stdint.h 文件 int8_t uint8_t int16_t uint16_t

http://blog.chinaunix.net/uid-26588712-id-3068151.html

c++ 数据类型

按照posix标准，一般整型对应的*_t类型为：
1字节     uint8_t
2字节     uint16_t
4字节     uint32_t
8字节     uint64_t

1. /* Copyright (C) 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
2. This file is part of the GNU C Library.
3. The GNU C Library is free software; you can redistribute it and/or
4. modify it under the terms of the GNU Lesser General Public
5. License as published by the Free Software Foundation; either
6. version 2.1 of the License, or (at your option) any later version.
7. The GNU C Library is distributed in the hope that it will be useful,
8. but WITHOUT ANY WARRANTY; without even the implied warranty of
9. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
10. Lesser General Public License for more details.
11. You should have received a copy of the GNU Lesser General Public
12. License along with the GNU C Library; if not, write to the Free
13. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
14. 02111-1307 USA. */
15. /*
16. * ISO C99: 7.18 Integer types <stdint.h>
17. */
18. #ifndef _STDINT_H
19. #define _STDINT_H 1
20. #include <features.h>
21. #include <bits/wchar.h>
22. #include <bits/wordsize.h>
23. /* Exact integral types. */
24. /* Signed. */
25. /* There is some amount of overlap with <sys/types.h> as known by inet code */
26. #ifndef __int8_t_defined
27. # define __int8_t_defined
28. typedef signed char int8_t;
29. typedef short int int16_t;
30. typedef int int32_t;
31. # if __WORDSIZE == 64
32. typedef long int int64_t;
33. # else
34. __extension__
35. typedef long long int int64_t;
36. # endif
37. #endif
38. /* Unsigned. */
39. typedef unsigned char uint8_t;
40. typedef unsigned short int uint16_t;
41. #ifndef __uint32_t_defined
42. typedef unsigned int uint32_t;
43. # define __uint32_t_defined
44. #endif
45. #if __WORDSIZE == 64
46. typedef unsigned long int uint64_t;
47. #else
48. __extension__
49. typedef unsigned long long int uint64_t;
50. #endif
51. /* Small types. */
52. /* Signed. */
53. typedef signed char int_least8_t;
54. typedef short int int_least16_t;
55. typedef int int_least32_t;
56. #if __WORDSIZE == 64
57. typedef long int int_least64_t;
58. #else
59. __extension__
60. typedef long long int int_least64_t;
61. #endif
62. /* Unsigned. */
63. typedef unsigned char uint_least8_t;
64. typedef unsigned short int uint_least16_t;
65. typedef unsigned int uint_least32_t;
66. #if __WORDSIZE == 64
67. typedef unsigned long int uint_least64_t;
68. #else
69. __extension__
70. typedef unsigned long long int uint_least64_t;
71. #endif
72. /* Fast types. */
73. /* Signed. */
74. typedef signed char int_fast8_t;
75. #if __WORDSIZE == 64
76. typedef long int int_fast16_t;
77. typedef long int int_fast32_t;
78. typedef long int int_fast64_t;
79. #else
80. typedef int int_fast16_t;
81. typedef int int_fast32_t;
82. __extension__
83. typedef long long int int_fast64_t;
84. #endif
85. /* Unsigned. */
86. typedef unsigned char uint_fast8_t;
87. #if __WORDSIZE == 64
88. typedef unsigned long int uint_fast16_t;
89. typedef unsigned long int uint_fast32_t;
90. typedef unsigned long int uint_fast64_t;
91. #else
92. typedef unsigned int uint_fast16_t;
