IABSD.fr/src/libexec/ld.so/dir.c

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• Author : deraadt
  Date : 2017-12-12 07:47:58
  Hash : 7aa9dd3f
  Message : spacing

• libexec/ld.so/dir.c

• /*	$OpenBSD: dir.c,v 1.24 2017/12/12 07:47:58 deraadt Exp $	*/
  /*
   * Copyright (c) 1983, 1993
   *	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.
   */
  
  #include <sys/types.h>
  #include <sys/stat.h>
  
  #include <dirent.h>
  #include <fcntl.h>
  #include <stdlib.h>
  #include <unistd.h>
  
  #include "syscall.h"
  #include "archdep.h"
  #include "util.h"
  #include "dir.h"
  
  struct _dl_dirdesc {
  	long	dd_loc;		/* offset in current buffer */
  	long	dd_size;	/* amount of data returned by getdents() */
  	char	*dd_buf;	/* data buffer */
  	int	dd_len;		/* size of data buffer */
  	int	dd_fd;		/* file descriptor associated with directory */
  };
  
  /*
   * Open a directory.
   */
  _dl_DIR *
  _dl_opendir(const char *name)
  {
  	_dl_DIR *dirp;
  	int fd;
  	struct stat sb;
  
  	if ((fd = _dl_open(name, O_RDONLY | O_DIRECTORY | O_CLOEXEC)) < 0)
  		return (NULL);
  	if (_dl_fstat(fd, &sb) || (dirp = _dl_malloc(sizeof(*dirp))) == NULL) {
  		_dl_close(fd);
  		return (NULL);
  	}
  
  	dirp->dd_fd = fd;
  	dirp->dd_loc = 0;
  	dirp->dd_size = 0;
  	dirp->dd_len = _dl_round_page(sb.st_blksize);
  	dirp->dd_buf = _dl_malloc(dirp->dd_len);
  	if (dirp->dd_buf == NULL) {
  		_dl_free(dirp);
  		_dl_close(fd);
  		return (NULL);
  	}
  
  	return (dirp);
  }
  
  
  /*
   * close a directory.
   */
  int
  _dl_closedir(_dl_DIR *dirp)
  {
  	int ret;
  
  	ret = _dl_close(dirp->dd_fd);
  	_dl_free(dirp->dd_buf);
  	_dl_free(dirp);
  	return ret;
  }
  
  
  /*
   * get next entry in a directory.
   */
  struct dirent *
  _dl_readdir(_dl_DIR *dirp)
  {
  	struct dirent *dp;
  
  	for (;;) {
  		if (dirp->dd_loc >= dirp->dd_size) {
  			dirp->dd_loc = 0;
  		}
  		if (dirp->dd_loc == 0) {
  			dirp->dd_size = _dl_getdents(dirp->dd_fd,
  			    dirp->dd_buf, dirp->dd_len);
  			if (dirp->dd_size <= 0)
  				return (NULL);
  		}
  		dp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc);
  		if ((long)dp & 03)	/* bogus pointer check */
  			return (NULL);
  		if (dp->d_reclen <= 0 ||
  		    dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc)
  			return (NULL);
  		dirp->dd_loc += dp->d_reclen;
  		if (dp->d_ino == 0)
  			continue;
  		return (dp);
  	}
  }