home *** CD-ROM | disk | FTP | other *** search
- /*-
- * 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);
- }
-