_seekdir.c

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/*      seekdir()                                       Author: Kees J. Bot
 *                                                              24 Apr 1989
 */
#define nil 0
#include <lib.h>
#define lseek   _lseek
#define readdir _readdir
#define seekdir _seekdir
#include <sys/types.h>
#include <dirent.h>
#include <unistd.h>
#include <errno.h>

int seekdir(DIR *dp, off_t pos)
/* Seek to position pos in a directory. */
{
        int off;

        if (dp == nil) { errno= EBADF; return -1; }

        dp->_count= 0;
        dp->_ptr= dp->_buf;

        off= pos & (sizeof(dp->_buf) - 1);
        dp->_pos= pos - off;

        if (lseek(dp->_fd, dp->_pos, SEEK_SET) == -1) return -1;

        while (dp->_pos < pos && readdir(dp) != nil) {}

        return 0;
}

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