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tclFileName.c

/* 
 * tclFileName.c --
 *
 *    This file contains routines for converting file names betwen
 *    native and network form.
 *
 * Copyright (c) 1995-1998 Sun Microsystems, Inc.
 * Copyright (c) 1998-1999 by Scriptics Corporation.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tclFileName.c,v 1.40.2.11 2005/06/21 19:07:41 kennykb Exp $
 */

#include "tclInt.h"
#include "tclPort.h"
#include "tclRegexp.h"

/* 
 * This define is used to activate Tcl's interpretation of Unix-style
 * paths (containing forward slashes, '.' and '..') on MacOS.  A 
 * side-effect of this is that some paths become ambiguous.
 */
#define MAC_UNDERSTANDS_UNIX_PATHS

#ifdef MAC_UNDERSTANDS_UNIX_PATHS
/*
 * The following regular expression matches the root portion of a Macintosh
 * absolute path.  It will match degenerate Unix-style paths, tilde paths,
 * Unix-style paths, and Mac paths.  The various subexpressions in this
 * can be summarised as follows: ^(/..|~user/unix|~user:mac|/unix|mac:dir).
 * The subexpression indices which match the root portions, are as follows:
 * 
 * degenerate unix-style: 2
 * unix-tilde: 5
 * mac-tilde: 7
 * unix-style: 9 (or 10 to cut off the irrelevant header).
 * mac: 12
 * 
 */

#define MAC_ROOT_PATTERN "^((/+([.][.]?/+)*([.][.]?)?)|(~[^:/]*)(/[^:]*)?|(~[^:]*)(:.*)?|/+([.][.]?/+)*([^:/]+)(/[^:]*)?|([^:]+):.*)$"

/*
 * The following variables are used to hold precompiled regular expressions
 * for use in filename matching.
 */

typedef struct ThreadSpecificData {
    int initialized;
    Tcl_Obj *macRootPatternPtr;
} ThreadSpecificData;

static Tcl_ThreadDataKey dataKey;

static void       FileNameCleanup _ANSI_ARGS_((ClientData clientData));
static void       FileNameInit _ANSI_ARGS_((void));

#endif

/*
 * The following variable is set in the TclPlatformInit call to one
 * of: TCL_PLATFORM_UNIX, TCL_PLATFORM_MAC, or TCL_PLATFORM_WINDOWS.
 */

TclPlatformType tclPlatform = TCL_PLATFORM_UNIX;

/*
 * Prototypes for local procedures defined in this file:
 */

static CONST char *     DoTildeSubst _ANSI_ARGS_((Tcl_Interp *interp,
                      CONST char *user, Tcl_DString *resultPtr));
static CONST char *     ExtractWinRoot _ANSI_ARGS_((CONST char *path,
                      Tcl_DString *resultPtr, int offset, 
                      Tcl_PathType *typePtr));
static int        SkipToChar _ANSI_ARGS_((char **stringPtr,
                      char *match));
static Tcl_Obj*         SplitMacPath _ANSI_ARGS_((CONST char *path));
static Tcl_Obj*         SplitWinPath _ANSI_ARGS_((CONST char *path));
static Tcl_Obj*         SplitUnixPath _ANSI_ARGS_((CONST char *path));
#ifdef MAC_UNDERSTANDS_UNIX_PATHS

/*
 *----------------------------------------------------------------------
 *
 * FileNameInit --
 *
 *    This procedure initializes the patterns used by this module.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    Compiles the regular expressions.
 *
 *----------------------------------------------------------------------
 */

static void
FileNameInit()
{
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
    if (!tsdPtr->initialized) {
      tsdPtr->initialized = 1;
      tsdPtr->macRootPatternPtr = Tcl_NewStringObj(MAC_ROOT_PATTERN, -1);
      Tcl_CreateThreadExitHandler(FileNameCleanup, NULL);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * FileNameCleanup --
 *
 *    This procedure is a Tcl_ExitProc used to clean up the static
 *    data structures used in this file.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    Deallocates storage used by the procedures in this file.
 *
 *----------------------------------------------------------------------
 */

static void
FileNameCleanup(clientData)
    ClientData clientData;    /* Not used. */
{
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
    Tcl_DecrRefCount(tsdPtr->macRootPatternPtr);
    tsdPtr->initialized = 0;
}
#endif

/*
 *----------------------------------------------------------------------
 *
 * ExtractWinRoot --
 *
 *    Matches the root portion of a Windows path and appends it
 *    to the specified Tcl_DString.
 *    
 * Results:
 *    Returns the position in the path immediately after the root
 *    including any trailing slashes.
 *    Appends a cleaned up version of the root to the Tcl_DString
 *    at the specified offest.
 *
 * Side effects:
 *    Modifies the specified Tcl_DString.
 *
 *----------------------------------------------------------------------
 */

static CONST char *
ExtractWinRoot(path, resultPtr, offset, typePtr)
    CONST char *path;         /* Path to parse. */
    Tcl_DString *resultPtr;   /* Buffer to hold result. */
    int offset;               /* Offset in buffer where result should be
                         * stored. */
    Tcl_PathType *typePtr;    /* Where to store pathType result */
{
    if (path[0] == '/' || path[0] == '\\') {
      /* Might be a UNC or Vol-Relative path */
      CONST char *host, *share, *tail;
      int hlen, slen;
      if (path[1] != '/' && path[1] != '\\') {
          Tcl_DStringSetLength(resultPtr, offset);
          *typePtr = TCL_PATH_VOLUME_RELATIVE;
          Tcl_DStringAppend(resultPtr, "/", 1);
          return &path[1];
      }
      host = &path[2];

      /* Skip separators */
      while (host[0] == '/' || host[0] == '\\') host++;

      for (hlen = 0; host[hlen];hlen++) {
          if (host[hlen] == '/' || host[hlen] == '\\')
            break;
      }
      if (host[hlen] == 0 || host[hlen+1] == 0) {
          /* 
           * The path given is simply of the form 
           * '/foo', '//foo', '/////foo' or the same
           * with backslashes.  If there is exactly
           * one leading '/' the path is volume relative
           * (see filename man page).  If there are more
           * than one, we are simply assuming they
           * are superfluous and we trim them away.
           * (An alternative interpretation would
           * be that it is a host name, but we have
           * been documented that that is not the case).
           */
          *typePtr = TCL_PATH_VOLUME_RELATIVE;
          Tcl_DStringAppend(resultPtr, "/", 1);
          return &path[2];
      }
      Tcl_DStringSetLength(resultPtr, offset);
      share = &host[hlen];

      /* Skip separators */
      while (share[0] == '/' || share[0] == '\\') share++;

      for (slen = 0; share[slen];slen++) {
          if (share[slen] == '/' || share[slen] == '\\')
            break;
      }
      Tcl_DStringAppend(resultPtr, "//", 2);
      Tcl_DStringAppend(resultPtr, host, hlen);
      Tcl_DStringAppend(resultPtr, "/", 1);
      Tcl_DStringAppend(resultPtr, share, slen);

      tail = &share[slen];

      /* Skip separators */
      while (tail[0] == '/' || tail[0] == '\\') tail++;

      *typePtr = TCL_PATH_ABSOLUTE;
      return tail;
    } else if (*path && path[1] == ':') {
      /* Might be a drive sep */
      Tcl_DStringSetLength(resultPtr, offset);

      if (path[2] != '/' && path[2] != '\\') {
          *typePtr = TCL_PATH_VOLUME_RELATIVE;
          Tcl_DStringAppend(resultPtr, path, 2);
          return &path[2];
      } else {
          char *tail = (char*)&path[3];

          /* Skip separators */
          while (*tail && (tail[0] == '/' || tail[0] == '\\')) tail++;

          *typePtr = TCL_PATH_ABSOLUTE;
          Tcl_DStringAppend(resultPtr, path, 2);
          Tcl_DStringAppend(resultPtr, "/", 1);

          return tail;
      }
    } else {
      int abs = 0;
      if ((path[0] == 'c' || path[0] == 'C') 
          && (path[1] == 'o' || path[1] == 'O')) {
          if ((path[2] == 'm' || path[2] == 'M')
            && path[3] >= '1' && path[3] <= '4') {
            /* May have match for 'com[1-4]:?', which is a serial port */
            if (path[4] == '\0') {
                abs = 4;
            } else if (path [4] == ':' && path[5] == '\0') {
                abs = 5;
            }
          } else if ((path[2] == 'n' || path[2] == 'N') && path[3] == '\0') {
            /* Have match for 'con' */
            abs = 3;
          }
      } else if ((path[0] == 'l' || path[0] == 'L')
               && (path[1] == 'p' || path[1] == 'P')
               && (path[2] == 't' || path[2] == 'T')) {
          if (path[3] >= '1' && path[3] <= '3') {
            /* May have match for 'lpt[1-3]:?' */
            if (path[4] == '\0') {
                abs = 4;
            } else if (path [4] == ':' && path[5] == '\0') {
                abs = 5;
            }
          }
      } else if ((path[0] == 'p' || path[0] == 'P')
               && (path[1] == 'r' || path[1] == 'R')
               && (path[2] == 'n' || path[2] == 'N')
               && path[3] == '\0') {
          /* Have match for 'prn' */
          abs = 3;
      } else if ((path[0] == 'n' || path[0] == 'N')
               && (path[1] == 'u' || path[1] == 'U')
               && (path[2] == 'l' || path[2] == 'L')
               && path[3] == '\0') {
          /* Have match for 'nul' */
          abs = 3;
      } else if ((path[0] == 'a' || path[0] == 'A')
               && (path[1] == 'u' || path[1] == 'U')
               && (path[2] == 'x' || path[2] == 'X')
               && path[3] == '\0') {
          /* Have match for 'aux' */
          abs = 3;
      }
      if (abs != 0) {
          *typePtr = TCL_PATH_ABSOLUTE;
          Tcl_DStringSetLength(resultPtr, offset);
          Tcl_DStringAppend(resultPtr, path, abs);
          return path + abs;
      }
    }
    /* Anything else is treated as relative */
    *typePtr = TCL_PATH_RELATIVE;
    return path;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_GetPathType --
 *
 *    Determines whether a given path is relative to the current
 *    directory, relative to the current volume, or absolute.
 *    
 *    The objectified Tcl_FSGetPathType should be used in
 *    preference to this function (as you can see below, this
 *    is just a wrapper around that other function).
 *
 * Results:
 *    Returns one of TCL_PATH_ABSOLUTE, TCL_PATH_RELATIVE, or
 *    TCL_PATH_VOLUME_RELATIVE.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

