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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <stdint.h>
  4. #include <assert.h>
  5.  
  6. struct size_t_elem {
  7.   size_t lu;
  8.   struct size_t_elem *next;
  9. };
  10.  
  11. /* List structure requiring manual bookkeeping for size */
  12. struct size_t_list {
  13.   uint32_t size;
  14.   const struct size_t_elem *list;
  15. };
  16.  
  17. struct size_t_elem **size_t_list_end(struct size_t_elem **size_t_elem) {
  18.   assert(size_t_elem);
  19.   while (*size_t_elem)
  20.     size_t_elem = &size_t_elem[0]->next;
  21.   return size_t_elem;
  22. }
  23.  
  24. struct size_t_elem **size_t_list_prepend(struct size_t_elem **size_t_elem,
  25.                                          const size_t lu) {
  26.   struct size_t_elem *x = malloc(sizeof *x);
  27.   assert(size_t_elem);
  28.   if (!x)
  29.     return NULL;
  30.   x->lu = lu;
  31.   x->next = *size_t_elem;
  32.   *size_t_elem = x;
  33.   return &x->next;
  34. }
  35.  
  36. struct size_t_elem **size_t_list_append(struct size_t_elem **p,
  37.                                         const size_t lu) {
  38.   return size_t_list_prepend(size_t_list_end(p), lu);
  39. }
  40.  
  41. void size_t_list_push(uint32_t *ll_n,
  42.                       struct size_t_elem ***ll_root,
  43.                       const size_t lu) {
  44.   (*ll_n)++;
  45.   *ll_root = size_t_list_append(*ll_root, lu);
  46. }
  47.  
  48. int main(void) {
  49.   struct size_t_elem *full_ll = NULL;
  50.   struct size_t_elem **ll_cur_ptr = &full_ll, *iter;
  51.  
  52.   struct size_t_list *ll = malloc(sizeof *ll);
  53.  
  54.   const size_t l[] = {5, 6, 10, 44};
  55.   size_t i;
  56.   for(i=0; i<sizeof l/sizeof l[0]; i++)
  57.     size_t_list_push(&ll->size, &ll_cur_ptr, l[i]);
  58.  
  59.   for (iter = (struct size_t_elem *)ll->list, i=0; iter != NULL; iter = iter->next, i++)
  60.     printf("ll->list[%lu] = %lu\n", i, iter->lu);
  61.  
  62.   return EXIT_SUCCESS;
  63. }
  64.  
Success #stdin #stdout 0.01s 5436KB
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https://ideone.com/miu03S
language:
C (gcc 8.3)
created:
3 years ago
visibility:
secret

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