Steven Wray
mbed library sources. Supersedes mbed-src.
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Diff: common/LocalFileSystem.cpp
- Revision:
- 144:ef7eb2e8f9f7
- Parent:
- 0:9b334a45a8ff
--- a/common/LocalFileSystem.cpp Tue Aug 02 14:07:36 2016 +0000
+++ b/common/LocalFileSystem.cpp Fri Sep 02 15:07:44 2016 +0100
@@ -1,223 +1,275 @@
-/* mbed Microcontroller Library
- * Copyright (c) 2006-2013 ARM Limited
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-#include "LocalFileSystem.h"
-
-#if DEVICE_LOCALFILESYSTEM
-
-#include "semihost_api.h"
-#include <string.h>
-#include <stdio.h>
-
-namespace mbed {
-
-/* Extension to FINFO type defined in RTL.h (in Keil RL) - adds 'create time'. */
-typedef struct {
- unsigned char hr; /* Hours [0..23] */
- unsigned char min; /* Minutes [0..59] */
- unsigned char sec; /* Seconds [0..59] */
- unsigned char day; /* Day [1..31] */
- unsigned char mon; /* Month [1..12] */
- unsigned short year; /* Year [1980..2107] */
-} FTIME;
-
-typedef struct { /* File Search info record */
- char name[32]; /* File name */
- long size; /* File size in bytes */
- int fileID; /* System File Identification */
- FTIME create_time; /* Date & time file was created */
- FTIME write_time; /* Date & time of last write */
-} XFINFO;
-
-#define RESERVED_FOR_USER_APPLICATIONS (0x100) /* 0x100 - 0x1ff */
-#define USR_XFFIND (RESERVED_FOR_USER_APPLICATIONS + 0)
-
-static int xffind (const char *pattern, XFINFO *info) {
- unsigned param[4];
-
- param[0] = (unsigned long)pattern;
- param[1] = (unsigned long)strlen(pattern);
- param[2] = (unsigned long)info;
- param[3] = (unsigned long)sizeof(XFINFO);
-
- return __semihost(USR_XFFIND, param);
-}
-
-#define OPEN_R 0
-#define OPEN_B 1
-#define OPEN_PLUS 2
-#define OPEN_W 4
-#define OPEN_A 8
-#define OPEN_INVALID -1
-
-int posix_to_semihost_open_flags(int flags) {
- /* POSIX flags -> semihosting open mode */
- int openmode;
- if (flags & O_RDWR) {
- /* a plus mode */
- openmode = OPEN_PLUS;
- if (flags & O_APPEND) {
- openmode |= OPEN_A;
- } else if (flags & O_TRUNC) {
- openmode |= OPEN_W;
- } else {
- openmode |= OPEN_R;
- }
- } else if (flags & O_WRONLY) {
- /* write or append */
- if (flags & O_APPEND) {
- openmode = OPEN_A;
- } else {
- openmode = OPEN_W;
- }
- } else if (flags == O_RDONLY) {
- /* read mode */
- openmode = OPEN_R;
- } else {
- /* invalid flags */
- openmode = OPEN_INVALID;
- }
-
- return openmode;
-}
-
-FILEHANDLE local_file_open(const char* name, int flags) {
- int openmode = posix_to_semihost_open_flags(flags);
- if (openmode == OPEN_INVALID) {
- return (FILEHANDLE)NULL;
- }
-
- FILEHANDLE fh = semihost_open(name, openmode);
- if (fh == -1) {
- return (FILEHANDLE)NULL;
- }
-
- return fh;
-}
-
-LocalFileHandle::LocalFileHandle(FILEHANDLE fh) : _fh(fh), pos(0) {
-}
-
-int LocalFileHandle::close() {
- int retval = semihost_close(_fh);
- delete this;
- return retval;
-}
-
-ssize_t LocalFileHandle::write(const void *buffer, size_t length) {
- ssize_t n = semihost_write(_fh, (const unsigned char*)buffer, length, 0); // number of characters not written
- n = length - n; // number of characters written
- pos += n;
- return n;
-}
-
-ssize_t LocalFileHandle::read(void *buffer, size_t length) {
- ssize_t n = semihost_read(_fh, (unsigned char*)buffer, length, 0); // number of characters not read
- n = length - n; // number of characters read
- pos += n;
- return n;
-}
-
-int LocalFileHandle::isatty() {
- return semihost_istty(_fh);
-}
-
-off_t LocalFileHandle::lseek(off_t position, int whence) {
- if (whence == SEEK_CUR) {
- position += pos;
