env_init.c File Reference

Initializes env list from envp array. More...

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

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Detailed Description

Initializes env list from envp array.

Definition in file env_init.c.

Functions
t_env *	init_env (char **envp)
	Initialize the environment linked list from main()'s envp. More...
static int	set_env_key_value (t_env *node, char *env_string, char *equal_pos)
	Parse KEY=value and fill a pre allocated t_env node. More...
t_env *	create_env_node (char *env_string)
	Create a single environment node from a KEY=value string. More...
void	add_env_node (t_env **head, t_env *new_node)
	Add a node to the end of the environment linked list. More...

Function Documentation

init_env()

t_env* init_env

(

char **

envp

)

Initialize the environment linked list from main()'s envp.

• Iterate through envp array while creating a t_env node for each entry
• After building the list, increment SHLVL and ensure PWD is set

Parameters

envp	NULL terminated string array from main()

Returns

Head of the newly allocated environment list or NULL if env was empty

Note

On allocation failure in the middle, frees all already created nodes

Warning

The caller must free via free_env_list()

Definition at line 27 of file env_init.c.

References add_env_node(), create_env_node(), ensure_pwd(), free_env_list(), and handle_shlvl().

Referenced by main().

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set_env_key_value()

static int set_env_key_value ( t_env *  node, char *  env_string, char *  equal_pos  )

static

Parse KEY=value and fill a pre allocated t_env node.

• Extract the key (before =) and the value (after =) from env_string
• Store copies in node->key and node->value
• On partial failure free the already allocated key

Parameters

node	Pre allocated node to populate
env_string	Original KEY=value string
equal_pos	Pointer to the = char within env_string

Returns

1 on success and 0 on allocation failure

Definition at line 65 of file env_init.c.

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

Referenced by create_env_node().

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create_env_node()

t_env* create_env_node

(

char *

env_string

)

Create a single environment node from a KEY=value string.

Allocate a t_env_node and populate key/value by splitting at the =

• Strings without = are rejected (return NULL)

Parameters

env_string

KEY=value string

Returns

New node with key and value set or NULL on failure

Definition at line 91 of file env_init.c.

References t_env::next, t_env::prev, and set_env_key_value().

Referenced by create_new_var(), and init_env().

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add_env_node()

void add_env_node	(	t_env **	head,
		t_env *	new_node
	)

Add a node to the end of the environment linked list.

Parameters

head	Pointer to list head pointer
new_node	Node to add

Definition at line 121 of file env_init.c.

References t_env::next, and t_env::prev.

Referenced by create_new_var(), export_no_value(), and init_env().

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