1 /*
2  * Copyright (c) 2016-2020, Yann Collet, Facebook, Inc.
3  * All rights reserved.
4  *
5  * This source code is licensed under both the BSD-style license (found in the
6  * LICENSE file in the root directory of this source tree) and the GPLv2 (found
7  * in the COPYING file in the root directory of this source tree).
8  * You may select, at your option, one of the above-listed licenses.
9  */
10 
11 /* Note : this module is expected to remain private, do not expose it */
12 
13 #ifndef ERROR_H_MODULE
14 #define ERROR_H_MODULE
15 
16 #if defined (__cplusplus)
17 extern "C" {
18 #endif
19 
20 
21 /* ****************************************
22 *  Dependencies
23 ******************************************/
24 #include <stddef.h>        /* size_t */
25 #include "zstd_errors.h"  /* enum list */
26 
27 
28 /* ****************************************
29 *  Compiler-specific
30 ******************************************/
31 #if defined(__GNUC__)
32 #  define ERR_STATIC static __attribute__((unused))
33 #elif defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
34 #  define ERR_STATIC static inline
35 #elif defined(_MSC_VER)
36 #  define ERR_STATIC static __inline
37 #else
38 #  define ERR_STATIC static  /* this version may generate warnings for unused static functions; disable the relevant warning */
39 #endif
40 
41 
42 /*-****************************************
43 *  Customization (error_public.h)
44 ******************************************/
45 typedef ZSTD_ErrorCode ERR_enum;
46 #define PREFIX(name) ZSTD_error_##name
47 
48 
49 /*-****************************************
50 *  Error codes handling
51 ******************************************/
52 #undef ERROR   /* already defined on Visual Studio */
53 #define ERROR(name) ZSTD_ERROR(name)
54 #define ZSTD_ERROR(name) ((size_t)-PREFIX(name))
55 
56 ERR_STATIC unsigned ERR_isError(size_t code) { return (code > ERROR(maxCode)); }
57 
58 ERR_STATIC ERR_enum ERR_getErrorCode(size_t code) { if (!ERR_isError(code)) return (ERR_enum)0; return (ERR_enum) (0-code); }
59 
60 /* check and forward error code */
61 #define CHECK_V_F(e, f) size_t const e = f; if (ERR_isError(e)) return e
62 #define CHECK_F(f)   { CHECK_V_F(_var_err__, f); }
63 
64 
65 /*-****************************************
66 *  Error Strings
67 ******************************************/
68 
69 const char* ERR_getErrorString(ERR_enum code);   /* error_private.c */
70 
71 ERR_STATIC const char* ERR_getErrorName(size_t code)
72 {
73     return ERR_getErrorString(ERR_getErrorCode(code));
74 }
75 
76 #if defined (__cplusplus)
77 }
78 #endif
79 
80 #endif /* ERROR_H_MODULE */
81