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/*
 *  R : A Computer Language for Statistical Data Analysis
 *  Copyright (C) 1995, 1996  Robert Gentleman and Ross Ihaka
 *  Copyright (C) 1997-1999  Robert Gentleman, Ross Ihaka and the
 *                            R Development Core Team
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/*
 *  SYSTEM DEPENDENT CODE (Windows version: G.M. and B.D.R.)
 *
 *  This source file contains the platform dependent code for
 *  the Unix (reference) port of R.
 *
 *
 *  1) FATAL MESSAGES AT STARTUP
 *
 *    void  R_Suicide(char *msg)
 *
 *  This function displays the given message and the causes R to
 *  die immediately.  It is used for non-recoverable errors such as
 *  not having enough memory to launch etc.  The phrase "dialog box"
 *  springs to mind for non-Unix platforms.
 *
 *
 *  2. CONSOLE I/O
 *
 *  The first group of functions is concerned with reading and
 *  writing to the system console.
 *
 *    int   R_ReadConsole(char *prompt, char *buf, int buflen, int hist)
 *
 *  This function prints the given prompt at the console and then
 *  does a gets(3)-like operation, transferring up to "buflen" characters
 *  into the buffer "buf".  The last two characters are set to "\n\0"
 *  to preserve sanity.  If "hist" is non-zero, then the line is added
 *  to any command history which is being maintained.  Note that this
 *  is one natural place from which to run an event loop.
 *
 *    void  R_WriteConsole(char *buf, int buflen)
 *
 *  This function writes the given buffer out to the console.  No
 *  special actions are required.  Under Unix the characters are
 *  just appended to stdout.
 *
 *    void  R_ResetConsole(void)
 *
 *  This function is called when the system is reset after an error.
 *  It probably isn't really needed.
 *
 *    void  R_FlushConsole(void)
 *
 *  This called to flush any output to the system console.  Under Unix
 *  this is just fflush(stdout).  Other systems may not need this.
 *
 *    void  R_ClearerrConsole(void)
 *
 *  This function clears any errors associated with reading from the
 *  console.  In Unix is is used to clear any EOF condition associated
 *  with stdin.
 *
 *
 *  3) ACTIONS DURING (LONG) COMPUTATIONS
 *
 *    void  R_Busy(int which)
 *
 *  This function invokes actions (such as change of cursor) when
 *  R embarks on an extended computation (which=1) and when such a
 *  state terminates (which=0).
 *
 *
 *  4) INITIALIZATION AND TERMINATION ACTIONS
 *
 *    void  R_InitialData(void)
 *    FILE* R_OpenInitFile(void)
 *    FILE* R_OpenLibraryFile(char *file)
 *    FILE* R_OpenSysInitFile(void)
 *    FILE* R_OpenSiteFile()
 *
 *  These functions load the initial system and user data into R.
 *
 *    void  R_RestoreGlobalEnv(void)
 *    void  R_SaveGlobalEnv(void)
 *
 *  These functions save and restore the user's global environment.
 *  The system specific aspect of this is what files are used.
 *
 *    void  R_CleanUp(int saveact)

 *  This function invokes any actions which occur at system termination.
 *
 *
 *  5) FILESYSTEM INTERACTION
 *
 *    int FileExists(char *file)
 *
 *  This function returns 1 if the named file exists and 0 otherwise.
 *  On Unix this is just an interface to "stat".
 *
 *    int R_HiddenFile(char *file)
 *
 *  This function returns 1 if the named file is "hidden".  In Unix,
 *  this is the case if the file name begins with a '.'.  On the Mac
 *  a file is hidden if the file name ends in '\r'.
 *
 *    int R_ShowFiles(int nfile, char **file, char **headers, char *wtitle,
 *            int del, char *pager)
 *
 *  This function is used to display the contents of files.  On (raw)
 *  Unix this means invoking a pager on the file.  On Gui-based platforms
 *  the file would probably be displayed in a window with the given
 *  title.
 *
 *    char* R_ExpandFileName(char *s)
 *
 *  This is a utility function which can be used to expand special
 *  characters in file names.  In Unix it's sole function is to expand
 *  and "~"s which occur in filenames (and then only when the readline
 *  library is available.  The minimal action is to return the argument
 *  unaltered.
 *
 *    FILE *R_fopen(const char *filename, const char *mode);
 *
 *  This is a (probably unnecessary) wrapper function for ``fopen''.
 *
 *
 *  6) SYSTEM INFORMATION
 *
 *    char *R_HomeDir(void)
 *
 *  Get the R ``home directory'' as a string.
 *
 *
 *  7) PLATFORM DEPENDENT FUNCTIONS
 *
 *    SEXP do_getenv(SEXP call, SEXP op, SEXP args, SEXP rho)
 *    SEXP do_interactive(SEXP call, SEXP op, SEXP args, SEXP rho)
 *    SEXP do_machine(SEXP call, SEXP op, SEXP args, SEXP rho)
 *    SEXP do_proctime(SEXP call, SEXP op, SEXP args, SEXP rho)
 *    SEXP do_system(SEXP call, SEXP op, SEXP args, SEXP rho)
 *
 */