- } else if (whence == SEEK_END) {
- position += semihost_flen(_fh);
- } /* otherwise SEEK_SET, so position is fine */
-
- /* Always seems to return -1, so just ignore for now. */
- semihost_seek(_fh, position);
- pos = position;
- return position;
-}
-
-int LocalFileHandle::fsync() {
- return semihost_ensure(_fh);
-}
-
-off_t LocalFileHandle::flen() {
- return semihost_flen(_fh);
-}
-
-class LocalDirHandle : public DirHandle {
-
-public:
- struct dirent cur_entry;
- XFINFO info;
-
- LocalDirHandle() : cur_entry(), info() {
- }
-
- virtual int closedir() {
- delete this;
- return 0;
- }
-
- virtual struct dirent *readdir() {
- if (xffind("*", &info)!=0) {
- return NULL;
- }
- memcpy(cur_entry.d_name, info.name, sizeof(info.name));
- return &cur_entry;
- }
-
- virtual void rewinddir() {
- info.fileID = 0;
- }
-
- virtual off_t telldir() {
- return info.fileID;
- }
-
- virtual void seekdir(off_t offset) {
- info.fileID = offset;
- }
-};
-
-FileHandle *LocalFileSystem::open(const char* name, int flags) {
- /* reject filenames with / in them */
- for (const char *tmp = name; *tmp; tmp++) {
- if (*tmp == '/') {
- return NULL;
- }
- }
-
- int openmode = posix_to_semihost_open_flags(flags);
- if (openmode == OPEN_INVALID) {
- return NULL;
- }
-
- FILEHANDLE fh = semihost_open(name, openmode);
- if (fh == -1) {
- return NULL;
- }
- return new LocalFileHandle(fh);
-}
-
-int LocalFileSystem::remove(const char *filename) {
- return semihost_remove(filename);
-}
-
-DirHandle *LocalFileSystem::opendir(const char *name) {
- return new LocalDirHandle();
-}
-
-} // namespace mbed
-
-#endif
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "LocalFileSystem.h"
+
+#if DEVICE_LOCALFILESYSTEM
+
+#include "semihost_api.h"
+#include <string.h>
+#include <stdio.h>
+
+namespace mbed {
+
+/* Extension to FINFO type defined in RTL.h (in Keil RL) - adds 'create time'. */
+typedef struct {
+ unsigned char hr; /* Hours [0..23] */
+ unsigned char min; /* Minutes [0..59] */
+ unsigned char sec; /* Seconds [0..59] */
+ unsigned char day; /* Day [1..31] */
+ unsigned char mon; /* Month [1..12] */
+ unsigned short year; /* Year [1980..2107] */
+} FTIME;
+
+typedef struct { /* File Search info record */
+ char name[32]; /* File name */
+ long size; /* File size in bytes */
+ int fileID; /* System File Identification */
+ FTIME create_time; /* Date & time file was created */
+ FTIME write_time; /* Date & time of last write */
+} XFINFO;
+
+#define RESERVED_FOR_USER_APPLICATIONS (0x100) /* 0x100 - 0x1ff */
+#define USR_XFFIND (RESERVED_FOR_USER_APPLICATIONS + 0)
+
+static int xffind (const char *pattern, XFINFO *info) {
+ unsigned param[4];
+
+ param[0] = (unsigned long)pattern;
+ param[1] = (unsigned long)strlen(pattern);
+ param[2] = (unsigned long)info;
+ param[3] = (unsigned long)sizeof(XFINFO);
+
+ return __semihost(USR_XFFIND, param);
+}
+
+#define OPEN_R 0
+#define OPEN_B 1
+#define OPEN_PLUS 2
+#define OPEN_W 4
+#define OPEN_A 8
+#define OPEN_INVALID -1
+
+int posix_to_semihost_open_flags(int flags) {
+ /* POSIX flags -> semihosting open mode */
+ int openmode;
+ if (flags & O_RDWR) {
+ /* a plus mode */
+ openmode = OPEN_PLUS;
+ if (flags & O_APPEND) {
+ openmode |= OPEN_A;
+ } else if (flags & O_TRUNC) {
+ openmode |= OPEN_W;
+ } else {
+ openmode |= OPEN_R;
+ }
+ } else if (flags & O_WRONLY) {
+ /* write or append */
+ if (flags & O_APPEND) {
+ openmode = OPEN_A;
+ } else {
+ openmode = OPEN_W;
+ }
+ } else if (flags == O_RDONLY) {
+ /* read mode */
+ openmode = OPEN_R;
+ } else {
+ /* invalid flags */
+ openmode = OPEN_INVALID;
+ }
+
