/*
    mdport.c - Machine Dependent Code for Porting Unix/Curses games

    Copyright (C) 2005 Nicholas J. Kisseberth
    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.
    3. Neither the name(s) of the author(s) nor the names of other contributors
       may be used to endorse or promote products derived from this software
       without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) 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 AUTHOR(S) 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 <stdlib.h>
#include <string.h>

#if defined(_WIN32)
#include <Windows.h>
#include <io.h>
#include <sys/locking.h>
#include <Lmcons.h>
#include <conio.h>
#pragma warning( disable: 4201 ) 
#include <shlobj.h>
#pragma warning( default: 4201 ) 
#include <Shlwapi.h>
#undef MOUSE_MOVED
#endif

#include <curses.h>

#include "mdport.h"

#if defined(HAVE_SYS_TYPES)
#include <sys/types.h>
#endif

#if defined(HAVE_PROCESS_H)
#include <process.h>
#endif

#if defined(HAVE_PWD_H)
#include <pwd.h>
#endif

#if defined(HAVE_ARPA_INET_H)
#include <arpa/inet.h> /* Solaris 2.8 required this for htonl() and ntohl() */
#endif

#if defined(HAVE_TERMIOS_H)
#include <termios.h>
#endif

#if defined(HAVE_UNISTD_H)
#ifndef __USE_GNU
#define __USE_GNU
#include <unistd.h>
#undef __USE_GNU
#else
#include <unistd.h>
#endif
#endif

#if defined(HAVE_TERM_H)
#include <term.h>
#elif defined(HAVE_NCURSES_TERM_H)
#include <ncurses/term.h>
#endif

#if defined(HAVE_WORKING_FORK)
#include <sys/wait.h>
#endif

#ifdef HAVE_UTMPX_H
#include <utmpx.h>
#endif

#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif

#include <ctype.h>
#include <fcntl.h>
#include <limits.h>
#include <sys/stat.h>
#include <signal.h>
#include <time.h>

#define NOOP(x) (x += 0)

static int pass_ctrl_keypad = 1;

void
md_init(int options)
{
#if defined(__INTERIX)
    char *term;

    term = getenv("TERM");

    if (term == NULL)
        setenv("TERM","interix");
#elif defined(__DJGPP__)
    _fmode = _O_BINARY;
#elif defined(_WIN32)
    _fmode = _O_BINARY;
#endif

#if defined(HAVE_ESCDELAY) || defined(NCURSES_VERSION)
    ESCDELAY=64;
#endif

#if defined(DUMP)
    md_onsignal_default();
#else
    md_onsignal_exit();
#endif

    if (options & MD_STRIP_CTRL_KEYPAD)
        pass_ctrl_keypad = 0;
    else
        pass_ctrl_keypad = 1;
}

void
md_onsignal_default(void)
{
#ifdef SIGHUP
    signal(SIGHUP, SIG_DFL);
#endif
#ifdef SIGQUIT
    signal(SIGQUIT, SIG_DFL);
#endif
#ifdef SIGILL
    signal(SIGILL, SIG_DFL);
#endif
#ifdef SIGTRAP
    signal(SIGTRAP, SIG_DFL);
#endif
#ifdef SIGIOT
    signal(SIGIOT, SIG_DFL);
#endif
#ifdef SIGEMT
    signal(SIGEMT, SIG_DFL);
#endif
#ifdef SIGFPE
    signal(SIGFPE, SIG_DFL);
#endif
#ifdef SIGBUS
    signal(SIGBUS, SIG_DFL);
#endif
#ifdef SIGSEGV
    signal(SIGSEGV, SIG_DFL);
#endif
#ifdef SIGSYS
    signal(SIGSYS, SIG_DFL);
#endif
#ifdef SIGTERM
    signal(SIGTERM, SIG_DFL);
#endif
}

void
md_onsignal_exit(void)
{
#ifdef SIGHUP
    signal(SIGHUP, SIG_DFL);
#endif
#ifdef SIGQUIT
    signal(SIGQUIT, exit);
#endif
#ifdef SIGILL
    signal(SIGILL, exit);
#endif
#ifdef SIGTRAP
    signal(SIGTRAP, exit);
#endif
#ifdef SIGIOT
    signal(SIGIOT, exit);
#endif
#ifdef SIGEMT
    signal(SIGEMT, exit);
#endif
#ifdef SIGFPE
    signal(SIGFPE, exit);
#endif
#ifdef SIGBUS
    signal(SIGBUS, exit);
#endif
#ifdef SIGSEGV
    signal(SIGSEGV, exit);
#endif
#ifdef SIGSYS
    signal(SIGSYS, exit);
#endif
#ifdef SIGTERM
    signal(SIGTERM, exit);
#endif
}

extern void auto_save(int sig);
extern void endit(int sig);
extern void quit(int sig);

void
md_onsignal_autosave(void)
{

#ifdef SIGHUP
    signal(SIGHUP, auto_save);
#endif
#ifdef SIGQUIT
	signal(SIGQUIT, endit);
#endif
#ifdef SIGILL
    signal(SIGILL, auto_save);
#endif
#ifdef SIGTRAP
    signal(SIGTRAP, auto_save);
#endif
#ifdef SIGIOT
    signal(SIGIOT, auto_save);
#endif
#ifdef SIGEMT
    signal(SIGEMT, auto_save);
#endif
#ifdef SIGFPE
    signal(SIGFPE, auto_save);
#endif
#ifdef SIGBUS
    signal(SIGBUS, auto_save);
#endif
#ifdef SIGSEGV
    /* If there's a segfault, the game state is probably trashed
       and there's no point saving it. */
    signal(SIGSEGV, SIG_DFL);
#endif
#ifdef SIGSYS
    signal(SIGSYS, auto_save);
#endif
#ifdef SIGTERM
    signal(SIGTERM, auto_save);
#endif
#ifdef SIGINT
    signal(SIGINT, quit);
#endif
}

