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tclUnixFCmd.c

/*
 * tclUnixFCmd.c
 *
 *    This file implements the unix specific portion of file manipulation
 *    subcommands of the "file" command. All filename arguments should
 *    already be translated to native format.
 *
 * Copyright (c) 1996-1998 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tclUnixFCmd.c,v 1.65 2007/12/13 15:28:42 dgp Exp $
 *
 * Portions of this code were derived from NetBSD source code which has the
 * following copyright notice:
 *
 * Copyright (c) 1988, 1993, 1994
 *      The Regents of the University of California. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors may
 *    be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */

#include "tclInt.h"
#include <utime.h>
#include <grp.h>
#ifndef HAVE_ST_BLKSIZE
#ifndef NO_FSTATFS
#include <sys/statfs.h>
#endif
#endif
#ifdef HAVE_FTS
#include <fts.h>
#endif

/*
 * The following constants specify the type of callback when
 * TraverseUnixTree() calls the traverseProc()
 */

#define DOTREE_PRED     1     /* pre-order directory */
#define DOTREE_POSTD    2     /* post-order directory */
#define DOTREE_F  3     /* regular file */

/*
 * Callbacks for file attributes code.
 */

static int        GetGroupAttribute(Tcl_Interp *interp, int objIndex,
                      Tcl_Obj *fileName, Tcl_Obj **attributePtrPtr);
static int        GetOwnerAttribute(Tcl_Interp *interp, int objIndex,
                      Tcl_Obj *fileName, Tcl_Obj **attributePtrPtr);
static int        GetPermissionsAttribute(Tcl_Interp *interp,
                      int objIndex, Tcl_Obj *fileName,
                      Tcl_Obj **attributePtrPtr);
static int        SetGroupAttribute(Tcl_Interp *interp, int objIndex,
                      Tcl_Obj *fileName, Tcl_Obj *attributePtr);
static int        SetOwnerAttribute(Tcl_Interp *interp, int objIndex,
                      Tcl_Obj *fileName, Tcl_Obj *attributePtr);
static int        SetPermissionsAttribute(Tcl_Interp *interp,
                      int objIndex, Tcl_Obj *fileName,
                      Tcl_Obj *attributePtr);
static int        GetModeFromPermString(Tcl_Interp *interp,
                      char *modeStringPtr, mode_t *modePtr);
#if defined(HAVE_CHFLAGS) && defined(UF_IMMUTABLE)
static int        GetReadOnlyAttribute(Tcl_Interp *interp, int objIndex,
                      Tcl_Obj *fileName, Tcl_Obj **attributePtrPtr);
static int        SetReadOnlyAttribute(Tcl_Interp *interp, int objIndex,
                      Tcl_Obj *fileName, Tcl_Obj *attributePtr);
#endif

/*
 * Prototype for the TraverseUnixTree callback function.
 */

typedef int (TraversalProc)(Tcl_DString *srcPtr, Tcl_DString *dstPtr,
      CONST Tcl_StatBuf *statBufPtr, int type, Tcl_DString *errorPtr);

/*
 * Constants and variables necessary for file attributes subcommand.
 *
 * IMPORTANT: The permissions attribute is assumed to be the third item (i.e.
 * to be indexed with '2' in arrays) in code in tclIOUtil.c and possibly
 * elsewhere in Tcl's core.
 */

#ifdef DJGPP

/*
 * See contrib/djgpp/tclDjgppFCmd.c for definition.
 */

extern TclFileAttrProcs tclpFileAttrProcs[];
extern char *tclpFileAttrStrings[];

#else
enum {
    UNIX_GROUP_ATTRIBUTE, UNIX_OWNER_ATTRIBUTE, UNIX_PERMISSIONS_ATTRIBUTE,
#if defined(HAVE_CHFLAGS) && defined(UF_IMMUTABLE)
    UNIX_READONLY_ATTRIBUTE,
#endif
#ifdef MAC_OSX_TCL
    MACOSX_CREATOR_ATTRIBUTE, MACOSX_TYPE_ATTRIBUTE, MACOSX_HIDDEN_ATTRIBUTE,
    MACOSX_RSRCLENGTH_ATTRIBUTE,
#endif
    UNIX_INVALID_ATTRIBUTE /* lint - last enum value needs no trailing , */
};

MODULE_SCOPE CONST char *tclpFileAttrStrings[];
CONST char *tclpFileAttrStrings[] = {
    "-group", "-owner", "-permissions",
#if defined(HAVE_CHFLAGS) && defined(UF_IMMUTABLE)
    "-readonly",
#endif
#ifdef MAC_OSX_TCL
    "-creator", "-type", "-hidden", "-rsrclength",
#endif
    NULL
};

