1 /*
2 * Copyright (c) 2003, 2004 Todd C. Miller <Todd.Miller@courtesan.com>
3 *
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 *
16 * Sponsored in part by the Defense Advanced Research Projects
17 * Agency (DARPA) and Air Force Research Laboratory, Air Force
18 * Materiel Command, USAF, under agreement number F39502-99-1-0512.
19 */
20
21 #include <errno.h>
22 #include <fts.h>
23 #include <ftw.h>
24 #include <sys/stat.h>
25 #include <sys/types.h>
26 #include <unistd.h>
27
do_nftw(const char * path,int (* ftw_fn)(const char *,const struct stat *,int),int (* nftw_fn)(const char *,const struct stat *,int,FTW *),int nfds,int nftw_flags)28 static int do_nftw(const char *path,
29 int (*ftw_fn)(const char*, const struct stat*, int),
30 int (*nftw_fn)(const char*, const struct stat*, int, FTW*),
31 int nfds,
32 int nftw_flags) {
33 // TODO: nfds is currently unused.
34 if (nfds < 1) {
35 errno = EINVAL;
36 return -1;
37 }
38
39 // Translate to fts_open options.
40 int fts_options = FTS_LOGICAL | FTS_COMFOLLOW | FTS_NOCHDIR;
41 if (nftw_fn) {
42 fts_options = FTS_COMFOLLOW | ((nftw_flags & FTW_PHYS) ? FTS_PHYSICAL : FTS_LOGICAL);
43 if (!(nftw_flags & FTW_CHDIR)) fts_options |= FTS_NOCHDIR;
44 if (nftw_flags & FTW_MOUNT) fts_options |= FTS_XDEV;
45 }
46 bool postorder = (nftw_flags & FTW_DEPTH) != 0;
47
48 // Call fts_open.
49 char* const paths[2] = { const_cast<char*>(path), nullptr };
50 FTS* fts = fts_open(paths, fts_options, nullptr);
51 if (fts == nullptr) {
52 return -1;
53 }
54
55 // Translate fts_read results into ftw/nftw callbacks.
56 int error = 0;
57 FTSENT* cur;
58 while (error == 0 && (cur = fts_read(fts)) != nullptr) {
59 int fn_flag;
60 switch (cur->fts_info) {
61 case FTS_D:
62 // In the postorder case, we'll translate FTS_DP to FTW_DP later.
63 // In the can't-access case, we'll translate FTS_DNR to FTW_DNR later.
64 if (postorder || access(cur->fts_path, R_OK) == -1) continue;
65 fn_flag = FTW_D;
66 break;
67 case FTS_DNR:
68 fn_flag = FTW_DNR;
69 break;
70 case FTS_DP:
71 if (!postorder) continue;
72 fn_flag = FTW_DP;
73 break;
74 case FTS_F:
75 case FTS_DEFAULT:
76 fn_flag = FTW_F;
77 break;
78 case FTS_NS:
79 case FTS_NSOK:
80 fn_flag = FTW_NS;
81 break;
82 case FTS_SL:
83 fn_flag = FTW_SL;
84 break;
85 case FTS_SLNONE:
86 fn_flag = (nftw_fn != nullptr) ? FTW_SLN : FTW_NS;
87 break;
88 case FTS_DC:
89 errno = ELOOP;
90 error = -1;
91 continue;
92 default:
93 error = -1;
94 continue;
95 }
96
97 // Call the appropriate function.
98 if (nftw_fn != nullptr) {
99 FTW ftw;
100 ftw.base = cur->fts_pathlen - cur->fts_namelen;
101 ftw.level = cur->fts_level;
102 error = nftw_fn(cur->fts_path, cur->fts_statp, fn_flag, &ftw);
103 } else {
104 error = ftw_fn(cur->fts_path, cur->fts_statp, fn_flag);
105 }
106 }
107
108 int saved_errno = errno;
109 if (fts_close(fts) != 0 && error == 0) {
110 error = -1;
111 } else {
112 errno = saved_errno;
113 }
114 return error;
115 }
116
ftw(const char * path,int (* ftw_fn)(const char *,const struct stat *,int),int nfds)117 int ftw(const char* path, int (*ftw_fn)(const char*, const struct stat*, int), int nfds) {
118 return do_nftw(path, ftw_fn, nullptr, nfds, 0);
119 }
120
nftw(const char * path,int (* nftw_fn)(const char *,const struct stat *,int,FTW *),int nfds,int nftw_flags)121 int nftw(const char* path, int (*nftw_fn)(const char*, const struct stat*, int, FTW*),
122 int nfds, int nftw_flags) {
123 return do_nftw(path, nullptr, nftw_fn, nfds, nftw_flags);
124 }
125