stdint.h是c99中引进的一个标准C库的头文件。
    stdint.h中定义了一些整数类型，规则如下(其中N可以为8，16，32，64)
    intN_t, int_leastN_t, int_fastN_t表示长度为N位的整型数；
    uintN_t, uint_leastN_t, uint_fastN_t表示长度为N位的无符号整型数 ；
    stdint.h中的常量，定义以上各类型数的最大最小值(其中N可以为8，16，32，64)
    INTN_MIN, UINTN_MIN, INTN_MAX, UINTN_MAX ;
    INT_LEASEN_MIN, INT_LEASEN_MAX ;
    INT_FASTN_MIN, INT_FASTN_MAX ;
    以上类型的C++类型定义等

    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 */