2 * Copyright (c) 1992 Keith Muller.
3 * Copyright (c) 1992, 1993
4 * The Regents of the University of California. All rights reserved.
6 * This code is derived from software contributed to Berkeley by
7 * Keith Muller of the University of California, San Diego.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by the University of
20 * California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * @(#)tar.c 8.2 (Berkeley) 4/18/94
38 * $FreeBSD: src/bin/pax/tar.c,v 1.13.2.1 2001/08/01 05:03:12 obrien Exp $
39 * $DragonFly: src/bin/pax/tar.c,v 1.4 2003/09/28 14:39:14 hmp Exp $
42 #include <sys/types.h>
54 * Routines for reading, writing and header identify of various versions of tar
57 static u_long tar_chksm (register char *, register int);
58 static char *name_split (register char *, register int);
59 static int ul_oct (u_long, register char *, register int, int);
61 static int uqd_oct (u_quad_t, register char *, register int, int);
65 * Routines common to all versions of tar
68 static int tar_nodir; /* do not write dirs under old tar */
72 * add the tar trailer of two null blocks
74 * 0 if ok, -1 otherwise (what wr_skip returns)
80 return(wr_skip((off_t)(NULLCNT*BLKMULT)));
85 * no cleanup needed here, just return size of trailer (for append)
87 * size of trailer (2 * BLKMULT)
93 return((off_t)(NULLCNT*BLKMULT));
98 * Called to determine if a header block is a valid trailer. We are passed
99 * the block, the in_sync flag (which tells us we are in resync mode;
100 * looking for a valid header), and cnt (which starts at zero) which is
101 * used to count the number of empty blocks we have seen so far.
103 * 0 if a valid trailer, -1 if not a valid trailer, or 1 if the block
104 * could never contain a header.
108 tar_trail(register char *buf, register int in_resync, register int *cnt)
113 * look for all zero, trailer is two consecutive blocks of zero
115 for (i = 0; i < BLKMULT; ++i) {
121 * if not all zero it is not a trailer, but MIGHT be a header.
127 * When given a zero block, we must be careful!
128 * If we are not in resync mode, check for the trailer. Have to watch
129 * out that we do not mis-identify file data as the trailer, so we do
130 * NOT try to id a trailer during resync mode. During resync mode we
131 * might as well throw this block out since a valid header can NEVER be
132 * a block of all 0 (we must have a valid file name).
134 if (!in_resync && (++*cnt >= NULLCNT))
141 * convert an unsigned long to an octal string. many oddball field
142 * termination characters are used by the various versions of tar in the
143 * different fields. term selects which kind to use. str is '0' padded
144 * at the front to len. we are unable to use only one format as many old
145 * tar readers are very cranky about this.
147 * 0 if the number fit into the string, -1 otherwise
151 ul_oct(u_long val, register char *str, register int len, int term)
156 * term selects the appropriate character(s) for the end of the string
178 * convert and blank pad if there is space
181 *pt-- = '0' + (char)(val & 0x7);
182 if ((val = val >> 3) == (u_long)0)
188 if (val != (u_long)0)
196 * convert an u_quad_t to an octal string. one of many oddball field
197 * termination characters are used by the various versions of tar in the
198 * different fields. term selects which kind to use. str is '0' padded
199 * at the front to len. we are unable to use only one format as many old
200 * tar readers are very cranky about this.
202 * 0 if the number fit into the string, -1 otherwise
206 uqd_oct(u_quad_t val, register char *str, register int len, int term)
211 * term selects the appropriate character(s) for the end of the string
233 * convert and blank pad if there is space
236 *pt-- = '0' + (char)(val & 0x7);
237 if ((val = val >> 3) == 0)
243 if (val != (u_quad_t)0)
251 * calculate the checksum for a tar block counting the checksum field as
252 * all blanks (BLNKSUM is that value pre-calculated, the sum of 8 blanks).
253 * NOTE: we use len to short circuit summing 0's on write since we ALWAYS
254 * pad headers with 0.
