--- /dev/null
+.\" $NetBSD: rm.1,v 1.24 2006/09/02 23:28:32 wiz Exp $
+.\"
+.\" Copyright (c) 1990, 1993, 1994, 2003
+.\" The Regents of the University of California. All rights reserved.
+.\"
+.\" This code is derived from software contributed to Berkeley by
+.\" the Institute of Electrical and Electronics Engineers, Inc.
+.\"
+.\" 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.
+.\"
+.\" @(#)rm.1 8.5 (Berkeley) 12/5/94
+.\"
+.Dd August 25, 2006
+.Dt RM 1
+.Os
+.Sh NAME
+.Nm rm
+.Nd remove directory entries
+.Sh SYNOPSIS
+.Nm
+.Op Fl f | Fl i
+.Op Fl dPRrvW
+.Ar
+.Sh DESCRIPTION
+The
+.Nm
+utility attempts to remove the non-directory type files specified on the
+command line.
+If the permissions of the file do not permit writing, and the standard
+input device is a terminal, the user is prompted (on the standard error
+output) for confirmation.
+.Pp
+The options are as follows:
+.Bl -tag -width flag
+.It Fl d
+Attempt to remove directories as well as other types of files.
+.It Fl f
+Attempt to remove the files without prompting for confirmation,
+regardless of the file's permissions.
+If the file does not exist, do not display a diagnostic message or modify
+the exit status to reflect an error.
+The
+.Fl f
+option overrides any previous
+.Fl i
+options.
+.It Fl i
+Request confirmation before attempting to remove each file, regardless of
+the file's permissions, or whether or not the standard input device is a
+terminal.
+The
+.Fl i
+option overrides any previous
+.Fl f
+options.
+.It Fl P
+Overwrite regular files before deleting them.
+Files are overwritten three times, first with the byte pattern 0xff,
+then 0x00, and then with random data, before they are deleted.
+Some care is taken to ensure that the data are actually written to
+disk, but this cannot be guaranteed, even on traditional filesystems;
+on log-structured filesystems or if any block-journaling scheme is
+in use, this option is completely useless.
+If the file cannot be
+overwritten, it will not be removed.
+.It Fl R
+Attempt to remove the file hierarchy rooted in each file argument.
+The
+.Fl R
+option implies the
+.Fl d
+option.
+If the
+.Fl i
+option is specified, the user is prompted for confirmation before
+each directory's contents are processed (as well as before the attempt
+is made to remove the directory).
+If the user does not respond affirmatively, the file hierarchy rooted in
+that directory is skipped.
+.Pp
+.It Fl r
+Equivalent to
+.Fl R .
+.It Fl v
+Cause
+.Nm
+to be verbose, showing files as they are processed.
+.It Fl W
+Attempts to undelete the named files.
+Currently, this option can only be used to recover
+files covered by whiteouts.
+.El
+.Pp
+The
+.Nm
+utility removes symbolic links, not the files referenced by the links.
+.Pp
+It is an error to attempt to remove the files ``.'' and ``..''.
+.Sh EXIT STATUS
+The
+.Nm
+utility exits 0 if all of the named files or file hierarchies were removed,
+or if the
+.Fl f
+option was specified and all of the existing files or file hierarchies were
+removed.
+If an error occurs,
+.Nm
+exits with a value \*[Gt]0.
+.Sh EXAMPLES
+.Nm
+uses
+.Xr getopt 3
+standard argument processing.
+Removing filenames that begin with a dash
+.Pq e.g., Ar -file
+in the current directory which might otherwise be taken as option flags to
+.Nm
+can be accomplished as follows:
+.Pp
+.Ic "rm -- -file"
+.Pp
+or
+.Pp
+.Ic "rm ./-file"
+.Sh SEE ALSO
+.Xr rmdir 1 ,
+.Xr undelete 2 ,
+.Xr unlink 2 ,
+.Xr fts 3 ,
+.Xr getopt 3 ,
+.Xr symlink 7
+.Sh BUGS
+The
+.Fl P
+option assumes that the underlying file system is a fixed-block file
+system.
