/* Traverse a file hierarchy. Copyright (C) 2004, 2005, 2006 Free Software Foundation, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ /*- * 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. * 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. */ #ifdef HAVE_CONFIG_H # include #endif #if defined(LIBC_SCCS) && !defined(lint) static char sccsid[] = "@(#)fts.c 8.6 (Berkeley) 8/14/94"; #endif /* LIBC_SCCS and not lint */ #include "fts_.h" #if HAVE_SYS_PARAM_H || defined _LIBC # include #endif #ifdef _LIBC # include #else # include #endif #include #include #include "dirfd.h" #include #include #include #include #if ! _LIBC # include "lstat.h" #endif #if defined _LIBC # include # define NAMLEN(dirent) _D_EXACT_NAMLEN (dirent) #else # if HAVE_DIRENT_H # include # define NAMLEN(dirent) strlen ((dirent)->d_name) # else # define dirent direct # define NAMLEN(dirent) (dirent)->d_namlen # if HAVE_SYS_NDIR_H # include # endif # if HAVE_SYS_DIR_H # include # endif # if HAVE_NDIR_H # include # endif # endif #endif #ifdef _LIBC # undef close # define close __close # undef closedir # define closedir __closedir # undef fchdir # define fchdir __fchdir # undef open # define open __open # undef opendir # define opendir __opendir # undef readdir # define readdir __readdir #else # undef internal_function # define internal_function /* empty */ #endif #ifndef __set_errno # define __set_errno(Val) errno = (Val) #endif #ifndef __attribute__ # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || __STRICT_ANSI__ # define __attribute__(x) /* empty */ # endif #endif #ifndef ATTRIBUTE_UNUSED # define ATTRIBUTE_UNUSED __attribute__ ((__unused__)) #endif static FTSENT *fts_alloc (FTS *, const char *, size_t) internal_function; static FTSENT *fts_build (FTS *, int) internal_function; static void fts_lfree (FTSENT *) internal_function; static void fts_load (FTS *, FTSENT *) internal_function; static size_t fts_maxarglen (char * const *) internal_function; static void fts_padjust (FTS *, FTSENT *) internal_function; static bool fts_palloc (FTS *, size_t) internal_function; static FTSENT *fts_sort (FTS *, FTSENT *, size_t) internal_function; static unsigned short int fts_stat (FTS *, FTSENT *, bool) internal_function; static int fts_safe_changedir (FTS *, FTSENT *, int, const char *) internal_function; #if _LGPL_PACKAGE static bool enter_dir (FTS *fts, FTSENT *ent) { return true; } static void leave_dir (FTS *fts, FTSENT *ent) {} static bool setup_dir (FTS *fts) { return true; } static void free_dir (FTS *fts) {} #else # include "fcntl--.h" # include "fts-cycle.c" #endif #ifndef MAX # define MAX(a,b) ((a) > (b) ? (a) : (b)) #endif #ifndef SIZE_MAX # define SIZE_MAX ((size_t) -1) #endif #ifndef O_DIRECTORY # define O_DIRECTORY 0 #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 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 */ #if FTS_DEBUG # include # include # include bool fts_debug = false; # define Dprintf(x) do { if (fts_debug) printf x; } while (0) #else # define Dprintf(x) #endif #define LEAVE_DIR(Fts, Ent, Tag) \ do \ { \ Dprintf ((" %s-leaving: %s\n", Tag, (Ent)->fts_path)); \ leave_dir (Fts, Ent); \ } \ while (false) /* Open the directory DIR if possible, and return a file descriptor. Return -1 and set errno on failure. It doesn't matter whether the file descriptor has read or write access. */ static int internal_function diropen (char const *dir) { return open (dir, O_RDONLY | O_DIRECTORY | O_NOCTTY | O_NONBLOCK); } FTS * fts_open (char * const *argv, register int options, int (*compar) (FTSENT const **, FTSENT const **)) { register FTS *sp; register FTSENT *p, *root; register size_t nitems; FTSENT *parent, *tmp = NULL; /* pacify gcc */ size_t len; /* Options check. */ if (options & ~FTS_OPTIONMASK) { __set_errno (EINVAL); return (NULL); } /* Allocate/initialize the stream */ if ((sp = malloc(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 file name space, and enough, in any case, * to hold the user's file names. */ #ifndef MAXPATHLEN # define MAXPATHLEN 1024 #endif { size_t maxarglen = fts_maxarglen(argv); if (! fts_palloc(sp, MAX(maxarglen, 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 != NULL; ++argv, ++nitems) { /* Don't allow zero-length file names. */ if ((len = strlen(*argv)) == 0) { __set_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) != 0); /* 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 (! setup_dir (sp)) goto mem3; /* * If using chdir(2), grab a file descriptor pointing to dot to ensure * that we can get back here; this could be avoided for some file names, * 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) && (sp->fts_rfd = diropen (".")) < 0) SET(FTS_NOCHDIR); return (sp); mem3: fts_lfree(root); free(parent); mem2: free(sp->fts_path); mem1: free(sp); return (NULL); } static void internal_function fts_load (FTS *sp, register FTSENT *p) { register size_t len; register char *cp; /* * 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 file name 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_statp->st_dev; } int fts_close (FTS *sp) { register FTSENT *freep, *p; int saved_errno = 0; /* * 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) { for (p = sp->fts_cur; p->fts_level >= FTS_ROOTLEVEL;) { freep = p; p = p->fts_link != NULL ? p->fts_link : p->fts_parent; free(freep); } free(p); } /* Free up child linked list, sort array, file name 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)) saved_errno = errno; (void)close(sp->fts_rfd); } free_dir (sp); /* Free up the stream pointer. */ free(sp); /* Set errno and return. */ if (saved_errno) { __set_errno (saved_errno); return (-1); } return (0); } /* * Special case of "/" at the end of the file name so that slashes aren't * appended which would cause file names to be written as "....//foo". */ #define NAPPEND(p) \ (p->fts_path[p->fts_pathlen - 1] == '/' \ ? p->fts_pathlen - 1 : p->fts_pathlen) FTSENT * fts_read (register FTS *sp) { register FTSENT *p, *tmp; register unsigned short int instr; register char *t; int saved_errno; /* 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, false); return (p); } Dprintf (("fts_read: p=%s\n", p->fts_info == FTS_INIT ? "" : p->fts_path)); /* * 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, true); if (p->fts_info == FTS_D && !ISSET(FTS_NOCHDIR)) { if ((p->fts_symfd = diropen (".")) < 0) { p->fts_errno = errno; p->fts_info = FTS_ERR; } else p->fts_flags |= FTS_SYMFOLLOW; } goto check_for_dir; } /* 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_statp->st_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; LEAVE_DIR (sp, p, "1"); return (p); } /* Rebuild if only read the names and now traversing. */ if (sp->fts_child != NULL && 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 != NULL) { 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 != NULL; 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); /* If fts_build's call to fts_safe_changedir failed because it was not able to fchdir into a subdirectory, tell the caller. */ if (p->fts_errno) p->fts_info = FTS_ERR; /* FIXME: see if this should be in an else block */ LEAVE_DIR (sp, p, "2"); 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) { free(tmp); /* * If reached the top, return to the original directory (or * the root of the tree), and load the file names for the next * root. */ if (p->fts_level == FTS_ROOTLEVEL) { if (FCHDIR(sp, sp->fts_rfd)) { SET(FTS_STOP); sp->fts_cur = p; return (NULL); } fts_load(sp, p); goto check_for_dir; } /* * 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, true); if (p->fts_info == FTS_D && !ISSET(FTS_NOCHDIR)) { if ((p->fts_symfd = diropen (".")) < 0) { p->fts_errno = errno; p->fts_info = FTS_ERR; } 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, p->fts_namelen + 1); check_for_dir: sp->fts_cur = p; if (p->fts_info == FTS_D) { Dprintf ((" %s-entering: %s\n", sp, p->fts_path)); if (! enter_dir (sp, p)) { __set_errno (ENOMEM); return NULL; } } return p; } /* Move up to the parent node. */ p = tmp->fts_parent; 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. */ free(p); __set_errno (0); return (sp->fts_cur = NULL); } /* NUL terminate the file name. */ 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)) { p->fts_errno = errno; SET(FTS_STOP); } } else if (p->fts_flags & FTS_SYMFOLLOW) { if (FCHDIR(sp, p->fts_symfd)) { saved_errno = errno; (void)close(p->fts_symfd); __set_errno (saved_errno); p->fts_errno = errno; SET(FTS_STOP); } (void)close(p->fts_symfd); } else if (!