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/* $OpenBSD: tag.h,v 1.7 2015/11/19 07:53:31 bentley Exp $ */
/*-
* Copyright (c) 1992, 1993, 1994
* The Regents of the University of California. All rights reserved.
* Copyright (c) 1992, 1993, 1994, 1995, 1996
* Keith Bostic. All rights reserved.
* Copyright (c) 1994, 1996
* Rob Mayoff. All rights reserved.
*
* See the LICENSE file for redistribution information.
*
* @(#)tag.h 10.5 (Berkeley) 5/15/96
*/
/*
* Tag file information. One of these is maintained per tag file, linked
* from the EXPRIVATE structure.
*/
struct _tagf { /* Tag files. */
TAILQ_ENTRY(_tagf) q; /* Linked list of tag files. */
char *name; /* Tag file name. */
int errnum; /* Errno. */
#define TAGF_ERR 0x01 /* Error occurred. */
#define TAGF_ERR_WARN 0x02 /* Error reported. */
u_int8_t flags;
};
/*
* Tags are structured internally as follows:
*
* +----+ +----+ +----+ +----+
* | EP | -> | Q1 | <-- | T1 | <-- | T2 |
* +----+ +----+ --> +----+ --> +----+
* |
* +----+ +----+
* | Q2 | <-- | T1 |
* +----+ --> +----+
* |
* +----+ +----+
* | Q3 | <-- | T1 |
* +----+ --> +----+
*
* Each Q is a TAGQ, or tag "query", which is the result of one tag.
* Each Q references one or more TAG's, or tagged file locations.
*
* tag: put a new Q at the head (^])
* tagnext: T1 -> T2 inside Q (^N)
* tagprev: T2 -> T1 inside Q (^P)
* tagpop: discard Q (^T)
* tagtop: discard all Q
*/
struct _tag { /* Tag list. */
TAILQ_ENTRY(_tag) q; /* Linked list of tags. */
/* Tag pop/return information. */
FREF *frp; /* Saved file. */
recno_t lno; /* Saved line number. */
size_t cno; /* Saved column number. */
char *fname; /* Filename. */
size_t fnlen; /* Filename length. */
recno_t slno; /* Search line number. */
char *search; /* Search string. */
size_t slen; /* Search string length. */
char buf[1]; /* Variable length buffer. */
};
struct _tagq { /* Tag queue. */
TAILQ_ENTRY(_tagq) q; /* Linked list of tag queues. */
/* This queue's tag list. */
TAILQ_HEAD(_tagqh, _tag) tagq;
TAG *current; /* Current TAG within the queue. */
char *tag; /* Tag string. */
size_t tlen; /* Tag string length. */
u_int8_t flags;
char buf[1]; /* Variable length buffer. */
};
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