Nut/OS  4.10.3
API Reference
fopen.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  * $Log$
00036  * Revision 1.3  2009/02/13 14:52:05  haraldkipp
00037  * Include memdebug.h for heap management debugging support.
00038  *
00039  * Revision 1.2  2008/08/11 06:59:40  haraldkipp
00040  * BSD types replaced by stdint types (feature request #1282721).
00041  *
00042  * Revision 1.1.1.1  2003/05/09 14:40:26  haraldkipp
00043  * Initial using 3.2.1
00044  *
00045  * Revision 1.1  2003/02/04 17:49:05  harald
00046  * *** empty log message ***
00047  *
00048  */
00049 
00050 #include "nut_io.h"
00051 
00052 #include <errno.h>
00053 #include <io.h>
00054 #include <fcntl.h>
00055 #include <stdlib.h>
00056 #include <memdebug.h>
00057 
00062 
00063 FILE *__iob[FOPEN_MAX] = { (FILE *) 1, (FILE *) 2, (FILE *) 3 };
00064 
00083 FILE *fopen(CONST char *name, CONST char *mode)
00084 {
00085     int mflags = _O_TEXT;
00086     uint_fast8_t i;
00087 
00088     /*
00089      * Translate file mode.
00090      */
00091     if ((mflags = _fmode(mode)) == EOF)
00092         return 0;
00093 
00094     for (i = 3; __iob[i]; i++)
00095         if (i >= FOPEN_MAX - 1) {
00096             errno = ENFILE;
00097             return 0;
00098         }
00099 
00100     if ((__iob[i] = malloc(sizeof(FILE))) == 0)
00101         return 0;
00102 
00103     if ((__iob[i]->iob_fd = _open(name, mflags)) == -1) {
00104         free(__iob[i]);
00105         __iob[i] = 0;
00106         return 0;
00107     }
00108 
00109     __iob[i]->iob_mode = mflags;
00110     __iob[i]->iob_flags = 0;
00111     __iob[i]->iob_unget = 0;
00112 
00113     return __iob[i];
00114 }
00115