1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
| | #include <ftw.h>
#include <dirent.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <limits.h>
#include <pthread.h>
struct history
{
struct history *chain;
dev_t dev;
ino_t ino;
int level;
int base;
};
#undef dirfd
#define dirfd(d) (*(int *)d)
static int do_nftw(char *path, int (*fn)(const char *, const struct stat *, int, struct FTW *), int fd_limit, int flags, struct history *h)
{
size_t l = strlen(path), j = l && path[l-1]=='/' ? l-1 : l;
struct stat st;
struct history new;
int type;
int r;
int dfd;
int err;
struct FTW lev;
if ((flags & FTW_PHYS) ? lstat(path, &st) : stat(path, &st) < 0) {
if (!(flags & FTW_PHYS) && errno==ENOENT && !lstat(path, &st))
type = FTW_SLN;
else if (errno != EACCES) return -1;
else type = FTW_NS;
} else if (S_ISDIR(st.st_mode)) {
if (flags & FTW_DEPTH) type = FTW_DP;
else type = FTW_D;
} else if (S_ISLNK(st.st_mode)) {
if (flags & FTW_PHYS) type = FTW_SL;
else type = FTW_SLN;
} else {
type = FTW_F;
}
if ((flags & FTW_MOUNT) && h && st.st_dev != h->dev)
return 0;
new.chain = h;
new.dev = st.st_dev;
new.ino = st.st_ino;
new.level = h ? h->level+1 : 0;
new.base = j+1;
lev.level = new.level;
if (h) {
lev.base = h->base;
} else {
size_t k;
for (k=j; k && path[k]=='/'; k--);
for (; k && path[k-1]!='/'; k--);
lev.base = k;
}
if (type == FTW_D || type == FTW_DP) {
dfd = open(path, O_RDONLY);
err = errno;
if (dfd < 0 && err == EACCES) type = FTW_DNR;
if (!fd_limit) close(dfd);
}
if (!(flags & FTW_DEPTH) && (r=fn(path, &st, type, &lev)))
return r;
for (; h; h = h->chain)
if (h->dev == st.st_dev && h->ino == st.st_ino)
return 0;
if ((type == FTW_D || type == FTW_DP) && fd_limit) {
if (dfd < 0) {
errno = err;
return -1;
}
DIR *d = fdopendir(dfd);
if (d) {
struct dirent *de;
while ((de = readdir(d))) {
if (de->d_name[0] == '.'
&& (!de->d_name[1]
|| (de->d_name[1]=='.'
&& !de->d_name[2]))) continue;
if (strlen(de->d_name) >= PATH_MAX-l) {
closedir(d);
errno = ENAMETOOLONG;
return -1;
}
path[j]='/';
strcpy(path+j+1, de->d_name);
if ((r=do_nftw(path, fn, fd_limit-1, flags, &new))) {
closedir(d);
return r;
}
}
closedir(d);
} else {
close(dfd);
return -1;
}
}
path[l] = 0;
if ((flags & FTW_DEPTH) && (r=fn(path, &st, type, &lev)))
return r;
return 0;
}
int nftw(const char *path, int (*fn)(const char *, const struct stat *, int, struct FTW *), int fd_limit, int flags)
{
int r, cs;
size_t l;
char pathbuf[PATH_MAX+1];
if (fd_limit <= 0) return 0;
l = strlen(path);
if (l > PATH_MAX) {
errno = ENAMETOOLONG;
return -1;
}
memcpy(pathbuf, path, l+1);
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
r = do_nftw(pathbuf, fn, fd_limit, flags, NULL);
pthread_setcancelstate(cs, 0);
return r;
}
weak_alias(nftw, nftw64);
|