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/** @file
function definitions for shell environment functions.
the following includes are required:
//#include <Guid/ShellVariableGuid.h>
//#include <Library/UefiRuntimeServicesTableLib.h>
Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#ifndef _SHELL_ENVIRONMENT_VARIABLE_HEADER_
#define _SHELL_ENVIRONMENT_VARIABLE_HEADER_
typedef struct {
LIST_ENTRY Link;
CHAR16 *Key;
CHAR16 *Val;
UINT32 Atts;
} ENV_VAR_LIST;
//
// The list is used to cache the environment variables.
//
extern ENV_VAR_LIST gShellEnvVarList;
/**
Reports whether an environment variable is Volatile or Non-Volatile.
@param EnvVarName The name of the environment variable in question
@param Volatile Return TRUE if the environment variable is volatile
@retval EFI_SUCCESS The volatile attribute is returned successfully
@retval others Some errors happened.
**/
EFI_STATUS
IsVolatileEnv (
IN CONST CHAR16 *EnvVarName,
OUT BOOLEAN *Volatile
);
/**
Delete a Non-Volatile environment variable.
This will use the Runtime Services call SetVariable to remove a non-volatile variable.
@param EnvVarName The name of the environment variable in question
@retval EFI_SUCCESS The variable was deleted successfully
@retval other An error occurred
@sa SetVariable
**/
#define SHELL_DELETE_ENVIRONMENT_VARIABLE(EnvVarName) \
(gRT->SetVariable((CHAR16*)EnvVarName, \
&gShellVariableGuid, \
0, \
0, \
NULL))
/**
Set a Non-Volatile environment variable.
This will use the Runtime Services call SetVariable to set a non-volatile variable.
@param EnvVarName The name of the environment variable in question
@param BufferSize UINTN size of Buffer
@param Buffer Pointer to value to set variable to
@retval EFI_SUCCESS The variable was changed successfully
@retval other An error occurred
@sa SetVariable
**/
#define SHELL_SET_ENVIRONMENT_VARIABLE_NV(EnvVarName,BufferSize,Buffer) \
(gRT->SetVariable((CHAR16*)EnvVarName, \
&gShellVariableGuid, \
EFI_VARIABLE_NON_VOLATILE|EFI_VARIABLE_BOOTSERVICE_ACCESS, \
BufferSize, \
(VOID*)Buffer))
/**
Get an environment variable.
This will use the Runtime Services call GetVariable to get a variable.
@param EnvVarName The name of the environment variable in question
@param BufferSize Pointer to the UINTN size of Buffer
@param Buffer Pointer buffer to get variable value into
@retval EFI_SUCCESS The variable's value was retrieved successfully
@retval other An error occurred
@sa SetVariable
**/
#define SHELL_GET_ENVIRONMENT_VARIABLE(EnvVarName,BufferSize,Buffer) \
(gRT->GetVariable((CHAR16*)EnvVarName, \
&gShellVariableGuid, \
0, \
BufferSize, \
Buffer))
/**
Get an environment variable.
This will use the Runtime Services call GetVariable to get a variable.
@param EnvVarName The name of the environment variable in question
@param Atts Pointer to the UINT32 for attributes (or NULL)
@param BufferSize Pointer to the UINTN size of Buffer
@param Buffer Pointer buffer to get variable value into
@retval EFI_SUCCESS The variable's value was retrieved successfully
@retval other An error occurred
@sa SetVariable
**/
#define SHELL_GET_ENVIRONMENT_VARIABLE_AND_ATTRIBUTES(EnvVarName,Atts,BufferSize,Buffer) \
(gRT->GetVariable((CHAR16*)EnvVarName, \
&gShellVariableGuid, \
Atts, \
BufferSize, \
Buffer))
/**
Set a Volatile environment variable.
This will use the Runtime Services call SetVariable to set a volatile variable.
