ar_subs.c revision 76351
11541Srgrimes/*- 21541Srgrimes * Copyright (c) 1992 Keith Muller. 31541Srgrimes * Copyright (c) 1992, 1993 41541Srgrimes * The Regents of the University of California. All rights reserved. 51541Srgrimes * 61541Srgrimes * This code is derived from software contributed to Berkeley by 71541Srgrimes * Keith Muller of the University of California, San Diego. 81541Srgrimes * 91541Srgrimes * Redistribution and use in source and binary forms, with or without 101541Srgrimes * modification, are permitted provided that the following conditions 111541Srgrimes * are met: 121541Srgrimes * 1. Redistributions of source code must retain the above copyright 131541Srgrimes * notice, this list of conditions and the following disclaimer. 141541Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 151541Srgrimes * notice, this list of conditions and the following disclaimer in the 161541Srgrimes * documentation and/or other materials provided with the distribution. 171541Srgrimes * 3. All advertising materials mentioning features or use of this software 181541Srgrimes * must display the following acknowledgement: 191541Srgrimes * This product includes software developed by the University of 201541Srgrimes * California, Berkeley and its contributors. 211541Srgrimes * 4. Neither the name of the University nor the names of its contributors 221541Srgrimes * may be used to endorse or promote products derived from this software 231541Srgrimes * without specific prior written permission. 241541Srgrimes * 251541Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 261541Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 271541Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 281541Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 291541Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 301541Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 311541Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 321541Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 331541Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 341541Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 351541Srgrimes * SUCH DAMAGE. 361541Srgrimes */ 371541Srgrimes 381541Srgrimes#ifndef lint 398876Srgrimes#if 0 401541Srgrimesstatic char sccsid[] = "@(#)ar_subs.c 8.2 (Berkeley) 4/18/94"; 411541Srgrimes#endif 421541Srgrimesstatic const char rcsid[] = 432806Sbde "$FreeBSD: head/bin/pax/ar_subs.c 76351 2001-05-08 06:19:06Z kris $"; 441541Srgrimes#endif /* not lint */ 451541Srgrimes 461541Srgrimes#include <sys/types.h> 471541Srgrimes#include <sys/time.h> 481541Srgrimes#include <sys/stat.h> 491541Srgrimes#include <signal.h> 501541Srgrimes#include <string.h> 511541Srgrimes#include <stdio.h> 521541Srgrimes#include <fcntl.h> 531541Srgrimes#include <errno.h> 541541Srgrimes#include <unistd.h> 551541Srgrimes#include <stdlib.h> 561541Srgrimes#include "pax.h" 571541Srgrimes#include "extern.h" 581541Srgrimes 591541Srgrimesstatic void wr_archive __P((register ARCHD *, int is_app)); 601541Srgrimesstatic int get_arc __P((void)); 611541Srgrimesstatic int next_head __P((register ARCHD *)); 621541Srgrimesextern sigset_t s_mask; 631541Srgrimes 641541Srgrimes/* 651541Srgrimes * Routines which control the overall operation modes of pax as specified by 661541Srgrimes * the user: list, append, read ... 671541Srgrimes */ 681541Srgrimes 691541Srgrimesstatic char hdbuf[BLKMULT]; /* space for archive header on read */ 701541Srgrimesu_long flcnt; /* number of files processed */ 711541Srgrimes 721541Srgrimes/* 731541Srgrimes * list() 741541Srgrimes * list the contents of an archive which match user supplied pattern(s) 751541Srgrimes * (no pattern matches all). 761541Srgrimes */ 771541Srgrimes 781541Srgrimes#ifdef __STDC__ 791541Srgrimesvoid 801541Srgrimeslist(void) 811541Srgrimes#else 821541Srgrimesvoid 835651Sjoerglist() 841541Srgrimes#endif 851541Srgrimes{ 861541Srgrimes register ARCHD *arcn; 871541Srgrimes register int res; 881541Srgrimes ARCHD archd; 891541Srgrimes time_t now; 901541Srgrimes 915651Sjoerg arcn = &archd; 921541Srgrimes /* 931541Srgrimes * figure out archive type; pass any format specific options to the 941541Srgrimes * archive option processing routine; call the format init routine. We 951541Srgrimes * also save current time for ls_list() so we do not make a system 961541Srgrimes * call for each file we need to print. If verbose (vflag) start up 971541Srgrimes * the name and group caches. 988876Srgrimes */ 991541Srgrimes if ((get_arc() < 0) || ((*frmt->options)() < 0) || 1001541Srgrimes ((*frmt->st_rd)() < 0)) 1011541Srgrimes return; 1021541Srgrimes 1031541Srgrimes if (vflag && ((uidtb_start() < 0) || (gidtb_start() < 0))) 1048876Srgrimes return; 1051541Srgrimes 1061541Srgrimes now = time(NULL); 1071541Srgrimes 1081541Srgrimes /* 1091541Srgrimes * step through the archive until the format says it is done 1101541Srgrimes */ 1111541Srgrimes while (next_head(arcn) == 0) { 1128876Srgrimes /* 1131541Srgrimes * check for pattern, and user specified options match. 