#include <unistd.h>
#include <stdio.h>

char *menu[] = {
    "a - add new record",
    "d - delete record",
    "q - quit",
    NULL,
};

int getchoice(char *greet, char *choices[]);

int main()
{
    int choice = 0;

    if(!isatty(fileno(stdout))) {
        fprintf(stderr,"You are not a terminal!\n");
        exit(1);
    }

    do
    {
        choice = getchoice("Please select an action", menu);
        printf("You have chosen: %c\n", choice);
    } while (choice != 'q');
    exit(0);
}

int getchoice(char *greet, char *choices[])
{
    int chosen = 0;
    int selected;
    char **option;

    do {
        printf("Choice: %s\n",greet);
        option = choices;
        while(*option) {
            printf("%s\n",*option);
            option++;
        }
        selected = getchar();
        option = choices;
        while(*option) {
            if(selected == *option[0]) {
                chosen = 1;
                break;
            }
            option++;
        }
        if(!chosen) {
            printf("Incorrect choice, select again\n");
        }
    } while(!chosen);
    return selected;
}