2 Copyright (C) 1988, 1992, 1993 Free Software Foundation
4 This file is part of GNU Tar.
6 GNU Tar is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU Tar is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU Tar; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
23 * Also includes support routines for reading a tar archive.
25 * this version written 26 Aug 1985 by John Gilmore (ihnp4!hoptoad!gnu).
30 #include <sys/types.h>
45 #define isodigit(c) ( ((c) >= '0') && ((c) <= '7') )
50 extern FILE *msg_file;
52 long from_oct (); /* Decode octal number */
53 void demode (); /* Print file mode */
54 void restore_saved_dir_info ();
57 union record *head; /* Points to current archive header */
58 struct stat hstat; /* Stat struct corresponding */
59 int head_standard; /* Tape header is in ANSI format */
62 void close_archive ();
63 void decode_header ();
68 void names_notfound ();
74 void skip_extended_headers ();
76 extern char *quote_copy_string ();
80 * Main loop for reading an archive.
83 read_and (do_something)
84 void (*do_something) ();
86 int status = 3; /* Initial status at start of archive */
88 extern time_t new_time;
91 name_gather (); /* Gather all the names */
92 open_archive (1); /* Open for reading */
97 status = read_header ();
101 case 1: /* Valid header */
102 /* We should decode next field (mode) first... */
103 /* Ensure incoming names are null terminated. */
105 if (!name_match (current_file_name)
106 || (f_new_files && hstat.st_mtime < new_time)
107 || (f_exclude && check_exclude (current_file_name)))
112 if (head->header.linkflag == LF_VOLHDR
113 || head->header.linkflag == LF_MULTIVOL
114 || head->header.linkflag == LF_NAMES)
119 if (f_show_omitted_dirs
120 && head->header.linkflag == LF_DIR)
121 msg ("Omitting %s\n", current_file_name);
122 /* Skip past it in the archive */
123 if (head->header.isextended)
125 save_linkflag = head->header.linkflag;
129 /* register union record *exhdr;
133 if (!exhdr->ext_hdr.isextended) {
139 skip_extended_headers ();
141 /* Skip to the next header on the archive */
142 if (save_linkflag != LF_DIR)
143 skip_file ((long) hstat.st_size);
152 * If the previous header was good, tell them
153 * that we are skipping bad ones.
155 case 0: /* Invalid header */
159 case 3: /* Error on first record */
160 msg ("Hmm, this doesn't look like a tar archive.");
162 case 2: /* Error after record of zeroes */
163 case 1: /* Error after header rec */
164 msg ("Skipping to next file header...");
165 case 0: /* Error after error */
170 case 2: /* Record of zeroes */
172 status = prev_status; /* If error after 0's */
176 case EOF: /* End of archive */
182 restore_saved_dir_info ();
184 names_notfound (); /* Print names not found */
189 * Print a header record, based on tar options.
194 extern char *save_name;
195 int isextended = 0; /* Flag to remember if head is extended */
197 /* Save the record */
200 /* Print the header record */
204 decode_header (head, &hstat, &head_standard, 0);
208 if (f_gnudump && head->header.linkflag == LF_DUMPDIR)
210 size_t size, written, check;
212 extern long save_totsize;
213 extern long save_sizeleft;
218 save_name = current_file_name;
219 save_totsize = hstat.st_size;
221 for (size = hstat.st_size; size > 0; size -= written)
224 save_sizeleft = size;
225 data = findrec ()->charptr;
228 msg ("EOF in archive file?");
231 written = endofrecs ()->charptr - data;
235 check = fwrite (data, sizeof (char), written, msg_file);
236 userec ((union record *) (data + written - 1));
237 if (check != written)
239 msg_perror ("only wrote %ld of %ld bytes to file %s", check, written, current_file_name);
240 skip_file ((long) (size) - written);
246 saverec ((union record **) 0); /* Unsave it */
247 fputc ('\n', msg_file);
252 saverec ((union record **) 0);/* Unsave it */
253 /* Check to see if we have an extended header to skip over also */
254 if (head->header.isextended)
257 /* Skip past the header in the archive */
261 * If we needed to skip any extended headers, do so now, by
262 * reading extended headers and skipping past them in the
267 /* register union record *exhdr;
272 if (!exhdr->ext_hdr.isextended) {
278 skip_extended_headers ();
282 save_name = current_file_name;
283 /* Skip to the next header on the archive */
285 skip_file ((long) hstat.st_size);
293 * Read a record that's supposed to be a header record.
294 * Return its address in "head", and if it is good, the file's
295 * size in hstat.st_size.
297 * Return 1 for success, 0 if the checksum is bad, EOF on eof,
298 * 2 for a record full of zeros (EOF marker).
