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- /* Create a tar archive.
- Copyright (C) 1985, 1992, 1993 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 2, 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.
- */
-
- /* changed for SAS/C amiga port with #ifdefs by Andreas R. Kleinert,
- 19 Apr 1996
- */
-
- #ifdef _AIX
- #pragma alloca
- #endif
- #include <sys/types.h>
- #include <stdio.h>
- #include <errno.h>
- #ifndef STDC_HEADERS
- extern int errno;
- #endif
-
- #ifdef BSD42
- #include <sys/file.h>
- #else
- #ifndef V7
- #include <fcntl.h>
- #endif
- #endif
-
- #include "tar.h"
- #include "port.h"
-
- #ifndef __MSDOS__
- #include <pwd.h>
- #include <grp.h>
- #endif
-
- #if defined (_POSIX_VERSION)
- #include <utime.h>
- #else
- struct utimbuf
- {
- long actime;
- long modtime;
- };
-
- #endif
-
- extern struct stat hstat; /* Stat struct corresponding */
-
- #ifndef __MSDOS__
- extern dev_t ar_dev;
- extern ino_t ar_ino;
- #endif
-
- /* JF */
- extern struct name *gnu_list_name;
-
- /*
- * If there are no symbolic links, there is no lstat(). Use stat().
- */
- #ifndef S_ISLNK
- #define lstat stat
- #endif
-
- extern void print_header ();
-
- union record *start_header ();
- void blank_name_list ();
- int check_exclude ();
- PTR ck_malloc ();
- PTR ck_realloc ();
- void clear_buffer ();
- void close_archive ();
- void collect_and_sort_names ();
- int confirm ();
- int deal_with_sparse ();
- void find_new_file_size ();
- void finish_header ();
- int finish_sparse_file ();
- void finduname ();
- void findgname ();
- int is_dot_or_dotdot ();
- void open_archive ();
- char *name_next ();
- void name_close ();
- void to_oct ();
- void dump_file ();
- void write_dir_file ();
- void write_eot ();
- void write_long ();
- int zero_record ();
-
- /* This code moved from tar.h since create.c is the only file that cares
- about 'struct link's. This means that other files might not have to
- include sys/types.h any more. */
-
- struct link
- {
- struct link *next;
- dev_t dev;
- ino_t ino;
- short linkcount;
- char name[1];
- };
-
- struct link *linklist; /* Points to first link in list */
-
- 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 = ck_malloc (PATH_MAX);
- char *q, *bufp;
-
- collect_and_sort_names ();
-
- while (p = name_from_list ())
- dump_file (p, -1, 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, 1);
- }
- }
- }
- /* } */
- free (buf);
- }
- else
- {
- while (p = name_next (1))
- dump_file (p, -1, 1);
- }
-
- write_eot ();
- close_archive ();
- if (f_gnudump)
- write_dir_file ();
- 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, toplevel)
- char *p; /* File name to dump */
- int curdev; /* Device our parent dir was on */
- int toplevel; /* Whether we are a toplevel call */
- {
- 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 critical_error = 0;
- struct utimbuf restore_times;
- /* 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.
- */
- #ifdef STX_HIDDEN /* AIX */
- if (0 != f_follow_links ?
