Linux数据类型(通用移植)

本文参考:
https://blog.csdn.net/smallfish_love/article/details/50782905

arm平台下的数据类型重定义

typedef char                s8;
typedef unsigned char       u8;
typedef short               s16;
typedef unsigned short      u16;
typedef int                 s32;
typedef unsigned    int     u32;
typedef float               f32;
typedef signed long long    s64;
typedef unsigned long long  u64;

ppc平台下的数据类型重定义

typedef signed char      s8;
typedef unsigned char    u8;
typedef signed short     s16;
typedef unsigned short   u16;
typedef signed int       s32;
typedef unsigned int     u32;
typedef signed long      s64;
typedef unsigned long    u64;

由于以上数据类型是针对不同体系结构定义的,因此在任何平台下对其用sizeof运算的结果是不变的,是确定长度的数据类型。
但是以上这些数据类型只能在内核空间使用,在Linux用户空间中,如果要使用确定长度的数据类型,应该使用上述类型加“__(双下划线)”版本,如__u32、__u16、__u8。其余Linux中还存在_t后缀的重定义数据类型。

代码:


#include <stdbool.h>
#include <stdint.h>
#include <string.h>
#include <signal.h>
#include <stdio.h>

typedef char                s8;
typedef unsigned char       u8;
typedef short               s16;
typedef unsigned short      u16;
typedef int                 s32;
typedef unsigned    int     u32;
typedef float               f32;
typedef signed long long    s64;
typedef unsigned long long  u64;

int main(int argc, const char * argv[]) {

    printf("s8:%d\n",sizeof(s8));
    printf("u8:%d\n",sizeof(u8));
    printf("s16:%d\n",sizeof(s16));
    printf("u16:%d\n",sizeof(u16));
    printf("s32:%d\n",sizeof(s32));
    printf("u32:%d\n",sizeof(u32));
    printf("s64:%d\n",sizeof(s64));
    printf("u64:%d\n",sizeof(u64));

    printf("unsigned long:%d\n",sizeof(unsigned long));
    return 0;
}

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转载自blog.csdn.net/u013457167/article/details/80246629
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