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Diffstat (limited to 'newlib/libc/sys/linux/ftw.c')
| -rw-r--r-- | newlib/libc/sys/linux/ftw.c | 640 |
1 files changed, 0 insertions, 640 deletions
diff --git a/newlib/libc/sys/linux/ftw.c b/newlib/libc/sys/linux/ftw.c deleted file mode 100644 index a7f7259bc..000000000 --- a/newlib/libc/sys/linux/ftw.c +++ /dev/null @@ -1,640 +0,0 @@ -/* File tree walker functions. - Copyright (C) 1996,1997,1998,1999,2000,2001 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library 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 - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, write to the Free - Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA - 02111-1307 USA. */ - -/* Modified for newlib by Jeff Johnston, July 26, 2002 */ - -#define _GNU_SOURCE 1 - -#include <dirent.h> -#include <errno.h> -#include <ftw.h> -#include <search.h> -#include <stdlib.h> -#include <string.h> -#include <unistd.h> -#include <sys/param.h> -#include <sys/stat.h> - -extern struct dirent64 *__readdir64 (DIR *); - -/* #define NDEBUG 1 */ -#include <assert.h> - -/* Support for the LFS API version. */ -#ifndef FTW_NAME -# define FTW_NAME ftw -# define NFTW_NAME nftw -# define INO_T ino_t -# define STAT stat -# define LXSTAT lstat -# define XSTAT stat -# define FTW_FUNC_T __ftw_func_t -# define NFTW_FUNC_T __nftw_func_t -#endif - -#define dirfd(x) ((x)->dd_fd) - -struct dir_data -{ - DIR *stream; - char *content; -}; - -struct known_object -{ - dev_t dev; - INO_T ino; -}; - -struct ftw_data -{ - /* Array with pointers to open directory streams. */ - struct dir_data **dirstreams; - size_t actdir; - size_t maxdir; - - /* Buffer containing name of currently processed object. */ - char *dirbuf; - size_t dirbufsize; - - /* Passed as fourth argument to `nftw' callback. The `base' member - tracks the content of the `dirbuf'. */ - struct FTW ftw; - - /* Flags passed to `nftw' function. 0 for `ftw'. */ - int flags; - - /* Conversion array for flag values. It is the identity mapping for - `nftw' calls, otherwise it maps the values to those know by - `ftw'. */ - const int *cvt_arr; - - /* Callback function. We always use the `nftw' form. */ - NFTW_FUNC_T func; - - /* Device of starting point. Needed for FTW_MOUNT. */ - dev_t dev; - - /* Data structure for keeping fingerprints of already processed - object. This is needed when not using FTW_PHYS. */ - void *known_objects; -}; - - -/* Internally we use the FTW_* constants used for `nftw'. When the - process called `ftw' we must reduce the flag to the known flags - for `ftw'. */ -static const int nftw_arr[] = -{ - FTW_F, FTW_D, FTW_DNR, FTW_NS, FTW_SL, FTW_DP, FTW_SLN -}; - -static const int ftw_arr[] = -{ - FTW_F, FTW_D, FTW_DNR, FTW_NS, FTW_F, FTW_D, FTW_NS -}; - - -/* Forward declarations of local functions. */ -static int ftw_dir (struct ftw_data *data, struct STAT *st); - - -static int -object_compare (const void *p1, const void *p2) -{ - /* We don't need a sophisticated and useful comparison. We are only - interested in equality. However, we must be careful not to - accidentally compare `holes' in the structure. */ - const struct known_object *kp1 = p1, *kp2 = p2; - int cmp1; - cmp1 = (kp1->dev > kp2->dev) - (kp1->dev < kp2->dev); - if (cmp1 != 0) - return cmp1; - return (kp1->ino > kp2->ino) - (kp1->ino < kp2->ino); -} - - -static inline int -add_object (struct ftw_data *data, struct STAT *st) -{ - struct known_object *newp = malloc (sizeof (struct known_object)); - if (newp == NULL) - return -1; - newp->dev = st->st_dev; - newp->ino = st->st_ino; - return tsearch (newp, &data->known_objects, object_compare) ? 