+ return openmode;
+}
+
+FILEHANDLE local_file_open(const char* name, int flags) {
+ int openmode = posix_to_semihost_open_flags(flags);
+ if (openmode == OPEN_INVALID) {
+ return (FILEHANDLE)NULL;
+ }
+
+ FILEHANDLE fh = semihost_open(name, openmode);
+ if (fh == -1) {
+ return (FILEHANDLE)NULL;
+ }
+
+ return fh;
+}
+
+LocalFileHandle::LocalFileHandle(FILEHANDLE fh) : _fh(fh), pos(0) {
+ // No lock needed in constructor
+}
+
+int LocalFileHandle::close() {
+ int retval = semihost_close(_fh);
+ delete this;
+ return retval;
+}
+
+ssize_t LocalFileHandle::write(const void *buffer, size_t length) {
+ lock();
+ ssize_t n = semihost_write(_fh, (const unsigned char*)buffer, length, 0); // number of characters not written
+ n = length - n; // number of characters written
+ pos += n;
+ unlock();
+ return n;
+}
+
+ssize_t LocalFileHandle::read(void *buffer, size_t length) {
+ lock();
+ ssize_t n = semihost_read(_fh, (unsigned char*)buffer, length, 0); // number of characters not read
+ n = length - n; // number of characters read
+ pos += n;
+ unlock();
+ return n;
+}
+
+int LocalFileHandle::isatty() {
+ lock();
+ int ret = semihost_istty(_fh);
+ unlock();
+ return ret;
+}
+
+off_t LocalFileHandle::lseek(off_t position, int whence) {
+ lock();
+ if (whence == SEEK_CUR) {
+ position += pos;
+ } else if (whence == SEEK_END) {
+ position += semihost_flen(_fh);
+ } /* otherwise SEEK_SET, so position is fine */
+
+ /* Always seems to return -1, so just ignore for now. */
+ semihost_seek(_fh, position);
+ pos = position;
+ unlock();
+ return position;
+}
+
+int LocalFileHandle::fsync() {
+ lock();
+ int ret = semihost_ensure(_fh);
+ unlock();
+ return ret;
+}
+
+off_t LocalFileHandle::flen() {
+ lock();
+ off_t off = semihost_flen(_fh);
+ unlock();
+ return off;
+}
+
+void LocalFileHandle::lock() {
+ _mutex.lock();
+}
+
+void LocalFileHandle::unlock() {
+ _mutex.unlock();
+}
+
+class LocalDirHandle : public DirHandle {
+
+public:
+ struct dirent cur_entry;
+ XFINFO info;
+
+ LocalDirHandle() : cur_entry(), info() {
+ }
+
+ virtual int closedir() {
+ // No lock can be used in destructor
+ delete this;
+ return 0;
+ }
+
+ virtual struct dirent *readdir() {
+ lock();
+ if (xffind("*", &info)!=0) {
+ unlock();
+ return NULL;
+ }
+ memcpy(cur_entry.d_name, info.name, sizeof(info.name));
+ unlock();
+ return &cur_entry;
+ }
+
+ virtual void rewinddir() {
+ lock();
+ info.fileID = 0;
+ unlock();
+ }
+
+ virtual off_t telldir() {
+ lock();
+ int fileId = info.fileID;
+ unlock();
+ return fileId;
+ }
+
+ virtual void seekdir(off_t offset) {
+ lock();
+ info.fileID = offset;
+ unlock();
+ }
+
+protected:
+ PlatformMutex _mutex;
+
+ virtual void lock() {
+ _mutex.lock();
+ }
+
+ virtual void unlock() {
+ _mutex.unlock();
+ }
+};
+
+FileHandle *LocalFileSystem::open(const char* name, int flags) {
+ // No global state modified so function is thread safe
+
+ /* reject filenames with / in them */
+ for (const char *tmp = name; *tmp; tmp++) {
+ if (*tmp == '/') {
+ return NULL;
+ }
+ }
+
+ int openmode = posix_to_semihost_open_flags(flags);
+ if (openmode == OPEN_INVALID) {
+ return NULL;
+ }
+
+ FILEHANDLE fh = semihost_open(name, openmode);
+ if (fh == -1) {
+ return NULL;
+ }
+ return new LocalFileHandle(fh);
+}
+
+int LocalFileSystem::remove(const char *filename) {
+ // No global state modified so function is thread safe
+
+ return semihost_remove(filename);
+}
+
+DirHandle *LocalFileSystem::opendir(const char *name) {
+ // No global state modified so function is thread safe
+
+ return new LocalDirHandle();
+}
+
+} // namespace mbed
+
+#endif