fw_env.h
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/* 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);