+FFS is a fixed-block file system, LFS is not.
+In addition, only regular files are overwritten, other types of files
+are not.
+Recent research indicates that as many as 35 overwrite passes with
+carefully chosen data patterns may be necessary to actually prevent
+recovery of data from a magnetic disk.
+Thus the
+.Fl P
+option is likely both insufficient for its design purpose and far
+too costly for default operation.
+However, it will at least prevent the recovery of data from FFS
+volumes with
+.Xr fsdb 8 .
+.Sh COMPATIBILITY
+The
+.Nm
+utility differs from historical implementations in that the
+.Fl f
+option only masks attempts to remove non-existent files instead of
+masking a large variety of errors.
+.Pp
+Also, historical
+.Bx
+implementations prompted on the standard output,
+not the standard error output.
+.Sh STANDARDS
+The
+.Nm
+utility is expected to be
+.St -p1003.2
+compatible.
+The
+.Fl v
+option is an extension.
+.Pp
+The
+.Fl P
+option attempts to conform to U.S. DoD 5220-22.M, "National Industrial
+Security Program Operating Manual" ("NISPOM") as updated by Change
+2 and the July 23, 2003 "Clearing \*[Am] Sanitization Matrix".
+However, unlike earlier revisions of NISPOM, the 2003 matrix imposes
+requirements which make it clear that the standard does not and
+can not apply to the erasure of individual files, in particular
+requirements relating to spare sector management for an entire
+magnetic disk.
+.Em Because these requirements are not met, the
+.Fl P
+.Em option does not conform to the standard .
--- /dev/null
+/* $NetBSD: rm.c,v 1.50 2011/08/29 14:48:46 joerg Exp $ */
+
+/*-
+ * Copyright (c) 1990, 1993, 1994, 2003
+ * 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. 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/cdefs.h>
+#ifndef lint
+__COPYRIGHT("@(#) Copyright (c) 1990, 1993, 1994\
+ The Regents of the University of California. All rights reserved.");
+#endif /* not lint */
+
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)rm.c 8.8 (Berkeley) 4/27/95";
+#else
+__RCSID("$NetBSD: rm.c,v 1.50 2011/08/29 14:48:46 joerg Exp $");
+#endif
+#endif /* not lint */
+
+#include <sys/param.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <fts.h>
+#include <grp.h>
+#include <locale.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+static int dflag, eval, fflag, iflag, Pflag, stdin_ok, vflag, Wflag;
+
+static int check(char *, char *, struct stat *);
+static void checkdot(char **);
+static void rm_file(char **);
+static int rm_overwrite(char *, struct stat *);
+static void rm_tree(char **);
+__dead static void usage(void);
+
+#ifdef __minix
+# ifndef O_SYNC
+# define O_SYNC 0
+# endif
+# ifndef O_RSYNC
+# define O_RSYNC 0
+# endif
+#endif
+
+/*
+ * For the sake of the `-f' flag, check whether an error number indicates the
+ * failure of an operation due to an non-existent file, either per se (ENOENT)
+ * or because its filename argument was illegal (ENAMETOOLONG, ENOTDIR).
