]>
Dogcows Code - chaz/tar/blob - src/create.c
1 /* Create a tar archive.
2 Copyright (C) 1985, 1992 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. */
21 * Create a tar archive.
23 * Written 25 Aug 1985 by John Gilmore, ihnp4!hoptoad!gnu.
29 #include <sys/types.h>
52 #if defined(_POSIX_VERSION) || defined(DIRENT)
58 #define DP_NAMELEN(x) strlen((x)->d_name)
59 #endif /* _POSIX_VERSION or DIRENT */
60 #if !defined(_POSIX_VERSION) && !defined(DIRENT) && defined(BSD42)
62 #define DP_NAMELEN(x) (x)->d_namlen
63 #endif /* not _POSIX_VERSION and BSD42 */
66 #define DP_NAMELEN(x) (x)->d_namlen
69 #if defined(USG) && !defined(_POSIX_VERSION) && !defined(DIRENT)
71 #define DP_NAMELEN(x) strlen((x)->d_name)
72 #endif /* USG and not _POSIX_VERSION and not DIRENT */
74 extern struct stat hstat
; /* Stat struct corresponding */
82 extern struct name
*gnu_list_name
;
85 * If there are no symbolic links, there is no lstat(). Use stat().
91 extern void print_header();
93 union record
*start_header();
94 void blank_name_list();
100 void collect_and_sort_names();
102 int deal_with_sparse();
103 void find_new_file_size();
104 void finish_header();
105 int finish_sparse_file();
108 int is_dot_or_dotdot();
114 void write_dir_file();
118 /* This code moved from tar.h since create.c is the only file that cares
119 about 'struct link's. This means that other files might not have to
120 include sys/types.h any more. */
130 struct link
*linklist
; /* Points to first link in list */
132 static nolinks
; /* Gets set if we run out of RAM */
135 * "Scratch" space to store the information about a sparse file before
136 * writing the info into the header or extended header
138 /* struct sp_array *sparsearray;*/
140 /* number of elts storable in the sparsearray */
141 /*int sparse_array_size = 10;*/
147 char *name_from_list();
149 open_archive(0); /* Open for writing */
152 char *buf
= ck_malloc(PATH_MAX
);
155 collect_and_sort_names();
157 while(p
=name_from_list())
159 /* if(!f_dironly) { */
161 while(p
=name_from_list()) {
163 if(p
[strlen(p
)-1]!='/')
165 bufp
=buf
+strlen(buf
);
166 for(q
=gnu_list_name
->dir_contents
;q
&& *q
;q
+=strlen(q
)+1) {
169 dump_file(buf
,-1, 1);
179 while (p
= name_next(1));
190 * Dump a single file. If it's a directory, recurse.
191 * Result is 1 for success, 0 for failure.
192 * Sets global "hstat" to stat() output for this file.
195 dump_file (p
, curdev
, toplevel
)
196 char *p
; /* File name to dump */
197 int curdev
; /* Device our parent dir was on */
198 int toplevel
; /* Whether we are a toplevel call */
200 union record
*header
;
202 extern char *save_name
; /* JF for multi-volume support */
203 extern long save_totsize
;
204 extern long save_sizeleft
;
207 extern time_t new_time
;
208 int critical_error
= 0;
209 time_t restore_times
[2];
210 /* int sparse_ind = 0;*/
213 if(f_confirm
&& !confirm("add",p
))
217 * Use stat if following (rather than dumping) 4.2BSD's
218 * symbolic links. Otherwise, use lstat (which, on non-4.2
219 * systems, is #define'd to stat anyway.
221 #ifdef STX_HIDDEN /* AIX */
222 if (0 != f_follow_links
?
223 statx (p
, &hstat
, STATSIZE
, STX_HIDDEN
):
224 statx (p
, &hstat
, STATSIZE
, STX_HIDDEN
|STX_LINK
))
226 if (0 != f_follow_links
? stat(p
, &hstat
): lstat(p
, &hstat
))
230 msg_perror("can't add file %s",p
);
232 if (!f_ignore_failed_read
|| critical_error
)
237 restore_times
[0] = hstat
.st_atime
;
238 restore_times
[1] = hstat
.st_utime
;
241 if (S_ISHIDDEN (hstat
.st_mode
)) {
242 char *new = (char *)alloca (strlen (p
) + 2);
251 /* See if we only want new files, and check if this one is too old to
252 put in the archive. */
255 && new_time
>hstat
.st_mtime
256 && !S_ISDIR(hstat
.st_mode
)
257 && (f_new_files
>1 || new_time
>hstat
.st_ctime
)) {
259 msg("%s: is unchanged; not dumped",p
);
265 /* See if we are trying to dump the archive */
266 if(ar_dev
&& hstat
.st_dev
==ar_dev
&& hstat
.st_ino
==ar_ino
) {
267 msg("%s is the archive; not dumped",p
);
272 * Check for multiple links.