256 * unsigned long checksum
260 tar_chksm(register char *blk, register int len)
264 u_long chksm = BLNKSUM; /* initial value is checksum field sum */
267 * add the part of the block before the checksum field
270 stop = blk + CHK_OFFSET;
272 chksm += (u_long)(*pt++ & 0xff);
274 * move past the checksum field and keep going, spec counts the
275 * checksum field as the sum of 8 blanks (which is pre-computed as
277 * ASSUMED: len is greater than CHK_OFFSET. (len is where our 0 padding
278 * starts, no point in summing zero's)
283 chksm += (u_long)(*pt++ & 0xff);
288 * Routines for old BSD style tar (also made portable to sysV tar)
293 * determine if a block given to us is a valid tar header (and not a USTAR
294 * header). We have to be on the lookout for those pesky blocks of all
297 * 0 if a tar header, -1 otherwise
301 tar_id(register char *blk, int size)
304 register HD_USTAR *uhd;
309 uhd = (HD_USTAR *)blk;
312 * check for block of zero's first, a simple and fast test, then make
313 * sure this is not a ustar header by looking for the ustar magic
314 * cookie. We should use TMAGLEN, but some USTAR archive programs are
315 * wrong and create archives missing the \0. Last we check the
316 * checksum. If this is ok we have to assume it is a valid header.
318 if (hd->name[0] == '\0')
320 if (strncmp(uhd->magic, TMAGIC, TMAGLEN - 1) == 0)
322 if (asc_ul(hd->chksum,sizeof(hd->chksum),OCT) != tar_chksm(blk,BLKMULT))
329 * handle tar format specific -o options
331 * 0 if ok -1 otherwise
339 while ((opt = opt_next()) != NULL) {
340 if (strcmp(opt->name, TAR_OPTION) ||
341 strcmp(opt->value, TAR_NODIR)) {
342 paxwarn(1, "Unknown tar format -o option/value pair %s=%s",
343 opt->name, opt->value);
344 paxwarn(1,"%s=%s is the only supported tar format option",
345 TAR_OPTION, TAR_NODIR);
350 * we only support one option, and only when writing
352 if ((act != APPND) && (act != ARCHIVE)) {
353 paxwarn(1, "%s=%s is only supported when writing.",
354 opt->name, opt->value);
365 * extract the values out of block already determined to be a tar header.
366 * store the values in the ARCHD parameter.
372 tar_rd(register ARCHD *arcn, register char *buf)
378 * we only get proper sized buffers passed to us
380 if (tar_id(buf, BLKMULT) < 0)
382 arcn->org_name = arcn->name;
383 arcn->sb.st_nlink = 1;
387 * copy out the name and values in the stat buffer
390 arcn->nlen = l_strncpy(arcn->name, hd->name, sizeof(arcn->name) - 1);
391 arcn->name[arcn->nlen] = '\0';
392 arcn->sb.st_mode = (mode_t)(asc_ul(hd->mode,sizeof(hd->mode),OCT) &
394 arcn->sb.st_uid = (uid_t)asc_ul(hd->uid, sizeof(hd->uid), OCT);
395 arcn->sb.st_gid = (gid_t)asc_ul(hd->gid, sizeof(hd->gid), OCT);
397 arcn->sb.st_size = (off_t)asc_ul(hd->size, sizeof(hd->size), OCT);
399 arcn->sb.st_size = (off_t)asc_uqd(hd->size, sizeof(hd->size), OCT);
401 arcn->sb.st_mtime = (time_t)asc_ul(hd->mtime, sizeof(hd->mtime), OCT);
402 arcn->sb.st_ctime = arcn->sb.st_atime = arcn->sb.st_mtime;
405 * have to look at the last character, it may be a '/' and that is used
406 * to encode this as a directory
408 pt = &(arcn->name[arcn->nlen - 1]);
411 switch(hd->linkflag) {
414 * symbolic link, need to get the link name and set the type in
415 * the st_mode so -v printing will look correct.
