strcmp函数实现(c语言)

strcmp函数实现(c语言)

second60 20180601

#include <stdio.h>
int strcmp_new(const char* src, const char* dst)
{
    int ret = 0;
    while( !(ret = *(unsigned char*)src - *(unsigned char*)dst) && *dst)
    {
        src ++;
        dst ++;
    }
    if( ret < 0) ret = -1;
    else if(ret > 0) ret = 1;
    return ret;
}

int main()
{
    char str[10] = "1234";
    char str1[10] = "1234";


    int ret1 = strcmp_new(str,str1);
    printf("ret=%d\n", ret1);
    getchar();
    return 0;
}