1 /* 2 * Copyright (c) 1980 Regents of the University of California. 3 * All rights reserved. The Berkeley software License Agreement 4 * specifies the terms and conditions for redistribution. 5 */ 6 7 #ifndef lint 8 char copyright[] = 9 "@(#) Copyright (c) 1980 Regents of the University of California.\n\ 10 All rights reserved.\n"; 11 #endif not lint 12 13 #ifndef lint 14 static char sccsid[] = "@(#)tar.c 5.3 (Berkeley) 08/13/85"; 15 #endif not lint 16 17 /* 18 * Tape Archival Program 19 */ 20 #include <stdio.h> 21 #include <sys/param.h> 22 #include <sys/stat.h> 23 #include <sys/dir.h> 24 #include <sys/ioctl.h> 25 #include <sys/mtio.h> 26 #include <sys/time.h> 27 #include <signal.h> 28 #include <errno.h> 29 30 #define TBLOCK 512 31 #define NBLOCK 20 32 #define NAMSIZ 100 33 #define FILEBLOCK 20 34 35 #define writetape(b) writetbuf(b, 1) 36 #define min(a,b) ((a) < (b) ? (a) : (b)) 37 #define max(a,b) ((a) > (b) ? (a) : (b)) 38 39 union hblock { 40 char dummy[TBLOCK]; 41 struct header { 42 char name[NAMSIZ]; 43 char mode[8]; 44 char uid[8]; 45 char gid[8]; 46 char size[12]; 47 char mtime[12]; 48 char chksum[8]; 49 char linkflag; 50 char linkname[NAMSIZ]; 51 } dbuf; 52 }; 53 54 struct linkbuf { 55 ino_t inum; 56 dev_t devnum; 57 int count; 58 char pathname[NAMSIZ]; 59 struct linkbuf *nextp; 60 }; 61 62 union hblock dblock; 63 union hblock *tbuf; 64 struct linkbuf *ihead; 65 struct stat stbuf; 66 67 int rflag; 68 int xflag; 69 int vflag; 70 int tflag; 71 int cflag; 72 int mflag; 73 int fflag; 74 int iflag; 75 int oflag; 76 int pflag; 77 int wflag; 78 int hflag; 79 int Bflag; 80 int Fflag; 81 82 int mt; 83 int mtdev = 1; 84 int term; 85 int chksum; 86 int recno; 87 int first; 88 int prtlinkerr; 89 int freemem = 1; 90 int nblock = 0; 91 int onintr(); 92 int onquit(); 93 int onhup(); 94 #ifdef notdef 95 int onterm(); 96 #endif 97 98 daddr_t low; 99 daddr_t high; 100 daddr_t bsrch(); 101 102 FILE *vfile = stdout; 103 FILE *tfile; 104 char tname[] = "/tmp/tarXXXXXX"; 105 char *usefile; 106 char magtape[] = "/dev/rmt8"; 107 char *malloc(); 108 char *sprintf(); 109 char *strcat(); 110 char *rindex(); 111 char *getcwd(); 112 char *getwd(); 113 char *getmem(); 114 115 main(argc, argv) 116 int argc; 117 char *argv[]; 118 { 119 char *cp; 120 121 if (argc < 2) 122 usage(); 123 124 tfile = NULL; 125 usefile = magtape; 126 argv[argc] = 0; 127 argv++; 128 for (cp = *argv++; *cp; cp++) 129 switch(*cp) { 130 131 case 'f': 132 if (*argv == 0) { 133 fprintf(stderr, 134 "tar: tapefile must be specified with 'f' option\n"); 135 usage(); 136 } 137 usefile = *argv++; 138 fflag++; 139 break; 140 141 case 'c': 142 cflag++; 143 rflag++; 144 break; 145 146 case 'o': 147 oflag++; 148 break; 149 150 case 'p': 151 pflag++; 152 break; 153 154 case 'u': 155 mktemp(tname); 156 if ((tfile = fopen(tname, "w")) == NULL) { 157 fprintf(stderr, 158 "tar: cannot create temporary file (%s)\n", 159 tname); 160 done(1); 161 } 162 fprintf(tfile, "!!!!!/!/!/!/!/!/!/! 000\n"); 163 /*FALL THRU*/ 164 165 case 'r': 166 rflag++; 167 break; 168 169 case 'v': 170 vflag++; 171 break; 172 173 case 'w': 174 wflag++; 175 break; 176 177 case 'x': 178 xflag++; 179 break; 180 181 case 't': 182 tflag++; 183 break; 184 185 case 'm': 186 mflag++; 187 break; 188 189 case '-': 190 break; 191 192 case '0': 193 case '1': 194 case '4': 195 case '5': 196 case '7': 197 case '8': 198 magtape[8] = *cp; 199 usefile = magtape; 200 break; 201 202 case 'b': 203 if (*argv == 0) { 204 fprintf(stderr, 205 "tar: blocksize must be specified with 'b' option\n"); 206 usage(); 207 } 208 