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- /* Create a tar archive.
- Copyright (C) 1988 Free Software Foundation
-
- This file is part of GNU Tar.
-
- GNU Tar is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 1, or (at your option)
- any later version.
-
- GNU Tar is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with GNU Tar; see the file COPYING. If not, write to
- the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- /*
- * Create a tar archive.
- *
- * Written 25 Aug 1985 by John Gilmore, ihnp4!hoptoad!gnu.
- *
- * @(#)create.c 1.36 11/6/87 - gnu
- */
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <sys/file.h>
- #include <stdio.h>
-
- /* JF: this one is my fault */
- /* #include "utils.h" */
-
- #ifndef V7
- #include <fcntl.h>
- #endif
-
- #if !defined(MSDOS) && !defined(AMIGA)
- #include <pwd.h>
- #include <grp.h>
- #endif
-
- #ifdef BSD42
- #include <sys/dir.h>
- #else
- #ifdef MSDOS
- #include <sys/dir.h>
- #else
- #ifdef USG
- #ifdef NDIR
- #include <ndir.h>
- #else
- #include <dirent.h>
- #endif
- #ifndef DIRECT
- #define direct dirent
- #endif
- #define DP_NAMELEN(x) strlen((x)->d_name)
- #else
- /*
- * FIXME: On other systems there is no standard place for the header file
- * for the portable directory access routines. Change the #include line
- * below to bring it in from wherever it is.
- */
- #include "ndir.h"
- #endif
- #endif
- #endif
-
- #ifndef DP_NAMELEN
- #define DP_NAMELEN(x) (x)->d_namlen
- #endif
-
- #ifdef USG
- #include <sys/sysmacros.h> /* major() and minor() defined here */
- #endif
-
- /*
- * V7 doesn't have a #define for this.
- */
- #ifndef O_RDONLY
- #define O_RDONLY 0
- #endif
-
- /*
- * Most people don't have a #define for this.
- */
- #ifndef O_BINARY
- #define O_BINARY 0
- #endif
-
- #include "tar.h"
- #include "port.h"
-
- extern union record *head; /* Points to current tape header */
- extern struct stat hstat; /* Stat struct corresponding */
- extern int head_standard; /* Tape header is in ANSI format */
-
- extern dev_t ar_dev;
- extern ino_t ar_ino;
-
- /* JF */
- extern struct name *gnu_list_name;
-
- /*
- * If there are no symbolic links, there is no lstat(). Use stat().
- */
- #ifndef S_IFLNK
- #define lstat stat
- #endif
-
- extern char *malloc();
- extern char *strcpy();
- extern char *strncpy();
- extern void bzero();
- extern void bcopy();
- extern int errno;
-
- extern void print_header();
-
- union record *start_header();
- void finish_header();
- void finduname();
- void findgname();
- char *name_next();
- void to_oct();
- void dump_file();
-
- static nolinks; /* Gets set if we run out of RAM */
-
- /*
- * "Scratch" space to store the information about a sparse file before
- * writing the info into the header or extended header
- */
- /* struct sp_array *sparsearray;*/
-
- /* number of elts storable in the sparsearray */
- /*int sparse_array_size = 10;*/
-
- void
- create_archive()
- {
- register char *p;
- char *name_from_list();
-
- open_archive(0); /* Open for writing */
-
- if(f_gnudump) {
- char buf[MAXNAMLEN],*q,*bufp;
-
- collect_and_sort_names();
-
- while(p=name_from_list())
- dump_file(p,-1);
- /* if(!f_dironly) { */
- blank_name_list();
- while(p=name_from_list()) {
- strcpy(buf,p);
- #ifdef AMIGA
- {
- short len = strlen(p) - 1;
- if (p[len] != '/' && p[len] != ':')
- strcat(buf,"/");
- }
-
- #else
- if(p[strlen(p)-1]!='/')
- strcat(buf,"/");
- #endif
- bufp=buf+strlen(buf);
- for(q=gnu_list_name->dir_contents;q && *q;q+=strlen(q)+1) {
- if(*q=='Y') {
- strcpy(bufp,q+1);
- dump_file(buf,-1);
- }
- }
- }
- /* } */
-
- } else {
- p = name_next(1);
- if(!p)
- dump_file(".", -1);
- else {
- do dump_file(p, -1);
- while (p = name_next(1));
- }
- }
-
- write_eot();
- close_archive();
- name_close();
- }
-
- /*
- * Dump a single file. If it's a directory, recurse.
