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-rw-r--r--bin/rm/rm.c294
1 files changed, 294 insertions, 0 deletions
diff --git a/bin/rm/rm.c b/bin/rm/rm.c
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+++ b/bin/rm/rm.c
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+/*-
+ * Copyright (c) 1990 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
+char copyright[] =
+"@(#) Copyright (c) 1990 The Regents of the University of California.\n\
+ All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static char sccsid[] = "@(#)rm.c 4.27 (Berkeley) 1/27/92";
+#endif /* not lint */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/errno.h>
+#include <fts.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+int dflag, fflag, iflag, retval, stdin_ok;
+
+/*
+ * 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.
+ */
+
+main(argc, argv)
+ int argc;
+ char **argv;
+{
+ extern char *optarg;
+ extern int optind;
+ int ch, rflag;
+
+ rflag = 0;
+ while ((ch = getopt(argc, argv, "dfiRr")) != EOF)
+ switch(ch) {
+ case 'd':
+ dflag = 1;
+ break;
+ case 'f':
+ fflag = 1;
+ iflag = 0;
+ break;
+ case 'i':
+ fflag = 0;
+ iflag = 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(retval);
+
+ stdin_ok = isatty(STDIN_FILENO);
+
+ if (rflag)
+ rmtree(argv);
+ else
+ rmfile(argv);
+ exit(retval);
+}
+
+rmtree(argv)
+ char **argv;
+{
+ register FTS *fts;
+ register FTSENT *p;
+ register int needstat;
+ struct stat sb;
+
+ /*
+ * 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))) {
+ (void)fprintf(stderr, "rm: %s.\n", strerror(errno));
+ exit(1);
+ }
+ while (p = fts_read(fts)) {
+ switch(p->fts_info) {
+ case FTS_DNR:
+ case FTS_ERR:
+ error(p->fts_path, errno);
+ exit(1);
+ /*
+ * FTS_NS: assume that if can't stat the file, it can't be
+ * unlinked.
+ */
+ case FTS_NS:
+ if (!needstat)
+ break;
+ if (!fflag || errno != ENOENT)
+ error(p->fts_path, errno);
+ continue;
+ /* Pre-order: give user chance to skip. */
+ case FTS_D:
+ if (iflag && !check(p->fts_path, p->fts_accpath,
+ p->fts_statp)) {
+ (void)fts_set(fts, p, FTS_SKIP);
+ p->fts_number = SKIPPED;
+ }
+ continue;
+ /* Post-order: see if user skipped. */
+ case FTS_DP:
+ 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)
+ (void)fprintf(stderr,
+ "rm: unable to read %s.\n", p->fts_path);
+ } else if (!unlink(p->fts_accpath) || fflag && errno == ENOENT)
+ continue;
+ error(p->fts_path, errno);
+ }
+}
+
+rmfile(argv)
+ char **argv;
+{
+ register int df;
+ register char *f;
+ struct stat sb;
+
+ 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++) {
+ /* Assume if can't stat the file, can't unlink it. */
+ if (lstat(f, &sb)) {
+ if (!fflag || errno != ENOENT)
+ error(f, errno);
+ continue;
+ }
+ if (S_ISDIR(sb.st_mode) && !df) {
+ (void)fprintf(stderr, "rm: %s: is a directory\n", f);
+ retval = 1;
+ continue;
+ }
+ if (!fflag && !check(f, f, &sb))
+ continue;
+ if ((S_ISDIR(sb.st_mode) ? rmdir(f) : unlink(f)) &&
+ (!fflag || errno != ENOENT))
+ error(f, errno);
+ }
+}
+
+check(path, name, sp)
+ char *path, *name;
+ struct stat *sp;
+{
+ register int first, ch;
+ char modep[15], *user_from_uid(), *group_from_gid();
+
+ /* 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.
+ */
+ if (S_ISLNK(sp->st_mode) || !stdin_ok || !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]))
+checkdot(argv)
+ char **argv;
+{
+ register char *p, **t, **save;
+ int complained;
+
+ complained = 0;
+ for (t = argv; *t;) {
+ if (p = rindex(*t, '/'))
+ ++p;
+ else
+ p = *t;
+ if (ISDOT(p)) {
+ if (!complained++)
+ (void)fprintf(stderr,
+ "rm: \".\" and \"..\" may not be removed.\n");
+ retval = 1;
+ for (save = t; t[0] = t[1]; ++t);
+ t = save;
+ } else
+ ++t;
+ }
+}
+
+error(name, val)
+ char *name;
+ int val;
+{
+ (void)fprintf(stderr, "rm: %s: %s.\n", name, strerror(val));
+ retval = 1;
+}
+
+usage()
+{
+ (void)fprintf(stderr, "usage: rm [-dfiRr] file ...\n");
+ exit(1);
+}
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