usr/src/lib/libc/gen/readdir.c

#ifndef lint
static char sccsid[] = "@(#)readdir.c   4.5 (Berkeley) 7/1/83";
#endif

#include <sys/param.h>
#include <sys/dir.h>

/*
 * get next entry in a directory.
 */
struct direct *
readdir(dirp)
        register DIR *dirp;
{
        register struct direct *dp;

        for (;;) {
                if (dirp->dd_loc == 0) {
                        dirp->dd_size = read(dirp->dd_fd, dirp->dd_buf,
                            DIRBLKSIZ);
                        if (dirp->dd_size <= 0)
                                return NULL;
                }
                if (dirp->dd_loc >= dirp->dd_size) {
                        dirp->dd_loc = 0;
                        continue;
                }
                dp = (struct direct *)(dirp->dd_buf + dirp->dd_loc);
                if (dp->d_reclen <= 0 ||
                    dp->d_reclen > DIRBLKSIZ + 1 - dirp->dd_loc)
                        return NULL;
                dirp->dd_loc += dp->d_reclen;
                if (dp->d_ino == 0)
                        continue;
                return (dp);
        }
}