- * Result is 1 for success, 0 for failure.
- * Sets global "hstat" to stat() output for this file.
- */
- void
- dump_file (p, curdev)
- char *p; /* File name to dump */
- int curdev; /* Device our parent dir was on */
- {
- union record *header;
- char type;
- extern char *save_name; /* JF for multi-volume support */
- extern long save_totsize;
- extern long save_sizeleft;
- union record *exhdr;
- char save_linkflag;
- extern time_t new_time;
- int sparse_ind = 0;
-
-
- if(f_confirm && !confirm("add",p))
- return;
-
- /*
- * Use stat if following (rather than dumping) 4.2BSD's
- * symbolic links. Otherwise, use lstat (which, on non-4.2
- * systems, is #define'd to stat anyway.
- */
- if (0 != f_follow_links? stat(p, &hstat): lstat(p, &hstat))
- {
- badperror:
- msg_perror("can't add file %s",p);
- badfile:
- errors++;
- return;
- }
-
- /* See if we only want new files, and check if this one is too old to
- put in the archive. */
- if( f_new_files
- && !f_gnudump
- && new_time>hstat.st_mtime
- && (hstat.st_mode&S_IFMT)!=S_IFDIR
- && (f_new_files>1 || new_time>hstat.st_ctime)) {
- if(curdev<0) {
- msg("%s: is unchanged; not dumped",p);
- }
- return;
- }
-
- /*
- * See if we are crossing from one file system to another,
- * and avoid doing so if the user only wants to dump one file system.
- */
- if (f_local_filesys && curdev >= 0 && curdev != hstat.st_dev) {
- if(f_verbose)
- msg("%s: is on a different filesystem; not dumped",p);
- return;
- }
-
- /* See if we are trying to dump the archive */
- if(ar_dev && hstat.st_dev==ar_dev && hstat.st_ino==ar_ino) {
- msg("%s is the archive; not dumped",p);
- return;
- }
- /*
- * Check for multiple links.
- *
- * We maintain a list of all such files that we've written so
- * far. Any time we see another, we check the list and
- * avoid dumping the data again if we've done it once already.
- */
- if (hstat.st_nlink > 1) switch (hstat.st_mode & S_IFMT) {
- register struct link *lp;
-
- case S_IFREG: /* Regular file */
- #ifdef S_IFCTG
- case S_IFCTG: /* Contigous file */
- #endif
- #ifdef S_IFCHR
- case S_IFCHR: /* Character special file */
- #endif
-
- #ifdef S_IFBLK
- case S_IFBLK: /* Block special file */
- #endif
-
- #ifdef S_IFIFO
- case S_IFIFO: /* Fifo special file */
- #endif
-
- /* First quick and dirty. Hashing, etc later FIXME */
- for (lp = linklist; lp; lp = lp->next) {
- if (lp->ino == hstat.st_ino &&
- lp->dev == hstat.st_dev) {
- char *link_name = lp->name;
-
- /* We found a link. */
- hstat.st_size = 0;
- header = start_header(p, &hstat);
- if (header == NULL) goto badfile;
- while(!f_absolute_paths && *link_name == '/') {
- static int link_warn = 0;
-
- if (!link_warn) {
- msg("Removing leading / from absolute links");
- link_warn++;
- }
- link_name++;
- }
- strcpy(header->header.linkname,
- link_name);
- header->header.linkflag = LF_LINK;
- finish_header(header);
- /* FIXME: Maybe remove from list after all links found? */
- return; /* We dumped it */
- }
- }
-
- /* Not found. Add it to the list of possible links. */
- lp = (struct link *) malloc( (unsigned)
- (strlen(p) + sizeof(struct link) - NAMSIZ));
- if (!lp) {
- if (!nolinks) {
- msg(
- "no memory for links, they will be dumped as separate files");
- nolinks++;
- }
- }
- lp->ino = hstat.st_ino;
- lp->dev = hstat.st_dev;
- strcpy(lp->name, p);
- lp->next = linklist;
- linklist = lp;
- }
-
- /*
- * This is not a link to a previously dumped file, so dump it.