274 * We maintain a list of all such files that we've written so
275 * far. Any time we see another, we check the list and
276 * avoid dumping the data again if we've done it once already.
278 if (hstat
.st_nlink
> 1
279 && (S_ISREG(hstat
.st_mode
)
281 || S_ISCTG(hstat
.st_mode
)
284 || S_ISCHR(hstat
.st_mode
)
287 || S_ISBLK(hstat
.st_mode
)
290 || S_ISFIFO(hstat
.st_mode
)
293 register struct link
*lp
;
295 /* First quick and dirty. Hashing, etc later FIXME */
296 for (lp
= linklist
; lp
; lp
= lp
->next
) {
297 if (lp
->ino
== hstat
.st_ino
&&
298 lp
->dev
== hstat
.st_dev
) {
299 char *link_name
= lp
->name
;
301 /* We found a link. */
302 while(!f_absolute_paths
&& *link_name
== '/') {
303 static int link_warn
= 0;
306 msg("Removing leading / from absolute links");
311 if (link_name
- lp
->name
>= NAMSIZ
)
312 write_longlink (link_name
);
315 header
= start_header(p
, &hstat
);
321 strncpy(header
->header
.linkname
,
323 if(header
->header
.linkname
[NAMSIZ
-1]) {
325 extern char *find_mangled();
327 mangled
=find_mangled(link_name
);
328 msg("%s: link name too long: mangled to %s",link_name
,mangled
);
329 strncpy(header
->header
.linkname
,mangled
,NAMSIZ
);
331 header
->header
.linkflag
= LF_LINK
;
332 finish_header(header
);
333 /* FIXME: Maybe remove from list after all links found? */
336 if (unlink (p
) == -1)
337 msg_perror ("cannot remove %s", p
);
339 return; /* We dumped it */
343 /* Not found. Add it to the list of possible links. */
344 lp
= (struct link
*)malloc((unsigned)(sizeof(struct link
)+strlen(p
)));
348 "no memory for links, they will be dumped as separate files");
352 lp
->ino
= hstat
.st_ino
;
353 lp
->dev
= hstat
.st_dev
;
360 * This is not a link to a previously dumped file, so dump it.
362 if (S_ISREG(hstat
.st_mode
)
364 || S_ISCTG(hstat
.st_mode
)
368 int f
; /* File descriptor */
371 register union record
*start
;
375 /* int end_nulls = 0; */
380 if (f_sparse_files
) {
382 * JK - This is the test for sparseness: whether the
383 * "size" of the file matches the number of blocks
384 * allocated for it. If there is a smaller number
385 * of blocks that would be necessary to accommodate
386 * a file of this size, we have a sparse file, i.e.,
387 * at least one of those records in the file is just
390 #ifdef hpux /* Nice of HPUX to gratuitiously change it, huh? - mib */
391 if (hstat
.st_size
- (hstat
.st_blocks
* 1024) > 1024 )
393 if (hstat
.st_size
- (hstat
.st_blocks
* RECORDSIZE
) > RECORDSIZE
)
396 int filesize
= hstat
.st_size
;
399 header
= start_header(p
, &hstat
);
405 header
->header
.linkflag
= LF_SPARSE
;
409 * Call the routine that figures out the
410 * layout of the sparse file in question.
411 * UPPERBOUND is the index of the last
412 * element of the "sparsearray," i.e.,
413 * the number of elements it needed to
417 upperbound
= deal_with_sparse(p
, header
);
420 * See if we'll need an extended header
423 if (upperbound
> SPARSE_IN_HDR
-1)
424 header
->header
.isextended
++;
426 * We store the "real" file size so
427 * we can show that in case someone wants
428 * to list the archive, i.e., tar tvf <file>.
