4 * This file is part of BeRTOS.
6 * Bertos is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 * As a special exception, you may use this file as part of a free software
21 * library without restriction. Specifically, if other files instantiate
22 * templates or use macros or inline functions from this file, or you compile
23 * this file and link it with other files to produce an executable, this
24 * file does not by itself cause the resulting executable to be covered by
25 * the GNU General Public License. This exception does not however
26 * invalidate any other reasons why the executable file might be covered by
27 * the GNU General Public License.
29 * Copyright 2004 Develer S.r.l. (http://www.develer.com/)
30 * Copyright 1999, 2000, 2001, 2003 Bernie Innocenti <bernie@codewiz.org>
34 * \brief Virtual KFile I/O interface.
36 * KFile is a simple, generic interface for file I/O. It uses an
37 * object-oriented model to supply a device-neutral interface to
38 * communicate with drivers.
40 * This module contains only definitions, the instance structure
42 * Each KFile subclass can override one or more methods of the interface,
43 * and can extend the base KFile structure with its own private data.
44 * For instance, a serial driver might implement the KFile interface by
45 * declaring a context structure like this:
48 * typedef struct Serial
50 * // base class instance
53 * // private instance data
54 * FIFOBuffer txfifo, rxfifo;
58 * You should also supply a macro for casting KFile to Serial:
61 * INLINE Serial * SERIAL_CAST(KFile *fd)
63 * ASSERT(fd->_type == KFT_SERIAL);
64 * return (Serial *)fd;
68 * Then you can implement as many interface functions as needed
69 * and leave the rest to NULL.
71 * Example implementation of the close KFile method for Serial:
74 * static int ser_kfile_close(struct KFile *fd)
76 * Serial *fds = SERIAL_CAST(fd);
77 * // [driver specific code here]
82 * The SERIAL_CAST() macro helps ensure that the passed object is
83 * really of type Serial.
85 * The KFile interface does not supply an open function: this is deliberate,
86 * because in embedded systems each device has its own init parameters.
87 * For the same reason, specific device settings like, for example,
88 * the baudrate, are not part of interface and should be handled by the
89 * driver-specific API.
91 * \author Bernie Innocenti <bernie@codewiz.org>
92 * \author Francesco Sacchi <batt@develer.com>
93 * \author Daniele Basile <asterix@develer.com>
95 * $WIZ$ module_name = "kfile"
96 * $WIZ$ module_configuration = "bertos/cfg/cfg_kfile.h"
97 * $WIZ$ module_depends = "timer", "formatwr"
103 #include <cfg/compiler.h>
104 #include <cfg/debug.h>
105 #include <cfg/macros.h>
110 typedef int32_t kfile_off_t; ///< KFile offset type, used by kfile_seek().
113 * Costants for repositioning read/write file offset.
114 * These are needed because on some embedded platforms
115 * ANSI I/O library may not be present.
117 typedef enum KSeekMode
119 KSM_SEEK_SET, ///< Seek from file beginning.
120 KSM_SEEK_CUR, ///< Seek from file current position.
121 KSM_SEEK_END, ///< Seek from file end.
125 * Prototypes for KFile access functions.
126 * I/O file functions must be ANSI compliant.
127 * \note A KFile user can choose which function subset to implement,
128 * but has to set to NULL unimplemented features.
133 * \return the number of bytes read.
135 typedef size_t (*ReadFunc_t) (struct KFile *fd, void *buf, size_t size);
139 * \return the number of bytes written.
141 typedef size_t (*WriteFunc_t) (struct KFile *fd, const void *buf, size_t size);
144 * Seek into file (if seekable).
145 * \return the new file offset or EOF on errors.
147 typedef kfile_off_t (*SeekFunc_t) (struct KFile *fd, kfile_off_t offset, KSeekMode whence);
150 * Close and reopen file \a fd.
151 * The reopening is done with the former file parameters and access modes.
153 typedef struct KFile * (*ReOpenFunc_t) (struct KFile *fd);
157 * \return 0 on success, EOF on errors.
