Tomo Yamanaka / mbed-dev

mbed library sources. Supersedes mbed-src. GR-PEACH runs on RAM.

Fork of mbed-dev by mbed official

common/LocalFileSystem.cpp@103:493a29d2d4d7, 2016-03-30 (annotated)

Committer:
1050186
Date:
Wed Mar 30 11:41:25 2016 +0000
Revision:
103:493a29d2d4d7
Parent:
0:9b334a45a8ff 
GR-PEACH runs on RAM.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 0:9b334a45a8ff 1 /* mbed Microcontroller Library
bogdanm 0:9b334a45a8ff 2 * Copyright (c) 2006-2013 ARM Limited
bogdanm 0:9b334a45a8ff 3 *
bogdanm 0:9b334a45a8ff 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 0:9b334a45a8ff 5 * you may not use this file except in compliance with the License.
bogdanm 0:9b334a45a8ff 6 * You may obtain a copy of the License at
bogdanm 0:9b334a45a8ff 7 *
bogdanm 0:9b334a45a8ff 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 0:9b334a45a8ff 9 *
bogdanm 0:9b334a45a8ff 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 0:9b334a45a8ff 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 0:9b334a45a8ff 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 0:9b334a45a8ff 13 * See the License for the specific language governing permissions and
bogdanm 0:9b334a45a8ff 14 * limitations under the License.
bogdanm 0:9b334a45a8ff 15 */
bogdanm 0:9b334a45a8ff 16 #include "LocalFileSystem.h"
bogdanm 0:9b334a45a8ff 17
bogdanm 0:9b334a45a8ff 18 #if DEVICE_LOCALFILESYSTEM
bogdanm 0:9b334a45a8ff 19
bogdanm 0:9b334a45a8ff 20 #include "semihost_api.h"
bogdanm 0:9b334a45a8ff 21 #include <string.h>
bogdanm 0:9b334a45a8ff 22 #include <stdio.h>
bogdanm 0:9b334a45a8ff 23
bogdanm 0:9b334a45a8ff 24 namespace mbed {
bogdanm 0:9b334a45a8ff 25
bogdanm 0:9b334a45a8ff 26 /* Extension to FINFO type defined in RTL.h (in Keil RL) - adds 'create time'. */
bogdanm 0:9b334a45a8ff 27 typedef struct {
bogdanm 0:9b334a45a8ff 28 unsigned char hr; /* Hours [0..23] */
bogdanm 0:9b334a45a8ff 29 unsigned char min; /* Minutes [0..59] */
bogdanm 0:9b334a45a8ff 30 unsigned char sec; /* Seconds [0..59] */
bogdanm 0:9b334a45a8ff 31 unsigned char day; /* Day [1..31] */
bogdanm 0:9b334a45a8ff 32 unsigned char mon; /* Month [1..12] */
bogdanm 0:9b334a45a8ff 33 unsigned short year; /* Year [1980..2107] */
bogdanm 0:9b334a45a8ff 34 } FTIME;
bogdanm 0:9b334a45a8ff 35
bogdanm 0:9b334a45a8ff 36 typedef struct { /* File Search info record */
bogdanm 0:9b334a45a8ff 37 char name[32]; /* File name */
bogdanm 0:9b334a45a8ff 38 long size; /* File size in bytes */
bogdanm 0:9b334a45a8ff 39 int fileID; /* System File Identification */
bogdanm 0:9b334a45a8ff 40 FTIME create_time; /* Date & time file was created */
bogdanm 0:9b334a45a8ff 41 FTIME write_time; /* Date & time of last write */
bogdanm 0:9b334a45a8ff 42 } XFINFO;
bogdanm 0:9b334a45a8ff 43
