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.
  4. The GNU C Library is free software; you can redistribute it and/or
  5. modify it under the terms of the GNU Lesser General Public
  6. License as published by the Free Software Foundation; either
  7. version 2.1 of the License, or (at your option) any later version.
  9. The GNU C Library is distributed in the hope that it will be useful,
  10. but WITHOUT ANY WARRANTY; without even the implied warranty of
  11. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12. Lesser General Public License for more details.
  14. You should have received a copy of the GNU Lesser General Public
  15. License along with the GNU C Library; if not, write to the Free
  16. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17. 02111-1307 USA. */
  19. /*
  20. * ISO C99: 7.18 Integer types <stdint.h>
  21. */
  23. #ifndef _STDINT_H
  24. #define _STDINT_H 1
  26. #include <features.h>
  27. #include <bits/wchar.h>
  28. #include <bits/wordsize.h>
  30. /* Exact integral types. */
  32. /* Signed. */
  34. /* There is some amount of overlap with <sys/types.h> as known by inet code */
  35. #ifndef __int8_t_defined
  36. # define __int8_t_defined
  37. typedef signed char int8_t;
  38. typedef short int int16_t;
  39. typedef int int32_t;
  40. # if __WORDSIZE == 64
  41. typedef long int int64_t;
  42. # else
  43. __extension__
  44. typedef long long int int64_t;
  45. # endif
  46. #endif
  48. /* Unsigned. */
  49. typedef unsigned char uint8_t;
  50. typedef unsigned short int uint16_t;
  51. #ifndef __uint32_t_defined
  52. typedef unsigned int uint32_t;
  53. # define __uint32_t_defined
  54. #endif
  55. #if __WORDSIZE == 64
  56. typedef unsigned long int uint64_t;
  57. #else
  58. __extension__
  59. typedef unsigned long long int uint64_t;
  60. #endif
  63. /* Small types. */
  65. /* Signed. */
  66. typedef signed char int_least8_t;
  67. typedef short int int_least16_t;
  68. typedef int int_least32_t;
  69. #if __WORDSIZE == 64
  70. typedef long int int_least64_t;
  71. #else
  72. __extension__
  73. typedef long long int int_least64_t;
  74. #endif
  76. /* Unsigned. */
  77. typedef unsigned char uint_least8_t;
  78. typedef unsigned short int uint_least16_t;
  79. typedef unsigned int uint_least32_t;
  80. #if __WORDSIZE == 64
  81. typedef unsigned long int uint_least64_t;
  82. #else
  83. __extension__
  84. typedef unsigned long long int uint_least64_t;
  85. #endif
  88. /* Fast types. */
  90. /* Signed. */
  91. typedef signed char int_fast8_t;
  92. #if __WORDSIZE == 64
  93. typedef long int int_fast16_t;
  94. typedef long int int_fast32_t;
  95. typedef long int int_fast64_t;
  96. #else
  97. typedef int int_fast16_t;
  98. typedef int int_fast32_t;
  99. __extension__
  100. typedef long long int int_fast64_t;
  101. #endif
  103. /* Unsigned. */
  104. typedef unsigned char uint_fast8_t;
  105. #if __WORDSIZE == 64
  106. typedef unsigned long int uint_fast16_t;
  107. typedef unsigned long int uint_fast32_t;
  108. typedef unsigned long int uint_fast64_t;
  109. #else
  110. typedef unsigned int uint_fast16_t;
  111. typedef unsigned int uint_fast32_t;
  112. __extension__
  113. typedef unsigned long long int uint_fast64_t;
  114. #endif
  117. /* Types for `void *' pointers. */
  118. #if __WORDSIZE == 64
