core/hooks.c

   1 /* hooks.c */
   2
   3 #include "hooks.h"
   4 #include <assert.h>
   5 #include "../lib/array.h"
   6
   7 array hooks[HOOKMAX];
   8
   9 void inithooks() {
  10   int i;
  11
  12   hookqueuelength=0;
  13   for (i=0;i<HOOKMAX;i++) {
  14     array_init(&(hooks[i]),sizeof(HookCallback));
  15     array_setlim1(&(hooks[i]),2);
  16     array_setlim2(&(hooks[i]),2);
  17   }
  18 }
  19
  20 int registerhook(int hooknum, HookCallback callback) {
  21   int i;
  22   HookCallback *hcbs;
  23
  24   if (hooknum>HOOKMAX)
  25     return 1;
  26
  27   hcbs=(HookCallback *)(hooks[hooknum].content);
  28   for(i=0;i<hooks[hooknum].cursi;i++)
  29     if(hcbs[i]==callback)
  30       return 1;
  31
  32   i=array_getfreeslot(&hooks[hooknum]);
  33   hcbs=(HookCallback *)(hooks[hooknum].content);
  34   hcbs[i]=callback;
  35
  36   return 0;
  37 }
  38
  39 int deregisterhook(int hooknum, HookCallback callback) {
  40   int i;
  41   HookCallback *hcbs;
  42
  43   if (hooknum>HOOKMAX)
  44     return 1;
  45
  46   hcbs=(HookCallback *)(hooks[hooknum].content);
  47
  48   for(i=0;i<hooks[hooknum].cursi;i++)
  49     if(hcbs[i]==callback) {
  50       array_delslot(&(hooks[hooknum]),i);
  51       return 0;
  52     }
  53
  54   return 1;
  55 }
  56
  57 void triggerhook(int hooknum, void *arg) {
  58   int i;
  59   HookCallback *hcbs;
  60
  61   if (hooknum>HOOKMAX)
  62     return;
  63
  64   hookqueuelength++;
  65   hcbs=(HookCallback *)(hooks[hooknum].content);
  66   for (i=0;i<hooks[hooknum].cursi;i++) {
  67     (hcbs[i])(hooknum, arg);
  68   }
  69   hookqueuelength--;
  70
  71   if (!hookqueuelength && hooknum!=HOOK_CORE_ENDOFHOOKSQUEUE)
  72     triggerhook(HOOK_CORE_ENDOFHOOKSQUEUE, 0);
  73 }
  74