1f3f50de6SPedro F. Giffuni /* $NetBSD: queue.c,v 1.5 2011/08/31 16:24:57 plunky Exp $ */ 2b66a823bSGabor Kovesdan /* $FreeBSD$ */ 3b66a823bSGabor Kovesdan 44dc88ebeSGabor Kovesdan /*- 51de7b4b8SPedro F. Giffuni * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 61de7b4b8SPedro F. Giffuni * 7a0ef9ad6SDag-Erling Smørgrav * Copyright (c) 1999 James Howard and Dag-Erling Coïdan Smørgrav 84dc88ebeSGabor Kovesdan * All rights reserved. 9*df546c3bSKyle Evans * Copyright (c) 2020 Kyle Evans <kevans@FreeBSD.org> 104dc88ebeSGabor Kovesdan * 114dc88ebeSGabor Kovesdan * Redistribution and use in source and binary forms, with or without 124dc88ebeSGabor Kovesdan * modification, are permitted provided that the following conditions 134dc88ebeSGabor Kovesdan * are met: 144dc88ebeSGabor Kovesdan * 1. Redistributions of source code must retain the above copyright 154dc88ebeSGabor Kovesdan * notice, this list of conditions and the following disclaimer. 164dc88ebeSGabor Kovesdan * 2. Redistributions in binary form must reproduce the above copyright 174dc88ebeSGabor Kovesdan * notice, this list of conditions and the following disclaimer in the 184dc88ebeSGabor Kovesdan * documentation and/or other materials provided with the distribution. 194dc88ebeSGabor Kovesdan * 204dc88ebeSGabor Kovesdan * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 214dc88ebeSGabor Kovesdan * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 224dc88ebeSGabor Kovesdan * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 234dc88ebeSGabor Kovesdan * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 244dc88ebeSGabor Kovesdan * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 254dc88ebeSGabor Kovesdan * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 264dc88ebeSGabor Kovesdan * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 274dc88ebeSGabor Kovesdan * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 284dc88ebeSGabor Kovesdan * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 294dc88ebeSGabor Kovesdan * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 304dc88ebeSGabor Kovesdan * SUCH DAMAGE. 314dc88ebeSGabor Kovesdan */ 324dc88ebeSGabor Kovesdan 334dc88ebeSGabor Kovesdan /* 344dc88ebeSGabor Kovesdan * A really poor man's queue. It does only what it has to and gets out of 354dc88ebeSGabor Kovesdan * Dodge. It is used in place of <sys/queue.h> to get a better performance. 364dc88ebeSGabor Kovesdan */ 374dc88ebeSGabor Kovesdan 384dc88ebeSGabor Kovesdan #include <sys/cdefs.h> 394dc88ebeSGabor Kovesdan __FBSDID("$FreeBSD$"); 404dc88ebeSGabor Kovesdan 414dc88ebeSGabor Kovesdan #include <sys/param.h> 424dc88ebeSGabor Kovesdan #include <sys/queue.h> 434dc88ebeSGabor Kovesdan 444dc88ebeSGabor Kovesdan #include <stdlib.h> 454dc88ebeSGabor Kovesdan #include <string.h> 464dc88ebeSGabor Kovesdan 474dc88ebeSGabor Kovesdan #include "grep.h" 484dc88ebeSGabor Kovesdan 49*df546c3bSKyle Evans typedef struct str qentry_t; 504dc88ebeSGabor Kovesdan 51*df546c3bSKyle Evans static long long filled; 52*df546c3bSKyle Evans static qentry_t *qend, *qpool; 534dc88ebeSGabor Kovesdan 54*df546c3bSKyle Evans /* 55*df546c3bSKyle Evans * qnext is the next entry to populate. qlist is where the list actually 56*df546c3bSKyle Evans * starts, for the purposes of printing. 