env_operations.c File Reference

Environment queries: searches, gets, and sets variables. More...

#include "env.h"
#include "libft.h"

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Detailed Description

Environment queries: searches, gets, and sets variables.

Definition in file env_operations.c.

Functions
char *	get_env_value (t_env *env_list, char *key)
	Look up an environment variable's value by its key. More...
static int	update_existing_var (t_env *env_list, char *key, char *value)
	Update the value of an existing environment variable. More...
static int	create_new_var (t_env **env_list, char *key, char *value)
	Create a new variable and add it to the list. More...
int	set_env_value (t_env **env_list, char *key, char *value)
	Set or create an environment variable. More...

Function Documentation

get_env_value()

char* get_env_value	(	t_env *	env_list,
		char *	key
	)

Look up an environment variable's value by its key.

Parameters

env_list	List head to search
key	Variable name to find

Returns

Pointer to the value string or NULL if not found

Definition at line 23 of file env_operations.c.

References t_env::key, t_env::next, and t_env::value.

Referenced by ensure_pwd(), expand_tilde(), find_cmd_path(), get_append_value(), get_cd_path(), get_home_path(), handle_shlvl(), and process_dollar().

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update_existing_var()

static int update_existing_var ( t_env *  env_list, char *  key, char *  value  )

static

Update the value of an existing environment variable.

• Search the list for a node matching the key
• If found, replace its value with a duplicate of the new value

Parameters

env_list	List head to search
key	Variable name to match
value	New value to set

Returns

1 if found & updated and 0 if key not found

Definition at line 50 of file env_operations.c.

References t_env::key, t_env::next, and t_env::value.

Referenced by set_env_value().

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create_new_var()

static int create_new_var ( t_env **  env_list, char *  key, char *  value  )

static

Create a new variable and add it to the list.

Creates a node via create_env_node() and adds it to the list (the temporary string is freed after use)

Parameters

env_list	Pointer to list head pointer
key	Variable name
value	Variable value

Returns

1 on success and 0 on allocation failure

Definition at line 83 of file env_operations.c.

References add_env_node(), and create_env_node().

Referenced by set_env_value().

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set_env_value()

int set_env_value	(	t_env **	env_list,
		char *	key,
		char *	value
	)

Set or create an environment variable.

It first tries to update and existing variable, and if the key is not found, it creates a new node and adds it to the list

Parameters

env_list	Pointer to list head pointer
key	Variable name
value	New value

Returns

1 on success and 0 on allocation failure

Definition at line 115 of file env_operations.c.

References create_new_var(), and update_existing_var().

Referenced by ensure_pwd(), export_append(), export_assign(), handle_shlvl(), and update_pwd_vars().

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