296 lines
7.2 KiB
C
296 lines
7.2 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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char copyright[] =
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"@(#) Copyright (c) 1990 The Regents of the University of California.\n\
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All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)rm.c 4.26 (Berkeley) 3/10/91";
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static char rcsid[] = "$Header: /cvsroot/src/bin/rm/rm.c,v 1.3 1993/03/23 00:27:09 cgd Exp $";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/errno.h>
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#include <fts.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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int dflag, fflag, iflag, retval, stdin_ok;
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/*
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* rm --
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* This rm is different from historic rm's, but is expected to match
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* POSIX 1003.2 behavior. The most visible difference is that -f
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* has two specific effects now, ignore non-existent files and force
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* file removal.
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*/
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main(argc, argv)
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int argc;
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char **argv;
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{
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extern char *optarg;
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extern int optind;
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int ch, rflag;
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rflag = 0;
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while ((ch = getopt(argc, argv, "dfiRr")) != EOF)
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switch(ch) {
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case 'd':
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dflag = 1;
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break;
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case 'f':
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fflag = 1;
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iflag = 0;
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break;
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case 'i':
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fflag = 0;
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iflag = 1;
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break;
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case 'R':
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case 'r': /* compatibility */
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rflag = 1;
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break;
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (argc < 1)
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usage();
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checkdot(argv);
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if (!*argv)
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exit(retval);
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stdin_ok = isatty(STDIN_FILENO);
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if (rflag)
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rmtree(argv);
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else
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rmfile(argv);
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exit(retval);
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}
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rmtree(argv)
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char **argv;
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{
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register FTS *fts;
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register FTSENT *p;
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register int needstat;
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struct stat sb;
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/*
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* Remove a file hierarchy. If forcing removal (-f), or interactive
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* (-i) or can't ask anyway (stdin_ok), don't stat the file.
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*/
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needstat = !fflag && !iflag && stdin_ok;
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/*
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* If the -i option is specified, the user can skip on the pre-order
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* visit. The fts_number field flags skipped directories.
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*/
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#define SKIPPED 1
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if (!(fts = fts_open(argv,
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needstat ? FTS_PHYSICAL : FTS_PHYSICAL|FTS_NOSTAT,
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(int (*)())NULL))) {
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(void)fprintf(stderr, "rm: %s.\n", strerror(errno));
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exit(1);
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}
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while (p = fts_read(fts)) {
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switch(p->fts_info) {
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case FTS_DNR:
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case FTS_ERR:
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error(p->fts_path, errno);
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exit(1);
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/*
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* FTS_NS: assume that if can't stat the file, it can't be
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* unlinked.
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*/
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case FTS_NS:
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if (!needstat)
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break;
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if (!fflag || errno != ENOENT)
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error(p->fts_path, errno);
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continue;
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/* Pre-order: give user chance to skip. */
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case FTS_D:
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if (iflag && !check(p->fts_path, p->fts_accpath,
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&p->fts_statb)) {
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(void)fts_set(fts, p, FTS_SKIP);
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p->fts_number = SKIPPED;
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}
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continue;
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/* Post-order: see if user skipped. */
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case FTS_DP:
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if (p->fts_number == SKIPPED)
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continue;
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break;
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}
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if (!fflag &&
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!check(p->fts_path, p->fts_accpath, &p->fts_statb))
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continue;
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/*
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* If we can't read or search the directory, may still be
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* able to remove it. Don't print out the un{read,search}able
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* message unless the remove fails.
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*/
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if (p->fts_info == FTS_DP || p->fts_info == FTS_DNR) {
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if (!rmdir(p->fts_accpath))
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continue;
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if (errno == ENOENT) {
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if (fflag)
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continue;
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} else if (p->fts_info != FTS_DP)
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(void)fprintf(stderr,
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"rm: unable to read %s.\n", p->fts_path);
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} else if (!unlink(p->fts_accpath) || fflag && errno == ENOENT)
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continue;
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error(p->fts_path, errno);
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}
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}
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rmfile(argv)
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char **argv;
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{
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register int df;
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register char *f;
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struct stat sb;
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df = dflag;
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/*
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* Remove a file. POSIX 1003.2 states that, by default, attempting
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* to remove a directory is an error, so must always stat the file.
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*/
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while (f = *argv++) {
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/* Assume if can't stat the file, can't unlink it. */
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if (lstat(f, &sb)) {
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if (!fflag || errno != ENOENT)
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error(f, errno);
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continue;
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}
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if (S_ISDIR(sb.st_mode) && !df) {
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(void)fprintf(stderr, "rm: %s: is a directory\n", f);
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retval = 1;
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continue;
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}
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if (!fflag && !check(f, f, &sb))
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continue;
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if ((S_ISDIR(sb.st_mode) ? rmdir(f) : unlink(f)) &&
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(!fflag || errno != ENOENT))
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error(f, errno);
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}
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}
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check(path, name, sp)
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char *path, *name;
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struct stat *sp;
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{
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register int first, ch;
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char modep[15], *user_from_uid(), *group_from_gid();
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/* Check -i first. */
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if (iflag)
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(void)fprintf(stderr, "remove %s? ", path);
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else {
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/*
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* If it's not a symbolic link and it's unwritable and we're
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* talking to a terminal, ask. Symbolic links are excluded
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* because their permissions are meaningless.
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*/
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if (S_ISLNK(sp->st_mode) || !stdin_ok || !access(name, W_OK))
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return(1);
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strmode(sp->st_mode, modep);
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(void)fprintf(stderr, "override %s%s%s/%s for %s? ",
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modep + 1, modep[9] == ' ' ? "" : " ",
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user_from_uid(sp->st_uid, 0),
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group_from_gid(sp->st_gid, 0), path);
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}
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(void)fflush(stderr);
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first = ch = getchar();
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while (ch != '\n' && ch != EOF)
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ch = getchar();
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return(first == 'y');
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}
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#define ISDOT(a) ((a)[0] == '.' && (!(a)[1] || (a)[1] == '.' && !(a)[2]))
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checkdot(argv)
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char **argv;
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{
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register char *p, **t, **save;
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int complained;
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complained = 0;
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for (t = argv; *t;) {
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if (p = rindex(*t, '/'))
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++p;
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else
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p = *t;
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if (ISDOT(p)) {
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if (!complained++)
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(void)fprintf(stderr,
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"rm: \".\" and \"..\" may not be removed.\n");
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retval = 1;
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for (save = t; t[0] = t[1]; ++t);
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t = save;
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} else
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++t;
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}
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}
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error(name, val)
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char *name;
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int val;
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{
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(void)fprintf(stderr, "rm: %s: %s.\n", name, strerror(val));
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retval = 1;
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}
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usage()
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{
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(void)fprintf(stderr, "usage: rm [-dfiRr] file ...\n");
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exit(1);
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}
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