417 arcn->type = PAX_SLK;
418 arcn->ln_nlen = l_strncpy(arcn->ln_name, hd->linkname,
419 sizeof(arcn->ln_name) - 1);
420 arcn->ln_name[arcn->ln_nlen] = '\0';
421 arcn->sb.st_mode |= S_IFLNK;
425 * hard link, need to get the link name, set the type in the
426 * st_mode and st_nlink so -v printing will look better.
428 arcn->type = PAX_HLK;
429 arcn->sb.st_nlink = 2;
430 arcn->ln_nlen = l_strncpy(arcn->ln_name, hd->linkname,
431 sizeof(arcn->ln_name) - 1);
432 arcn->ln_name[arcn->ln_nlen] = '\0';
435 * no idea of what type this thing really points at, but
436 * we set something for printing only.
438 arcn->sb.st_mode |= S_IFREG;
442 * It is a directory, set the mode for -v printing
444 arcn->type = PAX_DIR;
445 arcn->sb.st_mode |= S_IFDIR;
446 arcn->sb.st_nlink = 2;
447 arcn->ln_name[0] = '\0';
454 * If we have a trailing / this is a directory and NOT a file.
456 arcn->ln_name[0] = '\0';
460 * it is a directory, set the mode for -v printing
462 arcn->type = PAX_DIR;
463 arcn->sb.st_mode |= S_IFDIR;
464 arcn->sb.st_nlink = 2;
467 * have a file that will be followed by data. Set the
468 * skip value to the size field and calculate the size
471 arcn->type = PAX_REG;
472 arcn->sb.st_mode |= S_IFREG;
473 arcn->pad = TAR_PAD(arcn->sb.st_size);
474 arcn->skip = arcn->sb.st_size;
480 * strip off any trailing slash.
491 * write a tar header for the file specified in the ARCHD to the archive.
492 * Have to check for file types that cannot be stored and file names that
493 * are too long. Be careful of the term (last arg) to ul_oct, each field
494 * of tar has it own spec for the termination character(s).
495 * ASSUMED: space after header in header block is zero filled
497 * 0 if file has data to be written after the header, 1 if file has NO
498 * data to write after the header, -1 if archive write failed
502 tar_wr(register ARCHD *arcn)
506 char hdblk[sizeof(HD_TAR)];
509 * check for those file system types which tar cannot store
514 * user asked that dirs not be written to the archive
520 paxwarn(1, "Tar cannot archive a character device %s",
524 paxwarn(1, "Tar cannot archive a block device %s", arcn->org_name);
527 paxwarn(1, "Tar cannot archive a socket %s", arcn->org_name);
530 paxwarn(1, "Tar cannot archive a fifo %s", arcn->org_name);
535 if (arcn->ln_nlen > sizeof(hd->linkname)) {
536 paxwarn(1,"Link name too long for tar %s", arcn->ln_name);
547 * check file name len, remember extra char for dirs (the / at the end)
550 if (arcn->type == PAX_DIR)
552 if (len >= sizeof(hd->name)) {
553 paxwarn(1, "File name too long for tar %s", arcn->name);
558 * copy the data out of the ARCHD into the tar header based on the type
559 * of the file. Remember many tar readers want the unused fields to be
560 * padded with zero. We set the linkflag field (type), the linkname
561 * (or zero if not used),the size, and set the padding (if any) to be
562 * added after the file data (0 for all other types, as they only have
565 hd = (HD_TAR *)hdblk;
566 l_strncpy(hd->name, arcn->name, sizeof(hd->name) - 1);
567 hd->name[sizeof(hd->name) - 1] = '\0';
570 if (arcn->type == PAX_DIR) {
572 * directories are the same as files, except have a filename