429 * It might be kind of disconcerting if the
430 * shrunken file size was the one that showed
433 to_oct((long) hstat
.st_size
, 1+12,
434 header
->header
.realsize
);
437 * This will be the new "size" of the
438 * file, i.e., the size of the file
439 * minus the records of holes that we're
443 find_new_file_size(&filesize
, upperbound
);
444 hstat
.st_size
= filesize
;
445 to_oct((long) filesize
, 1+12,
446 header
->header
.size
);
447 /* to_oct((long) end_nulls, 1+12,
448 header->header.ending_blanks);*/
450 for (i
= 0; i
< SPARSE_IN_HDR
; i
++) {
451 if (!sparsearray
[i
].numbytes
)
453 to_oct(sparsearray
[i
].offset
, 1+12,
454 header
->header
.sp
[i
].offset
);
455 to_oct(sparsearray
[i
].numbytes
, 1+12,
456 header
->header
.sp
[i
].numbytes
);
462 upperbound
=SPARSE_IN_HDR
-1;
465 sizeleft
= hstat
.st_size
;
466 /* Don't bother opening empty, world readable files. */
467 if (sizeleft
> 0 || 0444 != (0444 & hstat
.st_mode
)) {
468 f
= open(p
, O_RDONLY
|O_BINARY
);
469 if (f
< 0) goto badperror
;
474 /* If the file is sparse, we've already taken care of this */
476 header
= start_header(p
, &hstat
);
477 if (header
== NULL
) {
485 /* Mark contiguous files, if we support them */
486 if (f_standard
&& S_ISCTG(hstat
.st_mode
)) {
487 header
->header
.linkflag
= LF_CONTIG
;
490 isextended
= header
->header
.isextended
;
491 save_linkflag
= header
->header
.linkflag
;
492 finish_header(header
);
496 /* register union record *exhdr;*/
497 /* int arraybound = SPARSE_EXT_HDR;*/
498 /* static */ int index_offset
= SPARSE_IN_HDR
;
500 extend
: exhdr
= findrec();
507 bzero(exhdr
->charptr
, RECORDSIZE
);
508 for (i
= 0; i
< SPARSE_EXT_HDR
; i
++) {
509 if (i
+index_offset
> upperbound
)
511 to_oct((long) sparsearray
[i
+index_offset
].numbytes
,
513 exhdr
->ext_hdr
.sp
[i
].numbytes
);
514 to_oct((long) sparsearray
[i
+index_offset
].offset
,
516 exhdr
->ext_hdr
.sp
[i
].offset
);
520 if (sum < upperbound)
522 if (index_offset
+i
< upperbound
) {
524 exhdr
->ext_hdr
.isextended
++;
529 if (save_linkflag
== LF_SPARSE
) {
530 if (finish_sparse_file(f
, &sizeleft
, hstat
.st_size
, p
))
534 while (sizeleft
> 0) {
538 save_sizeleft
= sizeleft
;
539 save_totsize
= hstat
.st_size
;
543 bufsize
= endofrecs()->charptr
- start
->charptr
;
545 if (sizeleft
< bufsize
) {
546 /* Last read -- zero out area beyond */
547 bufsize
= (int)sizeleft
;
548 count
= bufsize
% RECORDSIZE
;
550 bzero(start
->charptr
+ sizeleft
,
551 (int)(RECORDSIZE
- count
));
553 count
= read(f
, start
->charptr
, bufsize
);
555 msg_perror("read error at byte %ld, reading\
556 %d bytes, in file %s", hstat
.st_size
- sizeleft
, bufsize
,p
);
561 /* This is nonportable (the type of userec's arg). */
562 userec(start
+(count
-1)/RECORDSIZE
);
564 if (count
== bufsize
) continue;
565 msg( "file %s shrunk by %d bytes, padding with zeros.", p
, sizeleft
);
566 goto padit
; /* Short read */
577 if (unlink (p
) == -1)
578 msg_perror ("cannot remove %s", p
);
580 if (f_atime_preserve
)
581 utime (p
, restore_times
);
585 * File shrunk or gave error, pad out tape to match
586 * the size we specified in the header.
