minix/lib/libc/gen/fts.c
Ben Gras 2fe8fb192f Full switch to clang/ELF. Drop ack. Simplify.
There is important information about booting non-ack images in
docs/UPDATING. ack/aout-format images can't be built any more, and
booting clang/ELF-format ones is a little different. Updating to the
new boot monitor is recommended.

Changes in this commit:

	. drop boot monitor -> allowing dropping ack support
	. facility to copy ELF boot files to /boot so that old boot monitor
	  can still boot fairly easily, see UPDATING
	. no more ack-format libraries -> single-case libraries
	. some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases
	. drop several ack toolchain commands, but not all support
	  commands (e.g. aal is gone but acksize is not yet).
	. a few libc files moved to netbsd libc dir
	. new /bin/date as minix date used code in libc/
	. test compile fix
	. harmonize includes
	. /usr/lib is no longer special: without ack, /usr/lib plays no
	  kind of special bootstrapping role any more and bootstrapping
	  is done exclusively through packages, so releases depend even
	  less on the state of the machine making them now.
	. rename nbsd_lib* to lib*
	. reduce mtree
2012-02-14 14:52:02 +01:00

1227 lines
31 KiB
C

/* $NetBSD: fts.c,v 1.40 2009/11/02 17:17:34 stacktic Exp $ */
/*-
* Copyright (c) 1990, 1993, 1994
* 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. 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.
*/
#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)fts.c 8.6 (Berkeley) 8/14/94";
#else
__RCSID("$NetBSD: fts.c,v 1.40 2009/11/02 17:17:34 stacktic Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
#include <sys/param.h>
#include <sys/stat.h>
#include <assert.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <fts.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#if ! HAVE_NBTOOL_CONFIG_H
#ifndef __minix
#define HAVE_STRUCT_DIRENT_D_NAMLEN
#endif
#endif
static FTSENT *fts_alloc(FTS *, const char *, size_t);
static FTSENT *fts_build(FTS *, int);
static void fts_free(FTSENT *);
static void fts_lfree(FTSENT *);
static void fts_load(FTS *, FTSENT *);
static size_t fts_maxarglen(char * const *);
static size_t fts_pow2(size_t);
static int fts_palloc(FTS *, size_t);
static void fts_padjust(FTS *, FTSENT *);
static FTSENT *fts_sort(FTS *, FTSENT *, size_t);
static unsigned short fts_stat(FTS *, FTSENT *, int);
static int fts_safe_changedir(const FTS *, const FTSENT *, int,
const char *);
#if defined(ALIGNBYTES) && defined(ALIGN)
#define FTS_ALLOC_ALIGNED 1
#else
#undef FTS_ALLOC_ALIGNED
#endif
#define ISDOT(a) (a[0] == '.' && (!a[1] || (a[1] == '.' && !a[2])))
#define CLR(opt) (sp->fts_options &= ~(opt))
#define ISSET(opt) (sp->fts_options & (opt))
#define SET(opt) (sp->fts_options |= (opt))
#define CHDIR(sp, path) (!ISSET(FTS_NOCHDIR) && chdir(path))
#define FCHDIR(sp, fd) (!ISSET(FTS_NOCHDIR) && fchdir(fd))
/* fts_build flags */
#define BCHILD 1 /* fts_children */
#define BNAMES 2 /* fts_children, names only */
#define BREAD 3 /* fts_read */
#ifndef DTF_HIDEW
#undef FTS_WHITEOUT
#endif
FTS *
fts_open(char * const *argv, int options,
int (*compar)(const FTSENT **, const FTSENT **))
{
FTS *sp;
FTSENT *p, *root;
size_t nitems;
FTSENT *parent, *tmp = NULL; /* pacify gcc */
size_t len;
_DIAGASSERT(argv != NULL);
/* Options check. */
if (options & ~FTS_OPTIONMASK) {
errno = EINVAL;
return (NULL);
}
/* Allocate/initialize the stream */
if ((sp = malloc((unsigned int)sizeof(FTS))) == NULL)
return (NULL);
memset(sp, 0, sizeof(FTS));
sp->fts_compar = compar;
sp->fts_options = options;
/* Logical walks turn on NOCHDIR; symbolic links are too hard. */
if (ISSET(FTS_LOGICAL))
SET(FTS_NOCHDIR);
/*
* Start out with 1K of path space, and enough, in any case,
* to hold the user's paths.