573 * that ends with a /, we add the slash here. No data follows,
576 hd->linkflag = AREGTYPE;
577 memset(hd->linkname, 0, sizeof(hd->linkname));
578 hd->name[len-1] = '/';
579 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 1))
581 } else if (arcn->type == PAX_SLK) {
583 * no data follows this file, so no pad
585 hd->linkflag = SYMTYPE;
586 l_strncpy(hd->linkname,arcn->ln_name, sizeof(hd->linkname) - 1);
587 hd->linkname[sizeof(hd->linkname) - 1] = '\0';
588 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 1))
590 } else if ((arcn->type == PAX_HLK) || (arcn->type == PAX_HRG)) {
592 * no data follows this file, so no pad
594 hd->linkflag = LNKTYPE;
595 l_strncpy(hd->linkname,arcn->ln_name, sizeof(hd->linkname) - 1);
596 hd->linkname[sizeof(hd->linkname) - 1] = '\0';
597 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 1))
601 * data follows this file, so set the pad
603 hd->linkflag = AREGTYPE;
604 memset(hd->linkname, 0, sizeof(hd->linkname));
606 if (ul_oct((u_long)arcn->sb.st_size, hd->size,
607 sizeof(hd->size), 1)) {
609 if (uqd_oct((u_quad_t)arcn->sb.st_size, hd->size,
610 sizeof(hd->size), 1)) {
612 paxwarn(1,"File is too large for tar %s", arcn->org_name);
615 arcn->pad = TAR_PAD(arcn->sb.st_size);
619 * copy those fields that are independent of the type
621 if (ul_oct((u_long)arcn->sb.st_mode, hd->mode, sizeof(hd->mode), 0) ||
622 ul_oct((u_long)arcn->sb.st_uid, hd->uid, sizeof(hd->uid), 0) ||
623 ul_oct((u_long)arcn->sb.st_gid, hd->gid, sizeof(hd->gid), 0) ||
624 ul_oct((u_long)arcn->sb.st_mtime, hd->mtime, sizeof(hd->mtime), 1))
628 * calculate and add the checksum, then write the header. A return of
629 * 0 tells the caller to now write the file data, 1 says no data needs
632 if (ul_oct(tar_chksm(hdblk, sizeof(HD_TAR)), hd->chksum,
633 sizeof(hd->chksum), 3))
635 if (wr_rdbuf(hdblk, sizeof(HD_TAR)) < 0)
637 if (wr_skip((off_t)(BLKMULT - sizeof(HD_TAR))) < 0)
639 if ((arcn->type == PAX_CTG) || (arcn->type == PAX_REG))
645 * header field is out of range
647 paxwarn(1, "Tar header field is too small for %s", arcn->org_name);
652 * Routines for POSIX ustar
657 * initialization for ustar read
659 * 0 if ok, -1 otherwise
665 if ((usrtb_start() < 0) || (grptb_start() < 0))
672 * initialization for ustar write
674 * 0 if ok, -1 otherwise
680 if ((uidtb_start() < 0) || (gidtb_start() < 0))
687 * determine if a block given to us is a valid ustar header. We have to
688 * be on the lookout for those pesky blocks of all zero's
690 * 0 if a ustar header, -1 otherwise
694 ustar_id(char *blk, int size)
696 register HD_USTAR *hd;
700 hd = (HD_USTAR *)blk;
703 * check for block of zero's first, a simple and fast test then check
704 * ustar magic cookie. We should use TMAGLEN, but some USTAR archive
705 * programs are fouled up and create archives missing the \0. Last we
706 * check the checksum. If ok we have to assume it is a valid header.
708 if (hd->name[0] == '\0')
710 if (strncmp(hd->magic, TMAGIC, TMAGLEN - 1) != 0)
712 if (asc_ul(hd->chksum,sizeof(hd->chksum),OCT) != tar_chksm(blk,BLKMULT))
719 * extract the values out of block already determined to be a ustar header.
720 * store the values in the ARCHD parameter.
