SpaceConstruct/MagiDoor/MD_Getc.c

#include <errno.h>
#include <stdio.h>
#if defined(_MSC_VER) || defined(WIN32)
#include <winsock2.h>
#else
#include <sys/socket.h>
#endif
#include <unistd.h>
#include <time.h>
#include <string.h>
#include "MagiDoor.h"

extern time_t mdtimeout;
extern time_t mdtimeremaining;

char md_getc() {
    char c;
    ssize_t ret;
    while (1) {
        if (mdcontrol.socket == -1) {
            ret = read(STDIN_FILENO, &c, 1);
        } else {
            ret = recv(mdcontrol.socket, &c, 1, 0);
        }
        if (ret == 0) {
            md_exit(0);
        }
#if defined(_MSC_VER) || defined(WIN32)
        if (ret == SOCKET_ERROR && WSAGetLastError() == WSAEWOULDBLOCK) {
#else
        if (ret == -1 && (errno == EAGAIN || errno == EWOULDBLOCK)) {
#endif
            if (mdtimeout <= time(NULL)) {
                md_printf("\r\nIdle timeout!\r\n");
                md_exit(0);
            }
            if (mdtimeremaining <= time(NULL)) {
                md_printf("\r\nOut of time!\r\n");
                md_exit(0);
            }
            usleep(100);
            continue;
        }
        mdtimeout = time(NULL) + 900;
        return c;
    }
}

char md_get_answer(char *options) {
    char c;
    c = md_getc();
    while (strchr(options, c) == NULL) {
        c = md_getc();
    }
    return c;
}

int md_getstring(char *ptr, int maxlen, char minchar, char maxchar) {
    char c;
    int len = 0;
    static char lastc = 'x';

    *ptr = '\0';
    
    while (len < maxlen) {
        c = md_getc();
        if (c == '\n' || c == '\0') {
            lastc = c;
            if (lastc == '\r') {
                continue;
            } else {
                return len;
            }
        }
        if (c == '\r') {
            lastc = c;
            return len;
        } 
        if (c == '\b' || c == 127) {
            if (len > 0) {
                md_printf("\b \b");
                len--;
                ptr[len] = '\0';
            }
            lastc = c;
            continue;
        }
        if (c >= minchar && c <= maxchar) {
            ptr[len++] = c;
            ptr[len] = '\0';
            md_putchar(c);
        }
        lastc = c;
    }

    return len;
}