- */
- switch (hstat.st_mode & S_IFMT) {
-
- case S_IFREG: /* Regular file */
- #ifdef S_IFCTG
- case S_IFCTG: /* Contiguous file */
- #endif
- {
- int f; /* File descriptor */
- long bufsize, count;
- long sizeleft;
- register union record *start;
- int header_moved;
- char isextended = 0;
- int upperbound;
- int end_nulls = 0;
-
- header_moved = 0;
-
- #ifdef BSD42
- if (f_sparse_files) {
- /*
- * JK - This is the test for sparseness: whether the
- * "size" of the file matches the number of blocks
- * allocated for it. If there is a smaller number
- * of blocks that would be necessary to accommodate
- * a file of this size, we have a sparse file, i.e.,
- * at least one of those records in the file is just
- * a useless hole.
- */
- if (hstat.st_size - (hstat.st_blocks * RECORDSIZE) > RECORDSIZE) {
- int filesize = hstat.st_size;
- register int i;
-
- printf("File is sparse: %s\n", p);
- header = start_header(p, &hstat);
- if (header == NULL)
- goto badfile;
- header->header.linkflag = LF_SPARSE;
- header_moved++;
-
- /*
- * Call the routine that figures out the
- * layout of the sparse file in question.
- * UPPERBOUND is the index of the last
- * element of the "sparsearray," i.e.,
- * the number of elements it needed to
- * describe the file.
- */
-
- upperbound = deal_with_sparse(p, header);
-
- /*
- * See if we'll need an extended header
- * later
- */
- if (upperbound > SPARSE_IN_HDR-1)
- header->header.isextended++;
- /*
- * We store the "real" file size so
- * we can show that in case someone wants
- * to list the archive, i.e., tar tvf <file>.
- * It might be kind of disconcerting if the
- * shrunken file size was the one that showed
- * up.
- */
- to_oct((long) hstat.st_size, 1+12,
- header->header.realsize);
-
- /*
- * This will be the new "size" of the
- * file, i.e., the size of the file
- * minus the records of holes that we're
- * skipping over.
- */
-
- find_new_file_size(&filesize, upperbound);
- printf("File %s is now size %d\n",
- p, filesize);
- hstat.st_size = filesize;
- to_oct((long) filesize, 1+12,
- header->header.size);
- /* to_oct((long) end_nulls, 1+12,
- header->header.ending_blanks);*/
-
- for (i = 0; i < SPARSE_IN_HDR; i++) {
- if (!sparsearray[i].numbytes)
- break;
- to_oct(sparsearray[i].offset, 1+12,
- header->header.sp[i].offset);
- to_oct(sparsearray[i].numbytes, 1+12,
- header->header.sp[i].numbytes);
- }
-
- }
- }
- #else
- upperbound=SPARSE_IN_HDR-1;
- #endif
-
- sizeleft = hstat.st_size;
- /* Don't bother opening empty, world readable files. */
- if (sizeleft > 0 || 0444 != (0444 & hstat.st_mode)) {
- f = open(p, O_RDONLY|O_BINARY);
- if (f < 0) goto badperror;
- } else {
- f = -1;
- }
-
- /* If the file is sparse, we've already taken care of this */
- if (!header_moved) {
- header = start_header(p, &hstat);
- if (header == NULL) {
- if(f>=0)
- (void)close(f);
- goto badfile;
- }
- }
- #ifdef S_IFCTG
- /* Mark contiguous files, if we support them */
- if (f_standard && (hstat.st_mode & S_IFMT) == S_IFCTG) {
- header->header.linkflag = LF_CONTIG;
- }
- #endif
- isextended = header->header.isextended;
- save_linkflag = header->header.linkflag;
- finish_header(header);
- if (isextended) {
- int sum = 0;
- register int i;
- /* register union record *exhdr;*/
- int arraybound = SPARSE_EXT_HDR;
- /* static */ int index_offset = SPARSE_IN_HDR;
-
- extend: exhdr = findrec();
-
- if (exhdr == NULL) goto badfile;
- bzero(exhdr->charptr, RECORDSIZE);
