Alessandro Angelino / mbed-hal

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Dependencies:   target-freescale

Fork of mbed-hal by Morpheus

common/LocalFileSystem.cpp@0:9c59db1fbc9e, 2016-03-23 (annotated)

Committer:
screamer
Date:
Wed Mar 23 21:36:09 2016 +0000
Revision:
0:9c59db1fbc9e
Initial revision

Who changed what in which revision?

UserRevisionLine numberNew contents of line
screamer 0:9c59db1fbc9e 1 /* mbed Microcontroller Library
screamer 0:9c59db1fbc9e 2 * Copyright (c) 2006-2013 ARM Limited
screamer 0:9c59db1fbc9e 3 *
screamer 0:9c59db1fbc9e 4 * Licensed under the Apache License, Version 2.0 (the "License");
screamer 0:9c59db1fbc9e 5 * you may not use this file except in compliance with the License.
screamer 0:9c59db1fbc9e 6 * You may obtain a copy of the License at
screamer 0:9c59db1fbc9e 7 *
screamer 0:9c59db1fbc9e 8 * http://www.apache.org/licenses/LICENSE-2.0
screamer 0:9c59db1fbc9e 9 *
screamer 0:9c59db1fbc9e 10 * Unless required by applicable law or agreed to in writing, software
screamer 0:9c59db1fbc9e 11 * distributed under the License is distributed on an "AS IS" BASIS,
screamer 0:9c59db1fbc9e 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
screamer 0:9c59db1fbc9e 13 * See the License for the specific language governing permissions and
screamer 0:9c59db1fbc9e 14 * limitations under the License.
screamer 0:9c59db1fbc9e 15 */
screamer 0:9c59db1fbc9e 16 #include "LocalFileSystem.h"
screamer 0:9c59db1fbc9e 17
screamer 0:9c59db1fbc9e 18 #if DEVICE_LOCALFILESYSTEM
screamer 0:9c59db1fbc9e 19
screamer 0:9c59db1fbc9e 20 #include "semihost_api.h"
screamer 0:9c59db1fbc9e 21 #include <string.h>
screamer 0:9c59db1fbc9e 22 #include <stdio.h>
screamer 0:9c59db1fbc9e 23
screamer 0:9c59db1fbc9e 24 namespace mbed {
screamer 0:9c59db1fbc9e 25
screamer 0:9c59db1fbc9e 26 /* Extension to FINFO type defined in RTL.h (in Keil RL) - adds 'create time'. */
screamer 0:9c59db1fbc9e 27 typedef struct {
screamer 0:9c59db1fbc9e 28 unsigned char hr; /* Hours [0..23] */
screamer 0:9c59db1fbc9e 29 unsigned char min; /* Minutes [0..59] */
screamer 0:9c59db1fbc9e 30 unsigned char sec; /* Seconds [0..59] */
screamer 0:9c59db1fbc9e 31 unsigned char day; /* Day [1..31] */
screamer 0:9c59db1fbc9e 32 unsigned char mon; /* Month [1..12] */
screamer 0:9c59db1fbc9e 33 unsigned short year; /* Year [1980..2107] */
screamer 0:9c59db1fbc9e 34 } FTIME;
screamer 0:9c59db1fbc9e 35
screamer 0:9c59db1fbc9e 36 typedef struct { /* File Search info record */
screamer 0:9c59db1fbc9e 37 char name[32]; /* File name */
screamer 0:9c59db1fbc9e 38 long size; /* File size in bytes */
screamer 0:9c59db1fbc9e 39 int fileID; /* System File Identification */
screamer 0:9c59db1fbc9e 40 FTIME create_time; /* Date & time file was created */
screamer 0:9c59db1fbc9e 41 FTIME write_time; /* Date & time of last write */
screamer 0:9c59db1fbc9e 42 } XFINFO;