#include "Defn.h"
#include "Fileio.h"
#include "Arith.h"      /* R_NaInt */
#include "Graphics.h"       /* KillAllDevices() [nothing else?] */
#include "graphapp/ga.h"
#include "console.h"
#include "rui.h"
#include "getline/getline.h"
#include "devga.h"
#include <windows.h>
#include "run.h"
#include "Startup.h"

static int SaveAction = SA_DEFAULT;
static int RestoreAction = SA_NORESTORE;
static int LoadSiteFile = True;
static int LoadInitFile = True;
static int DebugInitFile = False;
static int NoRenviron = False;

UImode  CharacterMode;
int   ConsoleAcceptCmd;

/* used to avoid some flashing during cleaning up */
int   AllDevicesKilled = 0;
int   setupui(void);
void  delui(void);

int   UserBreak = 0;
/* callbacks */
static void (*R_CallBackHook) ();
static void R_DoNothing() {}
static void (*my_R_Busy)(int);

void ProcessEvents(void)
{
    while (peekevent()) doevent();
    if (UserBreak) {
    UserBreak = 0;
    /* error("user break\n"); */
    raise(SIGINT);
    }
    R_CallBackHook();
}

static void char_message(char *s)
{
    if (!s) return;
    R_WriteConsole(s, strlen(s));
}

static int char_yesnocancel(char *s)
{
    char  a[3], ss[128];

    sprintf(ss, "%s [y/n/c]: ", s);
    R_ReadConsole(ss, a, 3, 0);
    switch (a[0]) {
    case 'y':
    case 'Y':
    return YES;
    case 'n':
    case 'N':
    return NO;
    default:
    return CANCEL;
    }
}


/*
 * I realized that we are supporting 4 different type of input.
 * 1) from the gui console;
 * 2) from a character mode console (interactive);
 * 3) from a pipe under -ess, i.e, interactive.
 * 4) from a file or from a pipe (not interactive)
 *
 * Hence, it is better to have a different function for every
 * situation.
 * Same, it is true for output (but in this case, 3==4)
 *
 * BTW, 3 and 4 are different on input  since fgets,ReadFile...
 * "blocks" =>
 * (e.g.) you cannot give focus to the graphics device if
 * you are wating for input. For this reason, under 3,
 * fgets is runned in a different thread (Windows is wonderful,
 * I never used 'threads', hence, after made this running
 * I was very, very happy "Wuah, fgets in a thread!!!")
 */


/*1:*/
static int R_is_running = 0;

void Rconsolesetwidth(int cols)
{
    if(R_is_running && setWidthOnResize)
    R_SetOptionWidth(cols);
}

static int GuiReadConsole(char *prompt, char *buf, int len, int addtohistory)
{
    char *p;
    char *NormalPrompt =
    (char *) CHAR(STRING(GetOption(install("prompt"), R_NilValue))[0]);

    if(!R_is_running) {
    R_is_running = 1;
    Rconsolesetwidth(consolecols(RConsole));
    }
    ConsoleAcceptCmd = !strcmp(prompt, NormalPrompt);
    consolereads(RConsole, prompt, buf, len, addtohistory);
    for (p = buf; *p; p++)
    if (*p == EOF)
        *p = '\001';
    ConsoleAcceptCmd = 0;
    return 1;
}

static void GuiWriteConsole(char *buf,int len)
{
    char *p;

    for (p = buf; *p; p++)
    if (*p == '\001')
        *p = EOF;
    consolewrites(RConsole, buf);
}

/*2:*/
static char LastLine[512];

int CharReadConsole(char *prompt, char *buf, int len, int addtohistory)
{
    static char *gl = NULL;
    int   i;

    if (!gl) {
    strcat(LastLine, prompt);
    gl = getline(LastLine);
    LastLine[0] = '\0';
    if (addtohistory)
        gl_histadd(gl);
    }
    for (i = 0; *gl && (*gl != '\n') && (i < len - 2); gl++, i++)
    buf[i] = *gl;
    buf[i] = '\n';
    buf[i + 1] = '\0';
    if (!*gl || (*gl == '\n'))
    gl = NULL;
    return 1;
}

void CharWriteConsole(char *buf, int len)
{
    char *p = strrchr(buf, '\n');

    if (p)
    strcpy(LastLine, p + 1);
    else
    strcat(LastLine, buf);
    printf("%s", buf);
}

