omapip/array.c

   1 /* listener.c
   2
   3    Subroutines that support the omapi extensible array type. */
   4
   5 /*
   6  * Copyright (c) 2004-2007,2009 by Internet Systems Consortium, Inc. ("ISC")
   7  * Copyright (c) 2001-2003 by Internet Software Consortium
   8  *
   9  * Permission to use, copy, modify, and distribute this software for any
  10  * purpose with or without fee is hereby granted, provided that the above
  11  * copyright notice and this permission notice appear in all copies.
  12  *
  13  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  14  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  15  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  16  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  17  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  18  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  19  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  20  *
  21  *   Internet Systems Consortium, Inc.
  22  *   950 Charter Street
  23  *   Redwood City, CA 94063
  24  *   <info@isc.org>
  25  *   https://www.isc.org/
  26  *
  27  * This software has been written for Internet Systems Consortium
  28  * by Ted Lemon in cooperation with Vixie Enterprises and Nominum, Inc.
  29  * To learn more about Internet Systems Consortium, see
  30  * ``https://www.isc.org/''.  To learn more about Vixie Enterprises,
  31  * see ``http://www.vix.com''.   To learn more about Nominum, Inc., see
  32  * ``http://www.nominum.com''.
  33  */
  34
  35 #include "dhcpd.h"
  36
  37 #include <omapip/omapip_p.h>
  38
  39 /* Allocate a new extensible array. */
  40
  41 isc_result_t omapi_array_allocate (omapi_array_t **array,
  42                                    omapi_array_ref_t ref,
  43                                    omapi_array_deref_t deref,
  44                                    const char *file, int line)
  45 {
  46         omapi_array_t *aptr;
  47
  48         if (!array || *array)
  49                 return DHCP_R_INVALIDARG;
  50         aptr = dmalloc (sizeof (omapi_array_t),file, line);
  51         if (!aptr)
  52                 return ISC_R_NOMEMORY;
  53         *array = aptr;
  54         aptr -> ref = ref;
  55         aptr -> deref = deref;
  56         return ISC_R_SUCCESS;
  57 }
  58
  59 isc_result_t omapi_array_free (omapi_array_t **array,
  60                                const char *file, int line)
  61 {
  62         omapi_array_t *aptr;
  63         int i;
  64
  65         if (!array || !*array)
  66                 return DHCP_R_INVALIDARG;
  67         aptr = *array;
  68         for (i = 0; i < aptr -> count; i++)
  69                 if (aptr -> data [i] && aptr -> deref)
  70                         (*aptr -> deref) (&aptr -> data [i], file, line);
  71         dfree (aptr -> data, MDL);
  72         dfree (aptr, MDL);
  73         *array = (omapi_array_t *)0;
  74         return ISC_R_SUCCESS;
  75 }
  76
  77 /* Extend the size of the array by one entry (we may allocate more than that)
  78    and store the specified value in the new array element. */
  79
  80 isc_result_t omapi_array_extend (omapi_array_t *array, char *ptr,
  81                                  int *index, const char *file, int line)
  82 {
  83         isc_result_t status;
  84         int new = array -> count;
  85         status = omapi_array_set (array, ptr, new, file, line);
  86         if (index && status == ISC_R_SUCCESS)
  87                 *index = new;
  88         return status;
  89 }
  90
  91 /* Set a value in the specified array, extending it if necessary. */
  92
  93 isc_result_t omapi_array_set (omapi_array_t *array, void *ptr, int index,
  94                               const char *file, int line)
  95 {
  96         char **newbuf;
  97         int delta;
  98         isc_result_t status;
  99
 100         if (!array)
 101                 return DHCP_R_INVALIDARG;
 102         if (!ptr)
 103                 return DHCP_R_INVALIDARG;
 104         if (index < 0)
 105                 return DHCP_R_INVALIDARG;
 106
 107         /* If the proposed index is larger than the current available
 108            space in the array, make more space in the array. */
 109         if (array -> max <= index) {
 110                 delta = index - array -> max + 10;
 111                 newbuf = dmalloc ((array -> max + delta) * sizeof (char *),
 112                                   file, line);
 113                 if (!newbuf)
 114                         return ISC_R_NOMEMORY;
 115                 /* Zero the new elements. */
 116                 memset (&newbuf [array -> max], 0, (sizeof (char *)) * delta);
 117                 array -> max += delta;
 118                 /* Copy the old array data into the new buffer. */
 119                 if (array -> data) {
 120                     memcpy (newbuf,
 121                             array -> data, array -> count * sizeof (char *));
 122                     dfree (array -> data, file, line);
 123                 }
 124                 array -> data = newbuf;
 125         } else {
 126                 /* If there's already data there, and this is an array
 127                    of references, dereference what's there. */
 128                 if (array -> data [index]) {
 129                         status = ((*array -> deref) (&array -> data [index],
 130                                                      file, line));
 131
 132                         if (status != ISC_R_SUCCESS)
 133                                 return status;
 134                 }
 135         }
 136
 137         /* Store the pointer using the referencer function.  We have
 138            either just memset this to zero or dereferenced what was
 139            there previously, so there is no need to do anything if the
 140            pointer we have been asked to store is null. */
 141         if (ptr) {
 142                 status = (*array -> ref) (&array -> data [index], ptr,
 143                                           file, line);
 144                 if (status != ISC_R_SUCCESS)
 145                         return status;
 146         }
 147         if (index >= array -> count)
 148                 array -> count = index + 1;
 149         return ISC_R_SUCCESS;
 150 }
 151
 152 isc_result_t omapi_array_lookup (char **ptr, omapi_array_t *array, int index,
 153                                  const char *file, int line)
 154 {
 155         if (!array || !ptr || *ptr || index < 0 || index >= array -> count)
 156                 return DHCP_R_INVALIDARG;
 157         if (array -> data [index])
 158                 return (*array -> ref) (ptr,
 159                                         array -> data [index], file, line);
 160         return ISC_R_NOTFOUND;
 161 }
 162