X-Git-Url: https://git.dogcows.com/gitweb?a=blobdiff_plain;f=src%2Fcreate.c;h=d8145128b997fac06c7e4976e9c179825ee350f8;hb=f74454cb37c715674796f21a2fd75eb0a5a34002;hp=ed9f172719e2ef86cf744befb2475ed3e15597f0;hpb=1f568c6aa2335c95bd99413912dfa4a0689c6ca9;p=chaz%2Ftar diff --git a/src/create.c b/src/create.c index ed9f172..d814512 100644 --- a/src/create.c +++ b/src/create.c @@ -1,1346 +1,1582 @@ /* Create a tar archive. - Copyright (C) 1985, 1992 Free Software Foundation + Copyright 1985, 92, 93, 94, 96, 97, 1999 Free Software Foundation, Inc. + Written by John Gilmore, on 1985-08-25. -This file is part of GNU Tar. + This program 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 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. + This program 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. -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 this program; if not, write to the Free Software Foundation, Inc., + 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ -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. */ +#include "system.h" -/* - * 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; +#if !MSDOS +# include +# include #endif -#ifdef BSD42 -#include +#if HAVE_UTIME_H +# include #else -#ifndef V7 -#include -#endif -#endif - -#include "tar.h" -#include "port.h" - -#ifndef __MSDOS__ -#include -#include +struct utimbuf + { + long actime; + long modtime; + }; #endif -#if defined(_POSIX_VERSION) || defined(DIRENT) -#include -#ifdef direct -#undef direct -#endif /* direct */ -#define direct dirent -#define DP_NAMELEN(x) strlen((x)->d_name) -#endif /* _POSIX_VERSION or DIRENT */ -#if !defined(_POSIX_VERSION) && !defined(DIRENT) && defined(BSD42) -#include -#define DP_NAMELEN(x) (x)->d_namlen -#endif /* not _POSIX_VERSION and BSD42 */ -#ifdef __MSDOS__ -#include "msd_dir.h" -#define DP_NAMELEN(x) (x)->d_namlen -#define direct dirent -#endif -#if defined(USG) && !defined(_POSIX_VERSION) && !defined(DIRENT) -#include -#define DP_NAMELEN(x) strlen((x)->d_name) -#endif /* USG and not _POSIX_VERSION and not DIRENT */ +#include -extern struct stat hstat; /* Stat struct corresponding */ +#include "common.h" -#ifndef __MSDOS__ +#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 +/* This module is the only one that cares about `struct link's. */ + +struct link + { + struct link *next; + dev_t dev; + ino_t ino; + char name[1]; + }; + +static struct link *linklist; /* points to first link in list */ + +/* The maximum uintmax_t value that can be represented with DIGITS digits, + assuming that each digit is BITS_PER_DIGIT wide. */ +#define MAX_VAL_WITH_DIGITS(digits, bits_per_digit) \ + ((digits) * (bits_per_digit) < sizeof (uintmax_t) * CHAR_BIT \ + ? ((uintmax_t) 1 << ((digits) * (bits_per_digit))) - 1 \ + : (uintmax_t) -1) + +/* Convert VALUE to an octal representation suitable for tar headers. + Output to buffer WHERE with size SIZE. + The result is undefined if SIZE is 0 or if VALUE is too large to fit. */ + +static void +to_octal (uintmax_t value, char *where, size_t size) +{ + uintmax_t v = value; + size_t i = size; + + do + { + where[--i] = '0' + (v & ((1 << LG_8) - 1)); + v >>= LG_8; + } + while (i); +} -extern void print_header(); - -union record *start_header(); -void add_mangle(); -void add_symlink_mangle(); -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_mangled(); -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;*/ +/* Convert NEGATIVE VALUE to a base-256 representation suitable for + tar headers. NEGATIVE is 1 if VALUE was negative before being cast + to uintmax_t, 0 otherwise. Output to buffer WHERE with size SIZE. + The result is undefined if SIZE is 0 or if VALUE is too large to + fit. */ -void -create_archive() +static void +to_base256 (int negative, uintmax_t value, char *where, size_t size) { - 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 { - p = name_next(1); - do - dump_file(p, -1, 1); - while (p = name_next(1)); - } - - write_mangled(); - write_eot(); - close_archive(); - if(f_gnudump) - write_dir_file(); - name_close(); + uintmax_t v = value; + uintmax_t propagated_sign_bits = + ((uintmax_t) - negative << (CHAR_BIT * sizeof v - LG_256)); + size_t i = size; + + do + { + where[--i] = v & ((1 << LG_256) - 1); + v = propagated_sign_bits | (v >> LG_256); + } + while (i); } -/* - * 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 */ +/* Convert NEGATIVE VALUE (which was originally of size VALSIZE) to + external form, using SUBSTITUTE (...) if VALUE won't fit. Output + to buffer WHERE with size SIZE. NEGATIVE is 1 iff VALUE was + negative before being cast to uintmax_t; its original bitpattern + can be deduced from VALSIZE, its original size before casting. + TYPE is the kind of value being output (useful for diagnostics). + Prefer the POSIX format of SIZE - 1 octal digits (with leading zero + digits), followed by '\0'. If this won't work, and if GNU or + OLDGNU format is allowed, use '\200' followed by base-256, or (if + NEGATIVE is nonzero) '\377' followed by two's complement base-256. + If neither format works, use SUBSTITUTE (...) instead. Pass to + SUBSTITUTE the address of an 0-or-1 flag recording whether the + substitute value is negative. */ + +static void +to_chars (int negative, uintmax_t value, size_t valsize, + uintmax_t (*substitute) PARAMS ((int *)), + char *where, size_t size, const char *type) { - 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; - time_t restore_times[2]; -/* 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 + int base256_allowed = (archive_format == GNU_FORMAT + || archive_format == OLDGNU_FORMAT); + + /* Generate the POSIX octal representation if the number fits. */ + if (! negative && value <= MAX_VAL_WITH_DIGITS (size - 1, LG_8)) + { + where[size - 1] = '\0'; + to_octal (value, where, size - 1); + } + + /* Otherwise, generate the base-256 representation if we are + generating an old or new GNU format and