1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
/* SPDX-License-Identifier: GPL-2.0+ */
/*
* (C) Copyright 2002-2008
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*/
#include <stdint.h>
/*
* Programs using the library must check which API is available,
* that varies depending on the U-Boot version.
* This can be changed in future
*/
#define FW_ENV_API_VERSION 1
struct env_opts {
#ifdef CONFIG_FILE
char *config_file;
#endif
char *lockname;
};
/**
* fw_printenv() - print one or several environment variables
*
* @argc: number of variables names to be printed, prints all if 0
* @argv: array of variable names to be printed, if argc != 0
* @value_only: do not repeat the variable name, print the bare value,
* only one variable allowed with this option, argc must be 1
* @opts: encryption key, configuration file, defaults are used if NULL
*
* Description:
* Uses fw_env_open, fw_getenv
*
* Return:
* 0 on success, -1 on failure (modifies errno)
*/
int fw_printenv(int argc, char *argv[], int value_only, struct env_opts *opts);
/**
* fw_env_set() - adds or removes one variable to the environment
*
* @argc: number of strings in argv, argv[0] is variable name,
* argc==1 means erase variable, argc > 1 means add a variable
* @argv: argv[0] is variable name, argv[1..argc-1] are concatenated separated
* by single blank and set as the new value of the variable
* @opts: how to retrieve environment from flash, defaults are used if NULL
*
* Description:
* Uses fw_env_open, fw_env_write, fw_env_flush
*
* Return:
* 0 on success, -1 on failure (modifies errno)
*
* ERRORS:
* EROFS - some variables ("ethaddr", "serial#") cannot be modified
*/
int fw_env_set(int argc, char *argv[], struct env_opts *opts);
/**
* fw_parse_script() - adds or removes multiple variables with a batch script
*
* @fname: batch script file name
* @opts: encryption key, configuration file, defaults are used if NULL
*
* Description:
* Uses fw_env_open, fw_env_write, fw_env_flush
*
* Return:
* 0 success, -1 on failure (modifies errno)
*
* Script Syntax:
*
* key [ [space]+ value]
*
* lines starting with '#' treated as comment
*
* A variable without value will be deleted. Any number of spaces are allowed
* between key and value. The value starts with the first non-space character
* and ends with newline. No comments allowed on these lines. Spaces inside
* the value are preserved verbatim.
*
* Script Example:
*
* netdev eth0
*
* kernel_addr 400000
*
* foo spaces are copied verbatim
*
* # delete variable bar
*
* bar
*/
int fw_parse_script(char *fname, struct env_opts *opts);
/**
* fw_env_open() - read enviroment from flash into RAM cache
*
* @opts: encryption key, configuration file, defaults are used if NULL
*
* Return:
* 0 on success, -1 on failure (modifies errno)
*/
int fw_env_open(struct env_opts *opts);
/**
* fw_getenv() - lookup variable in the RAM cache
*
* @name: variable to be searched
* Return:
* pointer to start of value, NULL if not found
*/
char *fw_getenv(char *name);
/**
* fw_env_write() - modify a variable held in the RAM cache
*
* @name: variable
* @value: delete variable if NULL, otherwise create or overwrite the variable
*
* This is called in sequence to update the environment in RAM without updating
* the copy in flash after each set
*
* Return:
* 0 on success, -1 on failure (modifies errno)
*
* ERRORS:
* EROFS - some variables ("ethaddr", "serial#") cannot be modified
*/
int fw_env_write(char *name, char *value);
/**
* fw_env_flush - write the environment from RAM cache back to flash
*
* @opts: encryption key, configuration file, defaults are used if NULL
*
* Return:
* 0 on success, -1 on failure (modifies errno)
*/
int fw_env_flush(struct env_opts *opts);
/**
* fw_env_close - free allocated structure and close env
*
* @opts: encryption key, configuration file, defaults are used if NULL
*
* Return:
* 0 on success, -1 on failure (modifies errno)
*/
int fw_env_close(struct env_opts *opts);
/**
* fw_env_version - return the current version of the library
*
* Return:
* version string of the library
*/
char *fw_env_version(void);
unsigned long crc32(unsigned long, const unsigned char *, unsigned);
|
