114 lines
2.8 KiB
C
114 lines
2.8 KiB
C
/* $NetBSD: queue.c,v 1.5 2011/08/31 16:24:57 plunky Exp $ */
|
|
/* $FreeBSD$ */
|
|
|
|
/*-
|
|
* 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#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);
|
|
}
|
|
}
|