590 save_sizeleft
=sizeleft
;
592 bzero(start
->charptr
,RECORDSIZE
);
594 sizeleft
-=RECORDSIZE
;
600 if (f_atime_preserve
)
601 utime (p
, restore_times
);
606 else if(S_ISLNK(hstat
.st_mode
))
610 hstat
.st_size
= 0; /* Force 0 size on symlink */
611 header
= start_header(p
, &hstat
);
617 size
= readlink(p
, header
->header
.linkname
, NAMSIZ
);
618 if (size
< 0) goto badperror
;
619 if (size
== NAMSIZ
) {
620 char *buf
= ck_malloc(PATH_MAX
);
622 readlink(p
,buf
,PATH_MAX
);
623 /* next_mangle(header->header.linkname); */
624 add_symlink_mangle(buf
,p
,header
->header
.linkname
);
625 msg("symbolic link %s too long: mangling to %s",p
, header
->header
.linkname
);
626 /* size=strlen(header->header.linkname); */
629 header
->header
.linkname
[size
] = '\0';
630 header
->header
.linkflag
= LF_SYMLINK
;
631 finish_header(header
); /* Nothing more to do to it */
634 if (unlink (p
) == -1)
635 msg_perror ("cannot remove %s", p
);
641 else if (S_ISDIR(hstat
.st_mode
))
644 register struct direct
*d
;
648 int our_device
= hstat
.st_dev
;
650 /* Build new prototype name */
653 namebuf
=ck_malloc(buflen
+1);
654 strncpy(namebuf
, p
, buflen
);
655 while (len
>= 1 && '/' == namebuf
[len
-1])
656 len
--; /* Delete trailing slashes */
657 namebuf
[len
++] = '/'; /* Now add exactly one back */
658 namebuf
[len
] = '\0'; /* Make sure null-terminated */
661 * Output directory header record with permissions
662 * FIXME, do this AFTER files, to avoid R/O dir problems?
663 * If old archive format, don't write record at all.
666 hstat
.st_size
= 0; /* Force 0 size on dir */
668 * If people could really read standard archives,
669 * this should be: (FIXME)
670 header = start_header(f_standard? p: namebuf, &hstat);
671 * but since they'd interpret LF_DIR records as
672 * regular files, we'd better put the / on the name.
674 header
= start_header(namebuf
, &hstat
);
678 goto badfile
; /* eg name too long */
682 header
->header
.linkflag
= LF_DUMPDIR
;
684 header
->header
.linkflag
= LF_DIR
;
686 /* If we're gnudumping, we aren't done yet so don't close it. */
688 finish_header(header
); /* Done with directory header */
699 buf
=gnu_list_name
->dir_contents
; /* FOO */
701 for(p_buf
=buf
;p_buf
&& *p_buf
;) {
709 to_oct((long)totsize
,1+12,header
->header
.size
);
710 finish_header(header
);
716 save_sizeleft
=sizeleft
;
717 save_totsize
=totsize
;
720 bufsize
=endofrecs()->charptr
- start
->charptr
;
721 if(sizeleft
<bufsize
) {
723 count
=bufsize%RECORDSIZE
;
725 bzero(start
->charptr
+sizeleft
,RECORDSIZE
-count
);
727 bcopy(p_buf
,start
->charptr
,bufsize
);
730 userec(start
+(bufsize
-1)/RECORDSIZE
);
734 if (f_atime_preserve
)
735 utime (p
, restore_times
);
739 /* Now output all the files in the directory */
742 return; /* Unless the cmdline said not to */
745 * See if we are crossing from one file system to another,
746 * and avoid doing so if the user only wants to dump one file system.
