mirror of
https://github.com/netsurf-browser/netsurf
synced 2024-12-11 06:54:00 +03:00
99 lines
2.9 KiB
C
99 lines
2.9 KiB
C
|
/*
|
||
|
|
* This file is part of NetSurf, http://netsurf-browser.org/
|
||
|
|
* Licensed under the GNU General Public License,
|
||
|
|
* http://www.opensource.org/licenses/gpl-license
|
||
|
|
* Copyright 2006, 2007 Daniel Silverstone <dsilvers@digital-scurf.org>
|
||
|
|
*/
|
||
|
|
|
||
|
|
/** \file
|
||
|
|
* Ring list structure.
|
||
|
|
*
|
||
|
|
* Rings are structures which have an r_next pointer and an r_prev
|
||
|
|
* pointer which are always initialised and always point at the next
|
||
|
|
* or previous element respectively.
|
||
|
|
*
|
||
|
|
* The degenerate case of a single element in the ring simply points
|
||
|
|
* at itself in both directions. A zero element ring is NULL.
|
||
|
|
*
|
||
|
|
* Some of the ring functions are specific to the fetcher but may be
|
||
|
|
* of use to others and are thus included here.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef _NETSURF_UTILS_RING_H_
|
||
|
|
#define _NETSURF_UTILS_RING_H_
|
||
|
|
|
||
|
|
|
||
|
|
/** Insert the given item into the specified ring.
|
||
|
|
* Assumes that the element is zeroed as appropriate.
|
||
|
|
*/
|
||
|
|
#define RING_INSERT(ring,element) \
|
||
|
|
/*LOG(("RING_INSERT(%s, %p(%s))", #ring, element, element->host));*/ \
|
||
|
|
if (ring) { \
|
||
|
|
element->r_next = ring; \
|
||
|
|
element->r_prev = ring->r_prev; \
|
||
|
|
ring->r_prev = element; \
|
||
|
|
element->r_prev->r_next = element; \
|
||
|
|
} else \
|
||
|
|
ring = element->r_prev = element->r_next = element
|
||
|
|
|
||
|
|
/** Remove the given element from the specified ring.
|
||
|
|
* Will zero the element as needed
|
||
|
|
*/
|
||
|
|
#define RING_REMOVE(ring, element) \
|
||
|
|
/*LOG(("RING_REMOVE(%s, %p(%s)", #ring, element, element->host));*/ \
|
||
|
|
if (element->r_next != element ) { \
|
||
|
|
/* Not the only thing in the ring */ \
|
||
|
|
element->r_next->r_prev = element->r_prev; \
|
||
|
|
element->r_prev->r_next = element->r_next; \
|
||
|
|
if (ring == element) ring = element->r_next; \
|
||
|
|
} else { \
|
||
|
|
/* Only thing in the ring */ \
|
||
|
|
ring = 0; \
|
||
|
|
} \
|
||
|
|
element->r_next = element->r_prev = 0
|
||
|
|
|
||
|
|
/** Find the element (by hostname) in the given ring, leave it in the
|
||
|
|
* provided element variable
|
||
|
|
*/
|
||
|
|
#define RING_FINDBYHOST(ring, element, hostname) \
|
||
|
|
/*LOG(("RING_FINDBYHOST(%s, %s)", #ring, hostname));*/ \
|
||
|
|
if (ring) { \
|
||
|
|
bool found = false; \
|
||
|
|
element = ring; \
|
||
|
|
do { \
|
||
|
|
if (strcasecmp(element->host, hostname) == 0) { \
|
||
|
|
found = true; \
|
||
|
|
break; \
|
||
|
|
} \
|
||
|
|
element = element->r_next; \
|
||
|
|
} while (element != ring); \
|
||
|
|
if (!found) element = 0; \
|
||
|
|
} else element = 0
|
||
|
|
|
||
|
|
/** Measure the size of a ring and put it in the supplied variable */
|
||
|
|
#define RING_GETSIZE(ringtype, ring, sizevar) \
|
||
|
|
/*LOG(("RING_GETSIZE(%s)", #ring));*/ \
|
||
|
|
if (ring) { \
|
||
|
|
ringtype *p = ring; \
|
||
|
|
sizevar = 0; \
|
||
|
|
do { \
|
||
|
|
sizevar++; \
|
||
|
|
p = p->r_next; \
|
||
|
|
} while (p != ring); \
|
||
|
|
} else sizevar = 0
|
||
|
|
|
||
|
|
/** Count the number of elements in the ring which match the provided hostname */
|
||
|
|
#define RING_COUNTBYHOST(ringtype, ring, sizevar, hostname) \
|
||
|
|
/*LOG(("RING_COUNTBYHOST(%s, %s)", #ring, hostname));*/ \
|
||
|
|
if (ring) { \
|
||
|
|
ringtype *p = ring; \
|
||
|
|
sizevar = 0; \
|
||
|
|
do { \
|
||
|
|
if (strcasecmp(p->host, hostname) == 0) \
|
||
|
|
sizevar++; \
|
||
|
|
p = p->r_next; \
|
||
|
|
} while (p != ring); \
|
||
|
|
} else sizevar = 0
|
||
|
|
|
||
|
|
#endif
|