1141541Srgrimes * When all patterns are matched we are done. 1151541Srgrimes */ 1161541Srgrimes if ((res = pat_match(arcn)) < 0) 1171541Srgrimes break; 1181541Srgrimes 1191541Srgrimes if ((res == 0) && (sel_chk(arcn) == 0)) { 1208876Srgrimes /* 1211541Srgrimes * pattern resulted in a selected file 1221541Srgrimes */ 1238876Srgrimes if (pat_sel(arcn) < 0) 1241541Srgrimes break; 1258876Srgrimes 1261541Srgrimes /* 1271541Srgrimes * modify the name as requested by the user if name 1281541Srgrimes * survives modification, do a listing of the file 1291541Srgrimes */ 1308876Srgrimes if ((res = mod_name(arcn)) < 0) 1311541Srgrimes break; 1321541Srgrimes if (res == 0) 1331541Srgrimes ls_list(arcn, now, stdout); 1341541Srgrimes } 1358876Srgrimes 1361541Srgrimes /* 1371541Srgrimes * skip to next archive format header using values calculated 1381541Srgrimes * by the format header read routine 1391541Srgrimes */ 1401541Srgrimes if (rd_skip(arcn->skip + arcn->pad) == 1) 1411541Srgrimes break; 1428876Srgrimes } 1431541Srgrimes 1441541Srgrimes /* 1451541Srgrimes * all done, let format have a chance to cleanup, and make sure that 1461541Srgrimes * the patterns supplied by the user were all matched 1471541Srgrimes */ 1481541Srgrimes (void)(*frmt->end_rd)(); 1491541Srgrimes (void)sigprocmask(SIG_BLOCK, &s_mask, NULL); 1501541Srgrimes ar_close(); 1518876Srgrimes pat_chk(); 1521541Srgrimes} 1531541Srgrimes 1541541Srgrimes/* 1551541Srgrimes * extract() 1561541Srgrimes * extract the member(s) of an archive as specified by user supplied 1578876Srgrimes * pattern(s) (no patterns extracts all members) 1581541Srgrimes */ 1591541Srgrimes 1601541Srgrimes#ifdef __STDC__ 1611541Srgrimesvoid 1621541Srgrimesextract(void) 1631541Srgrimes#else 1641541Srgrimesvoid 1651541Srgrimesextract() 1661541Srgrimes#endif 1671541Srgrimes{ 1681541Srgrimes register ARCHD *arcn; 1691541Srgrimes register int res; 1701541Srgrimes off_t cnt; 1718876Srgrimes ARCHD archd; 1721541Srgrimes struct stat sb; 1731541Srgrimes int fd; 1741541Srgrimes time_t now; 1751541Srgrimes 1761541Srgrimes arcn = &archd; 1771541Srgrimes /* 1781541Srgrimes * figure out archive type; pass any format specific options to the 1791541Srgrimes * archive option processing routine; call the format init routine; 1808876Srgrimes * start up the directory modification time and access mode database 1811541Srgrimes */ 1821541Srgrimes if ((get_arc() < 0) || ((*frmt->options)() < 0) || 1831541Srgrimes ((*frmt->st_rd)() < 0) || (dir_start() < 0)) 1848876Srgrimes return; 1851541Srgrimes 1861541Srgrimes /* 1871541Srgrimes * When we are doing interactive rename, we store the mapping of names 1881541Srgrimes * so we can fix up hard links files later in the archive. 1898876Srgrimes */ 1901541Srgrimes if (iflag && (name_start() < 0)) 1911541Srgrimes return; 1921541Srgrimes 1931541Srgrimes now = time(NULL); 1941541Srgrimes 1951541Srgrimes /* 1961541Srgrimes * step through each entry on the archive until the format read routine 1971541Srgrimes * says it is done 1981541Srgrimes */ 1991541Srgrimes while (next_head(arcn) == 0) { 2001541Srgrimes 2011541Srgrimes /* 2021541Srgrimes * check for pattern, and user specified options match. When 2031541Srgrimes * all the patterns are matched we are done 2041541Srgrimes */ 2051541Srgrimes if ((res = pat_match(arcn)) < 0) 2061541Srgrimes break; 2071541Srgrimes 2088876Srgrimes if ((res > 0) || (sel_chk(arcn) != 0)) { 2091541Srgrimes /* 2101541Srgrimes * file is not selected. skip past any file data and 2111541Srgrimes * padding and go back for the next archive member 2128876Srgrimes */ 2131541Srgrimes (void)rd_skip(arcn->skip + arcn->pad); 2141541Srgrimes continue; 2151541Srgrimes } 2161541Srgrimes 2171541Srgrimes /* 2188876Srgrimes * with -u or -D only extract when the archive member is newer 2191541Srgrimes * than the file with the same name in the file system (nos 2201541Srgrimes * test of being the same type is required). 2211541Srgrimes * NOTE: this test is done BEFORE name modifications as 2221541Srgrimes * specified by pax. this operation can be confusing to the 2238876Srgrimes * user who might expect the test to be done on an existing 2241541Srgrimes * file AFTER the name mod. In honesty the pax spec is probably 2251541Srgrimes * flawed in this respect. 2261541Srgrimes */ 2271541Srgrimes if ((uflag || Dflag) && ((lstat(arcn->name, &sb) == 0))) { 2281541Srgrimes if (uflag && Dflag) { 2298876Srgrimes if ((arcn->sb.st_mtime <= sb.st_mtime) && 2301541Srgrimes (arcn->sb.st_ctime <= sb.st_ctime)) { 2311541Srgrimes (void)rd_skip(arcn->skip + arcn->pad); 2321541Srgrimes continue; 2331541Srgrimes } 2341541Srgrimes } else if (Dflag) { 2351541Srgrimes if (arcn->sb.st_ctime <= sb.st_ctime) { 2361541Srgrimes (void)rd_skip(arcn->skip + arcn->pad); 2371541Srgrimes continue; 2388876Srgrimes } 2391541Srgrimes } else if (arcn->sb.st_mtime <= sb.st_mtime) { 2401541Srgrimes (void)rd_skip(arcn->skip + arcn->pad); 2411541Srgrimes continue; 2421541Srgrimes } 2431541Srgrimes } 2448876Srgrimes 2451541Srgrimes /* 2461541Srgrimes * this archive member is now been selected. modify the name. 2471541Srgrimes */ 2481541Srgrimes if ((pat_sel(arcn) < 0) || ((res = mod_name(arcn)) < 0)) 2491541Srgrimes break; 2501541Srgrimes if (res > 0) { 2511541Srgrimes /* 2528876Srgrimes * a bad name mod, skip and purge name from link table 2531541Srgrimes */ 2541541Srgrimes purg_lnk(arcn); 2558876Srgrimes (void)rd_skip(arcn->skip + arcn->pad); 2561541Srgrimes continue; 2571541Srgrimes } 2581541Srgrimes 2591541Srgrimes /* 2601541Srgrimes * Non standard -Y and -Z flag. When the existing file is 2611541Srgrimes * same age or newer skip 2621541Srgrimes */ 2631541Srgrimes if ((Yflag || Zflag) && ((lstat(arcn->name, &sb) == 