bogdanm 0:9b334a45a8ff 44 #define RESERVED_FOR_USER_APPLICATIONS (0x100) /* 0x100 - 0x1ff */
bogdanm 0:9b334a45a8ff 45 #define USR_XFFIND (RESERVED_FOR_USER_APPLICATIONS + 0)
bogdanm 0:9b334a45a8ff 46
bogdanm 0:9b334a45a8ff 47 static int xffind (const char *pattern, XFINFO *info) {
bogdanm 0:9b334a45a8ff 48 unsigned param[4];
bogdanm 0:9b334a45a8ff 49
bogdanm 0:9b334a45a8ff 50 param[0] = (unsigned long)pattern;
bogdanm 0:9b334a45a8ff 51 param[1] = (unsigned long)strlen(pattern);
bogdanm 0:9b334a45a8ff 52 param[2] = (unsigned long)info;
bogdanm 0:9b334a45a8ff 53 param[3] = (unsigned long)sizeof(XFINFO);
bogdanm 0:9b334a45a8ff 54
bogdanm 0:9b334a45a8ff 55 return __semihost(USR_XFFIND, param);
bogdanm 0:9b334a45a8ff 56 }
bogdanm 0:9b334a45a8ff 57
bogdanm 0:9b334a45a8ff 58 #define OPEN_R 0
bogdanm 0:9b334a45a8ff 59 #define OPEN_B 1
bogdanm 0:9b334a45a8ff 60 #define OPEN_PLUS 2
bogdanm 0:9b334a45a8ff 61 #define OPEN_W 4
bogdanm 0:9b334a45a8ff 62 #define OPEN_A 8
bogdanm 0:9b334a45a8ff 63 #define OPEN_INVALID -1
bogdanm 0:9b334a45a8ff 64
bogdanm 0:9b334a45a8ff 65 int posix_to_semihost_open_flags(int flags) {
bogdanm 0:9b334a45a8ff 66 /* POSIX flags -> semihosting open mode */
bogdanm 0:9b334a45a8ff 67 int openmode;
bogdanm 0:9b334a45a8ff 68 if (flags & O_RDWR) {
bogdanm 0:9b334a45a8ff 69 /* a plus mode */
bogdanm 0:9b334a45a8ff 70 openmode = OPEN_PLUS;
bogdanm 0:9b334a45a8ff 71 if (flags & O_APPEND) {
bogdanm 0:9b334a45a8ff 72 openmode |= OPEN_A;
bogdanm 0:9b334a45a8ff 73 } else if (flags & O_TRUNC) {
bogdanm 0:9b334a45a8ff 74 openmode |= OPEN_W;
bogdanm 0:9b334a45a8ff 75 } else {
bogdanm 0:9b334a45a8ff 76 openmode |= OPEN_R;
bogdanm 0:9b334a45a8ff 77 }
bogdanm 0:9b334a45a8ff 78 } else if (flags & O_WRONLY) {
bogdanm 0:9b334a45a8ff 79 /* write or append */
bogdanm 0:9b334a45a8ff 80 if (flags & O_APPEND) {
bogdanm 0:9b334a45a8ff 81 openmode = OPEN_A;
bogdanm 0:9b334a45a8ff 82 } else {
bogdanm 0:9b334a45a8ff 83 openmode = OPEN_W;
bogdanm 0:9b334a45a8ff 84 }
bogdanm 0:9b334a45a8ff 85 } else if (flags == O_RDONLY) {
bogdanm 0:9b334a45a8ff 86 /* read mode */
bogdanm 0:9b334a45a8ff 87 openmode = OPEN_R;
bogdanm 0:9b334a45a8ff 88 } else {
bogdanm 0:9b334a45a8ff 89 /* invalid flags */
bogdanm 0:9b334a45a8ff 90 openmode = OPEN_INVALID;
bogdanm 0:9b334a45a8ff 91 }
bogdanm 0:9b334a45a8ff 92
bogdanm 0:9b334a45a8ff 93 return openmode;
bogdanm 0:9b334a45a8ff 94 }
bogdanm 0:9b334a45a8ff 95
bogdanm 0:9b334a45a8ff 96 FILEHANDLE local_file_open(const char* name, int flags) {
bogdanm 0:9b334a45a8ff 97 int openmode = posix_to_semihost_open_flags(flags);
bogdanm 0:9b334a45a8ff 98 if (openmode == OPEN_INVALID) {
bogdanm 0:9b334a45a8ff 99 return (FILEHANDLE)NULL;
bogdanm 0:9b334a45a8ff 100 }
bogdanm 0:9b334a45a8ff 101
bogdanm 0:9b334a45a8ff 102 FILEHANDLE fh = semihost_open(name, openmode);
