[libserialport.git] / serialport.c

/*
 * This file is part of the libserialport project.
 *
 * Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com>
 * Copyright (C) 2010-2012 Uwe Hermann <uwe@hermann-uwe.de>
 * Copyright (C) 2013 Martin Ling <martin-libserialport@earth.li>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#ifdef _WIN32
#include <windows.h>
#else
#include <termios.h>
#include <sys/ioctl.h>
#endif
#include <stdlib.h>
#include <errno.h>

#include "serialport.h"

static int sp_validate_port(struct sp_port *port)
{
	if (port == NULL)
		return 0;
#ifdef _WIN32
	if (port->hdl == INVALID_HANDLE_VALUE)
		return 0;
#else
	if (port->fd < 0)
		return 0;
#endif
	return 1;
}

#define CHECK_PORT() do { if (!sp_validate_port(port)) return SP_ERR_ARG; } while (0)

/**
 * Open the specified serial port.
 *
 * @param port Pointer to empty port structure allocated by caller.
 * @param portname Name of port to open.
 * @param flags Flags to use when opening the serial port. Possible flags
 *              are: SP_MODE_RDWR, SP_MODE_RDONLY, SP_MODE_NONBLOCK.
 *
 * @return SP_OK on success, SP_ERR_FAIL on failure,
 *         or SP_ERR_ARG if an invalid port or name is passed.
 */
int sp_open(struct sp_port *port, char *portname, int flags)
{
	if (!port)
		return SP_ERR_ARG;

	if (!portname)
		return SP_ERR_ARG;

	port->name = portname;

#ifdef _WIN32
	DWORD desired_access = 0, flags_and_attributes = 0;
	/* Map 'flags' to the OS-specific settings. */
	desired_access |= GENERIC_READ;
	flags_and_attributes = FILE_ATTRIBUTE_NORMAL;
	if (flags & SP_MODE_RDWR)
		desired_access |= GENERIC_WRITE;
	if (flags & SP_MODE_NONBLOCK)
		flags_and_attributes |= FILE_FLAG_OVERLAPPED;

	port->hdl = CreateFile(port->name, desired_access, 0, 0,
			 OPEN_EXISTING, flags_and_attributes, 0);
	if (port->hdl == INVALID_HANDLE_VALUE)
		return SP_ERR_FAIL;
#else
	int flags_local = 0;
	/* Map 'flags' to the OS-specific settings. */
	if (flags & SP_MODE_RDWR)
		flags_local |= O_RDWR;
	if (flags & SP_MODE_RDONLY)
		flags_local |= O_RDONLY;
	if (flags & SP_MODE_NONBLOCK)
		flags_local |= O_NONBLOCK;

	if ((port->fd = open(port->name, flags_local)) < 0)
		return SP_ERR_FAIL;
#endif

	return SP_OK;
}

/**
 * Close the specified serial port.
 *
 * @param port Pointer to port structure.
 *
 * @return SP_OK on success, SP_ERR_FAIL on failure,
 *         or SP_ERR_ARG if an invalid port is passed.
 */
int sp_close(struct sp_port *port)
{
	CHECK_PORT();

#ifdef _WIN32
	/* Returns non-zero upon success, 0 upon failure. */
	if (CloseHandle(port->hdl) == 0)
		return SP_ERR_FAIL;
#else
	/* Returns 0 upon success, -1 upon failure. */
	if (close(port->fd) == -1)
		return SP_ERR_FAIL;
#endif

	return SP_OK;
}

/**
 * Flush serial port buffers.
 *
 * @param port Pointer to port structure.
 *
 * @return SP_OK on success, SP_ERR_FAIL on failure,
 *         or SP_ERR_ARG if an invalid port is passed.
 */
int sp_flush(struct sp_port *port)
{
	CHECK_PORT();

#ifdef _WIN32
	/* Returns non-zero upon success, 0 upon failure. */
	if (PurgeComm(port->hdl, PURGE_RXCLEAR | PURGE_TXCLEAR) == 0)
		return SP_ERR_FAIL;
#else
	/* Returns 0 upon success, -1 upon failure. */
	if (tcflush(port->fd, TCIOFLUSH) < 0)
		return SP_ERR_FAIL;
#endif
	return SP_OK;
}

