builtin_cd.c File Reference

Implements cd: changes directory and updates OLDPWD/PWD. More...

#include <stdio.h>
#include "builtins.h"
#include "libft.h"
#include "env.h"

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Detailed Description

Implements cd: changes directory and updates OLDPWD/PWD.

Definition in file builtin_cd.c.

Functions
static char *	get_home_path (t_env *env)
	Get the HOME value from environment. More...
static char *	get_cd_path (char **args, t_env *env, int *err)
	Get the target path for cd. More...
static void	update_pwd_vars (t_env **env, char *old_pwd)
	Update OLDPWD and PWD environment variables after cd. More...
int	builtin_cd (char **args, t_env **env)
	Implement the cd command. More...

Function Documentation

get_home_path()

static char* get_home_path ( t_env *  env )

static

Get the HOME value from environment.

Parameters

env	Environment list

Returns

HOME value or NULL with error message

Definition at line 24 of file builtin_cd.c.

References get_env_value().

Referenced by get_cd_path().

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get_cd_path()

static char* get_cd_path ( char **  args, t_env *  env, int *  err  )

static

Get the target path for cd.

Handles no argument or "--" (HOME), "-" (OLDPWD and printed), "-- path" (path) and too many arguments (sets err = 1)

Parameters

args	Arguments array
env	Environment list for HOME and OLDPWD lookup
err	Set to 1 if too many arguments and 0 otherwise

Returns

Target path or NULL on error

Definition at line 45 of file builtin_cd.c.

References get_env_value(), and get_home_path().

Referenced by builtin_cd().

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update_pwd_vars()

static void update_pwd_vars ( t_env **  env, char *  old_pwd  )

static

Update OLDPWD and PWD environment variables after cd.

Parameters

env	Pointer to env list head
old_pwd	Previous working directory (OLDPWD)

Definition at line 78 of file builtin_cd.c.

References set_env_value().

Referenced by builtin_cd().

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builtin_cd()

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

Implement the cd command.

Changes the working directory and supports:

• no args (HOME)
• "-" (OLDPWD)
• "--" separator
• Error on too many arguments

Parameters

args	NULL terminated argument array with arg[0] = "cd"
env	Pointer to env list head

Returns

0 on success, 1 on error

Definition at line 101 of file builtin_cd.c.

References get_cd_path(), and update_pwd_vars().

Referenced by exec_builtin().

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