Tcl_PathType
Tcl_GetPathType(path)
    CONST char *path;
{
    Tcl_PathType type;
    Tcl_Obj *tempObj = Tcl_NewStringObj(path,-1);
    Tcl_IncrRefCount(tempObj);
    type = Tcl_FSGetPathType(tempObj);
    Tcl_DecrRefCount(tempObj);
    return type;
}

/*
 *----------------------------------------------------------------------
 *
 * TclpGetNativePathType --
 *
 *    Determines whether a given path is relative to the current
 *    directory, relative to the current volume, or absolute, but
 *    ONLY FOR THE NATIVE FILESYSTEM. This function is called from
 *    tclIOUtil.c (but needs to be here due to its dependence on
 *    static variables/functions in this file).  The exported
 *    function Tcl_FSGetPathType should be used by extensions.
 *
 * Results:
 *    Returns one of TCL_PATH_ABSOLUTE, TCL_PATH_RELATIVE, or
 *    TCL_PATH_VOLUME_RELATIVE.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

Tcl_PathType
TclpGetNativePathType(pathObjPtr, driveNameLengthPtr, driveNameRef)
    Tcl_Obj *pathObjPtr;
    int *driveNameLengthPtr;
    Tcl_Obj **driveNameRef;
{
    Tcl_PathType type = TCL_PATH_ABSOLUTE;
    int pathLen;
    char *path = Tcl_GetStringFromObj(pathObjPtr, &pathLen);
    
    if (path[0] == '~') {
      /* 
       * This case is common to all platforms.
       * Paths that begin with ~ are absolute.
       */
      if (driveNameLengthPtr != NULL) {
          char *end = path + 1;
          while ((*end != '\0') && (*end != '/')) {
            end++;
          }
          *driveNameLengthPtr = end - path;
      }
    } else {
      switch (tclPlatform) {
          case TCL_PLATFORM_UNIX: {
            char *origPath = path;
              
            /*
             * Paths that begin with / are absolute.
             */

#ifdef __QNX__
            /*
             * Check for QNX //<node id> prefix
             */
            if (*path && (pathLen > 3) && (path[0] == '/') 
              && (path[1] == '/') && isdigit(UCHAR(path[2]))) {
                path += 3;
                while (isdigit(UCHAR(*path))) {
                  ++path;
                }
            }
#endif
            if (path[0] == '/') {
                if (driveNameLengthPtr != NULL) {
                  /* 
                   * We need this addition in case the QNX code 
                   * was used 
                   */
                  *driveNameLengthPtr = (1 + path - origPath);
                }
            } else {
                type = TCL_PATH_RELATIVE;
            }
            break;
          }
          case TCL_PLATFORM_MAC:
            if (path[0] == ':') {
                type = TCL_PATH_RELATIVE;
            } else {
#ifdef MAC_UNDERSTANDS_UNIX_PATHS
                ThreadSpecificData *tsdPtr;
                Tcl_RegExp re;

                tsdPtr = TCL_TSD_INIT(&dataKey);

                /*
                 * Since we have eliminated the easy cases, use the
                 * root pattern to look for the other types.
                 */

                FileNameInit();
                re = Tcl_GetRegExpFromObj(NULL, tsdPtr->macRootPatternPtr,
                      REG_ADVANCED);

                if (!Tcl_RegExpExec(NULL, re, path, path)) {
                  type = TCL_PATH_RELATIVE;
                } else {
                  CONST char *root, *end;
                  Tcl_RegExpRange(re, 2, &root, &end);
                  if (root != NULL) {
                      type = TCL_PATH_RELATIVE;
                  } else {
                      if (driveNameLengthPtr != NULL) {
                        Tcl_RegExpRange(re, 0, &root, &end);
                        *driveNameLengthPtr = end - root;
                      }
                      if (driveNameRef != NULL) {
                        if (*root == '/') {
                            char *c;
                            int gotColon = 0;
                            *driveNameRef = Tcl_NewStringObj(root + 1,
                                  end - root -1);
                            c = Tcl_GetString(*driveNameRef);
                            while (*c != '\0') {
                              if (*c == '/') {
                                  gotColon++;
                                  *c = ':';
                              }
                              c++;
                            }
                            /* 
                             * If there is no colon, we have just a
                             * volume name so we must add a colon so
                             * it is an absolute path.
                             */
                            if (gotColon == 0) {
                                Tcl_AppendToObj(*driveNameRef, ":", 1);
                            } else if ((gotColon > 1) &&
                                  (*(c-1) == ':')) {
                              /* We have an extra colon */
                                Tcl_SetObjLength(*driveNameRef, 
                                c - Tcl_GetString(*driveNameRef) - 1);
                            }
                        }
                      }
                  }
                }
#else
                if (path[0] == '~') {
                } else if (path[0] == ':') {
                  type = TCL_PATH_RELATIVE;
                } else {
                  char *colonPos = strchr(path,':');
                  if (colonPos == NULL) {
                      type = TCL_PATH_RELATIVE;
                  } else {
                  }
                }
                if (type == TCL_PATH_ABSOLUTE) {
                  if (driveNameLengthPtr != NULL) {
                      *driveNameLengthPtr = strlen(path);
                  }
                }
#endif
            }
            break;
          
          case TCL_PLATFORM_WINDOWS: {
            Tcl_DString ds;
            CONST char *rootEnd;
            
            Tcl_DStringInit(&ds);
            rootEnd = ExtractWinRoot(path, &ds, 0, &type);
            if ((rootEnd != path) && (driveNameLengthPtr != NULL)) {
                *driveNameLengthPtr = rootEnd - path;
                if (driveNameRef != NULL) {
                  *driveNameRef = Tcl_NewStringObj(Tcl_DStringValue(&ds),
                        Tcl_DStringLength(&ds));
                  Tcl_IncrRefCount(*driveNameRef);
                }
            }
            Tcl_DStringFree(&ds);
            break;
          }
      }
    }
    return type;
}

/*
 *---------------------------------------------------------------------------
 *
 * TclpNativeSplitPath --
 *
 *      This function takes the given Tcl_Obj, which should be a valid
 *      path, and returns a Tcl List object containing each segment
 *      of that path as an element.
 *
 *      Note this function currently calls the older Split(Plat)Path
 *      functions, which require more memory allocation than is
 *      desirable.
 *      
 * Results:
 *      Returns list object with refCount of zero.  If the passed in
 *      lenPtr is non-NULL, we use it to return the number of elements
 *      in the returned list.
 *
 * Side effects:
 *    None.
 *
 *---------------------------------------------------------------------------
 */

Tcl_Obj* 
TclpNativeSplitPath(pathPtr, lenPtr)
    Tcl_Obj *pathPtr;         /* Path to split. */
    int *lenPtr;        /* int to store number of path elements. */
{
    Tcl_Obj *resultPtr = NULL;  /* Needed only to prevent gcc warnings. */

    /*
     * Perform platform specific splitting. 
     */

    switch (tclPlatform) {
      case TCL_PLATFORM_UNIX:
          resultPtr = SplitUnixPath(Tcl_GetString(pathPtr));
          break;

      case TCL_PLATFORM_WINDOWS:
          resultPtr = SplitWinPath(Tcl_GetString(pathPtr));
          break;
          
      case TCL_PLATFORM_MAC:
          resultPtr = SplitMacPath(Tcl_GetString(pathPtr));
          break;
    }

    /*
     * Compute the number of elements in the result.
     */

    if (lenPtr != NULL) {
      Tcl_ListObjLength(NULL, resultPtr, lenPtr);
    }
    return resultPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_SplitPath --
 *
 *    Split a path into a list of path components.  The first element
 *    of the list will have the same path type as the original path.
 *
 * Results:
 *    Returns a standard Tcl result.  The interpreter result contains
 *    a list of path components.
 *    *argvPtr will be filled in with the address of an array
 *    whose elements point to the elements of path, in order.
 *    *argcPtr will get filled in with the number of valid elements
 *    in the array.  A single block of memory is dynamically allocated
 *    to hold both the argv array and a copy of the path elements.
 *    The caller must eventually free this memory by calling ckfree()
 *    on *argvPtr.  Note:  *argvPtr and *argcPtr are only modified
 *    if the procedure returns normally.
 *
 * Side effects:
 *    Allocates memory.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_SplitPath(path, argcPtr, argvPtr)
    CONST char *path;         /* Pointer to string containing a path. */
    int *argcPtr;       /* Pointer to location to fill in with
                         * the number of elements in the path. */
    CONST char ***argvPtr;    /* Pointer to place to store pointer to array
                         * of pointers to path elements. */
{
    Tcl_Obj *resultPtr = NULL;  /* Needed only to prevent gcc warnings. */
    Tcl_Obj *tmpPtr, *eltPtr;
    int i, size, len;
    char *p, *str;

    /*
     * Perform the splitting, using objectified, vfs-aware code.
     */

    tmpPtr = Tcl_NewStringObj(path, -1);
    Tcl_IncrRefCount(tmpPtr);
    resultPtr = Tcl_FSSplitPath(tmpPtr, argcPtr);
    Tcl_DecrRefCount(tmpPtr);

    /* Calculate space required for the result */
    
    size = 1;
    for (i = 0; i < *argcPtr; i++) {
      Tcl_ListObjIndex(NULL, resultPtr, i, &eltPtr);
      Tcl_GetStringFromObj(eltPtr, &len);
      size += len + 1;
    }
    
    /*
     * Allocate a buffer large enough to hold the contents of all of
     * the list plus the argv pointers and the terminating NULL pointer.
     */

    *argvPtr = (CONST char **) ckalloc((unsigned)
          ((((*argcPtr) + 1) * sizeof(char *)) + size));

    /*
     * Position p after the last argv pointer and copy the contents of
     * the list in, piece by piece.
     */

    p = (char *) &(*argvPtr)[(*argcPtr) + 1];
    for (i = 0; i < *argcPtr; i++) {
      Tcl_ListObjIndex(NULL, resultPtr, i, &eltPtr);
      str = Tcl_GetStringFromObj(eltPtr, &len);
      memcpy((VOID *) p, (VOID *) str, (size_t) len+1);
      p += len+1;
    }
    
