libsecurity_asn1/lib/prmem.h

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /*
   3  * The contents of this file are subject to the Mozilla Public
   4  * License Version 1.1 (the "License"); you may not use this file
   5  * except in compliance with the License. You may obtain a copy of
   6  * the License at http://www.mozilla.org/MPL/
   7  *
   8  * Software distributed under the License is distributed on an "AS
   9  * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
  10  * implied. See the License for the specific language governing
  11  * rights and limitations under the License.
  12  *
  13  * The Original Code is the Netscape Portable Runtime (NSPR).
  14  *
  15  * The Initial Developer of the Original Code is Netscape
  16  * Communications Corporation.  Portions created by Netscape are
  17  * Copyright (C) 1998-2000 Netscape Communications Corporation.  All
  18  * Rights Reserved.
  19  *
  20  * Contributor(s):
  21  *
  22  * Alternatively, the contents of this file may be used under the
  23  * terms of the GNU General Public License Version 2 or later (the
  24  * "GPL"), in which case the provisions of the GPL are applicable
  25  * instead of those above.  If you wish to allow use of your
  26  * version of this file only under the terms of the GPL and not to
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  28  * indicate your decision by deleting the provisions above and
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  30  * the GPL.  If you do not delete the provisions above, a recipient
  31  * may use your version of this file under either the MPL or the
  32  * GPL.
  33  */
  34
  35 /*
  36 ** File: prmem.h
  37 ** Description: API to NSPR 2.0 memory management functions
  38 **
  39 */
  40 #ifndef prmem_h___
  41 #define prmem_h___
  42
  43 #include <security_asn1/prtypes.h>
  44 #include <stddef.h>
  45 #include <stdlib.h>
  46
  47 PR_BEGIN_EXTERN_C
  48
  49 /*
  50 ** Thread safe memory allocation.
  51 **
  52 ** NOTE: pr wraps up malloc, free, calloc, realloc so they are already
  53 ** thread safe (and are not declared here - look in stdlib.h).
  54 */
  55
  56 /*
  57 ** PR_Malloc, PR_Calloc, PR_Realloc, and PR_Free have the same signatures
  58 ** as their libc equivalent malloc, calloc, realloc, and free, and have
  59 ** the same semantics.  (Note that the argument type size_t is replaced
  60 ** by PRUint32.)  Memory allocated by PR_Malloc, PR_Calloc, or PR_Realloc
  61 ** must be freed by PR_Free.
  62 */
  63
  64 NSPR_API(void *) PR_Malloc(PRSize size);
  65
  66 NSPR_API(void *) PR_Calloc(PRSize nelem, PRSize elsize);
  67
  68 NSPR_API(void *) PR_Realloc(void *ptr, PRSize size);
  69
  70 NSPR_API(void) PR_Free(void *ptr);
  71
  72 /*
  73 ** The following are some convenience macros defined in terms of
  74 ** PR_Malloc, PR_Calloc, PR_Realloc, and PR_Free.
  75 */
  76
  77 /***********************************************************************
  78 ** FUNCTION:    PR_MALLOC()
  79 ** DESCRIPTION:
  80 **   PR_NEW() allocates an untyped item of size _size from the heap.
  81 ** INPUTS:  _size: size in bytes of item to be allocated
  82 ** OUTPUTS:     untyped pointer to the node allocated
  83 ** RETURN:      pointer to node or error returned from malloc().
  84 ***********************************************************************/
  85 #define PR_MALLOC(_bytes) (PR_Malloc((_bytes)))
  86
  87 /***********************************************************************
  88 ** FUNCTION:    PR_NEW()
  89 ** DESCRIPTION:
  90 **   PR_NEW() allocates an item of type _struct from the heap.
  91 ** INPUTS:  _struct: a data type
  92 ** OUTPUTS:     pointer to _struct
  93 ** RETURN:      pointer to _struct or error returns from malloc().
  94 ***********************************************************************/
  95 #define PR_NEW(_struct) ((_struct *) PR_MALLOC(sizeof(_struct)))
  96
  97 /***********************************************************************
  98 ** FUNCTION:    PR_REALLOC()
  99 ** DESCRIPTION:
 100 **   PR_REALLOC() re-allocates _ptr bytes from the heap as a _size
 101 **   untyped item.
 102 ** INPUTS:      _ptr: pointer to node to reallocate
 103 **          _size: size of node to allocate
 104 ** OUTPUTS:     pointer to node allocated
 105 ** RETURN:      pointer to node allocated
 106 ***********************************************************************/
 107 #define PR_REALLOC(_ptr, _size) (PR_Realloc((_ptr), (_size)))
 108
 109 /***********************************************************************
 110 ** FUNCTION:    PR_CALLOC()
 111 ** DESCRIPTION:
 112 **   PR_CALLOC() allocates a _size bytes untyped item from the heap
 113 **   and sets the allocated memory to all 0x00.
 114 ** INPUTS:      _size: size of node to allocate
 115 ** OUTPUTS:     pointer to node allocated
 116 ** RETURN:      pointer to node allocated
 117 ***********************************************************************/
 118 #define PR_CALLOC(_size) (PR_Calloc(1, (_size)))
 119
 120 /***********************************************************************
 121 ** FUNCTION:    PR_NEWZAP()
 122 ** DESCRIPTION:
 123 **   PR_NEWZAP() allocates an item of type _struct from the heap
 124 **   and sets the allocated memory to all 0x00.
 125 ** INPUTS:      _struct: a data type
 126 ** OUTPUTS:     pointer to _struct
 127 ** RETURN:      pointer to _struct
 128 ***********************************************************************/
 129 #define PR_NEWZAP(_struct) ((_struct*)PR_Calloc(1, sizeof(_struct)))
 130
 131 /***********************************************************************
 132 ** FUNCTION:    PR_DELETE()
 133 ** DESCRIPTION:
 134 **   PR_DELETE() unallocates an object previosly allocated via PR_NEW()
 135 **   or PR_NEWZAP() to the heap.
 136 ** INPUTS:      pointer to previously allocated object
 137 ** OUTPUTS:     the referenced object is returned to the heap
 138 ** RETURN:      void
 139 ***********************************************************************/
 140 #define PR_DELETE(_ptr) { PR_Free(_ptr); (_ptr) = NULL; }
 141
 142 /***********************************************************************
 143 ** FUNCTION:    PR_FREEIF()
 144 ** DESCRIPTION:
 145 **   PR_FREEIF() conditionally unallocates an object previously allocated
 146 **   vial PR_NEW() or PR_NEWZAP(). If the pointer to the object is
 147 **   equal to zero (0), the object is not released.
 148 ** INPUTS:      pointer to previously allocated object
 149 ** OUTPUTS:     the referenced object is conditionally returned to the heap
 150 ** RETURN:      void
 151 ***********************************************************************/
 152 #define PR_FREEIF(_ptr) if (_ptr) PR_DELETE(_ptr)
 153
 154 PR_END_EXTERN_C
 155
 156 #endif /* prmem_h___ */