/**
 * Write a number of bytes to the specified serial port.
 *
 * @param port Pointer to port structure.
 * @param buf Buffer containing the bytes to write.
 * @param count Number of bytes to write.
 *
 * @return The number of bytes written, SP_ERR_FAIL on failure,
 *         or SP_ERR_ARG if an invalid port is passed.
 */
int sp_write(struct sp_port *port, const void *buf, size_t count)
{
	CHECK_PORT();

	if (!buf)
		return SP_ERR_ARG;

#ifdef _WIN32
	DWORD written = 0;
	/* Returns non-zero upon success, 0 upon failure. */
	if (WriteFile(port->hdl, buf, count, &written, NULL) == 0)
		return SP_ERR_FAIL;
	return written;
#else
	/* Returns the number of bytes written, or -1 upon failure. */
	ssize_t written = write(port->fd, buf, count);
	if (written < 0)
		return SP_ERR_FAIL;
	else
		return written;;
#endif
}

/**
 * Read a number of bytes from the specified serial port.
 *
 * @param port Pointer to port structure.
 * @param buf Buffer where to store the bytes that are read.
 * @param count The number of bytes to read.
 *
 * @return The number of bytes read, SP_ERR_FAIL on failure,
 *         or SP_ERR_ARG if an invalid port is passed.
 */
int sp_read(struct sp_port *port, void *buf, size_t count)
{
	CHECK_PORT();

	if (!buf)
		return SP_ERR_ARG;

#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 SP_ERR_FAIL;
	return 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)
		return SP_ERR_FAIL;
	return bytes_read;
#endif
}

/**
 * Set serial parameters for the specified serial port.
 *
 * @param port Pointer to port structure.
 * @param baudrate The baudrate to set.
 * @param bits The number of data bits to use.
 * @param parity The parity setting to use (0 = none, 1 = even, 2 = odd).
 * @param stopbits The number of stop bits to use (1 or 2).
 * @param flowcontrol The flow control settings to use (0 = none, 1 = RTS/CTS,
 *                    2 = XON/XOFF).
 *
 * @return The number of bytes read, SP_ERR_FAIL on failure,
 *         or SP_ERR_ARG if an invalid argument is passed.
 */
int sp_set_params(struct sp_port *port, int baudrate,
			      int bits, int parity, int stopbits,
			      int flowcontrol, int rts, int dtr)
{
	CHECK_PORT();

#ifdef _WIN32
	DCB dcb;

	if (!GetCommState(port->hdl, &dcb))
		return SP_ERR_FAIL;

	switch (baudrate) {
	/*
	 * The baudrates 50/75/134/150/200/1800/230400/460800 do not seem to
	 * have documented CBR_* macros.
	 */
	case 110:
		dcb.BaudRate = CBR_110;
		break;
	case 300:
		dcb.BaudRate = CBR_300;
		break;
	case 600:
		dcb.BaudRate = CBR_600;
		break;
	case 1200:
		dcb.BaudRate = CBR_1200;
		break;
	case 2400:
		dcb.BaudRate = CBR_2400;
		break;
	case 4800:
		dcb.BaudRate = CBR_4800;
		break;
	case 9600:
		dcb.BaudRate = CBR_9600;
		break;
	case 14400:
		dcb.BaudRate = CBR_14400; /* Not available on Unix? */
		break;
	case 19200:
		dcb.BaudRate = CBR_19200;
		break;
	case 38400:
		dcb.BaudRate = CBR_38400;
		break;
	case 57600:
		dcb.BaudRate = CBR_57600;
		break;
	case 115200:
		dcb.BaudRate = CBR_115200;
		break;
	case 128000:
		dcb.BaudRate = CBR_128000; /* Not available on Unix? */
		break;
	case 256000:
		dcb.BaudRate = CBR_256000; /* Not available on Unix? */
		break;
	default:
		return SP_ERR_ARG;
	}