/*3:*/

/*
 * Variables used to communicate between thread and main process
 */
static int lineavailable, lengthofbuffer;
static char *inputbuffer;

static DWORD CALLBACK
threadedfgets(LPVOID unused)
{
    inputbuffer = fgets(inputbuffer, lengthofbuffer, stdin);
    lineavailable = 1;
    return 0;
}

static int
PipeReadConsole(char *prompt, char *buf, int len, int addhistory)
{
    HANDLE rH;
    int   id;

    if (!R_Slave) {
    fputs(prompt, stdout);
    fflush(stdout);
    }
    lineavailable = 0;
    lengthofbuffer = len;
    inputbuffer = buf;
    rH = CreateThread(NULL, 0, threadedfgets, NULL, 0, &id);
    if (!rH) {
    /* failure! Use standard fgets. */
    inputbuffer = fgets(buf, len, stdin);
    lineavailable = 1;
    }
    while (!lineavailable)
    doevent();
    if (rH)
    CloseHandle(rH);
    if (!inputbuffer)
    return 0;
    else
    return 1;
}

/*4:*/
static int
FileReadConsole(char *prompt, char *buf, int len, int addhistory)
{
    if (!R_Slave) {
    fputs(prompt, stdout);
    fflush(stdout);
    }
    if (!fgets(buf, len, stdin))
    return 0;
    if (!R_Slave)
    fputs(buf, stdout);
    return 1;
}

static void
FileWriteConsole(char *buf, int len)
{
    printf("%s", buf);
}


static int (*TrueReadConsole) (char *, char *, int, int);
static void (*TrueWriteConsole) (char *, int);

 /* Fill a text buffer with user typed console input. */
int
R_ReadConsole(char *prompt, unsigned char *buf, int len, int addtohistory)
{
    ProcessEvents();
    return TrueReadConsole(prompt, buf, len, addtohistory);
}

    /* Write a text buffer to the console. */
    /* All system output is filtered through this routine. */

void R_WriteConsole(char *buf, int len)
{
    ProcessEvents();
    TrueWriteConsole(buf, len);
}


    /* Indicate that input is coming from the console */

void R_ResetConsole()
{
}


    /* Stdio support to ensure the console file buffer is flushed */

void R_FlushConsole()
{
    if (CharacterMode == RTerm) fflush(stdin);
    else if (CharacterMode == RGui) consoleflush(RConsole);
}


    /* Reset stdin if the user types EOF on the console. */

void R_ClearerrConsole()
{
    if (CharacterMode == RTerm)  clearerr(stdin);
}


    /*--- File Handling Code ---*/

static int HaveHOME=-1;
static char UserHOME[PATH_MAX];
static char newFileName[PATH_MAX];
char *R_ExpandFileName(char *s)
{
    char *p;

    if(s[0] != '~') return s;
    if(HaveHOME < 0) {
    HaveHOME = 0;
    p = getenv("HOME");
    if(p && strlen(p)) {
        strcpy(UserHOME, p);
        HaveHOME = 1;
    } else {
        p = getenv("HOMEDIR");
        if(p) {
        strcpy(UserHOME, p);
        p = getenv("HOMEPATH");
        if(p) {
            strcat(UserHOME, p);
            HaveHOME = 1;
        }
        }
    }
    }
    if(HaveHOME > 0) {
    strcpy(newFileName, UserHOME);
    strcat(newFileName, s+1);
    return newFileName;
    } else return s;
}


FILE *R_OpenLibraryFile(char *file)
{
    char buf[256];
    FILE *fp;

    sprintf(buf, "%s/library/base/R/%s", R_Home, file);
    fp = R_fopen(buf, "r");
    return fp;
}

FILE *R_OpenSysInitFile(void)
{
    char buf[256];
    FILE *fp;

    sprintf(buf, "%s/library/base/R/Rprofile", R_Home);
    fp = R_fopen(buf, "r");
    return fp;
}

FILE *R_OpenSiteFile(void)
{
    char buf[256];
    FILE *fp;

    fp = NULL;

    if (LoadSiteFile) {
    if ((fp = R_fopen(getenv("R_PROFILE"), "r")))
        return fp;
    if ((fp = R_fopen(getenv("RPROFILE"), "r")))
        return fp;
    sprintf(buf, "%s/etc/Rprofile", R_Home);
    if ((fp = R_fopen(buf, "r")))
        return fp;
    }

    return fp;
}

FILE *R_OpenInitFile(void)
{
    char  buf[256];
    FILE *fp;

    fp = NULL;

    if (LoadInitFile) {
    if ((fp = R_fopen(".Rprofile", "r")))
        return fp;
    sprintf(buf, "%s/.Rprofile", getenv("R_USER"));
    if ((fp = R_fopen(buf, "r")))
        return fp;
    }

    return fp;
}


    /*--- Initialization Code ---*/

#ifdef HAVE_TIMES
static long StartTime;
#endif

static char RHome[MAX_PATH + 7];
static char UserRHome[MAX_PATH + 7];
static char RUser[MAX_PATH];
char *getRHOME();
void closeAllHlpFiles();
void UnLoad_Unzip_Dll();


