more_builtin.c

#include "shell.h"

/**
 * builtins_list - search for match and execute the associate builtin
 * @data: struct for the program's data
 * Return: Returns the return of the function executed is there is a match,
 * otherwise returns -1.
 **/
int builtins_list(data_of_program *data)
{
	int iterator;
	builtins options[] = {
		{"exit", builtin_exit},
		{"help", builtin_help},
		{"cd", builtin_cd},
		{"alias", builtin_alias},
		{"env", builtin_env},
		{"setenv", builtin_set_env},
		{"unsetenv", builtin_unset_env},
		{NULL, NULL}
	};

/*walk through the structure*/
	for (iterator = 0; options[iterator].builtin != NULL; iterator++)
	{
/*if there is a match between the given command and a builtin,*/
		if (str_compare(options[iterator].builtin, data->command_name, 0))
		{
/*execute the function, and return the return value of the function*/
			return (options[iterator].function(data));
		}
/*if there is no match return -1 */
	}
	return (-1);
}

/**
 * builtin_cd - change the current directory
 * @data: struct for the program's data
 * Return: zero if sucess, or other number if its declared in the arguments
 */
int builtin_cd(data_of_program *data)
{
	char *dir_home = env_get_key("HOME", data), *dir_old = NULL;
	char old_dir[128] = {0};
	int error_code = 0;

	if (data->tokens[1])
	{
		if (str_compare(data->tokens[1], "-", 0))
		{
			dir_old = env_get_key("OLDPWD", data);
			if (dir_old)
				error_code = set_work_directory(data, dir_old);
			_print(env_get_key("PWD", data));
			_print("\n");

			return (error_code);
		}
		else
		{
			return (set_work_directory(data, data->tokens[1]));
		}
	}
	else
	{
		if (!dir_home)
			dir_home = getcwd(old_dir, 128);

		return (set_work_directory(data, dir_home));
	}
	return (0);
}

/**
 * set_work_directory - set the work directory
 * @data: struct for the program's data
 * @new_dir: path to be set as work directory
 * Return: zero if sucess, or other number if its declared in the arguments
 */
int set_work_directory(data_of_program *data, char *new_dir)
{
	char old_dir[128] = {0};
	int err_code = 0;

	getcwd(old_dir, 128);

	if (!str_compare(old_dir, new_dir, 0))
	{
		err_code = chdir(new_dir);
		if (err_code == -1)
		{
			errno = 2;
			return (3);
		}
		env_set_key("PWD", new_dir, data);
	}
	env_set_key("OLDPWD", old_dir, data);
	return (0);
}

/**
 * builtin_help - shows the environment where the shell runs
 * @data: struct for the program's data
 * Return: zero if sucess, or other number if its declared in the arguments
 */
int builtin_help(data_of_program *data)
{
	int i, length = 0;
	char *mensajes[6] = {NULL};

	mensajes[0] = HELP_MSG;

	/* validate args */
	if (data->tokens[1] == NULL)
	{
		_print(mensajes[0] + 6);
		return (1);
	}
	if (data->tokens[2] != NULL)
	{
		errno = E2BIG;
		perror(data->command_name);
		return (5);
	}
	mensajes[1] = HELP_EXIT_MSG;
	mensajes[2] = HELP_ENV_MSG;
	mensajes[3] = HELP_SETENV_MSG;
	mensajes[4] = HELP_UNSETENV_MSG;
	mensajes[5] = HELP_CD_MSG;

	for (i = 0; mensajes[i]; i++)
	{
		/*print the length of string */
		length = str_length(data->tokens[1]);
		if (str_compare(data->tokens[1], mensajes[i], length))
		{
			_print(mensajes[i] + length + 1);
			return (1);
		}
	}
	/*if there is no match, print error and return -1 */
	errno = EINVAL;
	perror(data->command_name);
	return (0);
}