57*df546c3bSKyle Evans */ 58*df546c3bSKyle Evans static qentry_t *qlist, *qnext; 59*df546c3bSKyle Evans 60*df546c3bSKyle Evans void 61*df546c3bSKyle Evans initqueue(void) 62*df546c3bSKyle Evans { 63*df546c3bSKyle Evans 64*df546c3bSKyle Evans qlist = qnext = qpool = grep_calloc(Bflag, sizeof(*qpool)); 65*df546c3bSKyle Evans qend = qpool + (Bflag - 1); 66*df546c3bSKyle Evans } 67*df546c3bSKyle Evans 68*df546c3bSKyle Evans static qentry_t * 69*df546c3bSKyle Evans advqueue(qentry_t *itemp) 70*df546c3bSKyle Evans { 71*df546c3bSKyle Evans 72*df546c3bSKyle Evans if (itemp == qend) 73*df546c3bSKyle Evans return (qpool); 74*df546c3bSKyle Evans return (itemp + 1); 75*df546c3bSKyle Evans } 764dc88ebeSGabor Kovesdan 77a4f3f02bSEd Maste /* 78a4f3f02bSEd Maste * Enqueue another line; return true if we've dequeued a line as a result 79a4f3f02bSEd Maste */ 80a4f3f02bSEd Maste bool 814dc88ebeSGabor Kovesdan enqueue(struct str *x) 824dc88ebeSGabor Kovesdan { 83*df546c3bSKyle Evans qentry_t *item; 84*df546c3bSKyle Evans bool rotated; 854dc88ebeSGabor Kovesdan 86*df546c3bSKyle Evans item = qnext; 87*df546c3bSKyle Evans qnext = advqueue(qnext); 88*df546c3bSKyle Evans rotated = false; 894dc88ebeSGabor Kovesdan 90*df546c3bSKyle Evans if (filled < Bflag) { 91*df546c3bSKyle Evans filled++; 92*df546c3bSKyle Evans } else if (filled == Bflag) { 93*df546c3bSKyle Evans /* We had already filled up coming in; just rotate. */ 94*df546c3bSKyle Evans qlist = advqueue(qlist); 95*df546c3bSKyle Evans rotated = true; 96*df546c3bSKyle Evans free(item->dat); 97f3f50de6SPedro F. Giffuni } 98*df546c3bSKyle Evans item->dat = grep_malloc(sizeof(char) * x->len); 99*df546c3bSKyle Evans item->len = x->len; 100*df546c3bSKyle Evans item->line_no = x->line_no; 101*df546c3bSKyle Evans item->boff = x->boff; 102*df546c3bSKyle Evans item->off = x->off; 103*df546c3bSKyle Evans memcpy(item->dat, x->dat, x->len); 104*df546c3bSKyle Evans item->file = x->file; 1054dc88ebeSGabor Kovesdan 106*df546c3bSKyle Evans return (rotated); 1074dc88ebeSGabor Kovesdan } 1084dc88ebeSGabor Kovesdan 1094dc88ebeSGabor Kovesdan void 1104dc88ebeSGabor Kovesdan printqueue(void) 1114dc88ebeSGabor Kovesdan { 112*df546c3bSKyle Evans qentry_t *item; 1134dc88ebeSGabor Kovesdan 114*df546c3bSKyle Evans item = qlist; 115*df546c3bSKyle Evans do { 116*df546c3bSKyle Evans /* Buffer must have ended early. */ 117*df546c3bSKyle Evans if (item->dat == NULL) 118*df546c3bSKyle Evans break; 119*df546c3bSKyle Evans 120*df546c3bSKyle Evans grep_printline(item, '-'); 121*df546c3bSKyle Evans free(item->dat); 122*df546c3bSKyle Evans item->dat = NULL; 123*df546c3bSKyle Evans item = advqueue(item); 124*df546c3bSKyle Evans } while (item != qlist); 125*df546c3bSKyle Evans 126*df546c3bSKyle Evans qlist = qnext = qpool; 127*df546c3bSKyle Evans filled = 0; 1284dc88ebeSGabor Kovesdan } 1294dc88ebeSGabor Kovesdan 1304dc88ebeSGabor Kovesdan void 1314dc88ebeSGabor Kovesdan clearqueue(void) 1324dc88ebeSGabor Kovesdan { 133*df546c3bSKyle Evans qentry_t *item; 1344dc88ebeSGabor Kovesdan 135*df546c3bSKyle Evans item = qlist; 136*df546c3bSKyle Evans do { 137*df546c3bSKyle Evans free(item->dat); 138*df546c3bSKyle Evans item->dat = NULL; 139*df546c3bSKyle Evans item = advqueue(item); 140*df546c3bSKyle Evans } while (item != qlist); 141*df546c3bSKyle Evans 142*df546c3bSKyle Evans qlist = qnext = qpool; 143*df546c3bSKyle Evans filled = 0; 144f3f50de6SPedro F. Giffuni } 145