rdoff/collectn.c

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