| 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 | } |