/* 
 * tclWinInit.c --
 *
 *  Contains the Windows-specific interpreter initialization functions.
 *
 * Copyright (c) 1994-1997 Sun Microsystems, Inc.
 * Copyright (c) 1998-1999 by Scriptics Corporation.
 * All rights reserved.
 *
 * RCS: @(#) Id
 */

#include "tclWinInt.h"
#include <winnt.h>
#include <winbase.h>
#include <lmcons.h>

/*
 * The following declaration is a workaround for some Microsoft brain damage.
 * The SYSTEM_INFO structure is different in various releases, even though the
 * layout is the same.  So we overlay our own structure on top of it so we
 * can access the interesting slots in a uniform way.
 */

typedef struct {
    WORD wProcessorArchitecture;
    WORD wReserved;
} OemId;

/*
 * The following macros are missing from some versions of winnt.h.
 */

#ifndef PROCESSOR_ARCHITECTURE_INTEL
#define PROCESSOR_ARCHITECTURE_INTEL 0
#endif
#ifndef PROCESSOR_ARCHITECTURE_MIPS
#define PROCESSOR_ARCHITECTURE_MIPS  1
#endif
#ifndef PROCESSOR_ARCHITECTURE_ALPHA
#define PROCESSOR_ARCHITECTURE_ALPHA 2
#endif
#ifndef PROCESSOR_ARCHITECTURE_PPC
#define PROCESSOR_ARCHITECTURE_PPC   3
#endif
#ifndef PROCESSOR_ARCHITECTURE_SHX  
#define PROCESSOR_ARCHITECTURE_SHX   4
#endif
#ifndef PROCESSOR_ARCHITECTURE_ARM
#define PROCESSOR_ARCHITECTURE_ARM   5
#endif
#ifndef PROCESSOR_ARCHITECTURE_IA64
#define PROCESSOR_ARCHITECTURE_IA64  6
#endif
#ifndef PROCESSOR_ARCHITECTURE_ALPHA64
#define PROCESSOR_ARCHITECTURE_ALPHA64 7
#endif
#ifndef PROCESSOR_ARCHITECTURE_MSIL
#define PROCESSOR_ARCHITECTURE_MSIL  8
#endif
#ifndef PROCESSOR_ARCHITECTURE_AMD64
#define PROCESSOR_ARCHITECTURE_AMD64 9
#endif
#ifndef PROCESSOR_ARCHITECTURE_IA32_ON_WIN64
#define PROCESSOR_ARCHITECTURE_IA32_ON_WIN64 10
#endif
#ifndef PROCESSOR_ARCHITECTURE_UNKNOWN
#define PROCESSOR_ARCHITECTURE_UNKNOWN 0xFFFF
#endif

/*
 * The following arrays contain the human readable strings for the Windows
 * platform and processor values.
 */


#define NUMPLATFORMS 4
static char* platforms[NUMPLATFORMS] = {
    "Win32s", "Windows 95", "Windows NT", "Windows CE"
};

#define NUMPROCESSORS 11
static char* processors[NUMPROCESSORS] = {
    "intel", "mips", "alpha", "ppc", "shx", "arm", "ia64", "alpha64", "msil",
    "amd64", "ia32_on_win64"
};

/* Used to store the encoding used for binary files */
static Tcl_Encoding binaryEncoding = NULL;
/* Has the basic library path encoding issue been fixed */
static int libraryPathEncodingFixed = 0;

/*
 * The Init script (common to Windows and Unix platforms) is
 * defined in tkInitScript.h
 */

#include "tclInitScript.h"

static void    AppendEnvironment(Tcl_Obj *listPtr, CONST char *lib);
static void    AppendDllPath(Tcl_Obj *listPtr, HMODULE hModule,
          CONST char *lib);
static int    ToUtf(CONST WCHAR *wSrc, char *dst);

/*
 *---------------------------------------------------------------------------
 *
 * TclpInitPlatform --
 *
 *  Initialize all the platform-dependant things like signals and
 *  floating-point error handling.
 *
 *  Called at process initialization time.
 *
 * Results:
 *  None.
 *
 * Side effects:
 *  None.
 *
 *---------------------------------------------------------------------------
 */

void
TclpInitPlatform()
{
    tclPlatform = TCL_PLATFORM_WINDOWS;