- statx (p, &hstat, STATSIZE, STX_HIDDEN) :
- statx (p, &hstat, STATSIZE, STX_HIDDEN | STX_LINK))
- #else
- if (0 != f_follow_links ? stat (p, &hstat) : lstat (p, &hstat))
- #endif
- {
- badperror:
- msg_perror ("can't add file %s", p);
- badfile:
- if (!f_ignore_failed_read || critical_error)
- errors++;
- return;
- }
-
- restore_times.actime = hstat.st_atime;
- restore_times.modtime = hstat.st_mtime;
-
- #ifdef S_ISHIDDEN
- if (S_ISHIDDEN (hstat.st_mode))
- {
- char *new = (char *) alloca (strlen (p) + 2);
- if (new)
- {
- strcpy (new, p);
- strcat (new, "@");
- p = new;
- }
- }
- #endif
-
- /* 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
- && !S_ISDIR (hstat.st_mode)
- && (f_new_files > 1 || new_time > hstat.st_ctime))
- {
- if (curdev == -1)
- {
- msg ("%s: is unchanged; not dumped", p);
- }
- return;
- }
-
- #ifndef __MSDOS__
- /* 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;
- }
- #endif
- /*
- * 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
- && (S_ISREG (hstat.st_mode)
- #ifdef S_ISCTG
- || S_ISCTG (hstat.st_mode)
- #endif
- #ifdef S_ISCHR
- || S_ISCHR (hstat.st_mode)
- #endif
- #ifdef S_ISBLK
- || S_ISBLK (hstat.st_mode)
- #endif
- #ifdef S_ISFIFO
- || S_ISFIFO (hstat.st_mode)
- #endif
- ))
- {
- register struct link *lp;
-
- /* 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. */
- while (!f_absolute_paths && *link_name == '/')
- {
- static int link_warn = 0;
-
- if (!link_warn)
- {
- msg ("Removing leading / from absolute links");
- link_warn++;
- }
- link_name++;
- }
- if (link_name - lp->name >= NAMSIZ)
- write_long (link_name, LF_LONGLINK);
- current_link_name = link_name;
-
- hstat.st_size = 0;
- header = start_header (p, &hstat);
- if (header == NULL)
- {
- critical_error = 1;
- goto badfile;
- }
- strncpy (header->header.arch_linkname,
- link_name, NAMSIZ);
-
- /* Force null truncated */
- header->header.arch_linkname[NAMSIZ - 1] = 0;
-
- header->header.linkflag = LF_LINK;
- finish_header (header);
- /* FIXME: Maybe remove from list after all links found? */
- if (f_remove_files)
- {
- if (unlink (p) == -1)
- msg_perror ("cannot remove %s", p);
- }
- return; /* We dumped it */
- }
- }
-
- /* Not found. Add it to the list of possible links. */
- lp = (struct link *) ck_malloc ((unsigned) (sizeof (struct link) + strlen (p)));
- 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.
- */
- if (S_ISREG (hstat.st_mode)
- #ifdef S_ISCTG
- || S_ISCTG (hstat.st_mode)
- #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.
- */
- #ifdef hpux /* Nice of HPUX to gratuitiously change it, huh? - mib */
- if (hstat.st_size - (hstat.st_blocks * 1024) > 1024)
- #else
- if (hstat.st_size - (hstat.st_blocks * RECORDSIZE) > RECORDSIZE)
- #endif
- {
- int filesize = hstat.st_size;
- register int i;
-
- header = start_header (p, &hstat);
- if (header == NULL)
- {
- critical_error = 1;
- 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);
- 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);
- critical_error = 1;
- goto badfile;
- }
- }
- #ifdef S_ISCTG
- /* Mark contiguous files, if we support them */
- if (f_standard && S_ISCTG (hstat.st_mode))
- {
- 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)
- {
- critical_error = 1;
- 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.", p, sizeleft);
- goto padit; /* Short read */
- }
-
- if (f_multivol)
- save_name = 0;
-
- if (f >= 0)
- (void) close (f);
-
- if (f_remove_files)
- {
- if (unlink (p) == -1)
- msg_perror ("cannot remove %s", p);
- }
- if (f_atime_preserve)
- utime (p, &restore_times);
- return;
-
- /*
- * 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);
- if (f_atime_preserve)
- utime (p, &restore_times);
- return;
- }
-
- #ifdef S_ISLNK
- else if (S_ISLNK (hstat.st_mode))
- {
- int size;
- char *buf = alloca (PATH_MAX + 1);
-
- size = readlink (p, buf, PATH_MAX + 1);
- if (size < 0)
- goto badperror;
- buf[size] = '\0';
- if (size >= NAMSIZ)
- write_long (buf, LF_LONGLINK);
- current_link_name = buf;
-
- hstat.st_size = 0; /* Force 0 size on symlink */
- header = start_header (p, &hstat);
- if (header == NULL)
- {
- critical_error = 1;
