libtu/iterable.c

   1 /*
   2  * libtu/iterable.c
   3  *
   4  * Copyright (c) Tuomo Valkonen 2005.
   5  *
   6  * You may distribute and modify this library under the terms of either
   7  * the Clarified Artistic License or the GNU LGPL, version 2.1 or later.
   8  */
   9
  10 #include "iterable.h"
  11
  12
  13 void *iterable_nth(uint n, VoidIterator *iter, void *st)
  14 {
  15     void *p;
  16
  17     while(1){
  18         p=iter(st);
  19         if(p==NULL || n==0)
  20             break;
  21         n--;
  22     }
  23
  24     return p;
  25 }
  26
  27
  28 bool iterable_is_on(void *p, VoidIterator *iter, void *st)
  29 {
  30     while(1){
  31         void *p2=iter(st);
  32         if(p2==NULL)
  33             return FALSE;
  34         if(p==p2)
  35             return TRUE;
  36     }
  37 }
  38
  39
  40 void *iterable_find(BoolFilter *f, void *fparam,
  41                     VoidIterator *iter, void *st)
  42 {
  43     while(1){
  44         void *p=iter(st);
  45         if(p==NULL)
  46             return NULL;
  47         if(f(p, fparam))
  48             return p;
  49     }
  50 }
  51