    /*
     * Now set up the argv pointers.
     */

    p = (char *) &(*argvPtr)[(*argcPtr) + 1];

    for (i = 0; i < *argcPtr; i++) {
      (*argvPtr)[i] = p;
      while ((*p++) != '\0') {}
    }
    (*argvPtr)[i] = NULL;

    /*
     * Free the result ptr given to us by Tcl_FSSplitPath
     */

    Tcl_DecrRefCount(resultPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * SplitUnixPath --
 *
 *    This routine is used by Tcl_(FS)SplitPath to handle splitting
 *    Unix paths.
 *
 * Results:
 *    Returns a newly allocated Tcl list object.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

static Tcl_Obj*
SplitUnixPath(path)
    CONST char *path;         /* Pointer to string containing a path. */
{
    int length;
    CONST char *p, *elementStart;
    Tcl_Obj *result = Tcl_NewObj();

    /*
     * Deal with the root directory as a special case.
     */

#ifdef __QNX__
    /*
     * Check for QNX //<node id> prefix
     */
    if ((path[0] == '/') && (path[1] == '/')
          && isdigit(UCHAR(path[2]))) { /* INTL: digit */
      path += 3;
      while (isdigit(UCHAR(*path))) { /* INTL: digit */
          ++path;
      }
    }
#endif

    if (path[0] == '/') {
      Tcl_ListObjAppendElement(NULL, result, Tcl_NewStringObj("/",1));
      p = path+1;
    } else {
      p = path;
    }

    /*
     * Split on slashes.  Embedded elements that start with tilde will be
     * prefixed with "./" so they are not affected by tilde substitution.
     */

    for (;;) {
      elementStart = p;
      while ((*p != '\0') && (*p != '/')) {
          p++;
      }
      length = p - elementStart;
      if (length > 0) {
          Tcl_Obj *nextElt;
          if ((elementStart[0] == '~') && (elementStart != path)) {
            nextElt = Tcl_NewStringObj("./",2);
            Tcl_AppendToObj(nextElt, elementStart, length);
          } else {
            nextElt = Tcl_NewStringObj(elementStart, length);
          }
          Tcl_ListObjAppendElement(NULL, result, nextElt);
      }
      if (*p++ == '\0') {
          break;
      }
    }
    return result;
}


/*
 *----------------------------------------------------------------------
 *
 * SplitWinPath --
 *
 *    This routine is used by Tcl_(FS)SplitPath to handle splitting
 *    Windows paths.
 *
 * Results:
 *    Returns a newly allocated Tcl list object.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

static Tcl_Obj*
SplitWinPath(path)
    CONST char *path;         /* Pointer to string containing a path. */
{
    int length;
    CONST char *p, *elementStart;
    Tcl_PathType type = TCL_PATH_ABSOLUTE;
    Tcl_DString buf;
    Tcl_Obj *result = Tcl_NewObj();
    Tcl_DStringInit(&buf);
    
    p = ExtractWinRoot(path, &buf, 0, &type);

    /*
     * Terminate the root portion, if we matched something.
     */

    if (p != path) {
      Tcl_ListObjAppendElement(NULL, result, 
                         Tcl_NewStringObj(Tcl_DStringValue(&buf), 
                                      Tcl_DStringLength(&buf)));
    }
    Tcl_DStringFree(&buf);
    
    /*
     * Split on slashes.  Embedded elements that start with tilde 
     * or a drive letter will be prefixed with "./" so they are not 
     * affected by tilde substitution.
     */

    do {
      elementStart = p;
      while ((*p != '\0') && (*p != '/') && (*p != '\\')) {
          p++;
      }
      length = p - elementStart;
      if (length > 0) {
          Tcl_Obj *nextElt;
          if ((elementStart != path)
            && ((elementStart[0] == '~')
                || (isalpha(UCHAR(elementStart[0]))
                  && elementStart[1] == ':'))) {
            nextElt = Tcl_NewStringObj("./",2);
            Tcl_AppendToObj(nextElt, elementStart, length);
          } else {
            nextElt = Tcl_NewStringObj(elementStart, length);
          }
          Tcl_ListObjAppendElement(NULL, result, nextElt);
      }
    } while (*p++ != '\0');

    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * SplitMacPath --
 *
 *    This routine is used by Tcl_(FS)SplitPath to handle splitting
 *    Macintosh paths.
 *
 * Results:
 *    Returns a newly allocated Tcl list object.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

static Tcl_Obj*
SplitMacPath(path)
    CONST char *path;         /* Pointer to string containing a path. */
{
    int isMac = 0;            /* 1 if is Mac-style, 0 if Unix-style path. */
    int length;
    CONST char *p, *elementStart;
    Tcl_Obj *result;
#ifdef MAC_UNDERSTANDS_UNIX_PATHS
    Tcl_RegExp re;
    int i;
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
#endif
    
    result = Tcl_NewObj();
    
#ifdef MAC_UNDERSTANDS_UNIX_PATHS
    /*
     * Initialize the path name parser for Macintosh path names.
     */

    FileNameInit();

    /*
     * Match the root portion of a Mac path name.
     */

    i = 0;              /* Needed only to prevent gcc warnings. */

    re = Tcl_GetRegExpFromObj(NULL, tsdPtr->macRootPatternPtr, REG_ADVANCED);

    if (Tcl_RegExpExec(NULL, re, path, path) == 1) {
      CONST char *start, *end;
      Tcl_Obj *nextElt;

      /*
       * Treat degenerate absolute paths like / and /../.. as
       * Mac relative file names for lack of anything else to do.
       */

      Tcl_RegExpRange(re, 2, &start, &end);
      if (start) {
          Tcl_Obj *elt = Tcl_NewStringObj(":", 1);
          Tcl_RegExpRange(re, 0, &start, &end);
          Tcl_AppendToObj(elt, path, end - start);
          Tcl_ListObjAppendElement(NULL, result, elt);
          return result;
      }

      Tcl_RegExpRange(re, 5, &start, &end);
      if (start) {
          /*
           * Unix-style tilde prefixed paths.
           */

          isMac = 0;
          i = 5;
      } else {
          Tcl_RegExpRange(re, 7, &start, &end);
          if (start) {
            /*
             * Mac-style tilde prefixed paths.
             */

            isMac = 1;
            i = 7;
          } else {
            Tcl_RegExpRange(re, 10, &start, &end);
            if (start) {
                /*
                 * Normal Unix style paths.
                 */

                isMac = 0;
                i = 10;
            } else {
                Tcl_RegExpRange(re, 12, &start, &end);
                if (start) {
                  /*
                   * Normal Mac style paths.
                   */

                  isMac = 1;
                  i = 12;
                }
            }
          }
      }
      Tcl_RegExpRange(re, i, &start, &end);
      length = end - start;

      /*
       * Append the element and terminate it with a : 
       */

      nextElt = Tcl_NewStringObj(start, length);
      Tcl_AppendToObj(nextElt, ":", 1);
      Tcl_ListObjAppendElement(NULL, result, nextElt);
      p = end;
    } else {
      isMac = (strchr(path, ':') != NULL);
      p = path;
    }
#else
    if ((path[0] != ':') && (path[0] == '~' || (strchr(path,':') != NULL))) {
      CONST char *end;
      Tcl_Obj *nextElt;

      isMac = 1;
      
      end = strchr(path,':');
      if (end == NULL) {
          length = strlen(path);
      } else {
          length = end - path;
      }

      /*
       * Append the element and terminate it with a :
       */

      nextElt = Tcl_NewStringObj(path, length);
      Tcl_AppendToObj(nextElt, ":", 1);
      Tcl_ListObjAppendElement(NULL, result, nextElt);
      p = path + length;
    } else {
      isMac = (strchr(path, ':') != NULL);
      isMac = 1;
      p = path;
    }
#endif
    
    if (isMac) {

      /*
       * p is pointing at the first colon in the path.  There
       * will always be one, since this is a Mac-style path.
       * (This is no longer true if MAC_UNDERSTANDS_UNIX_PATHS 
       * is false, so we must check whether 'p' points to the
       * end of the string.)
       */
      elementStart = p;
      if (*p == ':') {
          p++;
      }
      
      while ((p = strchr(p, ':')) != NULL) {
          length = p - elementStart;
          if (length == 1) {
            while (*p == ':') {
                Tcl_ListObjAppendElement(NULL, result,
                      Tcl_NewStringObj("::", 2));
                elementStart = p++;
            }
          } else {
            /*
             * If this is a simple component, drop the leading colon.
             */

            if ((elementStart[1] != '~')
                  && (strchr(elementStart+1, '/') == NULL)) {
                elementStart++;
                length--;
            }
            Tcl_ListObjAppendElement(NULL, result, 
                  Tcl_NewStringObj(elementStart, length));
            elementStart = p++;
          }
      }
      if (elementStart[0] != ':') {
          if (elementStart[0] != '\0') {
            Tcl_ListObjAppendElement(NULL, result, 
                  Tcl_NewStringObj(elementStart, -1));
          }
      } else {
          if (elementStart[1] != '\0' || elementStart == path) {
            if ((elementStart[1] != '~') && (elementStart[1] != '\0')
                  && (strchr(elementStart+1, '/') == NULL)) {
                elementStart++;
            }
            Tcl_ListObjAppendElement(NULL, result, 
                  Tcl_NewStringObj(elementStart, -1));
          }
      }
    } else {

      /*
       * Split on slashes, suppress extra /'s, and convert .. to ::. 
       */

      for (;;) {
          elementStart = p;
          while ((*p != '\0') && (*p != '/')) {
            p++;
          }
          length = p - elementStart;
          if (length > 0) {
            if ((length == 1) && (elementStart[0] == '.')) {
                Tcl_ListObjAppendElement(NULL, result, 
                                   Tcl_NewStringObj(":", 1));
            } else if ((length == 2) && (elementStart[0] == '.')
                  && (elementStart[1] == '.')) {
                Tcl_ListObjAppendElement(NULL, result, 
                                   Tcl_NewStringObj("::", 2));
            } else {
                Tcl_Obj *nextElt;
                if (*elementStart == '~') {
                  nextElt = Tcl_NewStringObj(":",1);
                  Tcl_AppendToObj(nextElt, elementStart, length);
                } else {
                  nextElt = Tcl_NewStringObj(elementStart, length);
                }
                Tcl_ListObjAppendElement(NULL, result, nextElt);
            }
          }
          if (*p++ == '\0') {
            break;
          }
      }
    }
    return result;
}

