A reminder for terminal control

/* For memorialby double*/#include <stdio.h>#include <unistd.h>#include <termios.h>int get_choice(char * str, char ** menu, FILE * in, FILE * out);void check_redirect(void);int set_new_terminal_attr(struct termios * init_attr, struct termios * new_attr, int fd);int restore_terminal_attr(struct termios * init_attr, int fd);int main(void) {char * menu[] = {"a. Add","c. Change","d. Delete",NULL};int choice;FILE * in_file, * out_file;struct termios init_termios, new_termios;check_redirect();in_file = fopen("/dev/tty", "r");out_file = fopen("/dev/tty", "w");if (!in_file || !out_file) {fprintf(stderr, "Unable to open /dev/tty/n");return 1;}set_new_terminal_attr(&init_termios, &new_termios, fileno(in_file));do {choice = get_choice("Please Make Your Choice:", menu, in_file, out_file);fprintf(out_file, "/nYou have chosen: %c/n/n", choice);}while(choice != 'q');restore_terminal_attr(&init_termios, fileno(in_file));fclose(in_file);fclose(out_file);return 0;}int get_choice(char * str, char ** menu, FILE * in, FILE * out) {int choice;for (; *menu; ++menu) {fprintf(out, "%s/n", *menu);}fprintf(out, "%s", str);fflush(out);do {choice = fgetc(in);}while(choice == '/n' || choice == '/r');return choice;}void check_redirect(void) {if (!isatty(fileno(stdout)))fprintf(stderr, "----------You are not a terminal----------/n");return ;}int set_new_terminal_attr(struct termios * init_attr, struct termios * new_attr, int fd) {if(tcgetattr(fd, init_attr)) {fprintf(stderr, "tcgetattr error/n");return 1;}* new_attr = * init_attr;new_attr->c_lflag &= ~ICANON;new_attr->c_lflag &= ~ECHO;/* signal must be ignored, in case user press ^C when program running, which will lost the initial setting*/new_attr->c_lflag &= ~ISIG; /* This is important */new_attr->c_cc[VMIN] = 1;new_attr->c_cc[VTIME] = 0;tcsetattr(fd, TCSAFLUSH, new_attr);return 0;}int restore_terminal_attr(struct termios * init_attr, int fd) {if (!tcsetattr(fd, TCSANOW, init_attr)) {return 0;}return 1;}