/* Process ~/.Renviron, if it exists */
#include "opt.h"

/* like putenv, but allocate storage */
static void Putenv(char *str)
{
    char *buf;
    buf = (char *) malloc((strlen(str) + 1) * sizeof(char));
    strcpy(buf, str);
    putenv(buf);
}

static void processRenviron()
{
    char *opt[2], optf[MAX_PATH], buf[80];
    int   ok;

    sprintf(optf, "%s/.Renviron", getenv("R_USER"));
    if (!optopenfile(optf))
    return;
    while ((ok = optread(opt, '='))) {
    sprintf(buf, "%s=%s", opt[0], opt[1]);
    Putenv(buf);
    }
    optclosefile();
}


void GuiBusy(int which)
{
    if (which == 1) gsetcursor(RConsole, WatchCursor);
    if (which == 0) gsetcursor(RConsole, ArrowCursor);
}

void CharBusy(int which)
{
}

void R_Busy(int which)
{
    my_R_Busy(which);
}

void R_SetParams(Rstart Rp)
{
    R_Home = Rp->rhome;
    sprintf(RHome, "R_HOME=%s", R_Home);
    putenv(RHome);
    strcpy(UserRHome, "R_USER=");
    strcat(UserRHome, Rp->home);
    putenv(UserRHome);

    CharacterMode = Rp->CharacterMode;
    TrueReadConsole = Rp->ReadConsole;
    TrueWriteConsole = Rp->WriteConsole;
    R_CallBackHook = Rp->CallBack;
    R_ShowMessage = Rp->message;
    R_yesnocancel = Rp->yesnocancel;
    my_R_Busy = Rp->busy;
    R_Quiet = Rp->R_Quiet;
    R_Slave = Rp->R_Slave;
    R_Interactive = Rp->R_Interactive;
    R_Verbose = Rp->R_Verbose;
    RestoreAction = Rp->RestoreAction;
    SaveAction = Rp->SaveAction;
    LoadSiteFile = Rp->LoadSiteFile;
    LoadInitFile = Rp->LoadInitFile;
    DebugInitFile = Rp->DebugInitFile;
    NoRenviron = Rp->NoRenviron;
    R_VSize = Rp->vsize;
    R_NSize = Rp->nsize;

/* Process ~/.Renviron, if it exists. This may already have been done
 * in case R_VSIZE and R_NSIZE are set there.
 */
    if(!Rp->NoRenviron) processRenviron();
#ifdef Win32
    /* in case caller uses getline */
    gl_events_hook = ProcessEvents;
    _controlfp(_MCW_EM, _MCW_EM);
#endif
}

#define Max_Nsize 20000000  /* must be < LONG_MAX (= 2^32 - 1 =)
                   2147483647 = 2.1e9 */
#define Max_Vsize (2048*Mega)   /* must be < LONG_MAX */

#define Min_Nsize 200000
#define Min_Vsize (2*Mega)


int cmdlineoptions(int ac, char **av)
{
    int   value, ierr, nset = 0, vset = 0;
    char *p;
    char  s[1024];
    structRstart rstart;
    Rstart Rp = &rstart;

    Rp->R_Quiet = False;
    Rp->R_Slave = False;
    Rp->R_Verbose = False;
    Rp->SaveAction = SA_SAVEASK;
    Rp->RestoreAction = SA_RESTORE;
    Rp->LoadSiteFile = True;
    Rp->LoadInitFile = True;
    Rp->DebugInitFile = False;
    Rp->NoRenviron = False;
    Rp->vsize = R_VSIZE;
    Rp->nsize = R_NSIZE;

/* Here so that -ess and similar can change */
    Rp->CallBack = R_DoNothing;
    if (CharacterMode == RTerm) {
    if (isatty(0)) {
        Rp->R_Interactive = True;
        LastLine[0] = 0;
        Rp->ReadConsole = CharReadConsole;
        Rp->WriteConsole = CharWriteConsole;
    } else {
        Rp->R_Interactive = False;
        R_Consolefile = stdout; /* used for errors */
        R_Outputfile = stdout;  /* used for sink-able output */
        Rp->ReadConsole = FileReadConsole;
        Rp->WriteConsole = FileWriteConsole;
    }
    Rp->message = char_message;
    Rp->yesnocancel = char_yesnocancel;
    Rp->busy = CharBusy;
    } else {
    Rp->R_Interactive = True;
    Rp->ReadConsole = GuiReadConsole;
    Rp->WriteConsole = GuiWriteConsole;
    Rp->message = askok;
    Rp->yesnocancel = askyesnocancel;
    Rp->busy = GuiBusy;
    }