*/
if (fts_palloc(sp, MAX(fts_maxarglen(argv), MAXPATHLEN)))
goto mem1;
/* Allocate/initialize root's parent. */
if ((parent = fts_alloc(sp, "", 0)) == NULL)
goto mem2;
parent->fts_level = FTS_ROOTPARENTLEVEL;
/* Allocate/initialize root(s). */
for (root = NULL, nitems = 0; *argv; ++argv, ++nitems) {
/* Don't allow zero-length paths. */
if ((len = strlen(*argv)) == 0) {
errno = ENOENT;
goto mem3;
}
if ((p = fts_alloc(sp, *argv, len)) == NULL)
goto mem3;
p->fts_level = FTS_ROOTLEVEL;
p->fts_parent = parent;
p->fts_accpath = p->fts_name;
p->fts_info = fts_stat(sp, p, ISSET(FTS_COMFOLLOW));
/* Command-line "." and ".." are real directories. */
if (p->fts_info == FTS_DOT)
p->fts_info = FTS_D;
/*
* If comparison routine supplied, traverse in sorted
* order; otherwise traverse in the order specified.
*/
if (compar) {
p->fts_link = root;
root = p;
} else {
p->fts_link = NULL;
if (root == NULL)
tmp = root = p;
else {
tmp->fts_link = p;
tmp = p;
}
}
}
if (compar && nitems > 1)
root = fts_sort(sp, root, nitems);
/*
* Allocate a dummy pointer and make fts_read think that we've just
* finished the node before the root(s); set p->fts_info to FTS_INIT
* so that everything about the "current" node is ignored.
*/
if ((sp->fts_cur = fts_alloc(sp, "", 0)) == NULL)
goto mem3;
sp->fts_cur->fts_link = root;
sp->fts_cur->fts_info = FTS_INIT;
/*
* If using chdir(2), grab a file descriptor pointing to dot to insure
* that we can get back here; this could be avoided for some paths,
* but almost certainly not worth the effort. Slashes, symbolic links,
* and ".." are all fairly nasty problems. Note, if we can't get the
* descriptor we run anyway, just more slowly.
*/
if (!ISSET(FTS_NOCHDIR)) {
if ((sp->fts_rfd = open(".", O_RDONLY, 0)) == -1)
SET(FTS_NOCHDIR);
else if (fcntl(sp->fts_rfd, F_SETFD, FD_CLOEXEC) == -1) {
close(sp->fts_rfd);
SET(FTS_NOCHDIR);
}
}
if (nitems == 0)
fts_free(parent);
return (sp);
mem3: fts_lfree(root);
fts_free(parent);
mem2: free(sp->fts_path);
mem1: free(sp);
return (NULL);
}
static void
fts_load(FTS *sp, FTSENT *p)
{
size_t len;
char *cp;
_DIAGASSERT(sp != NULL);
_DIAGASSERT(p != NULL);
/*
* Load the stream structure for the next traversal. Since we don't
* actually enter the directory until after the preorder visit, set
* the fts_accpath field specially so the chdir gets done to the right
* place and the user can access the first node. From fts_open it's
* known that the path will fit.
*/
len = p->fts_pathlen = p->fts_namelen;
memmove(sp->fts_path, p->fts_name, len + 1);
if ((cp = strrchr(p->fts_name, '/')) && (cp != p->fts_name || cp[1])) {
len = strlen(++cp);
memmove(p->fts_name, cp, len + 1);
p->fts_namelen = len;
}
p->fts_accpath = p->fts_path = sp->fts_path;
sp->fts_dev = p->fts_dev;
}
int
fts_close(FTS *sp)
{
FTSENT *freep, *p;
int saved_errno = 0;
_DIAGASSERT(sp != NULL);
/*
* This still works if we haven't read anything -- the dummy structure
* points to the root list, so we step through to the end of the root
* list which has a valid parent pointer.
*/
if (sp->fts_cur) {
if (sp->fts_cur->fts_flags & FTS_SYMFOLLOW)
(void)close(sp->fts_cur->fts_symfd);
for (p = sp->fts_cur; p->fts_level >= FTS_ROOTLEVEL;) {
freep = p;
p = p->fts_link ? p->fts_link : p->fts_parent;
fts_free(freep);
}
fts_free(p);
}
/* Free up child linked list, sort array, path buffer. */
if (sp->fts_child)
fts_lfree(sp->fts_child);
if (sp->fts_array)
free(sp->fts_array);
free(sp->fts_path);
/* Return to original directory, save errno if necessary. */
if (!ISSET(FTS_NOCHDIR)) {
if (fchdir(sp->fts_rfd) == -1)
saved_errno = errno;
(void)close(sp->fts_rfd);
}
/* Free up the stream pointer. */
free(sp);
if (saved_errno) {
errno = saved_errno;
return -1;
}
return 0;
}
#if !defined(__FTS_COMPAT_TAILINGSLASH)
/*
* Special case of "/" at the end of the path so that slashes aren't
* appended which would cause paths to be written as "....//foo".