if the number fits. */ + else if (((negative ? -1 - value : value) + <= MAX_VAL_WITH_DIGITS (size - 1, LG_256)) + && base256_allowed) + { + where[0] = negative ? -1 : 1 << (LG_256 - 1); + to_base256 (negative, value, where + 1, size - 1); + } + + /* Otherwise, if the number is negative, and if it would not cause + ambiguity on this host by confusing positive with negative + values, then generate the POSIX octal representation of the value + modulo 2**(field bits). The resulting tar file is + machine-dependent, since it depends on the host word size. Yuck! + But this is the traditional behavior. */ + else if (negative && valsize * CHAR_BIT <= (size - 1) * LG_8) + { + static int warned_once; + if (! warned_once) { -badperror: - msg_perror("can't add file %s",p); -badfile: - if (!f_ignore_failed_read || critical_error) - errors++; - return; + warned_once = 1; + WARN ((0, 0, _("Generating negative octal headers"))); } - - restore_times[0] = hstat.st_atime; - restore_times[1] = hstat.st_utime; - -#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; - } + where[size - 1] = '\0'; + to_octal (value & MAX_VAL_WITH_DIGITS (valsize * CHAR_BIT, 1), + where, size - 1); + } + + /* Otherwise, output a substitute value if possible (with a + warning), and an error message if not. */ + else + { + uintmax_t maxval = (base256_allowed + ? MAX_VAL_WITH_DIGITS (size - 1, LG_256) + : MAX_VAL_WITH_DIGITS (size - 1, LG_8)); + char valbuf[UINTMAX_STRSIZE_BOUND + 1]; + char maxbuf[UINTMAX_STRSIZE_BOUND]; + char minbuf[UINTMAX_STRSIZE_BOUND + 1]; + char const *minval_string; + char const *maxval_string = STRINGIFY_BIGINT (maxval, maxbuf); + char const *value_string; + + if (base256_allowed) + { + uintmax_t m = maxval + 1 ? maxval + 1 : maxval / 2 + 1; + char *p = STRINGIFY_BIGINT (m, minbuf + 1); + *--p = '-'; + minval_string = p; } -#endif + else + minval_string = "0"; - /* 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<0) { - msg("%s: is unchanged; not dumped",p); - } - return; + if (negative) + { + char *p = STRINGIFY_BIGINT (- value, valbuf + 1); + *--p = '-'; + value_string = p; } + else + value_string = STRINGIFY_BIGINT (value, valbuf); -#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. */ - hstat.st_size = 0; - header = start_header(p, &hstat); - if (header == NULL) - { - critical_error = 1; - 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++; - } - strncpy(header->header.linkname, - link_name,NAMSIZ); - if(header->header.linkname[NAMSIZ-1]) { - char *mangled; - extern char *find_mangled(); - - mangled=find_mangled(link_name); - msg("%s: link name too long: mangled to %s",link_name,mangled); - strncpy(header->header.linkname,mangled,NAMSIZ); - } - 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 *)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; + if (substitute) + { + int negsub; + uintmax_t sub = substitute (&negsub) & maxval; + uintmax_t s = (negsub &= archive_format == GNU_FORMAT) ? - sub : sub; + char subbuf[UINTMAX_STRSIZE_BOUND + 1]; + char *sub_string = STRINGIFY_BIGINT (s, subbuf + 1); + if (negsub) + *--sub_string = '-'; + WARN ((0, 0, _("value %s out of %s range %s..%s; substituting %s"), + value_string, type, minval_string, maxval_string, + sub_string)); + to_chars (negsub, s, valsize, 0, where, size, type); } + else + ERROR ((0, 0, _("value %s out of %s range %s..%s"), + value_string, type, minval_string, maxval_string)); + } +} - /* - * 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); - } - - } - } +static uintmax_t +gid_substitute (int *negative) +{ + gid_t r; +#ifdef GID_NOBODY + r = GID_NOBODY; #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; - } + static gid_t gid_nobody; + if (!gid_nobody && !gname_to_gid ("nobody", &gid_nobody)) + gid_nobody = -2; + r = gid_nobody; #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 */ - } + *negative = r < 0; + return r; +} - if(f_multivol) - save_name = 0; +void +gid_to_chars (gid_t v, char *p, size_t s) +{ + to_chars (v < 0, (uintmax_t) v, sizeof v, gid_substitute, p, s, "gid_t"); +} - if (f >= 0) - (void)close(f); +void +major_to_chars (major_t v, char *p, size_t s) +{ + to_chars (v < 0, (uintmax_t) v, sizeof v, 0, p, s, "major_t"); +} - if (f_remove_files) - { - if (unlink (p) == -1) - msg_perror ("cannot remove %s", p); - } - if (f_atime_preserve) - utime (p, restore_times); - return; +void +minor_to_chars (minor_t v, char *p, size_t s) +{ + to_chars (v < 0, (uintmax_t) v, sizeof v, 0, p, s, "minor_t"); +} - /* - * 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; - } +void +mode_to_chars (mode_t v, char *p, size_t s) +{ + /* In the common case where the internal and external mode bits are the same, + and we are not using POSIX or GNU format, + propagate all unknown bits to the external mode. + This matches historical practice. + Otherwise, just copy the bits we know about. */ + int negative; + uintmax_t u; + if (S_ISUID == TSUID && S_ISGID == TSGID && S_ISVTX == TSVTX + && S_IRUSR == TUREAD && S_IWUSR == TUWRITE && S_IXUSR == TUEXEC + && S_IRGRP == TGREAD && S_IWGRP == TGWRITE && S_IXGRP == TGEXEC + && S_IROTH == TOREAD && S_IWOTH == TOWRITE && S_IXOTH == TOEXEC + && archive_format != POSIX_FORMAT + && archive_format != GNU_FORMAT) + { + negative = v < 0; + u = v; + } + else + { + negative = 0; + u = ((v & S_ISUID ? TSUID : 0) + | (v & S_ISGID ? TSGID : 0) + | (v & S_ISVTX ? TSVTX : 0) + | (v & S_IRUSR ? TUREAD : 0) + | (v & S_IWUSR ? TUWRITE : 0) + | (v & S_IXUSR ? TUEXEC : 0) + | (v & S_IRGRP ? TGREAD : 0) + | (v & S_IWGRP ? TGWRITE : 0) + | (v & S_IXGRP ? TGEXEC : 0) + | (v & S_IROTH ? TOREAD : 0) + | (v & S_IWOTH ? TOWRITE : 0) + | (v & S_IXOTH ? TOEXEC : 0)); + } + to_chars (negative, u, sizeof v, 0, p, s, "mode_t"); +} -#ifdef S_ISLNK - else if(S_ISLNK(hstat.st_mode)) - { - int size; +void +off_to_chars (off_t v, char *p, size_t s) +{ + to_chars (v < 0, (uintmax_t) v, sizeof v, 0, p, s, "off_t"); +} - hstat.st_size = 0; /* Force 0 size on symlink */ - header = start_header(p, &hstat); - if (header == NULL) - { - critical_error = 1; - goto badfile; - } - size = readlink(p, header->header.linkname, NAMSIZ); - if (size < 0) goto badperror; - if (size == NAMSIZ) { - char *buf = ck_malloc(PATH_MAX); - - readlink(p,buf,PATH_MAX); - /* next_mangle(header->header.linkname); */ - add_symlink_mangle(buf,p,header->header.linkname); - msg("symbolic link %s too long: mangling to %s",p, header->header.linkname); - /* size=strlen(header->header.linkname); */ - free(buf); - } else - header->header.linkname[size] = '\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; - } +void +size_to_chars (size_t v, char *p, size_t s) +{ + to_chars (0, (uintmax_t) v, sizeof v, 0, p, s, "size_t"); +} + +void +time_to_chars (time_t v, char *p, size_t s) +{ + to_chars (v < 0, (uintmax_t) v, sizeof v, 0, p, s, "time_t"); +} + +static uintmax_t +uid_substitute (int *negative) +{ + uid_t r; +#ifdef UID_NOBODY + r = UID_NOBODY; +#else + static uid_t uid_nobody; + if (!uid_nobody && !uname_to_uid ("nobody", &uid_nobody)) + uid_nobody = -2; + r = uid_nobody; #endif + *negative = r < 0; + return r; +} - else if (S_ISDIR(hstat.st_mode)) - { - register DIR *dirp; - register struct direct *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 */ - } +void +uid_to_chars (uid_t v, char *p, size_t s) +{ + to_chars (v < 0, (uintmax_t) v, sizeof v, uid_substitute, p, s, "uid_t"); +} - 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(sizeleftcharptr+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; - } +void +uintmax_to_chars (uintmax_t v, char *p, size_t s) +{ + to_chars (0, v, sizeof v, 0, p, s, "uintmax_t"); +} + +/* Writing routines. */ - /* 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; - } +/*-----------------------------------------------------------------------. +| Just zeroes out the buffer so we don't confuse ourselves with leftover | +| data. | +`-----------------------------------------------------------------------*/ +static void +clear_buffer (char *buffer) +{ + memset (buffer, 0, BLOCKSIZE); +} - 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; - } +/*-------------------------------------------------------------------------. +| Write the EOT block(s). We zero at least two blocks, through | +| the end of the record. Old tar, as previous versions of GNU tar, writes | +| garbage after two zeroed blocks. | +`-------------------------------------------------------------------------*/ - /* 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 (DP_NAMELEN(d) + len >= buflen) { - buflen=len+DP_NAMELEN(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); - } +void +write_eot (void) +{ + union block *pointer = find_next_block (); + memset (pointer->buffer, 0, BLOCKSIZE); + set_next_block_after (pointer); + pointer = find_next_block (); + memset (pointer->buffer, 0, available_space_after (pointer)); + set_next_block_after (pointer); +} - closedir(dirp); - free(namebuf); - if (f_atime_preserve) - utime (p, restore_times); - return; - } +/*-----------------------------------------------------. +| Write a GNUTYPE_LONGLINK or GNUTYPE_LONGNAME block. | +`-----------------------------------------------------*/ -#ifdef S_ISCHR - else if (S_ISCHR(hstat.st_mode)) { - type = LF_CHR; - } -#endif +/* FIXME: Cross recursion between start_header and write_long! */ -#ifdef S_ISBLK - else if (S_ISBLK(hstat.st_mode)) { - type = LF_BLK; - } -#endif +static union block *start_header PARAMS ((const char *, struct stat *)); -/* 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 +static void +write_long (const char *p, char type) +{ + size_t size = strlen (p) + 1; + size_t bufsize; + union block *header; + struct stat foo; + + memset (&foo, 0, sizeof foo); + foo.st_size = size; + + header = start_header ("././@LongLink", &foo); + header->header.typeflag = type; + finish_header (header); + + header = find_next_block (); + + bufsize = available_space_after (header); + + while (bufsize < size) + { + memcpy (header->buffer, p, bufsize); + p += bufsize; + size -= bufsize; + set_next_block_after (header + (bufsize - 1) / BLOCKSIZE); + header = find_next_block (); + bufsize = available_space_after (header); + } + memcpy (header->buffer, p, size); + memset (header->buffer + size, 0, bufsize - size); + set_next_block_after (header + (size - 1) / BLOCKSIZE); +} + +/* Header handling. */ -#ifdef S_ISSOCK - else if (S_ISSOCK(hstat.st_mode)) { - type = LF_FIFO; - } -#endif - else - goto unknown; +/* Make a header block for the file whose stat info is st, + and return its address. */ - if (!f_standard) goto unknown; +static union block * +start_header (const char *name, struct stat *st) +{ + union block *header; - hstat.st_size = 0; /* Force 0 size */ - header = start_header(p, &hstat); - if (header == NULL) - { - critical_error = 1; - goto badfile; /* eg name too long */ - } + if (!absolute_names_option) + { + size_t prefix_len = FILESYSTEM_PREFIX_LEN (name); - 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); + if (prefix_len) + { + static int warned_once; + if (!warned_once) + { + warned_once = 1; + WARN ((0, 0, _("Removing `%.*s' prefix from member names"), + (int) prefix_len, name)); + } + name += prefix_len; } -#endif - finish_header(header); - if (f_remove_files) + while (*name == '/') + { + static int warned_once; + if (!warned_once) + { + warned_once = 1; + WARN ((0, 0, _("Removing leading `/' from member names"))); + } + name++; + } + + { + static int warned_once; + if (! warned_once && contains_dot_dot (name)) { - if (unlink (p) == -1) - msg_perror ("cannot remove %s", p); + warned_once = 1; + WARN ((0, 0, _("Member names contain `..'"))); } - return; - - unknown: - msg("%s: Unknown file type; file ignored.", p); + } + } + + if (sizeof header->header.name <= strlen (name)) + write_long (name, GNUTYPE_LONGNAME); + header = find_next_block (); + memset (header->buffer, 0, sizeof (union block)); + + assign_string (¤t_file_name, name); + + strncpy (header->header.name, name, NAME_FIELD_SIZE); + header->header.name[NAME_FIELD_SIZE - 1] = '\0'; + + /* Override some stat fields, if requested to do so. */ + + if (owner_option != (uid_t) -1) + st->st_uid = owner_option; + if (group_option != (gid_t) -1) + st->st_gid = group_option; + if (mode_option) + st->st_mode = ((st->st_mode & ~MODE_ALL) + | mode_adjust (st->st_mode, mode_option)); + + /* Paul Eggert tried the trivial test ($WRITER cf a b; $READER tvf a) + for a few tars and came up with the following interoperability + matrix: + + WRITER + 1 2 3 4 5 6 7 8 9 READER + . . . . . . . . . 