| 1 | static char *sccsid = "@(#)mv.c 4.5 (Berkeley) 82/02/11"; |
| 2 | /* |
| 3 | * mv file1 file2 |
| 4 | */ |
| 5 | |
| 6 | #include <stdio.h> |
| 7 | #include <sys/types.h> |
| 8 | #include <sys/stat.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 | int iflag = 0; /* interactive flag. If this flag is set, |
| 24 | * the user is queried before files are |
| 25 | * destroyed by cp. |
| 26 | */ |
| 27 | int fflag = 0; /* force flag. supercedes all restrictions */ |
| 28 | |
| 29 | main(argc, argv) |
| 30 | register char *argv[]; |
| 31 | { |
| 32 | register i, r; |
| 33 | register char *arg; |
| 34 | |
| 35 | /* get the flag(s) */ |
| 36 | |
| 37 | if (argc < 2) |
| 38 | goto usage; |
| 39 | while (argc>1 && *argv[1] == '-') { |
| 40 | argc--; |
| 41 | arg = *++argv; |
| 42 | |
| 43 | /* |
| 44 | * all files following a null option are considered file names |
| 45 | */ |
| 46 | if (*(arg+1) == '\0') break; |
| 47 | |
| 48 | while (*++arg != '\0') |
| 49 | switch (*arg) { |
| 50 | |
| 51 | /* interactive mode */ |
| 52 | case 'i': |
| 53 | iflag++; |
| 54 | break; |
| 55 | |
| 56 | /* force moves */ |
| 57 | case 'f': |
| 58 | fflag++; |
| 59 | break; |
| 60 | |
| 61 | /* don't live with bad options */ |
| 62 | default: |
| 63 | goto usage; |
| 64 | } |
| 65 | } |
| 66 | if (argc < 3) |
| 67 | goto usage; |
| 68 | if (stat(argv[1], &s1) < 0) { |
| 69 | fprintf(stderr, "mv: cannot access %s\n", argv[1]); |
| 70 | return(1); |
| 71 | } |
| 72 | if ((s1.st_mode & S_IFMT) == S_IFDIR) { |
| 73 | if (argc != 3) |
| 74 | goto usage; |
| 75 | return mvdir(argv[1], argv[2]); |
| 76 | } |
| 77 | setuid(getuid()); |
| 78 | if (argc > 3) |
| 79 | if (stat(argv[argc-1], &s2) < 0 || (s2.st_mode & S_IFMT) != S_IFDIR) |
| 80 | goto usage; |
| 81 | r = 0; |
| 82 | for (i=1; i<argc-1; i++) |
| 83 | r |= move(argv[i], argv[argc-1]); |
| 84 | return(r); |
| 85 | usage: |
| 86 | fprintf(stderr, "usage: mv [-if] f1 f2; or mv [-if] d1 d2; or mv [-if] f1 ... fn d1\n"); |
| 87 | return(1); |
| 88 | } |
| 89 | |
| 90 | move(source, target) |
| 91 | char *source, *target; |
| 92 | { |
| 93 | register c, i; |
| 94 | int status; |
| 95 | char buf[MAXN]; |
| 96 | |
| 97 | if (stat(source, &s1) < 0) { |
| 98 | fprintf(stderr, "mv: cannot access %s\n", source); |
| 99 | return(1); |
| 100 | } |
| 101 | if ((s1.st_mode & S_IFMT) == S_IFDIR) { |
| 102 | fprintf(stderr, "mv: directory rename only\n"); |
| 103 | return(1); |
| 104 | } |
| 105 | if (stat(target, &s2) >= 0) { |
| 106 | if ((s2.st_mode & S_IFMT) == S_IFDIR) { |
| 107 | sprintf(buf, "%s/%s", target, dname(source)); |
| 108 | target = buf; |
| 109 | } |
| 110 | if (stat(target, &s2) >= 0) { |
| 111 | if ((s2.st_mode & S_IFMT) == S_IFDIR) { |
| 112 | fprintf(stderr, "mv: %s is a directory\n", target); |
| 113 | return(1); |
| 114 | } else if (iflag && !fflag) { |
| 115 | fprintf(stderr, "remove %s? ", target); |
| 116 | i = c = getchar(); |
| 117 | while (c != '\n' && c != EOF) |
| 118 | c = getchar(); |
| 119 | if (i != 'y') |
| 120 | return(1); |
| 121 | } |
| 122 | if (s1.st_dev==s2.st_dev && s1.st_ino==s2.st_ino) { |
| 123 | fprintf(stderr, "mv: %s and %s are identical\n", |
