less-23/less/ch.c

86 #define	FOR_BUFS_IN_CHAIN(h,bp) \
87 	for (bp = thisfile->hashtbl[h].buf_hnext;  \
88 	     bp != END_OF_HCHAIN(h);  bp = bp->hnext)
90 #define	HASH_RM(bp) \
91 	(bp)->hnext->hprev = (bp)->hprev; \
92 	(bp)->hprev->hnext = (bp)->hnext;
94 #define	HASH_INS(bp,h) \
95 	(bp)->hnext = thisfile->hashtbl[h].buf_hnext; \
96 	(bp)->hprev = END_OF_HCHAIN(h); \
97 	thisfile->hashtbl[h].buf_hnext->hprev = (bp); \
98 	thisfile->hashtbl[h].buf_hnext = (bp);
132 	register struct buf *bp;
148 	FOR_BUFS_IN_CHAIN(h, bp)
150 		if (bp->block == ch_block)
152 			if (ch_offset >= bp->datasize)
183 	bp = ch_buftail;
184 	HASH_RM(bp); /* Remove from old hash chain. */
185 	bp->block = ch_block;
186 	bp->datasize = 0;
187 	HASH_INS(bp, h); /* Insert into new hash chain. */
190 	pos = (ch_block * LBUFSIZE) + bp->datasize;
222 		bp->data[bp->datasize] = ch_ungotchar;
227 		bp->data[bp->datasize] = helpdata[ch_fpos];
231 		n = iread(ch_file, &bp->data[bp->datasize],
232 			(unsigned int)(LBUFSIZE - bp->datasize));
254 		write(logfile, (char *) &bp->data[bp->datasize], n);
258 	bp->datasize += n;
312 	if (ch_bufhead != bp)
318 		bp->next->prev = bp->prev;
319 		bp->prev->next = bp->next;
320 		bp->next = ch_bufhead;
321 		bp->prev = END_OF_CHAIN;
322 		ch_bufhead->prev = bp;
323 		ch_bufhead = bp;
328 		HASH_RM(bp);
329 		HASH_INS(bp, h);
332 	if (ch_offset >= bp->datasize)
339 	return (bp->data[ch_offset]);
388 	register struct buf *bp;
396 		for (bp = ch_bufhead;  ;  bp = bp->next)
398 			if (bp == END_OF_CHAIN)
408 			if (bp->block == block)
410 				write(logfile, (char *) bp->data, bp->datasize);
426 	register struct buf *bp;
430 	FOR_BUFS_IN_CHAIN(h, bp)
432 		if (bp->block == block)
513 	register struct buf *bp, *firstbp;
525 	firstbp = bp = ch_bufhead;
526 	if (bp == END_OF_CHAIN)
528 	while ((bp = bp->next) != END_OF_CHAIN)
529 		if (bp->block < firstbp->block)
530 			firstbp = bp;
631 	register struct buf *bp;
649 	for (bp = ch_bufhead;  bp != END_OF_CHAIN;  bp = bp->next)
650 		bp->block = -1;
696 	register struct buf *bp;
702 	bp = (struct buf *) calloc(1, sizeof(struct buf));
703 	if (bp == NULL)
706 	bp->block = -1;
707 	bp->next = END_OF_CHAIN;
708 	bp->prev = ch_buftail;
709 	ch_buftail->next = bp;
710 	ch_buftail = bp;
711 	HASH_INS(bp, 0);
736 	register struct buf *bp;
740 		bp = ch_bufhead;
741 		bp->next->prev = bp->prev;
742 		bp->prev->next = bp->next;
743 		free(bp);
869 	struct buf *bp;
881 	for (bp = fs->buf_next; bp != (struct buf *)fs;  bp = bp->next)
884 			bp, bp->block, bp->datasize);
885 		for (s = bp->data;  s < bp->data + 30;  s++)