748 if (f_local_filesys
&& !toplevel
&& curdev
!= hstat
.st_dev
) {
750 msg("%s: is on a different filesystem; not dumped",p
);
759 msg_perror ("can't open directory %s",p
);
761 msg("error opening directory %s",
767 /* Hack to remove "./" from the front of all the file names */
768 if (len
== 2 && namebuf
[0] == '.' && namebuf
[1]=='/')
771 /* Should speed this up by cd-ing into the dir, FIXME */
772 while (NULL
!= (d
=readdir(dirp
))) {
774 if(is_dot_or_dotdot(d
->d_name
))
777 if (DP_NAMELEN(d
) + len
>= buflen
) {
778 buflen
=len
+DP_NAMELEN(d
);
779 namebuf
=ck_realloc(namebuf
,buflen
+1);
780 /* namebuf[len]='\0';
781 msg("file name %s%s too long",
785 strcpy(namebuf
+len
, d
->d_name
);
786 if(f_exclude
&& check_exclude(namebuf
))
788 dump_file(namebuf
, our_device
, 0);
793 if (f_atime_preserve
)
794 utime (p
, restore_times
);
799 else if (S_ISCHR(hstat
.st_mode
)) {
805 else if (S_ISBLK(hstat
.st_mode
)) {
810 /* Avoid screwy apollo lossage where S_IFIFO == S_IFSOCK */
811 #if (_ISP__M68K == 0) && (_ISP__A88K == 0) && defined(S_ISFIFO)
812 else if (S_ISFIFO(hstat
.st_mode
)) {
818 else if (S_ISSOCK(hstat
.st_mode
)) {
825 if (!f_standard
) goto unknown
;
827 hstat
.st_size
= 0; /* Force 0 size */
828 header
= start_header(p
, &hstat
);
832 goto badfile
; /* eg name too long */
835 header
->header
.linkflag
= type
;
836 #if defined(S_IFBLK) || defined(S_IFCHR)
837 if (type
!= LF_FIFO
) {
838 to_oct((long) major(hstat
.st_rdev
), 8,
839 header
->header
.devmajor
);
840 to_oct((long) minor(hstat
.st_rdev
), 8,
841 header
->header
.devminor
);
845 finish_header(header
);
848 if (unlink (p
) == -1)
849 msg_perror ("cannot remove %s", p
);
854 msg("%s: Unknown file type; file ignored.", p
);
858 finish_sparse_file(fd
, sizeleft
, fullsize
, name
)
865 char tempbuf
[RECORDSIZE
];
873 while (*sizeleft
> 0) {
875 bzero(start
->charptr
, RECORDSIZE
);
876 bufsize
= sparsearray
[sparse_ind
].numbytes
;
877 if (!bufsize
) { /* we blew it, maybe */
878 msg("Wrote %ld of %ld bytes to file %s",
879 fullsize
- *sizeleft
, fullsize
, name
);
882 pos
= lseek(fd
, sparsearray
[sparse_ind
++].offset
, 0);
884 * If the number of bytes to be written here exceeds
885 * the size of the temporary buffer, do it in steps.
887 while (bufsize
> RECORDSIZE
) {
889 count = read(fd, start->charptr+amt_read, RECORDSIZE-amt_read);
890 bufsize -= RECORDSIZE - amt_read;
894 bzero(start->charptr, RECORDSIZE);
897 count
= read(fd
, start
->charptr
, RECORDSIZE
);
899 msg_perror("read error at byte %ld, reading %d bytes, in file %s",
900 fullsize
- *sizeleft
, bufsize
, name
);
906 nwritten
+= RECORDSIZE
; /* XXX */
908 bzero(start
->charptr
, RECORDSIZE
);
912 clear_buffer(tempbuf
);
913 count
= read(fd
, tempbuf
, bufsize
);
914 bcopy(tempbuf
, start
->charptr
, RECORDSIZE
);
916 msg_perror("read error at byte %ld, reading %d bytes, in file %s",
917 fullsize
- *sizeleft
, bufsize
, name
);
920 /* if (amt_read >= RECORDSIZE) {
922 userec(start+(count-1)/RECORDSIZE);
923 if (count != bufsize) {
924 msg("file %s shrunk by %d bytes, padding with zeros.", name, sizeleft);
929 amt_read += bufsize;*/
930 nwritten
+= count
; /* XXX */
936 /* printf ("Amount actually written is (I hope) %d.\n", nwritten); */
937 /* userec(start+(count-1)/RECORDSIZE);*/
949 * Make room for our scratch space -- initially is 10 elts long
951 sparsearray
= (struct sp_array
*) malloc(sp_array_size
* sizeof(struct sp_array
));
952 for (i
= 0; i
< sp_array_size
; i
++) {
953 sparsearray
[i
].offset
= 0;
954 sparsearray
[i
].numbytes
= 0;
961 * Okay, we've got a sparse file on our hands -- now, what we need to do is
962 * make a pass through the file and carefully note where any data is, i.e.,
963 * we want to find how far into the file each instance of data is, and how
964 * many bytes are there. We store this information in the sparsearray,
965 * which will later be translated into header information. For now, we use
966 * the sparsearray as convenient storage.
