1 /* mbed Microcontroller Library
2 * Copyright (c) 2006-2013 ARM Limited
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
16 #include "LocalFileSystem.h"
18 #if DEVICE_LOCALFILESYSTEM
20 #include "semihost_api.h"
26 /* Extension to FINFO type defined in RTL.h (in Keil RL) - adds 'create time'. */
28 unsigned char hr; /* Hours [0..23] */
29 unsigned char min; /* Minutes [0..59] */
30 unsigned char sec; /* Seconds [0..59] */
31 unsigned char day; /* Day [1..31] */
32 unsigned char mon; /* Month [1..12] */
33 unsigned short year; /* Year [1980..2107] */
36 typedef struct { /* File Search info record */
37 char name[32]; /* File name */
38 long size; /* File size in bytes */
39 int fileID; /* System File Identification */
40 FTIME create_time; /* Date & time file was created */
41 FTIME write_time; /* Date & time of last write */
44 #define RESERVED_FOR_USER_APPLICATIONS (0x100) /* 0x100 - 0x1ff */
45 #define USR_XFFIND (RESERVED_FOR_USER_APPLICATIONS + 0)
47 static int xffind (const char *pattern, XFINFO *info) {
50 param[0] = (unsigned long)pattern;
51 param[1] = (unsigned long)strlen(pattern);
52 param[2] = (unsigned long)info;
53 param[3] = (unsigned long)sizeof(XFINFO);
55 return __semihost(USR_XFFIND, param);
63 #define OPEN_INVALID -1
65 int posix_to_semihost_open_flags(int flags) {
66 /* POSIX flags -> semihosting open mode */
71 if (flags & O_APPEND) {
73 } else if (flags & O_TRUNC) {
78 } else if (flags & O_WRONLY) {
80 if (flags & O_APPEND) {
85 } else if (flags == O_RDONLY) {
90 openmode = OPEN_INVALID;
96 FILEHANDLE local_file_open(const char* name, int flags) {
97 int openmode = posix_to_semihost_open_flags(flags);
98 if (openmode == OPEN_INVALID) {
99 return (FILEHANDLE)NULL;
102 FILEHANDLE fh = semihost_open(name, openmode);
104 return (FILEHANDLE)NULL;
110 LocalFileHandle::LocalFileHandle(FILEHANDLE fh) : _fh(fh), pos(0) {
113 int LocalFileHandle::close() {
114 int retval = semihost_close(_fh);
119 ssize_t LocalFileHandle::write(const void *buffer, size_t length) {
120 ssize_t n = semihost_write(_fh, (const unsigned char*)buffer, length, 0); // number of characters not written
121 n = length - n; // number of characters written
126 ssize_t LocalFileHandle::read(void *buffer, size_t length) {
127 ssize_t n = semihost_read(_fh, (unsigned char*)buffer, length, 0); // number of characters not read
128 n = length - n; // number of characters read
133 int LocalFileHandle::isatty() {
134 return semihost_istty(_fh);
137 off_t LocalFileHandle::lseek(off_t position, int whence) {
138 if (whence == SEEK_CUR) {
140 } else if (whence == SEEK_END) {
141 position += semihost_flen(_fh);
142 } /* otherwise SEEK_SET, so position is fine */
144 /* Always seems to return -1, so just ignore for now. */
145 semihost_seek(_fh, position);
150 int LocalFileHandle::fsync() {
151 return semihost_ensure(_fh);
154 off_t LocalFileHandle::flen() {
155 return semihost_flen(_fh);
158 class LocalDirHandle : public DirHandle {
161 struct dirent cur_entry;
164 LocalDirHandle() : cur_entry(), info() {
167 virtual int closedir() {
172 virtual struct dirent *readdir() {
173 if (xffind("*", &info)!=0) {
176 memcpy(cur_entry.d_name, info.name, sizeof(info.name));
180 virtual void rewinddir() {
184 virtual off_t telldir() {
188 virtual void seekdir(off_t offset) {
189 info.fileID = offset;
193 FileHandle *LocalFileSystem::open(const char* name, int flags) {
194 /* reject filenames with / in them */
195 for (const char *tmp = name; *tmp; tmp++) {
201 int openmode = posix_to_semihost_open_flags(flags);
202 if (openmode == OPEN_INVALID) {
206 FILEHANDLE fh = semihost_open(name, openmode);
210 return new LocalFileHandle(fh);
213 int LocalFileSystem::remove(const char *filename) {
214 return semihost_remove(filename);
217 DirHandle *LocalFileSystem::opendir(const char *name) {
218 return new LocalDirHandle();