src/input.c

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2016 Mike Becker. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include "input.h"
#include <ctype.h>
#include <stdbool.h> /* necessary to avoid errors with outdated curses.h */
#include <curses.h>

int prompt_yesno(char *msg) {
    printw("%s (y/n)? ", msg);
    clrtoeol();
    refresh();
    noecho();
    int ch;
    do {
        ch = getch();
    } while (ch != 'y' && ch != 'n');
    echo();
    
    return ch == 'y';
}

int asyncgetnstr(char *str, size_t *pos, size_t len) {
    WINDOW* w = stdscr;
    int y, x;
    getyx(w, y, x);
    mvwaddnstr(w, y, x, str, *pos);
    wrefresh(w);
    int c = wgetch(w);

    if (c != ERR) {
        switch (c) {
        case KEY_DOWN:
        case '\n':
            str[*pos] = '\0';
            *pos = 0;
            waddch(w,'\n');
            return 1;
        case 127: /* ASCII DEL (important for macOS) */
        case KEY_DC: /* DEL key (for other OS) */
        case KEY_BACKSPACE:
        case KEY_LEFT:
            if ((*pos) > 0) {
                str[--(*pos)] = '\0';
            }
            break;
        default:
            if (isprint(c) && *pos < len-1) {
                str[(*pos)++] = (char) c;
            }
        }
    }
    
    return 0;
}