bin/pax/ar_subs.c

63 static char hdbuf[BLKMULT];		/* space for archive header on read */
68  *	list the contents of an archive which match user supplied pattern(s)
82 	 * figure out archive type; pass any format specific options to the
83 	 * archive option processing routine; call the format init routine. We
98 	 * step through the archive until the format says it is done
126 		 * skip to next archive format header using values calculated
145  *	extract the member(s) of an archive as specified by user supplied
162 	 * figure out archive type; pass any format specific options to the
163 	 * archive option processing routine; call the format init routine;
172 	 * so we can fix up hard links files later in the archive.
180 	 * step through each entry on the archive until the format read routine
195 			 * padding and go back for the next archive member
202 		 * with -u or -D only extract when the archive member is newer
230 		 * this archive member is now been selected. modify the name.
287 			 * process archive members that are not regular files.
316 		 * extract the file from the archive and skip over padding and
351  *	Write an archive. used in both creating a new archive and appends on
352  *	previously written archive.
382 	 * so we can fix up hard links files later in the archive.
395 	 * while there are files to archive, process them one at at time
408 			 * only archive if this file is newer than a file with
409 			 * the same name that is already stored on the archive
429 			 * can avoid writing a header to the archive for a file
476 		 * routine write routine store the file header on the archive
497 		 * Add file data to the archive, quit on write error. if we
498 		 * cannot write the entire file contents to the archive we
499 		 * must pad the archive to replace the missing file data
540  *	Add file to previously written archive. Archive format specified by the
541  *	user must agree with archive. The archive is read first to collect
542  *	modification times (if -u) and locate the archive trailer. The archive
546  *	-u is implemented by adding the new members to the end of the archive.
548  *	version of the same file already stored in the archive. It is expected
550  *	ones stored "earlier" in the archive (this may be a bad assumption as
553  *	the entire archive (from the point were the old version was), or having
555  *	header that invalidates a previous archive record. The POSIX spec left
574 	 * Do not allow an append operation if the actual archive is of a
580 		paxwarn(1, "Cannot mix current archive format %s with %s",
599 	 * some archive formats encode hard links by recording the device and
601 	 * to the archive. When we append, we run the risk that newly added
603 	 * on the archive but during a previous run. If this happens, when the
604 	 * archive is extracted we get INCORRECT hard links. We avoid this by
606 	 * use the same device number as one found on the archive. remapping
609 	 * when the inode number is larger than storage space in the archive
616 	 * reading the archive may take a long time. If verbose tell the user
620 			"%s: Reading archive to position at the end...", argv0);
625 	 * step through the archive until the format says it is done
654 		 * device number seen in the old part of the archive to be
692  * archive()
693  *	write a new archive
697 archive(void)
704 	 * options write the archive
717  *	use any archive storage. The EFFECT OF THE COPY IS THE SAME as if an
718  *	archive was written and then extracted in the destination directory
769 	 * so we can fix up hard links files later in the archive.
780 	 * while there are files to archive, process them
796 		 * archive.
954  *	try to find a valid header in the archive. Uses format specific
961  *	add a new byte from the archive to the end of the buffer and try again.
1000 			 * If we read 0 bytes (EOF) from an archive when we
1002 			 * an archive without the customary block of zeroes
1011 			 * some kind of archive read problem, try to resync the
1015 				paxwarn(1,"Premature end of file on archive read");
1079 		 * time from the archive and place it at the end of the buffer.
1085 				paxwarn(1,"Unable to append, archive header flaw");
1114  *	Figure out what format an archive is. Handles archive with flaws by
1119  *	0 if archive found -1 otherwise
1133 	 * find the smallest header size in all archive formats and then set up
1134 	 * to read the archive.
1181 		 * archive format. Look to see if we have a match. The array
1203 		 * We have a flawed archive, no match. we start searching, but
1216 		 * determine the nature of the flaw in the archive in a
1234 	paxwarn(1, "Sorry, unable to determine archive format.");