	switch (stopbits) {
	/* Note: There's also ONE5STOPBITS == 1.5 (unneeded so far). */
	case 1:
		dcb.StopBits = ONESTOPBIT;
		break;
	case 2:
		dcb.StopBits = TWOSTOPBITS;
		break;
	default:
		return SP_ERR_ARG;
	}

	switch (parity) {
	/* Note: There's also SPACEPARITY, MARKPARITY (unneeded so far). */
	case SP_PARITY_NONE:
		dcb.Parity = NOPARITY;
		break;
	case SP_PARITY_EVEN:
		dcb.Parity = EVENPARITY;
		break;
	case SP_PARITY_ODD:
		dcb.Parity = ODDPARITY;
		break;
	default:
		return SP_ERR_ARG;
	}

	if (rts != -1) {
		if (rts)
			dcb.fRtsControl = RTS_CONTROL_ENABLE;
		else
			dcb.fRtsControl = RTS_CONTROL_DISABLE;
	}

	if (dtr != -1) {
		if (dtr)
			dcb.fDtrControl = DTR_CONTROL_ENABLE;
		else
			dcb.fDtrControl = DTR_CONTROL_DISABLE;
	}

	if (!SetCommState(port->hdl, &dcb))
		return SP_ERR_FAIL;
#else
	struct termios term;
	speed_t baud;
	int controlbits;

	if (tcgetattr(port->fd, &term) < 0)
		return SP_ERR_FAIL;

	switch (baudrate) {
	case 50:
		baud = B50;
		break;
	case 75:
		baud = B75;
		break;
	case 110:
		baud = B110;
		break;
	case 134:
		baud = B134;
		break;
	case 150:
		baud = B150;
		break;
	case 200:
		baud = B200;
		break;
	case 300:
		baud = B300;
		break;
	case 600:
		baud = B600;
		break;
	case 1200:
		baud = B1200;
		break;
	case 1800:
		baud = B1800;
		break;
	case 2400:
		baud = B2400;
		break;
	case 4800:
		baud = B4800;
		break;
	case 9600:
		baud = B9600;
		break;
	case 19200:
		baud = B19200;
		break;
	case 38400:
		baud = B38400;
		break;
	case 57600:
		baud = B57600;
		break;
	case 115200:
		baud = B115200;
		break;
	case 230400:
		baud = B230400;
		break;
#if !defined(__APPLE__) && !defined(__OpenBSD__)
	case 460800:
		baud = B460800;
		break;
#endif
	default:
		return SP_ERR_ARG;
	}

	if (cfsetospeed(&term, baud) < 0)
		return SP_ERR_FAIL;

	if (cfsetispeed(&term, baud) < 0)
		return SP_ERR_FAIL;

	term.c_cflag &= ~CSIZE;
	switch (bits) {
	case 8:
		term.c_cflag |= CS8;
		break;
	case 7:
		term.c_cflag |= CS7;
		break;
	default:
		return SP_ERR_ARG;
	}

	term.c_cflag &= ~CSTOPB;
	switch (stopbits) {
	case 1:
		term.c_cflag &= ~CSTOPB;
		break;
	case 2:
		term.c_cflag |= CSTOPB;
		break;
	default:
		return SP_ERR_ARG;
	}

	term.c_iflag &= ~(IXON | IXOFF);
	term.c_cflag &= ~CRTSCTS;
	switch (flowcontrol) {
	case 0:
		/* No flow control. */
		break;
	case 1:
		term.c_cflag |= CRTSCTS;
		break;
	case 2:
		term.c_iflag |= IXON | IXOFF;
		break;
	default:
		return SP_ERR_ARG;
	}

	term.c_iflag &= ~IGNPAR;
	term.c_cflag &= ~(PARODD | PARENB);
	switch (parity) {
	case SP_PARITY_NONE:
		term.c_iflag |= IGNPAR;
		break;
	case SP_PARITY_EVEN:
		term.c_cflag |= PARENB;
		break;
	case SP_PARITY_ODD:
		term.c_cflag |= PARENB | PARODD;
		break;
	default:
		return SP_ERR_ARG;
	}