    /*
     * The following code stops Windows 3.X and Windows NT 3.51 from 
     * automatically putting up Sharing Violation dialogs, e.g, when 
     * someone tries to access a file that is locked or a drive with no 
     * disk in it.  Tcl already returns the appropriate error to the 
     * caller, and they can decide to put up their own dialog in response 
     * to that failure.  
     *
     * Under 95 and NT 4.0, this is a NOOP because the system doesn't 
     * automatically put up dialogs when the above operations fail.
     */

    SetErrorMode(SetErrorMode(0) | SEM_FAILCRITICALERRORS);

#ifdef STATIC_BUILD
    /*
     * If we are in a statically linked executable, then we need to
     * explicitly initialize the Windows function tables here since
     * DllMain() will not be invoked.
     */

    TclWinInit(GetModuleHandle(NULL));
#endif
}

/*
 *---------------------------------------------------------------------------
 *
 * TclpInitLibraryPath --
 *
 *  Initialize the library path at startup.  
 *
 *  This call sets the library path to strings in UTF-8. Any 
 *  pre-existing library path information is assumed to have been 
 *  in the native multibyte encoding.
 *
 *  Called at process initialization time.
 *
 * Results:
 *  Return 0, indicating that the UTF is clean.
 *
 * Side effects:
 *  None.
 *
 *---------------------------------------------------------------------------
 */

int
TclpInitLibraryPath(path)
    CONST char *path;    /* Potentially dirty UTF string that is */
        /* the path to the executable name.     */
{
#define LIBRARY_SIZE      32
    Tcl_Obj *pathPtr, *objPtr;
    CONST char *str;
    Tcl_DString ds;
    int pathc;
    CONST char **pathv;
    char installLib[LIBRARY_SIZE], developLib[LIBRARY_SIZE];

    Tcl_DStringInit(&ds);
    pathPtr = Tcl_NewObj();

    /*
     * Initialize the substrings used when locating an executable.  The
     * installLib variable computes the path as though the executable
     * is installed.  The developLib computes the path as though the
     * executable is run from a develpment directory.
     */

    sprintf(installLib, "lib/tcl%s", TCL_VERSION);
    sprintf(developLib, "tcl%s/library", TCL_PATCH_LEVEL);

    /*
     * Look for the library relative to default encoding dir.
     */

    str = Tcl_GetDefaultEncodingDir();
    if ((str != NULL) && (str[0] != '\0')) {
  objPtr = Tcl_NewStringObj(str, -1);
  Tcl_ListObjAppendElement(NULL, pathPtr, objPtr);
    }

    /*
     * Look for the library relative to the TCL_LIBRARY env variable.
     * If the last dirname in the TCL_LIBRARY path does not match the
     * last dirname in the installLib variable, use the last dir name
     * of installLib in addition to the orginal TCL_LIBRARY path.
     */

    AppendEnvironment(pathPtr, installLib);

    /*
     * Look for the library relative to the DLL.  Only use the installLib
     * because in practice, the DLL is always installed.
     */

    AppendDllPath(pathPtr, TclWinGetTclInstance(), installLib);
    

    /*
     * Look for the library relative to the executable.  This algorithm
     * should be the same as the one in the tcl_findLibrary procedure.
     *
     * This code looks in the following directories:
     *
     *  <bindir>/../<installLib>
     *    (e.g. /usr/local/bin/../lib/tcl8.4)
     *  <bindir>/../../<installLib>
     *     (e.g. /usr/local/TclPro/solaris-sparc/bin/../../lib/tcl8.4)
     *  <bindir>/../library
     *     (e.g. /usr/src/tcl8.4.0/unix/../library)
     *  <bindir>/../../library
     *    (e.g. /usr/src/tcl8.4.0/unix/solaris-sparc/../../library)
     *  <bindir>/../../<developLib>
     *    (e.g. /usr/src/tcl8.4.0/unix/../../tcl8.4.0/library)
     *  <bindir>/../../../<developLib>
     *     (e.g. /usr/src/tcl8.4.0/unix/solaris-sparc/../../../tcl8.4.0/library)
     */
     
    /*
     * The variable path holds an absolute path.  Take care not to
     * overwrite pathv[0] since that might produce a relative path.
     */

    if (path != NULL) {
  int i, origc;
  CONST char **origv;