    R_ShowMessage = Rp->message; /* used here */

#ifdef HAVE_TIMES
    StartTime = currenttime();
#endif


    while (--ac) {
    if (**++av == '-') {
        if (!strcmp(*av, "--version")) {
        PrintVersion(s);
        Rprintf(s);
        R_ShowMessage(s);
        exit(0);
        } else if (!strcmp(*av, "--save")) {
        Rp->SaveAction = SA_SAVE;
        } else if (!strcmp(*av, "--no-save")) {
        Rp->SaveAction = SA_NOSAVE;
        } else if (!strcmp(*av, "--restore")) {
        Rp->RestoreAction = SA_RESTORE;
        } else if (!strcmp(*av, "--no-restore")) {
        Rp->RestoreAction = SA_NORESTORE;
        } else if (!strcmp(*av, "--silent") ||
               !strcmp(*av, "--quiet") ||
               !strcmp(*av, "-q")) {
        R_Quiet = True;
        } else if (!strcmp(*av, "--vanilla")) {
        Rp->SaveAction = SA_NOSAVE; /* --no-save */
        Rp->RestoreAction = SA_NORESTORE;   /* --no-restore */
        Rp->LoadSiteFile = False;   /* --no-site-file */
        Rp->LoadInitFile = False;   /* --no-init-file */
        Rp->NoRenviron = True;
        } else if (!strcmp(*av, "--verbose")) {
        R_Verbose = True;
        } else if (!strcmp(*av, "--slave") ||
               !strcmp(*av, "-s")) {
        Rp->R_Quiet = True;
        Rp->R_Slave = True;
        Rp->SaveAction = SA_NOSAVE;
        } else if (!strcmp(*av, "--no-site-file")) {
        Rp->LoadSiteFile = False;
        } else if (!strcmp(*av, "--no-init-file")) {
        Rp->LoadInitFile = False;
        } else if (!strcmp(*av, "--debug-init")) {
        Rp->DebugInitFile = True;
        } else if (!strcmp(*av, "--no-environ")) {
        Rp->NoRenviron = True;
        } else if (!strcmp(*av, "-save") ||
               !strcmp(*av, "-nosave") ||
               !strcmp(*av, "-restore") ||
               !strcmp(*av, "-norestore") ||
               !strcmp(*av, "-noreadline") ||
               !strcmp(*av, "-quiet") ||
               !strcmp(*av, "-V")) {
        sprintf(s, "WARNING: option %s no longer supported", *av);
        R_ShowMessage(s);
        } else if ((value = (*av)[1] == 'v') || !strcmp(*av, "--vsize")) {
        if (value)
            R_ShowMessage("WARNING: option `-v' is deprecated. Use `--vsize' instead.\n");
        if (!value || (*av)[2] == '\0') {
            ac--;
            av++;
            p = *av;
        } else
            p = &(*av)[2];
        if (p == NULL) {
            R_ShowMessage("WARNING: no vsize given");
            break;
        }
        value = Decode2Long(p, &ierr);
        if (ierr) {
            if (ierr < 0)
            goto badargs;   /* if(*p) goto badargs; */
            sprintf(s, "--vsize %d'%c': too large", value,
                (ierr == 1) ? 'M' : ((ierr == 2) ? 'K' : 'k'));
            R_ShowMessage(s);
        }
        if (value < 1000) {
            R_ShowMessage("WARNING: vsize ridiculously low, Megabytes assumed\n");
            value *= Mega;
        }
        if (value < Min_Vsize || value > Max_Vsize) {
            sprintf(s, "WARNING: invalid v(ector heap)size '%d' ignored;"
                "using default = %gM\n", value, R_VSize / Mega);
            R_ShowMessage(s);
        } else {
            vset = 1;
            Rp->vsize = value;
        }
        } else if ((value = (*av)[1] == 'n') || !strcmp(*av, "--nsize")) {
        if (value)
            R_ShowMessage("WARNING: option `-n' is deprecated.  "
                   "Use `--nsize' instead.\n");
        if (!value || (*av)[2] == '\0') {
            ac--;
            av++;
            p = *av;
        } else
            p = &(*av)[2];
        if (p == NULL) {
            R_ShowMessage("WARNING: no nsize given");
            break;
        }
        value = Decode2Long(p, &ierr);
        if (ierr) {
            if (ierr < 0)
            goto badargs;
            sprintf(s, "--nsize %d'%c': too large", value,
                (ierr == 1) ? 'M' : ((ierr == 2) ? 'K' : 'k'));
            R_ShowMessage(s);
        }
        if (value < Min_Nsize || value > Max_Nsize) {
            sprintf(s, "WARNING: invalid language heap (n)size '%d' ignored,"
                " using default = %d\n", value, R_NSize);
            R_ShowMessage(s);
        } else {
            nset = 1;
            Rp->nsize = value;
        }
        } else if (!strcmp(*av, "--ess")) {
/* Assert that we are interactive even if input is from a file */
        Rp->R_Interactive = 1;
        Rp->ReadConsole = PipeReadConsole;
        } else if (!strcmp(*av, "--mdi")) {
        MDIset = 1;
        } else if (!strcmp(*av, "--sdi") || !strcmp(*av, "--no-mdi")) {
        MDIset = -1;
        } else {
        sprintf(s, "WARNING: unknown option %s\n", *av);
        R_ShowMessage(s);
        break;
        }
    } else {
/* Allow NAME=value pairs and set as environment variables */
        p = strchr(*av, '=');
        if (p) {
        putenv(*av);
        } else {
        sprintf(s, "ARGUMENT '%s' __ignored__\n", *av);
        R_ShowMessage(s);
        }
    }
    }
    Rp->rhome = getRHOME();

