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#include <string.h>
#include <assert.h>
#include "user_data.h"
struct user_data{
i64 userid;
int *fds;
i64 fds_cap,fds_len;
};
struct hash_item{
struct user_data data;
struct hash_item *next;
};
#define USER_HASH_SIZE (16)
static struct hash_item *user_hash[USER_HASH_SIZE];
static struct hash_item* find_userdata(i64 userid){
struct hash_item *item=user_hash[userid%USER_HASH_SIZE];
while(item&&item->data.userid!=userid)item=item->next;
return item;
}
static void remove_userdata(i64 userid){
struct hash_item *item=user_hash[userid%USER_HASH_SIZE];
assert(item);
if(item->data.userid==userid){
user_hash[userid%USER_HASH_SIZE]=item->next;
free(item->data.fds);
free(item);
return;
}
struct hash_item *parent=NULL;
while(item->data.userid!=userid){
parent=item;
item=item->next;
assert(item);
}
parent->next=item->next;
free(item->data.fds);
free(item);
}
void userdata_register(i64 userid,int fd){
struct hash_item *item=find_userdata(userid);
if(item){
for(i64 i=0;i<item->data.fds_len;i++){
if(item->data.fds[i]==fd){
die("userdata_register(%" PRIi64 ", %d) while pair already existed",userid,fd);
}
}
if(item->data.fds_len==item->data.fds_cap){
item->data.fds_cap*=2;
item->data.fds=realloc(item->data.fds,item->data.fds_cap,int);
}
item->data.fds[item->data.fds_len++]=fd;
} else {
item=malloc(1,struct hash_item);
item->data.userid=userid;
item->data.fds_cap=2;
item->data.fds_len=1;
item->data.fds=malloc(item->data.fds_cap,int);
item->data.fds[0]=fd;
item->next=user_hash[userid%USER_HASH_SIZE];
user_hash[userid%USER_HASH_SIZE]=item;
}
}
void userdata_unregister(i64 userid,int fd){
struct hash_item *item=find_userdata(userid);
assert(item);
i64 i;
for(i=0;i<item->data.fds_len;i++){
if(item->data.fds[i]==fd)break;
}
if(i==item->data.fds_len){
die("userdata_unregister(%" PRIi64 ", %d) while nonexistent",userid,fd);
}
memmove(item->data.fds+i,item->data.fds+i+1,item->data.fds_len-i-1);
item->data.fds_len--;
if(item->data.fds_len==0){
remove_userdata(userid);
}
}
const int* userdata_online(i64 userid,i64 *nfds){
struct hash_item *item=find_userdata(userid);
if(!item){
if(nfds)*nfds=0;
return NULL;
}
assert(item->data.fds_len!=0);
if(nfds)*nfds=item->data.fds_len;
return item->data.fds;
}
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