X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/blobdiff_plain/2a7e674d556087289ce015ebd1befb1b5eab1fd2..dfb144fcc76595bb53320c5019330998b9103033:/usr/src/bin/mv/mv.c

diff --git a/usr/src/bin/mv/mv.c b/usr/src/bin/mv/mv.c
index a5847ae689..1df3aafd48 100644
--- a/usr/src/bin/mv/mv.c
+++ b/usr/src/bin/mv/mv.c
@@ -1,354 +1,274 @@
-static	char *sccsid = "@(#)mv.c	4.6 (Berkeley) 82/10/23";
-
 /*
- * mv file1 file2
+ * Copyright (c) 1989, 1993, 1994
+ *	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%
  */
 
-#include <stdio.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <signal.h>
+#ifndef lint
+static char copyright[] =
+"@(#) Copyright (c) 1989, 1993, 1994\n\
+	The Regents of the University of California.  All rights reserved.\n";
+#endif /* not lint */
 
-#define	DOT	"."
-#define	DOTDOT	".."
-#define	DELIM	'/'
-#define SDELIM "/"
-#define	MAXN	300
-#define MODEBITS 07777
-#define ROOTINO 2
+#ifndef lint
+static char sccsid[] = "@(#)mv.c	8.2 (Berkeley) %G%";
+#endif /* not lint */
 
-char	*pname();
-char	*sprintf();
-char	*dname();
-struct	stat s1, s2;
-int	iflag = 0;	/* interactive flag. If this flag is set,
-			 * the user is queried before files are
-			 * destroyed by cp.
-			 */
-int	fflag = 0;	/* force flag. supercedes all restrictions */
+#include <sys/param.h>
+#include <sys/time.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
 
-main(argc, argv)
-register char *argv[];
-{
-	register i, r;
-	register char *arg;
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
 
-	/* get the flag(s) */
+#include "pathnames.h"
 
-	if (argc < 2)
-		goto usage;
-	while (argc>1 && *argv[1] == '-') {
-		argc--;
-		arg = *++argv;
+int fflg, iflg;
 
-		/*
-		 *  all files following a null option are considered file names
-		 */
-		if (*(arg+1) == '\0') break;
+int	copy __P((char *, char *));
+int	do_move __P((char *, char *));
+int	fastcopy __P((char *, char *, struct stat *));
+void	usage __P((void));
 
-		while (*++arg != '\0')
-			switch (*arg) {
+int
+main(argc, argv)
+	int argc;
+	char *argv[];
+{
+	register int baselen, len, rval;
+	register char *p, *endp;
+	struct stat sb;
+	int ch;
+	char path[MAXPATHLEN + 1];
 
-			/* interactive mode */
-			case 'i':
-				iflag++;
-				break;
+	while ((ch = getopt(argc, argv, "-if")) != EOF)
+		switch (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;
 
-			/* force moves */
-			case 'f':
-				fflag++;
-				break;
+	if (argc < 2)
+		usage();
 
-			/* don't live with bad options */
-			default:
-				goto usage;
-			}
-	}
-	if (argc < 3)
-		goto usage;
-	if (lstat(argv[1], &s1) < 0) {
-		fprintf(stderr, "mv: cannot access %s\n", argv[1]);
-		return(1);
+	/*
+	 * 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]));
 	}
-	if ((s1.st_mode & S_IFMT) == S_IFDIR) {
-		if (argc != 3)
-			goto usage;
-		return mvdir(argv[1], argv[2]);
+
+	/* It's a directory, move each file into it. */
+	(void)strcpy(path, argv[argc - 1]);
+	baselen = strlen(path);
+	endp = &path[baselen];
+	*endp++ = '/';
+	++baselen;
+	for (rval = 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);
+			rval = 1;
+		} else {
+			memmove(endp, p, len + 1);
+			if (do_move(*argv, path))
+				rval = 1;
+		}
 	}
-	setuid(getuid());
-	if (argc > 3)
-		if (stat(argv[argc-1], &s2) < 0 || (s2.st_mode & S_IFMT) != S_IFDIR)
-			goto usage;
-	r = 0;
-	for (i=1; i<argc-1; i++)
-		r |= move(argv[i], argv[argc-1]);
-	return(r);
-usage:
-	fprintf(stderr, "usage: mv [-if] f1 f2; or mv [-if] d1 d2; or mv [-if] f1 ... fn d1\n");
-	return(1);
+	exit(rval);
 }
 
-move(source, target)
-char *source, *target;
+int
+do_move(from, to)
+	char *from, *to;
 {
-	register c, i;
-	int	status;
-	char	buf[MAXN];
+	struct stat sb;
+	int ask, ch;
+	char modep[15];
 