*/
#define NAPPEND(p) \
(p->fts_path[p->fts_pathlen - 1] == '/' \
? p->fts_pathlen - 1 : p->fts_pathlen)
#else /* !defined(__FTS_COMPAT_TAILINGSLASH) */
/*
* compatibility with the old behaviour.
*
* Special case a root of "/" so that slashes aren't appended which would
* cause paths to be written as "//foo".
*/
#define NAPPEND(p) \
(p->fts_level == FTS_ROOTLEVEL && p->fts_pathlen == 1 && \
p->fts_path[0] == '/' ? 0 : p->fts_pathlen)
#endif /* !defined(__FTS_COMPAT_TAILINGSLASH) */
FTSENT *
fts_read(FTS *sp)
{
FTSENT *p, *tmp;
int instr;
char *t;
int saved_errno;
_DIAGASSERT(sp != NULL);
/* If finished or unrecoverable error, return NULL. */
if (sp->fts_cur == NULL || ISSET(FTS_STOP))
return (NULL);
/* Set current node pointer. */
p = sp->fts_cur;
/* Save and zero out user instructions. */
instr = p->fts_instr;
p->fts_instr = FTS_NOINSTR;
/* Any type of file may be re-visited; re-stat and re-turn. */
if (instr == FTS_AGAIN) {
p->fts_info = fts_stat(sp, p, 0);
return (p);
}
/*
* Following a symlink -- SLNONE test allows application to see
* SLNONE and recover. If indirecting through a symlink, have
* keep a pointer to current location. If unable to get that
* pointer, follow fails.
*/
if (instr == FTS_FOLLOW &&
(p->fts_info == FTS_SL || p->fts_info == FTS_SLNONE)) {
p->fts_info = fts_stat(sp, p, 1);
if (p->fts_info == FTS_D && !ISSET(FTS_NOCHDIR)) {
if ((p->fts_symfd = open(".", O_RDONLY, 0)) == -1) {
p->fts_errno = errno;
p->fts_info = FTS_ERR;
} else if (fcntl(p->fts_symfd, F_SETFD, FD_CLOEXEC) == -1) {
p->fts_errno = errno;
p->fts_info = FTS_ERR;
close(p->fts_symfd);
} else
p->fts_flags |= FTS_SYMFOLLOW;
}
return (p);
}
/* Directory in pre-order. */
if (p->fts_info == FTS_D) {
/* If skipped or crossed mount point, do post-order visit. */
if (instr == FTS_SKIP ||
(ISSET(FTS_XDEV) && p->fts_dev != sp->fts_dev)) {
if (p->fts_flags & FTS_SYMFOLLOW)
(void)close(p->fts_symfd);
if (sp->fts_child) {
fts_lfree(sp->fts_child);
sp->fts_child = NULL;
}
p->fts_info = FTS_DP;
return (p);
}
/* Rebuild if only read the names and now traversing. */
if (sp->fts_child && ISSET(FTS_NAMEONLY)) {
CLR(FTS_NAMEONLY);
fts_lfree(sp->fts_child);
sp->fts_child = NULL;
}
/*
* Cd to the subdirectory.
*
* If have already read and now fail to chdir, whack the list
* to make the names come out right, and set the parent errno
* so the application will eventually get an error condition.
* Set the FTS_DONTCHDIR flag so that when we logically change
* directories back to the parent we don't do a chdir.
*
* If haven't read do so. If the read fails, fts_build sets
* FTS_STOP or the fts_info field of the node.
*/
if (sp->fts_child) {
if (fts_safe_changedir(sp, p, -1, p->fts_accpath)) {
p->fts_errno = errno;
p->fts_flags |= FTS_DONTCHDIR;
for (p = sp->fts_child; p; p = p->fts_link)
p->fts_accpath =
p->fts_parent->fts_accpath;
}
} else if ((sp->fts_child = fts_build(sp, BREAD)) == NULL) {
if (ISSET(FTS_STOP))
return (NULL);
return (p);
}
p = sp->fts_child;
sp->fts_child = NULL;
goto name;
}
/* Move to the next node on this level. */
next: tmp = p;
if ((p = p->fts_link) != NULL) {
fts_free(tmp);
/*
* If reached the top, return to the original directory, and
* load the paths for the next root.
*/
if (p->fts_level == FTS_ROOTLEVEL) {
if (FCHDIR(sp, sp->fts_rfd)) {
SET(FTS_STOP);
return (NULL);
}
fts_load(sp, p);
return (sp->fts_cur = p);
}
/*
* User may have called fts_set on the node. If skipped,
* ignore. If followed, get a file descriptor so we can
* get back if necessary.
