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 1.2.4.1 2008/04/06 10:50:25 haraldkipp 00037 * Fixes bug #1903303. 00038 * 00039 * Revision 1.2 2006/01/05 16:50:13 haraldkipp 00040 * Files opened with mode 'a' or 'w' will be created, if they didn't exist. 00041 * Files opened with 'w' will be truncated, if they exist. 00042 * 00043 * Revision 1.1.1.1 2003/05/09 14:40:26 haraldkipp 00044 * Initial using 3.2.1 00045 * 00046 * Revision 1.1 2003/02/04 17:49:05 harald 00047 * *** empty log message *** 00048 * 00049 */ 00050 00051 #include "nut_io.h" 00052 00053 #include <errno.h> 00054 #include <fcntl.h> 00055 00060 00066 int _fmode(CONST char *mode) 00067 { 00068 int mflags; 00069 int pflags; 00070 int bflag = _O_TEXT; 00071 00072 switch (*mode) { 00073 case 'r': 00074 mflags = _O_RDONLY; 00075 pflags = _O_RDWR; 00076 break; 00077 case 'w': 00078 mflags = _O_WRONLY | _O_CREAT | _O_TRUNC; 00079 pflags = _O_RDWR | _O_CREAT | _O_TRUNC; 00080 break; 00081 case 'a': 00082 mflags = _O_WRONLY | _O_CREAT | _O_APPEND; 00083 pflags = _O_RDWR | _O_CREAT | _O_APPEND; 00084 break; 00085 default: 00086 errno = EINVAL; 00087 return EOF; 00088 } 00089 while (*++mode) { 00090 switch (*mode) { 00091 case '+': 00092 mflags = pflags; 00093 break; 00094 case 'b': 00095 bflag = _O_BINARY; 00096 break; 00097 default: 00098 errno = EINVAL; 00099 return EOF; 00100 } 00101 } 00102 return (mflags | bflag); 00103 } 00104