screamer 0:9c59db1fbc9e 43
screamer 0:9c59db1fbc9e 44 #define RESERVED_FOR_USER_APPLICATIONS (0x100) /* 0x100 - 0x1ff */
screamer 0:9c59db1fbc9e 45 #define USR_XFFIND (RESERVED_FOR_USER_APPLICATIONS + 0)
screamer 0:9c59db1fbc9e 46
screamer 0:9c59db1fbc9e 47 static int xffind (const char *pattern, XFINFO *info) {
screamer 0:9c59db1fbc9e 48 unsigned param[4];
screamer 0:9c59db1fbc9e 49
screamer 0:9c59db1fbc9e 50 param[0] = (unsigned long)pattern;
screamer 0:9c59db1fbc9e 51 param[1] = (unsigned long)strlen(pattern);
screamer 0:9c59db1fbc9e 52 param[2] = (unsigned long)info;
screamer 0:9c59db1fbc9e 53 param[3] = (unsigned long)sizeof(XFINFO);
screamer 0:9c59db1fbc9e 54
screamer 0:9c59db1fbc9e 55 return __semihost(USR_XFFIND, param);
screamer 0:9c59db1fbc9e 56 }
screamer 0:9c59db1fbc9e 57
screamer 0:9c59db1fbc9e 58 #define OPEN_R 0
screamer 0:9c59db1fbc9e 59 #define OPEN_B 1
screamer 0:9c59db1fbc9e 60 #define OPEN_PLUS 2
screamer 0:9c59db1fbc9e 61 #define OPEN_W 4
screamer 0:9c59db1fbc9e 62 #define OPEN_A 8
screamer 0:9c59db1fbc9e 63 #define OPEN_INVALID -1
screamer 0:9c59db1fbc9e 64
screamer 0:9c59db1fbc9e 65 int posix_to_semihost_open_flags(int flags) {
screamer 0:9c59db1fbc9e 66 /* POSIX flags -> semihosting open mode */
screamer 0:9c59db1fbc9e 67 int openmode;
screamer 0:9c59db1fbc9e 68 if (flags & O_RDWR) {
screamer 0:9c59db1fbc9e 69 /* a plus mode */
screamer 0:9c59db1fbc9e 70 openmode = OPEN_PLUS;
screamer 0:9c59db1fbc9e 71 if (flags & O_APPEND) {
screamer 0:9c59db1fbc9e 72 openmode |= OPEN_A;
screamer 0:9c59db1fbc9e 73 } else if (flags & O_TRUNC) {
screamer 0:9c59db1fbc9e 74 openmode |= OPEN_W;
screamer 0:9c59db1fbc9e 75 } else {
screamer 0:9c59db1fbc9e 76 openmode |= OPEN_R;
screamer 0:9c59db1fbc9e 77 }
screamer 0:9c59db1fbc9e 78 } else if (flags & O_WRONLY) {
screamer 0:9c59db1fbc9e 79 /* write or append */
screamer 0:9c59db1fbc9e 80 if (flags & O_APPEND) {
screamer 0:9c59db1fbc9e 81 openmode = OPEN_A;
screamer 0:9c59db1fbc9e 82 } else {
screamer 0:9c59db1fbc9e 83 openmode = OPEN_W;
screamer 0:9c59db1fbc9e 84 }
screamer 0:9c59db1fbc9e 85 } else if (flags == O_RDONLY) {
screamer 0:9c59db1fbc9e 86 /* read mode */
screamer 0:9c59db1fbc9e 87 openmode = OPEN_R;
screamer 0:9c59db1fbc9e 88 } else {
screamer 0:9c59db1fbc9e 89 /* invalid flags */
screamer 0:9c59db1fbc9e 90 openmode = OPEN_INVALID;
screamer 0:9c59db1fbc9e 91 }
screamer 0:9c59db1fbc9e 92
screamer 0:9c59db1fbc9e 93 return openmode;
screamer 0:9c59db1fbc9e 94 }
screamer 0:9c59db1fbc9e 95
screamer 0:9c59db1fbc9e 96 FILEHANDLE local_file_open(const char* name, int flags) {
screamer 0:9c59db1fbc9e 97 int openmode = posix_to_semihost_open_flags(flags);
screamer 0:9c59db1fbc9e 98 if (openmode == OPEN_INVALID) {
screamer 0:9c59db1fbc9e 99 return (FILEHANDLE)NULL;
screamer 0:9c59db1fbc9e 100 }
screamer 0:9c59db1fbc9e 101
screamer 0:9c59db1fbc9e 102 FILEHANDLE fh = semihost_open(name, openmode);