300 * You must always userec(head) to skip past the header which this
307 register long sum, signed_sum, recsum;
309 register union record *header;
314 static char *next_long_name, *next_long_link;
320 head = header; /* This is our current header */
324 recsum = from_oct (8, header->header.chksum);
328 for (i = sizeof (*header); --i >= 0;)
331 * We can't use unsigned char here because of old compilers,
338 /* Adjust checksum to count the "chksum" field as blanks. */
339 for (i = sizeof (header->header.chksum); --i >= 0;)
341 sum -= 0xFF & header->header.chksum[i];
342 signed_sum -= (char) header->header.chksum[i];
344 sum += ' ' * sizeof header->header.chksum;
345 signed_sum += ' ' * sizeof header->header.chksum;
350 * This is a zeroed record...whole record is 0's except
351 * for the 8 blanks we faked for the checksum field.
356 if (sum != recsum && signed_sum != recsum)
360 * Good record. Decode file size and return.
362 if (header->header.linkflag == LF_LINK)
363 hstat.st_size = 0; /* Links 0 size on tape */
365 hstat.st_size = from_oct (1 + 12, header->header.size);
367 header->header.arch_name[NAMSIZ - 1] = '\0';
368 if (header->header.linkflag == LF_LONGNAME
369 || header->header.linkflag == LF_LONGLINK)
371 longp = ((header->header.linkflag == LF_LONGNAME)
378 bp = *longp = (char *) ck_malloc (hstat.st_size);
380 for (size = hstat.st_size;
384 data = findrec ()->charptr;
387 msg ("Unexpected EOF on archive file");
390 written = endofrecs ()->charptr - data;
394 bcopy (data, bp, written);
396 userec ((union record *) (data + written - 1));
402 name = (next_long_name
404 : head->header.arch_name);
405 if (current_file_name)
406 free (current_file_name);
407 current_file_name = ck_malloc (strlen (name) + 1);
408 strcpy (current_file_name, name);
410 name = (next_long_link
412 : head->header.arch_linkname);
413 if (current_link_name)
414 free (current_link_name);
415 current_link_name = ck_malloc (strlen (name) + 1);
416 strcpy (current_link_name, name);
418 next_long_link = next_long_name = 0;
425 * Decode things from a file header record into a "struct stat".
426 * Also set "*stdp" to !=0 or ==0 depending whether header record is "Unix
427 * Standard" tar format or regular old tar format.
429 * read_header() has already decoded the checksum and length, so we don't.
431 * If wantug != 0, we want the uid/group info decoded from Unix Standard
432 * tapes (for extraction). If == 0, we are just printing anyway, so save time.
434 * decode_header should NOT be called twice for the same record, since the
435 * two calls might use different "wantug" values and thus might end up with
436 * different uid/gid for the two calls. If anybody wants the uid/gid they
437 * should decode it first, and other callers should decode it without uid/gid
438 * before calling a routine, e.g. print_header, that assumes decoded data.
441 decode_header (header, st, stdp, wantug)
442 register union record *header;
443 register struct stat *st;
449 st->st_mode = from_oct (8, header->header.mode);
450 st->st_mode &= 07777;
451 st->st_mtime = from_oct (1 + 12, header->header.mtime);
454 st->st_atime = from_oct (1 + 12, header->header.atime);
455 st->st_ctime = from_oct (1 + 12, header->header.ctime);
458 if (0 == strcmp (header->header.magic, TMAGIC))
460 /* Unix Standard tar archive */
465 st->st_uid = from_oct (8, header->header.uid);
466 st->st_gid = from_oct (8, header->header.gid);
469 (*header->header.uname
470 ? finduid (header->header.uname)
471 : from_oct (8, header->header.uid));
473 (*header->header.gname
474 ? findgid (header->header.gname)
475 : from_oct (8, header->header.gid));
478 #if defined(S_IFBLK) || defined(S_IFCHR)
479 switch (header->header.linkflag)
483 st->st_rdev = makedev (from_oct (8, header->header.devmajor),
484 from_oct (8, header->header.devminor));
490 /* Old fashioned tar archive */
492 st->st_uid = from_oct (8, header->header.uid);
493 st->st_gid = from_oct (8, header->header.gid);
500 * Quick and dirty octal conversion.
502 * Result is -1 if the field is invalid (all blank, or nonoctal).
505 from_oct (digs, where)
507 register char *where;
511 while (isspace (*where))
515 return -1; /* All blank field */
518 while (digs > 0 && isodigit (*where))
519 { /* Scan til nonoctal */
520 value = (value << 3) | (*where++ - '0');
524 if (digs > 0 && *where && !isspace (*where))
525 return -1; /* Ended on non-space/nul */
534 * Plain and fancy file header block logging.
535 * Non-verbose just prints the name, e.g. for "tar t" or "tar x".