- goto badfile;
- }
- strncpy (header->header.arch_linkname, buf, NAMSIZ);
- header->header.arch_linkname[NAMSIZ - 1] = '\0';
- header->header.linkflag = LF_SYMLINK;
- finish_header (header); /* Nothing more to do to it */
- if (f_remove_files)
- {
- if (unlink (p) == -1)
- msg_perror ("cannot remove %s", p);
- }
- return;
- }
- #endif
-
- else if (S_ISDIR (hstat.st_mode))
- {
- register DIR *dirp;
- register struct dirent *d;
- char *namebuf;
- int buflen;
- register int len;
- int our_device = hstat.st_dev;
-
- /* Build new prototype name */
- len = strlen (p);
- buflen = len + NAMSIZ;
- namebuf = ck_malloc (buflen + 1);
- strncpy (namebuf, p, buflen);
- 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)
- {
- critical_error = 1;
- 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 */
- }
-
- 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;
- if (f_atime_preserve)
- utime (p, &restore_times);
- return;
- }
-
- /* Now output all the files in the directory */
- #if 0
- if (f_dironly)
- return; /* Unless the cmdline said not to */
- #endif
- /*
- * 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 && !toplevel && curdev != hstat.st_dev)
- {
- if (f_verbose)
- msg ("%s: is on a different filesystem; not dumped", p);
- return;
- }
-
-
- errno = 0;
- dirp = opendir (p);
- if (!dirp)
- {
- if (errno)
- {
- msg_perror ("can't open directory %s", p);
- }
- else
- {
- msg ("error opening directory %s",
- p);
- }
- return;
- }
-
- /* Hack to remove "./" from the front of all the file names */
- if (len == 2 && namebuf[0] == '.' && namebuf[1] == '/')
- len = 0;
-
- /* 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 (NLENGTH (d) + len >= buflen)
- {
- buflen = len + NLENGTH (d);
- namebuf = ck_realloc (namebuf, buflen + 1);
- /* namebuf[len]='\0';
- msg("file name %s%s too long",
- namebuf, d->d_name);
- continue; */
- }
- strcpy (namebuf + len, d->d_name);
- if (f_exclude && check_exclude (namebuf))
- continue;
- dump_file (namebuf, our_device, 0);
- }
-
- closedir (dirp);
- free (namebuf);
- if (f_atime_preserve)
- utime (p, &restore_times);
- return;
- }
-
- #ifdef S_ISCHR
- else if (S_ISCHR (hstat.st_mode))
- {
- type = LF_CHR;
- }
- #endif
-
- #ifdef S_ISBLK
- else if (S_ISBLK (hstat.st_mode))
- {
- type = LF_BLK;
- }
- #endif
-
- /* Avoid screwy apollo lossage where S_IFIFO == S_IFSOCK */
- #if (_ISP__M68K == 0) && (_ISP__A88K == 0) && defined(S_ISFIFO)
- else if (S_ISFIFO (hstat.st_mode))
- {
- type = LF_FIFO;
- }
- #endif
-
- #ifdef S_ISSOCK
- else if (S_ISSOCK (hstat.st_mode))
- {
- type = LF_FIFO;
- }
- #endif
- else
- goto unknown;
-
- if (!f_standard)
- goto unknown;
-
- hstat.st_size = 0; /* Force 0 size */
- header = start_header (p, &hstat);
- if (header == NULL)
- {
- critical_error = 1;
- goto badfile; /* eg name too long */
- }
-
- header->header.linkflag = type;
- #if defined(S_IFBLK) || defined(S_IFCHR)
- 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);
- }
- #endif
-
- finish_header (header);
- if (f_remove_files)
- {
- if (unlink (p) == -1)
- msg_perror ("cannot remove %s", p);
- }
- return;
-
- unknown:
- msg ("%s: Unknown file type; file ignored.", p);
- }
-
- int
- finish_sparse_file (fd, sizeleft, fullsize, name)
- int fd;
- long *sizeleft, fullsize;
- char *name;
- {
- union record *start;
- char tempbuf[RECORDSIZE];
- int bufsize, sparse_ind = 0, count;
- long pos;
- long nwritten = 0;
-
-
- 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);
- nwritten += RECORDSIZE; /* XXX */
- 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.", name, sizeleft);
- return 1;
- }
- start = findrec();
- } else
- amt_read += bufsize;*/
- nwritten += count; /* XXX */
- *sizeleft -= count;
- userec (start);
-
- }
- free (sparsearray);
- /* printf ("Amount actually written is (I hope) %d.\n", nwritten); */
- /* userec(start+(count-1)/RECORDSIZE);*/
- return 0;
-
- }
-
- void
- init_sparsearray ()
- {
- register int i;
-
- sp_array_size = 10;
- /*
- * Make room for our scratch space -- initially is 10 elts long
- */
- sparsearray = (struct sp_array *) ck_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.
