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fs: fat: simplify gotos from read_bootsectandvi
[thirdparty/u-boot.git] / fs / semihostingfs.c
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f676b451
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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (C) 2022, Sean Anderson <sean.anderson@seco.com>
4 * Copyright (c) 2012, Google Inc.
5 */
6
7#include <common.h>
8#include <fs.h>
9#include <malloc.h>
10#include <os.h>
11#include <semihosting.h>
12#include <semihostingfs.h>
13
14int smh_fs_set_blk_dev(struct blk_desc *rbdd, struct disk_partition *info)
15{
16 /*
17 * Only accept a NULL struct blk_desc for the semihosting, which is when
18 * hostfs interface is used
19 */
20 return !!rbdd;
21}
22
23static int smh_fs_read_at(const char *filename, loff_t pos, void *buffer,
24 loff_t maxsize, loff_t *actread)
25{
26 long fd, size, ret;
27
28 fd = smh_open(filename, MODE_READ | MODE_BINARY);
29 if (fd < 0)
30 return fd;
31 ret = smh_seek(fd, pos);
32 if (ret < 0) {
33 smh_close(fd);
34 return ret;
35 }
36 if (!maxsize) {
37 size = smh_flen(fd);
38 if (ret < 0) {
39 smh_close(fd);
40 return size;
41 }
42
43 maxsize = size;
44 }
45
46 size = smh_read(fd, buffer, maxsize);
47 smh_close(fd);
48 if (size < 0)
49 return size;
50
51 *actread = size;
52 return 0;
53}
54
55static int smh_fs_write_at(const char *filename, loff_t pos, void *buffer,
56 loff_t towrite, loff_t *actwrite)
57{
58 long fd, size, ret;
59
2f9943be 60 /* Try to open existing file */
f676b451 61 fd = smh_open(filename, MODE_READ | MODE_BINARY | MODE_PLUS);
2f9943be
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62 if (fd < 0)
63 /* Create new file */
64 fd = smh_open(filename, MODE_WRITE | MODE_BINARY);
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65 if (fd < 0)
66 return fd;
67 ret = smh_seek(fd, pos);
68 if (ret < 0) {
69 smh_close(fd);
70 return ret;
71 }
72
73 ret = smh_write(fd, buffer, towrite, &size);
74 smh_close(fd);
75 *actwrite = size;
76 return ret;
77}
78
79int smh_fs_size(const char *filename, loff_t *result)
80{
81 long fd, size;
82
83 fd = smh_open(filename, MODE_READ | MODE_BINARY);
84 if (fd < 0)
85 return fd;
86
87 size = smh_flen(fd);
88 smh_close(fd);
89
90 if (size < 0)
91 return size;
92
93 *result = size;
94 return 0;
95}
96
97int smh_fs_read(const char *filename, void *buf, loff_t offset, loff_t len,
98 loff_t *actread)
99{
100 int ret;
101
102 ret = smh_fs_read_at(filename, offset, buf, len, actread);
103 if (ret)
104 printf("** Unable to read file %s **\n", filename);
105
106 return ret;
107}
108
109int smh_fs_write(const char *filename, void *buf, loff_t offset,
110 loff_t len, loff_t *actwrite)
111{
112 int ret;
113
114 ret = smh_fs_write_at(filename, offset, buf, len, actwrite);
115 if (ret)
116 printf("** Unable to write file %s **\n", filename);
117
118 return ret;
119}