/*
 * try R_USER then HOME then working directory
 * put these here to allow R_USER or HOME to be set on the command line.
 */
    if (getenv("R_USER")) {
    strcpy(RUser, getenv("HOME"));
    p = RUser + (strlen(RUser) - 1);
    if (*p == '/' || *p == '\\') *p = '\0';
    } else {
    if (getenv("HOME")) {
        strcpy(RUser, getenv("HOME"));
        p = RUser + (strlen(RUser) - 1);
        if (*p == '/' || *p == '\\') *p = '\0';
    } else
        GetCurrentDirectory(MAX_PATH, RUser);
    }
    Rp->home = RUser;

/* Process ~/.Renviron, if it exists, for R_NSIZE and R_VSIZE */
    if(!Rp->NoRenviron) {
    processRenviron();
    Rp->NoRenviron = True;
    }

    if (!vset && (p = getenv("R_VSIZE"))) {
    value = Decode2Long(p, &ierr);
    if (ierr != 0 || value > Max_Vsize || value < Min_Vsize)
        REprintf("WARNING: invalid R_VSIZE ignored;");
    else
        Rp->vsize = value;
    }
    if (!nset && (p = getenv("R_NSIZE"))) {
    value = Decode2Long(p, &ierr);
    if (ierr != 0 || value > Max_Nsize || value < Min_Nsize)
        REprintf("WARNING: invalid R_NSIZE ignored;");
    else
        Rp->nsize = value;
    }
/*
 *  Since users' expectations for save/no-save will differ, we decided
 *  that they should be forced to specify in the non-interactive case.
 */
    if (!R_Interactive && SaveAction != SA_SAVE && SaveAction != SA_NOSAVE)
    R_Suicide("you must specify `--save', `--no-save' or `--vanilla'");

    R_SetParams(Rp);

    return 0;

badargs:
    REprintf("invalid argument passed to R\n");
    exit(1);
}


void R_InitialData(void)
{
    R_RestoreGlobalEnv();
}

/*
   R_CleanUp is invoked at the end of the session to give the user the
   option of saving their data.
   If ask == SA_SAVEASK the user should be asked if possible (and this
   option should not occur in non-interactive use).
   If ask = SA_SAVE or SA_NOSAVE the decision is known.
   If ask = SA_DEFAULT use the SaveAction set at startup.
   In all these cases run .Last() unless quitting is cancelled.
   If ask = SA_SUICIDE, no save, no .Last, possibly other things.
 */

void R_dot_Last(void);      /* in main.c */

void R_CleanUp(int saveact)
{
    if(saveact == SA_DEFAULT) /* The normal case apart from R_Suicide */
    saveact = SaveAction;

    if(saveact == SA_SAVEASK) {
    if(R_Interactive) {
        switch (R_yesnocancel("Save workspace image?")) {
        case YES:
        saveact = SA_SAVE;
        break;
        case NO:
        saveact = SA_NOSAVE;
        break;
        case CANCEL:
        jump_to_toplevel();
        break;
        }
    } else saveact = SaveAction;
    }

    switch (saveact) {
    case SA_SAVE:
    R_dot_Last();
    if(R_DirtyImage) R_SaveGlobalEnv();
    break;
    case SA_NOSAVE:
    R_dot_Last();
    break;
    case SA_SUICIDE:
    default:
    }
    CleanEd();
    closeAllHlpFiles();
    KillAllDevices();
    AllDevicesKilled = 1;
    if (CharacterMode == RGui)
    savehistory(RConsole, ".Rhistory");
    UnLoad_Unzip_Dll();
    exitapp();
}