+ */
+#define NONEXISTENT(x) \
+ ((x) == ENOENT || (x) == ENAMETOOLONG || (x) == ENOTDIR)
+
+/*
+ * 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(int argc, char *argv[])
+{
+ int ch, rflag;
+
+ setprogname(argv[0]);
+ (void)setlocale(LC_ALL, "");
+
+ Pflag = rflag = 0;
+ while ((ch = getopt(argc, argv, "dfiPRrvW")) != -1)
+ 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 'v':
+ vflag = 1;
+ break;
+ case 'W':
+ Wflag = 1;
+ break;
+ case '?':
+ default:
+ usage();
+ }
+ argc -= optind;
+ argv += optind;
+
+ if (argc < 1) {
+ if (fflag)
+ return 0;
+ usage();
+ }
+
+ checkdot(argv);
+
+ if (*argv) {
+ stdin_ok = isatty(STDIN_FILENO);
+
+ if (rflag)
+ rm_tree(argv);
+ else
+ rm_file(argv);
+ }
+
+ exit(eval);
+ /* NOTREACHED */
+}
+
+static void
+rm_tree(char **argv)
+{
+ FTS *fts;
+ FTSENT *p;
+ int flags, needstat, rval;
+
+ /*
+ * 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
+
+ flags = FTS_PHYSICAL;
+ if (!needstat)
+ flags |= FTS_NOSTAT;
+#ifndef __minix
+ if (Wflag)
+ flags |= FTS_WHITEOUT;
+#endif
+ if ((fts = fts_open(argv, flags, NULL)) == NULL)
+ err(1, "fts_open failed");
+ 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(EXIT_FAILURE, "%s: %s", p->fts_path,
+ strerror(p->fts_errno));
+ /* NOTREACHED */
+ case FTS_NS:
+ /*
+ * FTS_NS: assume that if can't stat the file, it
+ * can't be unlinked.
+ */
+ if (fflag && NONEXISTENT(p->fts_errno))
+ continue;
+ if (needstat) {
+ warnx("%s: %s", p->fts_path,
+ strerror(p->fts_errno));
+ eval = 1;
+ continue;
+ }
+ break;
+ case FTS_D:
+ /* Pre-order: give user chance to skip. */
+ if (!fflag && !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;
+ default:
+ if (!fflag &&
+ !check(p->fts_path, p->fts_accpath, p->fts_statp))
+ continue;
+ }
+
+ rval = 0;
+ /*
+ * 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.
+ */
+ switch (p->fts_info) {
+ case FTS_DP:
+ case FTS_DNR:
+ rval = rmdir(p->fts_accpath);
+ if (rval != 0 && fflag && errno == ENOENT)
+ continue;
+ break;
+
+#ifndef __minix
+ case FTS_W:
+ rval = undelete(p->fts_accpath);
+ if (rval != 0 && fflag && errno == ENOENT)
+ continue;
+ break;
+#endif
+
+ default:
+ if (Pflag) {
+ if (rm_overwrite(p->fts_accpath, NULL))
+ continue;
+ }
+ rval = unlink(p->fts_accpath);
+ if (rval != 0 && fflag && NONEXISTENT(errno))
+ continue;
+ break;
+ }
+ if (rval != 0) {
+ warn("%s", p->fts_path);
+ eval = 1;
+ } else if (vflag)
+ (void)printf("%s\n", p->fts_path);
+ }
+ if (errno)
+ err(1, "fts_read");
+ fts_close(fts);
+}
+
+static void
+rm_file(char **argv)
+{
+ struct stat sb;
+ int rval;
+ char *f;
+
+ /*
+ * 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 (Wflag) {
+#ifdef __minix
+ sb.st_mode = S_IWUSR|S_IRUSR;
+#else
+ sb.st_mode = S_IFWHT|S_IWUSR|S_IRUSR;
+#endif
+ } else {
+ if (!fflag || !NONEXISTENT(errno)) {
+ warn("%s", f);
+ eval = 1;
+ }
+ continue;
+ }
+ } else if (Wflag) {
+ warnx("%s: %s", f, strerror(EEXIST));
+ eval = 1;
+ continue;
+ }
+
+ if (S_ISDIR(sb.st_mode) && !dflag) {
+ warnx("%s: is a directory", f);
+ eval = 1;
+ continue;
+ }
+#ifndef __minix
+ if (!fflag && !S_ISWHT(sb.st_mode) && !check(f, f, &sb))
+#else
+ if (!fflag && !check(f, f, &sb))
+#endif
+ continue;
+#ifndef __minix
+ if (S_ISWHT(sb.st_mode))
+ rval = undelete(f);
+ else
+#endif
+ if (S_ISDIR(sb.st_mode))
+ rval = rmdir(f);
+ else {
+ if (Pflag) {
+ if (rm_overwrite(f, &sb))
+ continue;
+ }
+ rval = unlink(f);
+ }
+ if (rval && (!fflag || !NONEXISTENT(errno))) {
+ warn("%s", f);
+ eval = 1;
+ }
+ if (vflag && rval == 0)
+ (void)printf("%s\n", f);
+ }
+}
+
+/*
+ * rm_overwrite --
+ * Overwrite the file 3 times with varying bit patterns.
