mirror of
https://github.com/fish-shell/fish-shell
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131 lines
3.3 KiB
C
131 lines
3.3 KiB
C
/** \file env.h
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Prototypes for functions for setting and getting environment variables.
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*/
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#ifndef FISH_ENV_H
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#define FISH_ENV_H
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#include <wchar.h>
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#include "util.h"
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/**
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Flag for local (to the current block) variable
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*/
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#define ENV_LOCAL 1
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/**
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Flag for exported (to commands) variable
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*/
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#define ENV_EXPORT 2
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/**
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Flag for unexported variable
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*/
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#define ENV_UNEXPORT 16
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/**
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Flag for global variable
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*/
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#define ENV_GLOBAL 4
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/**
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Flag for variable update request from the user. All variable
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changes that are made directly by the user, such as those from the
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'set' builtin must have this flag set.
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*/
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#define ENV_USER 8
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/**
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Flag for universal variable
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*/
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#define ENV_UNIVERSAL 32
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/**
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Error code for trying to alter read-only variable
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*/
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#define ENV_PERM 1
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/**
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Initialize environment variable data
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*/
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void env_init();
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/**
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Destroy environment variable data
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*/
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void env_destroy();
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/**
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Set the value of the environment variable whose name matches key to val.
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Memory policy: All keys and values are copied, the parameters can and should be freed by the caller afterwards
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\param key The key
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\param val The value
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\param mode The type of the variable. Can be any combination of ENV_GLOBAL, ENV_LOCAL, ENV_EXPORT and ENV_USER. If mode is zero, the current variable space is searched and the current mode is used. If no current variable with the same name is found, ENV_LOCAL is assumed.
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\returns 0 on suicess or an error code on failiure.
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The current error codes are:
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* ENV_PERM, can only be returned when setting as a user, e.g. ENV_USER is set. This means that the user tried to change a read-only variable.
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*/
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int env_set( const wchar_t *key,
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const wchar_t *val,
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int mode );
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/**
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Return the value of the variable with the specified name. Returns 0
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if the key does not exist. The returned string should not be
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modified or freed. The returned string is only guaranteed to be
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valid until the next call to env_get(), env_set(), env_push() or
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env_pop() takes place.
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*/
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wchar_t *env_get( const wchar_t *key );
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/**
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Returns 1 if the specified key exists. This can't be reliable done
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using env_get, since env_get returns null for 0-element arrays
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\param key The name of the variable to remove
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\param mode the scope to search in. All scopes are searched if unset
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*/
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int env_exist( const wchar_t *key, int mode );
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/**
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Remove environemnt variable
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\param key The name of the variable to remove
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\param mode should be ENV_USER if this is a remove request from the user, 0 otherwise. If this is a user request, read-only variables can not be removed. The mode may also specify the scope of the variable that should be erased.
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\return zero if the variable existed, and non-zero if the variable did not exist
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*/
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int env_remove( const wchar_t *key, int mode );
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/**
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Push the variable stack. Used for implementing local variables for functions and for-loops.
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*/
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void env_push( int new_scope );
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/**
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Pop the variable stack. Used for implementing local variables for functions and for-loops.
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*/
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void env_pop();
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/**
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Returns an array containing all exported variables in a format suitable for execv.
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*/
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char **env_export_arr( int recalc );
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/**
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Insert all variable names into l. These are not copies of the strings and should not be freed after use.
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*/
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void env_get_names( array_list_t *l, int flags );
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#endif
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