-	if (lstat(source, &s1) < 0) {
-		fprintf(stderr, "mv: cannot access %s\n", source);
-		return(1);
-	}
-	if ((s1.st_mode & S_IFMT) == S_IFDIR) {
-		fprintf(stderr, "mv: directory rename only\n");
-		return(1);
-	}
-	if (stat(target, &s2) >= 0) {
-		if ((s2.st_mode & S_IFMT) == S_IFDIR) {
-			sprintf(buf, "%s/%s", target, dname(source));
-			target = buf;
+	/*
+	 * 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)) {
+			strmode(sb.st_mode, modep);
+			(void)fprintf(stderr, "override %s%s%s/%s for %s? ",
+			    modep + 1, modep[9] == ' ' ? "" : " ",
+			    user_from_uid(sb.st_uid, 0),
+			    group_from_gid(sb.st_gid, 0), to);
+			ask = 1;
 		}
-		if (lstat(target, &s2) >= 0) {
-			if ((s2.st_mode & S_IFMT) == S_IFDIR) {
-				fprintf(stderr, "mv: %s is a directory\n", target);
-				return(1);
-			} else if (iflag && !fflag) {
-				fprintf(stderr, "remove %s? ", target);
-				i = c = getchar();
-				while (c != '\n' && c != EOF)
-					c = getchar();
-				if (i != 'y')
-					return(1);
-			}
-			if (s1.st_dev==s2.st_dev && s1.st_ino==s2.st_ino) {
-				fprintf(stderr, "mv: %s and %s are identical\n",
-						source, target);
-				return(1);
-			}
-			if (access(target, 2) < 0 && !fflag && isatty(fileno(stdin))) {
-				fprintf(stderr, "override protection %o for %s? ", 
-					s2.st_mode & MODEBITS, target);
-				i = c = getchar();
-				while (c != '\n' && c != EOF)
-					c = getchar();
-				if (i != 'y')
-					return(1);
-			}
-			if (unlink(target) < 0) {
-				fprintf(stderr, "mv: cannot unlink %s\n", target);
-				return(1);
-			}
+		if (ask) {
+			if ((ch = getchar()) != EOF && ch != '\n')
+				while (getchar() != '\n');
+			if (ch != 'y')
+				return (0);
 		}
 	}
-	if ((s1.st_mode & S_IFMT) == S_IFLNK) {
-		register m;
-		char symln[MAXN];
+	if (!rename(from, to))
+		return (0);
 
-		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);
-		}
-		umask(m);
-	} else if (link(source, target) < 0) {
-		i = fork();
-		if (i == -1) {
-			fprintf(stderr, "mv: try again\n");
-			return(1);
-		}
-		if (i == 0) {
-			execl("/bin/cp", "cp", source, target, 0);
-			fprintf(stderr, "mv: cannot exec cp\n");
-			exit(1);
-		}
-		while ((c = wait(&status)) != i && c != -1)
-			;
-		if (status != 0)
-			return(1);
-		utime(target, &s1.st_atime);
+	if (errno != EXDEV) {
+		warn("rename %s to %s", from, to);
+		return (1);
 	}
-	if (unlink(source) < 0) {
-		fprintf(stderr, "mv: cannot unlink %s\n", source);
-		return(1);
+
+	/*
+	 * If rename fails because we're trying to cross devices, 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(0);
+	return (S_ISREG(sb.st_mode) ?
+	    fastcopy(from, to, &sb) : copy(from, to));
 }
 
-mvdir(source, target)
-char *source, *target;
+int
+fastcopy(from, to, sbp)
+	char *from, *to;
+	struct stat *sbp;
 {
-	register char *p;
-	register i;
-	char buf[MAXN];
-	char c,cc;
+	struct timeval tval[2];
+	static u_int blen;
+	static char *bp;
+	register int nread, from_fd, to_fd;
 