968 * As a side note, this routine is a mess. If I could have found a cleaner
969 * way to do it, I would have. If anyone wants to find a nicer way to do
973 /* There is little point in trimming small amounts of null data at the */
974 /* head and tail of blocks -- it's ok if we only avoid dumping blocks */
975 /* of complete null data */
977 deal_with_sparse(name
, header
, nulls_at_end
)
979 union record
*header
;
984 /* long save_offset;*/
986 /* int current_size = hstat.st_size;*/
989 char buf
[RECORDSIZE
];
991 int read_last_data
= 0; /* did we just read the last record? */
995 header
->header
.isextended
= 0;
997 * Can't open the file -- this problem will be caught later on,
1000 if ((fd
= open(name
, O_RDONLY
)) < 0)
1006 while ((cc
= read(fd
, buf
, sizeof buf
)) != 0) {
1008 if (sparse_ind
> sp_array_size
-1) {
1011 * realloc the scratch area, since we've run out of room --
1013 sparsearray
= (struct sp_array
*)
1014 realloc(sparsearray
,
1015 2 * sp_array_size
* (sizeof(struct sp_array
)));
1018 if (cc
== sizeof buf
) {
1019 if (zero_record(buf
)) {
1021 sparsearray
[sparse_ind
++].numbytes
1025 } else { /* !zero_record(buf) */
1031 sparsearray
[sparse_ind
].offset
1035 } else if (cc
< sizeof buf
) {
1036 /* This has to be the last bit of the file, so this */
1037 /* is somewhat shorter than the above. */
1038 if (!zero_record(buf
)) {
1042 sparsearray
[sparse_ind
].offset
1052 sparsearray
[sparse_ind
++].numbytes
= numbytes
;
1055 return sparse_ind
- 1;
1059 * Just zeroes out the buffer so we don't confuse ourselves with leftover
1068 for (i
= 0; i
< RECORDSIZE
; i
++)
1072 #if 0 /* I'm leaving this as a monument to Joy Kendall, who wrote it -mib */
1075 * This routine takes a character array, and tells where within that array
1076 * the data can be found. It skips over any zeros, and sets the first
1077 * non-zero point in the array to be the "start", and continues until it
1078 * finds non-data again, which is marked as the "end." This routine is
1079 * mainly for 1) seeing how far into a file we must lseek to data, given
1080 * that we have a sparse file, and 2) determining the "real size" of the
1081 * file, i.e., the number of bytes in the sparse file that are data, as
1082 * opposed to the zeros we are trying to skip.
1084 where_is_data(from
, to
, buffer
)
1090 register int save_to
= *to
;
1091 int amidst_data
= 0;
1098 if (*from
< 16) /* don't bother */
1100 /* keep going to make sure there isn't more real
1101 data in this record */
1102 while (i
< RECORDSIZE
) {
1110 else if (buffer
[i
]) {
1116 if (i
== RECORDSIZE
)
1124 /* Note that this routine is only called if zero_record returned true */
1125 #if 0 /* But we actually don't need it at all. */
1126 where_is_data (from
, to
, buffer
)
1132 for (fp
= buffer
; ! *fp
; fp
++)
1134 for (tp
= buffer
+ RECORDSIZE
- 1; ! *tp
; tp
--)
1136 *from
= fp
- buffer
;
1137 *to
= tp
- buffer
+ 1;
1144 * Takes a recordful of data and basically cruises through it to see if
1145 * it's made *entirely* of zeros, returning a 0 the instant it finds
1146 * something that is a non-zero, i.e., useful data.
1154 for (i
= 0; i
< RECORDSIZE
; i
++)
1155 if (buffer
[i
] != '\000')
1161 find_new_file_size(filesize
, highest_index
)
1168 for (i
= 0; sparsearray
[i
].numbytes
&& i
<= highest_index
; i
++)
1169 *filesize
+= sparsearray
[i
].numbytes
;
1173 * Make a header block for the file name whose stat info is st .
1174 * Return header pointer for success, NULL if the name is too long.
1177 start_header(name
, st
)
1179 register struct stat
*st
;
1181 register union record
*header
;
1183 header
= (union record
*) findrec();
1184 bzero(header
->charptr
, sizeof(*header
)); /* XXX speed up */
1187 * Check the file name and put it in the record.
