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Annotation of src/usr.bin/ar/replace.c, Revision 1.7

1.7     ! deraadt     1: /*     $OpenBSD: replace.c,v 1.6 2003/06/12 20:58:08 deraadt Exp $     */
1.1       deraadt     2: /*     $NetBSD: replace.c,v 1.6 1995/03/26 03:28:01 glass Exp $        */
                      3:
                      4: /*-
                      5:  * Copyright (c) 1990, 1993, 1994
                      6:  *     The Regents of the University of California.  All rights reserved.
                      7:  *
                      8:  * This code is derived from software contributed to Berkeley by
                      9:  * Hugh Smith at The University of Guelph.
                     10:  *
                     11:  * Redistribution and use in source and binary forms, with or without
                     12:  * modification, are permitted provided that the following conditions
                     13:  * are met:
                     14:  * 1. Redistributions of source code must retain the above copyright
                     15:  *    notice, this list of conditions and the following disclaimer.
                     16:  * 2. Redistributions in binary form must reproduce the above copyright
                     17:  *    notice, this list of conditions and the following disclaimer in the
                     18:  *    documentation and/or other materials provided with the distribution.
1.5       millert    19:  * 3. Neither the name of the University nor the names of its contributors
1.1       deraadt    20:  *    may be used to endorse or promote products derived from this software
                     21:  *    without specific prior written permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     24:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     25:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     26:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     27:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     28:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     29:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     33:  * SUCH DAMAGE.
                     34:  */
                     35:
                     36: #include <sys/param.h>
                     37: #include <sys/stat.h>
                     38:
                     39: #include <ar.h>
                     40: #include <dirent.h>
                     41: #include <err.h>
                     42: #include <fcntl.h>
                     43: #include <stdio.h>
                     44: #include <string.h>
                     45: #include <unistd.h>
                     46:
                     47: #include "archive.h"
                     48: #include "extern.h"
                     49:
                     50: /*
                     51:  * replace --
                     52:  *     Replace or add named members to archive.  Entries already in the
                     53:  *     archive are swapped in place.  Others are added before or after
                     54:  *     the key entry, based on the a, b and i options.  If the u option
                     55:  *     is specified, modification dates select for replacement.
                     56:  */
                     57: int
1.6       deraadt    58: replace(char **argv)
1.1       deraadt    59: {
                     60:        char *file;
                     61:        int afd, curfd, errflg, exists, mods, sfd, tfd1, tfd2;
                     62:        struct stat sb;
                     63:        CF cf;
                     64:        off_t size, tsize;
                     65:
                     66:        errflg = 0;
                     67:        /*
                     68:         * If doesn't exist, simply append to the archive.  There's
                     69:         * a race here, but it's pretty short, and not worth fixing.
                     70:         */
                     71:        exists = !stat(archive, &sb);
                     72:        afd = open_archive(O_CREAT|O_RDWR);
                     73:
                     74:        if (!exists) {
                     75:                tfd1 = -1;
                     76:                tfd2 = tmp();
                     77:                goto append;
                     78:        }
                     79:
                     80:        tfd1 = tmp();                   /* Files before key file. */
                     81:        tfd2 = tmp();                   /* Files after key file. */
                     82:
                     83:        /*
                     84:         * Break archive into two parts -- entries before and after the key
                     85:         * entry.  If positioning before the key, place the key at the
                     86:         * beginning of the after key entries and if positioning after the
                     87:         * key, place the key at the end of the before key entries.  Put it
                     88:         * all back together at the end.
                     89:         */
                     90:        mods = (options & (AR_A|AR_B));
                     91:        for (curfd = tfd1; get_arobj(afd);) {
                     92:                if (*argv && (file = files(argv))) {
                     93:                        if ((sfd = open(file, O_RDONLY)) < 0) {
                     94:                                errflg = 1;
                     95:                                warn("%s", file);
                     96:                                goto useold;
                     97:                        }
                     98:                        (void)fstat(sfd, &sb);
                     99:                        if (options & AR_U && sb.st_mtime <= chdr.date) {
                    100:                                close(sfd);
                    101:                                goto useold;
                    102:                        }
                    103:
                    104:                        if (options & AR_V)
                    105:                             (void)printf("r - %s\n", file);
                    106:
                    107:                        /* Read from disk, write to an archive; pad on write */
                    108:                        SETCF(sfd, file, curfd, tname, WPAD);
                    109:                        put_arobj(&cf, &sb);
                    110:                        (void)close(sfd);
                    111:                        skip_arobj(afd);
                    112:                        continue;
                    113:                }
                    114:
                    115:                if (mods && compare(posname)) {
                    116:                        mods = 0;
                    117:                        if (options & AR_B)
                    118:                                curfd = tfd2;
                    119:                        /* Read and write to an archive; pad on both. */
                    120:                        SETCF(afd, archive, curfd, tname, RPAD|WPAD);
1.3       kstailey  121:                        put_arobj(&cf, NULL);
1.1       deraadt   122:                        if (options & AR_A)
                    123:                                curfd = tfd2;
                    124:                } else {
                    125:                        /* Read and write to an archive; pad on both. */
                    126: useold:                        SETCF(afd, archive, curfd, tname, RPAD|WPAD);
1.3       kstailey  127:                        put_arobj(&cf, NULL);
1.1       deraadt   128:                }
                    129:        }
                    130:
                    131:        if (mods) {
                    132:                warnx("%s: archive member not found", posarg);
                    133:                 close_archive(afd);
                    134:                 return (1);
                    135:         }
                    136:
                    137:        /* Append any left-over arguments to the end of the after file. */
1.4       deraadt   138: append:        while ((file = *argv++)) {
1.1       deraadt   139:                if (options & AR_V)
                    140:                        (void)printf("a - %s\n", file);
                    141:                if ((sfd = open(file, O_RDONLY)) < 0) {
                    142:                        errflg = 1;
                    143:                        warn("%s", file);
                    144:                        continue;
                    145:                }
                    146:                (void)fstat(sfd, &sb);
                    147:                /* Read from disk, write to an archive; pad on write. */
                    148:                SETCF(sfd, file,
                    149:                    options & (AR_A|AR_B) ? tfd1 : tfd2, tname, WPAD);
                    150:                put_arobj(&cf, &sb);
                    151:                (void)close(sfd);
                    152:        }
                    153:
                    154:        (void)lseek(afd, (off_t)SARMAG, SEEK_SET);
                    155:
                    156:        SETCF(tfd1, tname, afd, archive, NOPAD);
                    157:        if (tfd1 != -1) {
                    158:                tsize = size = lseek(tfd1, (off_t)0, SEEK_CUR);
                    159:                (void)lseek(tfd1, (off_t)0, SEEK_SET);
                    160:                copy_ar(&cf, size);
                    161:        } else
                    162:                tsize = 0;
                    163:
                    164:        tsize += size = lseek(tfd2, (off_t)0, SEEK_CUR);
                    165:        (void)lseek(tfd2, (off_t)0, SEEK_SET);
                    166:        cf.rfd = tfd2;
                    167:        copy_ar(&cf, size);
                    168:
                    169:        (void)ftruncate(afd, tsize + SARMAG);
                    170:        close_archive(afd);
                    171:        return (errflg);
                    172: }