#include <stdio.h>#include <unistd.h>#include <termios.h>char *menu[] = {    "a - add new record",    "d - delete record",    "q - quit",    NULL,};int getchoice(char *greet, char *choices[], FILE *in, FILE *out);int main(){    int choice = 0;    FILE *input;    FILE *output;    struct termios initial_settings, new_settings;    if (!isatty(fileno(stdout))) {        fprintf(stderr,"You are not a terminal, OK.\n");    }    input = fopen("/dev/tty", "r");    output = fopen("/dev/tty", "w");    if(!input || !output) {        fprintf(stderr, "Unable to open /dev/tty\n");        exit(1);    }    tcgetattr(fileno(input),&initial_settings);    new_settings = initial_settings;    new_settings.c_lflag &= ~ICANON;    new_settings.c_lflag &= ~ECHO;    new_settings.c_cc[VMIN] = 1;    new_settings.c_cc[VTIME] = 0;    new_settings.c_lflag &= ~ISIG;    if(tcsetattr(fileno(input), TCSANOW, &new_settings) != 0) {        fprintf(stderr,"could not set attributes\n");    }    do {        choice = getchoice("Please select an action", menu, input, output);        printf("You have chosen: %c\n", choice);    } while (choice != 'q');    tcsetattr(fileno(input),TCSANOW,&initial_settings);    exit(0);}int getchoice(char *greet, char *choices[], FILE *in, FILE *out){    int chosen = 0;    int selected;    char **option;    do {        fprintf(out, "Choice: %s\n",greet);        option = choices;        while(*option) {            fprintf(out, "%s\n",*option);            option++;        }        do {            selected = fgetc(in);        } while (selected == '\n' || selected == '\r');        option = choices;        while(*option) {            if(selected == *option[0]) {                chosen = 1;                break;            }            option++;        }        if(!chosen) {            fprintf(out, "Incorrect choice, select again\n");        }    } while(!chosen);    return selected;}