1/****************************************************************************
2**
3** Copyright (C) 2017 Intel Corporation
4**
5** Permission is hereby granted, free of charge, to any person obtaining a copy
6** of this software and associated documentation files (the "Software"), to deal
7** in the Software without restriction, including without limitation the rights
8** to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9** copies of the Software, and to permit persons to whom the Software is
10** furnished to do so, subject to the following conditions:
11**
12** The above copyright notice and this permission notice shall be included in
13** all copies or substantial portions of the 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 THE
18** AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19** LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20** OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
21** THE SOFTWARE.
22**
23****************************************************************************/
24
25#ifndef COMPILERSUPPORT_H
26#define COMPILERSUPPORT_H
27
28#include "cbor.h"
29
30#ifndef _BSD_SOURCE
31# define _BSD_SOURCE
32#endif
33#ifndef _DEFAULT_SOURCE
34# define _DEFAULT_SOURCE
35#endif
36#ifndef assert
37# include <assert.h>
38#endif
39#include <stddef.h>
40#include <stdint.h>
41#include <string.h>
42
43#ifndef __cplusplus
44# include <stdbool.h>
45#endif
46
47#if __STDC_VERSION__ >= 201112L || __cplusplus >= 201103L || __cpp_static_assert >= 200410
48# define cbor_static_assert(x) static_assert(x, #x)
49#elif !defined(__cplusplus) && defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 406) && (__STDC_VERSION__ > 199901L)
50# define cbor_static_assert(x) _Static_assert(x, #x)
51#else
52# define cbor_static_assert(x) ((void)sizeof(char[2*!!(x) - 1]))
53#endif
54#if __STDC_VERSION__ >= 199901L || defined(__cplusplus)
55/* inline is a keyword */
56#else
57/* use the definition from cbor.h */
58# define inline CBOR_INLINE
59#endif
60
61#ifdef NDEBUG
62# define cbor_assert(cond) do { if (!(cond)) unreachable(); } while (0)
63#else
64# define cbor_assert(cond) assert(cond)
65#endif
66
67#ifndef STRINGIFY
68#define STRINGIFY(x) STRINGIFY2(x)
69#endif
70#define STRINGIFY2(x) #x
71
72#if !defined(UINT32_MAX) || !defined(INT64_MAX)
73/* C89? We can define UINT32_MAX portably, but not INT64_MAX */
74# error "Your system has stdint.h but that doesn't define UINT32_MAX or INT64_MAX"
75#endif
76
77#ifndef DBL_DECIMAL_DIG
78/* DBL_DECIMAL_DIG is C11 */
79# define DBL_DECIMAL_DIG 17
80#endif
81#define DBL_DECIMAL_DIG_STR STRINGIFY(DBL_DECIMAL_DIG)
82
83#if defined(__GNUC__) && defined(__i386__) && !defined(__iamcu__)
84# define CBOR_INTERNAL_API_CC __attribute__((regparm(3)))
85#elif defined(_MSC_VER) && defined(_M_IX86)
86# define CBOR_INTERNAL_API_CC __fastcall
87#else
88# define CBOR_INTERNAL_API_CC
89#endif
90
91#ifndef __has_builtin
92# define __has_builtin(x) 0
93#endif
94
95#if (defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 403)) || \
96 (__has_builtin(__builtin_bswap64) && __has_builtin(__builtin_bswap32))
97# if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
98# define cbor_ntohll __builtin_bswap64
99# define cbor_htonll __builtin_bswap64
100# define cbor_ntohl __builtin_bswap32
101# define cbor_htonl __builtin_bswap32
102# ifdef __INTEL_COMPILER
103# define cbor_ntohs _bswap16
104# define cbor_htons _bswap16
105# elif (__GNUC__ * 100 + __GNUC_MINOR__ >= 608) || __has_builtin(__builtin_bswap16)