+ *
+ * This is an expensive way to keep people from recovering files from your
+ * non-snapshotted FFS filesystems using fsdb(8). Really. No more. 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.
+ *
+ * A note on standards: U.S. DoD 5220.22-M "National Industrial Security
+ * Program Operating Manual" ("NISPOM") is often cited as a reference
+ * for clearing and sanitizing magnetic media. In fact, a matrix of
+ * "clearing" and "sanitization" methods for various media was given in
+ * Chapter 8 of the original 1995 version of NISPOM. However, that
+ * matrix was *removed from the document* when Chapter 8 was rewritten
+ * in Change 2 to the document in 2001. Recently, the Defense Security
+ * Service has made a revised clearing and sanitization matrix available
+ * in Microsoft Word format on the DSS web site. The standardization
+ * status of this matrix is unclear. Furthermore, one must be very
+ * careful when referring to this matrix: it is intended for the "clearing"
+ * prior to reuse or "sanitization" prior to disposal of *entire media*,
+ * not individual files and the only non-physically-destructive method of
+ * "sanitization" that is permitted for magnetic disks of any kind is
+ * specifically noted to be prohibited for media that have contained
+ * Top Secret data.
+ *
+ * It is impossible to actually conform to the exact procedure given in
+ * the matrix if one is overwriting a file, not an entire disk, because
+ * the procedure requires examination and comparison of the disk's defect
+ * lists. Any program that claims to securely erase *files* while
+ * conforming to the standard, then, is not correct. We do as much of
+ * what the standard requires as can actually be done when erasing a
+ * file, rather than an entire disk; but that does not make us conformant.
+ *
+ * Furthermore, the presence of track caches, disk and controller write
+ * caches, and so forth make it extremely difficult to ensure that data
+ * have actually been written to the disk, particularly when one tries
+ * to repeatedly overwrite the same sectors in quick succession. We call
+ * fsync(), but controllers with nonvolatile cache, as well as IDE disks
+ * that just plain lie about the stable storage of data, will defeat this.
+ *
+ * Finally, widely respected research suggests that the given procedure
+ * is nowhere near sufficient to prevent the recovery of data using special
+ * forensic equipment and techniques that are well-known. This is
+ * presumably one reason that the matrix requires physical media destruction,
+ * rather than any technique of the sort attempted here, for secret data.
+ *
+ * Caveat Emptor.
+ *
+ * rm_overwrite will return 0 on success.
+ */
+
+static int
+rm_overwrite(char *file, struct stat *sbp)
+{
+ struct stat sb;
+ int fd, randint;
+ char randchar;
+
+ fd = -1;
+ if (sbp == NULL) {
+ if (lstat(file, &sb))
+ goto err;
+ sbp = &sb;
+ }
+ if (!S_ISREG(sbp->st_mode))
+ return 0;
+
+ /* flags to try to defeat hidden caching by forcing seeks */
+ if ((fd = open(file, O_RDWR|O_SYNC|O_RSYNC, 0)) == -1)
+ goto err;
+
+#define RAND_BYTES 1
+#define THIS_BYTE 0
+
+#define WRITE_PASS(mode, byte) do { \
+ off_t len; \
+ size_t wlen, i; \
+ char buf[8 * 1024]; \
+ \
+ if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET)) \
+ goto err; \
+ \
+ if (mode == THIS_BYTE) \
+ memset(buf, byte, sizeof(buf)); \
+ for (len = sbp->st_size; len > 0; len -= wlen) { \
+ if (mode == RAND_BYTES) { \
+ for (i = 0; i < sizeof(buf); \
+ i+= sizeof(u_int32_t)) \
+ *(int *)(buf + i) = arc4random(); \
+ } \
+ wlen = len < (off_t)sizeof(buf) ? (size_t)len : sizeof(buf); \
+ if ((size_t)write(fd, buf, wlen) != wlen) \
+ goto err; \
+ } \
+ sync(); /* another poke at hidden caches */ \
+} while (/* CONSTCOND */ 0)
+
+#define READ_PASS(byte) do { \
+ off_t len; \
+ size_t rlen; \
+ char pattern[8 * 1024]; \
+ char buf[8 * 1024]; \
+ \
+ if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET)) \
+ goto err; \
+ \
+ memset(pattern, byte, sizeof(pattern)); \
+ for(len = sbp->st_size; len > 0; len -= rlen) { \
+ rlen = len < (off_t)sizeof(buf) ? (size_t)len : sizeof(buf); \
+ if((size_t)read(fd, buf, rlen) != rlen) \
+ goto err; \
+ if(memcmp(buf, pattern, rlen)) \
+ goto err; \
+ } \
+ sync(); /* another poke at hidden caches */ \
+} while (/* CONSTCOND */ 0)
+
+ /*
+ * DSS sanitization matrix "clear" for magnetic disks:
+ * option 'c' "Overwrite all addressable locations with a single
+ * character."
