1 files changed, 107 insertions, 0 deletions
diff --git a/usr.bin/grep/queue.c b/usr.bin/grep/queue.c
new file mode 100644
index 0000000..afcb827
--- /dev/null
+++ b/usr.bin/grep/queue.c
@@ -0,0 +1,107 @@
+/*	$NetBSD: queue.c,v 1.2 2011/02/16 01:31:33 joerg 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)
+		free(dequeue());
+}
+
+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, '-', (regmatch_t *)NULL, 0);
+		free(item);
+	}
+}
+
+void
+clearqueue(void)
+{
+	struct qentry *item;
+
+	while ((item = dequeue()) != NULL)
+		free(item);
+}