    /* Saving and Restoring the Global Environment */

void R_SaveGlobalEnv(void)
{
    FILE *fp = R_fopen(".RData", "wb"); /* binary file */
    if (!fp)
    error("can't save data -- unable to open ./.RData\n");
    R_SaveToFile(FRAME(R_GlobalEnv), fp, 0);
    fclose(fp);
}

void R_RestoreGlobalEnv(void)
{
    FILE *fp;
    if(RestoreAction == SA_RESTORE) {
    if(!(fp = R_fopen(".RData", "rb"))) { /* binary file */
        /* warning here perhaps */
        return;
    }
    FRAME(R_GlobalEnv) = R_LoadFromFile(fp);
    if (!R_Quiet)
        Rprintf("[Previously saved workspace restored]\n\n");
    fclose(fp);
    }
}


    /*--- Platform Dependent Functions ---*/


#ifdef HAVE_TIMES

SEXP do_proctime(SEXP call, SEXP op, SEXP args, SEXP env)
{
    SEXP  ans;
    long  elapsed;

    elapsed = (currenttime() - StartTime) / 10;
    ans = allocVector(REALSXP, 5);
    REAL(ans)[0] = R_NaReal;
    REAL(ans)[1] = R_NaReal;
    REAL(ans)[2] = (double) elapsed / 100.0;
    REAL(ans)[3] = R_NaReal;
    REAL(ans)[4] = R_NaReal;
    return ans;
}
#endif

SEXP do_getenv(SEXP call, SEXP op, SEXP args, SEXP env)
{
    int i, j;
    char *s;
    char **e;
    SEXP ans;

    char *_env[1];

    _env[0] = NULL;
    checkArity(op, args);

    if (!isString(CAR(args)))
    errorcall(call, "wrong type for argument\n");

    i = LENGTH(CAR(args));
    if (i == 0) {
    for (i = 0, e = _env; *e != NULL; i++, e++);
    PROTECT(ans = allocVector(STRSXP, i));
    for (i = 0, e = _env; *e != NULL; i++, e++)
        STRING(ans)[i] = mkChar(*e);
    } else {
    PROTECT(ans = allocVector(STRSXP, i));
    for (j = 0; j < i; j++) {
        s = getenv(CHAR(STRING(CAR(args))[j]));
        if (s == NULL)
        STRING(ans)[j] = mkChar("");
        else
        STRING(ans)[j] = mkChar(s);
    }
    }
    UNPROTECT(1);
    return (ans);
}

SEXP do_machine(SEXP call, SEXP op, SEXP args, SEXP env)
{
    return mkString("Win32");
}


/*
 * flag =0 don't wait/ignore stdout
 * flag =1 wait/ignore stdout
 * flag =2 wait/copy stdout to the console
 * flag =3 wait/return stdout
 * Add 10 to minimize application
 * Add 20 to make application "invisible"
*/


SEXP do_system(SEXP call, SEXP op, SEXP args, SEXP rho)
{
    rpipe *fp;
    char  buf[120];
    int   vis = 0, flag = 2, i = 0, j, ll;
    SEXP  tlist = R_NilValue, tchar, rval;

    checkArity(op, args);
    if (!isString(CAR(args)))
    errorcall(call, "character string expected as first argument\n");
    if (isInteger(CADR(args)))
    flag = INTEGER(CADR(args))[0];
    if (flag > 20) {
    vis = -1;
    flag -= 20;
    } else if (flag > 10) {
    vis = 0;
    flag -= 10;
    } else
    vis = 1;
    if (!isString(CADDR(args)))
    errorcall(call, "character string expected as third argument\n");
    if ((CharacterMode != RGui) && (flag == 2))
    flag = 1;
    if (CharacterMode == RGui) {
    SetStdHandle(STD_INPUT_HANDLE, INVALID_HANDLE_VALUE);
    SetStdHandle(STD_OUTPUT_HANDLE, INVALID_HANDLE_VALUE);
    SetStdHandle(STD_ERROR_HANDLE, INVALID_HANDLE_VALUE);
    }
    if (flag < 2) {
    ll = runcmd(CHAR(STRING(CAR(args))[0]), flag, vis,
            CHAR(STRING(CADDR(args))[0]));
    if (ll == NOLAUNCH)
        warning(runerror());
    } else {
    fp = rpipeOpen(CHAR(STRING(CAR(args))[0]), vis,
               CHAR(STRING(CADDR(args))[0]));
    if (!fp) {
        /* If we are returning standard output generate an error */
        if (flag == 3)
        error(runerror());
        warning(runerror());
        ll = NOLAUNCH;
    } else {
        if (flag == 3)
        PROTECT(tlist);
        for (i = 0; rpipeGets(fp, buf, 120); i++) {
        if (flag == 3) {
            ll = strlen(buf) - 1;
            if ((ll >= 0) && (buf[ll] == '\n'))
            buf[ll] = '\0';
            tchar = mkChar(buf);
            UNPROTECT(1);
            PROTECT(tlist = CONS(tchar, tlist));
        } else
            R_WriteConsole(buf, strlen(buf));
        }
        ll = rpipeClose(fp);
    }
    }
    if (flag == 3) {
    rval = allocVector(STRSXP, i);;
    for (j = (i - 1); j >= 0; j--) {
        STRING(rval)[j] = CAR(tlist);
        tlist = CDR(tlist);
    }
    UNPROTECT(1);
    return (rval);
    } else {
    tlist = allocVector(INTSXP, 1);
    INTEGER(tlist)[0] = ll;
    R_Visible = 0;
    return tlist;
    }
}

