Commit | Line | Data |
---|---|---|
8dbf4a5b KT |
1 | /* |
2 | * mv file1 file2 | |
3 | */ | |
4 | ||
5 | #include <stdio.h> | |
6 | #include <sys/types.h> | |
7 | #include <sys/stat.h> | |
8 | #include <sys/dir.h> | |
9 | #include <signal.h> | |
10 | ||
11 | #define DOT "." | |
12 | #define DOTDOT ".." | |
13 | #define DELIM '/' | |
14 | #define SDELIM "/" | |
15 | #define MAXN 100 | |
16 | #define MODEBITS 07777 | |
17 | #define ROOTINO 2 | |
18 | ||
19 | char *pname(); | |
20 | char *sprintf(); | |
21 | char *dname(); | |
22 | struct stat s1, s2; | |
23 | ||
24 | main(argc, argv) | |
25 | register char *argv[]; | |
26 | { | |
27 | register i, r; | |
28 | ||
29 | if (argc < 3) | |
30 | goto usage; | |
31 | if (stat(argv[1], &s1) < 0) { | |
32 | fprintf(stderr, "mv: cannot access %s\n", argv[1]); | |
33 | return(1); | |
34 | } | |
35 | if ((s1.st_mode & S_IFMT) == S_IFDIR) { | |
36 | if (argc != 3) | |
37 | goto usage; | |
38 | return mvdir(argv[1], argv[2]); | |
39 | } | |
40 | setuid(getuid()); | |
41 | if (argc > 3) | |
42 | if (stat(argv[argc-1], &s2) < 0 || (s2.st_mode & S_IFMT) != S_IFDIR) | |
43 | goto usage; | |
44 | r = 0; | |
45 | for (i=1; i<argc-1; i++) | |
46 | r |= move(argv[i], argv[argc-1]); | |
47 | return(r); | |
48 | usage: | |
49 | fprintf(stderr, "usage: mv f1 f2; or mv d1 d2; or mv f1 ... fn d1\n"); | |
50 | return(1); | |
51 | } | |
52 | ||
53 | move(source, target) | |
54 | char *source, *target; | |
55 | { | |
56 | register c, i; | |
57 | int status; | |
58 | char buf[MAXN]; | |
59 | ||
60 | if (stat(source, &s1) < 0) { | |
61 | fprintf(stderr, "mv: cannot access %s\n", source); | |
62 | return(1); | |
63 | } | |
64 | if ((s1.st_mode & S_IFMT) == S_IFDIR) { | |
65 | fprintf(stderr, "mv: directory rename only\n"); | |
66 | return(1); | |
67 | } | |
68 | if (stat(target, &s2) >= 0) { | |
69 | if ((s2.st_mode & S_IFMT) == S_IFDIR) { | |
70 | sprintf(buf, "%s/%s", target, dname(source)); | |
71 | target = buf; | |
72 | } | |
73 | if (stat(target, &s2) >= 0) { | |
74 | if ((s2.st_mode & S_IFMT) == S_IFDIR) { | |
75 | fprintf(stderr, "mv: %s is a directory\n", target); | |
76 | return(1); | |
77 | } | |
78 | if (s1.st_dev==s2.st_dev && s1.st_ino==s2.st_ino) { | |
79 | fprintf(stderr, "mv: %s and %s are identical\n", | |
80 | source, target); | |
81 | return(1); | |
82 | } | |
83 | if (access(target, 2) < 0 && isatty(fileno(stdin))) { | |
84 | fprintf(stderr, "mv: %s: %o mode ", target, | |
85 | s2.st_mode & MODEBITS); | |
86 | i = c = getchar(); | |
87 | while (c != '\n' && c != EOF) | |
88 | c = getchar(); | |
89 | if (i != 'y') | |
90 | return(1); | |
91 | } | |
92 | if (unlink(target) < 0) { | |
93 | fprintf(stderr, "mv: cannot unlink %s\n", target); | |
94 | return(1); | |
95 | } | |
96 | } | |
97 | } | |
98 | if (link(source, target) < 0) { | |
99 | i = fork(); | |
100 | if (i == -1) { | |
101 | fprintf(stderr, "mv: try again\n"); | |
