一般来说,一个C的工程中一定要做一些这方面的工作,因为你会涉及到跨平台,不同的平台会有不同的字长,所以利用预编译和typedef可以让你最有效的维护你的代码。为了用户的方便,C99标准的C语言硬件为我们定义了这些类型,我们放心使用就可以了。 按照posix标准,一般整形对应的*_t类型为:
stdint.h源码:
1 /* Created by hwli <[email protected]> */ 2 #ifndef _STDINT_H 3 #define _STDINT_H 4 5 // Define C99 equivalent types. 6 typedef signed char int8_t; 7 typedef signed short int16_t; 8 typedef signed int int32_t; 9 typedef signed long long int64_t; 10 11 typedef unsigned char uint8_t; 12 typedef unsigned short uint16_t; 13 typedef unsigned int uint32_t; 14 typedef unsigned long long uint64_t; 15 typedef enum 16 { 17 FALSE = 0, 18 TRUE = 1, 19 } bool; 20 21 #define INT8_MIN (-128) 22 #define INT16_MIN (-32768) 23 #define INT32_MIN (-2147483647 - 1) 24 #define INT64_MIN (-9223372036854775807LL - 1) 25 26 #define INT8_MAX 127 27 #define INT16_MAX 32767 28 #define INT32_MAX 2147483647 29 #define INT64_MAX 9223372036854775807LL 30 31 #define UINT8_MAX 0xff /* 255U */ 32 #define UINT16_MAX 0xffff /* 65535U */ 33 #define UINT32_MAX 0xffffffff /* 4294967295U */ 34 #define UINT64_MAX 0xffffffffffffffffULL /* 18446744073709551615ULL */ 35 36 #endif //_STDINT_H