0))) { 2641541Srgrimes if (Yflag && Zflag) { 2651541Srgrimes if ((arcn->sb.st_mtime <= sb.st_mtime) && 2661541Srgrimes (arcn->sb.st_ctime <= sb.st_ctime)) { 2671541Srgrimes (void)rd_skip(arcn->skip + arcn->pad); 2681541Srgrimes continue; 2691541Srgrimes } 2701541Srgrimes } else if (Yflag) { 2711541Srgrimes if (arcn->sb.st_ctime <= sb.st_ctime) { 2721541Srgrimes (void)rd_skip(arcn->skip + arcn->pad); 2731541Srgrimes continue; 2741541Srgrimes } 2751541Srgrimes } else if (arcn->sb.st_mtime <= sb.st_mtime) { 2761541Srgrimes (void)rd_skip(arcn->skip + arcn->pad); 2771541Srgrimes continue; 2781541Srgrimes } 2791541Srgrimes } 2801541Srgrimes 2811541Srgrimes if (vflag) { 2821541Srgrimes if (vflag > 1) 2831541Srgrimes ls_list(arcn, now, listf); 2841541Srgrimes else { 2851541Srgrimes (void)fputs(arcn->name, listf); 2861541Srgrimes vfpart = 1; 2871541Srgrimes } 2881541Srgrimes } 2895651Sjoerg 2901541Srgrimes /* 2911541Srgrimes * if required, chdir around. 2921541Srgrimes */ 2931541Srgrimes if ((arcn->pat != NULL) && (arcn->pat->chdname != NULL)) 2941541Srgrimes if (chdir(arcn->pat->chdname) != 0) 2951541Srgrimes syswarn(1, errno, "Cannot chdir to %s", 2961541Srgrimes arcn->pat->chdname); 2971541Srgrimes 2981541Srgrimes /* 2991541Srgrimes * all ok, extract this member based on type 3001541Srgrimes */ 3011541Srgrimes if ((arcn->type != PAX_REG) && (arcn->type != PAX_CTG)) { 3025651Sjoerg /* 3031541Srgrimes * process archive members that are not regular files. 3041541Srgrimes * throw out padding and any data that might follow the 3051541Srgrimes * header (as determined by the format). 3061541Srgrimes */ 3071541Srgrimes if ((arcn->type == PAX_HLK) || (arcn->type == PAX_HRG)) 3081541Srgrimes res = lnk_creat(arcn); 3091541Srgrimes else 3101541Srgrimes res = node_creat(arcn); 3111541Srgrimes 3121541Srgrimes (void)rd_skip(arcn->skip + arcn->pad); 3131541Srgrimes if (res < 0) 3141541Srgrimes purg_lnk(arcn); 3151541Srgrimes 3161541Srgrimes if (vflag && vfpart) { 3178876Srgrimes (void)putc('\n', listf); 3181541Srgrimes vfpart = 0; 3198876Srgrimes } 3201541Srgrimes continue; 3211541Srgrimes } 3221541Srgrimes /* 3231541Srgrimes * we have a file with data here. If we can not create it, skip 3248876Srgrimes * over the data and purge the name from hard link table 3251541Srgrimes */ 3265651Sjoerg if ((fd = file_creat(arcn)) < 0) { 3275651Sjoerg (void)rd_skip(arcn->skip + arcn->pad); 3281541Srgrimes purg_lnk(arcn); 3291541Srgrimes continue; 3302806Sbde } 3318876Srgrimes /* 3321541Srgrimes * extract the file from the archive and skip over padding and 3335651Sjoerg * any unprocessed data 3345651Sjoerg */ 3351541Srgrimes res = (*frmt->rd_data)(arcn, fd, &cnt); 3361541Srgrimes file_close(arcn, fd); 3371541Srgrimes if (vflag && vfpart) { 3388876Srgrimes (void)putc('\n', listf); 3391541Srgrimes vfpart = 0; 3405651Sjoerg } 3415651Sjoerg if (!res) 3421541Srgrimes (void)rd_skip(cnt + arcn->pad); 3431541Srgrimes 3448876Srgrimes /* 3451541Srgrimes * if required, chdir around. 3461541Srgrimes */ 3471541Srgrimes if ((arcn->pat != NULL) && (arcn->pat->chdname != NULL)) 3488876Srgrimes if (fchdir(cwdfd) != 0) 3491541Srgrimes syswarn(1, errno, 3501541Srgrimes "Can't fchdir to starting directory"); 3511541Srgrimes } 3521541Srgrimes 3532806Sbde /* 3548876Srgrimes * all done, restore directory modes and times as required; make sure 3551541Srgrimes * all patterns supplied by the user were matched; block off signals 3561541Srgrimes * to avoid chance for multiple entry into the cleanup code. 3571541Srgrimes */ 3581541Srgrimes (void)(*frmt->end_rd)(); 3591541Srgrimes (void)sigprocmask(SIG_BLOCK, &s_mask, NULL); 3608876Srgrimes ar_close(); 3611541Srgrimes proc_dir(); 3621541Srgrimes pat_chk(); 3631541Srgrimes} 3641541Srgrimes 3658876Srgrimes/* 3661541Srgrimes * wr_archive() 3671541Srgrimes * Write an archive. used in both creating a new archive and appends on 3681541Srgrimes * previously written archive. 3691541Srgrimes */ 3701541Srgrimes 3711541Srgrimes#ifdef __STDC__ 3721541Srgrimesstatic void 3731541Srgrimeswr_archive(register ARCHD *arcn, int is_app) 3741541Srgrimes#else 3751541Srgrimesstatic void 3765651Sjoergwr_archive(arcn, is_app) 3771541Srgrimes register ARCHD *arcn; 3781541Srgrimes int is_app; 3791541Srgrimes#endif 3801541Srgrimes{ 3811541Srgrimes register int res; 3821541Srgrimes register int hlk; 3831541Srgrimes register int wr_one; 3841541Srgrimes off_t cnt; 3851541Srgrimes int (*wrf)(); 3861541Srgrimes int fd = -1; 3871541Srgrimes time_t now; 3888876Srgrimes 3891541Srgrimes /* 3901541Srgrimes * if this format supports hard link storage, start up the database 3918876Srgrimes * that detects them. 3921541Srgrimes */ 3931541Srgrimes if (((hlk = frmt->hlk) == 1) && (lnk_start() < 0)) 3941541Srgrimes return; 3951541Srgrimes 3961541Srgrimes /* 3971541Srgrimes * start up the file traversal code and format specific write 3981541Srgrimes */ 3991541Srgrimes if ((ftree_start() < 0) || ((*frmt->st_wr)() < 0)) 4001541Srgrimes return; 4011541Srgrimes wrf = frmt->wr; 4021541Srgrimes 4031541Srgrimes /* 4041541Srgrimes * When we are doing interactive rename, we store the mapping of names 4051541Srgrimes * so we can fix up hard links files later in the archive. 