builtins_more.c

#include "shell.h"
/**
 * builtin_exit - exit of the program with the status
 * @data: struct for the program's data
 * Return: zero if sucess, or other number if its declared in the arguments
 */
int builtin_exit(data_of_program *data)
{
int i;
if (data->tokens[1] != NULL)
{/*if exists arg for exit, check if is a number*/
for (i = 0; data->tokens[1][i]; i++)
if ((data->tokens[1][i] < '0' || data->tokens[1][i] > '9')
&& data->tokens[1][i] != '+')
{/*if is not a number*/
errno = 2;
return (2);
}
errno = _atoi(data->tokens[1]);
}
free_all_data(data);
exit(errno);
}
/**
 * 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++)
{
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);
}
/**
 * builtin_alias - add, remove or show aliases
 * @data: struct for the program's data
 * Return: zero if sucess, or other number if its declared in the arguments
 */
int builtin_alias(data_of_program *data)
{
int i = 0;
/* if there are no arguments, print all environment */
if (data->tokens[1] == NULL)
return (print_alias(data, NULL));
while (data->tokens[++i])
{/* if there are arguments, set or print each env variable*/
if (count_characters(data->tokens[i], "="))
set_alias(data->tokens[i], data);
else
print_alias(data, data->tokens[i]);
}
return (0);
}