mbed library sources modified for open wear
Dependents: openwear-lifelogger-example
Fork of mbed-src by
cpp/LocalFileSystem.cpp
- Committer:
- mbed_official
- Date:
- 2012-11-20
- Revision:
- 0:fd0d7bdfcdc2
- Child:
- 2:143cac498751
File content as of revision 0:fd0d7bdfcdc2:
/* mbed Microcontroller Library * Copyright (c) 2006-2012 ARM Limited * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ #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() { info.fileID = 0; } 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