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Stream.h
1 /* mbed Microcontroller Library
2  * Copyright (c) 2006-2019 ARM Limited
3  * SPDX-License-Identifier: Apache-2.0
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 #ifndef MBED_STREAM_H
18 #define MBED_STREAM_H
19 
20 #include "platform/platform.h"
21 #include "platform/FileLike.h"
22 #include "platform/NonCopyable.h"
23 #include "platform/mbed_toolchain.h"
24 #include <cstdio>
25 #include <cstdarg>
26 
27 namespace mbed {
28 /** \addtogroup platform-public-api */
29 /** @{*/
30 
31 /**
32  * \defgroup platform_Stream Stream class
33  * @{
34  */
35 
36 extern void mbed_set_unbuffered_stream(std::FILE *_file);
37 
38 /** File stream
39  *
40  * @note Synchronization level: Set by subclass
41  */
42 class Stream : public FileLike, private NonCopyable<Stream> {
43 
44 public:
45  Stream(const char *name = NULL);
46  virtual ~Stream();
47 
48  int putc(int c);
49  int puts(const char *s);
50  int getc();
51  char *gets(char *s, int size);
52  int printf(const char *format, ...) MBED_PRINTF_METHOD(1, 2);
53  int scanf(const char *format, ...) MBED_SCANF_METHOD(1, 2);
54  int vprintf(const char *format, std::va_list args) MBED_PRINTF_METHOD(1, 0);
55  int vscanf(const char *format, std::va_list args) MBED_SCANF_METHOD(1, 0);
56 
57  operator std::FILE *()
58  {
59  return _file;
60  }
61 
62 protected:
63  virtual int close();
64  virtual ssize_t write(const void *buffer, size_t length);
65  virtual ssize_t read(void *buffer, size_t length);
66  virtual off_t seek(off_t offset, int whence);
67  virtual off_t tell();
68  virtual void rewind();
69  virtual int isatty();
70  virtual int sync();
71  virtual off_t size();
72 
73  virtual int _putc(int c) = 0;
74  virtual int _getc() = 0;
75 
76  std::FILE *_file;
77 
78  /** Acquire exclusive access to this object.
79  */
80  virtual void lock()
81  {
82  // Stub
83  }
84 
85  /** Release exclusive access to this object.
86  */
87  virtual void unlock()
88  {
89  // Stub
90  }
91 };
92 /**@}*/
93 
94 /**@}*/
95 } // namespace mbed
96 
97 #endif
98 
mbed::Stream::seek
virtual off_t seek(off_t offset, int whence)
Move the file position to a given offset from from a given location.
mbed::Stream
File stream.
Definition: Stream.h:42
mbed::Stream::write
virtual ssize_t write(const void *buffer, size_t length)
Write the contents of a buffer to a file.
mbed::NonCopyable
Prevents generation of copy constructor and copy assignment operator in derived classes.
Definition: NonCopyable.h:169
mbed::Stream::close
virtual int close()
Close a file.
mbed::Stream::tell
virtual off_t tell()
Get the file position of the file.
mbed::Stream::rewind
virtual void rewind()
Rewind the file position to the beginning of the file.
mbed::Stream::isatty
virtual int isatty()
Check if the file in an interactive terminal device.
mbed::Stream::sync
virtual int sync()
Flush any buffers associated with the file.
mbed::FileLike
Class FileLike.
Definition: FileLike.h:38
mbed::Stream::unlock
virtual void unlock()
Release exclusive access to this object.
Definition: Stream.h:87
mbed::Stream::read
virtual ssize_t read(void *buffer, size_t length)
Read the contents of a file into a buffer.
mbed::Stream::lock
virtual void lock()
Acquire exclusive access to this object.
Definition: Stream.h:80
mbed::Stream::size
virtual off_t size()
Get the size of the file.
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