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main_for_bultin.c
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main_for_bultin.c
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#include "shell.h"
int (*get_builtins(char *command))(char **args, char **front);
int shell_exit(char **args, char **front);
int shell_cd(char **args, char __attribute__((__unused__)) **front);
int shell_help(char **args, char __attribute__((__unused__)) **front);
/**
* get_builtins - This function matches given cmd with its
* corresponding builtin function.
*
* @command: String to find.
*
* Return: A pointer to the function corresponding the builtin.
*/
int (*get_builtins(char *command))(char **args, char **front)
{
builtin_list funcs[] = {
{ "exit", shell_exit },
{ "env", shell_env },
{ "setenv", shell_setenv },
{ "unsetenv", shell_unsetenv },
{ "cd", shell_cd },
{ "alias", shell_alias },
{ "help", shell_help },
{ NULL, NULL }
};
int i;
for (i = 0; funcs[i].b_node; i++)
{
if (_strcmp(funcs[i].b_node, command) == 0)
break;
}
return (funcs[i].f);
}
/**
* shell_exit - The function to use when exiting the shell.
*
* @args: An array of args to exit value.
* @front: A double pointer to the starting args.
*
* Return: -3 for no arguments, 2 for invalid exit value,
* otherwise exits with the given status value.
*/
int shell_exit(char **args, char **front)
{
unsigned int num = 0, max = 1 << (sizeof(int) * 8 - 1);
int i;
int length_int = 10;
if (args[0])
{
if (args[0][0] == '+')
{
i = 1;
length_int++;
}
for (; args[0][i]; i++)
{
if (i <= length_int && args[0][i] >= '0' && args[0][i] <= '9')
num = (num * 10) + (args[0][i] - '0');
else
return (create_error(--args, 2));
}
}
else
{
return (-3);
}
if (num > max - 1)
return (create_error(--args, 2));
args -= 1;
free_args(args, front);
free_env();
free_alias_list(aliases);
exit(num);
}
/**
* shell_cd - Changes the current directory of the shell process
* @args: An array of arguments
* @front: A double pointer to the starting args
*
* Return: 2 if string given is not a directory
* -1 when there is an error, otherwise - 0
*/
int shell_cd(char **args, char __attribute__((__unused__)) **front)
{
char **dir_info;
char *new_line = "\n";
char *oldpwd = NULL, *pwd = NULL;
struct stat dir;
oldpwd = getcwd(oldpwd, 0);
if (!oldpwd)
return (-1);
if (args[0])
{
if (*(args[0]) == '-' || _strcmp(args[0], "--") == 0)
{
if ((args[0][1] == '-' && args[0][2] == '\0') ||
args[0][1] == '\0')
{
if (_getenv("OLDPWD") != NULL)
(chdir(*_getenv("OLDPWD") + 7));
}
else
{
free(oldpwd);
return (create_error(args, 2));
}
}
else
{
if (stat(args[0], &dir) == 0 && S_ISDIR(dir.st_mode)
&& ((dir.st_mode & S_IXUSR) != 0))
chdir(args[0]);
else
{
free(oldpwd);
return (create_error(args, 2));
}
}
}
else
{
if (_getenv("HOME") != NULL)
chdir(*(_getenv("HOME")) + 5);
}
pwd = getcwd(pwd, 0);
if (!pwd)
return (-1);
dir_info = malloc(sizeof(char *) * 2);
if (!dir_info)
return (-1);
dir_info[0] = "OLDPWD";
dir_info[1] = oldpwd;
if (shell_setenv(dir_info, dir_info) == -1)
return (-1);
dir_info[0] = "PWD";
dir_info[1] = pwd;
if (shell_setenv(dir_info, dir_info) == -1)
return (-1);
if (args[0] && args[0][0] == '-' && args[0][1] != '-')
{
write(STDOUT_FILENO, pwd, _strlen(pwd));
write(STDOUT_FILENO, new_line, 1);
}
free(oldpwd);
free(pwd);
free(dir_info);
return (0);
}
/**
* shell_help - This function displays information about
* shell builtin commands.
*
* @args: An array of arguments.
* @front: A pointer to the starting args.
*
* Return: -1 When there is an error, otherwise - 0.
*/
int shell_help(char **args, char __attribute__((__unused__)) **front)
{
char *name = args[0];
if (!args[0])
helper_all();
else if (_strcmp(args[0], "alias") == 0)
helper_alias();
else if (_strcmp(args[0], "cd") == 0)
helper_cd();
else if (_strcmp(args[0], "exit") == 0)
helper_exit();
else if (_strcmp(args[0], "env") == 0)
helper_env();
else if (_strcmp(args[0], "setenv") == 0)
helper_setenv();
else if (_strcmp(args[0], "unsetenv") == 0)
helper_unsetenv();
else if (_strcmp(args[0], "help") == 0)
helper_help();
else
write(STDERR_FILENO, name, _strlen(name));
return (0);
}