4061541Srgrimes */ 4071541Srgrimes if (iflag && (name_start() < 0)) 4081541Srgrimes return; 4091541Srgrimes 4101541Srgrimes /* 4111541Srgrimes * if this not append, and there are no files, we do no write a trailer 4121541Srgrimes */ 4138876Srgrimes wr_one = is_app; 4141541Srgrimes 4151541Srgrimes now = time(NULL); 4161541Srgrimes 4171541Srgrimes /* 4181541Srgrimes * while there are files to archive, process them one at at time 4191541Srgrimes */ 4201541Srgrimes while (next_file(arcn) == 0) { 4211541Srgrimes /* 4221541Srgrimes * check if this file meets user specified options match. 4231541Srgrimes */ 4241541Srgrimes if (sel_chk(arcn) != 0) 4251541Srgrimes continue; 4261541Srgrimes fd = -1; 4271541Srgrimes if (uflag) { 4281541Srgrimes /* 4291541Srgrimes * only archive if this file is newer than a file with 4301541Srgrimes * the same name that is already stored on the archive 4311541Srgrimes */ 4321541Srgrimes if ((res = chk_ftime(arcn)) < 0) 4331541Srgrimes break; 4341541Srgrimes if (res > 0) 4351541Srgrimes continue; 4361541Srgrimes } 4371541Srgrimes 4381541Srgrimes /* 4391541Srgrimes * this file is considered selected now. see if this is a hard 4401541Srgrimes * link to a file already stored 4411541Srgrimes */ 4421541Srgrimes ftree_sel(arcn); 4431541Srgrimes if (hlk && (chk_lnk(arcn) < 0)) 4441541Srgrimes break; 4451541Srgrimes 4461541Srgrimes if ((arcn->type == PAX_REG) || (arcn->type == PAX_HRG) || 4471541Srgrimes (arcn->type == PAX_CTG)) { 4481541Srgrimes /* 4491541Srgrimes * we will have to read this file. by opening it now we 4501541Srgrimes * can avoid writing a header to the archive for a file 4511541Srgrimes * we were later unable to read (we also purge it from 4521541Srgrimes * the link table). 4531541Srgrimes */ 4541541Srgrimes if ((fd = open(arcn->org_name, O_RDONLY, 0)) < 0) { 4551541Srgrimes syswarn(1,errno, "Unable to open %s to read", 4561541Srgrimes arcn->org_name); 4571541Srgrimes purg_lnk(arcn); 4581541Srgrimes continue; 4591541Srgrimes } 4601541Srgrimes } 4611541Srgrimes 4621541Srgrimes /* 4631541Srgrimes * Now modify the name as requested by the user 4641541Srgrimes */ 4651541Srgrimes if ((res = mod_name(arcn)) < 0) { 4661541Srgrimes /* 4671541Srgrimes * name modification says to skip this file, close the 4681541Srgrimes * file and purge link table entry 4691541Srgrimes */ 4701541Srgrimes rdfile_close(arcn, &fd); 4711541Srgrimes purg_lnk(arcn); 4721541Srgrimes break; 4731541Srgrimes } 4741541Srgrimes 4751541Srgrimes if ((res > 0) || (docrc && (set_crc(arcn, fd) < 0))) { 4761541Srgrimes /* 4771541Srgrimes * unable to obtain the crc we need, close the file, 4781541Srgrimes * purge link table entry 4798876Srgrimes */ 4801541Srgrimes rdfile_close(arcn, &fd); 4811541Srgrimes purg_lnk(arcn); 4825651Sjoerg continue; 4831541Srgrimes } 4841541Srgrimes 4851541Srgrimes if (vflag) { 4861541Srgrimes if (vflag > 1) 4878876Srgrimes ls_list(arcn, now, listf); 4881541Srgrimes else { 4891541Srgrimes (void)fputs(arcn->name, listf); 4901541Srgrimes vfpart = 1; 4911541Srgrimes } 4921541Srgrimes } 4931541Srgrimes ++flcnt; 4948876Srgrimes 4951541Srgrimes /* 4961541Srgrimes * looks safe to store the file, have the format specific 4978876Srgrimes * routine write routine store the file header on the archive 4981541Srgrimes */ 4991541Srgrimes if ((res = (*wrf)(arcn)) < 0) { 5001541Srgrimes rdfile_close(arcn, &fd); 5011541Srgrimes break; 5021541Srgrimes } 5038876Srgrimes wr_one = 1; 5041541Srgrimes if (res > 0) { 5051541Srgrimes /* 5061541Srgrimes * format write says no file data needs to be stored 5071541Srgrimes * so we are done messing with this file 5081541Srgrimes */ 5091541Srgrimes if (vflag && vfpart) { 5101541Srgrimes (void)putc('\n', listf); 5111541Srgrimes vfpart = 0; 5121541Srgrimes } 5131541Srgrimes rdfile_close(arcn, &fd); 5141541Srgrimes continue; 5151541Srgrimes } 5161541Srgrimes 5171541Srgrimes /* 5181541Srgrimes * Add file data to the archive, quit on write error. if we 5191541Srgrimes * cannot write the entire file contents to the archive we 5201541Srgrimes * must pad the archive to replace the missing file data 5211541Srgrimes * (otherwise during an extract the file header for the file 5228876Srgrimes * which FOLLOWS this one will not be where we expect it to 5231541Srgrimes * be). 5241541Srgrimes */ 5251541Srgrimes res = (*frmt->wr_data)(arcn, fd, &cnt); 5261541Srgrimes rdfile_close(arcn, &fd); 5272604Sdfr if (vflag && vfpart) { 5281541Srgrimes (void)putc('\n', listf); 5291541Srgrimes vfpart = 0; 5301541Srgrimes } 5311541Srgrimes if (res < 0) 5321541Srgrimes break; 5331541Srgrimes 5341541Srgrimes /* 5351541Srgrimes * pad as required, cnt is number of bytes not written 5361541Srgrimes */ 5371541Srgrimes if (((cnt > 0) && (wr_skip(cnt) < 0)) || 5381541Srgrimes ((arcn->pad > 0) && (wr_skip(arcn->pad) < 0))) 5391541Srgrimes break; 5401541Srgrimes } 5411541Srgrimes 5421541Srgrimes /* 5431541Srgrimes * tell format to write trailer; pad to block boundary; reset directory 5441541Srgrimes * mode/access times, and check if all patterns supplied by the user 5458876Srgrimes * were matched. block off signals to avoid chance for multiple entry 5461541Srgrimes * into the cleanup code 5471541Srgrimes */ 5481541Srgrimes if (wr_one) { 5491541Srgrimes (*frmt->end_wr)(); 5501541Srgrimes wr_fin(); 5511541Srgrimes } 5521541Srgrimes (void)sigprocmask(SIG_BLOCK, &s_mask, NULL); 5531541Srgrimes ar_close(); 5541541Srgrimes if (tflag) 5551541Srgrimes proc_dir(); 5561541Srgrimes ftree_chk(); 5571541Srgrimes} 5581541Srgrimes 5591541Srgrimes/* 5601541Srgrimes * append() 5611541Srgrimes * Add file to previously written archive. Archive format specified by the 5621541Srgrimes * user must agree with archive. The archive is read first to collect 5631541Srgrimes * modification times (if -u) and locate the archive trailer. The archive 5641541Srgrimes * is positioned in front of the record with the trailer and wr_archive() 5651541Srgrimes * is called to add the new members. 