[unix-history] / usr / src / bin / rm / rm.c

/*-
 * 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	4.26 (Berkeley) 3/10/91";
#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_statb)) {
				(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_statb))
			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);
}
Commit	Line	Data
7f9ef9cc KB	1	/*-
	2	* Copyright (c) 1990 The Regents of the University of California.
	3	* All rights reserved.
	4	*
af359dea C	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
d1e4967d	32	*/
ae80f4a2	33
7f9ef9cc KB	34	#ifndef lint
	35	char copyright[] =
	36	"@(#) Copyright (c) 1990 The Regents of the University of California.\n\
	37	All rights reserved.\n";
	38	#endif /* not lint */
d1e4967d	39
7f9ef9cc	40	#ifndef lint
af359dea	41	static char sccsid[] = "@(#)rm.c 4.26 (Berkeley) 3/10/91";
7f9ef9cc	42	#endif /* not lint */
d1e4967d	43
7f9ef9cc KB	44	#include <sys/types.h>
	45	#include <sys/stat.h>
	46	#include <sys/errno.h>
	47	#include <fts.h>
	48	#include <unistd.h>
	49	#include <stdio.h>
	50	#include <string.h>
	51	#include <stdlib.h>
ae80f4a2	52
7f9ef9cc KB	53	int dflag, fflag, iflag, retval, stdin_ok;
	54
	55	/*
	56	* rm --
	57	* This rm is different from historic rm's, but is expected to match
	58	* POSIX 1003.2 behavior. The most visible difference is that -f
	59	* has two specific effects now, ignore non-existent files and force
	60	* file removal.
	61	*/
ae80f4a2 BJ	62
ae80f4a2 BJ	63	main(argc, argv)
8161a03a KB	64	int argc;
8161a03a KB	65	char **argv;
ae80f4a2	66	{
7f9ef9cc	67	extern char *optarg;
8161a03a	68	extern int optind;
7f9ef9cc	69	int ch, rflag;
ae80f4a2	70
7f9ef9cc KB	71	rflag = 0;
	72	while ((ch = getopt(argc, argv, "dfiRr")) != EOF)
	73	switch(ch) {
	74	case 'd':
	75	dflag = 1;
	76	break;
8161a03a	77	case 'f':
7f9ef9cc KB	78	fflag = 1;
7f9ef9cc KB	79	iflag = 0;
d1e4967d	80	break;
8161a03a	81	case 'i':
7f9ef9cc KB	82	fflag = 0;
7f9ef9cc KB	83	iflag = 1;
8161a03a KB	84	break;
8161a03a KB	85	case 'R':
307d7749	86	case 'r': /* compatibility */
7f9ef9cc	87	rflag = 1;
8161a03a KB	88	break;
	89	case '?':
	90	default:
	91	usage();
	92	}
7f9ef9cc KB	93	argc -= optind;
7f9ef9cc KB	94	argv += optind;
ca02483b	95
7f9ef9cc	96	if (argc < 1)
8161a03a	97	usage();
ae80f4a2	98
7f9ef9cc KB	99	checkdot(argv);
	100	if (!*argv)
	101	exit(retval);
d1e4967d	102
7f9ef9cc KB	103	stdin_ok = isatty(STDIN_FILENO);
	104
	105	if (rflag)
	106	rmtree(argv);
60b32b72	107	else
7f9ef9cc KB	108	rmfile(argv);
	109	exit(retval);
	110	}
	111
	112	rmtree(argv)
	113	char **argv;
	114	{
	115	register FTS *fts;
	116	register FTSENT *p;
	117	register int needstat;
	118	struct stat sb;
	119
	120	/*
	121	* Remove a file hierarchy. If forcing removal (-f), or interactive
	122	* (-i) or can't ask anyway (stdin_ok), don't stat the file.
	123	*/
	124	needstat = !fflag && !iflag && stdin_ok;
	125
	126	/*
	127	* If the -i option is specified, the user can skip on the pre-order
	128	* visit. The fts_number field flags skipped directories.
	129	*/
	130	#define SKIPPED 1
	131
	132	if (!(fts = fts_open(argv,
	133	needstat ? FTS_PHYSICAL : FTS_PHYSICAL\|FTS_NOSTAT,
	134	(int (*)())NULL))) {
	135	(void)fprintf(stderr, "rm: %s.\n", strerror(errno));
	136	exit(1);
ae80f4a2	137	}
7f9ef9cc KB	138	while (p = fts_read(fts)) {
7f9ef9cc KB	139	switch(p->fts_info) {
7f9ef9cc	140	case FTS_DNR:
7f9ef9cc KB	141	case FTS_ERR:
	142	error(p->fts_path, errno);
	143	exit(1);
	144	/*
	145	* FTS_NS: assume that if can't stat the file, it can't be
307d7749	146	* unlinked.
7f9ef9cc KB	147	*/
	148	case FTS_NS:
	149	if (!needstat)
d1e4967d	150	break;
7f9ef9cc KB	151	if (!fflag \|\| errno != ENOENT)
	152	error(p->fts_path, errno);
	153	continue;
	154	/* Pre-order: give user chance to skip. */
	155	case FTS_D:
	156	if (iflag && !check(p->fts_path, p->fts_accpath,
	157	&p->fts_statb)) {
	158	(void)fts_set(fts, p, FTS_SKIP);
	159	p->fts_number = SKIPPED;
d1e4967d	160	}
7f9ef9cc KB	161	continue;
	162	/* Post-order: see if user skipped. */
	163	case FTS_DP:
	164	if (p->fts_number == SKIPPED)
	165	continue;
	166	break;
d1e4967d	167	}
7f9ef9cc KB	168
	169	if (!fflag &&
	170	!check(p->fts_path, p->fts_accpath, &p->fts_statb))
	171	continue;
	172
	173	/*
	174	* If we can't read or search the directory, may still be
	175	* able to remove it. Don't print out the un{read,search}able
	176	* message unless the remove fails.
