builtin_unset.c File Reference

Implements unset: removes env variables. More...

#include "builtins.h"
#include "libft.h"

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Detailed Description

Implements unset: removes env variables.

Definition in file builtin_unset.c.

Functions
static int	is_valid_unset_identifier (char *str)
	Validate an identifier for unset. More...
static void	remove_env_node (t_env **env, char *key)
	Remove an env node by key from the doubly linked list. More...
int	builtin_unset (char **args, t_env **env)
	Implement the unset command. More...

Function Documentation

is_valid_unset_identifier()

static int is_valid_unset_identifier ( char *  str )

static

Validate an identifier for unset.

Must start with alpha or _ followed by alnum or _ only

Parameters

str	String to validate

Returns

1 if valid and 0 if not

Definition at line 24 of file builtin_unset.c.

Referenced by builtin_unset().

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remove_env_node()

static void remove_env_node ( t_env **  env, char *  key  )

static

Remove an env node by key from the doubly linked list.

Finds the node matching the key and unlinks it from the list + frees

Parameters

env
key

Definition at line 50 of file builtin_unset.c.

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

Referenced by builtin_unset().

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builtin_unset()

int builtin_unset	(	char **	args,
		t_env **	env
	)

Implement the unset command.

Remove named variables from environment

• Invalid identifiers are skipped (silently)
• Options (starting with -) return error 2

Parameters

args	NULL terminated arg array with arg[0] = "unset"
env	Pointer to env list head (nodes will be removed)

Returns

0 on success and 2 if an invalid option was given

Definition at line 86 of file builtin_unset.c.

References is_valid_unset_identifier(), and remove_env_node().

Referenced by exec_builtin().

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