106# define cbor_ntohs __builtin_bswap16
107# define cbor_htons __builtin_bswap16
108# else
109# define cbor_ntohs(x) (((uint16_t)(x) >> 8) | ((uint16_t)(x) << 8))
110# define cbor_htons cbor_ntohs
111# endif
112# else
113# define cbor_ntohll
114# define cbor_htonll
115# define cbor_ntohl
116# define cbor_htonl
117# define cbor_ntohs
118# define cbor_htons
119# endif
120#elif defined(__sun)
121# include <sys/byteorder.h>
122#elif defined(_MSC_VER)
123/* MSVC, which implies Windows, which implies little-endian and sizeof(long) == 4 */
124# include <stdlib.h>
125# define cbor_ntohll _byteswap_uint64
126# define cbor_htonll _byteswap_uint64
127# define cbor_ntohl _byteswap_ulong
128# define cbor_htonl _byteswap_ulong
129# define cbor_ntohs _byteswap_ushort
130# define cbor_htons _byteswap_ushort
131#endif
132#ifndef cbor_ntohs
133# include <arpa/inet.h>
134# define cbor_ntohs ntohs
135# define cbor_htons htons
136#endif
137#ifndef cbor_ntohl
138# include <arpa/inet.h>
139# define cbor_ntohl ntohl
140# define cbor_htonl htonl
141#endif
142#ifndef cbor_ntohll
143# define cbor_ntohll ntohll
144# define cbor_htonll htonll
145/* ntohll isn't usually defined */
146# ifndef ntohll
147# if (defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) || \
148 (defined(__BYTE_ORDER) && defined(__BIG_ENDIAN) && __BYTE_ORDER == __BIG_ENDIAN) || \
149 (defined(BYTE_ORDER) && defined(BIG_ENDIAN) && BYTE_ORDER == BIG_ENDIAN) || \
150 (defined(_BIG_ENDIAN) && !defined(_LITTLE_ENDIAN)) || (defined(__BIG_ENDIAN__) && !defined(__LITTLE_ENDIAN__)) || \
151 defined(__ARMEB__) || defined(__MIPSEB__) || defined(__s390__) || defined(__sparc__)
152# define ntohll
153# define htonll
154# elif (defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) || \
155 (defined(__BYTE_ORDER) && defined(__LITTLE_ENDIAN) && __BYTE_ORDER == __LITTLE_ENDIAN) || \
156 (defined(BYTE_ORDER) && defined(LITTLE_ENDIAN) && BYTE_ORDER == LITTLE_ENDIAN) || \
157 defined(_LITTLE_ENDIAN) || defined(__LITTLE_ENDIAN__) || defined(__ARMEL__) || defined(__MIPSEL__) || \
158 defined(__i386) || defined(__i386__) || defined(__x86_64) || defined(__x86_64__) || defined(__amd64)
159# define ntohll(x) ((ntohl((uint32_t)(x)) * UINT64_C(0x100000000)) + (ntohl((x) >> 32)))
160# define htonll ntohll
161# else
162# error "Unable to determine byte order!"
163# endif
164# endif
165#endif
166
167
168#ifdef __cplusplus
169# define CONST_CAST(t, v) const_cast<t>(v)
170#else
171/* C-style const_cast without triggering a warning with -Wcast-qual */
172# define CONST_CAST(t, v) (t)(uintptr_t)(v)
173#endif
174
175#ifdef __GNUC__
176#ifndef likely
177# define likely(x) __builtin_expect(!!(x), 1)
178#endif
179#ifndef unlikely
180# define unlikely(x) __builtin_expect(!!(x), 0)
181#endif
182# define unreachable() __builtin_unreachable()
183#elif defined(_MSC_VER)
184# define likely(x) (x)
185# define unlikely(x) (x)
186# define unreachable() __assume(0)
187#else
188# define likely(x) (x)
189# define unlikely(x) (x)
190# define unreachable() do {} while (0)
191#endif
192
193static inline bool add_check_overflow(size_t v1, size_t v2, size_t *r)
194{
195#if ((defined(__GNUC__) && (__GNUC__ >= 5)) && !defined(__INTEL_COMPILER)) || __has_builtin(__builtin_add_overflow)
196 return __builtin_add_overflow(v1, v2, r);
197#else
198 /* unsigned additions are well-defined */
199 *r = v1 + v2;
200 return v1 > v1 + v2;
201#endif
202}
203
204#endif /* COMPILERSUPPORT_H */
205
206