0 : -1; -} - - -static inline int -find_object (struct ftw_data *data, struct STAT *st) -{ - struct known_object obj = { dev: st->st_dev, ino: st->st_ino }; - return tfind (&obj, &data->known_objects, object_compare) != NULL; -} - - -static inline int -open_dir_stream (struct ftw_data *data, struct dir_data *dirp) -{ - int result = 0; - - if (data->dirstreams[data->actdir] != NULL) - { - /* Oh, oh. We must close this stream. Get all remaining - entries and store them as a list in the `content' member of - the `struct dir_data' variable. */ - size_t bufsize = 1024; - char *buf = malloc (bufsize); - - if (buf == NULL) - result = -1; - else - { - DIR *st = data->dirstreams[data->actdir]->stream; - struct dirent64 *d; - size_t actsize = 0; - - while ((d = __readdir64 (st)) != NULL) - { - size_t this_len = strlen (d->d_name); - if (actsize + this_len + 2 >= bufsize) - { - char *newp; - bufsize += MAX (1024, 2 * this_len); - newp = realloc (buf, bufsize); - if (newp == NULL) - { - /* No more memory. */ - int save_err = errno; - free (buf); - __set_errno (save_err); - result = -1; - break; - } - buf = newp; - } - - *((char *) mempcpy (buf + actsize, d->d_name, this_len)) - = '\0'; - actsize += this_len + 1; - } - - /* Terminate the list with an additional NUL byte. */ - buf[actsize++] = '\0'; - - /* Shrink the buffer to what we actually need. */ - data->dirstreams[data->actdir]->content = realloc (buf, actsize); - if (data->dirstreams[data->actdir]->content == NULL) - { - int save_err = errno; - free (buf); - __set_errno (save_err); - result = -1; - } - else - { - closedir (st); - data->dirstreams[data->actdir]->stream = NULL; - data->dirstreams[data->actdir] = NULL; - } - } - } - - /* Open the new stream. */ - if (result == 0) - { - assert (data->dirstreams[data->actdir] == NULL); - - dirp->stream = opendir (data->dirbuf); - if (dirp->stream == NULL) - result = -1; - else - { - dirp->content = NULL; - data->dirstreams[data->actdir] = dirp; - - if (++data->actdir == data->maxdir) - data->actdir = 0; - } - } - - return result; -} - - -static inline int -process_entry (struct ftw_data *data, struct dir_data *dir, const char *name, - size_t namlen) -{ - struct STAT st; - int result = 0; - int flag = 0; - - if (name[0] == '.' && (name[1] == '\0' - || (name[1] == '.' && name[2] == '\0'))) - /* Don't process the "." and ".." entries. */ - return 0; - - if (data->dirbufsize < data->ftw.base + namlen + 2) - { - /* Enlarge the buffer. */ - char *newp; - - data->dirbufsize *= 2; - newp = realloc (data->dirbuf, data->dirbufsize); - if (newp == NULL) - return -1; - data->dirbuf = newp; - } - - *((char *) mempcpy (data->dirbuf + data->ftw.base, name, namlen)) = '\0'; - - if (((data->flags & FTW_PHYS) - ? LXSTAT (data->dirbuf, &st) - : XSTAT (data->dirbuf, &st)) < 0) - { - if (errno != EACCES && errno != ENOENT) - result = -1; - else if (!(data->flags & FTW_PHYS) - && LXSTAT (data->dirbuf, &st) == 0 - && S_ISLNK (st.st_mode)) - flag = FTW_SLN; - else - flag = FTW_NS; - } - else - { - if (S_ISDIR (st.st_mode)) - flag = FTW_D; - else if (S_ISLNK (st.st_mode)) - flag = FTW_SL; - else - flag = FTW_F; - } - - if (result == 0 - && (flag == FTW_NS - || !