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- /* Copyright (C) 1992 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Ian Lance Taylor (ian@airs.com).
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public License as
- published by the Free Software Foundation; either version 2 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
- Library General Public License for more details.
-
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If
- not, write to the Free Software Foundation, Inc., 675 Mass Ave,
- Cambridge, MA 02139, USA. */
-
- #include <errno.h>
- #include <limits.h>
- #include <stdlib.h>
- #include <string.h>
- #include <dirent.h>
- #include <sys/types.h>
- #include <sys/stat.h>
- #include "ftw.h"
-
- #define NLENGTH(direct) (strlen((direct)->d_name))
- #define _STYPES
-
- #ifndef PATH_MAX
- #define PATH_MAX 1024 /* XXX */
- #endif
-
-
- /* Traverse one level of a directory tree. */
-
- static int
- ftw_dir (dirs, level, descriptors, dir, len, func)
- DIR **dirs;
- int level;
- int descriptors;
- char *dir;
- size_t len;
- int (*func) ();
- {
- int got;
- struct dirent *entry;
-
- got = 0;
-
- errno = 0;
-
- while ((entry = readdir (dirs[level])) != NULL)
- {
- struct stat s;
- int flag, ret, newlev;
-
- ++got;
-
- if (entry->d_name[0] == '.'
- && (NLENGTH (entry) == 1 ||
- (NLENGTH (entry) == 2 && entry->d_name[1] == '.')))
- {
- errno = 0;
- continue;
- }
-
- if (NLENGTH (entry) + len + 1 > PATH_MAX)
- {
- #ifdef ENAMETOOLONG
- errno = ENAMETOOLONG;
- #else
- errno = ENOMEM;
- #endif
- return -1;
- }
-
- dir[len] = '/';
- memcpy ((void *) (dir + len + 1), (void *) entry->d_name,
- NLENGTH (entry) + 1);
-
- if (stat (dir, &s) < 0)
- {
- #ifndef __amigados__
- if (errno != EACCES)
- return -1;
- #endif
- flag = FTW_NS;
- }
- else if (S_ISDIR (s.st_mode))
- {
- newlev = (level + 1) % descriptors;
-
- if (dirs[newlev] != NULL)
- closedir (dirs[newlev]);
-
- dirs[newlev] = opendir (dir);
- if (dirs[newlev] != NULL)
- flag = FTW_D;
- else
- {
- if (errno != EACCES)
- return -1;
- flag = FTW_DNR;
- }
- }
- else
- flag = FTW_F;
-
- ret = (*func) (dir, &s, flag);
-
- if (flag == FTW_D)
- {
- if (ret == 0)
- ret = ftw_dir (dirs, newlev, descriptors, dir,
- NLENGTH (entry) + len + 1, func);
- if (dirs[newlev] != NULL)
- {
- int save;
-
- save = errno;
- closedir (dirs[newlev]);
- errno = save;
- dirs[newlev] = NULL;
- }
- }
-
- if (ret != 0)
- return ret;
-
- if (dirs[level] == NULL)
- {
- int skip;
-
- dir[len] = '\0';
- dirs[level] = opendir (dir);
- if (dirs[level] == NULL)
- return -1;
- skip = got;
- while (skip-- != 0)
- {
- errno = 0;
- if (readdir (dirs[level]) == NULL)
- return errno == 0 ? 0 : -1;
- }
- }
-
- errno = 0;
- }
-
- return errno == 0 ? 0 : -1;
- }
-
- /* Call a function on every element in a directory tree. */
-
- int
- ftw (dir, func, descriptors)
- const char *dir;
- int (*func) ();
- int descriptors;
- {
- DIR **dirs;
- size_t len;
- char buf[PATH_MAX + 1];
- struct stat s;
- int flag, ret;
- int i;
-
- if (descriptors <= 0)
- descriptors = 1;
-
- dirs = (DIR **) alloca (descriptors * sizeof (DIR *));
- i = descriptors;
- while (i-- > 0)
- dirs[i] = NULL;
-
- if (stat (dir, &s) < 0)
- {
- #ifndef __amigados__
- if (errno != EACCES)
- return -1;
- #endif
- flag = FTW_NS;
- }
- else if (S_ISDIR (s.st_mode))
- {
- dirs[0] = opendir (dir);
- if (dirs[0] != NULL)
- flag = FTW_D;
- else
- {
- if (errno != EACCES)
- return -1;
- flag = FTW_DNR;
- }
- }
- else
- flag = FTW_F;
-
- len = strlen (dir);
- memcpy ((void *) buf, (void *) dir, len + 1);
-
- ret = (*func) (buf, &s, flag);
-
- if (flag == FTW_D)
- {
- if (ret == 0)
- ret = ftw_dir (dirs, 0, descriptors, buf, len, func);
- if (dirs[0] != NULL)
- {
- int save;
-
- save = errno;
- closedir (dirs[0]);
- errno = save;
- }
- }
-
- return ret;
- }
-