1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * Common environment functions
5 * (C) Copyright 2000-2009
6 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
15 * env_get_id() - Gets a sequence number for the environment
17 * This value increments every time the environment changes, so can be used an
18 * an indication of this
20 * @return environment ID
25 * env_init() - Set up the pre-relocation environment
27 * This locates the environment or uses the default if nothing is available.
28 * This must be called before env_get() will work.
30 * @return 0 if OK, -ENODEV if no environment drivers are enabled
35 * env_relocate() - Set up the post-relocation environment
37 * This loads the environment into RAM so that it can be modified. This is
38 * called after relocation, before the environment is used
40 void env_relocate(void);
43 * env_match() - Match a name / name=value pair
45 * This is used prior to relocation for finding envrionment variables
47 * @name: A simple 'name', or a 'name=value' pair.
48 * @index: The environment index for a 'name2=value2' pair.
49 * @return index for the value if the names match, else -1.
51 int env_match(unsigned char *name, int index);
54 * env_get_f() - Look up the value of an environment variable (early)
56 * This function is called from env_get() if the environment has not been
57 * loaded yet (GD_FLG_ENV_READY flag is 0). Some environment locations will
58 * support reading the value (slowly) and some will not.
60 * @varname: Variable to look up
61 * @return value of variable, or NULL if not found
63 int env_get_f(const char *name, char *buf, unsigned int len);
66 * env_complete() - return an auto-complete for environment variables
68 * @var: partial name to auto-complete
69 * @maxv: Maximum number of matches to return
70 * @cmdv: Returns a list of possible matches
71 * @maxsz: Size of buffer to use for matches
72 * @buf: Buffer to use for matches
73 * @dollar_comp: non-zero to wrap each match in ${...}
74 * @return number of matches found (in @cmdv)
76 int env_complete(char *var, int maxv, char *cmdv[], int maxsz, char *buf,