stdint.h 文件 int8_t uint8_t int16_t uint16_t （一）

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

 /* Copyright (C) 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
 This file is part of the GNU C Library.

 The GNU C Library is free software; you can redistribute it and/or
 modify it under the terms of the GNU Lesser General Public
 License as published by the Free Software Foundation; either
 version 2.1 of the License, or (at your option) any later version.

 The GNU C Library is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 Lesser General Public License for more details.

 You should have received a copy of the GNU Lesser General Public
 License along with the GNU C Library; if not, write to the Free
 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 02111-1307 USA. */

 /*
 * ISO C99: 7.18 Integer types
 */

 #ifndef _STDINT_H
 #define _STDINT_H   1

 #include
 #include
 #include

 /* Exact integral types. */

 /* Signed. */

 /* There is some amount of overlap with  as known by inet code */
 #ifndef __int8_t_defined
 # define __int8_t_defined
 typedef signed char     int8_t;
 typedef short int       int16_t;
 typedef int         int32_t;
 # if __WORDSIZE == 64
 typedef long int        int64_t;
 # else
 __extension__
 typedef long long int       int64_t;
 # endif
 #endif

 /* Unsigned. */
 typedef unsigned char       uint8_t;
 typedef unsigned short int uint16_t;
 #ifndef __uint32_t_defined
 typedef unsigned int        uint32_t;
 # define __uint32_t_defined
 #endif
 #if __WORDSIZE == 64
 typedef unsigned long int   uint64_t;
 #else
 __extension__
 typedef unsigned long long int uint64_t;
 #endif


 /* Small types. */

 /* Signed. */
 typedef signed char     int_least8_t;
 typedef short int       int_least16_t;
 typedef int         int_least32_t;
 #if __WORDSIZE == 64
 typedef long int        int_least64_t;
 #else
 __extension__
 typedef long long int       int_least64_t;
 #endif

 /* Unsigned. */
 typedef unsigned char       uint_least8_t;
 typedef unsigned short int uint_least16_t;
 typedef unsigned int        uint_least32_t;
 #if __WORDSIZE == 64
 typedef unsigned long int   uint_least64_t;
 #else
 __extension__
 typedef unsigned long long int uint_least64_t;
 #endif


 /* Fast types. */

 /* Signed. */
 typedef signed char     int_fast8_t;
 #if __WORDSIZE == 64
 typedef long int        int_fast16_t;
 typedef long int        int_fast32_t;
 typedef long int        int_fast64_t;
 #else
 typedef int         int_fast16_t;
 typedef int         int_fast32_t;
 __extension__
 typedef long long int       int_fast64_t;
 #endif

 /* Unsigned. */
 typedef unsigned char       uint_fast8_t;
 #if __WORDSIZE == 64
 typedef unsigned long int   uint_fast16_t;
 typedef unsigned long int   uint_fast32_t;
 typedef unsigned long int   uint_fast64_t;
 #else
 typedef unsigned int        uint_fast16_t;
 typedef unsigned int        uint_fast32_t;
 __extension__
 typedef unsigned long long int uint_fast64_t;
 #endif


 /* Types for `void *' pointers. */
 #if __WORDSIZE == 64
 # ifndef __intptr_t_defined
 typedef long int        intptr_t;
 # define __intptr_t_defined
 # endif
 typedef unsigned long int   uintptr_t;
 #else
 # ifndef __intptr_t_defined
 typedef int         intptr_t;
 # define __intptr_t_defined
 # endif
 typedef unsigned int        uintptr_t;
 #endif


 /* Largest integral types. */
 #if __WORDSIZE == 64
 typedef long int        intmax_t;
 typedef unsigned long int   uintmax_t;
 #else
 __extension__
 typedef long long int       intmax_t;
 __extension__
 typedef unsigned long long int uintmax_t;
 #endif