow ? SP_CTS_FLOW_CONTROL : SP_CTS_IGNORE;
+
+ switch (data->dcb.fDtrControl) {
+ case DTR_CONTROL_DISABLE:
+ config->dtr = SP_DTR_OFF;
+ break;
+ case DTR_CONTROL_ENABLE:
+ config->dtr = SP_DTR_ON;
+ break;
+ case DTR_CONTROL_HANDSHAKE:
+ config->dtr = SP_DTR_FLOW_CONTROL;
+ break;
+ default:
+ config->dtr = -1;
+ }
+
+ config->dsr = data->dcb.fOutxDsrFlow ? SP_DSR_FLOW_CONTROL : SP_DSR_IGNORE;
+
+ if (data->dcb.fInX) {
+ if (data->dcb.fOutX)
+ config->xon_xoff = SP_XONXOFF_INOUT;
+ else
+ config->xon_xoff = SP_XONXOFF_IN;
+ } else {
+ if (data->dcb.fOutX)
+ config->xon_xoff = SP_XONXOFF_OUT;
+ else
+ config->xon_xoff = SP_XONXOFF_DISABLED;
+ }
+
+#else // !_WIN32
+
+ if (tcgetattr(port->fd, &data->term) < 0)
+ RETURN_FAIL("tcgetattr() failed");
+
+ if (ioctl(port->fd, TIOCMGET, &data->controlbits) < 0)
+ RETURN_FAIL("TIOCMGET ioctl failed");
+
+#ifdef USE_TERMIOX
+ int ret = get_flow(port->fd, &data->flow);
+
+ if (ret == SP_ERR_FAIL && errno == EINVAL)
+ data->termiox_supported = 0;
+ else if (ret < 0)
+ RETURN_CODEVAL(ret);
+ else
+ data->termiox_supported = 1;
+#else
+ data->termiox_supported = 0;
+#endif
+
+ for (i = 0; i < NUM_STD_BAUDRATES; i++) {
+ if (cfgetispeed(&data->term) == std_baudrates[i].index) {
+ config->baudrate = std_baudrates[i].value;
+ break;
+ }
+ }
+
+ if (i == NUM_STD_BAUDRATES) {
+#ifdef __APPLE__
+ config->baudrate = (int)data->term.c_ispeed;
+#elif defined(__linux__)
+ TRY(get_baudrate(port->fd, &config->baudrate));
+#else
+ config->baudrate = -1;
+#endif
+ }
+
+ switch (data->term.c_cflag & CSIZE) {
+ case CS8:
+ config->bits = 8;
+ break;
+ case CS7:
+ config->bits = 7;
+ break;
+ case CS6:
+ config->bits = 6;
+ break;
+ case CS5:
+ config->bits = 5;
+ break;
+ default:
+ config->bits = -1;
+ }
+
+ if (!(data->term.c_cflag & PARENB) && (data->term.c_iflag & IGNPAR))
+ config->parity = SP_PARITY_NONE;
+ else if (!(data->term.c_cflag & PARENB) || (data->term.c_iflag & IGNPAR))
+ config->parity = -1;
+ else
+ config->parity = (data->term.c_cflag & PARODD) ? SP_PARITY_ODD : SP_PARITY_EVEN;
+
+ config->stopbits = (data->term.c_cflag & CSTOPB) ? 2 : 1;
+
+ if (data->term.c_cflag & CRTSCTS) {
+ config->rts = SP_RTS_FLOW_CONTROL;
+ config->cts = SP_CTS_FLOW_CONTROL;
+ } else {
+ if (data->termiox_supported && data->flow & RTS_FLOW)
+ config->rts = SP_RTS_FLOW_CONTROL;
+ else
+ config->rts = (data->controlbits & TIOCM_RTS) ? SP_RTS_ON : SP_RTS_OFF;
+
+ config->cts = (data->termiox_supported && data->flow & CTS_FLOW) ?
+ SP_CTS_FLOW_CONTROL : SP_CTS_IGNORE;
+ }
+
+ if (data->termiox_supported && data->flow & DTR_FLOW)
+ config->dtr = SP_DTR_FLOW_CONTROL;
+ else
+ config->dtr = (data->controlbits & TIOCM_DTR) ? SP_DTR_ON : SP_DTR_OFF;
+
+ config->dsr = (data->termiox_supported && data->flow & DSR_FLOW) ?
+ SP_DSR_FLOW_CONTROL : SP_DSR_IGNORE;
+
+ if (data->term.c_iflag & IXOFF) {
+ if (data->term.c_iflag & IXON)
+ config->xon_xoff = SP_XONXOFF_INOUT;
+ else
+ config->xon_xoff = SP_XONXOFF_IN;
+ } else {
+ if (data->term.c_iflag & IXON)
+ config->xon_xoff = SP_XONXOFF_OUT;
+ else
+ config->xon_xoff = SP_XONXOFF_DISABLED;
+ }
+#endif