	/* Turn off all serial port cooking. */
	term.c_iflag &= ~(ISTRIP | INLCR | ICRNL);
	term.c_oflag &= ~(ONLCR | OCRNL | ONOCR);
#if !defined(__FreeBSD__) && !defined(__OpenBSD__) && !defined(__NetBSD__)
	term.c_oflag &= ~OFILL;
#endif

	/* Disable canonical mode, and don't echo input characters. */
	term.c_lflag &= ~(ICANON | ECHO);

	/* Write the configured settings. */
	if (tcsetattr(port->fd, TCSADRAIN, &term) < 0)
		return SP_ERR_FAIL;

	if (rts != -1) {
		controlbits = TIOCM_RTS;
		if (ioctl(port->fd, rts ? TIOCMBIS : TIOCMBIC,
				&controlbits) < 0)
			return SP_ERR_FAIL;
	}

	if (dtr != -1) {
		controlbits = TIOCM_DTR;
		if (ioctl(port->fd, dtr ? TIOCMBIS : TIOCMBIC,
				&controlbits) < 0)
			return SP_ERR_FAIL;
	}
#endif

	return SP_OK;
}

/**
 * Get error code for failed operation.
 *
 * In order to obtain the correct result, this function should be called
 * straight after the failure, before executing any other system operations.
 *
 * @return The system's numeric code for the error that caused the last
 *         operation to fail.
 */
int sp_last_error_code(void)
{
#ifdef _WIN32
	return GetLastError();
#else
	return errno;
#endif
}

/**
 * Get error message for failed operation.
 *
 * In order to obtain the correct result, this function should be called
 * straight after the failure, before executing other system operations.
 *
 * @return The system's message for the error that caused the last
 *         operation to fail. This string may be allocated by the function,
 *         and can be freed after use by calling sp_free_error_message.
 */
char *sp_last_error_message(void)
{
#ifdef _WIN32
	LPVOID message;
	DWORD error = GetLastError();

	FormatMessage(
		FORMAT_MESSAGE_ALLOCATE_BUFFER |
		FORMAT_MESSAGE_FROM_SYSTEM |
		FORMAT_MESSAGE_IGNORE_INSERTS,
		NULL,
		error,
		MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
		(LPTSTR) &message,
		0, NULL );

