리눅스에서 c언어로 콘솔프로그램을 만들고있는데...

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <termios.h>
 
#define BUF_LEN 80
 
static struct termios orig_term;
 
static int set_erase(char);
static void tty_recover(void);
 
int main(){
    char str[BUF_LEN];
    size_t i, len;
 
    if(set_erase('\x08'))
        return 1;
 
    fgets(str, sizeof(str), stdin);
    printf("length = %u\nstr = ", (unsigned int)(len = strlen(str)));
    fputs(str, stdout);
    fputs("bytes dump:", stdout);
    for(i=0;i<len;i++){
        printf("\n%#02x " + !!(i&0xf), 0xff & str[i]);
    }
    fputc('\n', stdout);
    return 0;
}
 
int set_erase(char erase){
    struct termios term;
 
    if (isatty(STDIN_FILENO) == 0)
        return 1; // stdin is not a terminal device
 
    if (tcgetattr(STDIN_FILENO, &term) < 0)
        return 1; // tcgetattr error
 
    memcpy(&orig_term, &term, sizeof(struct termios));
    if(atexit(tty_recover))
        return 1; // atexit error
 
    term.c_cc[VERASE] = erase;
 
    if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &term) < 0)
        return 1; // tcsetattr error
 
    return 0;
}
 
void tty_recover(void){
    tcsetattr(STDIN_FILENO, TCSAFLUSH, &orig_term);
    return;
}