- for (i = 0; i < SPARSE_EXT_HDR; i++) {
- if (i+index_offset > upperbound)
- break;
- to_oct((long) sparsearray[i+index_offset].numbytes,
- 1+12,
- exhdr->ext_hdr.sp[i].numbytes);
- to_oct((long) sparsearray[i+index_offset].offset,
- 1+12,
- exhdr->ext_hdr.sp[i].offset);
- }
- userec(exhdr);
- /* sum += i;
- if (sum < upperbound)
- goto extend;*/
- if (index_offset+i < upperbound) {
- index_offset += i;
- exhdr->ext_hdr.isextended++;
- goto extend;
- }
-
- }
- if (save_linkflag == LF_SPARSE) {
- if (finish_sparse_file(f, &sizeleft, hstat.st_size, p))
- goto padit;
- }
- else
- while (sizeleft > 0) {
-
- if(f_multivol) {
- save_name = p;
- save_sizeleft = sizeleft;
- save_totsize = hstat.st_size;
- }
- start = findrec();
-
- bufsize = endofrecs()->charptr - start->charptr;
-
- if (sizeleft < bufsize) {
- /* Last read -- zero out area beyond */
- bufsize = (int)sizeleft;
- count = bufsize % RECORDSIZE;
- if (count)
- bzero(start->charptr + sizeleft,
- (int)(RECORDSIZE - count));
- }
- count = read(f, start->charptr, bufsize);
- if (count < 0) {
- msg_perror("read error at byte %ld, reading\
- %d bytes, in file %s", hstat.st_size - sizeleft, bufsize,p);
- goto padit;
- }
- sizeleft -= count;
-
- /* This is nonportable (the type of userec's arg). */
- userec(start+(count-1)/RECORDSIZE);
-
- if (count == bufsize) continue;
- msg( "file %s shrunk by %d bytes, padding with zeros.\n", p, sizeleft);
- goto padit; /* Short read */
- }
-
- if(f_multivol)
- save_name = 0;
-
- if (f >= 0)
- (void)close(f);
-
- break;
-
- /*
- * File shrunk or gave error, pad out tape to match
- * the size we specified in the header.
- */
- padit:
- while(sizeleft>0) {
- save_sizeleft=sizeleft;
- start=findrec();
- bzero(start->charptr,RECORDSIZE);
- userec(start);
- sizeleft-=RECORDSIZE;
- }
- if(f_multivol)
- save_name=0;
- if(f>=0)
- (void)close(f);
- break;
- /* abort(); */
- }
-
- #ifdef S_IFLNK
- case S_IFLNK: /* Symbolic link */
- {
- int size;
-
- hstat.st_size = 0; /* Force 0 size on symlink */
- header = start_header(p, &hstat);
- if (header == NULL) goto badfile;
- size = readlink(p, header->header.linkname, NAMSIZ);
- if (size < 0) goto badperror;
- if (size == NAMSIZ) {
- msg("symbolic link %s too long\n",p);
- break;
- }
- header->header.linkname[size] = '\0';
- header->header.linkflag = LF_SYMLINK;
- finish_header(header); /* Nothing more to do to it */
- }
- break;
- #endif
-
- case S_IFDIR: /* Directory */
- {
- register DIR *dirp;
- register struct direct *d;
- static char namebuf[NAMSIZ+2];
- register int len;
- int our_device = hstat.st_dev;
-
- /* Build new prototype name */
- strncpy(namebuf, p, sizeof (namebuf));
- len = strlen(namebuf);
- while (len >= 1 && '/' == namebuf[len-1])
- len--; /* Delete trailing slashes */
- #ifdef AMIGA
- if (len && namebuf[len-1] != ':')
- namebuf[len++] = '/';
- #else
- namebuf[len++] = '/'; /* Now add exactly one back */
- #endif
- namebuf[len] = '\0'; /* Make sure null-terminated */
-
- /*
- * Output directory header record with permissions
- * FIXME, do this AFTER files, to avoid R/O dir problems?
- * If old archive format, don't write record at all.
- */
- if (!f_oldarch) {
- hstat.st_size = 0; /* Force 0 size on dir */
- /*
- * If people could really read standard archives,
- * this should be: (FIXME)
- header = start_header(f_standard? p: namebuf, &hstat);
- * but since they'd interpret LF_DIR records as
- * regular files, we'd better put the / on the name.