- */
-
- /* There is little point in trimming small amounts of null data at the */
- /* head and tail of blocks -- it's ok if we only avoid dumping blocks */
- /* of complete null data */
- int
- deal_with_sparse (name, header, nulls_at_end)
- char *name;
- union record *header;
- int nulls_at_end;
- {
- long numbytes = 0;
- long offset = 0;
- /* long save_offset;*/
- int fd;
- /* int current_size = hstat.st_size;*/
- int sparse_ind = 0, cc;
- char buf[RECORDSIZE];
- #if 0
- int read_last_data = 0; /* did we just read the last record? */
- #endif
- 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 0;
-
- 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 *)
- ck_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;
- }
- }
- else
- { /* !zero_record(buf) */
- if (amidst_data)
- numbytes += cc;
- else
- {
- amidst_data = 1;
- numbytes = cc;
- sparsearray[sparse_ind].offset
- = offset;
- }
- }
- }
- else if (cc < sizeof buf)
- {
- /* This has to be the last bit of the file, so this */
- /* is somewhat shorter than the above. */
- if (!zero_record (buf))
- {
- if (!amidst_data)
- {
- amidst_data = 1;
- numbytes = cc;
- sparsearray[sparse_ind].offset
- = offset;
- }
- else
- numbytes += cc;
- }
- }
- offset += cc;
- clear_buffer (buf);
- }
- if (amidst_data)
- sparsearray[sparse_ind++].numbytes = numbytes;
- else
- {
- sparsearray[sparse_ind].offset = offset-1;
- sparsearray[sparse_ind++].numbytes = 1;
- }
- close (fd);
-
- return sparse_ind - 1;
- }
-
- /*
- * Just zeroes out the buffer so we don't confuse ourselves with leftover
- * data.
- */
- void
- clear_buffer (buf)
- char *buf;
- {
- register int i;
-
- for (i = 0; i < RECORDSIZE; i++)
- buf[i] = '\0';
- }
-
- #if 0 /* I'm leaving this as a monument to Joy Kendall, who wrote it -mib */
- /*
- * 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;
-
- }
-
- #endif
-
- /* Note that this routine is only called if zero_record returned true */
- #if 0 /* But we actually don't need it at all. */
- where_is_data (from, to, buffer)
- int *from, *to;
- char *buffer;
- {
- char *fp, *tp;
-
- for (fp = buffer; !*fp; fp++)
- ;
- for (tp = buffer + RECORDSIZE - 1; !*tp; tp--)
- ;
- *from = fp - buffer;
- *to = tp - buffer + 1;
- }
-
- #endif
-
-
-
- /*
- * 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.
- */
- int
- zero_record (buffer)
- char *buffer;
- {
- register int i;
-
- for (i = 0; i < RECORDSIZE; i++)
- if (buffer[i] != '\000')
- return 0;
- return 1;
- }
-
- void
- 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;
-
- if (strlen (name) >= NAMSIZ)
- write_long (name, LF_LONGNAME);
-
- 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.");
- }
- }
- current_file_name = name;
- strncpy (header->header.arch_name, name, NAMSIZ);
- header->header.arch_name[NAMSIZ - 1] = '\0';
-
- to_oct ((long) (f_oldarch ? (st->st_mode & 07777) : st->st_mode),
- 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;
-
- 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)
- {
- extern union record *head;/* Points to current tape header */
- extern int head_standard; /* Tape header is in ANSI format */
-
- /* 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.
- */
- void
- write_eot ()
- {
- union record *p;
- int bufsize;
-
- p = findrec ();
- if (p)
- {
- bufsize = endofrecs ()->charptr - p->charptr;
- bzero (p->charptr, bufsize);
- userec (p);
- }
- }
-
- /* Write a LF_LONGLINK or LF_LONGNAME record. */
- void
- write_long (p, type)
- char *p;
- char type;
- {
- int size = strlen (p) + 1;
- int bufsize;
- union record *header;
- struct stat foo;
-
-
- bzero (&foo, sizeof foo);
- foo.st_size = size;
-
- header = start_header ("././@LongLink", &foo);
- header->header.linkflag = type;
- finish_header (header);
-
- header = findrec ();
-
- bufsize = endofrecs ()->charptr - header->charptr;
-
- while (bufsize < size)
- {
- bcopy (p, header->charptr, bufsize);
- p += bufsize;
- size -= bufsize;
- userec (header + (bufsize - 1) / RECORDSIZE);
- header = findrec ();
- bufsize = endofrecs ()->charptr - header->charptr;
- }
- bcopy (p, header->charptr, size);
- bzero (header->charptr + size, bufsize - size);
- userec (header + (size - 1) / RECORDSIZE);
- }
-