5668876Srgrimes * PAX IMPLEMENTATION DETAIL NOTE: 5671541Srgrimes * -u is implemented by adding the new members to the end of the archive. 5681541Srgrimes * Care is taken so that these do not end up as links to the older 5691541Srgrimes * version of the same file already stored in the archive. It is expected 5708876Srgrimes * when extraction occurs these newer versions will over-write the older 5711541Srgrimes * ones stored "earlier" in the archive (this may be a bad assumption as 5721541Srgrimes * it depends on the implementation of the program doing the extraction). 5731541Srgrimes * It is really difficult to splice in members without either re-writing 5748876Srgrimes * the entire archive (from the point were the old version was), or having 5758876Srgrimes * assistance of the format specification in terms of a special update 5768876Srgrimes * header that invalidates a previous archive record. The POSIX spec left 5771541Srgrimes * the method used to implement -u unspecified. This pax is able to 5781541Srgrimes * over write existing files that it creates. 5791541Srgrimes */ 5801541Srgrimes 5811541Srgrimes#ifdef __STDC__ 5821541Srgrimesvoid 5831541Srgrimesappend(void) 5841541Srgrimes#else 5851541Srgrimesvoid 5861541Srgrimesappend() 5871541Srgrimes#endif 5881541Srgrimes{ 5891541Srgrimes register ARCHD *arcn; 5901541Srgrimes register int res; 5911541Srgrimes ARCHD archd; 5921541Srgrimes FSUB *orgfrmt; 5931541Srgrimes int udev; 5941541Srgrimes off_t tlen; 5951541Srgrimes 5961541Srgrimes arcn = &archd; 5971541Srgrimes orgfrmt = frmt; 5981541Srgrimes 5991541Srgrimes /* 6008876Srgrimes * Do not allow an append operation if the actual archive is of a 6011541Srgrimes * different format than the user specified format. 6021541Srgrimes */ 6031541Srgrimes if (get_arc() < 0) 6041541Srgrimes return; 6051541Srgrimes if ((orgfrmt != NULL) && (orgfrmt != frmt)) { 6061541Srgrimes paxwarn(1, "Cannot mix current archive format %s with %s", 6071541Srgrimes frmt->name, orgfrmt->name); 6088876Srgrimes return; 6091541Srgrimes } 6101541Srgrimes 6111541Srgrimes /* 6121541Srgrimes * pass the format any options and start up format 6138876Srgrimes */ 6141541Srgrimes if (((*frmt->options)() < 0) || ((*frmt->st_rd)() < 0)) 6151541Srgrimes return; 6161541Srgrimes 6178876Srgrimes /* 6181541Srgrimes * if we only are adding members that are newer, we need to save the 6191541Srgrimes * mod times for all files we see. 6201541Srgrimes */ 6218876Srgrimes if (uflag && (ftime_start() < 0)) 6228876Srgrimes return; 6231541Srgrimes 6241541Srgrimes /* 6251541Srgrimes * some archive formats encode hard links by recording the device and 6261541Srgrimes * file serial number (inode) but copy the file anyway (multiple times) 6271541Srgrimes * to the archive. When we append, we run the risk that newly added 6281541Srgrimes * files may have the same device and inode numbers as those recorded 6291541Srgrimes * on the archive but during a previous run. If this happens, when the 6301541Srgrimes * archive is extracted we get INCORRECT hard links. We avoid this by 6311541Srgrimes * remapping the device numbers so that newly added files will never 6321541Srgrimes * use the same device number as one found on the archive. remapping 6331541Srgrimes * allows new members to safely have links among themselves. remapping 6341541Srgrimes * also avoids problems with file inode (serial number) truncations 6351541Srgrimes * when the inode number is larger than storage space in the archive 6361541Srgrimes * header. See the remap routines for more details. 6371541Srgrimes */ 6381541Srgrimes if ((udev = frmt->udev) && (dev_start() < 0)) 6391541Srgrimes return; 6401541Srgrimes 6411541Srgrimes /* 6428876Srgrimes * reading the archive may take a long time. If verbose tell the user 6431541Srgrimes */ 6441541Srgrimes if (vflag) { 6451541Srgrimes (void)fprintf(listf, 6461541Srgrimes "%s: Reading archive to position at the end...", argv0); 6471541Srgrimes vfpart = 1; 6481541Srgrimes } 6491541Srgrimes 6508876Srgrimes /* 6511541Srgrimes * step through the archive until the format says it is done 6521541Srgrimes */ 6531541Srgrimes while (next_head(arcn) == 0) { 6541541Srgrimes /* 6551541Srgrimes * check if this file meets user specified options. 6561541Srgrimes */ 6571541Srgrimes if (sel_chk(arcn) != 0) { 6581541Srgrimes if (rd_skip(arcn->skip + arcn->pad) == 1) 6591541Srgrimes break; 6601541Srgrimes continue; 6611541Srgrimes } 6621541Srgrimes 6631541Srgrimes if (uflag) { 6641541Srgrimes /* 6651541Srgrimes * see if this is the newest version of this file has 6661541Srgrimes * already been seen, if so skip. 6671541Srgrimes */ 6681541Srgrimes if ((res = chk_ftime(arcn)) < 0) 6691541Srgrimes break; 6701541Srgrimes if (res > 0) { 6711541Srgrimes if (rd_skip(arcn->skip + arcn->pad) == 1) 6728876Srgrimes break; 6731541Srgrimes continue; 6741541Srgrimes } 6751541Srgrimes } 6761541Srgrimes 6771541Srgrimes /* 6781541Srgrimes * Store this device number. Device numbers seen during the 6791541Srgrimes * read phase of append will cause newly appended files with a 6801541Srgrimes * device number seen in the old part of the archive to be 6811541Srgrimes * remapped to an unused device number. 