  119. # ifndef __intptr_t_defined
  120. typedef long int intptr_t;
  121. # define __intptr_t_defined
  122. # endif
  123. typedef unsigned long int uintptr_t;
  124. #else
  125. # ifndef __intptr_t_defined
  126. typedef int intptr_t;
  127. # define __intptr_t_defined
  128. # endif
  129. typedef unsigned int uintptr_t;
  130. #endif
  133. /* Largest integral types. */
  134. #if __WORDSIZE == 64
  135. typedef long int intmax_t;
  136. typedef unsigned long int uintmax_t;
  137. #else
  138. __extension__
  139. typedef long long int intmax_t;
  140. __extension__
  141. typedef unsigned long long int uintmax_t;
  142. #endif
  145. /* The ISO C99 standard specifies that in C++ implementations these
  146. macros should only be defined if explicitly requested. */
  147. #if !defined __cplusplus || defined __STDC_LIMIT_MACROS
  149. # if __WORDSIZE == 64
  150. # define __INT64_C(c) c ## L
  151. # define __UINT64_C(c) c ## UL
  152. # else
  153. # define __INT64_C(c) c ## LL
  154. # define __UINT64_C(c) c ## ULL
  155. # endif
  157. /* Limits of integral types. */
  159. /* Minimum of signed integral types. */
  160. # define INT8_MIN (-128)
  161. # define INT16_MIN (-32767-1)
  162. # define INT32_MIN (-2147483647-1)
  163. # define INT64_MIN (-__INT64_C(9223372036854775807)-1)
  164. /* Maximum of signed integral types. */
  165. # define INT8_MAX (127)
  166. # define INT16_MAX (32767)
  167. # define INT32_MAX (2147483647)
  168. # define INT64_MAX (__INT64_C(9223372036854775807))
  170. /* Maximum of unsigned integral types. */
  171. # define UINT8_MAX (255)
  172. # define UINT16_MAX (65535)
  173. # define UINT32_MAX (4294967295U)
  174. # define UINT64_MAX (__UINT64_C(18446744073709551615))
  177. /* Minimum of signed integral types having a minimum size. */
  178. # define INT_LEAST8_MIN (-128)
  179. # define INT_LEAST16_MIN (-32767-1)
  180. # define INT_LEAST32_MIN (-2147483647-1)
  181. # define INT_LEAST64_MIN (-__INT64_C(9223372036854775807)-1)
  182. /* Maximum of signed integral types having a minimum size. */
  183. # define INT_LEAST8_MAX (127)
  184. # define INT_LEAST16_MAX (32767)
  185. # define INT_LEAST32_MAX (2147483647)
  186. # define INT_LEAST64_MAX (__INT64_C(9223372036854775807))
  188. /* Maximum of unsigned integral types having a minimum size. */
  189. # define UINT_LEAST8_MAX (255)
  190. # define UINT_LEAST16_MAX (65535)
  191. # define UINT_LEAST32_MAX (4294967295U)
  192. # define UINT_LEAST64_MAX (__UINT64_C(18446744073709551615))
  195. /* Minimum of fast signed integral types having a minimum size. */
  196. # define INT_FAST8_MIN (-128)
  197. # if __WORDSIZE == 64
  198. # define INT_FAST16_MIN (-9223372036854775807L-1)
  199. # define INT_FAST32_MIN (-9223372036854775807L-1)
  200. # else
  201. # define INT_FAST16_MIN (-2147483647-1)
  202. # define INT_FAST32_MIN (-2147483647-1)
  203. # endif
  204. # define INT_FAST64_MIN (-__INT64_C(9223372036854775807)-1)
  205. /* Maximum of fast signed integral types having a minimum size. */
  206. # define INT_FAST8_MAX (127)
  207. # if __WORDSIZE == 64
  208. # define INT_FAST16_MAX (9223372036854775807L)
  209. # define INT_FAST32_MAX (9223372036854775807L)
  210. # else
  211. # define INT_FAST16_MAX (2147483647)
  212. # define INT_FAST32_MAX (2147483647)
  213. # endif