+ */
+ randint = arc4random();
+ randchar = *(char *)&randint;
+ WRITE_PASS(THIS_BYTE, randchar);
+
+ /*
+ * DSS sanitization matrix "sanitize" for magnetic disks:
+ * option 'd', sub 2 "Overwrite all addressable locations with a
+ * character, then its complement. Verify "complement" character
+ * was written successfully to all addressable locations, then
+ * overwrite all addressable locations with random characters; or
+ * verify third overwrite of random characters." The rest of the
+ * text in d-sub-2 specifies requirements for overwriting spared
+ * sectors; we cannot conform to it when erasing only a file, thus
+ * we do not conform to the standard.
+ */
+
+ /* 1. "a character" */
+ WRITE_PASS(THIS_BYTE, 0xff);
+
+ /* 2. "its complement" */
+ WRITE_PASS(THIS_BYTE, 0x00);
+
+ /* 3. "Verify 'complement' character" */
+ READ_PASS(0x00);
+
+ /* 4. "overwrite all addressable locations with random characters" */
+
+ WRITE_PASS(RAND_BYTES, 0x00);
+
+ /*
+ * As the file might be huge, and we note that this revision of
+ * the matrix says "random characters", not "a random character"
+ * as the original did, we do not verify the random-character
+ * write; the "or" in the standard allows this.
+ */
+
+ if (close(fd) == -1) {
+ fd = -1;
+ goto err;
+ }
+
+ return 0;
+
+err: eval = 1;
+ warn("%s", file);
+ if (fd != -1)
+ close(fd);
+ return 1;
+}
+
+static int
+check(char *path, char *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) && (errno != ETXTBSY)))
+ return (1);
+ strmode(sp->st_mode, modep);
+ if (Pflag) {
+ warnx(
+ "%s: -P was specified but file could not"
+ " be overwritten", path);
+ return 0;
+ }
+ (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' || first == 'Y');
+}
+
+/*
+ * POSIX.2 requires that if "." or ".." are specified as the basename
+ * portion of an operand, a diagnostic message be written to standard
+ * error and nothing more be done with such operands.
+ *
+ * Since POSIX.2 defines basename as the final portion of a path after
+ * trailing slashes have been removed, we'll remove them here.
+ */
+#define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2])))
+static void
+checkdot(char **argv)
+{
+ char *p, **save, **t;
+ int complained;
+
+ complained = 0;
+ for (t = argv; *t;) {
+ /* strip trailing slashes */
+ p = strrchr(*t, '\0');
+ while (--p > *t && *p == '/')
+ *p = '\0';
+
+ /* extract basename */
+ 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)
+ continue;
+ t = save;
+ } else
+ ++t;
+ }
+}
+
+static void
+usage(void)
+{
+
+ (void)fprintf(stderr, "usage: %s [-f|-i] [-dPRrvW] file ...\n",
+ getprogname());
+ exit(1);
+ /* NOTREACHED */
+}