  Tcl_SplitPath(path, &origc, &origv);
  pathc = 0;
  pathv = (CONST char **) ckalloc((unsigned int)(origc * sizeof(char *)));
  for (i=0; i< origc; i++) {
      if (origv[i][0] == '.') {
    if (strcmp(origv[i], ".") == 0) {
        /* do nothing */
    } else if (strcmp(origv[i], "..") == 0) {
        pathc--;
    } else {
        pathv[pathc++] = origv[i];
    }
      } else {
    pathv[pathc++] = origv[i];
      }
  }
  if (pathc > 2) {
      str = pathv[pathc - 2];
      pathv[pathc - 2] = installLib;
      path = Tcl_JoinPath(pathc - 1, pathv, &ds);
      pathv[pathc - 2] = str;
      objPtr = Tcl_NewStringObj(path, Tcl_DStringLength(&ds));
      Tcl_ListObjAppendElement(NULL, pathPtr, objPtr);
      Tcl_DStringFree(&ds);
  }
  if (pathc > 3) {
      str = pathv[pathc - 3];
      pathv[pathc - 3] = installLib;
      path = Tcl_JoinPath(pathc - 2, pathv, &ds);
      pathv[pathc - 3] = str;
      objPtr = Tcl_NewStringObj(path, Tcl_DStringLength(&ds));
      Tcl_ListObjAppendElement(NULL, pathPtr, objPtr);
      Tcl_DStringFree(&ds);
  }
  if (pathc > 2) {
      str = pathv[pathc - 2];
      pathv[pathc - 2] = "library";
      path = Tcl_JoinPath(pathc - 1, pathv, &ds);
      pathv[pathc - 2] = str;
      objPtr = Tcl_NewStringObj(path, Tcl_DStringLength(&ds));
      Tcl_ListObjAppendElement(NULL, pathPtr, objPtr);
      Tcl_DStringFree(&ds);
  }
  if (pathc > 3) {
      str = pathv[pathc - 3];
      pathv[pathc - 3] = "library";
      path = Tcl_JoinPath(pathc - 2, pathv, &ds);
      pathv[pathc - 3] = str;
      objPtr = Tcl_NewStringObj(path, Tcl_DStringLength(&ds));
      Tcl_ListObjAppendElement(NULL, pathPtr, objPtr);
      Tcl_DStringFree(&ds);
  }
  if (pathc > 3) {
      str = pathv[pathc - 3];
      pathv[pathc - 3] = developLib;
      path = Tcl_JoinPath(pathc - 2, pathv, &ds);
      pathv[pathc - 3] = str;
      objPtr = Tcl_NewStringObj(path, Tcl_DStringLength(&ds));
      Tcl_ListObjAppendElement(NULL, pathPtr, objPtr);
      Tcl_DStringFree(&ds);
  }
  if (pathc > 4) {
      str = pathv[pathc - 4];
      pathv[pathc - 4] = developLib;
      path = Tcl_JoinPath(pathc - 3, pathv, &ds);
      pathv[pathc - 4] = str;
      objPtr = Tcl_NewStringObj(path, Tcl_DStringLength(&ds));
      Tcl_ListObjAppendElement(NULL, pathPtr, objPtr);
      Tcl_DStringFree(&ds);
  }
  ckfree((char *) origv);
  ckfree((char *) pathv);
    }

    TclSetLibraryPath(pathPtr);

    return 0; /* 0 indicates that pathPtr is clean (true) utf */
}

/*
 *---------------------------------------------------------------------------
 *
 * AppendEnvironment --
 *
 *  Append the value of the TCL_LIBRARY environment variable onto the
 *  path pointer.  If the env variable points to another version of
 *  tcl (e.g. "tcl7.6") also append the path to this version (e.g.,
 *  "tcl7.6/../tcl8.2")
 *
 * Results:
 *  None.
 *
 * Side effects:
 *  None.
 *
 *---------------------------------------------------------------------------
 */

static void
AppendEnvironment(
    Tcl_Obj *pathPtr,
    CONST char *lib)
{
    int pathc;
    WCHAR wBuf[MAX_PATH];
    char buf[MAX_PATH * TCL_UTF_MAX];
    Tcl_Obj *objPtr;
    Tcl_DString ds;
    CONST char **pathv;
    char *shortlib;

