usr.bin/ar/replace.c

   1 /*-
   2  * Copyright (c) 1990, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Hugh Smith at The University of Guelph.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  * @(#)replace.c        8.3 (Berkeley) 4/2/94
  37  *
  38  * $DragonFly: src/usr.bin/ar/replace.c,v 1.4 2005/01/13 19:57:56 okumoto Exp $
  39  */
  40
  41 #include <sys/param.h>
  42 #include <sys/stat.h>
  43
  44 #include <ar.h>
  45 #include <dirent.h>
  46 #include <err.h>
  47 #include <fcntl.h>
  48 #include <stdio.h>
  49 #include <string.h>
  50 #include <unistd.h>
  51
  52 #include "archive.h"
  53 #include "extern.h"
  54
  55 /*
  56  * replace --
  57  *      Replace or add named members to archive.  Entries already in the
  58  *      archive are swapped in place.  Others are added before or after
  59  *      the key entry, based on the a, b and i options.  If the u option
  60  *      is specified, modification dates select for replacement.
  61  */
  62 int
  63 replace(char **argv)
  64 {
  65         char *file;
  66         int afd, curfd, errflg, exists, mods, sfd, tfd1, tfd2;
  67         struct stat sb;
  68         CF cf;
  69         off_t size, tsize;
  70
  71         errflg = 0;
  72         /*
  73          * If doesn't exist, simply append to the archive.  There's
  74          * a race here, but it's pretty short, and not worth fixing.
  75          */
  76         exists = !stat(archive, &sb);
  77         afd = open_archive(O_CREAT|O_RDWR);
  78
  79         if (!exists) {
  80                 tfd1 = -1;
  81                 tfd2 = tmp();
  82                 goto append;
  83         }
  84
  85         tfd1 = tmp();                   /* Files before key file. */
  86         tfd2 = tmp();                   /* Files after key file. */
  87
  88         /*
  89          * Break archive into two parts -- entries before and after the key
  90          * entry.  If positioning before the key, place the key at the
  91          * beginning of the after key entries and if positioning after the
  92          * key, place the key at the end of the before key entries.  Put it
  93          * all back together at the end.
  94          */
  95         mods = (options & (AR_A|AR_B));
  96         for (curfd = tfd1; get_arobj(afd);) {
  97                 if (*argv && (file = files(argv))) {
  98                         if ((sfd = open(file, O_RDONLY)) < 0) {
  99                                 errflg = 1;
 100                                 warn("%s", file);
 101                                 goto useold;
 102                         }
 103                         fstat(sfd, &sb);
 104                         if (options & AR_U && sb.st_mtime <= chdr.date) {
 105                                 close(sfd);
 106                                 goto useold;
 107                         }
 108
 109                         if (options & AR_V)
 110                              printf("r - %s\n", file);
 111
 112                         /* Read from disk, write to an archive; pad on write */
 113                         SETCF(sfd, file, curfd, tname, WPAD);
 114                         put_arobj(&cf, &sb);
 115                         close(sfd);
 116                         skip_arobj(afd);
 117                         continue;
 118                 }
 119
 120                 if (mods && compare(posname)) {
 121                         mods = 0;
 122                         if (options & AR_B)
 123                                 curfd = tfd2;
 124                         /* Read and write to an archive; pad on both. */
 125                         SETCF(afd, archive, curfd, tname, RPAD|WPAD);
 126                         put_arobj(&cf, (struct stat *)NULL);
 127                         if (options & AR_A)
 128                                 curfd = tfd2;
 129                 } else {
 130                         /* Read and write to an archive; pad on both. */
 131 useold:                 SETCF(afd, archive, curfd, tname, RPAD|WPAD);
 132                         put_arobj(&cf, (struct stat *)NULL);
 133                 }
 134         }
 135
 136         if (mods) {
 137                 warnx("%s: archive member not found", posarg);
 138                 close_archive(afd);
 139                 return (1);
 140         }
 141
 142         /* Append any left-over arguments to the end of the after file. */
 143 append: while ( (file = *argv++) ) {
 144                 if (options & AR_V)
 145                         printf("a - %s\n", file);
 146                 if ((sfd = open(file, O_RDONLY)) < 0) {
 147                         errflg = 1;
 148                         warn("%s", file);
 149                         continue;
 150                 }
 151                 fstat(sfd, &sb);
 152                 /* Read from disk, write to an archive; pad on write. */
 153                 SETCF(sfd, file,
 154                     options & (AR_A|AR_B) ? tfd1 : tfd2, tname, WPAD);
 155                 put_arobj(&cf, &sb);
 156                 close(sfd);
 157         }
 158
 159         lseek(afd, (off_t)SARMAG, SEEK_SET);
 160
 161         SETCF(tfd1, tname, afd, archive, NOPAD);
 162         if (tfd1 != -1) {
 163                 tsize = size = lseek(tfd1, (off_t)0, SEEK_CUR);
 164                 lseek(tfd1, (off_t)0, SEEK_SET);
 165                 copy_ar(&cf, size);
 166         } else
 167                 tsize = 0;
 168
 169         tsize += size = lseek(tfd2, (off_t)0, SEEK_CUR);
 170         lseek(tfd2, (off_t)0, SEEK_SET);
 171         cf.rfd = tfd2;
 172         copy_ar(&cf, size);
 173
 174         ftruncate(afd, tsize + SARMAG);
 175         close_archive(afd);
 176         return (errflg);
 177 }