Commit | Line | Data |
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bb0cfa24 | 1 | /* |
8a4b7e23 KB |
2 | * Copyright (c) 1989 The Regents of the University of California. |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms are permitted | |
6 | * provided that the above copyright notice and this paragraph are | |
7 | * duplicated in all such forms and that any documentation, | |
8 | * advertising materials, and other materials related to such | |
9 | * distribution and use acknowledge that the software was developed | |
10 | * by the University of California, Berkeley. The name of the | |
11 | * University may not be used to endorse or promote products derived | |
12 | * from this software without specific prior written permission. | |
13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
15 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
bb0cfa24 DF |
16 | */ |
17 | ||
2ce81398 | 18 | #if defined(LIBC_SCCS) && !defined(lint) |
1f8e47f9 | 19 | static char sccsid[] = "@(#)getcwd.c 5.6 (Berkeley) %G%"; |
8a4b7e23 | 20 | #endif /* LIBC_SCCS and not lint */ |
9b6e6036 | 21 | |
87dccba9 SL |
22 | #include <sys/param.h> |
23 | #include <sys/stat.h> | |
8a4b7e23 | 24 | #include <dirent.h> |
9b6e6036 SL |
25 | |
26 | char * | |
8a4b7e23 KB |
27 | getwd(store) |
28 | char *store; | |
9b6e6036 | 29 | { |
8a4b7e23 KB |
30 | extern int errno; |
31 | register DIR *dir; | |
32 | register struct dirent *dp; | |
33 | register int first; | |
34 | register char *pp, *pu; | |
35 | struct stat s, tmp; | |
36 | dev_t root_dev; | |
37 | ino_t root_ino; | |
1f8e47f9 MK |
38 | int save_errno, found; |
39 | char path[MAXPATHLEN], up[MAXPATHLEN], *file, *strerror(); | |
9b6e6036 | 40 | |
1f8e47f9 MK |
41 | if (stat("/", &s)) { |
42 | file = "/"; | |
8a4b7e23 | 43 | goto err; |
1f8e47f9 | 44 | } |
8a4b7e23 KB |
45 | root_dev = s.st_dev; |
46 | root_ino = s.st_ino; | |
1f8e47f9 MK |
47 | if (stat(".", &s)) { |
48 | file = "."; | |
8a4b7e23 | 49 | goto err; |
1f8e47f9 | 50 | } |
8a4b7e23 KB |
51 | pp = path + sizeof(path) - 1; |
52 | *pp = '\0'; | |
53 | for (pu = up, first = 1;; first = 0) { | |
54 | if (root_dev == s.st_dev && root_ino == s.st_ino) { | |
55 | *store = '/'; | |
1f8e47f9 MK |
56 | (void) strcpy(store + 1, pp); |
57 | return (store); | |
90432f68 | 58 | } |
8a4b7e23 KB |
59 | *pu++ = '.'; |
60 | *pu++ = '.'; | |
61 | *pu = '\0'; | |
62 | if (!(dir = opendir(up))) { | |
1f8e47f9 MK |
63 | file = up; |
64 | goto err; | |
8a4b7e23 KB |
65 | } |
66 | *pu++ = '/'; | |
1f8e47f9 MK |
67 | found = 0; |
68 | file = NULL; | |
69 | while (errno = 0, dp = readdir(dir)) { | |
70 | if (dp->d_name[0] == '.' && (dp->d_name[1] == '\0' || | |
71 | dp->d_name[1] == '.' && dp->d_name[2] == '\0')) | |
8a4b7e23 KB |
72 | continue; |
73 | bcopy(dp->d_name, pu, dp->d_namlen + 1); | |
1f8e47f9 MK |
74 | if (lstat(up, &tmp)) { |
75 | file = dp->d_name; | |
76 | save_errno = errno; | |
77 | continue; | |
78 | } | |
8a4b7e23 KB |
79 | if (tmp.st_dev == s.st_dev && tmp.st_ino == s.st_ino) { |
80 | if (!first) | |
81 | *--pp = '/'; | |
82 | pp -= dp->d_namlen; | |
83 | bcopy(dp->d_name, pp, dp->d_namlen); | |
1f8e47f9 | 84 | found = 1; |
90432f68 SL |
85 | break; |
86 | } | |
8a4b7e23 | 87 | } |
1f8e47f9 MK |
88 | if (errno) { |
89 | save_errno = errno; | |
90 | file = up; | |
91 | } | |
8a4b7e23 KB |
92 | closedir(dir); |
93 | *pu = '\0'; | |
1f8e47f9 MK |
94 | if (!found) { |
95 | /* | |
96 | * We didn't find the current level in its parent | |
97 | * directory; figure out what to complain about. | |
98 | */ | |
99 | if (file) { | |
100 | errno = save_errno; | |
101 | goto err; | |
102 | } | |
103 | (void) sprintf(store, "%s not found in %s?\n", | |
104 | first ? "." : pp, up); | |
105 | return ((char *)NULL); | |
106 | } | |
107 | ||
108 | /* stat "." at current level, then ascend */ | |
8a4b7e23 | 109 | if (lstat(up, &s)) { |
1f8e47f9 MK |
110 | file = up; |
111 | goto err; | |
8a4b7e23 | 112 | } |
90432f68 | 113 | } |
1f8e47f9 MK |
114 | |
115 | err: | |
116 | (void) sprintf(store, "getwd: %s: %s", file, strerror(errno)); | |
117 | return ((char *)NULL); | |
9b6e6036 | 118 | } |