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/******************************************************************************
* Project: PROJ.4
* Purpose: Memory management for proj.4.
* This version includes an implementation of generic destructors,
* for memory deallocation for the large majority of PJ-objects
* that do not allocate anything alse than the PJ-object itself,
* and its associated opaque object - i.e. no additional malloc'ed
* memory inside the opaque object.
*
* Author: Gerald I. Evenden (Original proj.4 author),
* Frank Warmerdam (2000) pj_malloc?
* Thomas Knudsen (2016) - freeup/dealloc parts
*
******************************************************************************
* Copyright (c) 2000, Frank Warmerdam
* Copyright (c) 2016, Thomas Knudsen / SDFE
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*****************************************************************************/
/* allocate and deallocate memory */
/* These routines are used so that applications can readily replace
** projection system memory allocation/deallocation call with custom
** application procedures. */
#include <projects.h>
#include <errno.h>
/**********************************************************************/
void *pj_malloc(size_t size) {
/***********************************************************************
Currently, pj_malloc is a hack to solve an errno problem.
The problem is described in more details at
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=86420.
It seems, that pj_init and similar functions incorrectly
(under debian/glibs-2.3.2) assume that pj_malloc resets
errno after success. pj_malloc tries to mimic this.
***********************************************************************/
int old_errno = errno;
void *res = malloc(size);
if ( res && !old_errno )
errno = 0;
return res;
}
/**********************************************************************/
void pj_dalloc(void *ptr) {
/**********************************************************************/
free(ptr);
}
/**********************************************************************/
void *pj_calloc (size_t n, size_t size) {
/***********************************************************************
pj_calloc is the pj-equivalent of calloc().
It allocates space for an array of <n> elements of size <size>.
The array is initialized to zeros.
***********************************************************************/
void *res = pj_malloc (n*size);
if (0==res)
return 0;
memset (res, 0, n*size);
return res;
}
/**********************************************************************/
void *pj_dealloc (void *ptr) {
/***********************************************************************
pj_dealloc supports the common use case of "clean up and return a null
pointer" to signal an error in a multi level allocation:
struct foo { int bar; int *baz; };
struct foo *p = pj_calloc (1, sizeof (struct foo));
if (0==p)
return 0;
p->baz = pj_calloc (10, sizeof(int));
if (0==p->baz)
return pj_dealloc (p); // clean up + signal error by 0-return
return p; // success
***********************************************************************/
if (0==ptr)
return 0;
pj_dalloc (ptr);
return 0;
}
/*****************************************************************************/
void *pj_freeup_msg_plain (PJ *P, int errlev) { /* Destructor */
/*****************************************************************************
Does memory deallocation for "plain" PJ objects, i.e. that vast majority
of PJs where the opaque object does not contain any additionally
allocated memory.
******************************************************************************/
if (0==P)
return 0;
if (0!=errlev)
pj_ctx_set_errno (P->ctx, errlev);
if (0==P->opaque)
return pj_dealloc (P);
pj_dealloc (P->opaque);
return pj_dealloc(P);
}
/*****************************************************************************/
void pj_freeup_plain (PJ *P) {
/*****************************************************************************
Adapts pj_freeup_msg_plain to the format defined for the callback in
the PJ object.
i.e. reduces most instances of projection deallocation code to:
static void freeup (PJ *P) {
pj_freeup_plain (P);
return;
}
rather than:
static void *freeup_msg_add (PJ *P, int errlev) {
if (0==P)
return 0;
pj_ctx_set_errno (P->ctx, errlev);
if (0==P->opaque)
return pj_dealloc (P);
(* projection specific deallocation goes here *)
pj_dealloc (P->opaque);
return pj_dealloc(P);
}
(* Adapts pipeline_freeup to the format defined for the PJ object *)
static void freeup_msg_add (PJ *P) {
freeup_new_add (P, 0);
return;
}
******************************************************************************/
pj_freeup_msg_plain (P, 0);
return;
}
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