*/
if (p->fts_instr == FTS_SKIP)
goto next;
if (p->fts_instr == FTS_FOLLOW) {
p->fts_info = fts_stat(sp, p, 1);
if (p->fts_info == FTS_D && !ISSET(FTS_NOCHDIR)) {
if ((p->fts_symfd =
open(".", O_RDONLY, 0)) == -1) {
p->fts_errno = errno;
p->fts_info = FTS_ERR;
} else if (fcntl(p->fts_symfd, F_SETFD, FD_CLOEXEC) == -1) {
p->fts_errno = errno;
p->fts_info = FTS_ERR;
close(p->fts_symfd);
} else
p->fts_flags |= FTS_SYMFOLLOW;
}
p->fts_instr = FTS_NOINSTR;
}
name: t = sp->fts_path + NAPPEND(p->fts_parent);
*t++ = '/';
memmove(t, p->fts_name, (size_t)(p->fts_namelen + 1));
return (sp->fts_cur = p);
}
/* Move up to the parent node. */
p = tmp->fts_parent;
fts_free(tmp);
if (p->fts_level == FTS_ROOTPARENTLEVEL) {
/*
* Done; free everything up and set errno to 0 so the user
* can distinguish between error and EOF.
*/
fts_free(p);
errno = 0;
return (sp->fts_cur = NULL);
}
/* Nul terminate the pathname. */
sp->fts_path[p->fts_pathlen] = '\0';
/*
* Return to the parent directory. If at a root node or came through
* a symlink, go back through the file descriptor. Otherwise, cd up
* one directory.
*/
if (p->fts_level == FTS_ROOTLEVEL) {
if (FCHDIR(sp, sp->fts_rfd)) {
SET(FTS_STOP);
return (NULL);
}
} else if (p->fts_flags & FTS_SYMFOLLOW) {
if (FCHDIR(sp, p->fts_symfd)) {
saved_errno = errno;
(void)close(p->fts_symfd);
errno = saved_errno;
SET(FTS_STOP);
return (NULL);
}
(void)close(p->fts_symfd);
} else if (!(p->fts_flags & FTS_DONTCHDIR) &&
fts_safe_changedir(sp, p->fts_parent, -1, "..")) {
SET(FTS_STOP);
return (NULL);
}
p->fts_info = p->fts_errno ? FTS_ERR : FTS_DP;
return (sp->fts_cur = p);
}
/*
* Fts_set takes the stream as an argument although it's not used in this
* implementation; it would be necessary if anyone wanted to add global
* semantics to fts using fts_set. An error return is allowed for similar
* reasons.
*/
/* ARGSUSED */
int
fts_set(FTS *sp, FTSENT *p, int instr)
{
_DIAGASSERT(sp != NULL);
_DIAGASSERT(p != NULL);
if (instr && instr != FTS_AGAIN && instr != FTS_FOLLOW &&
instr != FTS_NOINSTR && instr != FTS_SKIP) {
errno = EINVAL;
return (1);
}
p->fts_instr = instr;
return (0);
}
FTSENT *
fts_children(FTS *sp, int instr)
{
FTSENT *p;
int fd;
_DIAGASSERT(sp != NULL);
if (instr && instr != FTS_NAMEONLY) {
errno = EINVAL;
return (NULL);
}
/* Set current node pointer. */
p = sp->fts_cur;
/*
* Errno set to 0 so user can distinguish empty directory from
* an error.
*/
errno = 0;
/* Fatal errors stop here. */
if (ISSET(FTS_STOP))
return (NULL);
/* Return logical hierarchy of user's arguments. */
if (p->fts_info == FTS_INIT)
return (p->fts_link);
/*
* If not a directory being visited in pre-order, stop here. Could
* allow FTS_DNR, assuming the user has fixed the problem, but the
* same effect is available with FTS_AGAIN.
*/
if (p->fts_info != FTS_D /* && p->fts_info != FTS_DNR */)
return (NULL);
/* Free up any previous child list. */
if (sp->fts_child)
fts_lfree(sp->fts_child);
if (instr == FTS_NAMEONLY) {
SET(FTS_NAMEONLY);
instr = BNAMES;
} else
instr = BCHILD;
/*
* If using chdir on a relative path and called BEFORE fts_read does
* its chdir to the root of a traversal, we can lose -- we need to
* chdir into the subdirectory, and we don't know where the current
* directory is, so we can't get back so that the upcoming chdir by
* fts_read will work.
*/
if (p->fts_level != FTS_ROOTLEVEL || p->fts_accpath[0] == '/' ||
ISSET(FTS_NOCHDIR))
return (sp->fts_child = fts_build(sp, instr));
if ((fd = open(".", O_RDONLY, 0)) == -1)
return (sp->fts_child = NULL);
sp->fts_child = fts_build(sp, instr);
if (fchdir(fd)) {
(void)close(fd);
return (NULL);
}
(void)close(fd);
return (sp->fts_child);
}
/*
* This is the tricky part -- do not casually change *anything* in here. The
* idea is to build the linked list of entries that are used by fts_children
* and fts_read. There are lots of special cases.