| 124 | source, target); |
| 125 | return(1); |
| 126 | } |
| 127 | if (access(target, 2) < 0 && !fflag && isatty(fileno(stdin))) { |
| 128 | fprintf(stderr, "override protection %o for %s? ", |
| 129 | s2.st_mode & MODEBITS, target); |
| 130 | i = c = getchar(); |
| 131 | while (c != '\n' && c != EOF) |
| 132 | c = getchar(); |
| 133 | if (i != 'y') |
| 134 | return(1); |
| 135 | } |
| 136 | if (unlink(target) < 0) { |
| 137 | fprintf(stderr, "mv: cannot unlink %s\n", target); |
| 138 | return(1); |
| 139 | } |
| 140 | } |
| 141 | } |
| 142 | if (link(source, target) < 0) { |
| 143 | i = fork(); |
| 144 | if (i == -1) { |
| 145 | fprintf(stderr, "mv: try again\n"); |
| 146 | return(1); |
| 147 | } |
| 148 | if (i == 0) { |
| 149 | execl("/bin/cp", "cp", source, target, 0); |
| 150 | fprintf(stderr, "mv: cannot exec cp\n"); |
| 151 | exit(1); |
| 152 | } |
| 153 | while ((c = wait(&status)) != i && c != -1) |
| 154 | ; |
| 155 | if (status != 0) |
| 156 | return(1); |
| 157 | utime(target, &s1.st_atime); |
| 158 | } |
| 159 | if (unlink(source) < 0) { |
| 160 | fprintf(stderr, "mv: cannot unlink %s\n", source); |
| 161 | return(1); |
| 162 | } |
| 163 | return(0); |
| 164 | } |
| 165 | |
| 166 | mvdir(source, target) |
| 167 | char *source, *target; |
| 168 | { |
| 169 | register char *p; |
| 170 | register i; |
| 171 | char buf[MAXN]; |
| 172 | char c,cc; |
| 173 | |
| 174 | if (stat(target, &s2) >= 0) { |
| 175 | if ((s2.st_mode&S_IFMT) != S_IFDIR) { |
| 176 | fprintf(stderr, "mv: %s exists\n", target); |
| 177 | return(1); |
| 178 | } |
| 179 | p = dname(source); |
| 180 | if (strlen(target) > MAXN-strlen(p)-2) { |
| 181 | fprintf(stderr, "mv :target name too long\n"); |
| 182 | return(1); |
| 183 | } |
| 184 | strcpy(buf, target); |
| 185 | target = buf; |
| 186 | strcat(buf, SDELIM); |
| 187 | strcat(buf, p); |
| 188 | if (stat(target, &s2) >= 0) { |
| 189 | fprintf(stderr, "mv: %s exists\n", buf); |
| 190 | return(1); |
| 191 | } |
| 192 | } |
| 193 | if (strcmp(source, target) == 0) { |
| 194 | fprintf(stderr, "mv: ?? source == target, source exists and target doesnt\n"); |
| 195 | return(1); |
| 196 | } |
| 197 | p = dname(source); |
| 198 | if (!strcmp(p, DOT) || !strcmp(p, DOTDOT) || !strcmp(p, "") || p[strlen(p)-1]=='/') { |
| 199 | fprintf(stderr, "mv: cannot rename %s\n", p); |
| 200 | return(1); |
| 201 | } |
| 202 | if (stat(pname(source), &s1) < 0 || stat(pname(target), &s2) < 0) { |
| 203 | fprintf(stderr, "mv: cannot locate parent\n"); |
| 204 | return(1); |
| 205 | } |
| 206 | if (access(pname(target), 2) < 0) { |
| 207 | fprintf(stderr, "mv: no write access to %s\n", pname(target)); |
| 208 | return(1); |
| 209 | } |
| 210 | if (access(pname(source), 2) < 0) { |
| 211 | fprintf(stderr, "mv: no write access to %s\n", pname(source)); |
| 212 | return(1); |
| 213 | } |
| 214 | if (s1.st_dev != s2.st_dev) { |
| 215 | fprintf(stderr, "mv: cannot move directories across devices\n"); |
| 216 | return(1); |
| 217 | } |
| 218 | if (s1.st_ino != s2.st_ino) { |
| 219 | char dst[MAXN+5]; |
| 220 | |
| 221 | if (chkdot(source) || chkdot(target)) { |
| 222 | fprintf(stderr, "mv: Sorry, path names including %s aren't allowed\n", DOTDOT); |