    /*
     * The shortlib value needs to be the tail component of the
     * lib path. For example, "lib/tcl8.4" -> "tcl8.4" while
     * "usr/share/tcl8.5" -> "tcl8.5".
     */
    for (shortlib = (char *) (lib + strlen(lib) - 1); shortlib > lib ; shortlib--) {
        if (*shortlib == '/') { 
            if (shortlib == (lib + strlen(lib) - 1)) {
                Tcl_Panic("last character in lib cannot be '/'");
            }
            shortlib++;
            break;
        }
    }
    if (shortlib == lib) {
        Tcl_Panic("no '/' character found in lib");
    }

    /*
     * The "L" preceeding the TCL_LIBRARY string is used to tell VC++
     * that this is a unicode string.
     */
    
    if (GetEnvironmentVariableW(L"TCL_LIBRARY", wBuf, MAX_PATH) == 0) {
        buf[0] = '\0';
  GetEnvironmentVariableA("TCL_LIBRARY", buf, MAX_PATH);
    } else {
  ToUtf(wBuf, buf);
    }

    if (buf[0] != '\0') {
  objPtr = Tcl_NewStringObj(buf, -1);
  Tcl_ListObjAppendElement(NULL, pathPtr, objPtr);

  TclWinNoBackslash(buf);
  Tcl_SplitPath(buf, &pathc, &pathv);

  /* 
   * The lstrcmpi() will work even if pathv[pathc - 1] is random
   * UTF-8 chars because I know shortlib is ascii.
   */

  if ((pathc > 0) && (lstrcmpiA(shortlib, pathv[pathc - 1]) != 0)) {
      CONST char *str;
      /*
       * TCL_LIBRARY is set but refers to a different tcl
       * installation than the current version.  Try fiddling with the
       * specified directory to make it refer to this installation by
       * removing the old "tclX.Y" and substituting the current
       * version string.
       */
      
      pathv[pathc - 1] = shortlib;
      Tcl_DStringInit(&ds);
      str = Tcl_JoinPath(pathc, pathv, &ds);
      objPtr = Tcl_NewStringObj(str, Tcl_DStringLength(&ds));
      Tcl_DStringFree(&ds);
  } else {
      objPtr = Tcl_NewStringObj(buf, -1);
  }
  Tcl_ListObjAppendElement(NULL, pathPtr, objPtr);
  ckfree((char *) pathv);
    }
}

/*
 *---------------------------------------------------------------------------
 *
 * AppendDllPath --
 *
 *  Append a path onto the path pointer that tries to locate the Tcl
 *  library relative to the location of the Tcl DLL.
 *
 * Results:
 *  None.
 *
 * Side effects:
 *  None.
 *
 *---------------------------------------------------------------------------
 */

static void 
AppendDllPath(
    Tcl_Obj *pathPtr, 
    HMODULE hModule,
    CONST char *lib)
{
    WCHAR wName[MAX_PATH + LIBRARY_SIZE];
    char name[(MAX_PATH + LIBRARY_SIZE) * TCL_UTF_MAX];

    if (GetModuleFileNameW(hModule, wName, MAX_PATH) == 0) {
  GetModuleFileNameA(hModule, name, MAX_PATH);
    } else {
  ToUtf(wName, name);
    }
    if (lib != NULL) {
  char *end, *p;

  end = strrchr(name, '\\');
  *end = '\0';
  p = strrchr(name, '\\');
  if (p != NULL) {
      end = p;
  }
  *end = '\\';
  strcpy(end + 1, lib);
    }
    TclWinNoBackslash(name);
    Tcl_ListObjAppendElement(NULL, pathPtr, Tcl_NewStringObj(name, -1));
}

/*
 *---------------------------------------------------------------------------
 *
 * ToUtf --
 *
 *  Convert a char string to a UTF string.  
 *
 * Results:
 *  None.
 *
 * Side effects:
 *  None.
 *
 *---------------------------------------------------------------------------
 */

static int
ToUtf(
    CONST WCHAR *wSrc,
    char *dst)
{
    char *start;

    start = dst;
    while (*wSrc != '\0') {
  dst += Tcl_UniCharToUtf(*wSrc, dst);
  wSrc++;
    }
    *dst = '\0';
    return (int) (dst - start);
}

