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/* Copyright (c) 1987 Massachusetts Institute of Technology */
/*
* $Source$
* $Header$
*/
#ifndef lint
static char *rcsid_cm_c = "$Header$";
#endif lint
#include <zephyr/mit-copyright.h>
#include <zephyr/zephyr.h>
#include "zserver.h"
/*
* Class manager subsystem.
* external functions are:
* Code_t cm_register(client, class)
* Code_t cm_deregister(client, class)
* struct qelem *cm_lookup(class)
* ZClientDesc_t *client;
* char *class;
*/
/* Private variables */
typedef struct _ZClientList_t {
struct _ZClientList_t *q_forw;
struct _ZClientList_t *q_back;
ZClientDesc_t *client;
} ZClientList_t;
typedef struct _ZClass_t {
struct _ZClass_t *q_forw;
struct _ZClass_t *q_back;
char *classname;
ZClientList_t *clientlist;
} ZClass_t;
#define NULLZCT ((ZClass_t *) 0)
#define NULLZCDT ((ZClientDesc_t *) 0)
#define NULLZCLT ((ZClientList_t *) 0)
#define EMPTY_CLASS 2000
#define HSHSIZ 8192
#define HSHMUL 243
static ZClass_t *class_bucket[511];
/* private routines */
static ZClass_t *class_alloc(class)
char *class;
{
register ZClass_t *ptr;
if ((ptr = (ZClass_t *) malloc(sizeof(ZClass_t))) == NULLZCT)
return(NULLZCT);
if ((ptr->classname = strsave(class)) == NULL) {
free((char *) ptr);
return(NULLZCT);
}
return(ptr);
}
static ZClientList_t *client_alloc(client)
ZClientDesc_t *client;
{
register ZClientList_t *ptr;
if ((ptr = (ZClientList_t *) malloc(sizeof(ZClientList_t))) == NULLZCLT)
return(NULLZCLT);
ptr->client = client;
return(ptr);
}
static Code_t insert_client(ptr, client)
ZClass_t *ptr;
ZClientDesc_t *client;
{
register ZClientList_t *listp;
if ((listp = client_alloc(client)) == NULLZCLT)
return(ZERR_UNIX);
if (ptr->clientlist == NULLZCLT)
ptr->clientlist = listp;
else
insque(listp, ptr->clientlist);
return(ZERR_NONE);
}
static Code_t remove_client(ptr, client)
ZClass_t *ptr;
ZClientDesc_t *client;
{
register ZClientList_t *listp = ptr->clientlist;
register ZClientList_t *listp2;
if (listp->client == client) { /* found him */
if (listp->q_forw = listp) { /* this is the only elem on this queue */
ptr->clientlist = NULLZCLT;
free(listp);
return(EMPTY_CLASS);
}
/* ok, remove him, being careful to reset the pointer to the queue */
ptr->clientlist = listp->q_forw;
remque(listp);
free(listp);
return(ZERR_NONE);
} else {
for (listp2 = listp->q_forw; listp2 != listp; listp2 = listp2->q_forw)
/* walk down list, looking for him */
if (listp2->client == client) {
reqmue(listp);
free(listp);
return(ZERR_NONE);
}
return(ZERR_S_BADASSOC);
}
}
/* */
/* public routines */
Code_t cm_register(client, class)
ZClientDesc_t *client;
char *class;
{
register ZClass_t *ptr, *ptr2;
int hashval = hash(class);
if ((ptr = class_bucket[hashval]) == NULLZCT) {
/* not registered */
if ((ptr = class_alloc(class)) == NULLZCT)
return(ZERR_UNIX);
class_bucket[hashval] = ptr;
return(insert_client(ptr, client));
} else if (!strcmp(ptr->classname, class)) /* match! */
return(insert_client(ptr, client));
else {
for (ptr2 = ptr->q_forw; ptr2 != ptr; ptr2 = ptr2->q_forw) {
/* walk down the list, looking for a match */
if (!strcmp(ptr2->classname, class))
return(insert_client(ptr2, client));
}
if (ptr2 = ptr) { /* fell off the end, no match */
if ((ptr2 = class_alloc(class)) == NULLZCT)
return(ZERR_UNIX);
insque(ptr2, ptr); /* insert new class into hash bucket */
return(insert_client(ptr2, client));
}
}
}
Code_t cm_deregister(client, class)
ZClientDesc_t *client;
char *class;
{
register ZClass_t *ptr, *ptr2;
int retval = -1;
int hashval = hash(class);
if ((ptr = class_bucket[hashval]) == NULLZCT)
/* no such class to deregister */
return(ZERR_S_BADASSOC);
if (!strcmp(ptr->classname, class)) { /* match! */
retval = remove_client(ptr, client);
/* handle retval here*/
ptr2 = ptr;
}
else {
for (ptr2 = ptr->q_forw; ptr2 != ptr; ptr2 = ptr2->q_forw) {
/* walk down the list, looking for a match */
if (!strcmp(ptr2->classname, class)) {
retval = remove_client(ptr2, client);
/* handle it here too */
break;
}
}
/* fell off, error */
return(ZERR_S_BADASSOC);
}
}
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