proplib/prop_write_array.c

   1 /*
   2  * Compile with:
   3  * gcc prop_write_array.c -o prop_write_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 #define INIT_CAPACITY 10
  12
  13 int main(int argc, char *argv[])
  14 {
  15     /*
  16      * Declare a pointer to a prop_array object
  17      * Note that prop_array_t is a pointer being
  18      * hidden inside a typedef, i.e.
  19      * typedef struct _prop_array *prop_array_t;
  20      */
  21     prop_array_t pa;
  22     prop_string_t ps;
  23     int i;
  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 [arguments]\n", getprogname());
  31         exit(EXIT_FAILURE);
  32     }
  33
  34     /*
  35      * Create array object with initial capacity set to `INIT_CAPACITY'.
  36      * Note that the array will expand on demand by the prop_array_add()
  37      * with `EXPAND_STEP' step as defined in libprop/prop_array.c
  38      */
  39     pa = prop_array_create_with_capacity(INIT_CAPACITY);
  40     if (pa == NULL)
  41         err(EXIT_FAILURE, "prop_array_create_with_capacity()");
  42
  43     /*
  44      * For every argument, create a prop_string_t object
  45      * that references it and store it in the array
  46      */
  47     for (i = 0; i < argc; i++) {
  48         ps = prop_string_create_cstring_nocopy(argv[i]);
  49         if (ps == NULL) {
  50             prop_object_release(pa);
  51             err(EXIT_FAILURE, "prop_string_create_cstring_nocopy()");
  52         }
  53
  54         if (prop_array_add(pa, ps) == false) {
  55             prop_object_release(pa);
  56             prop_object_release(ps);
  57             err(EXIT_FAILURE, "prop_array_add()");
  58         }
  59
  60         prop_object_release(ps);
  61     }
  62
  63     /* Export array contents to file as XML */
  64     if (prop_array_externalize_to_file(pa, argv[1]) == false) {
  65         prop_object_release(pa);
  66         err(EXIT_FAILURE, "prop_array_externalize_to_file()");
  67     }
  68
  69     /* Release array object */
  70     prop_object_release(pa);
  71
  72     return EXIT_SUCCESS;
  73 }