/*
 *---------------------------------------------------------------------------
 *
 * TclWinEncodingsCleanup --
 *
 *  Reset information to its original state in finalization to
 *  allow for reinitialization to be possible.  This must not
 *  be called until after the filesystem has been finalised, or
 *  exit crashes may occur when using virtual filesystems.
 *
 * Results:
 *  None.
 *
 * Side effects:
 *  Static information reset to startup state.
 *
 *---------------------------------------------------------------------------
 */

void
TclWinEncodingsCleanup()
{
    TclWinResetInterfaceEncodings();
    libraryPathEncodingFixed = 0;
    if (binaryEncoding != NULL) {
  Tcl_FreeEncoding(binaryEncoding);
  binaryEncoding = NULL;
    }
}

/*
 *---------------------------------------------------------------------------
 *
 * TclpSetInitialEncodings --
 *
 *  Based on the locale, determine the encoding of the operating
 *  system and the default encoding for newly opened files.
 *
 *  Called at process initialization time, and part way through
 *  startup, we verify that the initial encodings were correctly
 *  setup.  Depending on Tcl's environment, there may not have been
 *  enough information first time through (above).
 *
 * Results:
 *  None.
 *
 * Side effects:
 *  The Tcl library path is converted from native encoding to UTF-8,
 *  on the first call, and the encodings may be changed on first or
 *  second call.
 *
 *---------------------------------------------------------------------------
 */

void
TclpSetInitialEncodings()
{
    CONST char *encoding;
    char buf[4 + TCL_INTEGER_SPACE];

    if (libraryPathEncodingFixed == 0) {
  int platformId, useWide;

  platformId = TclWinGetPlatformId();
  useWide = ((platformId == VER_PLATFORM_WIN32_NT)
    || (platformId == VER_PLATFORM_WIN32_CE));
  TclWinSetInterfaces(useWide);

  wsprintfA(buf, "cp%d", GetACP());
  Tcl_SetSystemEncoding(NULL, buf);

  if (!useWide) {
      Tcl_Obj *pathPtr = TclGetLibraryPath();
      if (pathPtr != NULL) {
    int i, objc;
    Tcl_Obj **objv;
    
    objc = 0;
    Tcl_ListObjGetElements(NULL, pathPtr, &objc, &objv);
    for (i = 0; i < objc; i++) {
        int length;
        char *string;
        Tcl_DString ds;

        string = Tcl_GetStringFromObj(objv[i], &length);
        Tcl_ExternalToUtfDString(NULL, string, length, &ds);
        Tcl_SetStringObj(objv[i], Tcl_DStringValue(&ds), 
          Tcl_DStringLength(&ds));
        Tcl_DStringFree(&ds);
    }
      }
  }
  
  libraryPathEncodingFixed = 1;
    } else {
  wsprintfA(buf, "cp%d", GetACP());
  Tcl_SetSystemEncoding(NULL, buf);
    }

    /* This is only ever called from the startup thread */
    if (binaryEncoding == NULL) {
  /*
   * Keep this encoding preloaded.  The IO package uses it for
   * gets on a binary channel.
   */
  encoding = "iso8859-1";
  binaryEncoding = Tcl_GetEncoding(NULL, encoding);
    }
}

/*
 *---------------------------------------------------------------------------
 *
 * TclpSetVariables --
 *
 *  Performs platform-specific interpreter initialization related to
 *  the tcl_platform and env variables, and other platform-specific
 *  things.
 *
 * Results:
 *  None.
 *
 * Side effects:
 *  Sets "tcl_platform", and "env(HOME)" Tcl variables.
 *
 *----------------------------------------------------------------------
 */

void
TclpSetVariables(interp)
    Tcl_Interp *interp;    /* Interp to initialize. */  
{      
    CONST char *ptr;
    char buffer[TCL_INTEGER_SPACE * 2];
    SYSTEM_INFO sysInfo;
    OemId *oemId;
    OSVERSIONINFOA osInfo;
    Tcl_DString ds;
    TCHAR szUserName[ UNLEN+1 ];
    DWORD dwUserNameLen = sizeof(szUserName);

    osInfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFOA);
    GetVersionExA(&osInfo);

    oemId = (OemId *) &sysInfo;
    GetSystemInfo(&sysInfo);