1 = SunOS 4.2 tar + # . . # # . . # # 2 = NEC SVR4.0.2 tar + . . . # # . . # . 3 = Solaris 2.1 tar + . . . . . . . . . 4 = GNU tar 1.11.1 + . . . . . . . . . 5 = HP-UX 8.07 tar + . . . . . . . . . 6 = Ultrix 4.1 + . . . . . . . . . 7 = AIX 3.2 + . . . . . . . . . 8 = Hitachi HI-UX 1.03 + . . . . . . . . . 9 = Omron UNIOS-B 4.3BSD 1.60Beta + + . = works + # = ``impossible file type'' + + The following mask for old archive removes the `#'s in column 4 + above, thus making GNU tar both a universal donor and a universal + acceptor for Paul's test. */ + + if (archive_format == V7_FORMAT) + MODE_TO_CHARS (st->st_mode & MODE_ALL, header->header.mode); + else + MODE_TO_CHARS (st->st_mode, header->header.mode); + + UID_TO_CHARS (st->st_uid, header->header.uid); + GID_TO_CHARS (st->st_gid, header->header.gid); + OFF_TO_CHARS (st->st_size, header->header.size); + TIME_TO_CHARS (st->st_mtime, header->header.mtime); + + if (incremental_option) + if (archive_format == OLDGNU_FORMAT) + { + TIME_TO_CHARS (st->st_atime, header->oldgnu_header.atime); + TIME_TO_CHARS (st->st_ctime, header->oldgnu_header.ctime); + } + + header->header.typeflag = archive_format == V7_FORMAT ? AREGTYPE : REGTYPE; + + switch (archive_format) + { + case V7_FORMAT: + break; + + case OLDGNU_FORMAT: + /* Overwrite header->header.magic and header.version in one blow. */ + strcpy (header->header.magic, OLDGNU_MAGIC); + break; + + case POSIX_FORMAT: + case GNU_FORMAT: + strncpy (header->header.magic, TMAGIC, TMAGLEN); + strncpy (header->header.version, TVERSION, TVERSLEN); + break; + + default: + abort (); + } + + if (archive_format == V7_FORMAT || numeric_owner_option) + { + /* header->header.[ug]name are left as the empty string. */ + } + else + { + uid_to_uname (st->st_uid, header->header.uname); + gid_to_gname (st->st_gid, header->header.gname); + } + + return header; } -int -finish_sparse_file(fd, sizeleft, fullsize, name) - int fd; - long *sizeleft, - fullsize; - char *name; +/*-------------------------------------------------------------------------. +| 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 (union block *header) { - 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); - } + size_t i; + int sum; + char *p; + memcpy (header->header.chksum, CHKBLANKS, sizeof header->header.chksum); - 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); + sum = 0; + p = header->buffer; + for (i = sizeof *header; i-- != 0; ) + /* We can't use unsigned char here because of old compilers, e.g. V7. */ + sum += 0xFF & *p++; - } - free(sparsearray); -/* printf ("Amount actually written is (I hope) %d.\n", nwritten); */ -/* userec(start+(count-1)/RECORDSIZE);*/ - return 0; + /* 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, then a null. We use to_chars. + The final space is already there, from + checksumming, and to_chars doesn't modify it. + + This is a fast way to do: + + sprintf(header->header.chksum, "%6o", sum); */ + uintmax_to_chars ((uintmax_t) sum, header->header.chksum, 7); + + if (verbose_option + && header->header.typeflag != GNUTYPE_LONGLINK + && header->header.typeflag != GNUTYPE_LONGNAME) + { + /* These globals are parameters to print_header, sigh. */ + + current_header = header; + /* current_stat is already set up. */ + current_format = archive_format; + print_header (); + } + + set_next_block_after (header); } + +/* Sparse file processing. */ -void -init_sparsearray() +/*-------------------------------------------------------------------------. +| Takes a blockful 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 nonzero, i.e., useful data. | +`-------------------------------------------------------------------------*/ + +static int +zero_block_p (char *buffer) { - 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; - } -} + int counter; + for (counter = 0; counter < BLOCKSIZE; counter++) + if (buffer[counter] != '\0') + return 0; + return 1; +} +/*---. +| ? | +`---*/ -/* - * 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; +static void +init_sparsearray (void) { - 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 *) - 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; - close(fd); + int counter; + + sp_array_size = 10; - return sparse_ind - 1; + /* Make room for our scratch space -- initially is 10 elts long. */ + + sparsearray = xmalloc (sp_array_size * sizeof (struct sp_array)); + for (counter = 0; counter < sp_array_size; counter++) + { + sparsearray[counter].offset = 0; + sparsearray[counter].numbytes = 0; + } } -/* - * 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'; +static off_t +find_new_file_size (int sparses) +{ + int i; + off_t s = 0; + for (i = 0; i < sparses; i++) + s += sparsearray[i].numbytes; + return s; } -#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; +/*-----------------------------------------------------------------------. +| Make one pass over the file NAME, studying where any non-zero data is, | +| that is, how far into the file each instance of data is, and how many | +| bytes are there. Save this information in the sparsearray, which will | +| later be translated into header information. | +`-----------------------------------------------------------------------*/ + +/* There is