6828876Srgrimes */ 6831541Srgrimes if ((udev && (add_dev(arcn) < 0)) || 6841541Srgrimes (rd_skip(arcn->skip + arcn->pad) == 1)) 6851541Srgrimes break; 6861541Srgrimes } 6878876Srgrimes 6881541Srgrimes /* 6891541Srgrimes * done, finish up read and get the number of bytes to back up so we 690 * can add new members. The format might have used the hard link table, 691 * purge it. 692 */ 693 tlen = (*frmt->end_rd)(); 694 lnk_end(); 695 696 /* 697 * try to position for write, if this fails quit. if any error occurs, 698 * we will refuse to write 699 */ 700 if (appnd_start(tlen) < 0) 701 return; 702 703 /* 704 * tell the user we are done reading. 705 */ 706 if (vflag && vfpart) { 707 (void)fputs("done.\n", listf); 708 vfpart = 0; 709 } 710 711 /* 712 * go to the writing phase to add the new members 713 */ 714 wr_archive(arcn, 1); 715} 716 717/* 718 * archive() 719 * write a new archive 720 */ 721 722#ifdef __STDC__ 723void 724archive(void) 725#else 726void 727archive() 728#endif 729{ 730 ARCHD archd; 731 732 /* 733 * if we only are adding members that are newer, we need to save the 734 * mod times for all files; set up for writing; pass the format any 735 * options write the archive 736 */ 737 if ((uflag && (ftime_start() < 0)) || (wr_start() < 0)) 738 return; 739 if ((*frmt->options)() < 0) 740 return; 741 742 wr_archive(&archd, 0); 743} 744 745/* 746 * copy() 747 * copy files from one part of the file system to another. this does not 748 * use any archive storage. The EFFECT OF THE COPY IS THE SAME as if an 749 * archive was written and then extracted in the destination directory 750 * (except the files are forced to be under the destination directory). 751 */ 752 753#ifdef __STDC__ 754void 755copy(void) 756#else 757void 758copy() 759#endif 760{ 761 register ARCHD *arcn; 762 register int res; 763 register int fddest; 764 register char *dest_pt; 765 register int dlen; 766 register int drem; 767 int fdsrc = -1; 768 struct stat sb; 769 ARCHD archd; 770 char dirbuf[PAXPATHLEN+1]; 771 772 arcn = &archd; 773 /* 774 * set up the destination dir path and make sure it is a directory. We 775 * make sure we have a trailing / on the destination 776 */ 777 dlen = l_strncpy(dirbuf, dirptr, sizeof(dirbuf) - 1); 778 dest_pt = dirbuf + dlen; 779 if (*(dest_pt-1) != '/') { 780 *dest_pt++ = '/'; 781 ++dlen; 782 } 783 *dest_pt = '\0'; 784 drem = PAXPATHLEN - dlen; 785 786 if (stat(dirptr, &sb) < 0) { 787 syswarn(1, errno, "Cannot access destination directory %s", 788 dirptr); 789 return; 790 } 791 if (!S_ISDIR(sb.st_mode)) { 792 paxwarn(1, "Destination is not a directory %s", dirptr); 793 return; 794 } 795 796 /* 797 * start up the hard link table; file traversal routines and the 798 * modification time and access mode database 799 */ 800 if ((lnk_start() < 0) || (ftree_start() < 0) || (dir_start() < 0)) 801 return; 802 803 /* 804 * When we are doing interactive rename, we store the mapping of names 805 * so we can fix up hard links files later in the archive. 806 */ 807 if (iflag && (name_start() < 0)) 808 return; 809 810 /* 811 * set up to cp file trees 812 */ 813 cp_start(); 814 815 /* 816 * while there are files to archive, process them 817 */ 818 while (next_file(arcn) == 0) { 819 fdsrc = -1; 820 821 /* 822 * check if this file meets user specified options 823 */ 824 if (sel_chk(arcn) != 0) 825 continue; 826 827 /* 828 * if there is already a file in the destination directory with 829 * the same name and it is newer, skip the one stored on the 830 * archive. 831 * NOTE: this test is done BEFORE name modifications as 832 * specified by pax. this can be confusing to the user who 833 * might expect the test to be done on an existing file AFTER 834 * the name mod. In honesty the pax spec is probably flawed in 835 * this respect 836 */ 837 if (uflag || Dflag) { 838 /* 839 * create the destination name 840 */ 841 if (*(arcn->name) == '/') 842 res = 1; 843 else 844 res = 0; 845 if ((arcn->nlen - res) > drem) { 846 paxwarn(1, "Destination pathname too long %s", 847 arcn->name); 848 continue; 849 } 850 (void)strncpy(dest_pt, arcn->name + res, drem); 851 dirbuf[PAXPATHLEN] = '\0'; 852 853 /* 854 * if existing file is same age or newer skip 855 */ 856 res = lstat(dirbuf, &sb); 857 *dest_pt = '\0'; 858 859 if (res == 0) { 860 if (uflag && Dflag) { 861 if ((arcn->sb.st_mtime<=sb.st_mtime) && 862 (arcn->sb.st_ctime<=sb.st_ctime)) 863 continue; 864 } else if (Dflag) { 865 if (arcn->sb.st_ctime <= sb.st_ctime) 866 continue; 867 } else if (arcn->sb.st_mtime <= sb.st_mtime) 868 continue; 869 } 870 } 871 872 /* 873 * this file is considered selected. See if this is a hard link 874 * to a previous file; modify the name as requested by the 875 * user; set the final destination. 