bogdanm 0:9b334a45a8ff 103 if (fh == -1) {
bogdanm 0:9b334a45a8ff 104 return (FILEHANDLE)NULL;
bogdanm 0:9b334a45a8ff 105 }
bogdanm 0:9b334a45a8ff 106
bogdanm 0:9b334a45a8ff 107 return fh;
bogdanm 0:9b334a45a8ff 108 }
bogdanm 0:9b334a45a8ff 109
bogdanm 0:9b334a45a8ff 110 LocalFileHandle::LocalFileHandle(FILEHANDLE fh) : _fh(fh), pos(0) {
bogdanm 0:9b334a45a8ff 111 }
bogdanm 0:9b334a45a8ff 112
bogdanm 0:9b334a45a8ff 113 int LocalFileHandle::close() {
bogdanm 0:9b334a45a8ff 114 int retval = semihost_close(_fh);
bogdanm 0:9b334a45a8ff 115 delete this;
bogdanm 0:9b334a45a8ff 116 return retval;
bogdanm 0:9b334a45a8ff 117 }
bogdanm 0:9b334a45a8ff 118
bogdanm 0:9b334a45a8ff 119 ssize_t LocalFileHandle::write(const void *buffer, size_t length) {
bogdanm 0:9b334a45a8ff 120 ssize_t n = semihost_write(_fh, (const unsigned char*)buffer, length, 0); // number of characters not written
bogdanm 0:9b334a45a8ff 121 n = length - n; // number of characters written
bogdanm 0:9b334a45a8ff 122 pos += n;
bogdanm 0:9b334a45a8ff 123 return n;
bogdanm 0:9b334a45a8ff 124 }
bogdanm 0:9b334a45a8ff 125
bogdanm 0:9b334a45a8ff 126 ssize_t LocalFileHandle::read(void *buffer, size_t length) {
bogdanm 0:9b334a45a8ff 127 ssize_t n = semihost_read(_fh, (unsigned char*)buffer, length, 0); // number of characters not read
bogdanm 0:9b334a45a8ff 128 n = length - n; // number of characters read
bogdanm 0:9b334a45a8ff 129 pos += n;
bogdanm 0:9b334a45a8ff 130 return n;
bogdanm 0:9b334a45a8ff 131 }
bogdanm 0:9b334a45a8ff 132
bogdanm 0:9b334a45a8ff 133 int LocalFileHandle::isatty() {
bogdanm 0:9b334a45a8ff 134 return semihost_istty(_fh);
bogdanm 0:9b334a45a8ff 135 }
bogdanm 0:9b334a45a8ff 136
bogdanm 0:9b334a45a8ff 137 off_t LocalFileHandle::lseek(off_t position, int whence) {
bogdanm 0:9b334a45a8ff 138 if (whence == SEEK_CUR) {
bogdanm 0:9b334a45a8ff 139 position += pos;
bogdanm 0:9b334a45a8ff 140 } else if (whence == SEEK_END) {
bogdanm 0:9b334a45a8ff 141 position += semihost_flen(_fh);
bogdanm 0:9b334a45a8ff 142 } /* otherwise SEEK_SET, so position is fine */
bogdanm 0:9b334a45a8ff 143
bogdanm 0:9b334a45a8ff 144 /* Always seems to return -1, so just ignore for now. */
bogdanm 0:9b334a45a8ff 145 semihost_seek(_fh, position);
bogdanm 0:9b334a45a8ff 146 pos = position;
bogdanm 0:9b334a45a8ff 147 return position;
bogdanm 0:9b334a45a8ff 148 }
bogdanm 0:9b334a45a8ff 149
bogdanm 0:9b334a45a8ff 150 int LocalFileHandle::fsync() {
bogdanm 0:9b334a45a8ff 151 return semihost_ensure(_fh);
bogdanm 0:9b334a45a8ff 152 }
bogdanm 0:9b334a45a8ff 153
bogdanm 0:9b334a45a8ff 154 off_t LocalFileHandle::flen() {
bogdanm 0:9b334a45a8ff 155 return semihost_flen(_fh);
bogdanm 0:9b334a45a8ff 156 }
bogdanm 0:9b334a45a8ff 157
bogdanm 0:9b334a45a8ff 158 class LocalDirHandle : public DirHandle {
bogdanm 0:9b334a45a8ff 159