*
* The real slowdown in walking the tree is the stat calls. If FTS_NOSTAT is
* set and it's a physical walk (so that symbolic links can't be directories),
* we can do things quickly. First, if it's a 4.4BSD file system, the type
* of the file is in the directory entry. Otherwise, we assume that the number
* of subdirectories in a node is equal to the number of links to the parent.
* The former skips all stat calls. The latter skips stat calls in any leaf
* directories and for any files after the subdirectories in the directory have
* been found, cutting the stat calls by about 2/3.
*/
static FTSENT *
fts_build(FTS *sp, int type)
{
struct dirent *dp;
FTSENT *p, *head;
size_t nitems;
FTSENT *cur, *tail;
DIR *dirp;
void *oldaddr;
size_t dnamlen;
int cderrno, descend, level, nlinks, saved_errno, nostat, doadjust;
size_t len, maxlen;
#ifdef FTS_WHITEOUT
int oflag;
#endif
char *cp = NULL; /* pacify gcc */
_DIAGASSERT(sp != NULL);
/* Set current node pointer. */
cur = sp->fts_cur;
/*
* Open the directory for reading. If this fails, we're done.
* If being called from fts_read, set the fts_info field.
*/
#ifdef FTS_WHITEOUT
if (ISSET(FTS_WHITEOUT))
oflag = DTF_NODUP|DTF_REWIND;
else
oflag = DTF_HIDEW|DTF_NODUP|DTF_REWIND;
#else
#define __opendir2(path, flag) opendir(path)
#endif
if ((dirp = __opendir2(cur->fts_accpath, oflag)) == NULL) {
if (type == BREAD) {
cur->fts_info = FTS_DNR;
cur->fts_errno = errno;
}
return (NULL);
}
/*
* Nlinks is the number of possible entries of type directory in the
* directory if we're cheating on stat calls, 0 if we're not doing
* any stat calls at all, -1 if we're doing stats on everything.
*/
if (type == BNAMES) {
nlinks = 0;
nostat = 1;
} else if (ISSET(FTS_NOSTAT) && ISSET(FTS_PHYSICAL)) {
nlinks = cur->fts_nlink - (ISSET(FTS_SEEDOT) ? 0 : 2);
nostat = 1;
} else {
nlinks = -1;
nostat = 0;
}
#ifdef notdef
(void)printf("nlinks == %d (cur: %d)\n", nlinks, cur->fts_nlink);
(void)printf("NOSTAT %d PHYSICAL %d SEEDOT %d\n",
ISSET(FTS_NOSTAT), ISSET(FTS_PHYSICAL), ISSET(FTS_SEEDOT));
#endif
/*
* If we're going to need to stat anything or we want to descend
* and stay in the directory, chdir. If this fails we keep going,
* but set a flag so we don't chdir after the post-order visit.
* We won't be able to stat anything, but we can still return the
* names themselves. Note, that since fts_read won't be able to
* chdir into the directory, it will have to return different path
* names than before, i.e. "a/b" instead of "b". Since the node
* has already been visited in pre-order, have to wait until the
* post-order visit to return the error. There is a special case
* here, if there was nothing to stat then it's not an error to
* not be able to stat. This is all fairly nasty. If a program
* needed sorted entries or stat information, they had better be
* checking FTS_NS on the returned nodes.
*/
cderrno = 0;
if (nlinks || type == BREAD) {
if (fts_safe_changedir(sp, cur, dirfd(dirp), NULL)) {
if (nlinks && type == BREAD)
cur->fts_errno = errno;
cur->fts_flags |= FTS_DONTCHDIR;
descend = 0;
cderrno = errno;
} else
descend = 1;
} else
descend = 0;
/*
* Figure out the max file name length that can be stored in the
* current path -- the inner loop allocates more path as necessary.
* We really wouldn't have to do the maxlen calculations here, we
* could do them in fts_read before returning the path, but it's a
* lot easier here since the length is part of the dirent structure.
*
* If not changing directories set a pointer so that can just append
* each new name into the path.