@param EnvVarName The name of the environment variable in question
@param BufferSize UINTN size of Buffer
@param Buffer Pointer to value to set variable to
@retval EFI_SUCCESS The variable was changed successfully
@retval other An error occurred
@sa SetVariable
**/
#define SHELL_SET_ENVIRONMENT_VARIABLE_V(EnvVarName,BufferSize,Buffer) \
(gRT->SetVariable((CHAR16*)EnvVarName, \
&gShellVariableGuid, \
EFI_VARIABLE_BOOTSERVICE_ACCESS, \
BufferSize, \
(VOID*)Buffer))
/**
Creates a list of all Shell-Guid-based environment variables.
@param[in, out] List The pointer to pointer to LIST_ENTRY object for
storing this list.
@retval EFI_SUCCESS the list was created successfully.
**/
EFI_STATUS
GetEnvironmentVariableList(
IN OUT LIST_ENTRY *List
);
/**
Sets a list of all Shell-Guid-based environment variables. this will
also eliminate all pre-existing shell environment variables (even if they
are not on the list).
This function will also deallocate the memory from List.
@param[in] List The pointer to LIST_ENTRY from
GetShellEnvVarList().
@retval EFI_SUCCESS The list was Set successfully.
**/
EFI_STATUS
SetEnvironmentVariableList(
IN LIST_ENTRY *List
);
/**
sets all Shell-Guid-based environment variables. this will
also eliminate all pre-existing shell environment variables (even if they
are not on the list).
@param[in] Environment Points to a NULL-terminated array of environment
variables with the format 'x=y', where x is the
environment variable name and y is the value.
@retval EFI_SUCCESS The command executed successfully.
@retval EFI_INVALID_PARAMETER The parameter is invalid.
@retval EFI_OUT_OF_RESOURCES Out of resources.
@sa SetEnvironmentVariableList
**/
EFI_STATUS
SetEnvironmentVariables(
IN CONST CHAR16 **Environment
);
/**
free function for ENV_VAR_LIST objects.
@param[in] List The pointer to pointer to list.
**/
VOID
FreeEnvironmentVariableList(
IN LIST_ENTRY *List
);
/**
Find an environment variable in the gShellEnvVarList.
@param Key The name of the environment variable.
@param Value The value of the environment variable, the buffer
shoule be freed by the caller.
@param ValueSize The size in bytes of the environment variable
including the tailing CHAR_NULL.
@param Atts The attributes of the variable.
@retval EFI_SUCCESS The command executed successfully.
@retval EFI_NOT_FOUND The environment variable is not found in
gShellEnvVarList.
**/
EFI_STATUS
ShellFindEnvVarInList (
IN CONST CHAR16 *Key,
OUT CHAR16 **Value,
OUT UINTN *ValueSize,
OUT UINT32 *Atts OPTIONAL
);
/**
Add an environment variable into gShellEnvVarList.
@param Key The name of the environment variable.
@param Value The value of environment variable.
@param ValueSize The size in bytes of the environment variable
including the tailing CHAR_NULL
@param Atts The attributes of the variable.
@retval EFI_SUCCESS The environment variable was added to list successfully.
@retval others Some errors happened.
**/
EFI_STATUS
ShellAddEnvVarToList (
IN CONST CHAR16 *Key,
IN CONST CHAR16 *Value,
IN UINTN ValueSize,
IN UINT32 Atts
);
/**
Remove a specified environment variable in gShellEnvVarList.
@param Key The name of the environment variable.
@retval EFI_SUCCESS The command executed successfully.
@retval EFI_NOT_FOUND The environment variable is not found in
gShellEnvVarList.
**/
EFI_STATUS
ShellRemvoeEnvVarFromList (
IN CONST CHAR16 *Key
);
/**
Initialize the gShellEnvVarList and cache all Shell-Guid-based environment
variables.
**/
EFI_STATUS
ShellInitEnvVarList (
VOID
);
/**
Destructe the gShellEnvVarList.
**/
VOID
ShellFreeEnvVarList (
VOID
);
#endif //_SHELL_ENVIRONMENT_VARIABLE_HEADER_
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