93. typedef unsigned int uint_fast32_t;
94. __extension__
95. typedef unsigned long long int uint_fast64_t;
96. #endif
97. /* Types for `void *' pointers. */
98. #if __WORDSIZE == 64
99. # ifndef __intptr_t_defined
100. typedef long int intptr_t;
101. # define __intptr_t_defined
102. # endif
103. typedef unsigned long int uintptr_t;
104. #else
105. # ifndef __intptr_t_defined
106. typedef int intptr_t;
107. # define __intptr_t_defined
108. # endif
109. typedef unsigned int uintptr_t;
110. #endif
111. /* Largest integral types. */
112. #if __WORDSIZE == 64
113. typedef long int intmax_t;
114. typedef unsigned long int uintmax_t;
115. #else
116. __extension__
117. typedef long long int intmax_t;
118. __extension__
119. typedef unsigned long long int uintmax_t;
120. #endif
121. /* The ISO C99 standard specifies that in C++ implementations these
122. macros should only be defined if explicitly requested. */
123. #if !defined __cplusplus || defined __STDC_LIMIT_MACROS
124. # if __WORDSIZE == 64
125. # define __INT64_C(c) c ## L
126. # define __UINT64_C(c) c ## UL
127. # else
128. # define __INT64_C(c) c ## LL
129. # define __UINT64_C(c) c ## ULL
130. # endif
131. /* Limits of integral types. */
132. /* Minimum of signed integral types. */
133. # define INT8_MIN (-128)
134. # define INT16_MIN (-32767-1)
135. # define INT32_MIN (-2147483647-1)
136. # define INT64_MIN (-__INT64_C(9223372036854775807)-1)
137. /* Maximum of signed integral types. */
138. # define INT8_MAX (127)
139. # define INT16_MAX (32767)
140. # define INT32_MAX (2147483647)
141. # define INT64_MAX (__INT64_C(9223372036854775807))
142. /* Maximum of unsigned integral types. */
143. # define UINT8_MAX (255)
144. # define UINT16_MAX (65535)
145. # define UINT32_MAX (4294967295U)
146. # define UINT64_MAX (__UINT64_C(18446744073709551615))
147. /* Minimum of signed integral types having a minimum size. */
148. # define INT_LEAST8_MIN (-128)
149. # define INT_LEAST16_MIN (-32767-1)
150. # define INT_LEAST32_MIN (-2147483647-1)
151. # define INT_LEAST64_MIN (-__INT64_C(9223372036854775807)-1)
152. /* Maximum of signed integral types having a minimum size. */
153. # define INT_LEAST8_MAX (127)
154. # define INT_LEAST16_MAX (32767)
155. # define INT_LEAST32_MAX (2147483647)
156. # define INT_LEAST64_MAX (__INT64_C(9223372036854775807))
157. /* Maximum of unsigned integral types having a minimum size. */
158. # define UINT_LEAST8_MAX (255)
159. # define UINT_LEAST16_MAX (65535)
160. # define UINT_LEAST32_MAX (4294967295U)
161. # define UINT_LEAST64_MAX (__UINT64_C(18446744073709551615))
162. /* Minimum of fast signed integral types having a minimum size. */
163. # define INT_FAST8_MIN (-128)
164. # if __WORDSIZE == 64
165. # define INT_FAST16_MIN (-9223372036854775807L-1)
166. # define INT_FAST32_MIN (-9223372036854775807L-1)
167. # else
168. # define INT_FAST16_MIN (-2147483647-1)
169. # define INT_FAST32_MIN (-2147483647-1)
170. # endif
171. # define INT_FAST64_MIN (-__INT64_C(9223372036854775807)-1)
172. /* Maximum of fast signed integral types having a minimum size. */
173. # define INT_FAST8_MAX (127)
174. # if __WORDSIZE == 64
175. # define INT_FAST16_MAX (9223372036854775807L)
176. # define INT_FAST32_MAX (9223372036854775807L)
