nick/nickalloc.c

   1 /* nick/host/realname allocator */
   2
   3 #include "nick.h"
   4 #include <assert.h>
   5 #include <stdlib.h>
   6
   7 #define ALLOCUNIT   100
   8
   9 /* Hosts and realname structures are the same size */
  10 /* This assumption is checked in initnickalloc(); */
  11
  12 nick *freenicks;
  13 host *freehosts;
  14
  15 void initnickalloc() {
  16   freenicks=NULL;
  17   freehosts=NULL;
  18
  19   assert(sizeof(host)==sizeof(realname));
  20 }
  21
  22 realname *newrealname() {
  23   return (realname *)newhost();
  24 }
  25
  26 void freerealname(realname *rn) {
  27   freehost((host *)rn);
  28 }
  29
  30 nick *newnick() {
  31   nick *np;
  32   int i;
  33
  34   if (freenicks==NULL) {
  35     freenicks=(nick *)malloc(ALLOCUNIT*sizeof(nick));
  36     for (i=0;i<(ALLOCUNIT-1);i++) {
  37       freenicks[i].next=&(freenicks[i+1]);
  38     }
  39     freenicks[ALLOCUNIT-1].next=NULL;
  40   }
  41
  42   np=freenicks;
  43   freenicks=np->next;
  44
  45   return np;
  46 }
  47
  48 void freenick (nick *np) {
  49   np->next=freenicks;
  50   freenicks=np;
  51 }
  52
  53 host *newhost() {
  54   host *nh;
  55   int i;
  56
  57   if (freehosts==NULL) {
  58     freehosts=(host *)malloc(ALLOCUNIT*sizeof(host));
  59     for (i=0;i<(ALLOCUNIT-1);i++) {
  60       freehosts[i].next=&(freehosts[i+1]);
  61     }
  62     freehosts[ALLOCUNIT-1].next=NULL;
  63   }
  64
  65   nh=freehosts;
  66   freehosts=nh->next;
  67
  68   return nh;
  69 }
  70
  71 void freehost (host *hp) {
  72   hp->next=freehosts;
  73   freehosts=hp;
  74 }