536 * This should just contain file names, so it can be fed back into tar
537 * with xargs or the "-T" option. The verbose option can give a bunch
538 * of info, one line per file. I doubt anybody tries to parse its
539 * format, or if they do, they shouldn't. Unix tar is pretty random here
542 * Note that print_header uses the globals <head>, <hstat>, and
543 * <head_standard>, which must be set up in advance. This is not very clean
544 * and should be cleaned up. FIXME.
546 #define UGSWIDTH 18 /* min width of User, group, size */
547 /* UGSWIDTH of 18 means that with user and group names <= 8 chars the columns
548 never shift during the listing. */
549 #define DATEWIDTH 19 /* Last mod date */
550 static int ugswidth = UGSWIDTH; /* Max width encountered so far */
557 char uform[11], gform[11]; /* These hold formatted ints */
559 char size[24]; /* Holds a formatted long or maj, min */
560 time_t longie; /* To make ctime() call portable */
566 fprintf (msg_file, "rec %10d: ", baserec + (ar_record - ar_block));
567 /* annofile(msg_file, (char *)NULL); */
571 /* Just the fax, mam. */
574 name = quote_copy_string (current_file_name);
576 name = current_file_name;
577 fprintf (msg_file, "%s\n", name);
578 if (name != current_file_name)
583 /* File type and modes */
585 switch (head->header.linkflag)
601 msg ("Visible longname error\n");
609 if ('/' == current_file_name[strlen (current_file_name) - 1])
635 demode ((unsigned) hstat.st_mode, modes + 1);
638 longie = hstat.st_mtime;
639 timestamp = ctime (&longie);
640 timestamp[16] = '\0';
641 timestamp[24] = '\0';
643 /* User and group names */
644 if (*head->header.uname && head_standard)
646 user = head->header.uname;
651 (void) sprintf (uform, "%d",
652 from_oct (8, head->header.uid));
654 if (*head->header.gname && head_standard)
656 group = head->header.gname;
661 (void) sprintf (gform, "%d",
662 from_oct (8, head->header.gid));
665 /* Format the file size or major/minor device numbers */
666 switch (head->header.linkflag)
668 #if defined(S_IFBLK) || defined(S_IFCHR)
671 (void) sprintf (size, "%d,%d",
672 major (hstat.st_rdev),
673 minor (hstat.st_rdev));
677 (void) sprintf (size, "%ld",
678 from_oct (1 + 12, head->header.realsize));
681 (void) sprintf (size, "%ld", (long) hstat.st_size);
684 /* Figure out padding and print the whole line. */
685 pad = strlen (user) + strlen (group) + strlen (size) + 1;
689 name = quote_copy_string (current_file_name);
691 name = current_file_name;
692 fprintf (msg_file, "%s %s/%s %*s%s %s %s %s",
699 timestamp + 4, timestamp + 20,
702 if (name != current_file_name)
704 switch (head->header.linkflag)
707 name = quote_copy_string (current_link_name);
709 name = current_link_name;
710 fprintf (msg_file, " -> %s\n", name);
711 if (name != current_link_name)
716 name = quote_copy_string (current_link_name);
718 name = current_link_name;
719 fprintf (msg_file, " link to %s\n", current_link_name);
720 if (name != current_link_name)
725 fprintf (msg_file, " unknown file type '%c'\n",
726 head->header.linkflag);
738 putc ('\n', msg_file);
742 fprintf (msg_file, "--Volume Header--\n");
746 fprintf (msg_file, "--Continued at byte %ld--\n", from_oct (1 + 12, head->header.offset));
750 fprintf (msg_file, "--Mangled file names--\n");
758 * Print a similar line when we make a directory automatically.
761 pr_mkdir (pathname, length, mode)
772 /* File type and modes */
774 demode ((unsigned) mode, modes + 1);
777 fprintf (msg_file, "rec %10d: ", baserec + (ar_record - ar_block));
778 /* annofile(msg_file, (char *)NULL); */
779 name = quote_copy_string (pathname);
782 fprintf (msg_file, "%s %*s %.*s\n",
784 ugswidth + DATEWIDTH,
785 "Creating directory:",
788 if (name != pathname)
795 * Skip over <size> bytes of data in records in the archive.
802 extern long save_totsize;
803 extern long save_sizeleft;
808 save_sizeleft = size;
816 msg ("Unexpected EOF on archive file");
822 save_sizeleft -= RECORDSIZE;
827 skip_extended_headers ()
829 register union record *exhdr;
834 if (!exhdr->ext_hdr.isextended)
844 * Decode the mode string from a stat entry into a 9-char string and a null.
847 demode (mode, string)
848 register unsigned mode;
849 register char *string;
851 register unsigned mask;
852 register char *rwx = "rwxrwxrwx";
854 for (mask = 0400; mask != 0; mask >>= 1)
866 if (string[-7] == 'x')
871 if (string[-4] == 'x')
876 if (string[-1] == 'x')