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
|
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <dirent.h>
#include <limits.h>
#include <sys/stat.h>
#include <sys/types.h>
#define OPT_RECURSIVE 1
#define OPT_FORCE 2
static int usage()
{
fprintf(stderr,"Usage: rm [-rR] [-f] <target>\n");
return -1;
}
/* return -1 on failure, with errno set to the first error */
static int unlink_recursive(const char* name, int flags)
{
struct stat st;
DIR *dir;
struct dirent *de;
int fail = 0;
/* is it a file or directory? */
if (lstat(name, &st) < 0)
return ((flags & OPT_FORCE) && errno == ENOENT) ? 0 : -1;
/* a file, so unlink it */
if (!S_ISDIR(st.st_mode))
return unlink(name);
/* a directory, so open handle */
dir = opendir(name);
if (dir == NULL)
return -1;
/* recurse over components */
errno = 0;
while ((de = readdir(dir)) != NULL) {
char dn[PATH_MAX];
if (!strcmp(de->d_name, "..") || !strcmp(de->d_name, "."))
continue;
sprintf(dn, "%s/%s", name, de->d_name);
if (unlink_recursive(dn, flags) < 0) {
if (!(flags & OPT_FORCE)) {
fail = 1;
break;
}
}
errno = 0;
}
/* in case readdir or unlink_recursive failed */
if (fail || errno < 0) {
int save = errno;
closedir(dir);
errno = save;
return -1;
}
/* close directory handle */
if (closedir(dir) < 0)
return -1;
/* delete target directory */
return rmdir(name);
}
int rm_main(int argc, char *argv[])
{
int ret;
int i, c;
int flags = 0;
int something_failed = 0;
if (argc < 2)
return usage();
/* check flags */
do {
c = getopt(argc, argv, "frR");
if (c == EOF)
break;
switch (c) {
case 'f':
flags |= OPT_FORCE;
break;
case 'r':
case 'R':
flags |= OPT_RECURSIVE;
break;
}
} while (1);
if (optind < 1 || optind >= argc) {
usage();
return -1;
}
/* loop over the file/directory args */
for (i = optind; i < argc; i++) {
if (flags & OPT_RECURSIVE) {
ret = unlink_recursive(argv[i], flags);
} else {
ret = unlink(argv[i]);
if (ret < 0 && errno == ENOENT && (flags & OPT_FORCE)) {
continue;
}
}
if (ret < 0) {
fprintf(stderr, "rm failed for %s, %s\n", argv[i], strerror(errno));
if (!(flags & OPT_FORCE)) {
return -1;
} else {
something_failed = 1;
}
}
}
return something_failed;
}
|