	return message;
#else
	return strerror(errno);
#endif
}

/**
 * Free error message.
 *
 * This function can be used to free a string returned by the
 * sp_last_error_message function.
 */
void sp_free_error_message(char *message)
{
#ifdef _WIN32
	LocalFree(message);
#else
	(void)message;
#endif
}
Commit	Line	Data
74510d4b ML	1	/*
	2	* This file is part of the libserialport project.
	3	*
	4	* Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com>
	5	* Copyright (C) 2010-2012 Uwe Hermann <uwe@hermann-uwe.de>
	6	* Copyright (C) 2013 Martin Ling <martin-libserialport@earth.li>
	7	*
	8	* This program is free software: you can redistribute it and/or modify
	9	* it under the terms of the GNU Lesser General Public License as
	10	* published by the Free Software Foundation, either version 3 of the
	11	* License, or (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU Lesser General Public License
	19	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	20	*/
	21
	22	#include <string.h>
	23	#include <sys/types.h>
	24	#include <sys/stat.h>
	25	#include <fcntl.h>
	26	#include <unistd.h>
	27	#ifdef _WIN32
	28	#include <windows.h>
	29	#else
74510d4b ML	30	#include <termios.h>
	31	#include <sys/ioctl.h>
	32	#endif
	33	#include <stdlib.h>
	34	#include <errno.h>
	35
	36	#include "serialport.h"
	37
	38	static int sp_validate_port(struct sp_port *port)
	39	{
	40	if (port == NULL)
	41	return 0;
	42	#ifdef _WIN32
	43	if (port->hdl == INVALID_HANDLE_VALUE)
	44	return 0;
	45	#else
	46	if (port->fd < 0)
	47	return 0;
	48	#endif
	49	return 1;
	50	}
	51
	52	#define CHECK_PORT() do { if (!sp_validate_port(port)) return SP_ERR_ARG; } while (0)
	53
	54	/**
	55	* Open the specified serial port.
	56	*
	57	* @param port Pointer to empty port structure allocated by caller.
	58	* @param portname Name of port to open.
	59	* @param flags Flags to use when opening the serial port. Possible flags
	60	* are: SP_MODE_RDWR, SP_MODE_RDONLY, SP_MODE_NONBLOCK.
	61	*
	62	* @return SP_OK on success, SP_ERR_FAIL on failure,
	63	* or SP_ERR_ARG if an invalid port or name is passed.
	64	*/
	65	int sp_open(struct sp_port port, char portname, int flags)
	66	{
	67	if (!port)
	68	return SP_ERR_ARG;
	69
	70	if (!portname)
	71	return SP_ERR_ARG;
	72
	73	port->name = portname;
	74
	75	#ifdef _WIN32
	76	DWORD desired_access = 0, flags_and_attributes = 0;
	77	/* Map 'flags' to the OS-specific settings. */
	78	desired_access \|= GENERIC_READ;
	79	flags_and_attributes = FILE_ATTRIBUTE_NORMAL;
	80	if (flags & SP_MODE_RDWR)
	81	desired_access \|= GENERIC_WRITE;
	82	if (flags & SP_MODE_NONBLOCK)
	83	flags_and_attributes \|= FILE_FLAG_OVERLAPPED;
	84
	85	port->hdl = CreateFile(port->name, desired_access, 0, 0,
	86	OPEN_EXISTING, flags_and_attributes, 0);
	87	if (port->hdl == INVALID_HANDLE_VALUE)
	88	return SP_ERR_FAIL;
	89	#else
	90	int flags_local = 0;
	91	/* Map 'flags' to the OS-specific settings. */
	92	if (flags & SP_MODE_RDWR)
	93	flags_local \|= O_RDWR;
94	if (flags & SP_MODE_RDONLY)
95	flags_local \|= O_RDONLY;
96	if (flags & SP_MODE_NONBLOCK)
97	flags_local \|= O_NONBLOCK;
98
99	if ((port->fd = open(port->name, flags_local)) < 0)
100	return SP_ERR_FAIL;
101	#endif
102
103	return SP_OK;
104	}
105
106	/**
107	* Close the specified serial port.
108	*
109	* @param port Pointer to port structure.
110	*
111	* @return SP_OK on success, SP_ERR_FAIL on failure,
112	* or SP_ERR_ARG if an invalid port is passed.
113	*/
114	int sp_close(struct sp_port *port)
115	{
