proplib/prop_expand.c

   1 /* Broken, tomorrow will be fixed :) */
   2
   3 #include <err.h>
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <prop/proplib.h>
   7
   8 #define INIT_CAPACITY 10
   9 #define NUM_STRINGS 32
  10 #define PRINT_STEP 5    /* Print stats every 5 steps */
  11
  12 /* Function prototypes */
  13 void print_array_stats(const prop_array_t pa);
  14
  15 int
  16 main(int argc, char *argv[])
  17 {
  18     prop_array_t pa;
  19     prop_string_t ps;
  20     unsigned int i;
  21
  22     /*
  23      * Create array object with initial capacity set to
  24      * ``INIT_CAPACITY''. The array will expand on demand
  25      * if its count exceeds its capacity.
  26      * This happens in prop_array_add() with ``EXPAND_STEP''
  27      * step, as defined in libprop/prop_array.c file.
  28      */
  29     pa = prop_array_create_with_capacity(INIT_CAPACITY);
  30     if (pa == NULL)
  31         errx(EXIT_FAILURE, "prop_array_create_with_capacity()");
  32
  33     /* Create prop_string_t object */
  34     ps = prop_string_create_cstring("foo");
  35     if (ps == NULL) {
  36         prop_object_release(pa);
  37         errx(EXIT_FAILURE, "prop_string_create_cstring()");
  38     }
  39
  40     /*
  41      * Add up to ``NUM_STRINGS'' references of prop_string_t
  42      * object to array and watch if/how the latter expands on demand.
  43      */
  44     for (i = 0; i < NUM_STRINGS; i++) {
  45         /* Print statistics every ``PRINT_STEP'' step */
  46         if (i % PRINT_STEP == 0)
  47             print_array_stats(pa);
  48
  49         /* Add object reference in array */
  50         if (prop_array_add(pa, ps) == FALSE) {
  51             prop_object_release(pa);
  52             prop_object_release(ps);
  53             err(EXIT_FAILURE, "prop_array_add()");
  54         }
  55     }
  56
  57 CLEANUP:;
  58     /*
  59      * Remove references from array and note that
  60      * if an expansion has happened before, array's
  61      * capacity won't reduce to its initial value,
  62      * i.e. ``INIT_CAPACITY''.
  63      */
  64     for (i = 0; i < NUM_STRINGS; i++) {
  65         /* Print statistics every ``PRINT_STEP'' step */
  66         if (i % PRINT_STEP == 0)
  67             print_array_stats(pa);
  68
  69         prop_array_remove(pa, NUM_STRINGS - i - 1);
  70     }
  71
  72     /* Release objects */
  73     prop_object_release(pa);
  74     prop_object_release(ps);
  75
  76     print_array_stats(pa);
  77
  78     return EXIT_SUCCESS;
  79 }
  80
  81 void print_array_stats(const prop_array_t pa)
  82 {
  83     printf("count = %u\tcapacity = %u\n",
  84            prop_array_count(pa),
  85            prop_array_capacity(pa));
  86 }