screamer 0:9c59db1fbc9e 103 if (fh == -1) {
screamer 0:9c59db1fbc9e 104 return (FILEHANDLE)NULL;
screamer 0:9c59db1fbc9e 105 }
screamer 0:9c59db1fbc9e 106
screamer 0:9c59db1fbc9e 107 return fh;
screamer 0:9c59db1fbc9e 108 }
screamer 0:9c59db1fbc9e 109
screamer 0:9c59db1fbc9e 110 LocalFileHandle::LocalFileHandle(FILEHANDLE fh) : _fh(fh), pos(0) {
screamer 0:9c59db1fbc9e 111 }
screamer 0:9c59db1fbc9e 112
screamer 0:9c59db1fbc9e 113 int LocalFileHandle::close() {
screamer 0:9c59db1fbc9e 114 int retval = semihost_close(_fh);
screamer 0:9c59db1fbc9e 115 delete this;
screamer 0:9c59db1fbc9e 116 return retval;
screamer 0:9c59db1fbc9e 117 }
screamer 0:9c59db1fbc9e 118
screamer 0:9c59db1fbc9e 119 ssize_t LocalFileHandle::write(const void *buffer, size_t length) {
screamer 0:9c59db1fbc9e 120 ssize_t n = semihost_write(_fh, (const unsigned char*)buffer, length, 0); // number of characters not written
screamer 0:9c59db1fbc9e 121 n = length - n; // number of characters written
screamer 0:9c59db1fbc9e 122 pos += n;
screamer 0:9c59db1fbc9e 123 return n;
screamer 0:9c59db1fbc9e 124 }
screamer 0:9c59db1fbc9e 125
screamer 0:9c59db1fbc9e 126 ssize_t LocalFileHandle::read(void *buffer, size_t length) {
screamer 0:9c59db1fbc9e 127 ssize_t n = semihost_read(_fh, (unsigned char*)buffer, length, 0); // number of characters not read
screamer 0:9c59db1fbc9e 128 n = length - n; // number of characters read
screamer 0:9c59db1fbc9e 129 pos += n;
screamer 0:9c59db1fbc9e 130 return n;
screamer 0:9c59db1fbc9e 131 }
screamer 0:9c59db1fbc9e 132
screamer 0:9c59db1fbc9e 133 int LocalFileHandle::isatty() {
screamer 0:9c59db1fbc9e 134 return semihost_istty(_fh);
screamer 0:9c59db1fbc9e 135 }
screamer 0:9c59db1fbc9e 136
screamer 0:9c59db1fbc9e 137 off_t LocalFileHandle::lseek(off_t position, int whence) {
screamer 0:9c59db1fbc9e 138 if (whence == SEEK_CUR) {
screamer 0:9c59db1fbc9e 139 position += pos;
screamer 0:9c59db1fbc9e 140 } else if (whence == SEEK_END) {
screamer 0:9c59db1fbc9e 141 position += semihost_flen(_fh);
screamer 0:9c59db1fbc9e 142 } /* otherwise SEEK_SET, so position is fine */
screamer 0:9c59db1fbc9e 143
screamer 0:9c59db1fbc9e 144 /* Always seems to return -1, so just ignore for now. */
screamer 0:9c59db1fbc9e 145 semihost_seek(_fh, position);
screamer 0:9c59db1fbc9e 146 pos = position;
screamer 0:9c59db1fbc9e 147 return position;
screamer 0:9c59db1fbc9e 148 }
screamer 0:9c59db1fbc9e 149
screamer 0:9c59db1fbc9e 150 int LocalFileHandle::fsync() {
screamer 0:9c59db1fbc9e 151 return semihost_ensure(_fh);
screamer 0:9c59db1fbc9e 152 }
screamer 0:9c59db1fbc9e 153
screamer 0:9c59db1fbc9e 154 off_t LocalFileHandle::flen() {
screamer 0:9c59db1fbc9e 155 return semihost_flen(_fh);
screamer 0:9c59db1fbc9e 156 }
screamer 0:9c59db1fbc9e 157
screamer 0:9c59db1fbc9e 158 class LocalDirHandle : public DirHandle {
screamer 0:9c59db1fbc9e 159