*/
len = NAPPEND(cur);
if (ISSET(FTS_NOCHDIR)) {
cp = sp->fts_path + len;
*cp++ = '/';
}
len++;
maxlen = sp->fts_pathlen - len;
#if defined(__FTS_COMPAT_LEVEL)
if (cur->fts_level == SHRT_MAX) {
(void)closedir(dirp);
cur->fts_info = FTS_ERR;
SET(FTS_STOP);
errno = ENAMETOOLONG;
return (NULL);
}
#endif
level = cur->fts_level + 1;
/* Read the directory, attaching each entry to the `link' pointer. */
doadjust = 0;
for (head = tail = NULL, nitems = 0; (dp = readdir(dirp)) != NULL;) {
if (!ISSET(FTS_SEEDOT) && ISDOT(dp->d_name))
continue;
#if defined(HAVE_STRUCT_DIRENT_D_NAMLEN)
dnamlen = dp->d_namlen;
#else
dnamlen = strlen(dp->d_name);
#endif
if ((p = fts_alloc(sp, dp->d_name, dnamlen)) == NULL)
goto mem1;
if (dnamlen >= maxlen) { /* include space for NUL */
oldaddr = sp->fts_path;
if (fts_palloc(sp, dnamlen + len + 1)) {
/*
* No more memory for path or structures. Save
* errno, free up the current structure and the
* structures already allocated.
*/
mem1: saved_errno = errno;
if (p)
fts_free(p);
fts_lfree(head);
(void)closedir(dirp);
errno = saved_errno;
cur->fts_info = FTS_ERR;
SET(FTS_STOP);
return (NULL);
}
/* Did realloc() change the pointer? */
if (oldaddr != sp->fts_path) {
doadjust = 1;
if (ISSET(FTS_NOCHDIR))
cp = sp->fts_path + len;
}
maxlen = sp->fts_pathlen - len;
}
#if defined(__FTS_COMPAT_LENGTH)
if (len + dnamlen >= USHRT_MAX) {
/*
* In an FTSENT, fts_pathlen is an unsigned short
* so it is possible to wraparound here.
* If we do, free up the current structure and the
* structures already allocated, then error out
* with ENAMETOOLONG.
*/
fts_free(p);
fts_lfree(head);
(void)closedir(dirp);
cur->fts_info = FTS_ERR;
SET(FTS_STOP);
errno = ENAMETOOLONG;
return (NULL);
}
#endif
p->fts_level = level;
p->fts_pathlen = len + dnamlen;
p->fts_parent = sp->fts_cur;
#ifdef FTS_WHITEOUT
if (dp->d_type == DT_WHT)
p->fts_flags |= FTS_ISW;
#endif
if (cderrno) {
if (nlinks) {
p->fts_info = FTS_NS;
p->fts_errno = cderrno;
} else
p->fts_info = FTS_NSOK;
p->fts_accpath = cur->fts_accpath;
} else if (nlinks == 0
#ifdef DT_DIR
|| (nostat &&
dp->d_type != DT_DIR && dp->d_type != DT_UNKNOWN)
#endif
) {
p->fts_accpath =
ISSET(FTS_NOCHDIR) ? p->fts_path : p->fts_name;
p->fts_info = FTS_NSOK;
} else {
/* Build a file name for fts_stat to stat. */
if (ISSET(FTS_NOCHDIR)) {
p->fts_accpath = p->fts_path;
memmove(cp, p->fts_name,
(size_t)(p->fts_namelen + 1));
} else
p->fts_accpath = p->fts_name;
/* Stat it. */
p->fts_info = fts_stat(sp, p, 0);
/* Decrement link count if applicable. */
if (nlinks > 0 && (p->fts_info == FTS_D ||
p->fts_info == FTS_DC || p->fts_info == FTS_DOT))
--nlinks;
}
/* We walk in directory order so "ls -f" doesn't get upset. */
p->fts_link = NULL;
if (head == NULL)
head = tail = p;
else {
tail->fts_link = p;
tail = p;
}
++nitems;
}
(void)closedir(dirp);
/*
* If had to realloc the path, adjust the addresses for the rest
* of the tree.
*/
if (doadjust)
fts_padjust(sp, head);
/*
* If not changing directories, reset the path back to original
* state.
*/
if (ISSET(FTS_NOCHDIR)) {
if (len == sp->fts_pathlen || nitems == 0)
--cp;
*cp = '\0';
}
/*
* If descended after called from fts_children or after called from
* fts_read and nothing found, get back. At the root level we use
* the saved fd; if one of fts_open()'s arguments is a relative path
* to an empty directory, we wind up here with no other way back. If
* can't get back, we're done.
*/
if (descend && (type == BCHILD || !nitems) &&
(cur->fts_level == FTS_ROOTLEVEL ?