little point in trimming small amounts of null data at the head + and tail of blocks, only avoid dumping full null blocks. */ + +/* FIXME: this routine might accept bits of algorithmic cleanup, it is + too kludgey for my taste... */ + +static int +deal_with_sparse (char *name, union block *header) { - 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++; - } + size_t numbytes = 0; + off_t offset = 0; + int file; + int sparses = 0; + ssize_t count; + char buffer[BLOCKSIZE]; + + if (archive_format == OLDGNU_FORMAT) + header->oldgnu_header.isextended = 0; + + if (file = open (name, O_RDONLY), file < 0) + /* This problem will be caught later on, so just return. */ + return 0; + + init_sparsearray (); + clear_buffer (buffer); + + while (0 < (count = safe_read (file, buffer, sizeof buffer))) + { + /* Realloc the scratch area as necessary. FIXME: should reallocate + only at beginning of a new instance of non-zero data. */ + + if (sp_array_size <= sparses) + { + sparsearray = + xrealloc (sparsearray, + 2 * sp_array_size * sizeof (struct sp_array)); + sp_array_size *= 2; } - if (i == RECORDSIZE) - *to = i; + + /* Process one block. */ + + if (count == sizeof buffer) + + if (zero_block_p (buffer)) + { + if (numbytes) + { + sparsearray[sparses++].numbytes = numbytes; + numbytes = 0; + } + } + else + { + if (!numbytes) + sparsearray[sparses].offset = offset; + numbytes += count; + } + + else + + /* Since count < sizeof buffer, we have the last bit of the file. */ + + if (!zero_block_p (buffer)) + { + if (!numbytes) + sparsearray[sparses].offset = offset; + numbytes += count; + } else - *to = save_to; - + /* The next two lines are suggested by Andreas Degert, who says + they are required for trailing full blocks to be written to the + archive, when all zeroed. Yet, it seems to me that the case + does not apply. Further, at restore time, the file is not as + sparse as it should. So, some serious cleanup is *also* needed + in this area. Just one more... :-(. FIXME. */ + if (numbytes) + numbytes += count; + + /* Prepare for next block. */ + + offset += count; + /* FIXME: do not clear unless necessary. */ + clear_buffer (buffer); + } + + if (numbytes) + sparsearray[sparses++].numbytes = numbytes; + else + { + sparsearray[sparses].offset = offset - 1; + sparsearray[sparses++].numbytes = 1; + } + + close (file); + return count < 0 ? 0 : sparses; } -#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; +/*---. +| ? | +`---*/ + +static int +finish_sparse_file (int file, off_t *sizeleft, off_t fullsize, char *name) { - char *fp, *tp; - - for (fp = buffer; ! *fp; fp++) - ; - for (tp = buffer + RECORDSIZE - 1; ! *tp; tp--) - ; - *from = fp - buffer; - *to = tp - buffer + 1; -} -#endif + union block *start; + size_t bufsize; + int sparses = 0; + ssize_t count; + + while (*sizeleft > 0) + { + start = find_next_block (); + memset (start->buffer, 0, BLOCKSIZE); + bufsize = sparsearray[sparses].numbytes; + if (! bufsize) + abort (); + + if (lseek (file, sparsearray[sparses++].offset, SEEK_SET) < 0) + { + (ignore_failed_read_option ? seek_warn_details : seek_error_details) + (name, sparsearray[sparses - 1].offset); + break; + } + /* If the number of bytes to be written here exceeds the size of + the temporary buffer, do it in steps. */ + while (bufsize > BLOCKSIZE) + { + count = safe_read (file, start->buffer, BLOCKSIZE); + if (count < 0) + { + (ignore_failed_read_option + ? read_warn_details + : read_error_details) + (name, fullsize - *sizeleft, bufsize); + return 1; + } + bufsize -= count; + *sizeleft -= count; + set_next_block_after (start); + start = find_next_block (); + memset (start->buffer, 0, BLOCKSIZE); + } -/* - * 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; + { + char buffer[BLOCKSIZE]; + + clear_buffer (buffer); + count = safe_read (file, buffer, bufsize); + memcpy (start->buffer, buffer, BLOCKSIZE); + } - for (i = 0; i < RECORDSIZE; i++) - if (buffer[i] != '\000') - return 0; - return 1; + if (count < 0) + { + (ignore_failed_read_option + ? read_warn_details + : read_error_details) + (name, fullsize - *sizeleft, bufsize); + return 1; + } + + *sizeleft -= count; + set_next_block_after (start); + } + free (sparsearray); +#if 0 + set_next_block_after (start + (count - 1) / BLOCKSIZE); +#endif + return 0; } + +/* Main functions of this module. */ + +/*---. +| ? | +`---*/ void -find_new_file_size(filesize, highest_index) - int *filesize; - int highest_index; +create_archive (void) { - register int i; + char *p; + + open_archive (ACCESS_WRITE); + + if (incremental_option) + { + char *buffer = xmalloc (PATH_MAX); + const char *q; + char *bufp; + + collect_and_sort_names (); + + while (p = name_from_list (), p) + if (!excluded_name (p)) + dump_file (p, -1, (dev_t) 0); - *filesize = 0; - for (i = 0; sparsearray[i].numbytes && i <= highest_index; i++) - *filesize += sparsearray[i].numbytes; + blank_name_list (); + while (p = name_from_list (), p) + if (!excluded_name (p)) + { + strcpy (buffer, p); + if (p[strlen (p) - 1] != '/') + strcat (buffer, "/"); + bufp = buffer + strlen (buffer); + q = gnu_list_name->dir_contents; + if (q) + for (; *q; q += strlen (q) + 1) + if (*q == 'Y') + { + strcpy (bufp, q + 1); + dump_file (buffer, -1, (dev_t) 0); + } + } + free (buffer); + } + else + { + while (p = name_next (1), p) + if (!excluded_name (p)) + dump_file (p, 1, (dev_t) 0); + } + + write_eot (); + close_archive (); + + if (listed_incremental_option) + write_directory_file (); } - -/* - * 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; + +/* Dump a single file, recursing on directories. P is the file name + to dump. TOP_LEVEL tells whether this is a top-level call; zero + means no, positive means yes, and negative means an incremental + dump. PARENT_DEVICE is the device of P's + parent directory; it is examined only if TOP_LEVEL is zero. + + Set global CURRENT_STAT to stat output for this file. */ + +/* FIXME: One should