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mbed library sources

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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

Import librarymbed

The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

api/FileHandle.h@9:0ce32e54c9a7, 2013-06-10 (annotated)

Committer:
emilmont
Date:
Mon Jun 10 16:03:00 2013 +0100
Revision:
9:0ce32e54c9a7
Parent:
cpp/FileHandle.h@2:143cac498751
Child:
10:3bc89ef62ce7
Refactoring of the mbed SDK:

- Provide a well defined HAL and API

- Keep separated the HAL implementations for the different targets

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 0:fd0d7bdfcdc2 1 /* mbed Microcontroller Library
emilmont 2:143cac498751 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 0:fd0d7bdfcdc2 3 *
emilmont 2:143cac498751 4 * Licensed under the Apache License, Version 2.0 (the "License");
emilmont 2:143cac498751 5 * you may not use this file except in compliance with the License.
emilmont 2:143cac498751 6 * You may obtain a copy of the License at
mbed_official 0:fd0d7bdfcdc2 7 *
emilmont 2:143cac498751 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 0:fd0d7bdfcdc2 9 *
emilmont 2:143cac498751 10 * Unless required by applicable law or agreed to in writing, software
emilmont 2:143cac498751 11 * distributed under the License is distributed on an "AS IS" BASIS,
emilmont 2:143cac498751 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
emilmont 2:143cac498751 13 * See the License for the specific language governing permissions and
emilmont 2:143cac498751 14 * limitations under the License.
mbed_official 0:fd0d7bdfcdc2 15 */
mbed_official 0:fd0d7bdfcdc2 16 #ifndef MBED_FILEHANDLE_H
mbed_official 0:fd0d7bdfcdc2 17 #define MBED_FILEHANDLE_H
mbed_official 0:fd0d7bdfcdc2 18
mbed_official 0:fd0d7bdfcdc2 19 typedef int FILEHANDLE;
mbed_official 0:fd0d7bdfcdc2 20
mbed_official 0:fd0d7bdfcdc2 21 #include <stdio.h>
emilmont 2:143cac498751 22
emilmont 2:143cac498751 23 #if defined(__ARMCC_VERSION) || defined(__ICCARM__)
mbed_official 0:fd0d7bdfcdc2 24 typedef int ssize_t;
mbed_official 0:fd0d7bdfcdc2 25 typedef long off_t;
emilmont 2:143cac498751 26
mbed_official 0:fd0d7bdfcdc2 27 #else
emilmont 2:143cac498751 28 # include <sys/types.h>
mbed_official 0:fd0d7bdfcdc2 29 #endif
mbed_official 0:fd0d7bdfcdc2 30
emilmont 2:143cac498751 31 namespace mbed {
mbed_official 0:fd0d7bdfcdc2 32
mbed_official 0:fd0d7bdfcdc2 33 /** An OO equivalent of the internal FILEHANDLE variable
mbed_official 0:fd0d7bdfcdc2 34 * and associated _sys_* functions.
mbed_official 0:fd0d7bdfcdc2 35 *
mbed_official 0:fd0d7bdfcdc2 36 * FileHandle is an abstract class, needing at least sys_write and
mbed_official 0:fd0d7bdfcdc2 37 * sys_read to be implmented for a simple interactive device.
mbed_official 0:fd0d7bdfcdc2 38 *
emilmont 2:143cac498751 39 * No one ever directly tals to/instanciates a FileHandle - it gets
mbed_official 0:fd0d7bdfcdc2 40 * created by FileSystem, and wrapped up by stdio.
mbed_official 0:fd0d7bdfcdc2 41 */
mbed_official 0:fd0d7bdfcdc2 42 class FileHandle {
mbed_official 0:fd0d7bdfcdc2 43
mbed_official 0:fd0d7bdfcdc2 44 public:
mbed_official 0:fd0d7bdfcdc2 45 /** Write the contents of a buffer to the file
mbed_official 0:fd0d7bdfcdc2 46 *
mbed_official 0:fd0d7bdfcdc2 47 * @param buffer the buffer to write from
mbed_official 0:fd0d7bdfcdc2 48 * @param length the number of characters to write
mbed_official 0:fd0d7bdfcdc2 49 *
mbed_official 0:fd0d7bdfcdc2 50 * @returns
mbed_official 0:fd0d7bdfcdc2 51 * The number of characters written (possibly 0) on success, -1 on error.
mbed_official 0:fd0d7bdfcdc2 52 */