/*
 *---------------------------------------------------------------------------
 *
 * Tcl_FSJoinToPath --
 *
 *      This function takes the given object, which should usually be a
 *      valid path or NULL, and joins onto it the array of paths
 *      segments given.
 *
 * Results:
 *      Returns object with refCount of zero
 *
 * Side effects:
 *    None.
 *
 *---------------------------------------------------------------------------
 */

Tcl_Obj* 
Tcl_FSJoinToPath(basePtr, objc, objv)
    Tcl_Obj *basePtr;
    int objc;
    Tcl_Obj *CONST objv[];
{
    int i;
    Tcl_Obj *lobj, *ret;

    if (basePtr == NULL) {
      lobj = Tcl_NewListObj(0, NULL);
    } else {
      lobj = Tcl_NewListObj(1, &basePtr);
    }
    
    for (i = 0; i<objc;i++) {
      Tcl_ListObjAppendElement(NULL, lobj, objv[i]);
    }
    ret = Tcl_FSJoinPath(lobj, -1);
    Tcl_DecrRefCount(lobj);
    return ret;
}

/*
 *---------------------------------------------------------------------------
 *
 * TclpNativeJoinPath --
 *
 *      'prefix' is absolute, 'joining' is relative to prefix.
 *
 * Results:
 *      modifies prefix
 *
 * Side effects:
 *    None.
 *
 *---------------------------------------------------------------------------
 */

void
TclpNativeJoinPath(prefix, joining)
    Tcl_Obj *prefix;
    char* joining;
{
    int length, needsSep;
    char *dest, *p, *start;
    
    start = Tcl_GetStringFromObj(prefix, &length);

    /*
     * Remove the ./ from tilde prefixed elements, and drive-letter
     * prefixed elements on Windows, unless it is the first component.
     */
    
    p = joining;
    
    if (length != 0) {
      if ((p[0] == '.') && (p[1] == '/')
          && ((p[2] == '~')
            || ((tclPlatform == TCL_PLATFORM_WINDOWS)
                && isalpha(UCHAR(p[2]))
                && (p[3] == ':')))) {
          p += 2;
      }
    }
    if (*p == '\0') {
      return;
    }

    switch (tclPlatform) {
        case TCL_PLATFORM_UNIX:
          /*
           * Append a separator if needed.
           */

          if (length > 0 && (start[length-1] != '/')) {
            Tcl_AppendToObj(prefix, "/", 1);
            length++;
          }
          needsSep = 0;
          
          /*
           * Append the element, eliminating duplicate and trailing
           * slashes.
           */

          Tcl_SetObjLength(prefix, length + (int) strlen(p));
          
          dest = Tcl_GetString(prefix) + length;
          for (; *p != '\0'; p++) {
            if (*p == '/') {
                while (p[1] == '/') {
                  p++;
                }
                if (p[1] != '\0') {
                  if (needsSep) {
                      *dest++ = '/';
                  }
                }
            } else {
                *dest++ = *p;
                needsSep = 1;
            }
          }
          length = dest - Tcl_GetString(prefix);
          Tcl_SetObjLength(prefix, length);
          break;

      case TCL_PLATFORM_WINDOWS:
          /*
           * Check to see if we need to append a separator.
           */

          if ((length > 0) && 
            (start[length-1] != '/') && (start[length-1] != ':')) {
            Tcl_AppendToObj(prefix, "/", 1);
            length++;
          }
          needsSep = 0;
          
          /*
           * Append the element, eliminating duplicate and
           * trailing slashes.
           */

          Tcl_SetObjLength(prefix, length + (int) strlen(p));
          dest = Tcl_GetString(prefix) + length;
          for (; *p != '\0'; p++) {
            if ((*p == '/') || (*p == '\\')) {
                while ((p[1] == '/') || (p[1] == '\\')) {
                  p++;
                }
                if ((p[1] != '\0') && needsSep) {
                  *dest++ = '/';
                }
            } else {
                *dest++ = *p;
                needsSep = 1;
            }
          }
          length = dest - Tcl_GetString(prefix);
          Tcl_SetObjLength(prefix, length);
          break;

      case TCL_PLATFORM_MAC: {
          int newLength;
          
          /*
           * Sort out separators.  We basically add the object we've
           * been given, but we have to make sure that there is
           * exactly one separator inbetween (unless the object we're
           * adding contains multiple contiguous colons, all of which
           * we must add).  Also if an object is just ':' we don't
           * bother to add it unless it's the very first element.
           */

#ifdef MAC_UNDERSTANDS_UNIX_PATHS
          int adjustedPath = 0;
          if ((strchr(p, ':') == NULL) && (strchr(p, '/') != NULL)) {
            char *start = p;
            adjustedPath = 1;
            while (*start != '\0') {
                if (*start == '/') {
                    *start = ':';
                }
                start++;
            }
          }
#endif
          if (length > 0) {
            if ((p[0] == ':') && (p[1] == '\0')) {
                return;
            }
            if (start[length-1] != ':') {
                if (*p != '\0' && *p != ':') {
                  Tcl_AppendToObj(prefix, ":", 1);
                  length++;
                }
            } else if (*p == ':') {
                p++;
            }
          } else {
            if (*p != '\0' && *p != ':') {
                Tcl_AppendToObj(prefix, ":", 1);
                length++;
            }
          }
          
          /*
           * Append the element
           */

          newLength = strlen(p);
          /* 
           * It may not be good to just do 'Tcl_AppendToObj(prefix,
           * p, newLength)' because the object may contain duplicate
           * colons which we want to get rid of.
           */
          Tcl_AppendToObj(prefix, p, newLength);
          
          /* Remove spurious trailing single ':' */
          dest = Tcl_GetString(prefix) + length + newLength;
          if (*(dest-1) == ':') {
            if (dest-1 > Tcl_GetString(prefix)) {
                if (*(dest-2) != ':') {
                    Tcl_SetObjLength(prefix, length + newLength -1);
                }
            }
          }
#ifdef MAC_UNDERSTANDS_UNIX_PATHS
          /* Revert the path to what it was */
          if (adjustedPath) {
            char *start = joining;
            while (*start != '\0') {
                if (*start == ':') {
                  *start = '/';
                }
                start++;
            }
          }
#endif
          break;
      }
    }
    return;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_JoinPath --
 *
 *    Combine a list of paths in a platform specific manner.  The
 *    function 'Tcl_FSJoinPath' should be used in preference where
 *    possible.
 *
 * Results:
 *    Appends the joined path to the end of the specified 
 *    Tcl_DString returning a pointer to the resulting string.  Note
 *    that the Tcl_DString must already be initialized.
 *
 * Side effects:
 *    Modifies the Tcl_DString.
 *
 *----------------------------------------------------------------------
 */

char *
Tcl_JoinPath(argc, argv, resultPtr)
    int argc;
    CONST char * CONST *argv;
    Tcl_DString *resultPtr;   /* Pointer to previously initialized DString */
{
    int i, len;
    Tcl_Obj *listObj = Tcl_NewObj();
    Tcl_Obj *resultObj;
    char *resultStr;

    /* Build the list of paths */
    for (i = 0; i < argc; i++) {
        Tcl_ListObjAppendElement(NULL, listObj,
            Tcl_NewStringObj(argv[i], -1));
    }

    /* Ask the objectified code to join the paths */
    Tcl_IncrRefCount(listObj);
    resultObj = Tcl_FSJoinPath(listObj, argc);
    Tcl_IncrRefCount(resultObj);
    Tcl_DecrRefCount(listObj);

    /* Store the result */
    resultStr = Tcl_GetStringFromObj(resultObj, &len);
    Tcl_DStringAppend(resultPtr, resultStr, len);
    Tcl_DecrRefCount(resultObj);

    /* Return a pointer to the result */
    return Tcl_DStringValue(resultPtr);
}

/*
 *---------------------------------------------------------------------------
 *
 * Tcl_TranslateFileName --
 *
 *    Converts a file name into a form usable by the native system
 *    interfaces.  If the name starts with a tilde, it will produce a
 *    name where the tilde and following characters have been replaced
 *    by the home directory location for the named user.
 *
 * Results:
 *    The return value is a pointer to a string containing the name
 *    after tilde substitution.  If there was no tilde substitution,
 *    the return value is a pointer to a copy of the original string.
 *    If there was an error in processing the name, then an error
 *    message is left in the interp's result (if interp was not NULL)
 *    and the return value is NULL.  Space for the return value is
 *    allocated in bufferPtr; the caller must call Tcl_DStringFree()
 *    to free the space if the return value was not NULL.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

char *
Tcl_TranslateFileName(interp, name, bufferPtr)
    Tcl_Interp *interp;       /* Interpreter in which to store error
                         * message (if necessary). */
    CONST char *name;         /* File name, which may begin with "~" (to
                         * indicate current user's home directory) or
                         * "~<user>" (to indicate any user's home
                         * directory). */
    Tcl_DString *bufferPtr;   /* Uninitialized or free DString filled
                         * with name after tilde substitution. */
{
    Tcl_Obj *path = Tcl_NewStringObj(name, -1);
    Tcl_Obj *transPtr;

    Tcl_IncrRefCount(path);
    transPtr = Tcl_FSGetTranslatedPath(interp, path);
    if (transPtr == NULL) {
      Tcl_DecrRefCount(path);
      return NULL;
    }
    
    Tcl_DStringInit(bufferPtr);
    Tcl_DStringAppend(bufferPtr, Tcl_GetString(transPtr), -1);
    Tcl_DecrRefCount(path);
    Tcl_DecrRefCount(transPtr);
    
    /*
     * Convert forward slashes to backslashes in Windows paths because
     * some system interfaces don't accept forward slashes.
     */

    if (tclPlatform == TCL_PLATFORM_WINDOWS) {
      register char *p;
      for (p = Tcl_DStringValue(bufferPtr); *p != '\0'; p++) {
          if (*p == '/') {
            *p = '\\';
          }
      }
    }
    return Tcl_DStringValue(bufferPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * TclGetExtension --
 *
 *    This function returns a pointer to the beginning of the
 *    extension part of a file name.
 *
 * Results:
 *    Returns a pointer into name which indicates where the extension
 *    starts.  If there is no extension, returns NULL.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

char *
TclGetExtension(name)
    char *name;               /* File name to parse. */
{
    char *p, *lastSep;