make sure that for *every* path leading to setting + exit_status to failure, a clear diagnostic has been issued. */ + +void +dump_file (char *p, int top_level, dev_t parent_device) { - 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"); - } + union block *header; + char type; + union block *exhdr; + char save_typeflag; + time_t original_ctime; + struct utimbuf restore_times; + + /* FIXME: `header' and `sparses' might be used uninitialized in this + function. Reported by Bruno Haible. */ + + if (interactive_option && !confirm ("add", p)) + return; + + if (deref_stat (dereference_option, p, ¤t_stat) != 0) + { + if (ignore_failed_read_option) + stat_warn (p); + else + stat_error (p); + return; + } + + original_ctime = current_stat.st_ctime; + restore_times.actime = current_stat.st_atime; + restore_times.modtime = current_stat.st_mtime; + +#ifdef S_ISHIDDEN + if (S_ISHIDDEN (current_stat.st_mode)) + { + char *new = (char *) alloca (strlen (p) + 2); + if (new) + { + strcpy (new, p); + strcat (new, "@"); + p = new; + } + } +#endif + + /* See if we want only new files, and check if this one is too old to + put in the archive. */ + + if ((0 < top_level || !incremental_option) + && !S_ISDIR (current_stat.st_mode) + && current_stat.st_mtime < newer_mtime_option + && (!after_date_option || current_stat.st_ctime < newer_ctime_option)) + { + if (0 < top_level) + WARN ((0, 0, _("%s: file is unchanged; not dumped"), + quotearg_colon (p))); + /* FIXME: recheck this return. */ + return; + } + +#if !MSDOS + /* See if we are trying to dump the archive. */ + + if (ar_dev && current_stat.st_dev == ar_dev && current_stat.st_ino == ar_ino) + { + WARN ((0, 0, _("%s: file is the archive; not dumped"), + quotearg_colon (p))); + return; + } #endif - while ('/' == *name) { - name++; /* Force relative path */ - if (!warned_once++) - msg("Removing leading / from absolute path names in the archive."); + + if (S_ISDIR (current_stat.st_mode)) + { + DIR *directory; + struct dirent *entry; + char *namebuf; + size_t buflen; + size_t len; + dev_t our_device = current_stat.st_dev; + + errno = 0; + + directory = opendir (p); + if (! directory) + { + if (ignore_failed_read_option) + opendir_warn (p); + else + opendir_error (p); + return; + } + + /* Build new prototype name. Ensure exactly one trailing slash. */ + + len = strlen (p); + buflen = len + NAME_FIELD_SIZE; + namebuf = xmalloc (buflen + 1); + strncpy (namebuf, p, buflen); + while (len >= 1 && namebuf[len - 1] == '/') + len--; + namebuf[len++] = '/'; + namebuf[len] = '\0'; + + if (! is_avoided_name (namebuf)) + { + /* The condition above used to be "archive_format != V7_FORMAT". + GNU tar was not writing directory blocks at all. Daniel Trinkle + writes: ``All old versions of tar I have ever seen have + correctly archived an empty directory. The really old ones I + checked included HP-UX 7 and Mt. Xinu More/BSD. There may be + some subtle reason for the exclusion that I don't know, but the + current behavior is broken.'' I do not know those subtle + reasons either, so until these are reported (anew?), just allow + directory blocks to be written even with old archives. */ + + current_stat.st_size = 0; /* force 0 size on dir */ + + /* FIXME: If people could really read standard archives, this + should be: + + header + = start_header (standard_option ? p : namebuf, ¤t_stat); + + but since they'd interpret DIRTYPE blocks as regular + files, we'd better put the / on the name. */ + + header = start_header (namebuf, ¤t_stat); + + if (incremental_option) + header->header.typeflag = GNUTYPE_DUMPDIR; + else /* if (standard_option) */ + header->header.typeflag = DIRTYPE; + + /* If we're gnudumping, we aren't done yet so don't close it. */ + + if (!incremental_option) + finish_header (header); /* done with directory header */ + } + + if (incremental_option && gnu_list_name->dir_contents) + { + off_t sizeleft; + off_t totsize; + size_t bufsize; + union block *start; + ssize_t count; + const char *buffer, *p_buffer; + + buffer = gnu_list_name->dir_contents; /* FOO */ + totsize = 0; + for (p_buffer = buffer; p_buffer && *p_buffer;) + { + size_t tmp; + + tmp = strlen (p_buffer) + 1; + totsize += tmp; + p_buffer += tmp; + } + totsize++; + OFF_TO_CHARS (totsize, header->header.size); + finish_header (header); + p_buffer = buffer; + sizeleft = totsize; + while (sizeleft > 0) + { + if (multi_volume_option) + { + assign_string (&save_name, p); + save_sizeleft = sizeleft; + save_totsize = totsize; + } + start = find_next_block (); + bufsize = available_space_after (start); + if (sizeleft < bufsize) + { + bufsize = sizeleft; + count = bufsize % BLOCKSIZE; + if (count) + memset (start->buffer + sizeleft, 0, BLOCKSIZE - count); } + memcpy (start->buffer, p_buffer, bufsize); + sizeleft -= bufsize; + p_buffer += bufsize; + set_next_block_after (start + (bufsize - 1) / BLOCKSIZE); + } + if (multi_volume_option) + assign_string (&save_name, 0); + goto finish_dir; } - strncpy(header->header.name, name, NAMSIZ); - if (header->header.name[NAMSIZ-1]) { -/* char *mangled;*/ - /* next_mangle(header->header.name); */ - add_mangle(name,header->header.name); - msg("%s: is too long: mangling to %s", name, header->header.name); + /* See if we are about to recurse into a directory, and avoid doing + so if the user wants that we do not descend into directories. */ + + if (no_recurse_option) + goto finish_dir; + + /* 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 (one_file_system_option && !top_level + && parent_device != current_stat.st_dev) + { + if (verbose_option) + WARN ((0, 0, + _("%s: file is on a different filesystem; not dumped"), + quotearg_colon (p))); + goto finish_dir; } - to_oct((long) (st->st_mode & 07777), - 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); + /* Now output all the files in the directory. */ + + /* FIXME: Should speed this up by cd-ing into the dir. */ + + while (errno = 0, (entry = readdir (directory))) + { + /* Skip `.', `..', and excluded file names. */ + + if (is_dot_or_dotdot (entry->d_name)) + continue; + + if ((int) NAMLEN (entry) + len >= buflen) + { + buflen = len + NAMLEN (entry); + namebuf = xrealloc (namebuf, buflen + 1); + } + strcpy (namebuf + len, entry->d_name); + if (!excluded_name (namebuf)) + dump_file (namebuf, 0, our_device); } -#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); + if (errno) + { + if (ignore_failed_read_option) + readdir_warn (p); + else + readdir_error (p); } -#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++; + finish_dir: + if (closedir (directory) != 0) + { + if (ignore_failed_read_option) + closedir_warn (p); + else + closedir_error (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(); + free (namebuf); + if (atime_preserve_option) + utime (p, &restore_times); + return; + } + else if (is_avoided_name (p)) + return; + else + { + /* 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 (1 < current_stat.st_nlink) + { + struct link *lp; + + /* FIXME: First quick and dirty. Hashing, etc later. */ + + for (lp = linklist; lp; lp = lp->next) + if (lp->ino == current_stat.st_ino + && lp->dev == current_stat.st_dev) + { + char *link_name = lp->name; + + /* We found a link. */ + + while (!absolute_names_option && *link_name == '/') + { + static int warned_once; + if (!warned_once) + { + warned_once = 1; + WARN ((0, 0, + _("Removing leading `/' from link names"))); + } + link_name++; + } + if (strlen (link_name) >= NAME_FIELD_SIZE) + write_long (link_name, GNUTYPE_LONGLINK); + assign_string (¤t_link_name, link_name); + + current_stat.st_size = 0; + header = start_header (p, ¤t_stat); + strncpy (header->header.linkname, + link_name, NAME_FIELD_SIZE); + + /* Force null truncated. */ + + header->header.linkname[NAME_FIELD_SIZE - 1] = 0; + + header->header.typeflag = LNKTYPE; + finish_header (header); + + /* FIXME: Maybe remove from list after all links found? */ + + if (remove_files_option) + if (unlink (p) == -1) + unlink_error (p); + + /* We dumped it. */ + return; + } + + /* Not found. Add it to the list of possible links. */ + + lp = xmalloc (sizeof (struct link) + strlen (p)); + lp->ino = current_stat.st_ino; + lp->dev = current_stat.st_dev; + strcpy (lp->name, p); + lp->next = linklist; + linklist = lp; } - return; -} + /* This is not a link to a previously dumped file, so dump it. */ + if (S_ISREG (current_stat.st_mode) + || S_ISCTG (current_stat.st_mode)) + { + int f; /* file descriptor */ + size_t bufsize; + ssize_t count; + off_t sizeleft; + union block *start; + int header_moved; + char isextended = 0; + int sparses; + + header_moved = 0; + + if (sparse_option) + { + /* Check the size of the file against the number of blocks + allocated for it, counting both data and indirect blocks. + If there is a smaller number of blocks that would be + necessary to accommodate a file of this size, this is safe + to say that we have a sparse file: at least one of those + blocks in the file is just a useless hole. For sparse + files not having more hole blocks than indirect blocks, the + sparseness will go undetected. */ + + /* Bruno Haible sent me these statistics for Linux. It seems + that some filesystems count indirect blocks in st_blocks, + while others do not seem to: + + minix-fs tar: size=7205, st_blocks=18 and ST_NBLOCKS=18 + extfs tar: size=7205, st_blocks=18 and ST_NBLOCKS=18 + ext2fs tar: size=7205, st_blocks=16 and ST_NBLOCKS=16 + msdos-fs tar: size=7205, st_blocks=16 and ST_NBLOCKS=16 + + Dick Streefland reports the previous numbers as misleading, + because ext2fs use 12 direct blocks, while minix-fs uses only + 6 direct blocks. Dick gets: + + ext2 size=20480 ls listed blocks=21 + minix size=20480 ls listed blocks=21 + msdos size=20480 ls listed blocks=20 + + It seems that indirect blocks *are* included in st_blocks. + The minix filesystem does not account for phantom blocks in + st_blocks, so `du' and `ls -s' give wrong results. So, the + --sparse option would not work on a minix filesystem. */ + + if (ST_NBLOCKS (current_stat) + < (current_stat.st_size / ST_NBLOCKSIZE + + (current_stat.st_size % ST_NBLOCKSIZE != 0))) + { + int counter; + + header = start_header (p, ¤t_stat); + header->header.typeflag = GNUTYPE_SPARSE; + header_moved = 1; + + /* Call the routine that figures out the layout of the + sparse file in question. SPARSES is the index of the + first unused element of the "sparsearray," i.e., + the number of elements it needed to describe the file. */ + + sparses = deal_with_sparse (p, header); + + /* See if we'll need an extended header later. */ + + if (SPARSES_IN_OLDGNU_HEADER < sparses) + header->oldgnu_header.isextended = 1; + + /* 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. */ + + OFF_TO_CHARS (current_stat.st_size, + header->oldgnu_header.realsize); + + /* This will be the new "size" of the file, i.e., the size + of the file minus the blocks of holes that we're + skipping over. */ + + current_stat.st_size = find_new_file_size (sparses); + OFF_TO_CHARS (current_stat.st_size, header->header.size); + + for (counter = 0; + counter < sparses && counter < SPARSES_IN_OLDGNU_HEADER; + counter++) + { + OFF_TO_CHARS (sparsearray[counter].offset, + header->oldgnu_header.sp[counter].offset); + SIZE_TO_CHARS (sparsearray[counter].numbytes, + header->oldgnu_header.sp[counter].numbytes); + } + } + } + else + sparses = SPARSES_IN_OLDGNU_HEADER; + + sizeleft = current_stat.st_size; + + /* Don't bother opening empty, world readable files. Also do not open + files when archive is meant for /dev/null. */ + + if (dev_null_output + || (sizeleft == 0 + && MODE_R == (MODE_R & current_stat.st_mode))) + f = -1; + else + { + f = open (p, O_RDONLY | O_BINARY); + if (f < 0) + { + if (! top_level && errno == ENOENT) + WARN ((0, 0, _("%s: File removed before we read it"), + quotearg_colon (p))); + else + (ignore_failed_read_option ? open_warn : open_error) (p); + return; + } + } + + /* If the file is sparse, we've already taken care of this. */ + + if (!header_moved) + header = start_header (p, ¤t_stat); + + /* Mark contiguous files, if we support them. */ + + if (archive_format != V7_FORMAT && S_ISCTG (current_stat.st_mode)) + header->header.typeflag = CONTTYPE; + + isextended = header->oldgnu_header.isextended; + save_typeflag = header->header.typeflag; + finish_header (header); + if (isextended) + { + int counter; + /* static */ int index_offset = SPARSES_IN_OLDGNU_HEADER; + + extend: + exhdr = find_next_block (); + memset (exhdr->buffer, 0, BLOCKSIZE); + for (counter = 0; counter < SPARSES_IN_SPARSE_HEADER; counter++) + { + if (sparses <= counter + index_offset) + break; + + SIZE_TO_CHARS (sparsearray[counter + index_offset].numbytes, + exhdr->sparse_header.sp[counter].numbytes); + OFF_TO_CHARS (sparsearray[counter + index_offset].offset, + exhdr->sparse_header.sp[counter].offset); + } + set_next_block_after (exhdr); + if (counter + index_offset < sparses) + { + index_offset += counter; + exhdr->sparse_header.isextended = 1; + goto extend; + } -/* - * 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 */ + } + if (save_typeflag == GNUTYPE_SPARSE) + { + if (f < 0 + || finish_sparse_file (f, &sizeleft, + current_stat.st_size, p)) + goto padit; + } + else + while (sizeleft > 0) + { + if (multi_volume_option) + { + assign_string (&save_name, p); + save_sizeleft = sizeleft; + save_totsize = current_stat.st_size; + } + start = find_next_block (); - /* Produce the digits -- at least one */ - do { - where[--digs] = '0' + (char)(value & 7); /* one octal digit */ - value >>= 3; - } while (digs > 0 && value != 0); + bufsize = available_space_after (start); - /* Leading spaces, if necessary */ - while (digs > 0) - where[--digs] = ' '; + if (sizeleft < bufsize) + { + /* Last read -- zero out area beyond. */ -} + bufsize = sizeleft; + count = bufsize % BLOCKSIZE; + if (count) + memset (start->buffer + sizeleft, 0, BLOCKSIZE - count); + } + if (f < 0) + count = bufsize; + else + count = safe_read (f, start->buffer, bufsize); + if (count < 0) + { + (ignore_failed_read_option + ? read_warn_details + : read_error_details) + (p, current_stat.st_size - sizeleft, bufsize); + goto padit; + } + sizeleft -= count; + /* This is nonportable (the type of set_next_block_after's arg). */ -/* - * 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; + set_next_block_after (start + (count - 1) / BLOCKSIZE); - p = findrec(); - if (p) - { - bufsize = endofrecs()->charptr - p->charptr; - bzero(p->charptr, bufsize); - userec(p); - } + if (count == bufsize) + continue; + else + { + char buf[UINTMAX_STRSIZE_BOUND]; + WARN ((0, 0, + _("%s: File shrank by %s bytes; padding with zeros"), + quotearg_colon (p), + STRINGIFY_BIGINT (sizeleft, buf))); + if (! ignore_failed_read_option) + exit_status = TAREXIT_FAILURE; + goto padit; /* short read */ + } + } + + if (multi_volume_option) + assign_string (&save_name, 0); + + if (f >= 0) + { + struct stat final_stat; + if (fstat (f, &final_stat) != 0) + { + if (ignore_failed_read_option) + stat_warn (p); + else + stat_error (p); + } + else if (final_stat.st_ctime != original_ctime) + { + char const *qp = quotearg_colon (p); + WARN ((0, 0, _("%s: file changed as we read it"), qp)); + if (! ignore_failed_read_option) + exit_status = TAREXIT_FAILURE; + } + if (close (f) != 0) + { + if (ignore_failed_read_option) + close_warn (p); + else + close_error (p); + } + if (atime_preserve_option) + utime (p, &restore_times); + } + if (remove_files_option) + { + if (unlink (p) == -1) + unlink_error (p); + } + 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 = find_next_block (); + memset (start->buffer, 0, BLOCKSIZE); + set_next_block_after (start); + sizeleft -= BLOCKSIZE; + } + if (multi_volume_option) + assign_string (&save_name, 0); + if (f >= 0) + { + close (f); + if (atime_preserve_option) + utime (p, &restore_times); + } + return; + } +#ifdef HAVE_READLINK + else if (S_ISLNK (current_stat.st_mode)) + { + int size; + char *buffer = (char *) alloca (PATH_MAX + 1); + + size = readlink (p, buffer, PATH_MAX + 1); + if (size < 0) + { + if (ignore_failed_read_option) + readlink_warn (p); + else + readlink_error (p); + return; + } + buffer[size] = '\0'; + if (size >= NAME_FIELD_SIZE) + write_long (buffer, GNUTYPE_LONGLINK); + assign_string (¤t_link_name, buffer); + + current_stat.st_size = 0; /* force 0 size on symlink */ + header = start_header (p, ¤t_stat); + strncpy (header->header.linkname, buffer, NAME_FIELD_SIZE); + header->header.linkname[NAME_FIELD_SIZE - 1] = '\0'; + header->header.typeflag = SYMTYPE; + finish_header (header); /* nothing more to do to it */ + if (remove_files_option) + { + if (unlink (p) == -1) + unlink_error (p); + } + return; + } +#endif + else if (S_ISCHR (current_stat.st_mode)) + type = CHRTYPE; + else if (S_ISBLK (current_stat.st_mode)) + type = BLKTYPE; + else if (S_ISFIFO (current_stat.st_mode)) + type = FIFOTYPE; + else if (S_ISSOCK (current_stat.st_mode)) + { + WARN ((0, 0, _("%s: socket ignored"), quotearg_colon (p))); + return; + } + else if (S_ISDOOR (current_stat.st_mode)) + { + WARN ((0, 0, _("%s: door ignored"), quotearg_colon (p))); + return; + } + else + goto unknown; + } + + if (archive_format == V7_FORMAT) + goto unknown; + + current_stat.st_size = 0; /* force 0 size */ + header = start_header (p, ¤t_stat); + header->header.typeflag = type; + + if (type != FIFOTYPE) + { + MAJOR_TO_CHARS (major (current_stat.st_rdev), header->header.devmajor); + MINOR_TO_CHARS (minor (current_stat.st_rdev), header->header.devminor); + } + + finish_header (header); + if (remove_files_option) + { + if (unlink (p) == -1) + unlink_error (p); + } + return; + +unknown: + WARN ((0, 0, _("%s: Unknown file type; file ignored"), + quotearg_colon (p))); + if (! ignore_failed_read_option) + exit_status = TAREXIT_FAILURE; }