-	if (stat(target, &s2) >= 0) {
-		if ((s2.st_mode&S_IFMT) != S_IFDIR) {
-			fprintf(stderr, "mv: %s exists\n", target);
-			return(1);
-		}
-		p = dname(source);
-		if (strlen(target) > MAXN-strlen(p)-2) {
-			fprintf(stderr, "mv :target name too long\n");
-			return(1);
-		}
-		strcpy(buf, target);
-		target = buf;
-		strcat(buf, SDELIM);
-		strcat(buf, p);
-		if (stat(target, &s2) >= 0) {
-			fprintf(stderr, "mv: %s exists\n", buf);
-			return(1);
-		}
-	}
-	if (strcmp(source, target) == 0) {
-		fprintf(stderr, "mv: ?? source == target, source exists and target doesnt\n");
-		return(1);
-	}
-	p = dname(source);
-	if (!strcmp(p, DOT) || !strcmp(p, DOTDOT) || !strcmp(p, "") || p[strlen(p)-1]=='/') {
-		fprintf(stderr, "mv: cannot rename %s\n", p);
-		return(1);
+	if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
+		warn("%s", from);
+		return (1);
 	}
-	if (stat(pname(source), &s1) < 0 || stat(pname(target), &s2) < 0) {
-		fprintf(stderr, "mv: cannot locate parent\n");
-		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 (access(pname(target), 2) < 0) {
-		fprintf(stderr, "mv: no write access to %s\n", pname(target));
-		return(1);
+	if (!blen && !(bp = malloc(blen = sbp->st_blksize))) {
+		warn(NULL);
+		return (1);
 	}
-	if (access(pname(source), 2) < 0) {
-		fprintf(stderr, "mv: no write access to %s\n", pname(source));
-		return(1);
-	}
-	if (s1.st_dev != s2.st_dev) {
-		fprintf(stderr, "mv: cannot move directories across devices\n");
-		return(1);
-	}
-	if (s1.st_ino != s2.st_ino) {
-		char dst[MAXN+5];
-
-		if (chkdot(source) || chkdot(target)) {
-			fprintf(stderr, "mv: Sorry, path names including %s aren't allowed\n", DOTDOT);
-			return(1);
-		}
-		stat(source, &s1);
-		if (check(pname(target), s1.st_ino))
-			return(1);
-		for (i = 1; i <= NSIG; i++)
-			signal(i, SIG_IGN);
-		if (link(source, target) < 0) {
-			fprintf(stderr, "mv: cannot link %s to %s\n", target, source);
-			return(1);
-		}
-		if (unlink(source) < 0) {
-			fprintf(stderr, "mv: %s: cannot unlink\n", source);
-			unlink(target);
-			return(1);
-		}
-		strcat(dst, target);
-		strcat(dst, "/");
-		strcat(dst, DOTDOT);
-		if (unlink(dst) < 0) {
-			fprintf(stderr, "mv: %s: cannot unlink\n", dst);
-			if (link(target, source) >= 0)
-				unlink(target);
-			return(1);
-		}
-		if (link(pname(target), dst) < 0) {
-			fprintf(stderr, "mv: cannot link %s to %s\n",
-				dst, pname(target));
-			if (link(pname(source), dst) >= 0)
-				if (link(target, source) >= 0)
-					unlink(target);
-			return(1);
+	while ((nread = read(from_fd, bp, blen)) > 0)
+		if (write(to_fd, bp, nread) != nread) {
+			warn("%s", to);
+			goto err;
 		}
-		return(0);
+	if (nread < 0) {
+		warn("%s", from);
+err:		if (unlink(to))
+			warn("%s: remove", to);
+		(void)close(from_fd);
+		(void)close(to_fd);
+		return (1);
 	}
-	if (link(source, target) < 0) {
-		fprintf(stderr, "mv: cannot link %s and %s\n",
-			source, target);
-		return(1);
-	}
-	if (unlink(source) < 0) {
-		fprintf(stderr, "mv: ?? cannot unlink %s\n", source);
-		return(1);
-	}
-	return(0);
-}
+	(void)close(from_fd);
 
-char *
-pname(name)
-register char *name;
-{
-	register c;
-	register char *p, *q;
-	static	char buf[MAXN];
+	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);
 
-	p = q = buf;
-	while (c = *p++ = *name++)
-		if (c == DELIM)
-			q = p-1;
-	if (q == buf && *q == DELIM)
-		q++;
-	*q = 0;
-	return buf[0]? buf : DOT;
-}
+	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);
 
-char *
-dname(name)
-register char *name;
-{
-	register char *p;
+	if (close(to_fd)) {
+		warn("%s", to);
+		return (1);
+	}
 
-	p = name;
-	while (*p)
-		if (*p++ == DELIM && *p)
-			name = p;
-	return name;
+	if (unlink(from)) {
+		warn("%s: remove", from);
+		return (1);
+	}
+	return (0);
 }
 
-check(spth, dinode)
-char *spth;
-ino_t dinode;
+int
+copy(from, to)
+	char *from, *to;
 {
-	char nspth[MAXN];
-	struct stat sbuf;
+	int pid, status;
 
-	sbuf.st_ino = 0;
-
-	strcpy(nspth, spth);
-	while (sbuf.st_ino != ROOTINO) {
-		if (stat(nspth, &sbuf) < 0) {
-			fprintf(stderr, "mv: cannot access %s\n", nspth);
-			return(1);
-		}
-		if (sbuf.st_ino == dinode) {
-			fprintf(stderr, "mv: cannot move a directory into itself\n");
-			return(1);
-		}
-		if (strlen(nspth) > MAXN-2-sizeof(DOTDOT)) {
-			fprintf(stderr, "mv: name too long\n");
-			return(1);
-		}
-		strcat(nspth, SDELIM);
-		strcat(nspth, DOTDOT);
+	if ((pid = vfork()) == 0) {
+		execl(_PATH_CP, "mv", "-PRp", 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);
+	return (0);
 }
 
-chkdot(s)
-register char *s;
+void
+usage()
 {
-	do {
-		if (strcmp(dname(s), DOTDOT) == 0)
-			return(1);
-		s = pname(s);
-	} while (strcmp(s, DOT) != 0 && strcmp(s, SDELIM) != 0);
-	return(0);
+	(void)fprintf(stderr,
+"usage: mv [-if] src target;\n   or: mv [-if] src1 ... srcN directory\n");
+	exit(1);
 }