    /*
     * First find the last directory separator.
     */

    lastSep = NULL;           /* Needed only to prevent gcc warnings. */
    switch (tclPlatform) {
      case TCL_PLATFORM_UNIX:
          lastSep = strrchr(name, '/');
          break;

      case TCL_PLATFORM_MAC:
#ifdef MAC_UNDERSTANDS_UNIX_PATHS
          if (strchr(name, ':') == NULL) {
            lastSep = strrchr(name, '/');
          } else {
            lastSep = strrchr(name, ':');
          }
#else
          lastSep = strrchr(name, ':');
#endif
          break;

      case TCL_PLATFORM_WINDOWS:
          lastSep = NULL;
          for (p = name; *p != '\0'; p++) {
            if (strchr("/\\:", *p) != NULL) {
                lastSep = p;
            }
          }
          break;
    }
    p = strrchr(name, '.');
    if ((p != NULL) && (lastSep != NULL) && (lastSep > p)) {
      p = NULL;
    }

    /*
     * In earlier versions, we used to back up to the first period in a series
     * so that "foo..o" would be split into "foo" and "..o".  This is a
     * confusing and usually incorrect behavior, so now we split at the last
     * period in the name.
     */

    return p;
}

/*
 *----------------------------------------------------------------------
 *
 * DoTildeSubst --
 *
 *    Given a string following a tilde, this routine returns the
 *    corresponding home directory.
 *
 * Results:
 *    The result is a pointer to a static string containing the home
 *    directory in native format.  If there was an error in processing
 *    the substitution, then an error message is left in the interp's
 *    result and the return value is NULL.  On success, the results
 *    are appended to resultPtr, and the contents of resultPtr are
 *    returned.
 *
 * Side effects:
 *    Information may be left in resultPtr.
 *
 *----------------------------------------------------------------------
 */

static CONST char *
DoTildeSubst(interp, user, resultPtr)
    Tcl_Interp *interp;       /* Interpreter in which to store error
                         * message (if necessary). */
    CONST char *user;         /* Name of user whose home directory should be
                         * substituted, or "" for current user. */
    Tcl_DString *resultPtr;   /* Initialized DString filled with name
                         * after tilde substitution. */
{
    CONST char *dir;

    if (*user == '\0') {
      Tcl_DString dirString;
      
      dir = TclGetEnv("HOME", &dirString);
      if (dir == NULL) {
          if (interp) {
            Tcl_ResetResult(interp);
            Tcl_AppendResult(interp, "couldn't find HOME environment ",
                  "variable to expand path", (char *) NULL);
          }
          return NULL;
      }
      Tcl_JoinPath(1, &dir, resultPtr);
      Tcl_DStringFree(&dirString);
    } else {
      if (TclpGetUserHome(user, resultPtr) == NULL) { 
          if (interp) {
            Tcl_ResetResult(interp);
            Tcl_AppendResult(interp, "user \"", user, "\" doesn't exist",
                  (char *) NULL);
          }
          return NULL;
      }
    }
    return Tcl_DStringValue(resultPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_GlobObjCmd --
 *
 *    This procedure is invoked to process the "glob" Tcl command.
 *    See the user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

      /* ARGSUSED */
int
Tcl_GlobObjCmd(dummy, interp, objc, objv)
    ClientData dummy;               /* Not used. */
    Tcl_Interp *interp;             /* Current interpreter. */
    int objc;                       /* Number of arguments. */
    Tcl_Obj *CONST objv[];          /* Argument objects. */
{
    int index, i, globFlags, length, join, dir, result;
    char *string, *separators;
    Tcl_Obj *typePtr, *resultPtr, *look;
    Tcl_Obj *pathOrDir = NULL;
    Tcl_DString prefix;
    static CONST char *options[] = {
      "-directory", "-join", "-nocomplain", "-path", "-tails", 
      "-types", "--", NULL
    };
    enum options {
      GLOB_DIR, GLOB_JOIN, GLOB_NOCOMPLAIN, GLOB_PATH, GLOB_TAILS, 
      GLOB_TYPE, GLOB_LAST
    };
    enum pathDirOptions {PATH_NONE = -1 , PATH_GENERAL = 0, PATH_DIR = 1};
    Tcl_GlobTypeData *globTypes = NULL;

    globFlags = 0;
    join = 0;
    dir = PATH_NONE;
    typePtr = NULL;
    for (i = 1; i < objc; i++) {
      if (Tcl_GetIndexFromObj(interp, objv[i], options, "option", 0, &index)
            != TCL_OK) {
          string = Tcl_GetStringFromObj(objv[i], &length);
          if (string[0] == '-') {
            /*
             * It looks like the command contains an option so signal
             * an error
             */
            return TCL_ERROR;
          } else {
            /*
             * This clearly isn't an option; assume it's the first
             * glob pattern.  We must clear the error
             */
            Tcl_ResetResult(interp);
            break;
          }
      }
      switch (index) {
          case GLOB_NOCOMPLAIN:                 /* -nocomplain */
              globFlags |= TCL_GLOBMODE_NO_COMPLAIN;
            break;
          case GLOB_DIR:                        /* -dir */
            if (i == (objc-1)) {
                Tcl_SetObjResult(interp, Tcl_NewStringObj(
                      "missing argument to \"-directory\"", -1));
                return TCL_ERROR;
            }
            if (dir != PATH_NONE) {
                Tcl_SetObjResult(interp, Tcl_NewStringObj(
                      "\"-directory\" cannot be used with \"-path\"",
                      -1));
                return TCL_ERROR;
            }
            dir = PATH_DIR;
            globFlags |= TCL_GLOBMODE_DIR;
            pathOrDir = objv[i+1];
            i++;
            break;
          case GLOB_JOIN:                       /* -join */
            join = 1;
            break;
          case GLOB_TAILS:                      /* -tails */
              globFlags |= TCL_GLOBMODE_TAILS;
            break;
          case GLOB_PATH:                       /* -path */
              if (i == (objc-1)) {
                Tcl_SetObjResult(interp, Tcl_NewStringObj(
                      "missing argument to \"-path\"", -1));
                return TCL_ERROR;
            }
            if (dir != PATH_NONE) {
                Tcl_SetObjResult(interp, Tcl_NewStringObj(
                      "\"-path\" cannot be used with \"-directory\"",
                      -1));
                return TCL_ERROR;
            }
            dir = PATH_GENERAL;
            pathOrDir = objv[i+1];
            i++;
            break;
          case GLOB_TYPE:                       /* -types */
              if (i == (objc-1)) {
                Tcl_SetObjResult(interp, Tcl_NewStringObj(
                      "missing argument to \"-types\"", -1));
                return TCL_ERROR;
            }
            typePtr = objv[i+1];
            if (Tcl_ListObjLength(interp, typePtr, &length) != TCL_OK) {
                return TCL_ERROR;
            }
            i++;
            break;
          case GLOB_LAST:                       /* -- */
              i++;
            goto endOfForLoop;
      }
    }
    endOfForLoop:
    if (objc - i < 1) {
        Tcl_WrongNumArgs(interp, 1, objv, "?switches? name ?name ...?");
      return TCL_ERROR;
    }
    if ((globFlags & TCL_GLOBMODE_TAILS) && (pathOrDir == NULL)) {
      Tcl_SetObjResult(interp, Tcl_NewStringObj(
        "\"-tails\" must be used with either \"-directory\" or \"-path\"",
        -1));
      return TCL_ERROR;
    }
    
    separators = NULL;        /* lint. */
    switch (tclPlatform) {
      case TCL_PLATFORM_UNIX:
          separators = "/";
          break;
      case TCL_PLATFORM_WINDOWS:
          separators = "/\\:";
          break;
      case TCL_PLATFORM_MAC:
          separators = ":";
          break;
    }
    if (dir == PATH_GENERAL) {
      int pathlength;
      char *last;
      char *first = Tcl_GetStringFromObj(pathOrDir,&pathlength);

      /*
       * Find the last path separator in the path
       */
      last = first + pathlength;
      for (; last != first; last--) {
          if (strchr(separators, *(last-1)) != NULL) {
            break;
          }
      }
      if (last == first + pathlength) {
          /* It's really a directory */
          dir = PATH_DIR;
      } else {
          Tcl_DString pref;
          char *search, *find;
          Tcl_DStringInit(&pref);
          if (last == first) {
            /* The whole thing is a prefix */
            Tcl_DStringAppend(&pref, first, -1);
            pathOrDir = NULL;
          } else {
            /* Have to split off the end */
            Tcl_DStringAppend(&pref, last, first+pathlength-last);
            pathOrDir = Tcl_NewStringObj(first, last-first-1);
            /* 
             * We must ensure that we haven't cut off too much,
             * and turned a valid path like '/' or 'C:/' into
             * an incorrect path like '' or 'C:'.  The way we
             * do this is to add a separator if there are none
             * presently in the prefix.
             */
            if (strpbrk(Tcl_GetString(pathOrDir), "\\/") == NULL) {
                Tcl_AppendToObj(pathOrDir, last-1, 1); 
            }
          }
          /* Need to quote 'prefix' */
          Tcl_DStringInit(&prefix);
          search = Tcl_DStringValue(&pref);
          while ((find = (strpbrk(search, "\\[]*?{}"))) != NULL) {
              Tcl_DStringAppend(&prefix, search, find-search);
              Tcl_DStringAppend(&prefix, "\\", 1);
              Tcl_DStringAppend(&prefix, find, 1);
              search = find+1;
              if (*search == '\0') {
                  break;
              }
          }
          if (*search != '\0') {
            Tcl_DStringAppend(&prefix, search, -1);
          }
          Tcl_DStringFree(&pref);
      }
    }
    