726 ustar_rd(register ARCHD *arcn, register char *buf)
728 register HD_USTAR *hd;
730 register int cnt = 0;
735 * we only get proper sized buffers
737 if (ustar_id(buf, BLKMULT) < 0)
739 arcn->org_name = arcn->name;
740 arcn->sb.st_nlink = 1;
743 hd = (HD_USTAR *)buf;
746 * see if the filename is split into two parts. if, so joint the parts.
747 * we copy the prefix first and add a / between the prefix and name.
750 if (*(hd->prefix) != '\0') {
751 cnt = l_strncpy(dest, hd->prefix, sizeof(arcn->name) - 2);
756 arcn->nlen = cnt + l_strncpy(dest, hd->name, sizeof(arcn->name) - cnt);
757 arcn->name[arcn->nlen] = '\0';
760 * follow the spec to the letter. we should only have mode bits, strip
761 * off all other crud we may be passed.
763 arcn->sb.st_mode = (mode_t)(asc_ul(hd->mode, sizeof(hd->mode), OCT) &
766 arcn->sb.st_size = (off_t)asc_ul(hd->size, sizeof(hd->size), OCT);
768 arcn->sb.st_size = (off_t)asc_uqd(hd->size, sizeof(hd->size), OCT);
770 arcn->sb.st_mtime = (time_t)asc_ul(hd->mtime, sizeof(hd->mtime), OCT);
771 arcn->sb.st_ctime = arcn->sb.st_atime = arcn->sb.st_mtime;
774 * If we can find the ascii names for gname and uname in the password
775 * and group files we will use the uid's and gid they bind. Otherwise
776 * we use the uid and gid values stored in the header. (This is what
777 * the POSIX spec wants).
779 hd->gname[sizeof(hd->gname) - 1] = '\0';
780 if (gid_name(hd->gname, &(arcn->sb.st_gid)) < 0)
781 arcn->sb.st_gid = (gid_t)asc_ul(hd->gid, sizeof(hd->gid), OCT);
782 hd->uname[sizeof(hd->uname) - 1] = '\0';
783 if (uid_name(hd->uname, &(arcn->sb.st_uid)) < 0)
784 arcn->sb.st_uid = (uid_t)asc_ul(hd->uid, sizeof(hd->uid), OCT);
787 * set the defaults, these may be changed depending on the file type
789 arcn->ln_name[0] = '\0';
793 arcn->sb.st_rdev = (dev_t)0;
796 * set the mode and PAX type according to the typeflag in the header
798 switch(hd->typeflag) {
800 arcn->type = PAX_FIF;
801 arcn->sb.st_mode |= S_IFIFO;
804 arcn->type = PAX_DIR;
805 arcn->sb.st_mode |= S_IFDIR;
806 arcn->sb.st_nlink = 2;
809 * Some programs that create ustar archives append a '/'
810 * to the pathname for directories. This clearly violates
811 * ustar specs, but we will silently strip it off anyway.
813 if (arcn->name[arcn->nlen - 1] == '/')
814 arcn->name[--arcn->nlen] = '\0';
819 * this type requires the rdev field to be set.
