open.c

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00001 /*
00002  * Copyright (C) 2001-2003 by egnite Software GmbH. All rights reserved.
00003  *
00004  * Redistribution and use in source and binary forms, with or without
00005  * modification, are permitted provided that the following conditions
00006  * are met:
00007  *
00008  * 1. Redistributions of source code must retain the above copyright
00009  *    notice, this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright
00011  *    notice, this list of conditions and the following disclaimer in the
00012  *    documentation and/or other materials provided with the distribution.
00013  * 3. Neither the name of the copyright holders nor the names of
00014  *    contributors may be used to endorse or promote products derived
00015  *    from this software without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY EGNITE SOFTWARE GMBH AND CONTRIBUTORS
00018  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
00019  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
00020  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL EGNITE
00021  * SOFTWARE GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
00022  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
00023  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
00024  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
00025  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
00026  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
00027  * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00028  * SUCH DAMAGE.
00029  *
00030  * For additional information see http://www.ethernut.de/
00031  *
00032  */
00033 
00034 /*
00035  * $Log: open.c,v $
00036  * Revision 1.4  2006/03/16 15:25:20  haraldkipp
00037  * Changed human readable strings from u_char to char to stop GCC 4 from
00038  * nagging about signedness.
00039  *
00040  * Revision 1.3  2004/03/16 16:48:27  haraldkipp
00041  * Added Jan Dubiec's H8/300 port.
00042  *
00043  * Revision 1.2  2003/08/05 20:01:55  haraldkipp
00044  * Typing errors corrected
00045  *
00046  * Revision 1.1.1.1  2003/05/09 14:40:30  haraldkipp
00047  * Initial using 3.2.1
00048  *
00049  * Revision 1.1  2003/02/04 17:49:08  harald
00050  * *** empty log message ***
00051  *
00052  */
00053 
00054 #include "nut_io.h"
00055 
00056 #include <errno.h>
00057 #include <sys/device.h>
00058 
00063 
00064 
00083 int _open(CONST char *name, int mode)
00084 {
00085     NUTDEVICE *dev;
00086     char dev_name[9];
00087     u_char nidx;
00088     CONST char *nptr = name;
00089 
00090     /*
00091      * Extract device name.
00092      */
00093     for (nidx = 0; *nptr && *nptr != ':' && nidx < 8; nidx++) {
00094         dev_name[nidx] = *nptr++;
00095     }
00096     dev_name[nidx] = 0;
00097 
00098     /*
00099      * Get device structure of registered device. In later releases we
00100      * try to open a file on a root device.
00101      */
00102     if ((dev = NutDeviceLookup(dev_name)) == 0) {
00103         errno = ENOENT;
00104         return -1;
00105     }
00106 
00107     /*
00108      * We should check, if the mode flags are device conformant.
00109      */
00110 
00111     /*
00112      * If a device name was specified, open this device. Otherwise open
00113      * a file on the device.
00114      */
00115     if (*nptr++ != ':')
00116         nptr = 0;
00117     return (int) ((uptr_t) ((*dev->dev_open) (dev, nptr, mode, 0)));
00118 }
00119 

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