usr/src/usr.bin/ar/replace.c

/*-
 * Copyright (c) 1990, 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Hugh Smith at The University of Guelph.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char sccsid[] = "@(#)replace.c   8.4 (Berkeley) 4/27/95";
#endif /* not lint */

#include <sys/param.h>
#include <sys/stat.h>

#include <ar.h>
#include <dirent.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

#include "archive.h"
#include "extern.h"

/*
 * replace --
 *      Replace or add named members to archive.  Entries already in the
 *      archive are swapped in place.  Others are added before or after
 *      the key entry, based on the a, b and i options.  If the u option
 *      is specified, modification dates select for replacement.
 */
int
replace(argv)
        char **argv;
{
        char *file;
        int afd, curfd, errflg, exists, mods, sfd, tfd1, tfd2;
        struct stat sb;
        CF cf;
        off_t size, tsize;

        errflg = 0;
        /*
         * If doesn't exist, simply append to the archive.  There's
         * a race here, but it's pretty short, and not worth fixing.
         */
        exists = !stat(archive, &sb);
        afd = open_archive(O_CREAT|O_RDWR);

        if (!exists) {
                tfd1 = -1;
                tfd2 = tmp();
                goto append;
        }

        tfd1 = tmp();                   /* Files before key file. */
        tfd2 = tmp();                   /* Files after key file. */

        /*
         * Break archive into two parts -- entries before and after the key
         * entry.  If positioning before the key, place the key at the
         * beginning of the after key entries and if positioning after the
         * key, place the key at the end of the before key entries.  Put it
         * all back together at the end.
         */
        mods = (options & (AR_A|AR_B));
        for (curfd = tfd1; get_arobj(afd);) {
                if (*argv && (file = files(argv))) {
                        if ((sfd = open(file, O_RDONLY)) < 0) {
                                errflg = 1;
                                warn("%s", file);
                                goto useold;
                        }
                        (void)fstat(sfd, &sb);
                        if (options & AR_U && sb.st_mtime <= chdr.date) {
                                (void)close(sfd);
                                goto useold;
                        }

                        if (options & AR_V)
                             (void)printf("r - %s\n", file);

                        /* Read from disk, write to an archive; pad on write */
                        SETCF(sfd, file, curfd, tname, WPAD);
                        put_arobj(&cf, &sb);
                        (void)close(sfd);
                        skip_arobj(afd);
                        continue;
                }

                if (mods && compare(posname)) {
                        mods = 0;
                        if (options & AR_B)
                                curfd = tfd2;
                        /* Read and write to an archive; pad on both. */
                        SETCF(afd, archive, curfd, tname, RPAD|WPAD);
                        put_arobj(&cf, (struct stat *)NULL);
                        if (options & AR_A)
                                curfd = tfd2;
                } else {
                        /* Read and write to an archive; pad on both. */
useold:                 SETCF(afd, archive, curfd, tname, RPAD|WPAD);
                        put_arobj(&cf, (struct stat *)NULL);
                }
        }

        if (mods) {
                warnx("%s: archive member not found", posarg);
                close_archive(afd);
                return (1);
        }

        /* Append any left-over arguments to the end of the after file. */
append: while (file = *argv++) {
                if (options & AR_V)
                        (void)printf("a - %s\n", file);
                if ((sfd = open(file, O_RDONLY)) < 0) {
                        errflg = 1;
                        warn("%s", file);
                        continue;
                }
                (void)fstat(sfd, &sb);
                /* Read from disk, write to an archive; pad on write. */
                SETCF(sfd, file,
                    options & (AR_A|AR_B) ? tfd1 : tfd2, tname, WPAD);
                put_arobj(&cf, &sb);
                (void)close(sfd);
        }

        (void)lseek(afd, (off_t)SARMAG, SEEK_SET);

        SETCF(tfd1, tname, afd, archive, NOPAD);
        if (tfd1 != -1) {
                tsize = size = lseek(tfd1, (off_t)0, SEEK_CUR);
                (void)lseek(tfd1, (off_t)0, SEEK_SET);
                copy_ar(&cf, size);
        } else
                tsize = 0;

        tsize += size = lseek(tfd2, (off_t)0, SEEK_CUR);
        (void)lseek(tfd2, (off_t)0, SEEK_SET);
        cf.rfd = tfd2;
        copy_ar(&cf, size);

        (void)ftruncate(afd, tsize + SARMAG);
        close_archive(afd);
        return (errflg);
}