- */
- header = start_header(namebuf, &hstat);
- if (header == NULL)
- goto badfile; /* eg name too long */
-
- if (f_gnudump)
- header->header.linkflag = LF_DUMPDIR;
- else if (f_standard)
- header->header.linkflag = LF_DIR;
-
- /* If we're gnudumping, we aren't done yet so don't close it. */
- if(!f_gnudump)
- finish_header(header); /* Done with directory header */
- }
-
- /* Hack to remove "./" from the front of all the file names */
- if (len == 2 && namebuf[0] == '.' && namebuf[1]=='/') {
- len = 0;
- }
-
- if(f_gnudump) {
- int sizeleft;
- int totsize;
- int bufsize;
- union record *start;
- int count;
- char *buf,*p_buf;
-
- buf=gnu_list_name->dir_contents; /* FOO */
- totsize=0;
- for(p_buf=buf;p_buf && *p_buf;) {
- int tmp;
-
- tmp=strlen(p_buf)+1;
- totsize+=tmp;
- p_buf+=tmp;
- }
- totsize++;
- to_oct((long)totsize,1+12,header->header.size);
- finish_header(header);
- p_buf=buf;
- sizeleft=totsize;
- while(sizeleft>0) {
- if(f_multivol) {
- save_name=p;
- save_sizeleft=sizeleft;
- save_totsize=totsize;
- }
- start=findrec();
- bufsize=endofrecs()->charptr - start->charptr;
- if(sizeleft<bufsize) {
- bufsize=sizeleft;
- count=bufsize%RECORDSIZE;
- if(count)
- bzero(start->charptr+sizeleft,RECORDSIZE-count);
- }
- bcopy(p_buf,start->charptr,bufsize);
- sizeleft-=bufsize;
- p_buf+=bufsize;
- userec(start+(bufsize-1)/RECORDSIZE);
- }
- if(f_multivol)
- save_name = 0;
- break;
- }
-
- /* Now output all the files in the directory */
- /* if (f_dironly)
- break; /* Unless the cmdline said not to */
-
-
- errno = 0;
- dirp = opendir(p);
- if (!dirp) {
- if (errno) {
- msg_perror ("can't open directory %s",p);
- } else {
- msg("error opening directory %s",
- p);
- }
- break;
- }
-
- /* Should speed this up by cd-ing into the dir, FIXME */
- while (NULL != (d=readdir(dirp))) {
- /* Skip . and .. */
- if(is_dot_or_dotdot(d->d_name))
- continue;
-
- if (DP_NAMELEN(d) + len >= NAMSIZ) {
- namebuf[len]='\0';
- msg("file name %s%s too long\n",
- namebuf, d->d_name);
- continue;
- }
- strcpy(namebuf+len, d->d_name);
- if(f_exclude && check_exclude(namebuf))
- continue;
- dump_file(namebuf, our_device);
- }
-
- closedir(dirp);
- }
- break;
-
- #ifdef S_IFCHR
- case S_IFCHR: /* Character special file */
- type = LF_CHR;
- goto easy;
- #endif
-
- #ifdef S_IFBLK
- case S_IFBLK: /* Block special file */
- type = LF_BLK;
- goto easy;
- #endif
-
- #ifdef S_IFIFO
- case S_IFIFO: /* Fifo special file */
-
- type = LF_FIFO;
- goto easy;
- #endif
-
- #ifdef S_IFSOCK
- case S_IFSOCK: /* Socket pretend its a fifo? */
- type = LF_FIFO;
- goto easy;
- #endif
-
- easy:
- if (!f_standard) goto unknown;
-
- hstat.st_size = 0; /* Force 0 size */
- header = start_header(p, &hstat);
- if (header == NULL) goto badfile; /* eg name too long */
-
- header->header.linkflag = type;
- if (type != LF_FIFO) {
- to_oct((long) major(hstat.st_rdev), 8,
- header->header.devmajor);
- to_oct((long) minor(hstat.st_rdev), 8,
- header->header.devminor);
- }
-
- finish_header(header);
- break;
-
- default:
- unknown:
- msg("%s: Unknown file type; file ignored.\n", p);
- break;
- }
- }
-
- int
- finish_sparse_file(fd, sizeleft, fullsize, name)
- int fd;
- long *sizeleft,
- fullsize;
- char *name;
- {
- union record *start;
- static char tempbuf[RECORDSIZE];
- int bufsize,
- sparse_ind = 0,
- count;
- long pos;
-
-
-
- while (*sizeleft > 0) {
- start = findrec();
- bzero(start->charptr, RECORDSIZE);
- bufsize = sparsearray[sparse_ind].numbytes;
- if (!bufsize) { /* we blew it, maybe */
- msg("Wrote %ld of %ld bytes to file %s",
- fullsize - *sizeleft, fullsize, name);
- break;
- }
- pos = lseek(fd, sparsearray[sparse_ind++].offset, 0);
- /*
- * If the number of bytes to be written here exceeds
- * the size of the temporary buffer, do it in steps.