| 223 | return(1); |
| 224 | } |
| 225 | stat(source, &s1); |
| 226 | if (check(pname(target), s1.st_ino)) |
| 227 | return(1); |
| 228 | for (i = 1; i <= NSIG; i++) |
| 229 | signal(i, SIG_IGN); |
| 230 | if (link(source, target) < 0) { |
| 231 | fprintf(stderr, "mv: cannot link %s to %s\n", target, source); |
| 232 | return(1); |
| 233 | } |
| 234 | if (unlink(source) < 0) { |
| 235 | fprintf(stderr, "mv: %s: cannot unlink\n", source); |
| 236 | unlink(target); |
| 237 | return(1); |
| 238 | } |
| 239 | strcat(dst, target); |
| 240 | strcat(dst, "/"); |
| 241 | strcat(dst, DOTDOT); |
| 242 | if (unlink(dst) < 0) { |
| 243 | fprintf(stderr, "mv: %s: cannot unlink\n", dst); |
| 244 | if (link(target, source) >= 0) |
| 245 | unlink(target); |
| 246 | return(1); |
| 247 | } |
| 248 | if (link(pname(target), dst) < 0) { |
| 249 | fprintf(stderr, "mv: cannot link %s to %s\n", |
| 250 | dst, pname(target)); |
| 251 | if (link(pname(source), dst) >= 0) |
| 252 | if (link(target, source) >= 0) |
| 253 | unlink(target); |
| 254 | return(1); |
| 255 | } |
| 256 | return(0); |
| 257 | } |
| 258 | if (link(source, target) < 0) { |
| 259 | fprintf(stderr, "mv: cannot link %s and %s\n", |
| 260 | source, target); |
| 261 | return(1); |
| 262 | } |
| 263 | if (unlink(source) < 0) { |
| 264 | fprintf(stderr, "mv: ?? cannot unlink %s\n", source); |
| 265 | return(1); |
| 266 | } |
| 267 | return(0); |
| 268 | } |
| 269 | |
| 270 | char * |
| 271 | pname(name) |
| 272 | register char *name; |
| 273 | { |
| 274 | register c; |
| 275 | register char *p, *q; |
| 276 | static char buf[MAXN]; |
| 277 | |
| 278 | p = q = buf; |
| 279 | while (c = *p++ = *name++) |
| 280 | if (c == DELIM) |
| 281 | q = p-1; |
| 282 | if (q == buf && *q == DELIM) |
| 283 | q++; |
| 284 | *q = 0; |
| 285 | return buf[0]? buf : DOT; |
| 286 | } |
| 287 | |
| 288 | char * |
| 289 | dname(name) |
| 290 | register char *name; |
| 291 | { |
| 292 | register char *p; |
| 293 | |
| 294 | p = name; |
| 295 | while (*p) |
| 296 | if (*p++ == DELIM && *p) |
| 297 | name = p; |
| 298 | return name; |
| 299 | } |
| 300 | |
| 301 | check(spth, dinode) |
| 302 | char *spth; |
| 303 | ino_t dinode; |
| 304 | { |
| 305 | char nspth[MAXN]; |
| 306 | struct stat sbuf; |
| 307 | |
| 308 | sbuf.st_ino = 0; |
| 309 | |
| 310 | strcpy(nspth, spth); |
| 311 | while (sbuf.st_ino != ROOTINO) { |
| 312 | if (stat(nspth, &sbuf) < 0) { |
| 313 | fprintf(stderr, "mv: cannot access %s\n", nspth); |
| 314 | return(1); |
| 315 | } |
| 316 | if (sbuf.st_ino == dinode) { |
| 317 | fprintf(stderr, "mv: cannot move a directory into itself\n"); |
| 318 | return(1); |
| 319 | } |
| 320 | if (strlen(nspth) > MAXN-2-sizeof(DOTDOT)) { |
| 321 | fprintf(stderr, "mv: name too long\n"); |
| 322 | return(1); |
| 323 | } |
| 324 | strcat(nspth, SDELIM); |
| 325 | strcat(nspth, DOTDOT); |
| 326 | } |
| 327 | return(0); |
| 328 | } |
| 329 | |
| 330 | chkdot(s) |
| 331 | register char *s; |
| 332 | { |
| 333 | do { |
| 334 | if (strcmp(dname(s), DOTDOT) == 0) |
| 335 | return(1); |
| 336 | s = pname(s); |
| 337 | } while (strcmp(s, DOT) != 0 && strcmp(s, SDELIM) != 0); |
| 338 | return(0); |
| 339 | } |