    /*
     * Define the tcl_platform array.
     */

    Tcl_SetVar2(interp, "tcl_platform", "platform", "windows",
      TCL_GLOBAL_ONLY);
    if (osInfo.dwPlatformId < NUMPLATFORMS) {
  Tcl_SetVar2(interp, "tcl_platform", "os",
    platforms[osInfo.dwPlatformId], TCL_GLOBAL_ONLY);
    }
    wsprintfA(buffer, "%d.%d", osInfo.dwMajorVersion, osInfo.dwMinorVersion);
    Tcl_SetVar2(interp, "tcl_platform", "osVersion", buffer, TCL_GLOBAL_ONLY);
    if (oemId->wProcessorArchitecture < NUMPROCESSORS) {
  Tcl_SetVar2(interp, "tcl_platform", "machine",
    processors[oemId->wProcessorArchitecture],
    TCL_GLOBAL_ONLY);
    }

#ifdef _DEBUG
    /*
     * The existence of the "debug" element of the tcl_platform array indicates
     * that this particular Tcl shell has been compiled with debug information.
     * Using "info exists tcl_platform(debug)" a Tcl script can direct the 
     * interpreter to load debug versions of DLLs with the load command.
     */

    Tcl_SetVar2(interp, "tcl_platform", "debug", "1",
      TCL_GLOBAL_ONLY);
#endif

    /*
     * Set up the HOME environment variable from the HOMEDRIVE & HOMEPATH
     * environment variables, if necessary.
     */

    Tcl_DStringInit(&ds);
    ptr = Tcl_GetVar2(interp, "env", "HOME", TCL_GLOBAL_ONLY);
    if (ptr == NULL) {
  ptr = Tcl_GetVar2(interp, "env", "HOMEDRIVE", TCL_GLOBAL_ONLY);
  if (ptr != NULL) {
      Tcl_DStringAppend(&ds, ptr, -1);
  }
  ptr = Tcl_GetVar2(interp, "env", "HOMEPATH", TCL_GLOBAL_ONLY);
  if (ptr != NULL) {
      Tcl_DStringAppend(&ds, ptr, -1);
  }
  if (Tcl_DStringLength(&ds) > 0) {
      Tcl_SetVar2(interp, "env", "HOME", Tcl_DStringValue(&ds),
        TCL_GLOBAL_ONLY);
  } else {
      Tcl_SetVar2(interp, "env", "HOME", "c:\\", TCL_GLOBAL_ONLY);
  }
    }

    /*
     * Initialize the user name from the environment first, since this is much
     * faster than asking the system.
     */

    Tcl_DStringInit( &ds );
    if (TclGetEnv("USERNAME", &ds) == NULL) {

  if ( GetUserName( szUserName, &dwUserNameLen ) != 0 ) {
      Tcl_WinTCharToUtf( szUserName, dwUserNameLen, &ds );
  }  
    }
    Tcl_SetVar2(interp, "tcl_platform", "user", Tcl_DStringValue(&ds),
      TCL_GLOBAL_ONLY);
    Tcl_DStringFree(&ds);
}

/*
 *----------------------------------------------------------------------
 *
 * TclpFindVariable --
 *
 *  Locate the entry in environ for a given name.  On Unix this 
 *  routine is case sensetive, on Windows this matches mioxed case.
 *
 * Results:
 *  The return value is the index in environ of an entry with the
 *  name "name", or -1 if there is no such entry.   The integer at
 *  *lengthPtr is filled in with the length of name (if a matching
 *  entry is found) or the length of the environ array (if no matching
 *  entry is found).
 *
 * Side effects:
 *  None.
 *
 *----------------------------------------------------------------------
 */

int
TclpFindVariable(name, lengthPtr)
    CONST char *name;    /* Name of desired environment variable
         * (UTF-8). */
    int *lengthPtr;    /* Used to return length of name (for
         * successful searches) or number of non-NULL
         * entries in environ (for unsuccessful
         * searches). */
{
    int i, length, result = -1;
    register CONST char *env, *p1, *p2;
    char *envUpper, *nameUpper;
    Tcl_DString envString;