  214. # define INT_FAST64_MAX (__INT64_C(9223372036854775807))
  216. /* Maximum of fast unsigned integral types having a minimum size. */
  217. # define UINT_FAST8_MAX (255)
  218. # if __WORDSIZE == 64
  219. # define UINT_FAST16_MAX (18446744073709551615UL)
  220. # define UINT_FAST32_MAX (18446744073709551615UL)
  221. # else
  222. # define UINT_FAST16_MAX (4294967295U)
  223. # define UINT_FAST32_MAX (4294967295U)
  224. # endif
  225. # define UINT_FAST64_MAX (__UINT64_C(18446744073709551615))
  228. /* Values to test for integral types holding `void *' pointer. */
  229. # if __WORDSIZE == 64
  230. # define INTPTR_MIN (-9223372036854775807L-1)
  231. # define INTPTR_MAX (9223372036854775807L)
  232. # define UINTPTR_MAX (18446744073709551615UL)
  233. # else
  234. # define INTPTR_MIN (-2147483647-1)
  235. # define INTPTR_MAX (2147483647)
  236. # define UINTPTR_MAX (4294967295U)
  237. # endif
  240. /* Minimum for largest signed integral type. */
  241. # define INTMAX_MIN (-__INT64_C(9223372036854775807)-1)
  242. /* Maximum for largest signed integral type. */
  243. # define INTMAX_MAX (__INT64_C(9223372036854775807))
  245. /* Maximum for largest unsigned integral type. */
  246. # define UINTMAX_MAX (__UINT64_C(18446744073709551615))
  249. /* Limits of other integer types. */
  251. /* Limits of `ptrdiff_t' type. */
  252. # if __WORDSIZE == 64
  253. # define PTRDIFF_MIN (-9223372036854775807L-1)
  254. # define PTRDIFF_MAX (9223372036854775807L)
  255. # else
  256. # define PTRDIFF_MIN (-2147483647-1)
  257. # define PTRDIFF_MAX (2147483647)
  258. # endif
  260. /* Limits of `sig_atomic_t'. */
  261. # define SIG_ATOMIC_MIN (-2147483647-1)
  262. # define SIG_ATOMIC_MAX (2147483647)
  264. /* Limit of `size_t' type. */
  265. # if __WORDSIZE == 64
  266. # define SIZE_MAX (18446744073709551615UL)
  267. # else
  268. # define SIZE_MAX (4294967295U)
  269. # endif
  271. /* Limits of `wchar_t'. */
  272. # ifndef WCHAR_MIN
  273. /* These constants might also be defined in <wchar.h>. */
  274. # define WCHAR_MIN __WCHAR_MIN
  275. # define WCHAR_MAX __WCHAR_MAX
  276. # endif
  278. /* Limits of `wint_t'. */
  279. # define WINT_MIN (0u)
  280. # define WINT_MAX (4294967295u)
  282. #endif /* C++ && limit macros */
  285. /* The ISO C99 standard specifies that in C++ implementations these
  286. should only be defined if explicitly requested. */
  287. #if !defined __cplusplus || defined __STDC_CONSTANT_MACROS
  289. /* Signed. */
  290. # define INT8_C(c) c
  291. # define INT16_C(c) c
  292. # define INT32_C(c) c
  293. # if __WORDSIZE == 64
  294. # define INT64_C(c) c ## L
  295. # else
  296. # define INT64_C(c) c ## LL
  297. # endif
  299. /* Unsigned. */
  300. # define UINT8_C(c) c ## U
  301. # define UINT16_C(c) c ## U
  302. # define UINT32_C(c) c ## U
  303. # if __WORDSIZE == 64
  304. # define UINT64_C(c) c ## UL
  305. # else
  306. # define UINT64_C(c) c ## ULL
  307. # endif
  309. /* Maximal type. */
  310. # if __WORDSIZE == 64
  311. # define INTMAX_C(c) c ## L
  312. # define UINTMAX_C(c) c ## UL
  313. # else
  314. # define INTMAX_C(c) c ## LL
  315. # define UINTMAX_C(c) c ## ULL
  316. # endif
  318. #endif /* C++ && constant macros */
  320. #endif /* stdint.h */
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原文地址：https://www.cnblogs.com/i80386/p/4635776.html