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- /* $NetBSD: queue.c,v 1.5 2011/08/31 16:24:57 plunky Exp $ */
- /* $FreeBSD: head/usr.bin/grep/queue.c 211496 2010-08-19 09:28:59Z des $ */
- /*-
- * Copyright (c) 1999 James Howard and Dag-Erling Coïdan Smørgrav
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- /*
- * A really poor man's queue. It does only what it has to and gets out of
- * Dodge. It is used in place of <sys/queue.h> to get a better performance.
- */
- #if HAVE_NBTOOL_CONFIG_H
- #include "nbtool_config.h"
- #endif
- #include <sys/cdefs.h>
- __RCSID("$NetBSD: queue.c,v 1.5 2011/08/31 16:24:57 plunky Exp $");
- #include <sys/param.h>
- #include <sys/queue.h>
- #include <stdlib.h>
- #include <string.h>
- #include "grep.h"
- struct qentry {
- STAILQ_ENTRY(qentry) list;
- struct str data;
- };
- static STAILQ_HEAD(, qentry) queue = STAILQ_HEAD_INITIALIZER(queue);
- static unsigned long long count;
- static struct qentry *dequeue(void);
- void
- enqueue(struct str *x)
- {
- struct qentry *item;
- item = grep_malloc(sizeof(struct qentry));
- item->data.dat = grep_malloc(sizeof(char) * x->len);
- item->data.len = x->len;
- item->data.line_no = x->line_no;
- item->data.off = x->off;
- memcpy(item->data.dat, x->dat, x->len);
- item->data.file = x->file;
- STAILQ_INSERT_TAIL(&queue, item, list);
- if (++count > Bflag) {
- item = dequeue();
- free(item->data.dat);
- free(item);
- }
- }
- static struct qentry *
- dequeue(void)
- {
- struct qentry *item;
- item = STAILQ_FIRST(&queue);
- if (item == NULL)
- return (NULL);
- STAILQ_REMOVE_HEAD(&queue, list);
- --count;
- return (item);
- }
- void
- printqueue(void)
- {
- struct qentry *item;
- while ((item = dequeue()) != NULL) {
- printline(&item->data, '-', NULL, 0);
- free(item->data.dat);
- free(item);
- }
- }
- void
- clearqueue(void)
- {
- struct qentry *item;
- while ((item = dequeue()) != NULL) {
- free(item->data.dat);
- free(item);
- }
- }
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