具体代码如下:

void mode_to_letters(int mode,char str[])

{

//S_IS***测试宏

strcpy(str,"----------");

if(S_ISDIR(mode))str[0] = 'd';

if(S_ISCHR(mode))str[0] = 'c';

if(S_ISBLK(mode))str[0] = 'b';

//与 掩码

if(mode&S_IRUSR)str[1] = 'r';

if(mode&S_IWUSR)str[2] = 'w';

if(mode&S_IXUSR)str[3] = 'x';

if(mode&S_IRGRP)str[4] = 'r';

if(mode&S_IWGRP)str[5] = 'w';

if(mode&S_IXGRP)str[6] = 'x';

if(mode&S_IROTH)str[7] = 'r';

if(mode&S_IWOTH)str[8] = 'w';

if(mode&S_IXOTH)str[9] = 'x';

}