- */
- while (bufsize > RECORDSIZE) {
- /* if (amt_read) {
- count = read(fd, start->charptr+amt_read, RECORDSIZE-amt_read);
- bufsize -= RECORDSIZE - amt_read;
- amt_read = 0;
- userec(start);
- start = findrec();
- bzero(start->charptr, RECORDSIZE);
- }*/
- /* store the data */
- count = read(fd, start->charptr, RECORDSIZE);
- if (count < 0) {
- msg_perror("read error at byte %ld, reading %d bytes, in file %s",
- fullsize - *sizeleft, bufsize, name);
- return 1;
- }
- bufsize -= count;
- *sizeleft -= count;
- userec(start);
- start = findrec();
- bzero(start->charptr, RECORDSIZE);
- }
-
-
- clear_buffer(tempbuf);
- count = read(fd, tempbuf, bufsize);
- bcopy(tempbuf, start->charptr, RECORDSIZE);
- if (count < 0) {
- msg_perror("read error at byte %ld, reading %d bytes, in file %s",
- fullsize - *sizeleft, bufsize, name);
- return 1;
- }
- /* if (amt_read >= RECORDSIZE) {
- amt_read = 0;
- userec(start+(count-1)/RECORDSIZE);
- if (count != bufsize) {
- msg("file %s shrunk by %d bytes, padding with zeros.\n", name, sizeleft);
- return 1;
- }
- start = findrec();
- } else
- amt_read += bufsize;*/
- *sizeleft -= count;
- userec(start);
-
- }
- free(sparsearray);
- /* userec(start+(count-1)/RECORDSIZE);*/
- return 0;
-
- }
-
- init_sparsearray()
- {
- register int i;
-
- sp_array_size = 10;
- /*
- * Make room for our scratch space -- initially is 10 elts long
- */
- sparsearray = (struct sp_array *) malloc(sp_array_size * sizeof(struct sp_array));
- for (i = 0; i < sp_array_size; i++) {
- sparsearray[i].offset = 0;
- sparsearray[i].numbytes = 0;
- }
- }
-
-
-
- /*
- * Okay, we've got a sparse file on our hands -- now, what we need to do is
- * make a pass through the file and carefully note where any data is, i.e.,
- * we want to find how far into the file each instance of data is, and how
- * many bytes are there. We store this information in the sparsearray,
- * which will later be translated into header information. For now, we use
- * the sparsearray as convenient storage.
- *
- * As a side note, this routine is a mess. If I could have found a cleaner
- * way to do it, I would have. If anyone wants to find a nicer way to do
- * this, feel free.
- */
- int
- deal_with_sparse(name, header, nulls_at_end)
- char *name;
- union record *header;
-
- {
- long numbytes = 0;
- long offset = 0;
- long save_offset;
- int fd;
- int start,
- end;
- int end_nulls = 0;
- int current_size = hstat.st_size;
- int sparse_ind = 0,
- cc;
- static char buf[RECORDSIZE];
- int read_last_data = 0; /* did we just read the last record? */
- int amidst_data = 0;
-
- header->header.isextended = 0;
- /*
- * Can't open the file -- this problem will be caught later on,
- * so just return.
