From 011e7972b55a00035ef01cb1b007db6fd674a3c2 Mon Sep 17 00:00:00 2001
From: Joris Vink <joris@cvs.openbsd.org>
Date: Tue, 9 Aug 2005 10:33:47 +0000
Subject: fix our root caching method, it was utterly broken and would cause
 opencvs to segfault in several cases.

ok jfb@, xsa@
---
 usr.bin/cvs/cvs.h  |  4 +++-
 usr.bin/cvs/root.c | 32 ++++++++++++++------------------
 2 files changed, 17 insertions(+), 19 deletions(-)

diff --git a/usr.bin/cvs/cvs.h b/usr.bin/cvs/cvs.h
index db3eadc6694..6417d02d4f2 100644
--- a/usr.bin/cvs/cvs.h
+++ b/usr.bin/cvs/cvs.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: cvs.h,v 1.77 2005/08/04 13:31:14 xsa Exp $	*/
+/*	$OpenBSD: cvs.h,v 1.78 2005/08/09 10:33:46 joris Exp $	*/
 /*
  * Copyright (c) 2004 Jean-Francois Brousseau <jfb@openbsd.org>
  * All rights reserved.
@@ -213,6 +213,8 @@ struct cvsroot {
 	FILE   *cr_srverr;
 	char   *cr_version;     /* version of remote server */
 	u_char  cr_vrmask[16];  /* mask of valid requests supported by server */
+
+	TAILQ_ENTRY(cvsroot) root_cache;
 };
 
 #define CVS_SETVR(rt, rq) ((rt)->cr_vrmask[(rq) / 8] |=  (1 << ((rq) % 8)))
diff --git a/usr.bin/cvs/root.c b/usr.bin/cvs/root.c
index 9ebda0a9603..f470b4e307a 100644
--- a/usr.bin/cvs/root.c
+++ b/usr.bin/cvs/root.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: root.c,v 1.21 2005/07/25 12:13:08 xsa Exp $	*/
+/*	$OpenBSD: root.c,v 1.22 2005/08/09 10:33:46 joris Exp $	*/
 /*
  * Copyright (c) 2004 Jean-Francois Brousseau <jfb@openbsd.org>
  * All rights reserved.
@@ -65,11 +65,7 @@ const char *cvs_methods[] = {
  * increases the reference count).  Otherwise, it does the parsing and adds
  * the result to the cache for future hits.
  */
-
-static struct cvsroot **cvs_rcache = NULL;
-static u_int cvs_rcsz = 0;
-
-
+static TAILQ_HEAD(, cvsroot) cvs_rcache = TAILQ_HEAD_INITIALIZER(cvs_rcache);
 
 /*
  * cvsroot_parse()
@@ -86,13 +82,18 @@ cvsroot_parse(const char *str)
 {
 	u_int i;
 	char *cp, *sp, *pp;
-	void *tmp;
 	struct cvsroot *root;
 
-	for (i = 0; i < cvs_rcsz; i++) {
-		if (strcmp(str, cvs_rcache[i]->cr_str) == 0) {
-			cvs_rcache[i]->cr_ref++;
-			return (cvs_rcache[i]);
+	/*
+	 * Look if we have it in cache, if we found it add it to the cache
+	 * at the first position again.
+	 */
+	TAILQ_FOREACH(root, &cvs_rcache, root_cache) {
+		if (strcmp(str, root->cr_str) == 0) {
+			TAILQ_REMOVE(&cvs_rcache, root, root_cache);
+			TAILQ_INSERT_HEAD(&cvs_rcache, root, root_cache);
+			root->cr_ref++;
+			return (root);
 		}
 	}
 
@@ -214,13 +215,7 @@ cvsroot_parse(const char *str)
 	}
 
 	/* add to the cache */
-	tmp = realloc(cvs_rcache, (cvs_rcsz + 1) * sizeof(struct cvsroot *));
-	if (tmp != NULL) {
-		cvs_rcache = (struct cvsroot **)tmp;
-		cvs_rcache[cvs_rcsz++] = root;
-		root->cr_ref++;
-	}
-
+	TAILQ_INSERT_HEAD(&cvs_rcache, root, root_cache);
 	return (root);
 }
 
@@ -236,6 +231,7 @@ cvsroot_free(struct cvsroot *root)
 {
 	root->cr_ref--;
 	if (root->cr_ref == 0) {
+		TAILQ_REMOVE(&cvs_rcache, root, root_cache);
 		if (root->cr_str != NULL)
 			free(root->cr_str);
 		if (root->cr_buf != NULL)
-- 
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