159 typedef int (*CloseFunc_t) (struct KFile *fd);
163 * \return 0 on success, EOF on errors.
165 typedef int (*FlushFunc_t) (struct KFile *fd);
168 * Get file error mask.
169 * \return 0 on success or file error code, device specific.
171 typedef int (*ErrorFunc_t) (struct KFile *fd);
176 typedef void (*ClearErrFunc_t) (struct KFile *fd);
179 * Context data for callback functions which operate on
182 * \note Remember to add the corresponding accessor functions
183 * when extending this interface.
194 ClearErrFunc_t clearerr;
195 DB(id_t _type); // Used to keep track, at runtime, of the class type.
197 /* NOTE: these must _NOT_ be size_t on 16bit CPUs! */
198 kfile_off_t seek_pos;
203 * Generic implementation of kfile_seek.
205 kfile_off_t kfile_genericSeek(struct KFile *fd, kfile_off_t offset, KSeekMode whence);
208 * Generic implementation of kfile_reopen.
210 struct KFile * kfile_genericReopen(struct KFile *fd);
212 int kfile_genericClose(struct KFile *fd);
214 /** @name KFile access functions
215 * Interface functions for KFile access.
220 * Read \a size bytes from file \a fd into \a buf.
222 * \note This function will block if there are less than \a size bytes
225 * \param fd KFile context.
226 * \param buf User provided buffer.
227 * \param size Number of bytes to read.
228 * \return Number of bytes read.
230 INLINE size_t kfile_read(struct KFile *fd, void *buf, size_t size)
233 return fd->read(fd, buf, size);
235 int kfile_gets(struct KFile *fd, char *buf, int size);
236 int kfile_gets_echo(struct KFile *fd, char *buf, int size, bool echo);
239 * Write \a size bytes from buffer \a buf into KFile \a fd.
241 * Return value may be less than \a size.
243 * \param fd KFile context.
244 * \param buf User provided data.
245 * \param size Number of bytes to write.
246 * \return Number of bytes written.
248 INLINE size_t kfile_write(struct KFile *fd, const void *buf, size_t size)
251 return fd->write(fd, buf, size);
254 int kfile_printf(struct KFile *fd, const char *format, ...);
255 int kfile_print(struct KFile *fd, const char *s);
258 * Seek into file (if seekable).
260 * Move \a fd file seek position of \a offset bytes from \a whence.
262 * \param fd KFile context.
263 * \param offset Offset bytes to move from position \a whence.
264 * \param whence Position where to start the seek.
265 * \return Current postion in the file.
267 INLINE kfile_off_t kfile_seek(struct KFile *fd, kfile_off_t offset, KSeekMode whence)
270 return fd->seek(fd, offset, whence);
274 * Close and reopen file \a fd.
275 * The reopening is done with the former file parameters and access modes.
277 INLINE KFile * kfile_reopen(struct KFile *fd)
280 return fd->reopen(fd);
285 * \return 0 on success, EOF on errors.
287 INLINE int kfile_close(struct KFile *fd)
290 return fd->close(fd);
295 * \return 0 on success, EOF on errors.
297 INLINE int kfile_flush(struct KFile *fd)
300 return fd->flush(fd);
304 * Get file error mask.
305 * \return 0 on success or file error code, device specific.
307 INLINE int kfile_error(struct KFile *fd)
310 return fd->error(fd);
316 INLINE void kfile_clearerr(struct KFile *fd)
318 ASSERT(fd->clearerr);
322 int kfile_putc(int c, struct KFile *fd); ///< Generic putc implementation using kfile_write.
323 int kfile_getc(struct KFile *fd); ///< Generic getc implementation using kfile_read.
324 void kfile_resync(KFile *fd, mtime_t delay);
325 void kfile_init(struct KFile *fd);
329 * Kfile test function.
331 int kfile_testSetup(void);
332 int kfile_testRun(void);
333 int kfile_testRunGeneric(KFile *fd, uint8_t *test_buf, uint8_t *save_buf, size_t size);
334 int kfile_testTearDown(void);
337 #endif /* KERN_KFILE_H */