- */
- if ((fd = open(name, O_RDONLY)) < 0)
- return;
-
- init_sparsearray();
- clear_buffer(buf);
-
- while ((cc = read(fd, buf, sizeof buf)) != 0) {
-
- if (sparse_ind > sp_array_size-1) {
-
- /*
- * realloc the scratch area, since we've run out of room --
- */
- sparsearray = (struct sp_array *)
- realloc(sparsearray,
- 2 * sp_array_size * (sizeof(struct sp_array)));
- sp_array_size *= 2;
- }
- if (cc == sizeof buf) {
- if (zero_record(buf)) {
- if (amidst_data) {
- sparsearray[sparse_ind++].numbytes
- = numbytes;
- amidst_data = 0;
- numbytes = 0;
- }
- offset += cc;
- } else { /* !zero_record(buf) */
- if (!amidst_data) {
- amidst_data = 1;
- where_is_data(&start, &end, buf);
- numbytes += end - start;
- offset += start;
- sparsearray[sparse_ind].offset = offset;
- } else
- numbytes += cc;
- offset += cc;
- }
- } else if (cc < sizeof buf) {
- if (!zero_record(buf)) {
- if (!amidst_data) {
- amidst_data = 1;
- where_is_data(&start, &end, buf);
- /* In case there are nulls at the
- end that we need to remember */
- if (end < cc)
- end = cc;
- numbytes += start - end;
- offset += start;
- /* end_nulls = RECORDSIZE - end;*/
- } else {
- numbytes += cc;
- /* end_nulls = RECORDSIZE - end;*/
- }
- sparsearray[sparse_ind].numbytes = numbytes;
- } /* else
- end_nulls = cc;*/
- }
- clear_buffer(buf);
- }
- if (numbytes)
- sparsearray[sparse_ind].numbytes = numbytes;
- close(fd);
- /* printf("%d\n", end_nulls);
- *nulls_at_end = end_nulls;*/
-
- return sparse_ind;
- }
-
- /*
- * Just zeroes out the buffer so we don't confuse ourselves with leftover
- * data.
- */
- clear_buffer(buf)
- char *buf;
- {
- register int i;
-
- for (i = 0; i < RECORDSIZE; i++)
- buf[i] = '\0';
- }
-
- /*
- * JK -
- * This routine takes a character array, and tells where within that array
- * the data can be found. It skips over any zeros, and sets the first
- * non-zero point in the array to be the "start", and continues until it
- * finds non-data again, which is marked as the "end." This routine is
- * mainly for 1) seeing how far into a file we must lseek to data, given
- * that we have a sparse file, and 2) determining the "real size" of the
- * file, i.e., the number of bytes in the sparse file that are data, as
- * opposed to the zeros we are trying to skip.
- */
- where_is_data(from, to, buffer)
- int *from,
- *to;
- char *buffer;
- {
- register int i = 0;
- register int save_to = *to;
- int amidst_data = 0;
-
-
- while (!buffer[i])
- i++;
- *from = i;
-
- if (*from < 16) /* don't bother */
- *from = 0;
- /* keep going to make sure there isn't more real
- data in this record */
- while (i < RECORDSIZE) {
- if (!buffer[i]) {
- if (amidst_data) {
- save_to = i;
- amidst_data = 0;
- }
- i++;
- }
- else if (buffer[i]) {
- if (!amidst_data)
- amidst_data = 1;
- i++;
- }
- }
- if (i == RECORDSIZE)
- *to = i;
- else
- *to = save_to;
-
- }
-
- /*
- * Takes a recordful of data and basically cruises through it to see if
- * it's made *entirely* of zeros, returning a 0 the instant it finds
- * something that is a non-zero, i.e., useful data.
- */
- zero_record(buffer)
- char *buffer;
- {
- register int i;
-
- for (i = 0; i < RECORDSIZE; i++)
- if (buffer[i] != '\000')
- return 0;
- return 1;
- }
-
- find_new_file_size(filesize, highest_index)
- int *filesize;
- int highest_index;
- {
- register int i;
-
- *filesize = 0;
- for (i = 0; sparsearray[i].numbytes && i <= highest_index; i++)
- *filesize += sparsearray[i].numbytes;
- }
-
- /*
- * Make a header block for the file name whose stat info is st .
- * Return header pointer for success, NULL if the name is too long.
- */
- union record *
- start_header(name, st)
- char *name;
- register struct stat *st;
- {
- register union record *header;
-
- header = (union record *) findrec();
- bzero(header->charptr, sizeof(*header)); /* XXX speed up */
-
- /*
- * Check the file name and put it in the record.
