    /*====================================================================*
     *
     *   Copyright (c) 2013 Qualcomm Atheros, Inc.
     *
     *   All rights reserved.
     *
     *   Redistribution and use in source and binary forms, with or
     *   without modification, are permitted (subject to the limitations
     *   in the disclaimer below) provided that the following conditions
     *   are met:
     *
     *   * Redistributions of source code must retain the above copyright
     *     notice, this list of conditions and the following disclaimer.
     *
     *   * Redistributions in binary form must reproduce the above
     *     copyright notice, this list of conditions and the following
     *     disclaimer in the documentation and/or other materials
     *     provided with the distribution.
     *
     *   * Neither the name of Qualcomm Atheros nor the names of
     *     its contributors may be used to endorse or promote products
     *     derived from this software without specific prior written
     *     permission.
     *
     *   NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE
     *   GRANTED BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE
     *   COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
     *   IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     *   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     *   PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
     *   OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     *   NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     *   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     *   HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     *   CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
     *   OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     *   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     *--------------------------------------------------------------------*/

    /*====================================================================*
     *
     *   ttyrecv.c
     *
     *   Contributor(s):
     *	Nathaniel Houghton <nhoughto@qca.qualcomm.com>
     *
     *--------------------------------------------------------------------*/

    /*====================================================================*
     *   system header files;
     *--------------------------------------------------------------------*/

    #include <sys/time.h>
    #include <sys/types.h>

    #include <fcntl.h>
    #include <limits.h>
    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include <unistd.h>
    #include <termios.h>

    /*====================================================================*
     *   custom header files;
     *--------------------------------------------------------------------*/

    #include "../tools/error.h"
    #include "../tools/putoptv.h"
    #include "../tools/getoptv.h"
    #include "../tools/number.h"
    #include "../tools/types.h"
    #include "../tools/flags.h"
    #include "../serial/serial.h"

    /*====================================================================*
     *   custom source files;
     *--------------------------------------------------------------------*/

    #ifndef MAKEFILE
    #include "../tools/getoptv.c"
    #include "../tools/putoptv.c"
    #include "../tools/version.c"
    #include "../tools/error.c"
    #include "../tools/uintspec.c"
    #include "../tools/todigit.c"
    #endif

    #ifndef MAKEFILE
    #include "../serial/baudrate.c"
    #endif

    /*====================================================================*
     *   program constants;
     *--------------------------------------------------------------------*/

    #define SERIAL_PORT "/dev/ttyS0"

    #define TTYRECV_VERBOSE (1 << 0)

    /*====================================================================*
     *
     *   double ttyrecv (int ifd, int ofd, size_t time, size_t chunk_size, flag_t flags) ;
     *
     *--------------------------------------------------------------------*/

    static double ttyrecv (int ifd, int ofd, size_t time, size_t chunk_size, flag_t flags)

    {
    	char *buf;
    	char *p;
    	ssize_t r;
    	ssize_t w;
    	size_t bytes_read;
    	struct timeval tv_start,
    	tv_now,
    	tv_result;
    	struct timeval tv_timeout;
    	double bytes_sec;
    	fd_set rfd;
    	buf = malloc (chunk_size);
    	if (buf == NULL)
    	{
    		error (1, errno, "could not allocate memory");
    	}
    	tcflush (ifd, TCIFLUSH);
    	FD_ZERO (&rfd);
    	FD_SET (ifd, &rfd);
    	tv_timeout.tv_sec = 5;
    	tv_timeout.tv_usec = 0;
    	if (select (ifd + 1, &rfd, NULL, NULL, &tv_timeout) != 1)
    	{
    		error (1, errno, "timed out waiting for data");
    	}
    	if (gettimeofday (&tv_start, NULL) == -1)
    	{
    		error (1, errno, "could not get time");
    	}
    	if (_anyset (flags, TTYRECV_VERBOSE))
    	{
    		fprintf (stderr, "Started receive timer.\n");
    	}
    	bytes_read = 0;
    	do
    	{
    		FD_ZERO (&rfd);
    		FD_SET (ifd, &rfd);
    		tv_timeout.tv_sec = 1;
    		tv_timeout.tv_usec = 0;
    		if (select (ifd + 1, &rfd, NULL, NULL, &tv_timeout) == 1)
    		{
    			r = read (ifd, buf, chunk_size);
    			if (r == -1)
    			{
    				error (1, 0, "could not read");
    			}
    			bytes_read += r;
    			if (ofd != -1)
    			{
    				p = buf;
    				while (r)
    				{
    					w = write (ofd, p, r);
    					if (w == -1)
    					{
    						error (1, errno, "could not write");
    					}
    					p += w;
    					r -= w;
    				}
    			}
    		}
    		if (gettimeofday (&tv_now, NULL) == -1)
    		{
    			error (1, errno, "could not get time");
    		}
    		timersub (&tv_now, &tv_start, &tv_result);
    	}
    	while (tv_result.tv_sec < (signed)(time));
    	bytes_sec = bytes_read / (tv_result.tv_sec + tv_result.tv_usec / 1000000.0);
    	free (buf);
    	return (bytes_sec * 8 / 1000.0);
    }