	177	*/
307d7749	178	if (p->fts_info == FTS_DP \|\| p->fts_info == FTS_DNR) {
7f9ef9cc KB	179	if (!rmdir(p->fts_accpath))
	180	continue;
	181	if (errno == ENOENT) {
	182	if (fflag)
	183	continue;
	184	} else if (p->fts_info != FTS_DP)
307d7749 KB	185	(void)fprintf(stderr,
307d7749 KB	186	"rm: unable to read %s.\n", p->fts_path);
7f9ef9cc	187	} else if (!unlink(p->fts_accpath) \|\| fflag && errno == ENOENT)
307d7749	188	continue;
7f9ef9cc	189	error(p->fts_path, errno);
ae80f4a2	190	}
7f9ef9cc KB	191	}
	192
	193	rmfile(argv)
	194	char **argv;
	195	{
	196	register int df;
	197	register char *f;
	198	struct stat sb;
ae80f4a2	199
7f9ef9cc KB	200	df = dflag;
	201	/*
	202	* Remove a file. POSIX 1003.2 states that, by default, attempting
	203	* to remove a directory is an error, so must always stat the file.
	204	*/
	205	while (f = *argv++) {
	206	/* Assume if can't stat the file, can't unlink it. */
	207	if (lstat(f, &sb)) {
	208	if (!fflag \|\| errno != ENOENT)
	209	error(f, errno);
	210	continue;
ae80f4a2	211	}
7f9ef9cc	212	if (S_ISDIR(sb.st_mode) && !df) {
307d7749	213	(void)fprintf(stderr, "rm: %s: is a directory\n", f);
7f9ef9cc KB	214	retval = 1;
7f9ef9cc KB	215	continue;
b2704a87	216	}
7f9ef9cc KB	217	if (!fflag && !check(f, f, &sb))
	218	continue;
	219	if ((S_ISDIR(sb.st_mode) ? rmdir(f) : unlink(f)) &&
	220	(!fflag \|\| errno != ENOENT))
	221	error(f, errno);
ae80f4a2 BJ	222	}
	223	}
	224
7f9ef9cc KB	225	check(path, name, sp)
	226	char path, name;
	227	struct stat *sp;
ae80f4a2	228	{
7f9ef9cc KB	229	register int first, ch;
7f9ef9cc KB	230	char modep[15], user_from_uid(), group_from_gid();
ae80f4a2	231
7f9ef9cc KB	232	/* Check -i first. */
	233	if (iflag)
	234	(void)fprintf(stderr, "remove %s? ", path);
	235	else {
	236	/*
	237	* If it's not a symbolic link and it's unwritable and we're
	238	* talking to a terminal, ask. Symbolic links are excluded
307d7749	239	* because their permissions are meaningless.
7f9ef9cc KB	240	*/
	241	if (S_ISLNK(sp->st_mode) \|\| !stdin_ok \|\| !access(name, W_OK))
	242	return(1);
	243	strmode(sp->st_mode, modep);
	244	(void)fprintf(stderr, "override %s%s%s/%s for %s? ",
	245	modep + 1, modep[9] == ' ' ? "" : " ",
	246	user_from_uid(sp->st_uid, 0),
	247	group_from_gid(sp->st_gid, 0), path);
	248	}
	249	(void)fflush(stderr);
	250
	251	first = ch = getchar();
	252	while (ch != '\n' && ch != EOF)
	253	ch = getchar();
	254	return(first == 'y');
d1e4967d RC	255	}
d1e4967d RC	256
7f9ef9cc KB	257	#define ISDOT(a) ((a)[0] == '.' && (!(a)[1] \|\| (a)[1] == '.' && !(a)[2]))
	258	checkdot(argv)
	259	char **argv;
	260	{
	261	register char p, t, *save;
	262	int complained;
	263
	264	complained = 0;
	265	for (t = argv; *t;) {
	266	if (p = rindex(*t, '/'))
	267	++p;
	268	else
	269	p = *t;
	270	if (ISDOT(p)) {
	271	if (!complained++)
	272	(void)fprintf(stderr,
	273	"rm: \".\" and \"..\" may not be removed.\n");
	274	retval = 1;
	275	for (save = t; t[0] = t[1]; ++t);
	276	t = save;
	277	} else
	278	++t;
	279	}
	280	}
	281
	282	error(name, val)
731d7e2f	283	char *name;
7f9ef9cc	284	int val;
d1e4967d	285	{
7f9ef9cc KB	286	(void)fprintf(stderr, "rm: %s: %s.\n", name, strerror(val));
7f9ef9cc KB	287	retval = 1;
ae80f4a2	288	}
8161a03a KB	289
	290	usage()
	291	{
7f9ef9cc	292	(void)fprintf(stderr, "usage: rm [-dfiRr] file ...\n");
8161a03a KB	293	exit(1);
8161a03a KB	294	}