libs/smux/asn_SET_OF.c

   1 /*-
   2  * Copyright (c) 2003, 2004 Lev Walkin <vlm@lionet.info>. All rights reserved.
   3  * Redistribution and modifications are permitted subject to BSD license.
   4  */
   5 #include <asn_internal.h>
   6 #include <asn_SET_OF.h>
   7 #include <errno.h>
   8
   9 /*
  10  * Add another element into the set.
  11  */
  12 int
  13 asn_set_add(void *asn_set_of_x, void *ptr) {
  14         asn_anonymous_set_ *as = _A_SET_FROM_VOID(asn_set_of_x);
  15
  16         if(as == 0 || ptr == 0) {
  17                 errno = EINVAL;         /* Invalid arguments */
  18                 return -1;
  19         }
  20
  21         /*
  22          * Make sure there's enough space to insert an element.
  23          */
  24         if(as->count == as->size) {
  25                 int _newsize = as->size ? (as->size << 1) : 4;
  26                 void *_new_arr;
  27                 _new_arr = REALLOC(as->array, _newsize * sizeof(as->array[0]));
  28                 if(_new_arr) {
  29                         as->array = (void **)_new_arr;
  30                         as->size = _newsize;
  31                 } else {
  32                         /* ENOMEM */
  33                         return -1;
  34                 }
  35         }
  36
  37         as->array[as->count++] = ptr;
  38
  39         return 0;
  40 }
  41
  42 void
  43 asn_set_del(void *asn_set_of_x, int number, int _do_free) {
  44         asn_anonymous_set_ *as = _A_SET_FROM_VOID(asn_set_of_x);
  45
  46         if(as) {
  47                 void *ptr;
  48                 if(number < 0 || number >= as->count)
  49                         return;
  50
  51                 if(_do_free && as->free) {
  52                         ptr = as->array[number];
  53                 } else {
  54                         ptr = 0;
  55                 }
  56
  57                 as->array[number] = as->array[--as->count];
  58
  59                 /*
  60                  * Invoke the third-party function only when the state
  61                  * of the parent structure is consistent.
  62                  */
  63                 if(ptr) as->free(ptr);
  64         }
  65 }
  66
  67 /*
  68  * Free the contents of the set, do not free the set itself.
  69  */
  70 void
  71 asn_set_empty(void *asn_set_of_x) {
  72         asn_anonymous_set_ *as = _A_SET_FROM_VOID(asn_set_of_x);
  73
  74         if(as) {
  75                 if(as->array) {
  76                         if(as->free) {
  77                                 while(as->count--)
  78                                         as->free(as->array[as->count]);
  79                         }
  80                         FREEMEM(as->array);
  81                         as->array = 0;
  82                 }
  83                 as->count = 0;
  84                 as->size = 0;
  85         }
  86
  87 }
  88