876 */ 877 ftree_sel(arcn); 878 if ((chk_lnk(arcn) < 0) || ((res = mod_name(arcn)) < 0)) 879 break; 880 if ((res > 0) || (set_dest(arcn, dirbuf, dlen) < 0)) { 881 /* 882 * skip file, purge from link table 883 */ 884 purg_lnk(arcn); 885 continue; 886 } 887 888 /* 889 * Non standard -Y and -Z flag. When the exisiting file is 890 * same age or newer skip 891 */ 892 if ((Yflag || Zflag) && ((lstat(arcn->name, &sb) == 0))) { 893 if (Yflag && Zflag) { 894 if ((arcn->sb.st_mtime <= sb.st_mtime) && 895 (arcn->sb.st_ctime <= sb.st_ctime)) 896 continue; 897 } else if (Yflag) { 898 if (arcn->sb.st_ctime <= sb.st_ctime) 899 continue; 900 } else if (arcn->sb.st_mtime <= sb.st_mtime) 901 continue; 902 } 903 904 if (vflag) { 905 (void)fputs(arcn->name, listf); 906 vfpart = 1; 907 } 908 ++flcnt; 909 910 /* 911 * try to create a hard link to the src file if requested 912 * but make sure we are not trying to overwrite ourselves. 913 */ 914 if (lflag) 915 res = cross_lnk(arcn); 916 else 917 res = chk_same(arcn); 918 if (res <= 0) { 919 if (vflag && vfpart) { 920 (void)putc('\n', listf); 921 vfpart = 0; 922 } 923 continue; 924 } 925 926 /* 927 * have to create a new file 928 */ 929 if ((arcn->type != PAX_REG) && (arcn->type != PAX_CTG)) { 930 /* 931 * create a link or special file 932 */ 933 if ((arcn->type == PAX_HLK) || (arcn->type == PAX_HRG)) 934 res = lnk_creat(arcn); 935 else 936 res = node_creat(arcn); 937 if (res < 0) 938 purg_lnk(arcn); 939 if (vflag && vfpart) { 940 (void)putc('\n', listf); 941 vfpart = 0; 942 } 943 continue; 944 } 945 946 /* 947 * have to copy a regular file to the destination directory. 948 * first open source file and then create the destination file 949 */ 950 if ((fdsrc = open(arcn->org_name, O_RDONLY, 0)) < 0) { 951 syswarn(1, errno, "Unable to open %s to read", 952 arcn->org_name); 953 purg_lnk(arcn); 954 continue; 955 } 956 if ((fddest = file_creat(arcn)) < 0) { 957 rdfile_close(arcn, &fdsrc); 958 purg_lnk(arcn); 959 continue; 960 } 961 962 /* 963 * copy source file data to the destination file 964 */ 965 cp_file(arcn, fdsrc, fddest); 966 file_close(arcn, fddest); 967 rdfile_close(arcn, &fdsrc); 968 969 if (vflag && vfpart) { 970 (void)putc('\n', listf); 971 vfpart = 0; 972 } 973 } 974 975 /* 976 * restore directory modes and times as required; make sure all 977 * patterns were selected block off signals to avoid chance for 978 * multiple entry into the cleanup code. 979 */ 980 (void)sigprocmask(SIG_BLOCK, &s_mask, NULL); 981 ar_close(); 982 proc_dir(); 983 ftree_chk(); 984} 985 986/* 987 * next_head() 988 * try to find a valid header in the archive. Uses format specific 989 * routines to extract the header and id the trailer. Trailers may be 990 * located within a valid header or in an invalid header (the location 991 * is format specific. The inhead field from the option table tells us 992 * where to look for the trailer). 993 * We keep reading (and resyncing) until we get enough contiguous data 994 * to check for a header. If we cannot find one, we shift by a byte 995 * add a new byte from the archive to the end of the buffer and try again. 996 * If we get a read error, we throw out what we have (as we must have 997 * contiguous data) and start over again. 998 * ASSUMED: headers fit within a BLKMULT header. 999 * Return: 1000 * 0 if we got a header, -1 if we are unable to ever find another one 1001 * (we reached the end of input, or we reached the limit on retries. see 1002 * the specs for rd_wrbuf() for more details) 1003 */ 1004 1005#ifdef __STDC__ 1006static int 1007next_head(register ARCHD *arcn) 1008#else 1009static int 1010next_head(arcn) 1011 register ARCHD *arcn; 1012#endif 1013{ 1014 register int ret; 1015 register char *hdend; 1016 register int res; 1017 register int shftsz; 1018 register int hsz; 1019 register int in_resync = 0; /* set when we are in resync mode */ 1020 int cnt = 0; /* counter for trailer function */ 1021 int first = 1; /* on 1st read, EOF isn't premature. */ 1022 1023 /* 1024 * set up initial conditions, we want a whole frmt->hsz block as we 1025 * have no data yet. 1026 */ 1027 res = hsz = frmt->hsz; 1028 hdend = hdbuf; 1029 shftsz = hsz - 1; 1030 for(;;) { 1031 /* 1032 * keep looping until we get a contiguous FULL buffer 1033 * (frmt->hsz is the proper size) 1034 */ 1035 for (;;) { 1036 if ((ret = rd_wrbuf(hdend, res)) == res) 1037 break; 1038 1039 /* 1040 * If we read 0 bytes (EOF) from an archive when we 1041 * expect to find a header, we have stepped upon 1042 * an archive without the customary block of zeroes 1043 * end marker. It's just stupid to error out on 1044 * them, so exit gracefully. 1045 */ 1046 if (first && ret == 0) 1047 return(-1); 1048 first = 0; 1049 1050 /* 1051 * some kind of archive read problem, try to resync the 1052 * storage device, better give the user the bad news. 1053 */ 1054 if ((ret == 0) || (rd_sync() < 0)) { 1055 paxwarn(1,"Premature end of file on archive read"); 1056 return(-1); 1057 } 1058 if (!in_resync) { 1059 if (act == APPND) { 1060 paxwarn(1, 1061 "Archive I/O error, cannot continue"); 1062 return(-1); 1063 } 1064 paxwarn(1,"Archive I/O error. Trying to recover."); 1065 ++in_resync; 1066 } 1067 1068 /* 1069 * oh well, throw it all out and start over 1070 */ 1071 res = hsz; 1072 hdend = hdbuf; 1073 } 1074 1075 /* 1076 * ok we have a contiguous buffer of the right size. Call the 1077 * format read routine. If this was not a valid header and this 1078 * format stores trailers outside of the header, call the 1079 * format specific trailer routine to check for a trailer. We 1080 * have to watch out that we do not mis-identify file data or 1081 * block padding as a header or trailer. Format specific 1082 * trailer functions must NOT check for the trailer