(data->flags & FTW_MOUNT) || st.st_dev == data->dev)) - { - if (flag == FTW_D) - { - if ((data->flags & FTW_PHYS) - || (!find_object (data, &st) - /* Remember the object. */ - && (result = add_object (data, &st)) == 0)) - { - result = ftw_dir (data, &st); - - if (result == 0 && (data->flags & FTW_CHDIR)) - { - /* Change back to current directory. */ - int done = 0; - if (dir->stream != NULL) - if (fchdir (dirfd (dir->stream)) == 0) - done = 1; - - if (!done) - { - if (data->ftw.base == 1) - { - if (chdir ("/") < 0) - result = -1; - } - else - { - /* Please note that we overwrite a slash. */ - data->dirbuf[data->ftw.base - 1] = '\0'; - - if (chdir (data->dirbuf) < 0) - result = -1; - - data->dirbuf[data->ftw.base - 1] = '/'; - } - } - } - } - } - else - result = (*data->func) (data->dirbuf, &st, data->cvt_arr[flag], - &data->ftw); - } - - return result; -} - - -static int -ftw_dir (struct ftw_data *data, struct STAT *st) -{ - struct dir_data dir; - struct dirent64 *d; - int previous_base = data->ftw.base; - int result; - char *startp; - - /* Open the stream for this directory. This might require that - another stream has to be closed. */ - result = open_dir_stream (data, &dir); - if (result != 0) - { - if (errno == EACCES) - /* We cannot read the directory. Signal this with a special flag. */ - result = (*data->func) (data->dirbuf, st, FTW_DNR, &data->ftw); - - return result; - } - - /* First, report the directory (if not depth-first). */ - if (!(data->flags & FTW_DEPTH)) - { - result = (*data->func) (data->dirbuf, st, FTW_D, &data->ftw); - if (result != 0) - return result; - } - - /* If necessary, change to this directory. */ - if (data->flags & FTW_CHDIR) - { - if (fchdir (dirfd (dir.stream)) < 0) - { - if (errno == ENOSYS) - { - if (chdir (data->dirbuf) < 0) - result = -1; - } - else - result = -1; - } - - if (result != 0) - { - int save_err = errno; - closedir (dir.stream); - __set_errno (save_err); - - if (data->actdir-- == 0) - data->actdir = data->maxdir - 1; - data->dirstreams[data->actdir] = NULL; - - return result; - } - } - - /* Next, update the `struct FTW' information. */ - ++data->ftw.level; - startp = strchr (data->dirbuf, '\0'); - /* There always must be a directory name. */ - assert (startp != data->dirbuf); - if (startp[-1] != '/') - *startp++ = '/'; - data->ftw.base = startp - data->dirbuf; - - while (dir.stream != NULL && (d = __readdir64 (dir.stream)) != NULL) - { - result = process_entry (data, &dir, d->d_name, strlen (d->d_name)); - if (result != 0) - break; - } - - if (dir.stream != NULL) - { - /* The stream is still open. I.e., we did not need more - descriptors. Simply close the stream now. */ - int save_err = errno; - - assert (dir.content == NULL); - - closedir (dir.stream); - __set_errno (save_err); - - if (data->actdir-- == 0) - data->actdir = data->maxdir - 1; - data->dirstreams[data->actdir] = NULL; - } - else - { - int save_err; - char *runp = dir.content; - - while (result == 0 && *runp != '\0') - { - char *endp = strchr (runp, '\0'); - - result = process_entry (data, &dir, runp, endp - runp); - - runp = endp + 1; - } - - save_err = errno; - free (dir.content); - __set_errno (save_err); - } - - /* Prepare the return, revert the `struct FTW' information. */ - data->dirbuf[data->ftw.base - 1] = '\0'; - --data->ftw.level; - data->ftw.base = previous_base; - - /* Finally, if we process depth-first report the directory. */ - if (result == 0 && (data->flags & FTW_DEPTH)) - result = (*data->func) (data->dirbuf, st, FTW_DP, &data->ftw); - - return result; -} - - -static int -ftw_startup (const char *dir, int is_nftw, void *func, int descriptors, - int flags) -{ - struct ftw_data data; - struct STAT st; - int result = 0; - int save_err; - int len; - char *cwd = NULL; - char *cp; - - /* First make sure the parameters are reasonable. */ - if (dir[0] == '\0') - { - __set_errno (ENOENT); - return -1; - } - - if (access (dir, R_OK) != 0) - return -1; - - data.maxdir = descriptors < 1 ? 