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