xref: /csrg-svn/bin/mv/mv.c (revision 10047)

#ifndef lint
static	char *sccsid = "@(#)mv.c	4.7 (Berkeley) 83/01/01";
#endif

/*
 * mv file1 file2
 */
#include <sys/param.h>
#include <sys/stat.h>

#include <stdio.h>
#include <dir.h>
#include <errno.h>
#include <signal.h>

#define	DELIM	'/'
#define MODEBITS 07777

#define	ISDIR(st)	(((st).st_mode&S_IFMT) == S_IFDIR)
#define	ISLNK(st)	(((st).st_mode&S_IFMT) == S_IFLNK)
#define	ISREG(st)	(((st).st_mode&S_IFMT) == S_IFREG)
#define	ISDEV(st) \
	(((st).st_mode&S_IFMT) == S_IFCHR || ((st).st_mode&S_IFMT) == S_IFBLK)

char	*sprintf();
char	*dname();
struct	stat s1, s2;
int	iflag = 0;	/* interactive mode */
int	fflag = 0;	/* force overwriting */
extern	unsigned errno;

main(argc, argv)
	register char *argv[];
{
	register i, r;
	register char *arg;

	if (argc < 2)
		goto usage;
	while (argc > 1 && *argv[1] == '-') {
		argc--;
		arg = *++argv;

		/*
		 * all files following a null option
		 * are considered file names
		 */
		if (*(arg+1) == '\0')
			break;
		while (*++arg != '\0') switch (*arg) {

		case 'i':
			iflag++;
			break;

		case 'f':
			fflag++;
			break;

		default:
			goto usage;
		}
	}
	if (argc < 3)
		goto usage;
	setuid(getuid());
	r = 0;
	if (argc > 3) {
		register char *dest;

		dest = argv[argc-1];
		if (stat(dest, &s2) < 0 || !ISDIR(s2))
			goto usage;
		for (i = 1; i < argc-1; i++)
			r |= movewithshortname(argv[i], dest);
		exit(r);
	}
	if (stat(argv[2], &s2) >= 0 && ISDIR(s2)) {
		struct stat s1;

		if (stat(argv[1], &s1) >= 0 && ISDIR(s1))
			r = move(argv[1], argv[2]);
		else
			r = movewithshortname(argv[1], argv[2]);
	} else
		r = move(argv[1], argv[2]);
	exit(r);
	/*NOTREACHED*/
usage:
	fprintf(stderr,
"usage: mv [-if] f1 ... fn d1 (where `fn' is a file or directory)\n");
	return (1);
}

movewithshortname(src, dest)
	char *src, *dest;
{
	register char *shortname;
	char target[MAXPATHLEN + 1];

	shortname = dname(src);
	if (strlen(dest) + strlen(shortname) > MAXPATHLEN - 1) {
		error("%s/%s: pathname too long", dest,
			shortname);
		return (1);
	}
	sprintf(target, "%s/%s", dest, shortname);
	return (move(src, target));
}

move(source, target)
	char *source, *target;
{

	if (lstat(source, &s1) < 0) {
		error("cannot access %s", source);
		return (1);
	}
	/*
	 * First, try to rename source to destination.
	 * The only reason we continue on failure is if
	 * the move is on a nondirectory and not across
	 * file systems.
	 */
	if (lstat(target, &s2) >= 0) {
		if (iflag && !fflag && query("remove %s? ", target) == 0)
			return (1);
		if (s1.st_dev == s2.st_dev && s1.st_ino == s2.st_ino) {
			error("%s and %s are identical", source, target);
			return (1);
		}
		if (access(target, 2) < 0 && !fflag && isatty(fileno(stdin))) {
			if (query("override protection %o for %s? ",
			  s2.st_mode & MODEBITS, target) == 0)
				return (1);
		}
		if (rename(source, target) >= 0)
			return (0);
		if (errno != EXDEV) {
			Perror2(source, "rename");
			return (1);
		}
		if (ISDIR(s1)) {
			error("can't mv directories across file systems");
			return (1);
		}
		if (unlink(target) < 0) {
			error("cannot unlink %s", target);
			return (1);
		}
	} else {
		if (rename(source, target) >= 0)
			return (0);
		if (ISDIR(s1)) {
			Perror2(source, "rename");
			return (1);
		}
	}
	/*
	 * File can't be renamed, try to recreate the symbolic
	 * link or special device, or copy the file wholesale
	 * between file systems.
	 */
	if (ISLNK(s1)) {
		register m;
		char symln[MAXPATHLEN];

		if (readlink(source, symln, sizeof (symln)) < 0) {
			Perror(source);
			return (1);
		}
		m = umask(~(s1.st_mode & MODEBITS));
		if (symlink(symln, target) < 0) {
			Perror(target);
			return (1);
		}
		(void) umask(m);
		goto cleanup;
	}
	if (ISDEV(s1)) {
		if (mknod(target, s1.st_mode, s1.st_rdev) < 0) {
			Perror(target);
			return (1);
		}
		(void) utime(target, &s1.st_atime);
		goto cleanup;
	}
	if (ISREG(s1)) {
		int i, c, status;

		i = fork();
		if (i == -1) {
			error("try again");
			return (1);
		}
		if (i == 0) {
			execl("/bin/cp", "cp", source, target, 0);
			error("cannot exec /bin/cp");
			exit(1);
		}
		while ((c = wait(&status)) != i && c != -1)
			;
		if (status != 0)
			return (1);
		(void) utime(target, &s1.st_atime);
		goto cleanup;
	}
	error("%s: unknown file type %o", source, s1.st_mode);
	return (1);

cleanup:
	if (unlink(source) < 0) {
		error("cannot unlink %s", source);
		return (1);
	}
	return (0);
}

/*VARARGS*/
query(prompt, a1, a2)
	char *a1;
{
	register char i, c;

	fprintf(stderr, prompt, a1, a2);
	i = c = getchar();
	while (c != '\n' && c != EOF)
		c = getchar();
	return (i == 'y');
}

char *
dname(name)
	register char *name;
{
	register char *p;

	p = name;
	while (*p)
		if (*p++ == DELIM && *p)
			name = p;
	return name;
}

/*VARARGS*/
error(fmt, a1, a2)
	char *fmt;
{

	fprintf(stderr, "mv: ");
	fprintf(stderr, fmt, a1, a2);
	fprintf(stderr, "\n");
}

Perror(s)
	char *s;
{
	char buf[MAXPATHLEN + 10];

	sprintf(buf, "mv: %s", s);
	perror(buf);
}

Perror2(s1, s2)
	char *s1, *s2;
{
	char buf[MAXPATHLEN + 20];

	sprintf(buf, "mv: %s: %s", s1, s2);
	perror(buf);
}