nblock = atoi(*argv); 209 if (nblock <= 0) { 210 fprintf(stderr, 211 "tar: invalid blocksize \"%s\"\n", *argv); 212 done(1); 213 } 214 argv++; 215 break; 216 217 case 'l': 218 prtlinkerr++; 219 break; 220 221 case 'h': 222 hflag++; 223 break; 224 225 case 'i': 226 iflag++; 227 break; 228 229 case 'B': 230 Bflag++; 231 break; 232 233 case 'F': 234 Fflag++; 235 break; 236 237 default: 238 fprintf(stderr, "tar: %c: unknown option\n", *cp); 239 usage(); 240 } 241 242 if (!rflag && !xflag && !tflag) 243 usage(); 244 if (rflag) { 245 if (cflag && tfile != NULL) 246 usage(); 247 if (signal(SIGINT, SIG_IGN) != SIG_IGN) 248 signal(SIGINT, onintr); 249 if (signal(SIGHUP, SIG_IGN) != SIG_IGN) 250 signal(SIGHUP, onhup); 251 if (signal(SIGQUIT, SIG_IGN) != SIG_IGN) 252 signal(SIGQUIT, onquit); 253 #ifdef notdef 254 if (signal(SIGTERM, SIG_IGN) != SIG_IGN) 255 signal(SIGTERM, onterm); 256 #endif 257 if (strcmp(usefile, "-") == 0) { 258 if (cflag == 0) { 259 fprintf(stderr, 260 "tar: can only create standard output archives\n"); 261 done(1); 262 } 263 vfile = stderr; 264 setlinebuf(vfile); 265 mt = dup(1); 266 } else if ((mt = open(usefile, 2)) < 0) { 267 if (cflag == 0 || (mt = creat(usefile, 0666)) < 0) { 268 fprintf(stderr, 269 "tar: cannot open %s\n", usefile); 270 done(1); 271 } 272 } 273 dorep(argv); 274 done(0); 275 } 276 if (strcmp(usefile, "-") == 0) { 277 mt = dup(0); 278 Bflag++; 279 } else if ((mt = open(usefile, 0)) < 0) { 280 fprintf(stderr, "tar: cannot open %s\n", usefile); 281 done(1); 282 } 283 if (xflag) 284 doxtract(argv); 285 else 286 dotable(); 287 done(0); 288 } 289 290 usage() 291 { 292 fprintf(stderr, 293 "tar: usage: tar -{txru}[cvfblmhopwBi] [tapefile] [blocksize] file1 file2...\n"); 294 done(1); 295 } 296 297 dorep(argv) 298 char *argv[]; 299 { 300 register char *cp, *cp2; 301 char wdir[MAXPATHLEN], tempdir[MAXPATHLEN], *parent; 302 303 if (!cflag) { 304 getdir(); 305 do { 306 passtape(); 307 if (term) 308 done(0); 309 getdir(); 310 } while (!endtape()); 311 backtape(); 312 if (tfile != NULL) { 313 char buf[200]; 314 315 sprintf(buf, 316 "sort +0 -1 +1nr %s -o %s; awk '$1 != prev {print; prev=$1}' %s >%sX; mv %sX %s", 317 tname, tname, tname, tname, tname, tname); 318 fflush(tfile); 319 system(buf); 320 freopen(tname, "r", tfile); 321 fstat(fileno(tfile), &stbuf); 322 high = stbuf.st_size; 323 } 324 } 325 326 (void) getcwd(wdir); 327 while (*argv && ! term) { 328 cp2 = *argv; 329 if (!strcmp(cp2, "-C") && argv[1]) { 330 argv++; 331 if (chdir(*argv) < 0) 332 perror(*argv); 333 else 334 (void) getcwd(wdir); 335 argv++; 336 continue; 337 } 338 parent = wdir; 339 for (cp = *argv; *cp; cp++) 340 if (*cp == '/') 341 cp2 = cp; 342 if (cp2 != *argv) { 343 *cp2 = '\0'; 344 if (chdir(*argv) < 0) { 345 perror(*argv); 346 continue; 347 } 348 parent = getcwd(tempdir); 349 *cp2 = '/'; 350 cp2++; 351 } 352 putfile(*argv++, cp2, parent); 353 if (chdir(wdir) < 0) { 354 fprintf(stderr, "tar: cannot change back?: "); 355 perror(wdir); 356 } 357 } 358 putempty(); 359 putempty(); 360 flushtape(); 361 if (prtlinkerr == 0) 362 return; 363 for (; ihead != NULL; ihead = ihead->nextp) { 364 if (ihead->count == 0) 365 continue; 366 fprintf(stderr, "tar: missing links to %s\n", ihead->pathname); 367 } 368 } 369 370 endtape() 371 { 372 return (dblock.dbuf.name[0] == '\0'); 373 } 374 375 getdir() 376 { 377 register struct stat *sp; 378 int i; 379 380 top: 381 readtape((char *)&dblock); 382 if (dblock.dbuf.name[0] == '\0') 383 return; 384 sp = &stbuf; 385 sscanf(dblock.dbuf.mode, "%o", &i); 386 sp->st_mode = i; 387 