    if (pathOrDir != NULL) {
      Tcl_IncrRefCount(pathOrDir);
    }
    
    if (typePtr != NULL) {
      /* 
       * The rest of the possible type arguments (except 'd') are
       * platform specific.  We don't complain when they are used
       * on an incompatible platform.
       */
      Tcl_ListObjLength(interp, typePtr, &length);
      globTypes = (Tcl_GlobTypeData*) ckalloc(sizeof(Tcl_GlobTypeData));
      globTypes->type = 0;
      globTypes->perm = 0;
      globTypes->macType = NULL;
      globTypes->macCreator = NULL;
      while(--length >= 0) {
          int len;
          char *str;
          Tcl_ListObjIndex(interp, typePtr, length, &look);
          str = Tcl_GetStringFromObj(look, &len);
          if (strcmp("readonly", str) == 0) {
            globTypes->perm |= TCL_GLOB_PERM_RONLY;
          } else if (strcmp("hidden", str) == 0) {
            globTypes->perm |= TCL_GLOB_PERM_HIDDEN;
          } else if (len == 1) {
            switch (str[0]) {
              case 'r':
                globTypes->perm |= TCL_GLOB_PERM_R;
                break;
              case 'w':
                globTypes->perm |= TCL_GLOB_PERM_W;
                break;
              case 'x':
                globTypes->perm |= TCL_GLOB_PERM_X;
                break;
              case 'b':
                globTypes->type |= TCL_GLOB_TYPE_BLOCK;
                break;
              case 'c':
                globTypes->type |= TCL_GLOB_TYPE_CHAR;
                break;
              case 'd':
                globTypes->type |= TCL_GLOB_TYPE_DIR;
                break;
              case 'p':
                globTypes->type |= TCL_GLOB_TYPE_PIPE;
                break;
              case 'f':
                globTypes->type |= TCL_GLOB_TYPE_FILE;
                break;
                case 'l':
                globTypes->type |= TCL_GLOB_TYPE_LINK;
                break;
              case 's':
                globTypes->type |= TCL_GLOB_TYPE_SOCK;
                break;
              default:
                goto badTypesArg;
            }
          } else if (len == 4) {
            /* This is assumed to be a MacOS file type */
            if (globTypes->macType != NULL) {
                goto badMacTypesArg;
            }
            globTypes->macType = look;
            Tcl_IncrRefCount(look);
          } else {
            Tcl_Obj* item;
            if ((Tcl_ListObjLength(NULL, look, &len) == TCL_OK) &&
                  (len == 3)) {
                Tcl_ListObjIndex(interp, look, 0, &item);
                if (!strcmp("macintosh", Tcl_GetString(item))) {
                  Tcl_ListObjIndex(interp, look, 1, &item);
                  if (!strcmp("type", Tcl_GetString(item))) {
                      Tcl_ListObjIndex(interp, look, 2, &item);
                      if (globTypes->macType != NULL) {
                        goto badMacTypesArg;
                      }
                      globTypes->macType = item;
                      Tcl_IncrRefCount(item);
                      continue;
                  } else if (!strcmp("creator", Tcl_GetString(item))) {
                      Tcl_ListObjIndex(interp, look, 2, &item);
                      if (globTypes->macCreator != NULL) {
                        goto badMacTypesArg;
                      }
                      globTypes->macCreator = item;
                      Tcl_IncrRefCount(item);
                      continue;
                  }
                }
            }
            /*
             * Error cases.  We reset
             * the 'join' flag to zero, since we haven't yet
             * made use of it.
             */
            badTypesArg:
            resultPtr = Tcl_GetObjResult(interp);
            Tcl_AppendToObj(resultPtr, "bad argument to \"-types\": ", -1);
            Tcl_AppendObjToObj(resultPtr, look);
            result = TCL_ERROR;
            join = 0;
            goto endOfGlob;
            badMacTypesArg:
            Tcl_SetObjResult(interp, Tcl_NewStringObj(
               "only one MacOS type or creator argument"
               " to \"-types\" allowed", -1));
            result = TCL_ERROR;
            join = 0;
            goto endOfGlob;
          }
      }
    }

    /* 
     * Now we perform the actual glob below.  This may involve joining
     * together the pattern arguments, dealing with particular file types
     * etc.  We use a 'goto' to ensure we free any memory allocated along
     * the way.
     */
    objc -= i;
    objv += i;
    result = TCL_OK;
    if (join) {
      if (dir != PATH_GENERAL) {
          Tcl_DStringInit(&prefix);
      }
      for (i = 0; i < objc; i++) {
          string = Tcl_GetStringFromObj(objv[i], &length);
          Tcl_DStringAppend(&prefix, string, length);
          if (i != objc -1) {
            Tcl_DStringAppend(&prefix, separators, 1);
          }
      }
      if (TclGlob(interp, Tcl_DStringValue(&prefix), pathOrDir,
            globFlags, globTypes) != TCL_OK) {
          result = TCL_ERROR;
          goto endOfGlob;
      }
    } else {
      if (dir == PATH_GENERAL) {
          Tcl_DString str;
          for (i = 0; i < objc; i++) {
            Tcl_DStringInit(&str);
            if (dir == PATH_GENERAL) {
                Tcl_DStringAppend(&str, Tcl_DStringValue(&prefix),
                      Tcl_DStringLength(&prefix));
            }
            string = Tcl_GetStringFromObj(objv[i], &length);
            Tcl_DStringAppend(&str, string, length);
            if (TclGlob(interp, Tcl_DStringValue(&str), pathOrDir,
                  globFlags, globTypes) != TCL_OK) {
                result = TCL_ERROR;
                Tcl_DStringFree(&str);
                goto endOfGlob;
            }
          }
          Tcl_DStringFree(&str);
      } else {
          for (i = 0; i < objc; i++) {
            string = Tcl_GetString(objv[i]);
            if (TclGlob(interp, string, pathOrDir,
                  globFlags, globTypes) != TCL_OK) {
                result = TCL_ERROR;
                goto endOfGlob;
            }
          }
      }
    }
    if ((globFlags & TCL_GLOBMODE_NO_COMPLAIN) == 0) {
      if (Tcl_ListObjLength(interp, Tcl_GetObjResult(interp),
            &length) != TCL_OK) {
          /* This should never happen.  Maybe we should be more dramatic */
          result = TCL_ERROR;
          goto endOfGlob;
      }
      if (length == 0) {
          Tcl_AppendResult(interp, "no files matched glob pattern",
                (join || (objc == 1)) ? " \"" : "s \"", (char *) NULL);
          if (join) {
            Tcl_AppendResult(interp, Tcl_DStringValue(&prefix),
                  (char *) NULL);
          } else {
            char *sep = "";
            for (i = 0; i < objc; i++) {
                string = Tcl_GetString(objv[i]);
                Tcl_AppendResult(interp, sep, string, (char *) NULL);
                sep = " ";
            }
          }
          Tcl_AppendResult(interp, "\"", (char *) NULL);
          result = TCL_ERROR;
      }
    }
  endOfGlob:
    if (join || (dir == PATH_GENERAL)) {
      Tcl_DStringFree(&prefix);
    }
    if (pathOrDir != NULL) {
      Tcl_DecrRefCount(pathOrDir);
    }
    if (globTypes != NULL) {
      if (globTypes->macType != NULL) {
          Tcl_DecrRefCount(globTypes->macType);
      }
      if (globTypes->macCreator != NULL) {
          Tcl_DecrRefCount(globTypes->macCreator);
      }
      ckfree((char *) globTypes);
    }
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * TclGlob --
 *
 *    This procedure prepares arguments for the TclDoGlob call.
 *    It sets the separator string based on the platform, performs
 *      tilde substitution, and calls TclDoGlob.
 *      
 *      The interpreter's result, on entry to this function, must
 *      be a valid Tcl list (e.g. it could be empty), since we will
 *      lappend any new results to that list.  If it is not a valid
 *      list, this function will fail to do anything very meaningful.
 *
 * Results:
 *    The return value is a standard Tcl result indicating whether
 *    an error occurred in globbing.  After a normal return the
 *    result in interp (set by TclDoGlob) holds all of the file names
 *    given by the pattern and unquotedPrefix arguments.  After an 
 *    error the result in interp will hold an error message, unless
 *    the 'TCL_GLOBMODE_NO_COMPLAIN' flag was given, in which case
 *    an error results in a TCL_OK return leaving the interpreter's
 *    result unmodified.
 *
 * Side effects:
 *    The 'pattern' is written to.
 *
 *----------------------------------------------------------------------
 */

      /* ARGSUSED */
int
TclGlob(interp, pattern, unquotedPrefix, globFlags, types)
    Tcl_Interp *interp;       /* Interpreter for returning error message
                         * or appending list of matching file names. */
    char *pattern;            /* Glob pattern to match. Must not refer
                         * to a static string. */
    Tcl_Obj *unquotedPrefix;  /* Prefix to glob pattern, if non-null, which
                               * is considered literally. */
    int globFlags;            /* Stores or'ed combination of flags */
    Tcl_GlobTypeData *types;  /* Struct containing acceptable types.
                         * May be NULL. */
{
    char *separators;
    CONST char *head;
    char *tail, *start;
    char c;
    int result, prefixLen;
    Tcl_DString buffer;
    Tcl_Obj *oldResult;

    separators = NULL;        /* lint. */
    switch (tclPlatform) {
      case TCL_PLATFORM_UNIX:
          separators = "/";
          break;
      case TCL_PLATFORM_WINDOWS:
          separators = "/\\:";
          break;
      case TCL_PLATFORM_MAC:
#ifdef MAC_UNDERSTANDS_UNIX_PATHS
          if (unquotedPrefix == NULL) {
            separators = (strchr(pattern, ':') == NULL) ? "/" : ":";
          } else {
            separators = ":";
          }
#else
          separators = ":";
#endif
          break;
    }

    Tcl_DStringInit(&buffer);
    if (unquotedPrefix != NULL) {
      start = Tcl_GetString(unquotedPrefix);
    } else {
      start = pattern;
    }

    /*
     * Perform tilde substitution, if needed.
     */

    if (start[0] == '~') {
      
      /*
       * Find the first path separator after the tilde.
       */
      for (tail = start; *tail != '\0'; tail++) {
          if (*tail == '\\') {
            if (strchr(separators, tail[1]) != NULL) {
                break;
            }
          } else if (strchr(separators, *tail) != NULL) {
            break;
          }
      }

      /*
       * Determine the home directory for the specified user.  
       */
      
      c = *tail;
      *tail = '\0';
      if (globFlags & TCL_GLOBMODE_NO_COMPLAIN) {
          /* 
           * We will ignore any error message here, and we
           * don't want to mess up the interpreter's result.
           */
          head = DoTildeSubst(NULL, start+1, &buffer);
      } else {
          head = DoTildeSubst(interp, start+1, &buffer);
      }
      *tail = c;
      if (head == NULL) {
          if (globFlags & TCL_GLOBMODE_NO_COMPLAIN) {
            return TCL_OK;
          } else {
            return TCL_ERROR;
          }
      }
      if (head != Tcl_DStringValue(&buffer)) {
          Tcl_DStringAppend(&buffer, head, -1);
      }
      if (unquotedPrefix != NULL) {
          Tcl_DStringAppend(&buffer, tail, -1);
          tail = pattern;
      }
    } else {
      tail = pattern;
      if (unquotedPrefix != NULL) {
          Tcl_DStringAppend(&buffer,Tcl_GetString(unquotedPrefix),-1);
      }
    }
    
