cfs-eeprom.c

00001 /*
00002  * Copyright (c) 2004, Swedish Institute of Computer Science.
00003  * All rights reserved.
00004  *
00005  * Redistribution and use in source and binary forms, with or without
00006  * modification, are permitted provided that the following conditions
00007  * are met:
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 Institute nor the names of its contributors
00014  *    may be used to endorse or promote products derived from this software
00015  *    without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
00018  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00019  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00020  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
00021  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00022  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00023  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00024  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00025  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00026  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00027  * SUCH DAMAGE.
00028  *
00029  * This file is part of the Contiki operating system.
00030  *
00031  * Author: Adam Dunkels <adam@sics.se>
00032  *
00033  * $Id: cfs-eeprom.c,v 1.11 2009/07/23 16:13:48 dak664 Exp $
00034  */
00035 
00036 #include "cfs/cfs.h"
00037 #include "dev/eeprom.h"
00038 
00039 struct filestate {
00040   int flag;
00041 #define FLAG_FILE_CLOSED 0
00042 #define FLAG_FILE_OPEN   1
00043   eeprom_addr_t fileptr;
00044   eeprom_addr_t filesize;
00045 };
00046 
00047 static struct filestate file;
00048 
00049 #ifdef CFS_EEPROM_CONF_OFFSET
00050 #define CFS_EEPROM_OFFSET CFS_EEPROM_CONF_OFFSET
00051 #else
00052 #define CFS_EEPROM_OFFSET 0
00053 #endif
00054 
00055 /*---------------------------------------------------------------------------*/
00056 int
00057 cfs_open(const char *n, int f)
00058 {
00059   if(file.flag == FLAG_FILE_CLOSED) {
00060     file.flag = FLAG_FILE_OPEN;
00061     if(f & CFS_READ) {
00062       file.fileptr = 0;
00063     }
00064     if(f & CFS_WRITE){
00065       if(f & CFS_APPEND) {
00066         file.fileptr = file.filesize;
00067       } else {
00068         file.fileptr = 0;
00069         file.filesize = 0;
00070       }
00071     }
00072     return 1;
00073   } else {
00074     return -1;
00075   }
00076 }
00077 /*---------------------------------------------------------------------------*/
00078 void
00079 cfs_close(int f)
00080 {
00081   file.flag = FLAG_FILE_CLOSED;
00082 }
00083 /*---------------------------------------------------------------------------*/
00084 int
00085 cfs_read(int f, void *buf, unsigned int len)
00086 {
00087   if(f == 1) {
00088     eeprom_read(CFS_EEPROM_OFFSET + file.fileptr, buf, len);
00089     file.fileptr += len;
00090     return len;
00091   } else {
00092     return -1;
00093   }
00094 }
00095 /*---------------------------------------------------------------------------*/
00096 int
00097 cfs_write(int f, const void *buf, unsigned int len)
00098 {
00099   if(f == 1) {
00100     eeprom_write(CFS_EEPROM_OFFSET + file.fileptr, (unsigned char *)buf, len);
00101     file.fileptr += len;
00102     return len;
00103   } else {
00104     return -1;
00105   }
00106 }
00107 /*---------------------------------------------------------------------------*/
00108 cfs_offset_t
00109 cfs_seek(int f, cfs_offset_t o, int w)
00110 {
00111   if(w == CFS_SEEK_SET && f == 1) {
00112     file.fileptr = o;
00113     return o;
00114   } else {
00115     return -1;
00116   }
00117 }
00118 /*---------------------------------------------------------------------------*/
00119 int
00120 cfs_remove(const char *name)
00121 {
00122   return -1;
00123 }
00124 /*---------------------------------------------------------------------------*/
00125 int
00126 cfs_opendir(struct cfs_dir *p, const char *n)
00127 {
00128   return -1;
00129 }
00130 /*---------------------------------------------------------------------------*/
00131 int
00132 cfs_readdir(struct cfs_dir *p, struct cfs_dirent *e)
00133 {
00134   return -1;
00135 }
00136 /*---------------------------------------------------------------------------*/
00137 void
00138 cfs_closedir(struct cfs_dir *p)
00139 {
00140 }
00141 /*---------------------------------------------------------------------------*/

Generated on Mon Apr 11 14:23:26 2011 for Contiki 2.5 by  doxygen 1.6.1