while we 1083 * are running in resync mode. Some trailer functions may tell 1084 * us that this block cannot contain a valid header either, so 1085 * we then throw out the entire block and start over. 1086 */ 1087 if ((*frmt->rd)(arcn, hdbuf) == 0) 1088 break; 1089 1090 if (!frmt->inhead) { 1091 /* 1092 * this format has trailers outside of valid headers 1093 */ 1094 if ((ret = (*frmt->trail)(hdbuf,in_resync,&cnt)) == 0){ 1095 /* 1096 * valid trailer found, drain input as required 1097 */ 1098 ar_drain(); 1099 return(-1); 1100 } 1101 1102 if (ret == 1) { 1103 /* 1104 * we are in resync and we were told to throw 1105 * the whole block out because none of the 1106 * bytes in this block can be used to form a 1107 * valid header 1108 */ 1109 res = hsz; 1110 hdend = hdbuf; 1111 continue; 1112 } 1113 } 1114 1115 /* 1116 * Brute force section. 1117 * not a valid header. We may be able to find a header yet. So 1118 * we shift over by one byte, and set up to read one byte at a 1119 * time from the archive and place it at the end of the buffer. 1120 * We will keep moving byte at a time until we find a header or 1121 * get a read error and have to start over. 1122 */ 1123 if (!in_resync) { 1124 if (act == APPND) { 1125 paxwarn(1,"Unable to append, archive header flaw"); 1126 return(-1); 1127 } 1128 paxwarn(1,"Invalid header, starting valid header search."); 1129 ++in_resync; 1130 } 1131 memmove(hdbuf, hdbuf+1, shftsz); 1132 res = 1; 1133 hdend = hdbuf + shftsz; 1134 } 1135 1136 /* 1137 * ok got a valid header, check for trailer if format encodes it in the 1138 * the header. NOTE: the parameters are different than trailer routines 1139 * which encode trailers outside of the header! 1140 */ 1141 if (frmt->inhead && ((*frmt->trail)(arcn) == 0)) { 1142 /* 1143 * valid trailer found, drain input as required 1144 */ 1145 ar_drain(); 1146 return(-1); 1147 } 1148 1149 ++flcnt; 1150 return(0); 1151} 1152 1153/* 1154 * get_arc() 1155 * Figure out what format an archive is. Handles archive with flaws by 1156 * brute force searches for a legal header in any supported format. The 1157 * format id routines have to be careful to NOT mis-identify a format. 1158 * ASSUMED: headers fit within a BLKMULT header. 1159 * Return: 1160 * 0 if archive found -1 otherwise 1161 */ 1162 1163#ifdef __STDC__ 1164static int 1165get_arc(void) 1166#else 1167static int 1168get_arc() 1169#endif 1170{ 1171 register int i; 1172 register int hdsz = 0; 1173 register int res; 1174 register int minhd = BLKMULT; 1175 char *hdend; 1176 int notice = 0; 1177 1178 /* 1179 * find the smallest header size in all archive formats and then set up 1180 * to read the archive. 1181 */ 1182 for (i = 0; ford[i] >= 0; ++i) { 1183 if (fsub[ford[i]].hsz < minhd) 1184 minhd = fsub[ford[i]].hsz; 1185 } 1186 if (rd_start() < 0) 1187 return(-1); 1188 res = BLKMULT; 1189 hdsz = 0; 1190 hdend = hdbuf; 1191 for(;;) { 1192 for (;;) { 1193 /* 1194 * fill the buffer with at least the smallest header 1195 */ 1196 i = rd_wrbuf(hdend, res); 1197 if (i > 0) 1198 hdsz += i; 1199 if (hdsz >= minhd) 1200 break; 1201 1202 /* 1203 * if we cannot recover from a read error quit 1204 */ 1205 if ((i == 0) || (rd_sync() < 0)) 1206 goto out; 1207 1208 /* 1209 * when we get an error none of the data we already 1210 * have can be used to create a legal header (we just 1211 * got an error in the middle), so we throw it all out 1212 * and refill the buffer with fresh data. 1213 */ 1214 res = BLKMULT; 1215 hdsz = 0; 1216 hdend = hdbuf; 1217 if (!notice) { 1218 if (act == APPND) 1219 return(-1); 1220 paxwarn(1,"Cannot identify format. Searching..."); 1221 ++notice; 1222 } 1223 } 1224 1225 /* 1226 * we have at least the size of the smallest header in any 1227 * archive format. Look to see if we have a match. The array 1228 * ford[] is used to specify the header id order to reduce the 1229 * chance of incorrectly id'ing a valid header (some formats 1230 * may be subsets of each other and the order would then be 1231 * important). 1232 */ 1233 for (i = 0; ford[i] >= 0; ++i) { 1234 if ((*fsub[ford[i]].id)(hdbuf, hdsz) < 0) 1235 continue; 1236 frmt = &(fsub[ford[i]]); 1237 /* 1238 * yuck, to avoid slow special case code in the extract 1239 * routines, just push this header back as if it was 1240 * not seen. We have left extra space at start of the 1241 * buffer for this purpose. This is a bit ugly, but 1242 * adding all the special case code is far worse. 1243 */ 1244 pback(hdbuf, hdsz); 1245 return(0); 1246 } 1247 1248 /* 1249 * We have a flawed archive, no match. we start searching, but 1250 * we never allow additions to flawed archives 1251 */ 1252 if (!notice) { 1253 if (act == APPND) 1254 return(-1); 1255 paxwarn(1, "Cannot identify format. Searching..."); 1256 ++notice; 1257 } 1258 1259 /* 1260 * brute force search for a header that we can id. 1261 * we shift through byte at a time. this is slow, but we cannot 1262 * determine the nature of the flaw in the archive in a 1263 * portable manner 1264 */ 1265 if (--hdsz > 0) { 1266 memmove(hdbuf, hdbuf+1, hdsz); 1267 res = BLKMULT - hdsz; 1268 hdend = hdbuf + hdsz; 1269 } else { 1270 res = BLKMULT; 1271 hdend = hdbuf; 1272 hdsz = 0; 1273 } 1274 } 1275 1276 out: 1277 /* 1278 * we cannot find a header, bow, apologize and quit 1279 */ 1280 paxwarn(1, "Sorry, unable to determine archive format."); 1281 return(-1); 1282} 1283