FCHDIR(sp, sp->fts_rfd) :
fts_safe_changedir(sp, cur->fts_parent, -1, ".."))) {
cur->fts_info = FTS_ERR;
SET(FTS_STOP);
return (NULL);
}
/* If didn't find anything, return NULL. */
if (!nitems) {
if (type == BREAD)
cur->fts_info = FTS_DP;
return (NULL);
}
/* Sort the entries. */
if (sp->fts_compar && nitems > 1)
head = fts_sort(sp, head, nitems);
return (head);
}
static unsigned short
fts_stat(FTS *sp, FTSENT *p, int follow)
{
FTSENT *t;
dev_t dev;
__fts_ino_t ino;
__fts_stat_t *sbp, sb;
int saved_errno;
_DIAGASSERT(sp != NULL);
_DIAGASSERT(p != NULL);
/* If user needs stat info, stat buffer already allocated. */
sbp = ISSET(FTS_NOSTAT) ? &sb : p->fts_statp;
#ifdef FTS_WHITEOUT
/* check for whiteout */
if (p->fts_flags & FTS_ISW) {
if (sbp != &sb) {
memset(sbp, '\0', sizeof (*sbp));
sbp->st_mode = S_IFWHT;
}
return (FTS_W);
}
#endif
/*
* If doing a logical walk, or application requested FTS_FOLLOW, do
* a stat(2). If that fails, check for a non-existent symlink. If
* fail, set the errno from the stat call.
*/
if (ISSET(FTS_LOGICAL) || follow) {
if (stat(p->fts_accpath, sbp)) {
saved_errno = errno;
if (!lstat(p->fts_accpath, sbp)) {
errno = 0;
return (FTS_SLNONE);
}
p->fts_errno = saved_errno;
goto err;
}
} else if (lstat(p->fts_accpath, sbp)) {
p->fts_errno = errno;
err: memset(sbp, 0, sizeof(*sbp));
return (FTS_NS);
}
if (S_ISDIR(sbp->st_mode)) {
/*
* Set the device/inode. Used to find cycles and check for
* crossing mount points. Also remember the link count, used
* in fts_build to limit the number of stat calls. It is
* understood that these fields are only referenced if fts_info
* is set to FTS_D.
*/
dev = p->fts_dev = sbp->st_dev;
ino = p->fts_ino = sbp->st_ino;
p->fts_nlink = sbp->st_nlink;
if (ISDOT(p->fts_name))
return (FTS_DOT);
/*
* Cycle detection is done by brute force when the directory
* is first encountered. If the tree gets deep enough or the
* number of symbolic links to directories is high enough,
* something faster might be worthwhile.
*/
for (t = p->fts_parent;
t->fts_level >= FTS_ROOTLEVEL; t = t->fts_parent)
if (ino == t->fts_ino && dev == t->fts_dev) {
p->fts_cycle = t;
return (FTS_DC);
}
return (FTS_D);
}
if (S_ISLNK(sbp->st_mode))
return (FTS_SL);
if (S_ISREG(sbp->st_mode))
return (FTS_F);
return (FTS_DEFAULT);
}
static FTSENT *
fts_sort(FTS *sp, FTSENT *head, size_t nitems)
{
FTSENT **ap, *p;
_DIAGASSERT(sp != NULL);
_DIAGASSERT(head != NULL);
/*
* Construct an array of pointers to the structures and call qsort(3).
* Reassemble the array in the order returned by qsort. If unable to
* sort for memory reasons, return the directory entries in their
* current order. Allocate enough space for the current needs plus
* 40 so don't realloc one entry at a time.
*/
if (nitems > sp->fts_nitems) {
FTSENT **new;
new = realloc(sp->fts_array, sizeof(FTSENT *) * (nitems + 40));
if (new == 0)
return (head);
sp->fts_array = new;
sp->fts_nitems = nitems + 40;
}
for (ap = sp->fts_array, p = head; p; p = p->fts_link)
*ap++ = p;
qsort((void *)sp->fts_array, nitems, sizeof(FTSENT *),
(int (*)(const void *, const void *))sp->fts_compar);
for (head = *(ap = sp->fts_array); --nitems; ++ap)
ap[0]->fts_link = ap[1];
ap[0]->fts_link = NULL;
return (head);
}
static FTSENT *
fts_alloc(FTS *sp, const char *name, size_t namelen)
{
FTSENT *p;
#if defined(FTS_ALLOC_ALIGNED)
size_t len;
#endif
_DIAGASSERT(sp != NULL);
_DIAGASSERT(name != NULL);
#if defined(FTS_ALLOC_ALIGNED)
/*
* The file name is a variable length array and no stat structure is
* necessary if the user has set the nostat bit. Allocate the FTSENT
* structure, the file name and the stat structure in one chunk, but
* be careful that the stat structure is reasonably aligned. Since the
* fts_name field is declared to be of size 1, the fts_name pointer is
* namelen + 2 before the first possible address of the stat structure.