    /* 
     * We want to remember the length of the current prefix,
     * in case we are using TCL_GLOBMODE_TAILS.  Also if we
     * are using TCL_GLOBMODE_DIR, we must make sure the
     * prefix ends in a directory separator.
     */
    prefixLen = Tcl_DStringLength(&buffer);

    if (prefixLen > 0) {
      c = Tcl_DStringValue(&buffer)[prefixLen-1];
      if (strchr(separators, c) == NULL) {
          /* 
           * If the prefix is a directory, make sure it ends in a
           * directory separator.
           */
          if (globFlags & TCL_GLOBMODE_DIR) {
            Tcl_DStringAppend(&buffer,separators,1);
          }
          prefixLen++;
      }
    }

    /* 
     * We need to get the old result, in case it is over-written
     * below when we still need it.
     */
    oldResult = Tcl_GetObjResult(interp);
    Tcl_IncrRefCount(oldResult);
    Tcl_ResetResult(interp);
    
    result = TclDoGlob(interp, separators, &buffer, tail, types);
    
    if (result != TCL_OK) {
      if (globFlags & TCL_GLOBMODE_NO_COMPLAIN) {
          /* Put back the old result and reset the return code */
          Tcl_SetObjResult(interp, oldResult);
          result = TCL_OK;
      }
    } else {
      /* 
       * Now we must concatenate the 'oldResult' and the current
       * result, and then place that into the interpreter.
       * 
       * If we only want the tails, we must strip off the prefix now.
       * It may seem more efficient to pass the tails flag down into
       * TclDoGlob, Tcl_FSMatchInDirectory, but those functions are
       * continually adjusting the prefix as the various pieces of
       * the pattern are assimilated, so that would add a lot of
       * complexity to the code.  This way is a little slower (when
       * the -tails flag is given), but much simpler to code.
       */
      int objc, i;
      Tcl_Obj **objv;

      /* Ensure sole ownership */
      if (Tcl_IsShared(oldResult)) {
          Tcl_DecrRefCount(oldResult);
          oldResult = Tcl_DuplicateObj(oldResult);
          Tcl_IncrRefCount(oldResult);
      }

      Tcl_ListObjGetElements(NULL, Tcl_GetObjResult(interp), 
                         &objc, &objv);
#ifdef MAC_TCL
      /* adjust prefixLen if TclDoGlob prepended a ':' */
      if ((prefixLen > 0) && (objc > 0)
      && (Tcl_DStringValue(&buffer)[0] != ':')) {
          char *str = Tcl_GetStringFromObj(objv[0],NULL);
          if (str[0] == ':') {
                prefixLen++;
          }
      }
#endif
      for (i = 0; i< objc; i++) {
          Tcl_Obj* elt;
          if (globFlags & TCL_GLOBMODE_TAILS) {
            int len;
            char *oldStr = Tcl_GetStringFromObj(objv[i],&len);
            if (len == prefixLen) {
                if ((pattern[0] == '\0')
                  || (strchr(separators, pattern[0]) == NULL)) {
                  elt = Tcl_NewStringObj(".",1);
                } else {
                  elt = Tcl_NewStringObj("/",1);
                }
            } else {
                elt = Tcl_NewStringObj(oldStr + prefixLen, 
                                    len - prefixLen);
            }
          } else {
            elt = objv[i];
          }
          /* Assumption that 'oldResult' is a valid list */
          Tcl_ListObjAppendElement(interp, oldResult, elt);
      }
      Tcl_SetObjResult(interp, oldResult);
    }
    /* 
     * Release our temporary copy.  All code paths above must
     * end here so we free our reference.
     */
    Tcl_DecrRefCount(oldResult);
    Tcl_DStringFree(&buffer);
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * SkipToChar --
 *
 *    This function traverses a glob pattern looking for the next
 *    unquoted occurance of the specified character at the same braces
 *    nesting level.
 *
 * Results:
 *    Updates stringPtr to point to the matching character, or to
 *    the end of the string if nothing matched.  The return value
 *    is 1 if a match was found at the top level, otherwise it is 0.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

static int
SkipToChar(stringPtr, match)
    char **stringPtr;               /* Pointer string to check. */
    char *match;              /* Pointer to character to find. */
{
    int quoted, level;
    register char *p;

    quoted = 0;
    level = 0;

    for (p = *stringPtr; *p != '\0'; p++) {
      if (quoted) {
          quoted = 0;
          continue;
      }
      if ((level == 0) && (*p == *match)) {
          *stringPtr = p;
          return 1;
      }
      if (*p == '{') {
          level++;
      } else if (*p == '}') {
          level--;
      } else if (*p == '\\') {
          quoted = 1;
      }
    }
    *stringPtr = p;
    return 0;
}

/*
 *----------------------------------------------------------------------
 *
 * TclDoGlob --
 *
 *    This recursive procedure forms the heart of the globbing
 *    code.  It performs a depth-first traversal of the tree
 *    given by the path name to be globbed.  The directory and
 *    remainder are assumed to be native format paths.  The prefix 
 *    contained in 'headPtr' is not used as a glob pattern, simply
 *    as a path specifier, so it can contain unquoted glob-sensitive
 *    characters (if the directories to which it points contain
 *    such strange characters).
 *
 * Results:
 *    The return value is a standard Tcl result indicating whether
 *    an error occurred in globbing.  After a normal return the
 *    result in interp will be set to hold all of the file names
 *    given by the dir and rem arguments.  After an error the
 *    result in interp will hold an error message.
 *
 * Side effects:
 *    None.
 *
 *----------------------------------------------------------------------
 */

int
TclDoGlob(interp, separators, headPtr, tail, types)
    Tcl_Interp *interp;       /* Interpreter to use for error reporting
                         * (e.g. unmatched brace). */
    char *separators;         /* String containing separator characters
                         * that should be used to identify globbing
                         * boundaries. */
    Tcl_DString *headPtr;     /* Completely expanded prefix. */
    char *tail;               /* The unexpanded remainder of the path.
                         * Must not be a pointer to a static string. */
    Tcl_GlobTypeData *types;  /* List object containing list of acceptable 
                               * types. May be NULL. */
{
    int baseLength, quoted, count;
    int result = TCL_OK;
    char *name, *p, *openBrace, *closeBrace, *firstSpecialChar, savedChar;
    char lastChar = 0;
    
    int length = Tcl_DStringLength(headPtr);

    if (length > 0) {
      lastChar = Tcl_DStringValue(headPtr)[length-1];
    }

    /*
     * Consume any leading directory separators, leaving tail pointing
     * just past the last initial separator.
     */

    count = 0;
    name = tail;
    for (; *tail != '\0'; tail++) {
      if (*tail == '\\') {
          /* 
           * If the first character is escaped, either we have a directory
           * separator, or we have any other character.  In the latter case
           * the rest of tail is a pattern, and we must break from the loop.
           * This is particularly important on Windows where '\' is both
           * the escaping character and a directory separator.
           */
          if (strchr(separators, tail[1]) != NULL) {
            tail++;
          } else {
            break;
          }
      } else if (strchr(separators, *tail) == NULL) {
          break;
      }
      count++;
    }

    /*
     * Deal with path separators.  On the Mac, we have to watch out
     * for multiple separators, since they are special in Mac-style
     * paths.
     */

    switch (tclPlatform) {
      case TCL_PLATFORM_MAC:
#ifdef MAC_UNDERSTANDS_UNIX_PATHS
          if (*separators == '/') {
            if (((length == 0) && (count == 0))
                  || ((length > 0) && (lastChar != ':'))) {
                Tcl_DStringAppend(headPtr, ":", 1);
            }
          } else {
#endif
            if (count == 0) {
                if ((length > 0) && (lastChar != ':')) {
                  Tcl_DStringAppend(headPtr, ":", 1);
                }
            } else {
                if (lastChar == ':') {
                  count--;
                }
                while (count-- > 0) {
                  Tcl_DStringAppend(headPtr, ":", 1);
                }
            }
#ifdef MAC_UNDERSTANDS_UNIX_PATHS
          }
#endif
          break;
      case TCL_PLATFORM_WINDOWS:
          /*
           * If this is a drive relative path, add the colon and the
           * trailing slash if needed.  Otherwise add the slash if
           * this is the first absolute element, or a later relative
           * element.  Add an extra slash if this is a UNC path.
           */

          if (*name == ':') {
            Tcl_DStringAppend(headPtr, ":", 1);
            if (count > 1) {
                Tcl_DStringAppend(headPtr, "/", 1);
            }
          } else if ((*tail != '\0')
                && (((length > 0)
                      && (strchr(separators, lastChar) == NULL))
                      || ((length == 0) && (count > 0)))) {
            Tcl_DStringAppend(headPtr, "/", 1);
            if ((length == 0) && (count > 1)) {
                Tcl_DStringAppend(headPtr, "/", 1);
            }
          }
          
          break;
      case TCL_PLATFORM_UNIX:
          /*
           * Add a separator if this is the first absolute element, or
           * a later relative element.
           */

          if ((*tail != '\0')
                && (((length > 0)
                      && (strchr(separators, lastChar) == NULL))
                      || ((length == 0) && (count > 0)))) {
            Tcl_DStringAppend(headPtr, "/", 1);
          }
          break;
    }

    /*
     * Look for the first matching pair of braces or the first
     * directory separator that is not inside a pair of braces.
     */

    openBrace = closeBrace = NULL;
    quoted = 0;
    for (p = tail; *p != '\0'; p++) {
      if (quoted) {
          quoted = 0;
      } else if (*p == '\\') {
          quoted = 1;
          if (strchr(separators, p[1]) != NULL) {
            break;                  /* Quoted directory separator. */
          }
      } else if (strchr(separators, *p) != NULL) {
          break;              /* Unquoted directory separator. */
      } else if (*p == '{') {
          openBrace = p;
          p++;
          if (SkipToChar(&p, "}")) {
            closeBrace = p;         /* Balanced braces. */
            break;
          }
          Tcl_SetResult(interp, "unmatched open-brace in file name",
                TCL_STATIC);
          return TCL_ERROR;
      } else if (*p == '}') {
          Tcl_SetResult(interp, "unmatched close-brace in file name",
                TCL_STATIC);
          return TCL_ERROR;
      }
    }

