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Diffstat (limited to 'src/lib/libast/dir/seekdir.c')
| -rw-r--r-- | src/lib/libast/dir/seekdir.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/src/lib/libast/dir/seekdir.c b/src/lib/libast/dir/seekdir.c new file mode 100644 index 0000000..8113584 --- /dev/null +++ b/src/lib/libast/dir/seekdir.c @@ -0,0 +1,56 @@ +/*********************************************************************** +* * +* This software is part of the ast package * +* Copyright (c) 1985-2011 AT&T Intellectual Property * +* and is licensed under the * +* Eclipse Public License, Version 1.0 * +* by AT&T Intellectual Property * +* * +* A copy of the License is available at * +* http://www.eclipse.org/org/documents/epl-v10.html * +* (with md5 checksum b35adb5213ca9657e911e9befb180842) * +* * +* Information and Software Systems Research * +* AT&T Research * +* Florham Park NJ * +* * +* Glenn Fowler <gsf@research.att.com> * +* David Korn <dgk@research.att.com> * +* Phong Vo <kpv@research.att.com> * +* * +***********************************************************************/ +#pragma prototyped + +/* + * seekdir + * + * seek on directory stream + * this is not optimal because there aren't portable + * semantics for directory seeks + */ + +#include "dirlib.h" + +#if _dir_ok + +NoN(seekdir) + +#else + +void +seekdir(register DIR* dirp, long loc) +{ + off_t base; /* file location of block */ + off_t offset; /* offset within block */ + + if (telldir(dirp) != loc) + { + lseek(dirp->dd_fd, 0L, SEEK_SET); + dirp->dd_loc = dirp->dd_size = 0; + while (telldir(dirp) != loc) + if (!readdir(dirp)) + break; /* "can't happen" */ + } +} + +#endif |