/* 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. */ #ifndef lint static char rcsid[] = "$Id: create.c,v 1.4 1993/08/02 17:48:40 mycroft Exp $"; #endif /* not lint */ /* * Create a tar archive. * * Written 25 Aug 1985 by John Gilmore, ihnp4!hoptoad!gnu. */ #ifdef _AIX #pragma alloca #endif #include #include #include #ifndef STDC_HEADERS extern int errno; #endif #ifdef BSD42 #include #else #ifndef V7 #include #endif #endif #include "tar.h" #include "port.h" #ifndef __MSDOS__ #include #include #endif #if defined (_POSIX_VERSION) #include #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); if (p[strlen (p) - 1] != '/') strcat (buf, "/"); 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 . * 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 */ namebuf[len++] = '/'; /* Now add exactly one back */ 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); }