1 : descriptors; - data.actdir = 0; - data.dirstreams = (struct dir_data **) alloca (data.maxdir - * sizeof (struct dir_data *)); - memset (data.dirstreams, '\0', data.maxdir * sizeof (struct dir_data *)); - -#ifdef PATH_MAX - data.dirbufsize = MAX (2 * strlen (dir), PATH_MAX); -#else - data.dirbufsize = 2 * strlen (dir); -#endif - data.dirbuf = (char *) malloc (data.dirbufsize); - if (data.dirbuf == NULL) - return -1; - len = strlen (dir); - cp = mempcpy (data.dirbuf, dir, len); - /* Strip trailing slashes. */ - while (cp > data.dirbuf + 1 && cp[-1] == '/') - --cp; - *cp = '\0'; - - data.ftw.level = 0; - - /* Find basename. */ - while (cp > data.dirbuf && cp[-1] != '/') - --cp; - data.ftw.base = cp - data.dirbuf; - - data.flags = flags; - - /* This assignment might seem to be strange but it is what we want. - The trick is that the first three arguments to the `ftw' and - `nftw' callback functions are equal. Therefore we can call in - every case the callback using the format of the `nftw' version - and get the correct result since the stack layout for a function - call in C allows this. */ - data.func = (NFTW_FUNC_T) func; - - /* Since we internally use the complete set of FTW_* values we need - to reduce the value range before calling a `ftw' callback. */ - data.cvt_arr = is_nftw ? nftw_arr : ftw_arr; - - /* No object known so far. */ - data.known_objects = NULL; - - /* Now go to the directory containing the initial file/directory. */ - if ((flags & FTW_CHDIR) && data.ftw.base > 0) - { - /* GNU extension ahead. */ - cwd = getcwd (NULL, 0); - if (cwd == NULL) - result = -1; - else - { - /* Change to the directory the file is in. In data.dirbuf - we have a writable copy of the file name. Just NUL - terminate it for now and change the directory. */ - if (data.ftw.base == 1) - /* I.e., the file is in the root directory. */ - result = chdir ("/"); - else - { - char ch = data.dirbuf[data.ftw.base - 1]; - data.dirbuf[data.ftw.base - 1] = '\0'; - result = chdir (data.dirbuf); - data.dirbuf[data.ftw.base - 1] = ch; - } - } - } - - /* Get stat info for start directory. */ - if (result == 0) - { - if (((flags & FTW_PHYS) - ? LXSTAT (data.dirbuf, &st) - : XSTAT (data.dirbuf, &st)) < 0) - { - if (errno == EACCES) - result = (*data.func) (data.dirbuf, &st, FTW_NS, &data.ftw); - else if (!(flags & FTW_PHYS) - && errno == ENOENT - && LXSTAT (dir, &st) == 0 - && S_ISLNK (st.st_mode)) - result = (*data.func) (data.dirbuf, &st, data.cvt_arr[FTW_SLN], - &data.ftw); - else - /* No need to call the callback since we cannot say anything - about the object. */ - result = -1; - } - else - { - if (S_ISDIR (st.st_mode)) - { - /* Remember the device of the initial directory in case - FTW_MOUNT is given. */ - data.dev = st.st_dev; - - /* We know this directory now. */ - if (!(flags & FTW_PHYS)) - result = add_object (&data, &st); - - if (result == 0) - result = ftw_dir (&data, &st); - } - else - { - int flag = S_ISLNK (st.st_mode) ? FTW_SL : FTW_F; - - result = (*data.func) (data.dirbuf, &st, data.cvt_arr[flag], - &data.ftw); - } - } - } - - /* Return to the start directory (if necessary). */ - if (cwd != NULL) - { - int save_err = errno; - chdir (cwd); - free (cwd); - __set_errno (save_err); - } - - /* Free all memory. */ - save_err = errno; - tdestroy (data.known_objects, free); - free (data.dirbuf); - __set_errno (save_err); - - return result; -} - - - -/* Entry points. */ - -int -FTW_NAME (path, func, descriptors) - const char *path; - FTW_FUNC_T func; - int descriptors; -{ - return ftw_startup (path, 0, func, descriptors, 0); -} - -int -NFTW_NAME (path, func, descriptors, flags) - const char *path; - NFTW_FUNC_T func; - int descriptors; - int flags; -{ - return ftw_startup (path, 1, func, descriptors, flags); -} |