RFC: acl_list reverse reference

Hi,
        How does this look for a starter on providing a select 1 of N
method. This uses acl_list as the list. This would then allow us to
utilise it with other objects.

Index: squid-2.5/src/acl.c
===================================================================
RCS file: /build/cvsroot/squid-2.5/src/acl.c,v
retrieving revision 1.1.1.1
diff -u -r1.1.1.1 acl.c
--- squid-2.5/src/acl.c 14 May 2002 18:06:47 -0000 1.1.1.1
+++ squid-2.5/src/acl.c 15 May 2002 19:22:09 -0000
@@ -1721,6 +1721,31 @@
     return 0;
 }
 
+void *
+aclRoundRobin(const acl_list * list)
+{
+ static acl_list *pos = NULL;
+ int cycles = 0;
+ acl_list *ret;
+
+try_again:
+ if (pos == NULL) {
+ pos = list;
+ if (cycles++ > 0)
+ return NULL;
+ }
+
+ if (pos->contendor) {
+ ret = pos;
+ pos = pos->next;
+ } else {
+ pos = pos->next;
+ goto try_again;
+ }
+
+ return ret->this;
+}
+
 int
 aclMatchAclList(const acl_list * list, aclCheck_t * checklist)
 {
Index: squid-2.5/src/cache_cf.c
===================================================================
RCS file: /build/cvsroot/squid-2.5/src/cache_cf.c,v
retrieving revision 1.1.1.1
diff -u -r1.1.1.1 cache_cf.c
--- squid-2.5/src/cache_cf.c 14 May 2002 18:06:47 -0000 1.1.1.1
+++ squid-2.5/src/cache_cf.c 15 May 2002 18:55:26 -0000
@@ -655,6 +655,7 @@
     CBDATA_INIT_TYPE_FREECB(acl_address, freed_acl_address);
     l = cbdataAlloc(acl_address);
     parse_address(&l->addr);
+ l->acl_list.this = l;
     aclParseAclList(&l->acl_list);
     while (*tail)
         tail = &(*tail)->next;
@@ -711,6 +712,7 @@
     CBDATA_INIT_TYPE_FREECB(acl_tos, freed_acl_tos);
     l = cbdataAlloc(acl_tos);
     l->tos = tos;
+ l->acl_list.this = l;
     aclParseAclList(&l->acl_list);
     while (*tail)
         tail = &(*tail)->next;
Index: squid-2.5/src/structs.h
===================================================================
RCS file: /build/cvsroot/squid-2.5/src/structs.h,v
retrieving revision 1.1.1.1
diff -u -r1.1.1.1 structs.h
--- squid-2.5/src/structs.h 14 May 2002 18:06:47 -0000 1.1.1.1
+++ squid-2.5/src/structs.h 15 May 2002 19:01:45 -0000
@@ -251,6 +251,8 @@
     int op;
     acl *acl;
     acl_list *next;
+ int contendor;
+ void *this;
 };
 
 struct _acl_access {

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