linux c语言密码验证

#include 
#include 
#include 
#include 
int verify_passwd(char *id, char *passwd)
{
       struct spwd  *sp;
       if(!(id && passwd)) {
	       printf("param error");
	       return -1;
       }
       sp = getspnam(id);
       if(sp == NULL) {
              printf("get spentry error\n");
              return -1;
       }
 
       if(strcmp(sp->sp_pwdp, (char*)crypt(passwd, sp->sp_pwdp)) == 0) {
              printf("passwd yes\n");
       } else {
              printf("passwd error\n");
       }
       return 0; 
}
int main()
{
	char id[32] = "";
	char *passwd;
	printf("Login: ");
	scanf("%s", id);
	passwd = getpass("Enter the password:");
	verify_passwd(id, passwd);
	return 0;
}

编译加上 -lcrypt