(p->fts_flags & FTS_DONTCHDIR) && fts_safe_changedir(sp, p->fts_parent, -1, "..")) { p->fts_errno = errno; SET(FTS_STOP); } p->fts_info = p->fts_errno ? FTS_ERR : FTS_DP; if (p->fts_errno == 0) LEAVE_DIR (sp, p, "3"); sp->fts_cur = p; return ISSET(FTS_STOP) ? NULL : 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 ATTRIBUTE_UNUSED, FTSENT *p, int instr) { if (instr != 0 && instr != FTS_AGAIN && instr != FTS_FOLLOW && instr != FTS_NOINSTR && instr != FTS_SKIP) { __set_errno (EINVAL); return (1); } p->fts_instr = instr; return (0); } FTSENT * fts_children (register FTS *sp, int instr) { register FTSENT *p; int fd; if (instr != 0 && instr != FTS_NAMEONLY) { __set_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. */ __set_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 != NULL) fts_lfree(sp->fts_child); if (instr == FTS_NAMEONLY) { SET(FTS_NAMEONLY); instr = BNAMES; } else instr = BCHILD; /* * If using chdir on a relative file name 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 = diropen (".")) < 0) return (sp->fts_child = NULL); sp->fts_child = fts_build(sp, instr); if (fchdir(fd)) { int saved_errno = errno; (void)close(fd); __set_errno (saved_errno); 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 * internal_function fts_build (register FTS *sp, int type) { register struct dirent *dp; register FTSENT *p, *head; register size_t nitems; FTSENT *cur, *tail; DIR *dirp; void *oldaddr; int cderrno; int saved_errno; bool descend; bool doadjust; ptrdiff_t level; nlink_t nlinks; bool nostat; size_t len, maxlen, new_len; char *cp; /* 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. */ #if defined FTS_WHITEOUT && 0 if (ISSET(FTS_WHITEOUT)) oflag = DTF_NODUP|DTF_REWIND; else oflag = DTF_HIDEW|DTF_NODUP|DTF_REWIND; #else # define __opendir2(file, flag) opendir(file) #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, (nlink_t) -1 if we're statting everything. */ if (type == BNAMES) { nlinks = 0; /* Be quiet about nostat, GCC. */ nostat = false; } else if (ISSET(FTS_NOSTAT) && ISSET(FTS_PHYSICAL)) { nlinks = (cur->fts_statp->st_nlink - (ISSET(FTS_SEEDOT) ? 0 : 2)); nostat = true; } else { nlinks = -1; nostat = false; } /* * 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 file * 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 = false; cderrno = errno; closedir(dirp); dirp = NULL; } else descend = true; } else descend = false; /* * Figure out the max file name length that can be stored in the * current buffer -- the inner loop allocates more space as necessary. * We really wouldn't have to do the maxlen calculations here, we * could do them in fts_read before returning the name, 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 component into the file name. */ len = NAPPEND(cur); if (ISSET(FTS_NOCHDIR)) { cp = sp->fts_path + len; *cp++ = '/'; } else { /* GCC, you're too verbose. */ cp = NULL; } len++; maxlen = sp->fts_pathlen - len; level = cur->fts_level + 1; /* Read the directory, attaching each entry to the `link' pointer. */ doadjust = false; for (head = tail = NULL, nitems = 0; dirp && (dp = readdir(dirp));) { if (!ISSET(FTS_SEEDOT) && ISDOT(dp->d_name)) continue; if ((p = fts_alloc(sp, dp->d_name, NAMLEN (dp))) == NULL) goto mem1; if (NAMLEN (dp) >= maxlen) {/* include space for NUL */ oldaddr = sp->fts_path; if (! fts_palloc(sp, NAMLEN (dp) + len + 1)) { /* * No more memory. Save * errno, free up the current structure and the * structures already allocated. */ mem1: saved_errno = errno; if (p) free(p); fts_lfree(head); closedir(dirp); cur->fts_info = FTS_ERR; SET(FTS_STOP); __set_errno (saved_errno); return (NULL); } /* Did realloc() change the pointer? */ if (oldaddr != sp->fts_path) { doadjust = true; if (ISSET(FTS_NOCHDIR)) cp = sp->fts_path + len; } maxlen = sp->fts_pathlen - len; } new_len = len + NAMLEN (dp); if (new_len < len) { /* * In the unlikely even that we would end up * with a file name longer than SIZE_MAX, free up * the current structure and the structures already * allocated, then error out with ENAMETOOLONG. */ free(p); fts_lfree(head); closedir(dirp); cur->fts_info = FTS_ERR; SET(FTS_STOP); __set_errno (ENAMETOOLONG); return (NULL); } p->fts_level = level; p->fts_parent = sp->fts_cur; p->fts_pathlen = new_len; #if defined FTS_WHITEOUT && 0 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 #if HAVE_STRUCT_DIRENT_D_TYPE || (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, p->fts_namelen + 1); } else p->fts_accpath = p->fts_name; /* Stat it. */ p->fts_info = fts_stat(sp, p, false); /* Decrement link count if applicable. */ if (nlinks > 0 && (p->fts_info == FTS_D || p->fts_info == FTS_DC || p->fts_info == FTS_DOT)) nlinks -= nostat; } /* 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; } if (dirp) closedir(dirp); /* * If realloc() changed the address of the file name, adjust the * addresses for the rest of the tree and the dir list. */ if (doadjust) fts_padjust(sp, head); /* * If not changing directories, reset the file name 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 name * 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); } #if FTS_DEBUG /* Walk ->fts_parent links starting at E_CURR, until the root of the current hierarchy. There should be a directory with dev/inode matching those of AD. If not, print a lot of diagnostics. */ static void find_matching_ancestor (FTSENT const *e_curr, struct Active_dir const *ad) { FTSENT const *ent; for (ent = e_curr; ent->fts_level >= FTS_ROOTLEVEL; ent = ent->fts_parent) { if (ad->ino == ent->fts_statp->st_ino && ad->dev == ent->fts_statp->st_dev) return; } printf ("ERROR: tree dir, %s, not active\n", ad->fts_ent->fts_accpath); printf ("active dirs:\n"); for (ent = e_curr; ent->fts_level >= FTS_ROOTLEVEL; ent = ent->fts_parent) printf (" %s(%"PRIuMAX"/%"PRIuMAX") to %s(%"PRIuMAX"/%"PRIuMAX")...\n", ad->fts_ent->fts_accpath, (uintmax_t) ad->dev, (uintmax_t) ad->ino, ent->fts_accpath, (uintmax_t) ent->fts_statp->st_dev, (uintmax_t) ent->fts_statp->st_ino); } void fts_cross_check (FTS const *sp) { FTSENT const *ent = sp->fts_cur; FTSENT const *t; if ( ! ISSET (FTS_TIGHT_CYCLE_CHECK)) return; Dprintf (("fts-cross-check cur=%s\n", ent->fts_path)); /* Make sure every parent dir is in the tree. */ for (t = ent->fts_parent; t->fts_level >= FTS_ROOTLEVEL; t = t->fts_parent) { struct Active_dir ad; ad.ino = t->fts_statp->st_ino; ad.dev = t->fts_statp->st_dev; if ( ! hash_lookup (sp->fts_cycle.ht, &ad)) printf ("ERROR: active dir, %s, not in tree\n", t->fts_path); } /* Make sure every dir in the tree is an active dir. But ENT is not necessarily a directory. If so, just skip this part. */ if (ent->fts_parent->fts_level >= FTS_ROOTLEVEL && (ent->fts_info == FTS_DP || ent->fts_info == FTS_D)) { struct Active_dir *ad; for (ad = hash_get_first (sp->fts_cycle.ht); ad != NULL; ad = hash_get_next (sp->fts_cycle.ht, ad)) { find_matching_ancestor (ent, ad); } } } #endif static unsigned short int internal_function fts_stat(FTS *sp, register FTSENT *p, bool follow) { struct stat *sbp = p->fts_statp; int saved_errno; #if defined FTS_WHITEOUT && 0 /* check for whiteout */ if (p->fts_flags & FTS_ISW) { 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 (errno == ENOENT && lstat(p->fts_accpath, sbp) == 0) { __set_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(struct stat)); return (FTS_NS); } if (S_ISDIR(sbp->st_mode)) { if (ISDOT(p->fts_name)) return (FTS_DOT); #if _LGPL_PACKAGE { /* * 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. */ FTSENT *t; for (t = p->fts_parent; t->fts_level >= FTS_ROOTLEVEL; t = t->fts_parent) if (sbp->st_ino == t->fts_statp->st_ino && sbp->st_dev == t->fts_statp->st_dev) { p->fts_cycle = t; return (FTS_DC); } } #endif 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 int fts_compar (void const *a, void const *b) { /* Convert A and B to the correct types, to pacify the compiler, and for portability to bizarre hosts where "void const *" and "FTSENT const **" differ in runtime representation. The comparison function cannot modify *a and *b, but there is no compile-time check for this. */ FTSENT const **pa = (FTSENT const **) a; FTSENT const **pb = (FTSENT const **) b; return pa[0]->fts_fts->fts_compar (pa, pb); } static FTSENT * internal_function fts_sort (FTS *sp, FTSENT *head, register size_t nitems) { register FTSENT **ap, *p; /* On most modern hosts, void * and FTSENT ** have the same run-time representation, and one can convert sp->fts_compar to the type qsort expects without problem. Use the heuristic that this is OK if the two pointer types are the same size, and if converting FTSENT ** to long int is the same as converting FTSENT ** to void * and then to long int. This heuristic isn't valid in general but we don't know of any counterexamples. */ FTSENT *dummy; int (*compare) (void const *, void const *) = ((sizeof &dummy == sizeof (void *) && (long int) &dummy == (long int) (void *) &dummy) ? (int (*) (void const *, void const *)) sp->fts_compar : fts_compar); /* * 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) { struct _ftsent **a; sp->fts_nitems = nitems + 40; if (SIZE_MAX / sizeof *a < sp->fts_nitems || ! (a = realloc (sp->fts_array, sp->fts_nitems * sizeof *a))) { free(sp->fts_array); sp->fts_array = NULL; sp->fts_nitems = 0; return (head); } sp->fts_array = a; } for (ap = sp->fts_array, p = head; p; p = p->fts_link) *ap++ = p; qsort((void *)sp->fts_array, nitems, sizeof(FTSENT *), compare); for (head = *(ap = sp->fts_array); --nitems; ++ap) ap[0]->fts_link = ap[1]; ap[0]->fts_link = NULL; return (head); } static FTSENT * internal_function fts_alloc (FTS *sp, const char *name, register size_t namelen) { register FTSENT *p; size_t len; /* * The file name is a variable length array. Allocate the FTSENT * structure and the file name in one chunk. */ len = sizeof(FTSENT) + namelen; if ((p = malloc(len)) == NULL) return (NULL); /* Copy the name and guarantee NUL termination. */ memmove(p->fts_name, name, namelen); p->fts_name[namelen] = '\0'; p->fts_namelen = namelen; p->fts_fts = sp; 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 internal_function fts_lfree (register FTSENT *head) { register FTSENT *p; /* Free a linked list of structures. */ while ((p = head)) { head = head->fts_link; free(p); } } /* * Allow essentially unlimited file name lengths; find, rm, ls should * all work on any tree. Most systems will allow creation of file * names much longer than MAXPATHLEN, even though the kernel won't * resolve them. Add the size (not just what's needed) plus 256 bytes * so don't realloc the file name 2 bytes at a time. */ static bool internal_function fts_palloc (FTS *sp, size_t more) { char *p; size_t new_len = sp->fts_pathlen + more + 256; /* * See if fts_pathlen would overflow. */ if (new_len < sp->fts_pathlen) { if (sp->fts_path) { free(sp->fts_path); sp->fts_path = NULL; } sp->fts_path = NULL; __set_errno (ENAMETOOLONG); return false; } sp->fts_pathlen = new_len; p = realloc(sp->fts_path, sp->fts_pathlen); if (p == NULL) { free(sp->fts_path); sp->fts_path = NULL; return false; } sp->fts_path = p; return true; } /* * When the file name is realloc'd, have to fix all of the pointers in * structures already returned. */ static void internal_function fts_padjust (FTS *sp, FTSENT *head) { FTSENT *p; char *addr = sp->fts_path; #define ADJUST(p) do { \ if ((p)->fts_accpath != (p)->fts_name) { \ (p)->fts_accpath = \ (char *)addr + ((p)->fts_accpath - (p)->fts_path); \ } \ (p)->fts_path = addr; \ } while (0) /* 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 internal_function fts_maxarglen (char * const *argv) { size_t len, max; for (max = 0; *argv; ++argv) if ((len = strlen(*argv)) > max) max = len; return (max + 1); } /* * Change to dir specified by fd or file name without getting * tricked by someone changing the world out from underneath us. * Assumes p->fts_statp->st_dev and p->fts_statp->st_ino are filled in. */ static int internal_function fts_safe_changedir (FTS *sp, FTSENT *p, int fd, char const *dir) { int ret, oerrno, newfd; struct stat sb; newfd = fd; if (ISSET(FTS_NOCHDIR)) return (0); if (fd < 0 && (newfd = diropen (dir)) < 0) return (-1); if (fstat(newfd, &sb)) { ret = -1; goto bail; } if (p->fts_statp->st_dev != sb.st_dev || p->fts_statp->st_ino != sb.st_ino) { __set_errno (ENOENT); /* disinformation */ ret = -1; goto bail; } ret = fchdir(newfd); bail: oerrno = errno; if (fd < 0) (void)close(newfd); __set_errno (oerrno); return (ret); }