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rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable).  these days, people use source.  these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

/*	$OpenBSD: replace.c,v 1.7 2009/10/27 23:59:35 deraadt Exp $	*/
/*	$NetBSD: replace.c,v 1.6 1995/03/26 03:28:01 glass Exp $	*/

/*-
 * 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. 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.
 */

#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(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) {
				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, 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, 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);
}