821 if (hd->typeflag == BLKTYPE) {
822 arcn->type = PAX_BLK;
823 arcn->sb.st_mode |= S_IFBLK;
825 arcn->type = PAX_CHR;
826 arcn->sb.st_mode |= S_IFCHR;
828 devmajor = (dev_t)asc_ul(hd->devmajor,sizeof(hd->devmajor),OCT);
829 devminor = (dev_t)asc_ul(hd->devminor,sizeof(hd->devminor),OCT);
830 arcn->sb.st_rdev = TODEV(devmajor, devminor);
834 if (hd->typeflag == SYMTYPE) {
835 arcn->type = PAX_SLK;
836 arcn->sb.st_mode |= S_IFLNK;
838 arcn->type = PAX_HLK;
840 * so printing looks better
842 arcn->sb.st_mode |= S_IFREG;
843 arcn->sb.st_nlink = 2;
848 arcn->ln_nlen = l_strncpy(arcn->ln_name, hd->linkname,
849 sizeof(arcn->ln_name) - 1);
850 arcn->ln_name[arcn->ln_nlen] = '\0';
857 * these types have file data that follows. Set the skip and
860 arcn->type = PAX_REG;
861 arcn->pad = TAR_PAD(arcn->sb.st_size);
862 arcn->skip = arcn->sb.st_size;
863 arcn->sb.st_mode |= S_IFREG;
871 * write a ustar header for the file specified in the ARCHD to the archive
872 * Have to check for file types that cannot be stored and file names that
873 * are too long. Be careful of the term (last arg) to ul_oct, we only use
874 * '\0' for the termination character (this is different than picky tar)
875 * ASSUMED: space after header in header block is zero filled
877 * 0 if file has data to be written after the header, 1 if file has NO
878 * data to write after the header, -1 if archive write failed
882 ustar_wr(register ARCHD *arcn)
884 register HD_USTAR *hd;
886 char hdblk[sizeof(HD_USTAR)];
889 * check for those file system types ustar cannot store
891 if (arcn->type == PAX_SCK) {
892 paxwarn(1, "Ustar cannot archive a socket %s", arcn->org_name);
897 * check the length of the linkname
899 if (((arcn->type == PAX_SLK) || (arcn->type == PAX_HLK) ||
900 (arcn->type == PAX_HRG)) && (arcn->ln_nlen >= sizeof(hd->linkname))){
901 paxwarn(1, "Link name too long for ustar %s", arcn->ln_name);
906 * split the path name into prefix and name fields (if needed). if
907 * pt != arcn->name, the name has to be split
909 if ((pt = name_split(arcn->name, arcn->nlen)) == NULL) {
910 paxwarn(1, "File name too long for ustar %s", arcn->name);
913 hd = (HD_USTAR *)hdblk;
917 * split the name, or zero out the prefix
919 if (pt != arcn->name) {
921 * name was split, pt points at the / where the split is to
922 * occur, we remove the / and copy the first part to the prefix
925 l_strncpy(hd->prefix, arcn->name, sizeof(hd->prefix) - 1);
928 memset(hd->prefix, 0, sizeof(hd->prefix));
931 * copy the name part. this may be the whole path or the part after
934 l_strncpy(hd->name, pt, sizeof(hd->name) - 1);
935 hd->name[sizeof(hd->name) - 1] = '\0';
938 * set the fields in the header that are type dependent
942 hd->typeflag = DIRTYPE;
943 memset(hd->linkname, 0, sizeof(hd->linkname));
944 memset(hd->devmajor, 0, sizeof(hd->devmajor));
945 memset(hd->devminor, 0, sizeof(hd->devminor));
946 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
951 if (arcn->type == PAX_CHR)
952 hd->typeflag = CHRTYPE;
954 hd->typeflag = BLKTYPE;
955 memset(hd->linkname, 0, sizeof(hd->linkname));
956 if (ul_oct((u_long)MAJOR(arcn->sb.st_rdev), hd->devmajor,
957 sizeof(hd->devmajor), 3) ||
958 ul_oct((u_long)MINOR(arcn->sb.st_rdev), hd->devminor,
959 sizeof(hd->devminor), 3) ||
960 ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
964 hd->typeflag = FIFOTYPE;
965 memset(hd->linkname, 0, sizeof(hd->linkname));
966 memset(hd->devmajor, 0, sizeof(hd->devmajor));
967 memset(hd->devminor, 0, sizeof(hd->devminor));
968 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
974 if (arcn->type == PAX_SLK)
975 hd->typeflag = SYMTYPE;
977 hd->typeflag = LNKTYPE;
978 l_strncpy(hd->linkname,arcn->ln_name, sizeof(hd->linkname) - 1);
979 hd->linkname[sizeof(hd->linkname) - 1] = '\0';
980 memset(hd->devmajor, 0, sizeof(hd->devmajor));
981 memset(hd->devminor, 0, sizeof(hd->devminor));
982 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
989 * file data with this type, set the padding
991 if (arcn->type == PAX_CTG)
992 hd->typeflag = CONTTYPE;
994 hd->typeflag = REGTYPE;
995 memset(hd->linkname, 0, sizeof(hd->linkname));
996 memset(hd->devmajor, 0, sizeof(hd->devmajor));
997 memset(hd->devminor, 0, sizeof(hd->devminor));
998 arcn->pad = TAR_PAD(arcn->sb.st_size);
1000 if (ul_oct((u_long)arcn->sb.st_size, hd->size,
1001 sizeof(hd->size), 3)) {
1003 if (uqd_oct((u_quad_t)arcn->sb.st_size, hd->size,
1004 sizeof(hd->size), 3)) {
1006 paxwarn(1,"File is too long for ustar %s",arcn->org_name);
1012 l_strncpy(hd->magic, TMAGIC, TMAGLEN);
1013 l_strncpy(hd->version, TVERSION, TVERSLEN);
1016 * set the remaining fields. Some versions want all 16 bits of mode
1017 * we better humor them (they really do not meet spec though)....