177. # else
178. # define INT_FAST16_MAX (2147483647)
179. # define INT_FAST32_MAX (2147483647)
180. # endif
181. # define INT_FAST64_MAX (__INT64_C(9223372036854775807))
182. /* Maximum of fast unsigned integral types having a minimum size. */
183. # define UINT_FAST8_MAX (255)
184. # if __WORDSIZE == 64
185. # define UINT_FAST16_MAX (18446744073709551615UL)
186. # define UINT_FAST32_MAX (18446744073709551615UL)
187. # else
188. # define UINT_FAST16_MAX (4294967295U)
189. # define UINT_FAST32_MAX (4294967295U)
190. # endif
191. # define UINT_FAST64_MAX (__UINT64_C(18446744073709551615))
192. /* Values to test for integral types holding `void *' pointer. */
193. # if __WORDSIZE == 64
194. # define INTPTR_MIN (-9223372036854775807L-1)
195. # define INTPTR_MAX (9223372036854775807L)
196. # define UINTPTR_MAX (18446744073709551615UL)
197. # else
198. # define INTPTR_MIN (-2147483647-1)
199. # define INTPTR_MAX (2147483647)
200. # define UINTPTR_MAX (4294967295U)
201. # endif
202. /* Minimum for largest signed integral type. */
203. # define INTMAX_MIN (-__INT64_C(9223372036854775807)-1)
204. /* Maximum for largest signed integral type. */
205. # define INTMAX_MAX (__INT64_C(9223372036854775807))
206. /* Maximum for largest unsigned integral type. */
207. # define UINTMAX_MAX (__UINT64_C(18446744073709551615))
208. /* Limits of other integer types. */
209. /* Limits of `ptrdiff_t' type. */
210. # if __WORDSIZE == 64
211. # define PTRDIFF_MIN (-9223372036854775807L-1)
212. # define PTRDIFF_MAX (9223372036854775807L)
213. # else
214. # define PTRDIFF_MIN (-2147483647-1)
215. # define PTRDIFF_MAX (2147483647)
216. # endif
217. /* Limits of `sig_atomic_t'. */
218. # define SIG_ATOMIC_MIN (-2147483647-1)
219. # define SIG_ATOMIC_MAX (2147483647)
220. /* Limit of `size_t' type. */
221. # if __WORDSIZE == 64
222. # define SIZE_MAX (18446744073709551615UL)
223. # else
224. # define SIZE_MAX (4294967295U)
225. # endif
226. /* Limits of `wchar_t'. */
227. # ifndef WCHAR_MIN
228. /* These constants might also be defined in <wchar.h>. */
229. # define WCHAR_MIN __WCHAR_MIN
230. # define WCHAR_MAX __WCHAR_MAX
231. # endif
232. /* Limits of `wint_t'. */
233. # define WINT_MIN (0u)
234. # define WINT_MAX (4294967295u)
235. #endif /* C++ && limit macros */
236. /* The ISO C99 standard specifies that in C++ implementations these
237. should only be defined if explicitly requested. */
238. #if !defined __cplusplus || defined __STDC_CONSTANT_MACROS
239. /* Signed. */
240. # define INT8_C(c) c
241. # define INT16_C(c) c
242. # define INT32_C(c) c
243. # if __WORDSIZE == 64
244. # define INT64_C(c) c ## L
245. # else
246. # define INT64_C(c) c ## LL
247. # endif
248. /* Unsigned. */
249. # define UINT8_C(c) c ## U
250. # define UINT16_C(c) c ## U
251. # define UINT32_C(c) c ## U
252. # if __WORDSIZE == 64
253. # define UINT64_C(c) c ## UL
254. # else
255. # define UINT64_C(c) c ## ULL
256. # endif
257. /* Maximal type. */
258. # if __WORDSIZE == 64
259. # define INTMAX_C(c) c ## L
260. # define UINTMAX_C(c) c ## UL
261. # else
262. # define INTMAX_C(c) c ## LL
263. # define UINTMAX_C(c) c ## ULL
264. # endif
265. #endif /* C++ && constant macros */
266. #endif /* stdint.h */