proplib/prop_read_array_.c

   1 /*
   2  * Compile with:
   3  * gcc prop_read_array.c -o prop_read_array -lprop -Wall -W -Wextra -ansi -pedantic
   4  */
   5
   6 #include <err.h>
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include <prop/proplib.h>
  10
  11 int main(int argc, char *argv[])
  12 {
  13     /*
  14      * Declare a pointer to a prop_array object
  15      * Note that prop_array_t is a pointer being
  16      * hidden inside a typedef, i.e.
  17      * typedef struct _prop_array *prop_array_t;
  18      */
  19     prop_array_t pa;
  20     prop_object_t po;
  21     prop_object_iterator_t pit;
  22     unsigned int i;
  23     const char *s;
  24
  25     /* No effect in NetBSD, but increases portability */
  26     setprogname(argv[0]);
  27
  28     /* Check argument count */
  29     if (argc != 2) {
  30         fprintf(stderr, "Usage: %s <data.xml>\n", getprogname());
  31         exit(EXIT_FAILURE);
  32     }
  33
  34     /* Read array contents from external XML file */
  35     pa = prop_array_internalize_from_file(argv[1]);
  36     if (pa == NULL)
  37         err(EXIT_FAILURE, "prop_array_internalize_from_file()");
  38
  39     /* Skim through every item of the array */
  40     printf("-> Iterate with prop_array_count()\n");
  41     for (i = 0; i < prop_array_count(pa); i++) {
  42         /* Get the object stored at the i-th array index */
  43         po = prop_array_get(pa, i);
  44
  45         /* Just a sanity check */
  46         if (prop_object_type(po) != PROP_TYPE_STRING) {
  47             prop_object_release(pa);
  48             errx(EXIT_FAILURE, "invalid string type");
  49         }
  50
  51         s = prop_string_cstring_nocopy(po);
  52         printf("%s\n", s);
  53     }
  54
  55     /*
  56      * We will now iterate through the items of the array,
  57      * but this time we will exploit a prop_array_iterator_t
  58      */
  59     printf("-> Iterate with prop_array_iterator_t\n");
  60     pit = prop_array_iterator(pa);
  61     if (pit == NULL) {
  62         prop_object_release(pa);
  63         err(EXIT_FAILURE, "prop_array_iterator()");
  64     }
  65
  66     /* Traverse */
  67     while((po = prop_object_iterator_next(pit)) != NULL) {
  68         s = prop_string_cstring_nocopy(po);
  69         printf("%s\n", s);
  70     }
  71
  72     /* Release objects */
  73     prop_object_release(pa);
  74     prop_object_iterator_release(pit);
  75
  76     return EXIT_SUCCESS;
  77 }