4.4BSD/usr/src/bin/rm/rm.c
/*-
* Copyright (c) 1990, 1993
* 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
static char copyright[] =
"@(#) Copyright (c) 1990, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)rm.c 8.1 (Berkeley) 6/2/93";
#endif /* not lint */
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/errno.h>
#include <err.h>
#include <fts.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
int dflag, fflag, iflag, eval, stdin_ok;
int check __P((char *, char *, struct stat *));
void checkdot __P((char **));
void rmfile __P((char **));
void rmtree __P((char **));
void usage __P((void));
/*
* 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(argc, argv)
int argc;
char *argv[];
{
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 (eval);
stdin_ok = isatty(STDIN_FILENO);
if (rflag)
rmtree(argv);
else
rmfile(argv);
exit (eval);
}
void
rmtree(argv)
char **argv;
{
register FTS *fts;
register FTSENT *p;
register int needstat;
/*
* 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)))
err(1, NULL);
while (p = fts_read(fts)) {
switch (p->fts_info) {
case FTS_DNR:
if (!fflag || errno != ENOENT) {
warn("%s", p->fts_path);
eval = 1;
}
continue;
case FTS_ERR:
err(1, "%s", p->fts_path);
case FTS_NS:
/*
* FTS_NS: assume that if can't stat the file, it
* can't be unlinked.
*/
if (!needstat)
break;
if (!fflag || errno != ENOENT) {
warn("%s", p->fts_path);
eval = 1;
}
continue;
case FTS_D:
/* Pre-order: give user chance to skip. */
if (iflag && !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;
}
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)
warnx("%s: unable to read", p->fts_path);
} else if (!unlink(p->fts_accpath) || fflag && errno == ENOENT)
continue;
warn("%s", p->fts_path);
eval = 1;
}
}
void
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) {
warn("%s", f);
eval = 1;
}
continue;
}
if (S_ISDIR(sb.st_mode) && !df) {
warnx("%s: is a directory", f);
eval = 1;
continue;
}
if (!fflag && !check(f, f, &sb))
continue;
if ((S_ISDIR(sb.st_mode) ? rmdir(f) : unlink(f)) &&
(!fflag || errno != ENOENT)) {
warn("%s", f);
eval = 1;
}
}
}
int
check(path, name, sp)
char *path, *name;
struct stat *sp;
{
register int first, ch;
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.
*/
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]))
void
checkdot(argv)
char **argv;
{
register char *p, **t, **save;
int complained;
complained = 0;
for (t = argv; *t;) {
if (p = strrchr(*t, '/'))
++p;
else
p = *t;
if (ISDOT(p)) {
if (!complained++)
warnx("\".\" and \"..\" may not be removed");
eval = 1;
for (save = t; t[0] = t[1]; ++t);
t = save;
} else
++t;
}
}
void
usage()
{
(void)fprintf(stderr, "usage: rm [-dfiRr] file ...\n");
exit(1);
}