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
143
144
145
146
147
|
/* vi: set sw=4 ts=4: */
/*
* Utility routines.
*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include "libbb.h"
#undef DEBUG_RECURS_ACTION
/*
* Walk down all the directories under the specified
* location, and do something (something specified
* by the fileAction and dirAction function pointers).
*
* Unfortunately, while nftw(3) could replace this and reduce
* code size a bit, nftw() wasn't supported before GNU libc 2.1,
* and so isn't sufficiently portable to take over since glibc2.1
* is so stinking huge.
*/
static int FAST_FUNC true_action(const char *fileName UNUSED_PARAM,
struct stat *statbuf UNUSED_PARAM,
void* userData UNUSED_PARAM,
int depth UNUSED_PARAM)
{
return TRUE;
}
/* fileAction return value of 0 on any file in directory will make
* recursive_action() return 0, but it doesn't stop directory traversal
* (fileAction/dirAction will be called on each file).
*
* If !ACTION_RECURSE, dirAction is called on the directory and its
* return value is returned from recursive_action(). No recursion.
*
* If ACTION_RECURSE, recursive_action() is called on each directory.
* If any one of these calls returns 0, current recursive_action() returns 0.
*
* If ACTION_DEPTHFIRST, dirAction is called after recurse.
* If it returns 0, the warning is printed and recursive_action() returns 0.
*
* If !ACTION_DEPTHFIRST, dirAction is called before we recurse.
* Return value of 0 (FALSE) or 2 (SKIP) prevents recursion
* into that directory, instead recursive_action() returns 0 (if FALSE)
* or 1 (if SKIP)
*
* followLinks=0/1 differs mainly in handling of links to dirs.
* 0: lstat(statbuf). Calls fileAction on link name even if points to dir.
* 1: stat(statbuf). Calls dirAction and optionally recurse on link to dir.
*/
int FAST_FUNC recursive_action(const char *fileName,
unsigned flags,
int FAST_FUNC (*fileAction)(const char *fileName, struct stat *statbuf, void* userData, int depth),
int FAST_FUNC (*dirAction)(const char *fileName, struct stat *statbuf, void* userData, int depth),
void* userData,
unsigned depth)
{
struct stat statbuf;
int status;
DIR *dir;
struct dirent *next;
if (!fileAction) fileAction = true_action;
if (!dirAction) dirAction = true_action;
status = ACTION_FOLLOWLINKS; /* hijack a variable for bitmask... */
if (!depth)
status = ACTION_FOLLOWLINKS | ACTION_FOLLOWLINKS_L0;
status = ((flags & status) ? stat : lstat)(fileName, &statbuf);
if (status < 0) {
#ifdef DEBUG_RECURS_ACTION
bb_error_msg("status=%d flags=%x", status, flags);
#endif
goto done_nak_warn;
}
/* If S_ISLNK(m), then we know that !S_ISDIR(m).
* Then we can skip checking first part: if it is true, then
* (!dir) is also true! */
if ( /* (!(flags & ACTION_FOLLOWLINKS) && S_ISLNK(statbuf.st_mode)) || */
!S_ISDIR(statbuf.st_mode)
) {
return fileAction(fileName, &statbuf, userData, depth);
}
/* It's a directory (or a link to one, and followLinks is set) */
if (!(flags & ACTION_RECURSE)) {
return dirAction(fileName, &statbuf, userData, depth);
}
if (!(flags & ACTION_DEPTHFIRST)) {
status = dirAction(fileName, &statbuf, userData, depth);
if (!status)
goto done_nak_warn;
if (status == SKIP)
return TRUE;
}
dir = opendir(fileName);
if (!dir) {
/* findutils-4.1.20 reports this */
/* (i.e. it doesn't silently return with exit code 1) */
/* To trigger: "find -exec rm -rf {} \;" */
goto done_nak_warn;
}
status = TRUE;
while ((next = readdir(dir)) != NULL) {
char *nextFile;
nextFile = concat_subpath_file(fileName, next->d_name);
if (nextFile == NULL)
continue;
/* process every file (NB: ACTION_RECURSE is set in flags) */
if (!recursive_action(nextFile, flags, fileAction, dirAction,
userData, depth + 1))
status = FALSE;
// s = recursive_action(nextFile, flags, fileAction, dirAction,
// userData, depth + 1);
free(nextFile);
//#define RECURSE_RESULT_ABORT 3
// if (s == RECURSE_RESULT_ABORT) {
// closedir(dir);
// return s;
// }
// if (s == FALSE)
// status = FALSE;
}
closedir(dir);
if (flags & ACTION_DEPTHFIRST) {
if (!dirAction(fileName, &statbuf, userData, depth))
goto done_nak_warn;
}
return status;
done_nak_warn:
if (!(flags & ACTION_QUIET))
bb_simple_perror_msg(fileName);
return FALSE;
}
|