    /*
     * Convert the name to all upper case for the case insensitive
     * comparison.
     */

    length = strlen(name);
    nameUpper = (char *) ckalloc((unsigned) length+1);
    memcpy((VOID *) nameUpper, (VOID *) name, (size_t) length+1);
    Tcl_UtfToUpper(nameUpper);
    
    Tcl_DStringInit(&envString);
    for (i = 0, env = environ[i]; env != NULL; i++, env = environ[i]) {
  /*
   * Chop the env string off after the equal sign, then Convert
   * the name to all upper case, so we do not have to convert
   * all the characters after the equal sign.
   */
  
  envUpper = Tcl_ExternalToUtfDString(NULL, env, -1, &envString);
  p1 = strchr(envUpper, '=');
  if (p1 == NULL) {
      continue;
  }
  length = (int) (p1 - envUpper);
  Tcl_DStringSetLength(&envString, length+1);
  Tcl_UtfToUpper(envUpper);

  p1 = envUpper;
  p2 = nameUpper;
  for (; *p2 == *p1; p1++, p2++) {
      /* NULL loop body. */
  }
  if ((*p1 == '=') && (*p2 == '\0')) {
      *lengthPtr = length;
      result = i;
      goto done;
  }
  
  Tcl_DStringFree(&envString);
    }
    
    *lengthPtr = i;

    done:
    Tcl_DStringFree(&envString);
    ckfree(nameUpper);
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_Init --
 *
 *  This procedure is typically invoked by Tcl_AppInit procedures
 *  to perform additional initialization for a Tcl interpreter,
 *  such as sourcing the "init.tcl" script.
 *
 * Results:
 *  Returns a standard Tcl completion code and sets the interp's
 *  result if there is an error.
 *
 * Side effects:
 *  Depends on what's in the init.tcl script.
 *
 *----------------------------------------------------------------------
 */

int
Tcl_Init(interp)
    Tcl_Interp *interp;    /* Interpreter to initialize. */
{
    Tcl_Obj *pathPtr;

    if (tclPreInitScript != NULL) {
  if (Tcl_Eval(interp, tclPreInitScript) == TCL_ERROR) {
      return (TCL_ERROR);
  };
    }

    pathPtr = TclGetLibraryPath();
    if (pathPtr == NULL) {
  pathPtr = Tcl_NewObj();
    }
    Tcl_IncrRefCount(pathPtr);    
    Tcl_SetVar2Ex(interp, "tcl_libPath", NULL, pathPtr, TCL_GLOBAL_ONLY);
    Tcl_DecrRefCount(pathPtr);    
    return Tcl_Eval(interp, initScript);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_SourceRCFile --
 *
 *  This procedure is typically invoked by Tcl_Main of Tk_Main
 *  procedure to source an application specific rc file into the
 *  interpreter at startup time.
 *
 * Results:
 *  None.
 *
 * Side effects:
 *  Depends on what's in the rc script.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_SourceRCFile(interp)
    Tcl_Interp *interp;    /* Interpreter to source rc file into. */
{
    Tcl_DString temp;
    CONST char *fileName;
    Tcl_Channel errChannel;

    fileName = Tcl_GetVar(interp, "tcl_rcFileName", TCL_GLOBAL_ONLY);

    if (fileName != NULL) {
        Tcl_Channel c;
  CONST char *fullName;

        Tcl_DStringInit(&temp);
  fullName = Tcl_TranslateFileName(interp, fileName, &temp);
  if (fullName == NULL) {
      /*
       * Couldn't translate the file name (e.g. it referred to a
       * bogus user or there was no HOME environment variable).
       * Just do nothing.
       */
  } else {

      /*
       * Test for the existence of the rc file before trying to read it.
       */

            c = Tcl_OpenFileChannel(NULL, fullName, "r", 0);
            if (c != (Tcl_Channel) NULL) {
                Tcl_Close(NULL, c);
    if (Tcl_EvalFile(interp, fullName) != TCL_OK) {
        errChannel = Tcl_GetStdChannel(TCL_STDERR);
        if (errChannel) {
      Tcl_WriteObj(errChannel, Tcl_GetObjResult(interp));
      Tcl_WriteChars(errChannel, "\n", 1);
        }
    }
      }
  }
        Tcl_DStringFree(&temp);
    }
}