*/
len = sizeof(FTSENT) + namelen;
if (!ISSET(FTS_NOSTAT))
len += sizeof(*(p->fts_statp)) + ALIGNBYTES;
if ((p = malloc(len)) == NULL)
return (NULL);
if (!ISSET(FTS_NOSTAT))
p->fts_statp = (__fts_stat_t *)ALIGN(
(unsigned long)(p->fts_name + namelen + 2));
#else
if ((p = malloc(sizeof(FTSENT) + namelen)) == NULL)
return (NULL);
if (!ISSET(FTS_NOSTAT))
if ((p->fts_statp = malloc(sizeof(*(p->fts_statp)))) == NULL) {
free(p);
return (NULL);
}
#endif
if (ISSET(FTS_NOSTAT))
p->fts_statp = NULL;
/* Copy the name plus the trailing NULL. */
memmove(p->fts_name, name, namelen + 1);
p->fts_namelen = namelen;
p->fts_path = sp->fts_path;
p->fts_errno = 0;
p->fts_flags = 0;
p->fts_instr = FTS_NOINSTR;
p->fts_number = 0;
p->fts_pointer = NULL;
return (p);
}
static void
fts_free(FTSENT *p)
{
#if !defined(FTS_ALLOC_ALIGNED)
if (p->fts_statp)
free(p->fts_statp);
#endif
free(p);
}
static void
fts_lfree(FTSENT *head)
{
FTSENT *p;
/* XXX: head may be NULL ? */
/* Free a linked list of structures. */
while ((p = head) != NULL) {
head = head->fts_link;
fts_free(p);
}
}
static size_t
fts_pow2(size_t x)
{
x--;
x |= x>>1;
x |= x>>2;
x |= x>>4;
x |= x>>8;
x |= x>>16;
#if LONG_BIT > 32
x |= x>>32;
#endif
#if LONG_BIT > 64
x |= x>>64;
#endif
x++;
return (x);
}
/*
* Allow essentially unlimited paths; find, rm, ls should all work on any tree.
* Most systems will allow creation of paths much longer than MAXPATHLEN, even
* though the kernel won't resolve them. Round up the new size to a power of 2,
* so we don't realloc the path 2 bytes at a time.
*/
static int
fts_palloc(FTS *sp, size_t size)
{
char *new;
_DIAGASSERT(sp != NULL);
#ifdef __FTS_COMPAT_LENGTH
/* Protect against fts_pathlen overflow. */
if (size > USHRT_MAX + 1) {
errno = ENAMETOOLONG;
return (1);
}
#endif
size = fts_pow2(size);
new = realloc(sp->fts_path, size);
if (new == 0)
return (1);
sp->fts_path = new;
sp->fts_pathlen = size;
return (0);
}
/*
* When the path is realloc'd, have to fix all of the pointers in structures
* already returned.
*/
static void
fts_padjust(FTS *sp, FTSENT *head)
{
FTSENT *p;
char *addr;
_DIAGASSERT(sp != NULL);
#define ADJUST(p) do { \
if ((p)->fts_accpath != (p)->fts_name) \
(p)->fts_accpath = \
addr + ((p)->fts_accpath - (p)->fts_path); \
(p)->fts_path = addr; \
} while (/*CONSTCOND*/0)
addr = sp->fts_path;
/* Adjust the current set of children. */
for (p = sp->fts_child; p; p = p->fts_link)
ADJUST(p);
/* Adjust the rest of the tree, including the current level. */
for (p = head; p->fts_level >= FTS_ROOTLEVEL;) {
ADJUST(p);
p = p->fts_link ? p->fts_link : p->fts_parent;
}
}
static size_t
fts_maxarglen(char * const *argv)
{
size_t len, max;
_DIAGASSERT(argv != NULL);
for (max = 0; *argv; ++argv)
if ((len = strlen(*argv)) > max)
max = len;
return (max + 1);
}
/*
* Change to dir specified by fd or p->fts_accpath without getting
* tricked by someone changing the world out from underneath us.
* Assumes p->fts_dev and p->fts_ino are filled in.
*/
static int
fts_safe_changedir(const FTS *sp, const FTSENT *p, int fd, const char *path)
{
int oldfd = fd, ret = -1;
__fts_stat_t sb;
if (ISSET(FTS_NOCHDIR))
return 0;
if (oldfd < 0 && (fd = open(path, O_RDONLY)) == -1)
return -1;
if (fstat(fd, &sb) == -1)
goto bail;
if (sb.st_ino != p->fts_ino || sb.st_dev != p->fts_dev) {
errno = ENOENT;
goto bail;
}
ret = fchdir(fd);
bail:
if (oldfd < 0) {
int save_errno = errno;
(void)close(fd);
errno = save_errno;
}
return ret;
}