text: /*
   * Copyright (C) 2004-2005 Kay Sievers <kay.sievers@vrfy.org>
   *
   *	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 version 2 of the License.
   * 
   *	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.
   *
   */
  
  
  #include <stdlib.h>
  #include <stdio.h>
  #include <stddef.h>
  #include <unistd.h>
  #include <fcntl.h>
  #include <errno.h>
  #include <ctype.h>
  #include <dirent.h>
  #include <sys/stat.h>
  #include <sys/mman.h>
  
  #include "udev.h"
  
  int create_path(const char *path)
  {
  	char p[PATH_SIZE];
  	char *pos;
  	struct stat stats;
  
  	strlcpy(p, path, sizeof(p));
  	pos = strrchr(p, '/');
  	if (pos == p || pos == NULL)
  		return 0;
  
  	while (pos[-1] == '/')
  		pos--;
  	pos[0] = '\0';
  
  	dbg("stat '%s'", p);
  	if (stat(p, &stats) == 0 && (stats.st_mode & S_IFMT) == S_IFDIR)
  		return 0;
  
  	if (create_path (p) != 0)
  		return -1;
  
  	dbg("mkdir '%s'", p);
  	if (mkdir(p, 0755) == 0)
  		return 0;
  	if (errno == EEXIST)
  		if (stat(p, &stats) == 0 && (stats.st_mode & S_IFMT) == S_IFDIR)
  			return 0;
  	return -1;
  }
  
  int delete_path(const char *path)
  {
  	char p[PATH_SIZE];
  	char *pos;
  	int retval;
  
  	strcpy (p, path);
  	pos = strrchr(p, '/');
  	if (pos == p || pos == NULL)
  		return 0;
  
  	while (1) {
  		*pos = '\0';
  		pos = strrchr(p, '/');
  
  		/* don't remove the last one */
  		if ((pos == p) || (pos == NULL))
  			break;
  
  		/* remove if empty */
  		retval = rmdir(p);
  		if (errno == ENOENT)
  			retval = 0;
  		if (retval) {
  			if (errno == ENOTEMPTY)
  				return 0;
  			err("rmdir(%s) failed: %s", p, strerror(errno));
  			break;
  		}
  		dbg("removed '%s'", p);
  	}
  	return 0;
  }
  
  /* Reset permissions on the device node, before unlinking it to make sure,
   * that permisions of possible hard links will be removed too.
   */
  int unlink_secure(const char *filename)
  {
  	int retval;
  
  	retval = chown(filename, 0, 0);
  	if (retval)
  		err("chown(%s, 0, 0) failed: %s", filename, strerror(errno));
  
  	retval = chmod(filename, 0000);
  	if (retval)
  		err("chmod(%s, 0000) failed: %s", filename, strerror(errno));
  
  	retval = unlink(filename);
  	if (errno == ENOENT)
  		retval = 0;
  
  	if (retval)
  		err("unlink(%s) failed: %s", filename, strerror(errno));
  
  	return retval;
  }
  
  int file_map(const char *filename, char **buf, size_t *bufsize)
  {
  	struct stat stats;
  	int fd;
  
  	fd = open(filename, O_RDONLY);
  	if (fd < 0) {
  		return -1;
  	}
  
  	if (fstat(fd, &stats) < 0) {
  		close(fd);
  		return -1;
  	}
  
  	*buf = mmap(NULL, stats.st_size, PROT_READ, MAP_SHARED, fd, 0);
  	if (*buf == MAP_FAILED) {
  		close(fd);
  		return -1;
  	}
  	*bufsize = stats.st_size;
  
  	close(fd);
  
  	return 0;
  }
  
  void file_unmap(void *buf, size_t bufsize)
  {
  	munmap(buf, bufsize);
  }
  
  /* return number of chars until the next newline, skip escaped newline */
  size_t buf_get_line(const char *buf, size_t buflen, size_t cur)
  {
  	int escape = 0;
  	size_t count;
  
  	for (count = cur; count < buflen; count++) {
  		if (!escape && buf[count] == '\n')
  			break;
  
  		if (buf[count] == '\\')
  			escape = 1;
  		else
  			escape = 0;
  	}
  
  	return count - cur;
  }
  