bogdanm 0:9b334a45a8ff 160 public:
bogdanm 0:9b334a45a8ff 161 struct dirent cur_entry;
bogdanm 0:9b334a45a8ff 162 XFINFO info;
bogdanm 0:9b334a45a8ff 163
bogdanm 0:9b334a45a8ff 164 LocalDirHandle() : cur_entry(), info() {
bogdanm 0:9b334a45a8ff 165 }
bogdanm 0:9b334a45a8ff 166
bogdanm 0:9b334a45a8ff 167 virtual int closedir() {
bogdanm 0:9b334a45a8ff 168 delete this;
bogdanm 0:9b334a45a8ff 169 return 0;
bogdanm 0:9b334a45a8ff 170 }
bogdanm 0:9b334a45a8ff 171
bogdanm 0:9b334a45a8ff 172 virtual struct dirent *readdir() {
bogdanm 0:9b334a45a8ff 173 if (xffind("*", &info)!=0) {
bogdanm 0:9b334a45a8ff 174 return NULL;
bogdanm 0:9b334a45a8ff 175 }
bogdanm 0:9b334a45a8ff 176 memcpy(cur_entry.d_name, info.name, sizeof(info.name));
bogdanm 0:9b334a45a8ff 177 return &cur_entry;
bogdanm 0:9b334a45a8ff 178 }
bogdanm 0:9b334a45a8ff 179
bogdanm 0:9b334a45a8ff 180 virtual void rewinddir() {
bogdanm 0:9b334a45a8ff 181 info.fileID = 0;
bogdanm 0:9b334a45a8ff 182 }
bogdanm 0:9b334a45a8ff 183
bogdanm 0:9b334a45a8ff 184 virtual off_t telldir() {
bogdanm 0:9b334a45a8ff 185 return info.fileID;
bogdanm 0:9b334a45a8ff 186 }
bogdanm 0:9b334a45a8ff 187
bogdanm 0:9b334a45a8ff 188 virtual void seekdir(off_t offset) {
bogdanm 0:9b334a45a8ff 189 info.fileID = offset;
bogdanm 0:9b334a45a8ff 190 }
bogdanm 0:9b334a45a8ff 191 };
bogdanm 0:9b334a45a8ff 192
bogdanm 0:9b334a45a8ff 193 FileHandle *LocalFileSystem::open(const char* name, int flags) {
bogdanm 0:9b334a45a8ff 194 /* reject filenames with / in them */
bogdanm 0:9b334a45a8ff 195 for (const char *tmp = name; *tmp; tmp++) {
bogdanm 0:9b334a45a8ff 196 if (*tmp == '/') {
bogdanm 0:9b334a45a8ff 197 return NULL;
bogdanm 0:9b334a45a8ff 198 }
bogdanm 0:9b334a45a8ff 199 }
bogdanm 0:9b334a45a8ff 200
bogdanm 0:9b334a45a8ff 201 int openmode = posix_to_semihost_open_flags(flags);
bogdanm 0:9b334a45a8ff 202 if (openmode == OPEN_INVALID) {
bogdanm 0:9b334a45a8ff 203 return NULL;
bogdanm 0:9b334a45a8ff 204 }
bogdanm 0:9b334a45a8ff 205
bogdanm 0:9b334a45a8ff 206 FILEHANDLE fh = semihost_open(name, openmode);
bogdanm 0:9b334a45a8ff 207 if (fh == -1) {
bogdanm 0:9b334a45a8ff 208 return NULL;
bogdanm 0:9b334a45a8ff 209 }
bogdanm 0:9b334a45a8ff 210 return new LocalFileHandle(fh);
bogdanm 0:9b334a45a8ff 211 }
bogdanm 0:9b334a45a8ff 212
bogdanm 0:9b334a45a8ff 213 int LocalFileSystem::remove(const char *filename) {
bogdanm 0:9b334a45a8ff 214 return semihost_remove(filename);
bogdanm 0:9b334a45a8ff 215 }
bogdanm 0:9b334a45a8ff 216
bogdanm 0:9b334a45a8ff 217 DirHandle *LocalFileSystem::opendir(const char *name) {
bogdanm 0:9b334a45a8ff 218 return new LocalDirHandle();
bogdanm 0:9b334a45a8ff 219 }
bogdanm 0:9b334a45a8ff 220
bogdanm 0:9b334a45a8ff 221 } // namespace mbed
bogdanm 0:9b334a45a8ff 222
bogdanm 0:9b334a45a8ff 223 #endif