116	CHECK_PORT();
117
118	#ifdef _WIN32
119	/* Returns non-zero upon success, 0 upon failure. */
120	if (CloseHandle(port->hdl) == 0)
121	return SP_ERR_FAIL;
122	#else
123	/* Returns 0 upon success, -1 upon failure. */
124	if (close(port->fd) == -1)
125	return SP_ERR_FAIL;
126	#endif
127
128	return SP_OK;
129	}
130
131	/**
132	* Flush serial port buffers.
133	*
134	* @param port Pointer to port structure.
135	*
136	* @return SP_OK on success, SP_ERR_FAIL on failure,
137	* or SP_ERR_ARG if an invalid port is passed.
138	*/
139	int sp_flush(struct sp_port *port)
140	{
141	CHECK_PORT();
142
143	#ifdef _WIN32
144	/* Returns non-zero upon success, 0 upon failure. */
145	if (PurgeComm(port->hdl, PURGE_RXCLEAR \| PURGE_TXCLEAR) == 0)
146	return SP_ERR_FAIL;
147	#else
148	/* Returns 0 upon success, -1 upon failure. */
149	if (tcflush(port->fd, TCIOFLUSH) < 0)
150	return SP_ERR_FAIL;
151	#endif
152	return SP_OK;
153	}
154
155	/**
156	* Write a number of bytes to the specified serial port.
157	*
158	* @param port Pointer to port structure.
159	* @param buf Buffer containing the bytes to write.
160	* @param count Number of bytes to write.
161	*
162	* @return The number of bytes written, SP_ERR_FAIL on failure,
163	* or SP_ERR_ARG if an invalid port is passed.
164	*/
165	int sp_write(struct sp_port port, const void buf, size_t count)
166	{
167	CHECK_PORT();
168
169	if (!buf)
170	return SP_ERR_ARG;
171
172	#ifdef _WIN32
173	DWORD written = 0;
174	/* Returns non-zero upon success, 0 upon failure. */
175	if (WriteFile(port->hdl, buf, count, &written, NULL) == 0)
176	return SP_ERR_FAIL;
177	return written;
178	#else
179	/* Returns the number of bytes written, or -1 upon failure. */
180	ssize_t written = write(port->fd, buf, count);
181	if (written < 0)
182	return SP_ERR_FAIL;
183	else
184	return written;;
185	#endif
186	}
187
188	/**
189	* Read a number of bytes from the specified serial port.
190	*
191	* @param port Pointer to port structure.
192	* @param buf Buffer where to store the bytes that are read.
193	* @param count The number of bytes to read.
194	*
195	* @return The number of bytes read, SP_ERR_FAIL on failure,
196	* or SP_ERR_ARG if an invalid port is passed.
197	*/
198	int sp_read(struct sp_port port, void buf, size_t count)
199	{
200	CHECK_PORT();
201
202	if (!buf)
203	return SP_ERR_ARG;
204
205	#ifdef _WIN32
206	DWORD bytes_read = 0;
207	/* Returns non-zero upon success, 0 upon failure. */
208	if (ReadFile(port->hdl, buf, count, &bytes_read, NULL) == 0)
209	return SP_ERR_FAIL;
210	return bytes_read;
211	#else
212	ssize_t bytes_read;
213	/* Returns the number of bytes read, or -1 upon failure. */
214	if ((bytes_read = read(port->fd, buf, count)) < 0)
215	return SP_ERR_FAIL;
216	return bytes_read;
217	#endif
218	}
219
220	/**
221	* Set serial parameters for the specified serial port.
222	*
223	* @param port Pointer to port structure.
224	* @param baudrate The baudrate to set.
225	* @param bits The number of data bits to use.
226	* @param parity The parity setting to use (0 = none, 1 = even, 2 = odd).
227	* @param stopbits The number of stop bits to use (1 or 2).
228	* @param flowcontrol The flow control settings to use (0 = none, 1 = RTS/CTS,
229	* 2 = XON/XOFF).
230	*
231	* @return The number of bytes read, SP_ERR_FAIL on failure,
232	* or SP_ERR_ARG if an invalid argument is passed.
233	*/
234	int sp_set_params(struct sp_port *port, int baudrate,
235	int bits, int parity, int stopbits,
236	int flowcontrol, int rts, int dtr)