102 | return(1); | |
103 | } | |
104 | if (i == 0) { | |
105 | execl("/bin/cp", "cp", source, target, 0); | |
106 | fprintf(stderr, "mv: cannot exec cp\n"); | |
107 | exit(1); | |
108 | } | |
109 | while ((c = wait(&status)) != i && c != -1) | |
110 | ; | |
111 | if (status != 0) | |
112 | return(1); | |
113 | utime(target, &s1.st_atime); | |
114 | } | |
115 | if (unlink(source) < 0) { | |
116 | fprintf(stderr, "mv: cannot unlink %s\n", source); | |
117 | return(1); | |
118 | } | |
119 | return(0); | |
120 | } | |
121 | ||
122 | mvdir(source, target) | |
123 | char *source, *target; | |
124 | { | |
125 | register char *p; | |
126 | register i; | |
127 | char buf[MAXN]; | |
128 | ||
129 | if (stat(target, &s2) >= 0) { | |
130 | if ((s2.st_mode&S_IFMT) != S_IFDIR) { | |
131 | fprintf(stderr, "mv: %s exists\n", target); | |
132 | return(1); | |
133 | } | |
134 | if (strlen(target) > MAXN-DIRSIZ-2) { | |
135 | fprintf(stderr, "mv :target name too long\n"); | |
136 | return(1); | |
137 | } | |
138 | strcpy(buf, target); | |
139 | target = buf; | |
140 | strcat(buf, SDELIM); | |
141 | strcat(buf, dname(source)); | |
142 | if (stat(target, &s2) >= 0) { | |
143 | fprintf(stderr, "mv: %s exists\n", buf); | |
144 | return(1); | |
145 | } | |
146 | } | |
147 | if (strcmp(source, target) == 0) { | |
148 | fprintf(stderr, "mv: ?? source == target, source exists and target doesnt\n"); | |
149 | return(1); | |
150 | } | |
151 | p = dname(source); | |
152 | if (!strcmp(p, DOT) || !strcmp(p, DOTDOT) || !strcmp(p, "") || p[strlen(p)-1]=='/') { | |
153 | fprintf(stderr, "mv: cannot rename %s\n", p); | |
154 | return(1); | |
155 | } | |
156 | if (stat(pname(source), &s1) < 0 || stat(pname(target), &s2) < 0) { | |
157 | fprintf(stderr, "mv: cannot locate parent\n"); | |
158 | return(1); | |
159 | } | |
160 | if (access(pname(target), 2) < 0) { | |
161 | fprintf(stderr, "mv: no write access to %s\n", pname(target)); | |
162 | return(1); | |
163 | } | |
164 | if (access(pname(source), 2) < 0) { | |
165 | fprintf(stderr, "mv: no write access to %s\n", pname(source)); | |
166 | return(1); | |
167 | } | |
168 | if (access(source, 2) < 0) { | |
169 | fprintf(stderr, "mv: no write access to %s\n", source); | |
170 | return(1); | |
171 | } | |
172 | if (s1.st_dev != s2.st_dev) { | |
173 | fprintf(stderr, "mv: cannot move directories across devices\n"); | |
174 | return(1); | |
175 | } | |
176 | if (s1.st_ino != s2.st_ino) { | |
177 | char dst[MAXN+5]; | |
178 | ||
179 | if (chkdot(source) || chkdot(target)) { | |
180 | fprintf(stderr, "mv: Sorry, path names including %s aren't allowed\n", DOTDOT); | |
181 | return(1); | |
182 | } | |
183 | stat(source, &s1); | |
184 | if (check(pname(target), s1.st_ino)) | |
185 | return(1); | |
186 | for (i = 1; i <= NSIG; i++) | |
187 | signal(i, SIG_IGN); | |
188 | if (link(source, target) < 0) { | |