#ifdef _WIN32
static int md_standout_mode = 0;
#endif

void
md_raw_standout(void)
{
#ifdef _WIN32
    CONSOLE_SCREEN_BUFFER_INFO csbiInfo; 
    HANDLE hStdout;
    WORD fgattr,bgattr;

    if (md_standout_mode == 0)
    {
        hStdout = GetStdHandle(STD_OUTPUT_HANDLE); 
        GetConsoleScreenBufferInfo(hStdout, &csbiInfo);
        fgattr = (csbiInfo.wAttributes & 0xF);
        bgattr = (csbiInfo.wAttributes & 0xF0);
        SetConsoleTextAttribute(hStdout,(fgattr << 4) | (bgattr >> 4));
        md_standout_mode = 1;
    }
#elif defined(SO)
    tputs(SO,0,putchar);
    fflush(stdout);
#endif
}

void
md_raw_standend(void)
{
#ifdef _WIN32
    CONSOLE_SCREEN_BUFFER_INFO csbiInfo; 
    HANDLE hStdout;
    WORD fgattr,bgattr;

    if (md_standout_mode == 1)
    {
        hStdout = GetStdHandle(STD_OUTPUT_HANDLE); 
        GetConsoleScreenBufferInfo(hStdout, &csbiInfo);
        fgattr = (csbiInfo.wAttributes & 0xF);
        bgattr = (csbiInfo.wAttributes & 0xF0);
        SetConsoleTextAttribute(hStdout,(fgattr << 4) | (bgattr >> 4));
        md_standout_mode = 0;
    }
#elif defined(SE)
    tputs(SE,0,putchar);
    fflush(stdout);
#endif
}

int
md_unlink_open_file(const char *file, FILE *inf)
{
#ifdef _WIN32
    fclose(inf);
    (void) _chmod(file, 0600);
    return( _unlink(file) );
#else
    return(unlink(file));
#endif
}

int
md_unlink(char *file)
{
#ifdef _WIN32
    (void) _chmod(file, 0600);
    return( _unlink(file) );
#else
    return(unlink(file));
#endif
}

int
md_chmod(const char *filename, int mode)
{
#ifdef _WIN32
    return( _chmod(filename, mode) );
#else
    return( chmod(filename, mode) );
#endif
}

void
md_normaluser(void)
{
#if defined(HAVE_GETGID) && defined(HAVE_GETUID)
	gid_t realgid = getgid();
	uid_t realuid = getuid();

#if defined(HAVE_SETRESGID)
    if (setresgid(-1, realgid, realgid) != 0) {
#elif defined (HAVE_SETREGID) 
    if (setregid(realgid, realgid) != 0) {
#elif defined (HAVE_SETGID)
	if (setgid(realgid) != 0) {
#else
	if (0) {
#endif
		perror("Could not drop setgid privileges.  Aborting.");
		exit(1);
    }

#if defined(HAVE_SETRESUID)
    if (setresuid(-1, realuid, realuid) != 0) {
#elif defined(HAVE_SETREUID)
    if (setreuid(realuid, realuid) != 0) {
#elif defined(HAVE_SETUID)
	if (setuid(realuid) != 0) {
#else
	if (0) {
#endif
	perror("Could not drop setuid privileges.  Aborting.");
	exit(1);
    }
#endif
}

uid_t
md_getuid(void)
{
#ifdef HAVE_GETUID
    return( getuid() );
#else
    return(42);
#endif
}

char *
md_getusername(void)
{
    static char login[80];
    char *l = NULL;
#ifdef _WIN32
    LPSTR mybuffer;
    DWORD size = UNLEN + 1;
    TCHAR buffer[UNLEN + 1];

    mybuffer = buffer;
    GetUserName(mybuffer,&size);
    l = mybuffer;
#elif defined(HAVE_GETPWUID)&& !defined(__DJGPP__)
    struct passwd *pw;

    pw = getpwuid(getuid());
    /* Don't segfault if getpwuid fails (and the thing is wildly possible) */
    if (pw != NULL)
	l = pw->pw_name;
    else
	l = NULL;
#endif

    if ((l == NULL) || (*l == '\0'))
        if ( (l = getenv("USERNAME")) == NULL )
            if ( (l = getenv("LOGNAME")) == NULL )
                if ( (l = getenv("USER")) == NULL )
                    l = "nobody";

    strncpy(login,l,80);
    login[79] = 0;

    return(login);
}

char *
md_gethomedir(void)
{
    static char homedir[PATH_MAX];
    char *h = NULL;
    size_t len;
#if defined(_WIN32)
    TCHAR szPath[PATH_MAX];
#endif
#if defined(_WIN32) || defined(DJGPP)
        char slash = '\\';
#else
    char slash = '/';
    struct passwd *pw;