xref: /third_party/mesa3d/src/util/ptralloc.h (revision bf215546) 
1/*
2 * Copyright © 2021 Valve Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 *
23 * Authors:
24 *    Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
25 */
26
27#pragma once
28
29#include <stdlib.h>
30#include <inttypes.h>
31#include <stdbool.h>
32#include "macros.h"
33
34#ifdef __cplusplus
35extern "C" {
36#endif
37
38static inline void *
39ptralloc(size_t base_size, unsigned member_count, size_t *member_sizes, void ***members)
40{
41   size_t size = base_size;
42   for (unsigned i = 0; i < member_count; i++)
43      size += member_sizes[i];
44
45   uint8_t *ptr = (uint8_t*)malloc(size);
46   if (!ptr)
47      return NULL;
48
49   size_t accum = base_size;
50   for (unsigned i = 0; i < member_count; i++) {
51      *members[i] = (void*)(ptr + accum);
52      accum += member_sizes[i];
53   }
54   return (void*)ptr;
55}
56
57static inline void *
58ptrzalloc(size_t base_size, unsigned member_count, size_t *member_sizes, void ***members)
59{
60   size_t size = base_size;
61   for (unsigned i = 0; i < member_count; i++)
62      size += member_sizes[i];
63
64   uint8_t *ptr = (uint8_t*)calloc(1, size);
65   if (!ptr)
66      return NULL;
67
68   size_t accum = base_size;
69   for (unsigned i = 0; i < member_count; i++) {
70      *members[i] = (void*)(ptr + accum);
71      accum += member_sizes[i];
72   }
73   return (void*)ptr;
74}
75
76#ifdef __cplusplus
77}
78#endif
79