189 | fprintf(stderr, "mv: cannot link %s to %s\n", target, source); | |
190 | return(1); | |
191 | } | |
192 | if (unlink(source) < 0) { | |
193 | fprintf(stderr, "mv: %s: cannot unlink\n", source); | |
194 | unlink(target); | |
195 | return(1); | |
196 | } | |
197 | strcat(dst, target); | |
198 | strcat(dst, "/"); | |
199 | strcat(dst, DOTDOT); | |
200 | if (unlink(dst) < 0) { | |
201 | fprintf(stderr, "mv: %s: cannot unlink\n", dst); | |
202 | if (link(target, source) >= 0) | |
203 | unlink(target); | |
204 | return(1); | |
205 | } | |
206 | if (link(pname(target), dst) < 0) { | |
207 | fprintf(stderr, "mv: cannot link %s to %s\n", | |
208 | dst, pname(target)); | |
209 | if (link(pname(source), dst) >= 0) | |
210 | if (link(target, source) >= 0) | |
211 | unlink(target); | |
212 | return(1); | |
213 | } | |
214 | return(0); | |
215 | } | |
216 | if (link(source, target) < 0) { | |
217 | fprintf(stderr, "mv: cannot link %s and %s\n", | |
218 | source, target); | |
219 | return(1); | |
220 | } | |
221 | if (unlink(source) < 0) { | |
222 | fprintf(stderr, "mv: ?? cannot unlink %s\n", source); | |
223 | return(1); | |
224 | } | |
225 | return(0); | |
226 | } | |
227 | ||
228 | char * | |
229 | pname(name) | |
230 | register char *name; | |
231 | { | |
232 | register c; | |
233 | register char *p, *q; | |
234 | static char buf[MAXN]; | |
235 | ||
236 | p = q = buf; | |
237 | while (c = *p++ = *name++) | |
238 | if (c == DELIM) | |
239 | q = p-1; | |
240 | if (q == buf && *q == DELIM) | |
241 | q++; | |
242 | *q = 0; | |
243 | return buf[0]? buf : DOT; | |
244 | } | |
245 | ||
246 | char * | |
247 | dname(name) | |
248 | register char *name; | |
249 | { | |
250 | register char *p; | |
251 | ||
252 | p = name; | |
253 | while (*p) | |
254 | if (*p++ == DELIM && *p) | |
255 | name = p; | |
256 | return name; | |
257 | } | |
258 | ||
259 | check(spth, dinode) | |
260 | char *spth; | |
261 | ino_t dinode; | |
262 | { | |
263 | char nspth[MAXN]; | |
264 | struct stat sbuf; | |
265 | ||
266 | sbuf.st_ino = 0; | |
267 | ||
268 | strcpy(nspth, spth); | |
269 | while (sbuf.st_ino != ROOTINO) { | |
270 | if (stat(nspth, &sbuf) < 0) { | |
271 | fprintf(stderr, "mv: cannot access %s\n", nspth); | |
272 | return(1); | |
273 | } | |
274 | if (sbuf.st_ino == dinode) { | |
275 | fprintf(stderr, "mv: cannot move a directory into itself\n"); | |
276 | return(1); | |
277 | } | |
278 | if (strlen(nspth) > MAXN-2-sizeof(DOTDOT)) { | |
279 | fprintf(stderr, "mv: name too long\n"); | |
280 | return(1); | |
281 | } | |
282 | strcat(nspth, SDELIM); | |
283 | strcat(nspth, DOTDOT); | |
284 | } | |
285 | return(0); | |
286 | } | |
287 | ||
288 | chkdot(s) | |
289 | register char *s; | |
290 | { | |
291 | do { | |
292 | if (strcmp(dname(s), DOTDOT) == 0) | |
293 | return(1); | |
294 | s = pname(s); | |
295 | } while (strcmp(s, DOT) != 0 && strcmp(s, SDELIM) != 0); | |
296 | return(0); | |
297 | } |