1 #include <stdio.h>
2 #include <unistd.h>
3 #include <string.h>
4 #include <errno.h>
5 #include <dirent.h>
6 #include <limits.h>
7 #include <sys/stat.h>
8 #include <sys/types.h>
9
10 #define OPT_RECURSIVE 1
11 #define OPT_FORCE 2
12
usage()13 static int usage()
14 {
15 fprintf(stderr,"Usage: rm [-rR] [-f] <target>\n");
16 return -1;
17 }
18
19 /* return -1 on failure, with errno set to the first error */
unlink_recursive(const char * name,int flags)20 static int unlink_recursive(const char* name, int flags)
21 {
22 struct stat st;
23 DIR *dir;
24 struct dirent *de;
25 int fail = 0;
26
27 /* is it a file or directory? */
28 if (lstat(name, &st) < 0)
29 return ((flags & OPT_FORCE) && errno == ENOENT) ? 0 : -1;
30
31 /* a file, so unlink it */
32 if (!S_ISDIR(st.st_mode))
33 return unlink(name);
34
35 /* a directory, so open handle */
36 dir = opendir(name);
37 if (dir == NULL)
38 return -1;
39
40 /* recurse over components */
41 errno = 0;
42 while ((de = readdir(dir)) != NULL) {
43 char dn[PATH_MAX];
44 if (!strcmp(de->d_name, "..") || !strcmp(de->d_name, "."))
45 continue;
46 sprintf(dn, "%s/%s", name, de->d_name);
47 if (unlink_recursive(dn, flags) < 0) {
48 fail = 1;
49 break;
50 }
51 errno = 0;
52 }
53 /* in case readdir or unlink_recursive failed */
54 if (fail || errno < 0) {
55 int save = errno;
56 closedir(dir);
57 errno = save;
58 return -1;
59 }
60
61 /* close directory handle */
62 if (closedir(dir) < 0)
63 return -1;
64
65 /* delete target directory */
66 return rmdir(name);
67 }
68
rm_main(int argc,char * argv[])69 int rm_main(int argc, char *argv[])
70 {
71 int ret;
72 int i, c;
73 int flags = 0;
74
75 if (argc < 2)
76 return usage();
77
78 /* check flags */
79 do {
80 c = getopt(argc, argv, "frR");
81 if (c == EOF)
82 break;
83 switch (c) {
84 case 'f':
85 flags |= OPT_FORCE;
86 break;
87 case 'r':
88 case 'R':
89 flags |= OPT_RECURSIVE;
90 break;
91 }
92 } while (1);
93
94 if (optind < 1 || optind >= argc) {
95 usage();
96 return -1;
97 }
98
99 /* loop over the file/directory args */
100 for (i = optind; i < argc; i++) {
101
102 if (flags & OPT_RECURSIVE) {
103 ret = unlink_recursive(argv[i], flags);
104 } else {
105 ret = unlink(argv[i]);
106 if (errno == ENOENT && (flags & OPT_FORCE)) {
107 return 0;
108 }
109 }
110
111 if (ret < 0) {
112 fprintf(stderr, "rm failed for %s, %s\n", argv[i], strerror(errno));
113 return -1;
114 }
115 }
116
117 return 0;
118 }
119
120