mbed_official 0:fd0d7bdfcdc2 53 virtual ssize_t write(const void* buffer, size_t length) = 0;
mbed_official 0:fd0d7bdfcdc2 54
mbed_official 0:fd0d7bdfcdc2 55 /** Close the file
mbed_official 0:fd0d7bdfcdc2 56 *
mbed_official 0:fd0d7bdfcdc2 57 * @returns
mbed_official 0:fd0d7bdfcdc2 58 * Zero on success, -1 on error.
mbed_official 0:fd0d7bdfcdc2 59 */
mbed_official 0:fd0d7bdfcdc2 60 virtual int close() = 0;
mbed_official 0:fd0d7bdfcdc2 61
mbed_official 0:fd0d7bdfcdc2 62 /** Function read
mbed_official 0:fd0d7bdfcdc2 63 * Reads the contents of the file into a buffer
mbed_official 0:fd0d7bdfcdc2 64 *
mbed_official 0:fd0d7bdfcdc2 65 * @param buffer the buffer to read in to
mbed_official 0:fd0d7bdfcdc2 66 * @param length the number of characters to read
mbed_official 0:fd0d7bdfcdc2 67 *
mbed_official 0:fd0d7bdfcdc2 68 * @returns
mbed_official 0:fd0d7bdfcdc2 69 * The number of characters read (zero at end of file) on success, -1 on error.
mbed_official 0:fd0d7bdfcdc2 70 */
mbed_official 0:fd0d7bdfcdc2 71 virtual ssize_t read(void* buffer, size_t length) = 0;
mbed_official 0:fd0d7bdfcdc2 72
mbed_official 0:fd0d7bdfcdc2 73 /** Check if the handle is for a interactive terminal device.
mbed_official 0:fd0d7bdfcdc2 74 * If so, line buffered behaviour is used by default
mbed_official 0:fd0d7bdfcdc2 75 *
mbed_official 0:fd0d7bdfcdc2 76 * @returns
mbed_official 0:fd0d7bdfcdc2 77 * 1 if it is a terminal,
mbed_official 0:fd0d7bdfcdc2 78 * 0 otherwise
mbed_official 0:fd0d7bdfcdc2 79 */
mbed_official 0:fd0d7bdfcdc2 80 virtual int isatty() = 0;
mbed_official 0:fd0d7bdfcdc2 81
mbed_official 0:fd0d7bdfcdc2 82 /** Move the file position to a given offset from a given location.
mbed_official 0:fd0d7bdfcdc2 83 *
mbed_official 0:fd0d7bdfcdc2 84 * @param offset The offset from whence to move to
mbed_official 0:fd0d7bdfcdc2 85 * @param whence SEEK_SET for the start of the file, SEEK_CUR for the
mbed_official 0:fd0d7bdfcdc2 86 * current file position, or SEEK_END for the end of the file.
mbed_official 0:fd0d7bdfcdc2 87 *
mbed_official 0:fd0d7bdfcdc2 88 * @returns
mbed_official 0:fd0d7bdfcdc2 89 * new file position on success,
mbed_official 0:fd0d7bdfcdc2 90 * -1 on failure or unsupported
mbed_official 0:fd0d7bdfcdc2 91 */
mbed_official 0:fd0d7bdfcdc2 92 virtual off_t lseek(off_t offset, int whence) = 0;
mbed_official 0:fd0d7bdfcdc2 93
mbed_official 0:fd0d7bdfcdc2 94 /** Flush any buffers associated with the FileHandle, ensuring it
mbed_official 0:fd0d7bdfcdc2 95 * is up to date on disk
mbed_official 0:fd0d7bdfcdc2 96 *
mbed_official 0:fd0d7bdfcdc2 97 * @returns
mbed_official 0:fd0d7bdfcdc2 98 * 0 on success or un-needed,
mbed_official 0:fd0d7bdfcdc2 99 * -1 on error
mbed_official 0:fd0d7bdfcdc2 100 */
mbed_official 0:fd0d7bdfcdc2 101 virtual int fsync() = 0;
mbed_official 0:fd0d7bdfcdc2 102
mbed_official 0:fd0d7bdfcdc2 103 virtual off_t flen() {
mbed_official 0:fd0d7bdfcdc2 104 /* remember our current position */
mbed_official 0:fd0d7bdfcdc2 105 off_t pos = lseek(0, SEEK_CUR);
mbed_official 0:fd0d7bdfcdc2 106 if(pos == -1) return -1;
mbed_official 0:fd0d7bdfcdc2 107 /* seek to the end to get the file length */
mbed_official 0:fd0d7bdfcdc2 108 off_t res = lseek(0, SEEK_END);
mbed_official 0:fd0d7bdfcdc2 109 /* return to our old position */
mbed_official 0:fd0d7bdfcdc2 110 lseek(pos, SEEK_SET);
mbed_official 0:fd0d7bdfcdc2 111 return res;
mbed_official 0:fd0d7bdfcdc2 112 }
emilmont 2:143cac498751 113
mbed_official 0:fd0d7bdfcdc2 114 virtual ~FileHandle();
mbed_official 0:fd0d7bdfcdc2 115 };
mbed_official 0:fd0d7bdfcdc2 116
mbed_official 0:fd0d7bdfcdc2 117 } // namespace mbed
mbed_official 0:fd0d7bdfcdc2 118
mbed_official 0:fd0d7bdfcdc2 119 #endif