screamer 0:9c59db1fbc9e 160 public:
screamer 0:9c59db1fbc9e 161 struct dirent cur_entry;
screamer 0:9c59db1fbc9e 162 XFINFO info;
screamer 0:9c59db1fbc9e 163
screamer 0:9c59db1fbc9e 164 LocalDirHandle() : cur_entry(), info() {
screamer 0:9c59db1fbc9e 165 }
screamer 0:9c59db1fbc9e 166
screamer 0:9c59db1fbc9e 167 virtual int closedir() {
screamer 0:9c59db1fbc9e 168 delete this;
screamer 0:9c59db1fbc9e 169 return 0;
screamer 0:9c59db1fbc9e 170 }
screamer 0:9c59db1fbc9e 171
screamer 0:9c59db1fbc9e 172 virtual struct dirent *readdir() {
screamer 0:9c59db1fbc9e 173 if (xffind("*", &info)!=0) {
screamer 0:9c59db1fbc9e 174 return NULL;
screamer 0:9c59db1fbc9e 175 }
screamer 0:9c59db1fbc9e 176 memcpy(cur_entry.d_name, info.name, sizeof(info.name));
screamer 0:9c59db1fbc9e 177 return &cur_entry;
screamer 0:9c59db1fbc9e 178 }
screamer 0:9c59db1fbc9e 179
screamer 0:9c59db1fbc9e 180 virtual void rewinddir() {
screamer 0:9c59db1fbc9e 181 info.fileID = 0;
screamer 0:9c59db1fbc9e 182 }
screamer 0:9c59db1fbc9e 183
screamer 0:9c59db1fbc9e 184 virtual off_t telldir() {
screamer 0:9c59db1fbc9e 185 return info.fileID;
screamer 0:9c59db1fbc9e 186 }
screamer 0:9c59db1fbc9e 187
screamer 0:9c59db1fbc9e 188 virtual void seekdir(off_t offset) {
screamer 0:9c59db1fbc9e 189 info.fileID = offset;
screamer 0:9c59db1fbc9e 190 }
screamer 0:9c59db1fbc9e 191 };
screamer 0:9c59db1fbc9e 192
screamer 0:9c59db1fbc9e 193 FileHandle *LocalFileSystem::open(const char* name, int flags) {
screamer 0:9c59db1fbc9e 194 /* reject filenames with / in them */
screamer 0:9c59db1fbc9e 195 for (const char *tmp = name; *tmp; tmp++) {
screamer 0:9c59db1fbc9e 196 if (*tmp == '/') {
screamer 0:9c59db1fbc9e 197 return NULL;
screamer 0:9c59db1fbc9e 198 }
screamer 0:9c59db1fbc9e 199 }
screamer 0:9c59db1fbc9e 200
screamer 0:9c59db1fbc9e 201 int openmode = posix_to_semihost_open_flags(flags);
screamer 0:9c59db1fbc9e 202 if (openmode == OPEN_INVALID) {
screamer 0:9c59db1fbc9e 203 return NULL;
screamer 0:9c59db1fbc9e 204 }
screamer 0:9c59db1fbc9e 205
screamer 0:9c59db1fbc9e 206 FILEHANDLE fh = semihost_open(name, openmode);
screamer 0:9c59db1fbc9e 207 if (fh == -1) {
screamer 0:9c59db1fbc9e 208 return NULL;
screamer 0:9c59db1fbc9e 209 }
screamer 0:9c59db1fbc9e 210 return new LocalFileHandle(fh);
screamer 0:9c59db1fbc9e 211 }
screamer 0:9c59db1fbc9e 212
screamer 0:9c59db1fbc9e 213 int LocalFileSystem::remove(const char *filename) {
screamer 0:9c59db1fbc9e 214 return semihost_remove(filename);
screamer 0:9c59db1fbc9e 215 }
screamer 0:9c59db1fbc9e 216
screamer 0:9c59db1fbc9e 217 DirHandle *LocalFileSystem::opendir(const char *name) {
screamer 0:9c59db1fbc9e 218 return new LocalDirHandle();
screamer 0:9c59db1fbc9e 219 }
screamer 0:9c59db1fbc9e 220
screamer 0:9c59db1fbc9e 221 } // namespace mbed
screamer 0:9c59db1fbc9e 222
screamer 0:9c59db1fbc9e 223 #endif
screamer 0:9c59db1fbc9e 224