sscanf(dblock.dbuf.uid, "%o", &i); 388 sp->st_uid = i; 389 sscanf(dblock.dbuf.gid, "%o", &i); 390 sp->st_gid = i; 391 sscanf(dblock.dbuf.size, "%lo", &sp->st_size); 392 sscanf(dblock.dbuf.mtime, "%lo", &sp->st_mtime); 393 sscanf(dblock.dbuf.chksum, "%o", &chksum); 394 if (chksum != (i = checksum())) { 395 fprintf(stderr, "tar: directory checksum error (%d != %d)\n", 396 chksum, i); 397 if (iflag) 398 goto top; 399 done(2); 400 } 401 if (tfile != NULL) 402 fprintf(tfile, "%s %s\n", dblock.dbuf.name, dblock.dbuf.mtime); 403 } 404 405 passtape() 406 { 407 long blocks; 408 char *bufp; 409 410 if (dblock.dbuf.linkflag == '1') 411 return; 412 blocks = stbuf.st_size; 413 blocks += TBLOCK-1; 414 blocks /= TBLOCK; 415 416 while (blocks-- > 0) 417 readtbuf(&bufp, TBLOCK); 418 } 419 420 putfile(longname, shortname, parent) 421 char *longname; 422 char *shortname; 423 char *parent; 424 { 425 int infile = 0; 426 long blocks; 427 char buf[TBLOCK]; 428 char *bigbuf; 429 register char *cp; 430 struct direct *dp; 431 DIR *dirp; 432 int i; 433 char newparent[NAMSIZ+64]; 434 extern int errno; 435 int maxread; 436 int hint; /* amount to write to get "in sync" */ 437 438 if (!hflag) 439 i = lstat(shortname, &stbuf); 440 else 441 i = stat(shortname, &stbuf); 442 if (i < 0) { 443 switch (errno) { 444 case EACCES: 445 fprintf(stderr, "tar: %s: cannot open file\n", longname); 446 break; 447 case ENOENT: 448 fprintf(stderr, "tar: %s: no such file or directory\n", 449 longname); 450 break; 451 default: 452 fprintf(stderr, "tar: %s: cannot stat file\n", longname); 453 break; 454 } 455 return; 456 } 457 if (tfile != NULL && checkupdate(longname) == 0) 458 return; 459 if (checkw('r', longname) == 0) 460 return; 461 if (Fflag && checkf(shortname, stbuf.st_mode, Fflag) == 0) 462 return; 463 464 switch (stbuf.st_mode & S_IFMT) { 465 case S_IFDIR: 466 for (i = 0, cp = buf; *cp++ = longname[i++];) 467 ; 468 *--cp = '/'; 469 *++cp = 0 ; 470 if (!oflag) { 471 if ((cp - buf) >= NAMSIZ) { 472 fprintf(stderr, "tar: %s: file name too long\n", 473 longname); 474 return; 475 } 476 stbuf.st_size = 0; 477 tomodes(&stbuf); 478 strcpy(dblock.dbuf.name,buf); 479 sprintf(dblock.dbuf.chksum, "%6o", checksum()); 480 writetape((char *)&dblock); 481 } 482 sprintf(newparent, "%s/%s", parent, shortname); 483 if (chdir(shortname) < 0) { 484 perror(shortname); 485 return; 486 } 487 if ((dirp = opendir(".")) == NULL) { 488 fprintf(stderr, "tar: %s: directory read error\n", 489 longname); 490 if (chdir(parent) < 0) { 491 fprintf(stderr, "tar: cannot change back?: "); 492 perror(parent); 493 } 494 return; 495 } 496 while ((dp = readdir(dirp)) != NULL && !term) { 497 if (dp->d_ino == 0) 498 continue; 499 if (!strcmp(".", dp->d_name) || 500 !strcmp("..", dp->d_name)) 501 continue; 502 strcpy(cp, dp->d_name); 503 i = telldir(dirp); 504 closedir(dirp); 505 putfile(buf, cp, newparent); 506 dirp = opendir("."); 507 seekdir(dirp, i); 508 } 509 closedir(dirp); 510 if (chdir(parent) < 0) { 511 fprintf(stderr, "tar: cannot change back?: "); 512 perror(parent); 513 } 514 break; 515 516 case S_IFLNK: 517 tomodes(&stbuf); 518 if (strlen(longname) >= NAMSIZ) { 519 fprintf(stderr, "tar: %s: file name too long\n", 520 longname); 521 return; 522 } 523 strcpy(dblock.dbuf.name, longname); 524 if (stbuf.st_size + 1 >= NAMSIZ) { 525 fprintf(stderr, "tar: %s: symbolic link too long\n", 526 longname); 527 return; 528 } 529 i = readlink(shortname, dblock.dbuf.linkname, NAMSIZ - 1); 530 if (i < 0) { 531 perror(longname); 532 return; 533 } 534 dblock.dbuf.linkname[i] = '\0'; 535 dblock.dbuf.linkflag = '2'; 536 if (vflag) 537 fprintf(vfile, "a %s symbolic link to %s\n", 538 longname, dblock.dbuf.linkname); 539 sprintf(dblock.dbuf.size, "%11lo", 0); 540 sprintf(dblock.dbuf.chksum, "%6o", checksum()); 541 writetape((char *)&dblock); 542 break; 543 544 case S_IFREG: 545 if ((infile = open(shortname, 0)) < 0) { 546 fprintf(stderr, "tar: %s: cannot open file\n", longname); 547 return; 548 } 549 tomodes(&stbuf); 550 if (strlen(longname) >= NAMSIZ) { 551 fprintf(stderr, "tar: %s: file name too long\n", 552 longname); 553 close(infile); 554 return; 555 } 556 strcpy(dblock.dbuf.name, longname); 557 if (stbuf.st_nlink > 1) { 558 struct linkbuf *lp; 559 int found = 0; 560 561 for (lp = ihead; lp != NULL; lp = lp->nextp) 562 if (lp->inum == stbuf.st_ino && 563 lp->devnum == stbuf.st_dev) { 564 found++; 565 break; 566 } 567 if (found) { 568 strcpy(dblock.dbuf.linkname, lp->pathname); 569 dblock.dbuf.linkflag = '1'; 570 sprintf(dblock.dbuf.chksum, "%6o", checksum()); 571 writetape( (char *) &dblock); 572 if (vflag) 573 fprintf(vfile, "a %s link to %s\n", 574 longname, lp->pathname); 575 lp->count--; 576 close(infile); 577 return; 578 } 579 lp = (struct linkbuf *) getmem(sizeof(*lp)); 580 if (lp != NULL) { 581 lp->nextp = ihead; 582 ihead = lp; 583 lp->inum = stbuf.st_ino; 584 lp->devnum = stbuf.st_dev; 585 lp->count = stbuf.st_nlink - 1; 586 strcpy(lp->pathname, longname); 587 } 588 } 589 blocks = (stbuf.st_size + (TBLOCK-1)) / TBLOCK; 590 if (vflag) 591 fprintf(vfile, "a %s %ld blocks\n", longname, blocks); 592 sprintf(dblock.dbuf.chksum, "%6o", checksum()); 593 hint = writetape((char *)&dblock); 594 maxread = max(stbuf.st_blksize, (nblock * TBLOCK)); 595 if ((bigbuf = malloc(maxread)) == 0) { 596 maxread = TBLOCK; 597 bigbuf = buf; 598 } 599 600 while ((i = read(infile, bigbuf, min((hint*TBLOCK), maxread))) > 0 601 && blocks > 0) { 602 register int nblks; 603 604 nblks = ((i-1)/TBLOCK)+1; 605 if (nblks > blocks) 606 nblks = blocks; 607 hint = writetbuf(bigbuf, nblks); 608 blocks -= nblks; 609 } 610 close(infile); 611 if (bigbuf != buf) 612 free(bigbuf); 613 if (blocks != 0 || i != 0) 614 fprintf(stderr, "tar: %s: file changed size\n", 615 longname); 616 while (--blocks >= 0) 617 putempty(); 618 break; 619 620 default: 621 fprintf(stderr, "tar: %s is not a file. Not dumped\n", 622 longname); 623 break; 624 } 625 } 626 627 doxtract(argv) 628 char *argv[]; 629 { 630 long blocks, bytes; 631 char **cp; 632 int ofile; 633 634 for (;;) { 635 getdir(); 636 if (endtape()) 637 break; 638 if (*argv == 0) 639 goto gotit; 640 for (cp = argv; *cp; cp++) 641 if (prefix(*cp, dblock.dbuf.name)) 642 goto gotit; 643 passtape(); 644 continue; 645 646 gotit: 647 if (checkw('x', dblock.dbuf.name) == 0) { 648 passtape(); 649 continue; 650 } 651 if (Fflag) { 652 char *s; 653 654 if ((s = rindex(dblock.dbuf.name, '/')) == 0) 655 s = dblock.dbuf.name; 656 else 657 s++; 658 if (checkf(s, stbuf.st_mode, Fflag) == 0) { 659 passtape(); 660 continue; 661 } 662 } 663 if (checkdir(dblock.dbuf.name)) { /* have a directory */ 664 if (mflag == 0) 665 dodirtimes(&dblock); 666 continue; 667 } 668 if (dblock.dbuf.linkflag == '2') { /* symlink */ 669 unlink(dblock.dbuf.name); 670 if (symlink(dblock.dbuf.linkname, dblock.dbuf.name)<0) { 671 fprintf(stderr, "tar: %s: symbolic link failed\n", 672 dblock.dbuf.name); 673 continue; 674 } 675 if (vflag) 676 fprintf(vfile, "x %s symbolic link to %s\n", 677 dblock.dbuf.name, dblock.dbuf.linkname); 678 #ifdef notdef 679 /* ignore alien orders */ 680 chown(dblock.dbuf.name, stbuf.st_uid, stbuf.st_gid); 681 if (mflag == 0) 682 setimes(dblock.dbuf.name, stbuf.st_mtime); 683 if (pflag) 684 chmod(dblock.dbuf.name, stbuf.st_mode & 07777); 685 #endif 686 continue; 687 } 688 if (dblock.dbuf.linkflag == '1') { /* regular link */ 689 unlink(dblock.dbuf.name); 690 if (link(dblock.dbuf.linkname, dblock.dbuf.name) < 0) { 691 fprintf(stderr, "tar: %s: cannot link\n", 692 dblock.dbuf.name); 693 continue; 694 } 695 if (vflag) 696 fprintf(vfile, "%s linked to %s\n", 697 dblock.dbuf.name, dblock.dbuf.linkname); 698 continue; 699 } 700 if ((ofile = creat(dblock.dbuf.name,stbuf.st_mode&0xfff)) < 0) { 701 fprintf(stderr, "tar: %s - cannot create\n", 702 dblock.dbuf.name); 703 passtape(); 704 continue; 705 } 706 chown(dblock.dbuf.name, stbuf.st_uid, stbuf.st_gid); 707 blocks = ((bytes = stbuf.st_size) + TBLOCK-1)/TBLOCK; 708 if (vflag) 709 fprintf(vfile, "x %s, %ld bytes, %ld tape blocks\n", 710 dblock.dbuf.name, bytes, blocks); 711 for (; blocks > 0;) { 712 register int nread; 713 char *bufp; 714 register int nwant; 715 716 nwant = NBLOCK*TBLOCK; 717 if (nwant > (blocks*TBLOCK)) 718 nwant = (blocks*TBLOCK); 719 nread = readtbuf(&bufp, nwant); 720 if (write(ofile, bufp, (int)min(nread, bytes)) < 0) { 721 fprintf(stderr, 722 "tar: %s: HELP - extract write error\n", 723 dblock.dbuf.name); 724 done(2); 725 } 726 bytes -= nread; 727 blocks -= (((nread-1)/TBLOCK)+1); 728 } 729 close(ofile); 730 if (mflag == 0) 731 setimes(dblock.dbuf.name, stbuf.st_mtime); 732 if (pflag) 733 chmod(dblock.dbuf.name, stbuf.st_mode & 07777); 734 } 735 if (mflag == 0) { 736 dblock.dbuf.name[0] = '\0'; /* process the whole stack */ 737 dodirtimes(&dblock); 738 } 739 } 740 741 dotable() 742 { 743 for (;;) { 744 getdir(); 745 if (endtape()) 746 break; 747 if (vflag) 748 longt(&stbuf); 749 printf("%s", dblock.dbuf.name); 750 if (dblock.dbuf.linkflag == '1') 751 printf(" linked to %s", dblock.dbuf.linkname); 752 if (dblock.dbuf.linkflag == '2') 753 printf(" symbolic link to %s", dblock.dbuf.linkname); 754 printf("\n"); 755 passtape(); 756 } 757 } 758 759 putempty() 760 { 761 char buf[TBLOCK]; 762 763 bzero(buf, sizeof (buf)); 764 writetape(buf); 765 } 766 767 longt(st) 768 register struct stat *st; 769 { 770 register char *cp; 771 char *ctime(); 772 773 pmode(st); 774 printf("%3d/%1d", st->st_uid, st->st_gid); 775 printf("%7D", st->st_size); 776 cp = ctime(&st->st_mtime); 777 printf(" %-12.12s %-4.4s ", cp+4, cp+20); 778 } 779 780 #define SUID 04000 781 #define SGID 02000 782 #define ROWN 0400 783 #define WOWN 0200 784 #define XOWN 0100 785 #define RGRP 040 786 #define WGRP 020 787 #define XGRP 010 788 #define ROTH 04 789 #define WOTH 02 790 #define XOTH 01 791 #define STXT 01000 792 int m1[] = { 1, ROWN, 'r', '-' }; 793 int m2[] = { 1, WOWN, 'w', '-' }; 794 int m3[] = { 2, SUID, 's', XOWN, 'x', '-' }; 795 int m4[] = { 1, RGRP, 'r', '-' }; 796 int m5[] = { 1, WGRP, 'w', '-' }; 797 int m6[] = { 2, SGID, 's', XGRP, 'x', '-' }; 798 int m7[] = { 1, ROTH, 'r', '-' }; 799 int m8[] = { 1, WOTH, 'w', '-' }; 800 int m9[] = { 2, STXT, 't', XOTH, 'x', '-' }; 801 802 int *m[] = { m1, m2, m3, m4, m5, m6, m7, m8, m9}; 803 804 pmode(st) 805 register struct stat *st; 806 { 807 register int **mp; 808 809 for (mp = &m[0]; mp < &m[9];) 810 select(*mp++, st); 811 } 812 813 select(pairp, st) 814 int *pairp; 815 struct stat *st; 816 { 817 register int n, *ap; 818 819 ap = pairp; 820 n = *ap++; 821 while (--n>=0 && (st->st_mode&*ap++)==0) 822 ap++; 823 printf("%c", *ap); 824 } 825 826 /* 827 * Make all directories needed by `name'. If `name' is a 828 * directory itself on the tar tape (indicated by a trailing '/'), 829 * return 1; else 0. 