- */
- if(!f_absolute_paths) {
- static int warned_once = 0;
- #ifdef MSDOS
- if(name[1]==':') {
- name+=2;
- if(!warned_once++)
- msg("Removing drive spec from names in the archive");
- }
- #endif
- while ('/' == *name) {
- name++; /* Force relative path */
- if (!warned_once++)
- msg("Removing leading / from absolute path names in the archive.");
- }
- }
- strcpy(header->header.name, name);
- if (header->header.name[NAMSIZ-1]) {
- msg("%s: name too long\n", name);
- return NULL;
- }
-
- to_oct((long) (st->st_mode & ~S_IFMT),
- 8, header->header.mode);
- to_oct((long) st->st_uid, 8, header->header.uid);
- to_oct((long) st->st_gid, 8, header->header.gid);
- to_oct((long) st->st_size, 1+12, header->header.size);
- to_oct((long) st->st_mtime, 1+12, header->header.mtime);
- /* header->header.linkflag is left as null */
- if(f_gnudump) {
- to_oct((long) st->st_atime, 1+12, header->header.atime);
- to_oct((long) st->st_ctime, 1+12, header->header.ctime);
- }
-
- #ifndef NONAMES
- /* Fill in new Unix Standard fields if desired. */
- if (f_standard) {
- header->header.linkflag = LF_NORMAL; /* New default */
- strcpy(header->header.magic, TMAGIC); /* Mark as Unix Std */
- finduname(header->header.uname, st->st_uid);
- findgname(header->header.gname, st->st_gid);
- }
- #endif
- return header;
- }
-
- /*
- * Finish off a filled-in header block and write it out.
- * We also print the file name and/or full info if verbose is on.
- */
- void
- finish_header(header)
- register union record *header;
- {
- register int i, sum;
- register char *p;
- void bcopy();
-
- bcopy(CHKBLANKS, header->header.chksum, sizeof(header->header.chksum));
-
- sum = 0;
- p = header->charptr;
- for (i = sizeof(*header); --i >= 0; ) {
- /*
- * We can't use unsigned char here because of old compilers,
- * e.g. V7.
- */
- sum += 0xFF & *p++;
- }
-
- /*
- * Fill in the checksum field. It's formatted differently
- * from the other fields: it has [6] digits, a null, then a
- * space -- rather than digits, a space, then a null.
- * We use to_oct then write the null in over to_oct's space.
- * The final space is already there, from checksumming, and
- * to_oct doesn't modify it.
- *
- * This is a fast way to do:
- * (void) sprintf(header->header.chksum, "%6o", sum);
- */
- to_oct((long) sum, 8, header->header.chksum);
- header->header.chksum[6] = '\0'; /* Zap the space */
-
- userec(header);
-
- if (f_verbose) {
- /* These globals are parameters to print_header, sigh */
- head = header;
- /* hstat is already set up */
- head_standard = f_standard;
- print_header();
- }
-
- return;
- }
-
-
- /*
- * Quick and dirty octal conversion.
- * Converts long "value" into a "digs"-digit field at "where",
- * including a trailing space and room for a null. "digs"==3 means
- * 1 digit, a space, and room for a null.
- *
- * We assume the trailing null is already there and don't fill it in.
- * This fact is used by start_header and finish_header, so don't change it!
- *
- * This should be equivalent to:
- * (void) sprintf(where, "%*lo ", digs-2, value);
- * except that sprintf fills in the trailing null and we don't.
- */
- void
- to_oct(value, digs, where)
- register long value;
- register int digs;
- register char *where;
- {
-
- --digs; /* Trailing null slot is left alone */
- where[--digs] = ' '; /* Put in the space, though */
-
- /* Produce the digits -- at least one */
- do {
- where[--digs] = '0' + (char)(value & 7); /* one octal digit */
- value >>= 3;
- } while (digs > 0 && value != 0);
-
- /* Leading spaces, if necessary */
- while (digs > 0)
- where[--digs] = ' ';
-
- }
-
-
- /*
- * Write the EOT record(s).
- * We actually zero at least one record, through the end of the block.
- * Old tar writes garbage after two zeroed records -- and PDtar used to.
- */
- write_eot()
- {
- union record *p;
- int bufsize;
- void bzero();
-
- p = findrec();
- bufsize = endofrecs()->charptr - p->charptr;
- bzero(p->charptr, bufsize);
- userec(p);
- }
-