1 files changed, 378 insertions, 0 deletions

diff --git a/bin/rm/rm.c b/bin/rm/rm.c
new file mode 100644
index 000000000000..4cdf055d4bae
--- /dev/null
+++ b/bin/rm/rm.c
@@ -0,0 +1,378 @@
+/*-
+ * Copyright (c) 1990, 1993, 1994
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * 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 copyright[] =
+"@(#) Copyright (c) 1990, 1993, 1994\n\
+	The Regents of the University of California.  All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static char sccsid[] = "@(#)rm.c	8.5 (Berkeley) 4/18/94";
+#endif /* not lint */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <fts.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+int dflag, eval, fflag, iflag, Pflag, stdin_ok;
+
+int	check __P((char *, char *, struct stat *));
+void	checkdot __P((char **));
+void	rm_file __P((char **));
+void	rm_overwrite __P((char *, struct stat *));
+void	rm_tree __P((char **));
+void	usage __P((void));
+
+/*
+ * rm --
+ *	This rm is different from historic rm's, but is expected to match
+ *	POSIX 1003.2 behavior.  The most visible difference is that -f
+ *	has two specific effects now, ignore non-existent files and force
+ * 	file removal.
+ */
+int
+main(argc, argv)
+	int argc;
+	char *argv[];
+{
+	int ch, rflag;
+
+	Pflag = rflag = 0;
+	while ((ch = getopt(argc, argv, "dfiPRr")) != EOF)
+		switch(ch) {
+		case 'd':
+			dflag = 1;
+			break;
+		case 'f':
+			fflag = 1;
+			iflag = 0;
+			break;
+		case 'i':
+			fflag = 0;
+			iflag = 1;
+			break;
+		case 'P':
+			Pflag = 1;
+			break;
+		case 'R':
+		case 'r':			/* Compatibility. */
+			rflag = 1;
+			break;
+		case '?':
+		default:
+			usage();
+		}
+	argc -= optind;
+	argv += optind;
+
+	if (argc < 1)
+		usage();
+
+	checkdot(argv);
+	if (!*argv)
+		exit (eval);
+
+	stdin_ok = isatty(STDIN_FILENO);
+
+	if (rflag)
+		rm_tree(argv);
+	else
+		rm_file(argv);
+	exit (eval);
+}
+
+void
+rm_tree(argv)
+	char **argv;
+{
+	FTS *fts;
+	FTSENT *p;
+	int needstat;
+
+	/*
+	 * Remove a file hierarchy.  If forcing removal (-f), or interactive
+	 * (-i) or can't ask anyway (stdin_ok), don't stat the file.
+	 */
+	needstat = !fflag && !iflag && stdin_ok;
+
+	/*
+	 * If the -i option is specified, the user can skip on the pre-order
+	 * visit.  The fts_number field flags skipped directories.
+	 */
+#define	SKIPPED	1
+
+	if (!(fts = fts_open(argv,
+	    needstat ? FTS_PHYSICAL : FTS_PHYSICAL|FTS_NOSTAT,
+	    (int (*)())NULL)))
+		err(1, NULL);
+	while ((p = fts_read(fts)) != NULL) {
+		switch (p->fts_info) {
+		case FTS_DNR:
+			if (!fflag || p->fts_errno != ENOENT) {
+				warnx("%s: %s",
+				    p->fts_path, strerror(p->fts_errno));
+				eval = 1;
+			}
+			continue;
+		case FTS_ERR:
+			errx(1, "%s: %s", p->fts_path, strerror(p->fts_errno));
+		case FTS_NS:
+			/*
+			 * FTS_NS: assume that if can't stat the file, it
+			 * can't be unlinked.
+			 */
+			if (!needstat)
+				break;
+			if (!fflag || p->fts_errno != ENOENT) {
+				warnx("%s: %s",
+				    p->fts_path, strerror(p->fts_errno));
+				eval = 1;
+			}
+			continue;
+		case FTS_D:
+			/* Pre-order: give user chance to skip. */
+			if (iflag && !check(p->fts_path, p->fts_accpath,
+			    p->fts_statp)) {
+				(void)fts_set(fts, p, FTS_SKIP);
+				p->fts_number = SKIPPED;
+			}
+			continue;
+		case FTS_DP:
+			/* Post-order: see if user skipped. */
+			if (p->fts_number == SKIPPED)
+				continue;
+			break;
+		}
+		if (!fflag &&
+		    !check(p->fts_path, p->fts_accpath, p->fts_statp))
+			continue;
+
+		/*
+		 * If we can't read or search the directory, may still be
+		 * able to remove it.  Don't print out the un{read,search}able
+		 * message unless the remove fails.
