rdoff/collectn.c

   1 /*
   2  * collectn.c - implements variable length pointer arrays [collections].
   3  *
   4  * This file is public domain.
   5  */
   6
   7 #include "compiler.h"
   8 #include <stdlib.h>
   9 #include "collectn.h"
  10
  11 void collection_init(Collection * c)
  12 {
  13     int i;
  14
  15     for (i = 0; i < 32; i++)
  16         c->p[i] = NULL;
  17     c->next = NULL;
  18 }
  19
  20 void **colln(Collection * c, int index)
  21 {
  22     while (index >= 32) {
  23         index -= 32;
  24         if (c->next == NULL) {
  25             c->next = malloc(sizeof(Collection));
  26             collection_init(c->next);
  27         }
  28         c = c->next;
  29     }
  30     return &(c->p[index]);
  31 }
  32
  33 void collection_reset(Collection * c)
  34 {
  35     int i;
  36
  37     if (c->next) {
  38         collection_reset(c->next);
  39         free(c->next);
  40     }
  41
  42     c->next = NULL;
  43     for (i = 0; i < 32; i++)
  44         c->p[i] = NULL;
  45 }