237	{
238	CHECK_PORT();
239
240	#ifdef _WIN32
241	DCB dcb;
242
243	if (!GetCommState(port->hdl, &dcb))
244	return SP_ERR_FAIL;
245
246	switch (baudrate) {
247	/*
248	* The baudrates 50/75/134/150/200/1800/230400/460800 do not seem to
249	* have documented CBR_* macros.
250	*/
251	case 110:
252	dcb.BaudRate = CBR_110;
253	break;
254	case 300:
255	dcb.BaudRate = CBR_300;
256	break;
257	case 600:
258	dcb.BaudRate = CBR_600;
259	break;
260	case 1200:
261	dcb.BaudRate = CBR_1200;
262	break;
263	case 2400:
264	dcb.BaudRate = CBR_2400;
265	break;
266	case 4800:
267	dcb.BaudRate = CBR_4800;
268	break;
269	case 9600:
270	dcb.BaudRate = CBR_9600;
271	break;
272	case 14400:
273	dcb.BaudRate = CBR_14400; /* Not available on Unix? */
274	break;
275	case 19200:
276	dcb.BaudRate = CBR_19200;
277	break;
278	case 38400:
279	dcb.BaudRate = CBR_38400;
280	break;
281	case 57600:
282	dcb.BaudRate = CBR_57600;
283	break;
284	case 115200:
285	dcb.BaudRate = CBR_115200;
286	break;
287	case 128000:
288	dcb.BaudRate = CBR_128000; /* Not available on Unix? */
289	break;
290	case 256000:
291	dcb.BaudRate = CBR_256000; /* Not available on Unix? */
292	break;
293	default:
294	return SP_ERR_ARG;
295	}
296
297	switch (stopbits) {
298	/* Note: There's also ONE5STOPBITS == 1.5 (unneeded so far). */
299	case 1:
300	dcb.StopBits = ONESTOPBIT;
301	break;
302	case 2:
303	dcb.StopBits = TWOSTOPBITS;
304	break;
305	default:
306	return SP_ERR_ARG;
307	}
308
309	switch (parity) {
310	/* Note: There's also SPACEPARITY, MARKPARITY (unneeded so far). */
311	case SP_PARITY_NONE:
312	dcb.Parity = NOPARITY;
313	break;
314	case SP_PARITY_EVEN:
315	dcb.Parity = EVENPARITY;
316	break;
317	case SP_PARITY_ODD:
318	dcb.Parity = ODDPARITY;
319	break;
320	default:
321	return SP_ERR_ARG;
322	}
323
324	if (rts != -1) {
325	if (rts)
326	dcb.fRtsControl = RTS_CONTROL_ENABLE;
327	else
328	dcb.fRtsControl = RTS_CONTROL_DISABLE;
329	}
330
331	if (dtr != -1) {
332	if (dtr)
333	dcb.fDtrControl = DTR_CONTROL_ENABLE;
334	else
335	dcb.fDtrControl = DTR_CONTROL_DISABLE;
336	}
337
338	if (!SetCommState(port->hdl, &dcb))
339	return SP_ERR_FAIL;
340	#else
341	struct termios term;
342	speed_t baud;
343	int controlbits;
344
345	if (tcgetattr(port->fd, &term) < 0)
346	return SP_ERR_FAIL;
347
348	switch (baudrate) {
349	case 50:
350	baud = B50;
351	break;
352	case 75:
353	baud = B75;
354	break;
355	case 110:
356	baud = B110;
357	break;
358	case 134:
359	baud = B134;
360	break;
361	case 150:
362	baud = B150;
363	break;
364	case 200:
365	baud = B200;
366	break;
367	case 300:
368	baud = B300;
369	break;
370	case 600:
371	baud = B600;
372	break;
373	case 1200:
374	baud = B1200;
375	break;
376	case 1800:
377	baud = B1800;
378	break;
379	case 2400:
380	baud = B2400;
381	break;
382	case 4800:
383	baud = B4800;
384	break;
385	case 9600:
386	baud = B9600;
387	break;
388	case 19200:
389	baud = B19200;
390	break;
391	case 38400:
392	baud = B38400;
393	break;
394	case 57600:
395	baud = B57600;
396	break;
397	case 115200:
398	baud = B115200;
399	break;
400	case 230400:
401	baud = B230400;
402	break;
403	#if !defined(__APPLE__) && !defined(__OpenBSD__)
404	case 460800:
405	baud = B460800;
406	break;
407	#endif
408	default:
409	return SP_ERR_ARG;
410	}
411
412	if (cfsetospeed(&term, baud) < 0)
413	return SP_ERR_FAIL;
414
415	if (cfsetispeed(&term, baud) < 0)
416	return SP_ERR_FAIL;
417
418	term.c_cflag &= ~CSIZE;
419	switch (bits) {
420	case 8:
421	term.c_cflag \|= CS8;
422	break;
