mouvement AX12 petit robot version 2
Fork of command_AX12_petit_robot_v2 by
mbed/FileHandle.h
- Committer:
- SquirrelGod
- Date:
- 2017-04-18
- Revision:
- 2:99b1cb0d9f5e
File content as of revision 2:99b1cb0d9f5e:
/* mbed Microcontroller Library - FileHandler * Copyright (c) 2007-2009 ARM Limited. All rights reserved. */ #ifndef MBED_FILEHANDLE_H #define MBED_FILEHANDLE_H typedef int FILEHANDLE; #include <stdio.h> #ifdef __ARMCC_VERSION typedef int ssize_t; typedef long off_t; #else #include <sys/types.h> #endif namespace mbed { /* Class FileHandle * An OO equivalent of the internal FILEHANDLE variable * and associated _sys_* functions * * FileHandle is an abstract class, needing at least sys_write and * sys_read to be implmented for a simple interactive device * * No one ever directly tals to/instanciates a FileHandle - it gets * created by FileSystem, and wrapped up by stdio */ class FileHandle { public: /* Function write * Write the contents of a buffer to the file * * Parameters * buffer - the buffer to write from * length - the number of characters to write * * Returns * The number of characters written (possibly 0) on success, -1 on error. */ virtual ssize_t write(const void* buffer, size_t length) = 0; /* Function close * Close the file * * Returns * Zero on success, -1 on error. */ virtual int close() = 0; /* Function read * Reads the contents of the file into a buffer * * Parameters * buffer - the buffer to read in to * length - the number of characters to read * * Returns * The number of characters read (zero at end of file) on success, -1 on error. */ virtual ssize_t read(void* buffer, size_t length) = 0; /* Function isatty * Check if the handle is for a interactive terminal device * * If so, line buffered behaviour is used by default * * Returns * 1 if it is a terminal, 0 otherwise */ virtual int isatty() = 0 ; /* Function lseek * Move the file position to a given offset from a given location. * * Parameters * offset - The offset from whence to move to * whence - SEEK_SET for the start of the file, SEEK_CUR for the * current file position, or SEEK_END for the end of the file. * * Returns * New file position on success, -1 on failure or unsupported */ virtual off_t lseek(off_t offset, int whence) = 0; /* Function fsync * Flush any buffers associated with the FileHandle, ensuring it * is up to date on disk * * Returns * 0 on success or un-needed, -1 on error */ virtual int fsync() = 0; virtual off_t flen() { /* remember our current position */ off_t pos = lseek(0, SEEK_CUR); if(pos == -1) return -1; /* seek to the end to get the file length */ off_t res = lseek(0, SEEK_END); /* return to our old position */ lseek(pos, SEEK_SET); return res; } }; } // namespace mbed #endif