1189 if(!f_absolute_paths
) {
1190 static int warned_once
= 0;
1195 msg("Removing drive spec from names in the archive");
1198 while ('/' == *name
) {
1199 name
++; /* Force relative path */
1201 msg("Removing leading / from absolute path names in the archive.");
1204 strncpy(header
->header
.name
, name
, NAMSIZ
);
1205 if (header
->header
.name
[NAMSIZ
-1]) {
1208 /* next_mangle(header->header.name); */
1209 add_mangle(name
,header
->header
.name
);
1210 msg("%s: is too long: mangling to %s", name
, header
->header
.name
);
1213 to_oct((long) (st
->st_mode
& 07777),
1214 8, header
->header
.mode
);
1215 to_oct((long) st
->st_uid
, 8, header
->header
.uid
);
1216 to_oct((long) st
->st_gid
, 8, header
->header
.gid
);
1217 to_oct((long) st
->st_size
, 1+12, header
->header
.size
);
1218 to_oct((long) st
->st_mtime
, 1+12, header
->header
.mtime
);
1219 /* header->header.linkflag is left as null */
1221 to_oct((long) st
->st_atime
, 1+12, header
->header
.atime
);
1222 to_oct((long) st
->st_ctime
, 1+12, header
->header
.ctime
);
1226 /* Fill in new Unix Standard fields if desired. */
1228 header
->header
.linkflag
= LF_NORMAL
; /* New default */
1229 strcpy(header
->header
.magic
, TMAGIC
); /* Mark as Unix Std */
1230 finduname(header
->header
.uname
, st
->st_uid
);
1231 findgname(header
->header
.gname
, st
->st_gid
);
1238 * Finish off a filled-in header block and write it out.
1239 * We also print the file name and/or full info if verbose is on.
1242 finish_header(header
)
1243 register union record
*header
;
1245 register int i
, sum
;
1248 bcopy(CHKBLANKS
, header
->header
.chksum
, sizeof(header
->header
.chksum
));
1251 p
= header
->charptr
;
1252 for (i
= sizeof(*header
); --i
>= 0; ) {
1254 * We can't use unsigned char here because of old compilers,
1261 * Fill in the checksum field. It's formatted differently
1262 * from the other fields: it has [6] digits, a null, then a
1263 * space -- rather than digits, a space, then a null.
1264 * We use to_oct then write the null in over to_oct's space.
1265 * The final space is already there, from checksumming, and
1266 * to_oct doesn't modify it.
1268 * This is a fast way to do:
1269 * (void) sprintf(header->header.chksum, "%6o", sum);
1271 to_oct((long) sum
, 8, header
->header
.chksum
);
1272 header
->header
.chksum
[6] = '\0'; /* Zap the space */
1277 extern union record
*head
; /* Points to current tape header */
1278 extern int head_standard
; /* Tape header is in ANSI format */
1280 /* These globals are parameters to print_header, sigh */
1282 /* hstat is already set up */
1283 head_standard
= f_standard
;
1292 * Quick and dirty octal conversion.
1293 * Converts long "value" into a "digs"-digit field at "where",
1294 * including a trailing space and room for a null. "digs"==3 means
1295 * 1 digit, a space, and room for a null.
1297 * We assume the trailing null is already there and don't fill it in.
1298 * This fact is used by start_header and finish_header, so don't change it!
1300 * This should be equivalent to:
1301 * (void) sprintf(where, "%*lo ", digs-2, value);
1302 * except that sprintf fills in the trailing null and we don't.
1305 to_oct(value
, digs
, where
)
1306 register long value
;
1308 register char *where
;
1311 --digs
; /* Trailing null slot is left alone */
1312 where
[--digs
] = ' '; /* Put in the space, though */
1314 /* Produce the digits -- at least one */
1316 where
[--digs
] = '0' + (char)(value
& 7); /* one octal digit */
1318 } while (digs
> 0 && value
!= 0);
1320 /* Leading spaces, if necessary */
1322 where
[--digs
] = ' ';
1328 * Write the EOT record(s).
1329 * We actually zero at least one record, through the end of the block.
1330 * Old tar writes garbage after two zeroed records -- and PDtar used to.
1341 bufsize
= endofrecs()->charptr
- p
->charptr
;
1342 bzero(p
->charptr
, bufsize
);
1347 /* Write a LF_LONGLINK or LF_LONGNAME record. */
1351 /* Link name won't fit, so we write
1352 an LF_LONGLINK record. */
1353 hstat
.st_size
= strlen (link_name
) + 1;
1354 header
= start_header ("././@LongLink", &hstat
);
1355 header
->header
.linkflag
= LF_NAMES
;
1356 finish_header (header
);
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