1019 if (ul_oct((u_long)arcn->sb.st_mode, hd->mode, sizeof(hd->mode), 3) ||
1020 ul_oct((u_long)arcn->sb.st_uid, hd->uid, sizeof(hd->uid), 3) ||
1021 ul_oct((u_long)arcn->sb.st_gid, hd->gid, sizeof(hd->gid), 3) ||
1022 ul_oct((u_long)arcn->sb.st_mtime,hd->mtime,sizeof(hd->mtime),3))
1024 l_strncpy(hd->uname,name_uid(arcn->sb.st_uid, 0),sizeof(hd->uname));
1025 l_strncpy(hd->gname,name_gid(arcn->sb.st_gid, 0),sizeof(hd->gname));
1028 * calculate and store the checksum write the header to the archive
1029 * return 0 tells the caller to now write the file data, 1 says no data
1030 * needs to be written
1032 if (ul_oct(tar_chksm(hdblk, sizeof(HD_USTAR)), hd->chksum,
1033 sizeof(hd->chksum), 3))
1035 if (wr_rdbuf(hdblk, sizeof(HD_USTAR)) < 0)
1037 if (wr_skip((off_t)(BLKMULT - sizeof(HD_USTAR))) < 0)
1039 if ((arcn->type == PAX_CTG) || (arcn->type == PAX_REG))
1045 * header field is out of range
1047 paxwarn(1, "Ustar header field is too small for %s", arcn->org_name);
1053 * see if the name has to be split for storage in a ustar header. We try
1054 * to fit the entire name in the name field without splitting if we can.
1055 * The split point is always at a /
1057 * character pointer to split point (always the / that is to be removed
1058 * if the split is not needed, the points is set to the start of the file
1059 * name (it would violate the spec to split there). A NULL is returned if
1060 * the file name is too long
1064 name_split(register char *name, register int len)
1066 register char *start;
1069 * check to see if the file name is small enough to fit in the name
1070 * field. if so just return a pointer to the name.
1074 if (len > (TPFSZ + TNMSZ))
1078 * we start looking at the biggest sized piece that fits in the name
1079 * field. We walk forward looking for a slash to split at. The idea is
1080 * to find the biggest piece to fit in the name field (or the smallest
1081 * prefix we can find)
1083 start = name + len - TNMSZ;
1084 while ((*start != '\0') && (*start != '/'))
1088 * if we hit the end of the string, this name cannot be split, so we
1089 * cannot store this file.
1096 * NOTE: /str where the length of str == TNMSZ can not be stored under
1097 * the p1003.1-1990 spec for ustar. We could force a prefix of / and
1098 * the file would then expand on extract to //str. The len == 0 below
1099 * makes this special case follow the spec to the letter.
1101 if ((len >= TPFSZ) || (len == 0))
1105 * ok have a split point, return it to the caller