1 /* pwd.c - Print working directory.
2 *
3 * Copyright 2006 Rob Landley <rob@landley.net>
4 *
5 * See http://opengroup.org/onlinepubs/9699919799/utilities/pwd.html
6
7 USE_PWD(NEWTOY(pwd, ">0LP[-LP]", TOYFLAG_BIN))
8
9 config PWD
10 bool "pwd"
11 default y
12 help
13 usage: pwd [-L|-P]
14
15 Print working (current) directory.
16
17 -L Use shell's path from $PWD (when applicable)
18 -P Print canonical absolute path
19 */
20
21 #define FOR_pwd
22 #include "toys.h"
23
pwd_main(void)24 void pwd_main(void)
25 {
26 char *s, *pwd = getcwd(0, 0), *PWD;
27
28 // Only use $PWD if it's an absolute path alias for cwd with no "." or ".."
29 if (!(toys.optflags & FLAG_P) && (s = PWD = getenv("PWD"))) {
30 struct stat st1, st2;
31
32 while (*s == '/') {
33 if (*(++s) == '.') {
34 if (s[1] == '/' || !s[1]) break;
35 if (s[1] == '.' && (s[2] == '/' || !s[2])) break;
36 }
37 while (*s && *s != '/') s++;
38 }
39 if (!*s && s != PWD) s = PWD;
40 else s = NULL;
41
42 // If current directory exists, make sure it matches.
43 if (s && pwd)
44 if (stat(pwd, &st1) || stat(PWD, &st2) || st1.st_ino != st2.st_ino ||
45 st1.st_dev != st2.st_dev) s = NULL;
46 } else s = NULL;
47
48 // If -L didn't give us a valid path, use cwd.
49 if (!s && !(s = pwd)) perror_exit("xgetcwd");
50
51 xprintf("%s\n", s);
52
53 if (CFG_TOYBOX_FREE) free(pwd);
54 }
55