io_manager.c revision 65f0aab98b20b5994a726ab90d355248bcddfffd 
1/*
2 * io_manager.c --- the I/O manager abstraction
3 */
4
5#include <stdio.h>
6#include <string.h>
7#if HAVE_UNISTD_H
8#include <unistd.h>
9#endif
10#include <fcntl.h>
11#include <time.h>
12#if HAVE_SYS_STAT_H
13#include <sys/stat.h>
14#endif
15#if HAVE_SYS_TYPES_H
16#include <sys/types.h>
17#endif
18
19#include "ext2_fs.h"
20#include "ext2fs.h"
21
22errcode_t io_channel_set_options(io_channel channel, const char *opts)
23{
24	errcode_t retval = 0;
25	char *next, *ptr, *options, *arg;
26
27	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
28
29	if (!opts)
30		return 0;
31
32	if (!channel->manager->set_option)
33		return EXT2_ET_INVALID_ARGUMENT;
34
35	options = malloc(strlen(opts)+1);
36	if (!options)
37		return EXT2_ET_NO_MEMORY;
38	strcpy(options, opts);
39	ptr = options;
40
41	while (ptr && *ptr) {
42		next = strchr(ptr, '&');
43		if (next)
44			*next++ = 0;
45
46		arg = strchr(ptr, '=');
47		if (arg)
48			*arg++ = 0;
49
50		retval = (channel->manager->set_option)(channel, ptr, arg);
51		if (retval)
52			break;
53		ptr = next;
54	}
55	free(options);
56	return retval;
57}
58
59errcode_t io_channel_write_byte(io_channel channel, unsigned long offset,
60				int count, const void *data)
61{
62	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
63
64	if (channel->manager->write_byte)
65		return channel->manager->write_byte(channel, offset,
66						    count, data);
67
68	return EXT2_ET_UNIMPLEMENTED;
69}
70
71errcode_t io_channel_read_blk64(io_channel channel, unsigned long long block,
72				 int count, void *data)
73{
74	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
75
76	if (channel->manager->read_blk64)
77		return (channel->manager->read_blk64)(channel, block,
78						      count, data);
79
80	if ((block >> 32) != 0)
81		return EXT2_ET_IO_CHANNEL_NO_SUPPORT_64;
82
83	return (channel->manager->read_blk)(channel, (unsigned long) block,
84					     count, data);
85}
86
87errcode_t io_channel_write_blk64(io_channel channel, unsigned long long block,
88				 int count, const void *data)
89{
90	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
91
92	if (channel->manager->write_blk64)
93		return (channel->manager->write_blk64)(channel, block,
94						       count, data);
95
96	if ((block >> 32) != 0)
97		return EXT2_ET_IO_CHANNEL_NO_SUPPORT_64;
98
99	return (channel->manager->write_blk)(channel, (unsigned long) block,
100					     count, data);
101}
102