/*lsp getc() 함수 예제 172p*/
/*ssu_getc.c*/
/*20162468 박다은*/

#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h> //gettimeofday

int main()
{
    struct timeval A, B, C; //시간을 비교할 값들
    gettimeofday(&A, NULL);
    //=======================================

    int character;

    while((character = getc(stdin)) != EOF) //EOF가 들어올떄까지 계속 입력받음
        if(putc(character, stdout) == EOF){
            fprintf(stderr, "standard output error\n");
            exit(1);
        }

    if(ferror(stdin)){
        fprintf(stderr, "standard input error\n");
        exit(1);
    }

    //=======================================
    gettimeofday(&B, NULL);

    C.tv_sec = B.tv_sec - A.tv_sec;
    C.tv_usec = B.tv_usec - A.tv_usec;
    if(C.tv_usec < 0){
        C.tv_sec -= 1;
        C.tv_usec += 1000000;
    }
    printf("ROLLCAKE::Running Time : %ld µs\n", C.tv_sec*1000000 + C.tv_usec); //작은 프로그램이므로 마이크로초로 계산
    exit(0);
}