ttycat.c
Author: cmaier@cmassoc.net

    /*====================================================================*
     *
     *   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.
     *
     *--------------------------------------------------------------------*/

    /*====================================================================*
     *
     *   ttycat.c - serial port test program;
     *
     *   write one or more files to a serial device;
     *
     *--------------------------------------------------------------------*/

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

    #include <stdlib.h>
    #include <limits.h>
    #include <memory.h>
    #include <signal.h>
    #include <termios.h>
    #include <unistd.h>

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

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

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

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

    /*====================================================================*
     *   program warnings;
     *--------------------------------------------------------------------*/

    #if defined (WIN32)
    #error "This program does not support Windows platforms"
    #endif

    /*====================================================================*
     *
     *   signed copy (signed ifd, signed ofd, void * memory, signed extent)
     *
     *   copy ifd to ofd using a buffer of specified size;
     *
     *--------------------------------------------------------------------*/

    static signed copy (signed ifd, signed ofd, void * memory, signed extent)

    {
    	while ((extent = read (ifd, memory, extent)) > 0)
    	{
    		if (write (ofd, memory, extent) < extent)
    		{
    			return (-1);
    		}
    	}
    	return (0);
    }

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

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

    {
    	static char const * optv [] =
    	{
    		"s:",
    		PUTOPTV_S_FUNNEL,
    		"copy one or more files to a  serial device",
    		"s n\tline speed is (n) [115200]",
    		(char const *)(0)
    	};
    	struct termios restore;
    	struct termios current;
    	speed_t speed = B115200;
    	byte buffer [512];
    	signed c;
    	while ((c = getoptv (argc, argv, optv)) != -1)
    	{
    		switch (c)
    		{
    		case 's':
    			if (baudrate (uintspec (optarg, 0, UINT_MAX), &speed))
    			{
    				error (1, 0, "could not set baud rate");
    			}
    			break;
    		default:
    			break;
    		}
    	}
    	argc -= optind;
    	argv += optind;
    	if (!isatty (STDOUT_FILENO))
    	{
    		error (1, ENOTSUP, "stdout must be a serial line device");
    	}
    	tcflush (STDOUT_FILENO, TCIFLUSH);
    	tcgetattr (STDOUT_FILENO, &restore);
    	memset (&current, 0, sizeof (current));
    	current.c_cflag = speed | CS8 | CLOCAL | CREAD;
    	current.c_iflag = IGNPAR;
    	current.c_oflag = 0;
    	current.c_lflag = 0;
    	current.c_cc [VTIME] = 0;
    	current.c_cc [VMIN] = 5;
    	tcsetattr (STDOUT_FILENO, TCSANOW, &current);
    	if (!argc)
    	{
    		copy (STDIN_FILENO, STDOUT_FILENO, buffer, sizeof (buffer));
    	}
    	while ((argc) && (* argv))
    	{
    		if (efreopen (* argv, "rb", stdin))
    		{
    			copy (STDIN_FILENO, STDOUT_FILENO, buffer, sizeof (buffer));
    		}
    		argc--;
    		argv++;
    	}
    	tcsetattr (STDOUT_FILENO, TCSANOW, &restore);
    	exit (0);
    }

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