423	case 7:
424	term.c_cflag \|= CS7;
425	break;
426	default:
427	return SP_ERR_ARG;
428	}
429
430	term.c_cflag &= ~CSTOPB;
431	switch (stopbits) {
432	case 1:
433	term.c_cflag &= ~CSTOPB;
434	break;
435	case 2:
436	term.c_cflag \|= CSTOPB;
437	break;
438	default:
439	return SP_ERR_ARG;
440	}
441
442	term.c_iflag &= ~(IXON \| IXOFF);
443	term.c_cflag &= ~CRTSCTS;
444	switch (flowcontrol) {
445	case 0:
446	/* No flow control. */
447	break;
448	case 1:
449	term.c_cflag \|= CRTSCTS;
450	break;
451	case 2:
452	term.c_iflag \|= IXON \| IXOFF;
453	break;
454	default:
455	return SP_ERR_ARG;
456	}
457
458	term.c_iflag &= ~IGNPAR;
459	term.c_cflag &= ~(PARODD \| PARENB);
460	switch (parity) {
461	case SP_PARITY_NONE:
462	term.c_iflag \|= IGNPAR;
463	break;
464	case SP_PARITY_EVEN:
465	term.c_cflag \|= PARENB;
466	break;
467	case SP_PARITY_ODD:
468	term.c_cflag \|= PARENB \| PARODD;
469	break;
470	default:
471	return SP_ERR_ARG;
472	}
473
474	/* Turn off all serial port cooking. */
475	term.c_iflag &= ~(ISTRIP \| INLCR \| ICRNL);
476	term.c_oflag &= ~(ONLCR \| OCRNL \| ONOCR);
477	#if !defined(__FreeBSD__) && !defined(__OpenBSD__) && !defined(__NetBSD__)
478	term.c_oflag &= ~OFILL;
479	#endif
480
481	/* Disable canonical mode, and don't echo input characters. */
482	term.c_lflag &= ~(ICANON \| ECHO);
483
484	/* Write the configured settings. */
485	if (tcsetattr(port->fd, TCSADRAIN, &term) < 0)
486	return SP_ERR_FAIL;
487
488	if (rts != -1) {
489	controlbits = TIOCM_RTS;
490	if (ioctl(port->fd, rts ? TIOCMBIS : TIOCMBIC,
491	&controlbits) < 0)
492	return SP_ERR_FAIL;
493	}
494
495	if (dtr != -1) {
496	controlbits = TIOCM_DTR;
497	if (ioctl(port->fd, dtr ? TIOCMBIS : TIOCMBIC,
498	&controlbits) < 0)
499	return SP_ERR_FAIL;
500	}
501	#endif
502
503	return SP_OK;
504	}
505
506	/**
507	* Get error code for failed operation.
508	*
509	* In order to obtain the correct result, this function should be called
510	* straight after the failure, before executing any other system operations.
511	*
512	* @return The system's numeric code for the error that caused the last
513	* operation to fail.
514	*/
515	int sp_last_error_code(void)
516	{
517	#ifdef _WIN32
518	return GetLastError();
519	#else
520	return errno;
521	#endif
522	}
523
524	/**
525	* Get error message for failed operation.
526	*
527	* In order to obtain the correct result, this function should be called
528	* straight after the failure, before executing other system operations.
529	*
530	* @return The system's message for the error that caused the last
531	* operation to fail. This string may be allocated by the function,
532	* and can be freed after use by calling sp_free_error_message.
533	*/
534	char *sp_last_error_message(void)
535	{
536	#ifdef _WIN32
537	LPVOID message;
538	DWORD error = GetLastError();
539
540	FormatMessage(
541	FORMAT_MESSAGE_ALLOCATE_BUFFER \|
542	FORMAT_MESSAGE_FROM_SYSTEM \|
543	FORMAT_MESSAGE_IGNORE_INSERTS,
544	NULL,
545	error,
546	MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
547	(LPTSTR) &message,
548	0, NULL );
549
550	return message;
551	#else
552	return strerror(errno);
553	#endif
554	}
555
556	/**
557	* Free error message.
558	*
559	* This function can be used to free a string returned by the
560	* sp_last_error_message function.
561	*/
562	void sp_free_error_message(char *message)
563	{
564	#ifdef _WIN32
565	LocalFree(message);
64eec30d ML	566	#else
64eec30d ML	567	(void)message;
74510d4b ML	568	#endif
74510d4b ML	569	}