SEXP do_interactive(SEXP call, SEXP op, SEXP args, SEXP rho)
{
    SEXP  rval;

    rval = allocVector(LGLSXP, 1);
    LOGICAL(rval)[0] = R_Interactive;
    return rval;
}

#ifdef OLD
SEXP do_quit(SEXP call, SEXP op, SEXP args, SEXP rho)
{
    char *tmp;
    int   ask = 0;

    if (R_BrowseLevel) {
    warning("can't quit from browser\n");
    return R_NilValue;
    }
    if (!isString(CAR(args)))
    errorcall(call, "one of \"yes\", \"no\" or \"ask\" expected.\n");
    tmp = CHAR(STRING(CAR(args))[0]);
    if (!strcmp(tmp, "ask"))
    ask = 1;
    else if (!strcmp(tmp, "no"))
    ask = 2;
    else if (!strcmp(tmp, "yes"))
    ask = 3;
    else
    errorcall(call, "unrecognized value of ask\n");
    R_CleanUp(ask);
    exit(0);
    /* NOTREACHED */
}
#endif

void R_Suicide(char *s)
{
    char  pp[1024];

    sprintf(pp, "Fatal error: %s\n", s);
    R_ShowMessage(pp);
    R_CleanUp(SA_SUICIDE);
}


    /* Declarations to keep f77 happy */
/*
int MAIN_()  {return 0;}
int MAIN__() {return 0;}
int __main() {return 0;}
*/


/* This function can be used to display the named files with the */
/* given titles and overall title.  On GUI platforms we could */
/* use a read-only window to display the result.  Here we just */
/* make up a temporary file and invoke a pager on it. */

/*
 *     nfile   = number of files
 *     file    = array of filenames
 *     headers = the `headers' args of file.show. Printed before each file.
 *     wtitle  = title for window: the `title' arg of file.show
 *     del     = flag for whether files should be deleted after use
 *     pager   = pager to be used.
 */

int R_ShowFiles(int nfile, char **file, char **headers, char *wtitle,
        int del, char *pager)
{
    int   i;
    char  buf[1024];
    WIN32_FIND_DATA fd;

    if (nfile > 0) {
    if (pager == NULL || strlen(pager) == 0)
        pager = "internal";
    for (i = 0; i < nfile; i++) {
        if (FindFirstFile(file[i], &fd) != INVALID_HANDLE_VALUE) {
        if (!strcmp(pager, "internal")) {
            newpager(wtitle, file[i], headers[i], del);
        } else if (!strcmp(pager, "console")) {
            DWORD len = 1;
            HANDLE f = CreateFile(file[i], GENERIC_READ,
                      FILE_SHARE_WRITE,
                      NULL, OPEN_EXISTING, 0, NULL);
            if (f != INVALID_HANDLE_VALUE) {
            while (ReadFile(f, buf, 1023, &len, NULL) && len) {
                buf[len] = '\0';
                R_WriteConsole(buf,strlen(buf));
            }
            CloseHandle(f);
            if (del) DeleteFile(file[i]);
            }
            else {
            sprintf(buf,"Unable to open file '%s'", file[i]);
            warning(buf);
            }
        } else {
            sprintf(buf, "%s  %s", pager, file[i]);
            runcmd(buf, 0, 1, "");
        }
        } else {
        sprintf(buf, "file.show(): file %s does not exist\n", file[i]);
        warning(buf);
        }
    }
    return 0;
    }
    return 1;
}


/* The location of the R system files */

char *R_HomeDir()
{
    return getenv("R_HOME");
}

/* Prompt the user for a file name.  Return the length of */
/* the name typed.  On Gui platforms, this should bring up */
/* a dialog box so a user can choose files that way. */

/* from rui.c */
extern int
DialogSelectFile(char *buf,int len);

int R_ChooseFile(int new, char *buf, int len)
{
    return (DialogSelectFile(buf, len));
}

/* Unix file names which begin with "." are invisible. */
/* Macintosh file names which end with "\r" are invisible. */
/* More complex tests may be needed on other platforms. */

int R_HiddenFile(char *name)
{
    if (name && name[0] != '.')
    return 0;
    else
    return 1;
}

/* This call provides a simple interface to the "stat" */
/* system call.  This is available on the Macintosh too. */

#include <sys/types.h>
#include <sys/stat.h>

int R_FileExists(char *path)
{
    struct stat sb;
    return stat(R_ExpandFileName(path), &sb) == 0;
}