830 */ 831 checkdir(name) 832 register char *name; 833 { 834 register char *cp; 835 836 /* 837 * Quick check for existence of directory. 838 */ 839 if ((cp = rindex(name, '/')) == 0) 840 return (0); 841 *cp = '\0'; 842 if (access(name, 0) == 0) { /* already exists */ 843 *cp = '/'; 844 return (cp[1] == '\0'); /* return (lastchar == '/') */ 845 } 846 *cp = '/'; 847 848 /* 849 * No luck, try to make all directories in path. 850 */ 851 for (cp = name; *cp; cp++) { 852 if (*cp != '/') 853 continue; 854 *cp = '\0'; 855 if (access(name, 0) < 0) { 856 if (mkdir(name, 0777) < 0) { 857 perror(name); 858 *cp = '/'; 859 return (0); 860 } 861 chown(name, stbuf.st_uid, stbuf.st_gid); 862 if (pflag && cp[1] == '\0') 863 chmod(name, stbuf.st_mode & 0777); 864 } 865 *cp = '/'; 866 } 867 return (cp[-1]=='/'); 868 } 869 870 onintr() 871 { 872 signal(SIGINT, SIG_IGN); 873 term++; 874 } 875 876 onquit() 877 { 878 signal(SIGQUIT, SIG_IGN); 879 term++; 880 } 881 882 onhup() 883 { 884 signal(SIGHUP, SIG_IGN); 885 term++; 886 } 887 888 #ifdef notdef 889 onterm() 890 { 891 signal(SIGTERM, SIG_IGN); 892 term++; 893 } 894 #endif 895 896 tomodes(sp) 897 register struct stat *sp; 898 { 899 register char *cp; 900 901 for (cp = dblock.dummy; cp < &dblock.dummy[TBLOCK]; cp++) 902 *cp = '\0'; 903 sprintf(dblock.dbuf.mode, "%6o ", sp->st_mode & 07777); 904 sprintf(dblock.dbuf.uid, "%6o ", sp->st_uid); 905 sprintf(dblock.dbuf.gid, "%6o ", sp->st_gid); 906 sprintf(dblock.dbuf.size, "%11lo ", sp->st_size); 907 sprintf(dblock.dbuf.mtime, "%11lo ", sp->st_mtime); 908 } 909 910 checksum() 911 { 912 register i; 913 register char *cp; 914 915 for (cp = dblock.dbuf.chksum; 916 cp < &dblock.dbuf.chksum[sizeof(dblock.dbuf.chksum)]; cp++) 917 *cp = ' '; 918 i = 0; 919 for (cp = dblock.dummy; cp < &dblock.dummy[TBLOCK]; cp++) 920 i += *cp; 921 return (i); 922 } 923 924 checkw(c, name) 925 char *name; 926 { 927 if (!wflag) 928 return (1); 929 printf("%c ", c); 930 if (vflag) 931 longt(&stbuf); 932 printf("%s: ", name); 933 return (response() == 'y'); 934 } 935 936 response() 937 { 938 char c; 939 940 c = getchar(); 941 if (c != '\n') 942 while (getchar() != '\n') 943 ; 944 else 945 c = 'n'; 946 return (c); 947 } 948 949 checkf(name, mode, howmuch) 950 char *name; 951 int mode, howmuch; 952 { 953 int l; 954 955 if ((mode & S_IFMT) == S_IFDIR){ 956 if ((strcmp(name, "SCCS")==0) || (strcmp(name, "RCS")==0)) 957 return(0); 958 return(1); 959 } 960 if ((l = strlen(name)) < 3) 961 return (1); 962 if (howmuch > 1 && name[l-2] == '.' && name[l-1] == 'o') 963 return (0); 964 if (strcmp(name, "core") == 0 || 965 strcmp(name, "errs") == 0 || 966 (howmuch > 1 && strcmp(name, "a.out") == 0)) 967 return (0); 968 /* SHOULD CHECK IF IT IS EXECUTABLE */ 969 return (1); 970 } 971 972 /* Is the current file a new file, or the newest one of the same name? */ 973 checkupdate(arg) 974 char *arg; 975 { 976 char name[100]; 977 long mtime; 978 daddr_t seekp; 979 daddr_t lookup(); 980 981 rewind(tfile); 982 for (;;) { 983 if ((seekp = lookup(arg)) < 0) 984 return (1); 985 fseek(tfile, seekp, 0); 986 fscanf(tfile, "%s %lo", name, &mtime); 987 return (stbuf.st_mtime > mtime); 988 } 989 } 990 991 done(n) 992 { 993 unlink(tname); 994 exit(n); 995 } 996 997 /* 998 * Does s2 begin with the string s1, on a directory boundary? 