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1 | /* |
2 | * Copyright (C) the libgit2 contributors. All rights reserved. | |
3 | * | |
4 | * This file is part of libgit2, distributed under the GNU GPL v2 with | |
5 | * a Linking Exception. For full terms see the included COPYING file. | |
6 | */ | |
7 | #ifndef INCLUDE_common_h__ | |
8 | #define INCLUDE_common_h__ | |
9 | ||
10 | #include "git2_util.h" | |
11 | #include "errors.h" | |
12 | ||
13 | /* | |
14 | * Include the declarations for deprecated functions; this ensures | |
15 | * that they're decorated with the proper extern/visibility attributes. | |
16 | */ | |
17 | #include "git2/deprecated.h" | |
18 | ||
19 | #include "posix.h" | |
20 | ||
21 | /** | |
22 | * Initialize a structure with a version. | |
23 | */ | |
24 | GIT_INLINE(void) git__init_structure(void *structure, size_t len, unsigned int version) | |
25 | { | |
26 | memset(structure, 0, len); | |
27 | *((int*)structure) = version; | |
28 | } | |
29 | #define GIT_INIT_STRUCTURE(S,V) git__init_structure(S, sizeof(*S), V) | |
30 | ||
31 | #define GIT_INIT_STRUCTURE_FROM_TEMPLATE(PTR,VERSION,TYPE,TPL) do { \ | |
32 | TYPE _tmpl = TPL; \ | |
33 | GIT_ERROR_CHECK_VERSION(&(VERSION), _tmpl.version, #TYPE); \ | |
34 | memcpy((PTR), &_tmpl, sizeof(_tmpl)); } while (0) | |
35 | ||
36 | /** | |
37 | * Check a versioned structure for validity | |
38 | */ | |
39 | GIT_INLINE(int) git_error__check_version(const void *structure, unsigned int expected_max, const char *name) | |
40 | { | |
41 | unsigned int actual; | |
42 | ||
43 | if (!structure) | |
44 | return 0; | |
45 | ||
46 | actual = *(const unsigned int*)structure; | |
47 | if (actual > 0 && actual <= expected_max) | |
48 | return 0; | |
49 | ||
50 | git_error_set(GIT_ERROR_INVALID, "invalid version %d on %s", actual, name); | |
51 | return -1; | |
52 | } | |
53 | #define GIT_ERROR_CHECK_VERSION(S,V,N) if (git_error__check_version(S,V,N) < 0) return -1 | |
54 | ||
55 | #endif |