/*
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Ken Smith of The State University of New York at Buffalo.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1989 The Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)mv.c	5.13 (Berkeley) 04/29/93";
#endif /* not lint */

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

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "pathnames.h"

int fflg, iflg;

int	copy __P((char *, char *));
int	do_move __P((char *, char *));
int	fastcopy __P((char *, char *, struct stat *));
void	usage __P((void));

int
main(argc, argv)
	int argc;
	char *argv[];
{
	register int baselen, exitval, len;
	register char *p, *endp;
	struct stat sb;
	int ch;
	char path[MAXPATHLEN + 1];

	while (((ch = getopt(argc, argv, "-if")) != EOF))
		switch((char)ch) {
		case 'i':
			iflg = 1;
			break;
		case 'f':
			fflg = 1;
			break;
		case '-':		/* Undocumented; for compatibility. */
			goto endarg;
		case '?':
		default:
			usage();
		}
endarg:	argc -= optind;
	argv += optind;

	if (argc < 2)
		usage();

	/*
	 * If the stat on the target fails or the target isn't a directory,
	 * try the move.  More than 2 arguments is an error in this case.
	 */
	if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) {
		if (argc > 2)
			usage();
		exit(do_move(argv[0], argv[1]));
	}

	/* It's a directory, move each file into it. */
	(void)strcpy(path, argv[argc - 1]);
	baselen = strlen(path);
	endp = &path[baselen];
	*endp++ = '/';
	++baselen;
	for (exitval = 0; --argc; ++argv) {
		if ((p = strrchr(*argv, '/')) == NULL)
			p = *argv;
		else
			++p;
		if ((baselen + (len = strlen(p))) >= MAXPATHLEN) {
			warnx("%s: destination pathname too long", *argv);
			exitval = 1;
		} else {
			memmove(endp, p, len + 1);
			exitval |= do_move(*argv, path);
		}
	}
	exit(exitval);
}

int
do_move(from, to)
	char *from, *to;
{
	struct stat sb;
	int ask, ch;

	/*
	 * Check access.  If interactive and file exists, ask user if it
	 * should be replaced.  Otherwise if file exists but isn't writable
	 * make sure the user wants to clobber it.
	 */
	if (!fflg && !access(to, F_OK)) {
		ask = 0;
		if (iflg) {
			(void)fprintf(stderr, "overwrite %s? ", to);
			ask = 1;
		}
		else if (access(to, W_OK) && !stat(to, &sb)) {
			(void)fprintf(stderr, "override mode %o on %s? ",
			    sb.st_mode & 07777, to);
			ask = 1;
		}
		if (ask) {
			if ((ch = getchar()) != EOF && ch != '\n')
				while (getchar() != '\n');
			if (ch != 'y')
				return (0);
		}
	}
	if (!rename(from, to))
		return (0);

	if (errno != EXDEV) {
		warn("rename %s to %s", from, to);
		return (1);
	}

	/*
	 * If rename fails, and it's a regular file, do the copy internally;
	 * otherwise, use cp and rm.
	 */
	if (stat(from, &sb)) {
		warn("%s", from);
		return (1);
	}
	return (S_ISREG(sb.st_mode) ?
	    fastcopy(from, to, &sb) : copy(from, to));
}

int
fastcopy(from, to, sbp)
	char *from, *to;
	struct stat *sbp;
{
	struct timeval tval[2];
	static u_int blen;
	static char *bp;
	register int nread, from_fd, to_fd;

	if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
		warn("%s", from);
		return (1);
	}
	if ((to_fd = open(to, O_CREAT|O_TRUNC|O_WRONLY, sbp->st_mode)) < 0) {
		warn("%s", to);
		(void)close(from_fd);
		return (1);
	}
	if (!blen && !(bp = malloc(blen = sbp->st_blksize))) {
		warn(NULL);
		return (1);
	}
	while ((nread = read(from_fd, bp, blen)) > 0)
		if (write(to_fd, bp, nread) != nread) {
			warn("%s", to);
			goto err;
		}
	if (nread < 0) {
		warn("%s", from);
err:		if (unlink(to))
			warn("%s: remove", to);
		(void)close(from_fd);
		(void)close(to_fd);
		return (1);
	}
	(void)close(from_fd);

	if (fchown(to_fd, sbp->st_uid, sbp->st_gid))
		warn("%s: set owner/group", to);
	if (fchmod(to_fd, sbp->st_mode))
		warn("%s: set mode", to);

	tval[0].tv_sec = sbp->st_atime;
	tval[1].tv_sec = sbp->st_mtime;
	tval[0].tv_usec = tval[1].tv_usec = 0;
	if (utimes(to, tval))
		warn("%s: set times", to);

	if (close(to_fd)) {
		warn("%s", to);
		return (1);
	}

	if (unlink(from)) {
		warn("%s: remove", from);
		return (1);
	}
	return (0);
}

int
copy(from, to)
	char *from, *to;
{
	int pid, status;

	if (!(pid = vfork())) {
		execl(_PATH_CP, "mv", "-pR", from, to, NULL);
		warn("%s", _PATH_CP);
		_exit(1);
	}
	if (waitpid(pid, &status, 0) == -1) {
		warn("%s: waitpid", _PATH_CP);
		return (1);
	}
	if (!WIFEXITED(status)) {
		warn("%s: did not terminate normally", _PATH_CP);
		return (1);
	}
	if (WEXITSTATUS(status)) {
		warn("%s: terminated with %d (non-zero) status",
		    _PATH_CP, WEXITSTATUS(status));
		return (1);
	}
	if (!(pid = vfork())) {
		execl(_PATH_RM, "mv", "-rf", from, NULL);
		warn("%s", _PATH_RM);
		_exit(1);
	}
	if (waitpid(pid, &status, 0) == -1) {
		warn("%s: waitpid", _PATH_RM);
		return (1);
	}
	if (!WIFEXITED(status)) {
		warn("%s: did not terminate normally", _PATH_RM);
		return (1);
	}
	if (WEXITSTATUS(status)) {
		warn("%s: terminated with %d (non-zero) status",
		    _PATH_RM, WEXITSTATUS(status));
		return (1);
	}
	return (0);
}

void
usage()
{
	(void)fprintf(stderr,
"usage: mv [-if] src target;\n   or: mv [-if] src1 ... srcN directory\n");
	exit(1);
}