999 */ 1000 prefix(s1, s2) 1001 register char *s1, *s2; 1002 { 1003 while (*s1) 1004 if (*s1++ != *s2++) 1005 return (0); 1006 if (*s2) 1007 return (*s2 == '/'); 1008 return (1); 1009 } 1010 1011 #define N 200 1012 int njab; 1013 1014 daddr_t 1015 lookup(s) 1016 char *s; 1017 { 1018 register i; 1019 daddr_t a; 1020 1021 for(i=0; s[i]; i++) 1022 if (s[i] == ' ') 1023 break; 1024 a = bsrch(s, i, low, high); 1025 return (a); 1026 } 1027 1028 daddr_t 1029 bsrch(s, n, l, h) 1030 daddr_t l, h; 1031 char *s; 1032 { 1033 register i, j; 1034 char b[N]; 1035 daddr_t m, m1; 1036 1037 njab = 0; 1038 1039 loop: 1040 if (l >= h) 1041 return ((daddr_t) -1); 1042 m = l + (h-l)/2 - N/2; 1043 if (m < l) 1044 m = l; 1045 fseek(tfile, m, 0); 1046 fread(b, 1, N, tfile); 1047 njab++; 1048 for(i=0; i<N; i++) { 1049 if (b[i] == '\n') 1050 break; 1051 m++; 1052 } 1053 if (m >= h) 1054 return ((daddr_t) -1); 1055 m1 = m; 1056 j = i; 1057 for(i++; i<N; i++) { 1058 m1++; 1059 if (b[i] == '\n') 1060 break; 1061 } 1062 i = cmp(b+j, s, n); 1063 if (i < 0) { 1064 h = m; 1065 goto loop; 1066 } 1067 if (i > 0) { 1068 l = m1; 1069 goto loop; 1070 } 1071 return (m); 1072 } 1073 1074 cmp(b, s, n) 1075 char *b, *s; 1076 { 1077 register i; 1078 1079 if (b[0] != '\n') 1080 exit(2); 1081 for(i=0; i<n; i++) { 1082 if (b[i+1] > s[i]) 1083 return (-1); 1084 if (b[i+1] < s[i]) 1085 return (1); 1086 } 1087 return (b[i+1] == ' '? 0 : -1); 1088 } 1089 1090 readtape(buffer) 1091 char *buffer; 1092 { 1093 char *bufp; 1094 1095 if (first == 0) 1096 getbuf(); 1097 readtbuf(&bufp, TBLOCK); 1098 bcopy(bufp, buffer, TBLOCK); 1099 return(TBLOCK); 1100 } 1101 1102 readtbuf(bufpp, size) 1103 char **bufpp; 1104 int size; 1105 { 1106 register int i; 1107 1108 if (recno >= nblock || first == 0) { 1109 if ((i = bread(mt, tbuf, TBLOCK*nblock)) < 0) { 1110 fprintf(stderr, "tar: tape read error\n"); 1111 done(3); 1112 } 1113 if (first == 0) { 1114 if ((i % TBLOCK) != 0) { 1115 fprintf(stderr, "tar: tape blocksize error\n"); 1116 done(3); 1117 } 1118 i /= TBLOCK; 1119 if (i != nblock) { 1120 fprintf(stderr, "tar: blocksize = %d\n", i); 1121 nblock = i; 1122 } 1123 first = 1; 1124 } 1125 recno = 0; 1126 } 1127 if (size > ((nblock-recno)*TBLOCK)) 1128 size = (nblock-recno)*TBLOCK; 1129 *bufpp = (char *)&tbuf[recno]; 1130 recno += (size/TBLOCK); 1131 return (size); 1132 } 1133 1134 writetbuf(buffer, n) 1135 register char *buffer; 1136 register int n; 1137 { 1138 1139 if (first == 0) { 1140 getbuf(); 1141 first = 1; 1142 } 1143 if (recno >= nblock) { 1144 if (write(mt, tbuf, TBLOCK*nblock) < 0) { 1145 fprintf(stderr,"tar: tape write error\n"); 1146 done(2); 1147 } 1148 recno = 0; 1149 } 1150 1151 /* 1152 * Special case: We have an empty tape buffer, and the 1153 * users data size is >= the tape block size: Avoid 1154 * the bcopy and dma direct to tape. BIG WIN. Add the 1155 * residual to the tape buffer. 1156 */ 1157 while (recno == 0 && n >= nblock) { 1158 if (write(mt, buffer, TBLOCK*nblock) < 0) { 1159 fprintf(stderr,"tar: tape write error\n"); 1160 done(2); 1161 } 1162 n -= nblock; 1163 buffer += (nblock * TBLOCK); 1164 } 1165 1166 while (n-- > 0) { 1167 bcopy(buffer, (char *)&tbuf[recno++], TBLOCK); 1168 buffer += TBLOCK; 1169 if (recno >= nblock) { 1170 if (write(mt, tbuf, TBLOCK*nblock) < 0) { 1171 fprintf(stderr,"tar: tape write error\n"); 1172 done(2); 1173 } 1174 recno = 0; 1175 } 1176 } 1177 1178 /* Tell the user how much to write to get in sync */ 1179 return (nblock - recno); 1180 } 1181 1182 backtape() 1183 { 1184 static struct mtop mtop = {MTBSR, 1}; 1185 1186 if (mtdev == 0) { 1187 if (ioctl(mt, MTIOCTOP, &mtop) < 0) { 1188 fprintf(stderr, "tar: tape backspace error\n"); 1189 done(4); 1190 } 1191 } else 1192 lseek(mt, (daddr_t) -TBLOCK*nblock, 1); 1193 recno--; 1194 } 1195 1196 flushtape() 1197 { 1198 write(mt, tbuf, TBLOCK*nblock); 1199 } 1200 1201 bread(fd, buf, size) 1202 int fd; 1203 char *buf; 1204 int size; 1205 { 1206 int count; 1207 static int lastread = 0; 1208 1209 if (!Bflag) 1210 return (read(fd, buf, size)); 1211 1212 for (count = 0; count < size; count += lastread) { 1213 lastread = read(fd, buf, size - count); 1214 if (lastread <= 0) { 1215 if (count > 0) 1216 return (count); 1217 return (lastread); 1218 } 1219 buf += lastread; 1220 } 1221 return (count); 1222 } 1223 1224 char * 1225 getcwd(buf) 1226 char *buf; 1227 { 1228 if (getwd(buf) == NULL) { 1229 fprintf(stderr, "tar: %s\n", buf); 1230 exit(1); 1231 } 1232 return (buf); 1233 } 1234 1235 getbuf() 1236 { 1237 1238 if (mtdev == 1) { 1239 fstat(mt, &stbuf); 1240 if ((stbuf.st_mode & S_IFMT) == S_IFCHR) 1241 mtdev = 0; 1242 else 1243 mtdev = -1; 1244 } 1245 if (nblock == 0) { 1246 if (mtdev == 0) 1247 nblock = FILEBLOCK; 1248 else { 1249 fstat(mt, &stbuf); 1250 nblock = stbuf.st_blocks / TBLOCK; 1251 } 1252 } 1253 if (nblock == 0) 1254 nblock = FILEBLOCK; 1255 tbuf = (union hblock *)malloc(nblock*TBLOCK); 1256 if (tbuf == NULL) { 1257 fprintf(stderr, "tar: blocksize %d too big, can't get memory\n", 1258 nblock); 1259 done(1); 1260 } 1261 } 1262 1263 /* 1264 * We are really keeping a directory stack, but since all the 1265 * elements of it share a common prefix, we can make do with one 1266 * string. We keep only the current directory path, with an associated 1267 * array of mtime's, one for each '/' in the path. A negative mtime 1268 * means no mtime. The mtime's are offset by one (first index 1, not 1269 * 0) because calling this with the null string causes mtime[0] to be set. 1270 * 1271 * This stack algorithm is not guaranteed to work for tapes created 1272 * with the 'r' option, but the vast majority of tapes with 1273 * directories are not. This avoids saving every directory record on 1274 * the tape and setting all the times at the end. 1275 */ 1276 char dirstack[NAMSIZ]; 1277 #define NTIM (NAMSIZ/2+1) /* a/b/c/d/... */ 1278 time_t mtime[NTIM]; 1279 1280 dodirtimes(hp) 1281 union hblock *hp; 1282 { 1283 register char *p = dirstack; 1284 register char *q = hp->dbuf.name; 1285 register int ndir = 0; 1286 char *savp; 1287 int savndir; 1288 1289 /* Find common prefix */ 1290 while (*p == *q) { 1291 if (*p++ == '/') 1292 ++ndir; 1293 q++; 1294 } 1295 1296 savp = p; 1297 savndir = ndir; 1298 while (*p) { 1299 /* 1300 * Not a child: unwind the stack, setting the times. 1301 * The order we do this doesn't matter, so we go "forward." 1302 */ 1303 if (*p++ == '/') 1304 if (mtime[++ndir] >= 0) { 1305 *--p = '\0'; /* zap the slash */ 1306 setimes(dirstack, mtime[ndir]); 1307 *p++ = '/'; 1308 } 1309 } 1310 p = savp; 1311 ndir = savndir; 1312 1313 /* Push this one on the "stack" */ 1314 while (*p = *q++) /* append the rest of the new dir */ 1315 if (*p++ == '/') 1316 mtime[++ndir] = -1; 1317 mtime[ndir] = stbuf.st_mtime; /* overwrite the last one */ 1318 } 1319 1320 setimes(path, mt) 1321 char *path; 1322 time_t mt; 1323 { 1324 struct timeval tv[2]; 1325 1326 tv[0].tv_sec = time((time_t *) 0); 1327 tv[1].tv_sec = mt; 1328 tv[0].tv_usec = tv[1].tv_usec = 0; 1329 if (utimes(path, tv) < 0) 1330 fprintf(stderr, "tar: can't set time on %s\n", path); 1331 } 1332 1333 char * 1334 getmem(size) 1335 { 1336 char *p = malloc((unsigned) size); 1337 1338 if (p == NULL && freemem) { 1339 fprintf(stderr, 1340 "tar: out of memory, link and directory modtime info lost\n"); 1341 freemem = 0; 1342 } 1343 return (p); 1344 } 1345