    /*====================================================================*
     *
     *   int main (int argc, char const * argv []);
     *
     *
     *--------------------------------------------------------------------*/

    int main (int argc, char const * argv [])

    {
    	static char const * optv [] =
    	{
    		"cl:rs:t:qv",
    		"",
    		"Serial Line Rate Tester",
    		"c\tconsume received data (do not output to stdout)",
    		"l f\tserial port is (f) [" SERIAL_PORT "]",
    		"r\tprint the receive data rate to stdout",
    		"s n\tport speed [ 115200 ]",
    		"t n\treceive for (n) seconds [ 10 ]",
    		"q\tquiet mode",
    		"v\tverbose mode",
    		(char const *) (0)
    	};
    	struct termios termios;
    	char * line = SERIAL_PORT;
    	double rate = 0;
    	speed_t speed = B115200;
    	size_t time = 10;
    	size_t chunk_size = 256;
    	flag_t flags = 0;
    	signed consume = 0;
    	signed rflag = 0;
    	signed fd;
    	signed c;
    	optind = 1;
    	while ((c = getoptv (argc, argv, optv)) != -1)
    	{
    		switch ((char) (c))
    		{
    		case 'c':
    			consume = 1;
    			break;
    		case 'r':
    			rflag = 1;
    			break;
    		case 'l':
    			line = optarg;
    			break;
    		case 's':
    			if (baudrate (uintspec (optarg, 0, UINT_MAX), &speed))
    			{
    				error (1, 0, "could not set baud rate");
    			}
    			break;
    		case 't':
    			time = uintspec (optarg, 0, SIZE_MAX);
    			break;
    		case 'v':
    			_setbits (flags, TTYRECV_VERBOSE);
    			break;
    		default:
    			break;
    		}
    	}
    	argc -= optind;
    	argv += optind;
    	fd = open (line, O_RDWR | O_NONBLOCK | O_NOCTTY);
    	if (fd == - 1)
    	{
    		error (1, errno, "could not open %s", line);
    	}
    	if (fcntl(fd, F_SETFL, 0) == -1)
    	{
    		error (1, errno, "failed to set tty flags");
    	}
    	if (tcgetattr (fd, & termios) == - 1)
    	{
    		error (1, errno, "could not get tty attributes");
    	}
    	cfmakeraw (& termios);
    	termios.c_cflag = CS8 | CREAD | CLOCAL;
    	if (cfsetspeed (& termios, speed) == - 1)
    	{
    		error (1, errno, "could not set tty speed");
    	}
    	if (tcsetattr (fd, TCSANOW, &termios) == -1)
    	{
    		error (1, errno, "could not set tty attributes");
    	}
    	if (!consume)
    	{
    		rate = ttyrecv (fd, STDOUT_FILENO, time, chunk_size, flags);
    	}
    	else
    	{
    		rate = ttyrecv (fd, -1, time, chunk_size, flags);
    	}
    	if (rflag)
    	{
    		fprintf (stderr, "%.02f Kbps\n", rate);
    	}
    	close (fd);
    	return (0);
    }

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