    /*
     * Substitute the alternate patterns from the braces and recurse.
     */

    if (openBrace != NULL) {
      char *element;
      Tcl_DString newName;
      Tcl_DStringInit(&newName);

      /*
       * For each element within in the outermost pair of braces,
       * append the element and the remainder to the fixed portion
       * before the first brace and recursively call TclDoGlob.
       */

      Tcl_DStringAppend(&newName, tail, openBrace-tail);
      baseLength = Tcl_DStringLength(&newName);
      length = Tcl_DStringLength(headPtr);
      *closeBrace = '\0';
      for (p = openBrace; p != closeBrace; ) {
          p++;
          element = p;
          SkipToChar(&p, ",");
          Tcl_DStringSetLength(headPtr, length);
          Tcl_DStringSetLength(&newName, baseLength);
          Tcl_DStringAppend(&newName, element, p-element);
          Tcl_DStringAppend(&newName, closeBrace+1, -1);
          result = TclDoGlob(interp, separators, headPtr, 
                         Tcl_DStringValue(&newName), types);
          if (result != TCL_OK) {
            break;
          }
      }
      *closeBrace = '}';
      Tcl_DStringFree(&newName);
      return result;
    }

    /*
     * At this point, there are no more brace substitutions to perform on
     * this path component.  The variable p is pointing at a quoted or
     * unquoted directory separator or the end of the string.  So we need
     * to check for special globbing characters in the current pattern.
     * We avoid modifying tail if p is pointing at the end of the string.
     */

    if (*p != '\0') {

      /*
       * Note that we are modifying the string in place.  This won't work
       * if the string is a static.
       */

      savedChar = *p;
      *p = '\0';
      firstSpecialChar = strpbrk(tail, "*[]?\\");
      *p = savedChar;
    } else {
      firstSpecialChar = strpbrk(tail, "*[]?\\");
    }

    if (firstSpecialChar != NULL) {
      int ret;
      Tcl_Obj *head = Tcl_NewStringObj(Tcl_DStringValue(headPtr),-1);
      Tcl_IncrRefCount(head);
      /*
       * Look for matching files in the given directory.  The
       * implementation of this function is platform specific.  For
       * each file that matches, it will add the match onto the
       * resultPtr given.
       */
      if (*p == '\0') {
          ret = Tcl_FSMatchInDirectory(interp, Tcl_GetObjResult(interp), 
                               head, tail, types);
      } else {
          Tcl_Obj* resultPtr;

          /* 
           * We do the recursion ourselves.  This makes implementing
           * Tcl_FSMatchInDirectory for each filesystem much easier.
           */
          Tcl_GlobTypeData dirOnly = { TCL_GLOB_TYPE_DIR, 0, NULL, NULL };
          char save = *p;
          
          *p = '\0';
          resultPtr = Tcl_NewListObj(0, NULL);
          ret = Tcl_FSMatchInDirectory(interp, resultPtr, 
                               head, tail, &dirOnly);
          *p = save;
          if (ret == TCL_OK) {
            int resLength;
            ret = Tcl_ListObjLength(interp, resultPtr, &resLength);
            if (ret == TCL_OK) {
                int i;
                for (i =0; i< resLength; i++) {
                  Tcl_Obj *elt;
                  Tcl_DString ds;
                  Tcl_ListObjIndex(interp, resultPtr, i, &elt);
                  Tcl_DStringInit(&ds);
                  Tcl_DStringAppend(&ds, Tcl_GetString(elt), -1);
                  if(tclPlatform == TCL_PLATFORM_MAC) {
                      Tcl_DStringAppend(&ds, ":",1);
                  } else {                
                      Tcl_DStringAppend(&ds, "/",1);
                  }
                  ret = TclDoGlob(interp, separators, &ds, p+1, types);
                  Tcl_DStringFree(&ds);
                  if (ret != TCL_OK) {
                      break;
                  }
                }
            }
          }
          Tcl_DecrRefCount(resultPtr);
      }
      Tcl_DecrRefCount(head);
      return ret;
    }
    Tcl_DStringAppend(headPtr, tail, p-tail);
    if (*p != '\0') {
      return TclDoGlob(interp, separators, headPtr, p, types);
    } else {
      /*
       * This is the code path reached by a command like 'glob foo'.
       *
       * There are no more wildcards in the pattern and no more
       * unprocessed characters in the tail, so now we can construct
       * the path, and pass it to Tcl_FSMatchInDirectory with an
       * empty pattern to verify the existence of the file and check
       * it is of the correct type (if a 'types' flag it given -- if
       * no such flag was given, we could just use 'Tcl_FSLStat', but
       * for simplicity we keep to a common approach).
       */

      Tcl_Obj *nameObj;

      switch (tclPlatform) {
          case TCL_PLATFORM_MAC: {
            if (strchr(Tcl_DStringValue(headPtr), ':') == NULL) {
                Tcl_DStringAppend(headPtr, ":", 1);
            }
            break;
          }
          case TCL_PLATFORM_WINDOWS: {
            if (Tcl_DStringLength(headPtr) == 0) {
                if (((*name == '\\') && (name[1] == '/' || name[1] == '\\'))
                      || (*name == '/')) {
                  Tcl_DStringAppend(headPtr, "/", 1);
                } else {
                  Tcl_DStringAppend(headPtr, ".", 1);
                }
            }
#if defined(__CYGWIN__) && defined(__WIN32__)
            {
            extern int cygwin_conv_to_win32_path 
                _ANSI_ARGS_((CONST char *, char *));
            char winbuf[MAX_PATH+1];

            cygwin_conv_to_win32_path(Tcl_DStringValue(headPtr), winbuf);
            Tcl_DStringFree(headPtr);
            Tcl_DStringAppend(headPtr, winbuf, -1);
            }
#endif /* __CYGWIN__ && __WIN32__ */
            /* 
             * Convert to forward slashes.  This is required to pass
             * some Tcl tests.  We should probably remove the conversions
             * here and in tclWinFile.c, since they aren't needed since
             * the dropping of support for Win32s.
             */
            for (p = Tcl_DStringValue(headPtr); *p != '\0'; p++) {
                if (*p == '\\') {
                  *p = '/';
                }
            }
            break;
          }
          case TCL_PLATFORM_UNIX: {
            if (Tcl_DStringLength(headPtr) == 0) {
                if ((*name == '\\' && name[1] == '/') || (*name == '/')) {
                  Tcl_DStringAppend(headPtr, "/", 1);
                } else {
                  Tcl_DStringAppend(headPtr, ".", 1);
                }
            }
            break;
          }
      }
      /* Common for all platforms */
      name = Tcl_DStringValue(headPtr);
      nameObj = Tcl_NewStringObj(name, Tcl_DStringLength(headPtr));

      Tcl_IncrRefCount(nameObj);
      Tcl_FSMatchInDirectory(interp, Tcl_GetObjResult(interp), nameObj, 
                         NULL, types);
      Tcl_DecrRefCount(nameObj);
      return TCL_OK;
    }
}


/*
 *---------------------------------------------------------------------------
 *
 * TclFileDirname
 *
 *    This procedure calculates the directory above a given 
 *    path: basically 'file dirname'.  It is used both by
 *    the 'dirname' subcommand of file and by code in tclIOUtil.c.
 *
 * Results:
 *    NULL if an error occurred, otherwise a Tcl_Obj owned by
 *    the caller (i.e. most likely with refCount 1).
 *
 * Side effects:
 *      None.
 *
 *---------------------------------------------------------------------------
 */

Tcl_Obj*
TclFileDirname(interp, pathPtr)
    Tcl_Interp *interp;       /* Used for error reporting */
    Tcl_Obj *pathPtr;           /* Path to take dirname of */
{
    int splitElements;
    Tcl_Obj *splitPtr;
    Tcl_Obj *splitResultPtr = NULL;

    /* 
     * The behaviour we want here is slightly different to
     * the standard Tcl_FSSplitPath in the handling of home
     * directories; Tcl_FSSplitPath preserves the "~" while 
     * this code computes the actual full path name, if we
     * had just a single component.
     */         
    splitPtr = Tcl_FSSplitPath(pathPtr, &splitElements);
    if ((splitElements == 1) && (Tcl_GetString(pathPtr)[0] == '~')) {
      Tcl_DecrRefCount(splitPtr);
      splitPtr = Tcl_FSGetNormalizedPath(interp, pathPtr);
      if (splitPtr == NULL) {
          return NULL;
      }
      splitPtr = Tcl_FSSplitPath(splitPtr, &splitElements);
    }

    /*
     * Return all but the last component.  If there is only one
     * component, return it if the path was non-relative, otherwise
     * return the current directory.
     */

    if (splitElements > 1) {
      splitResultPtr = Tcl_FSJoinPath(splitPtr, splitElements - 1);
    } else if (splitElements == 0 || 
      (Tcl_FSGetPathType(pathPtr) == TCL_PATH_RELATIVE)) {
      splitResultPtr = Tcl_NewStringObj(
            ((tclPlatform == TCL_PLATFORM_MAC) ? ":" : "."), 1);
    } else {
      Tcl_ListObjIndex(NULL, splitPtr, 0, &splitResultPtr);
    }
    Tcl_IncrRefCount(splitResultPtr);
    Tcl_DecrRefCount(splitPtr);
    return splitResultPtr;
}

/*
 *---------------------------------------------------------------------------
 *
 * Tcl_AllocStatBuf
 *
 *     This procedure allocates a Tcl_StatBuf on the heap.  It exists
 *     so that extensions may be used unchanged on systems where
 *     largefile support is optional.
 *
 * Results:
 *     A pointer to a Tcl_StatBuf which may be deallocated by being
 *     passed to ckfree().
 *
 * Side effects:
 *      None.
 *
 *---------------------------------------------------------------------------
 */

Tcl_StatBuf *
Tcl_AllocStatBuf() {
    return (Tcl_StatBuf *) ckalloc(sizeof(Tcl_StatBuf));
}

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