fmode.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: fmode.c,v $
00036  * Revision 1.2  2006/01/05 16:50:13  haraldkipp
00037  * Files opened with mode 'a' or 'w' will be created, if they didn't exist.
00038  * Files opened with 'w' will be truncated, if they exist.
00039  *
00040  * Revision 1.1.1.1  2003/05/09 14:40:26  haraldkipp
00041  * Initial using 3.2.1
00042  *
00043  * Revision 1.1  2003/02/04 17:49:05  harald
00044  * *** empty log message ***
00045  *
00046  */
00047 
00048 #include "nut_io.h"
00049 
00050 #include <errno.h>
00051 #include <fcntl.h>
00052 
00057 
00063 int _fmode(CONST char *mode)
00064 {
00065     int mflags = _O_TEXT;
00066 
00067     switch (*mode) {
00068     case 'r':
00069         mflags |= _O_RDONLY;
00070         break;
00071     case 'w':
00072         mflags |= _O_WRONLY | _O_CREAT | _O_TRUNC;
00073         break;
00074     case 'a':
00075         mflags |= _O_APPEND | _O_CREAT;
00076         break;
00077     default:
00078         errno = EINVAL;
00079         return EOF;
00080     }
00081     while (*++mode) {
00082         switch (*mode) {
00083         case '+':
00084             mflags &= ~(_O_RDONLY | _O_WRONLY);
00085             mflags |= _O_RDWR | _O_CREAT | _O_TRUNC;
00086             break;
00087         case 'b':
00088             mflags &= ~_O_TEXT;
00089             mflags |= _O_BINARY;
00090             break;
00091         default:
00092             errno = EINVAL;
00093             return EOF;
00094         }
00095     }
00096     return mflags;
00097 }
00098 

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