chanstats/chanstatsalloc.c

   1 /* Allocators for chanstats */
   2
   3 #include "chanstats.h"
   4
   5 #include <stdlib.h>
   6
   7 #define ALLOCUNIT 100
   8
   9 static void *malloclist;
  10 static chanstats *freecs;
  11
  12 void *cstsmalloc(size_t size) {
  13   void **mem;
  14
  15   /* Get the memory we want, with an extra four bytes for our pointer */
  16   mem=(void **)malloc(size+sizeof(void *));
  17
  18   /* Set the first word to point at the last chunk we got */
  19   *mem=malloclist;
  20
  21   /* Now set the "last chunk" pointer to the address of this one */
  22   malloclist=(void *)mem;
  23
  24   /* Return the rest of the memory to the caller */
  25   return (void *)(mem+1);
  26 }
  27
  28 void cstsfreeall() {
  29   void *vp,**vp2;
  30
  31   vp=malloclist;
  32
  33   while (vp!=NULL) {
  34     vp2=(void **)vp;
  35     vp=*vp2;
  36     free((void *)vp2);
  37   }
  38 }
  39
  40 void initchanstatsalloc() {
  41   malloclist=NULL;
  42   freecs=NULL;
  43 }
  44
  45 chanstats *getchanstats() {
  46   chanstats *csp;
  47   int i;
  48
  49   if (freecs==NULL) {
  50     freecs=(chanstats *)cstsmalloc(ALLOCUNIT*sizeof(chanstats));
  51     for(i=0;i<(ALLOCUNIT-1);i++) {
  52       freecs[i].index=(chanindex *)&(freecs[i+1]);
  53     }
  54     freecs[ALLOCUNIT-1].index=NULL;
  55   }
  56
  57   csp=freecs;
  58   freecs=(chanstats *)csp->index;
  59
  60   return csp;
  61 }
  62
  63 void freechanstats(chanstats *csp) {
  64   csp->index=(chanindex *)freecs;
  65   freecs=csp;
  66 }