+		 */
+		if (p->fts_info == FTS_DP || p->fts_info == FTS_DNR) {
+			if (!rmdir(p->fts_accpath))
+				continue;
+			if (errno == ENOENT) {
+				if (fflag)
+					continue;
+			} else if (p->fts_info != FTS_DP)
+				warnx("%s: unable to read", p->fts_path);
+		} else {
+			if (Pflag)
+				rm_overwrite(p->fts_accpath, NULL);
+			if (!unlink(p->fts_accpath) || fflag && errno == ENOENT)
+				continue;
+		}
+		warn("%s", p->fts_path);
+		eval = 1;
+	}
+	if (errno)
+		err(1, "fts_read");
+}
+
+void
+rm_file(argv)
+	char **argv;
+{
+	struct stat sb;
+	int df, rval;
+	char *f;
+
+	df = dflag;
+	/*
+	 * Remove a file.  POSIX 1003.2 states that, by default, attempting
+	 * to remove a directory is an error, so must always stat the file.
+	 */
+	while ((f = *argv++) != NULL) {
+		/* Assume if can't stat the file, can't unlink it. */
+		if (lstat(f, &sb)) {
+			if (!fflag || errno != ENOENT) {
+				warn("%s", f);
+				eval = 1;
+			}
+			continue;
+		}
+		if (S_ISDIR(sb.st_mode) && !df) {
+			warnx("%s: is a directory", f);
+			eval = 1;
+			continue;
+		}
+		if (!fflag && !check(f, f, &sb))
+			continue;
+		if (S_ISDIR(sb.st_mode))
+			rval = rmdir(f);
+		else {
+			if (Pflag)
+				rm_overwrite(f, &sb);
+			rval = unlink(f);
+		}
+		if (rval && (!fflag || errno != ENOENT)) {
+			warn("%s", f);
+			eval = 1;
+		}
+	}
+}
+
+/*
+ * rm_overwrite --
+ *	Overwrite the file 3 times with varying bit patterns.
+ *
+ * XXX
+ * This is a cheap way to *really* delete files.  Note that only regular
+ * files are deleted, directories (and therefore names) will remain.
+ * Also, this assumes a fixed-block file system (like FFS, or a V7 or a
+ * System V file system).  In a logging file system, you'll have to have
+ * kernel support.
+ */
+void
+rm_overwrite(file, sbp)
+	char *file;
+	struct stat *sbp;
+{
+	struct stat sb;
+	off_t len;
+	int fd, wlen;
+	char buf[8 * 1024];
+
+	fd = -1;
+	if (sbp == NULL) {
+		if (lstat(file, &sb))
+			goto err;
+		sbp = &sb;
+	}
+	if (!S_ISREG(sbp->st_mode))
+		return;
+	if ((fd = open(file, O_WRONLY, 0)) == -1)
+		goto err;
+
+#define	PASS(byte) {							\
+	memset(buf, byte, sizeof(buf));					\
+	for (len = sbp->st_size; len > 0; len -= wlen) {		\
+		wlen = len < sizeof(buf) ? len : sizeof(buf);		\
+		if (write(fd, buf, wlen) != wlen)			\
+			goto err;					\
+	}								\
+}
+	PASS(0xff);
+	if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
+		goto err;
+	PASS(0x00);
+	if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))
+		goto err;
+	PASS(0xff);
+	if (!fsync(fd) && !close(fd))
+		return;
+
+err:	eval = 1;
+	warn("%s", file);
+}
+
+
+int
+check(path, name, sp)
+	char *path, *name;
+	struct stat *sp;
+{
+	int ch, first;
+	char modep[15];
+
+	/* Check -i first. */
+	if (iflag)
+		(void)fprintf(stderr, "remove %s? ", path);
+	else {
+		/*
+		 * If it's not a symbolic link and it's unwritable and we're
+		 * talking to a terminal, ask.  Symbolic links are excluded
+		 * because their permissions are meaningless.  Check stdin_ok
+		 * first because we may not have stat'ed the file.
+		 */
+		if (!stdin_ok || S_ISLNK(sp->st_mode) || !access(name, W_OK))
+			return (1);
+		strmode(sp->st_mode, modep);
+		(void)fprintf(stderr, "override %s%s%s/%s for %s? ",
+		    modep + 1, modep[9] == ' ' ? "" : " ",
+		    user_from_uid(sp->st_uid, 0),
+		    group_from_gid(sp->st_gid, 0), path);
+	}
+	(void)fflush(stderr);
+
+	first = ch = getchar();
+	while (ch != '\n' && ch != EOF)
+		ch = getchar();
+	return (first == 'y');
+}
+
+#define ISDOT(a)	((a)[0] == '.' && (!(a)[1] || (a)[1] == '.' && !(a)[2]))
+void
+checkdot(argv)
+	char **argv;
+{
+	char *p, **save, **t;
+	int complained;
+
+	complained = 0;
+	for (t = argv; *t;) {
+		if ((p = strrchr(*t, '/')) != NULL)
+			++p;
+		else
+			p = *t;
+		if (ISDOT(p)) {
+			if (!complained++)
+				warnx("\".\" and \"..\" may not be removed");
+			eval = 1;
+			for (save = t; (t[0] = t[1]) != NULL; ++t);
+			t = save;
+		} else
+			++t;
+	}
+}
+
+void
+usage()
+{
+
+	(void)fprintf(stderr, "usage: rm [-dfiRr] file ...\n");
+	exit(1);
+}