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**
** Made by Seblu
** Login <seblu@epita.fr>
**
** Started on Tue Apr 11 00:23:47 2006 Seblu
*/
#include <ctype.h>
#include <stdio.h>
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include "../main/42sh.h"
#include "builtin.h"
#include "../var/var.h"
static int cd_var(struct s_42sh *sh, const char *name);
static int cd_minus(struct s_42sh *sh);
static int secure_chdir(const char *path);
/*!
** Builtin cd.
** @param argv The tab of args: terminated by NULL, argv[0] = "cd"
** @param sh The 42sh structure
*/
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{
assert(sh && argv && argv[0]);
if (!argv[1])
return cd_var(sh, "HOME");
if (!strcmp("-", argv[1]))
return cd_minus(sh);
return secure_chdir(argv[1]);
}
/*!
** Change directory to home directory
**
** @param sh shell env
** @param name env var
**
** @return exit status
*/
static int cd_var(struct s_42sh *sh, const char *name)
{
const char *new_dir;
if (!(new_dir = var_get(sh->vars, name)))
{
fprintf(stderr, "42sh: cd: %s not set\n", name);
return 1;
}
return secure_chdir(new_dir);
}
/*!
** Return in previous directory
**
** @param sh shell info
**
** @return return status
*/
static int cd_minus(struct s_42sh *sh)
{
if (cd_var(sh, "OLDPWD"))
return 1;
return 0;
}
/*!
** Change of directory and on error, print good error.
**
** @param path new path
**
** @return error status with error code (0 is good)
*/
static int secure_chdir(const char *path)
{
const char *errormsg = "";
char *tmp;
errno = 0;
if (chdir(path))
{
if (errno == ENOENT)
errormsg = "No such file or directory";
else if (errno == EACCES)
errormsg = "Permission denied";
else if (errno == ENAMETOOLONG)
errormsg = "File name too long";
else if (errno == ENOTDIR)
errormsg = "Not a directory";
else if (errno == ELOOP)
errormsg = "Too many levels of symbolic links";
else
assert(0);
fprintf(stderr, "42sh: cd %s: %s\n", path, errormsg);
return 1;
}
if ((tmp = getenv("PWD")))
var_setenv("OLDPWD", tmp, !0);
var_setenv("PWD", (tmp = var_getcwd()), !0);
free(tmp);
return 0;
}