MODULE_SCOPE CONST TclFileAttrProcs tclpFileAttrProcs[];
CONST TclFileAttrProcs tclpFileAttrProcs[] = {
    {GetGroupAttribute, SetGroupAttribute},
    {GetOwnerAttribute, SetOwnerAttribute},
    {GetPermissionsAttribute, SetPermissionsAttribute},
#if defined(HAVE_CHFLAGS) && defined(UF_IMMUTABLE)
    {GetReadOnlyAttribute, SetReadOnlyAttribute},
#endif
#ifdef MAC_OSX_TCL
    {TclMacOSXGetFileAttribute,     TclMacOSXSetFileAttribute},
    {TclMacOSXGetFileAttribute,     TclMacOSXSetFileAttribute},
    {TclMacOSXGetFileAttribute,     TclMacOSXSetFileAttribute},
    {TclMacOSXGetFileAttribute,     TclMacOSXSetFileAttribute},
#endif
};
#endif

/*
 * This is the maximum number of consecutive readdir/unlink calls that can be
 * made (with no intervening rewinddir or closedir/opendir) before triggering
 * a bug that makes readdir return NULL even though some directory entries
 * have not been processed. The bug afflicts SunOS's readdir when applied to
 * ufs file systems and Darwin 6.5's (and OSX v.10.3.8's) HFS+. JH found the
 * Darwin readdir to reset at 147, so 130 is chosen to be conservative. We
 * can't do a general rewind on failure as NFS can create special files that
 * recreate themselves when you try and delete them. 8.4.8 added a solution
 * that was affected by a single such NFS file, this solution should not be
 * affected by less than THRESHOLD such files. [Bug 1034337]
 */

#define MAX_READDIR_UNLINK_THRESHOLD 130

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

static int        CopyFileAtts(CONST char *src,
                      CONST char *dst, CONST Tcl_StatBuf *statBufPtr);
static int        DoCopyFile(CONST char *srcPtr, CONST char *dstPtr,
                      CONST Tcl_StatBuf *statBufPtr);
static int        DoCreateDirectory(CONST char *pathPtr);
static int        DoRemoveDirectory(Tcl_DString *pathPtr,
                      int recursive, Tcl_DString *errorPtr);
static int        DoRenameFile(CONST char *src, CONST char *dst);
static int        TraversalCopy(Tcl_DString *srcPtr,
                      Tcl_DString *dstPtr, CONST Tcl_StatBuf *statBufPtr,
                      int type, Tcl_DString *errorPtr);
static int        TraversalDelete(Tcl_DString *srcPtr,
                      Tcl_DString *dstPtr, CONST Tcl_StatBuf *statBufPtr,
                      int type, Tcl_DString *errorPtr);
static int        TraverseUnixTree(TraversalProc *traversalProc,
                      Tcl_DString *sourcePtr, Tcl_DString *destPtr,
                      Tcl_DString *errorPtr, int doRewind);

#ifdef PURIFY
/*
 * realpath and purify don't mix happily. It has been noted that realpath
 * should not be used with purify because of bogus warnings, but just
 * memset'ing the resolved path will squelch those. This assumes we are
 * passing the standard MAXPATHLEN size resolved arg.
 */

static char *           Realpath(CONST char *path, char *resolved);

char *
Realpath(
    CONST char *path,
    char *resolved)
{
    memset(resolved, 0, MAXPATHLEN);
    return realpath(path, resolved);
}
#else
#define Realpath realpath
#endif

#ifndef NO_REALPATH
#if defined(__APPLE__) && defined(TCL_THREADS) && \
      defined(MAC_OS_X_VERSION_MIN_REQUIRED) && \
      MAC_OS_X_VERSION_MIN_REQUIRED < 1030
/*
 * Prior to Darwin 7, realpath is not thread-safe, c.f. Bug 711232; if we
 * might potentially be running on pre-10.3 OSX, check Darwin release at
 * runtime before using realpath.
 */

MODULE_SCOPE long tclMacOSXDarwinRelease;
#define haveRealpath (tclMacOSXDarwinRelease >= 7)
#else
#define haveRealpath 1
#endif
#endif /* NO_REALPATH */

#ifdef HAVE_FTS
#ifdef HAVE_STRUCT_STAT64
/* fts doesn't do stat64 */
#define noFtsStat 1
#elif defined(__APPLE__) && defined(__LP64__) && \
      defined(MAC_OS_X_VERSION_MIN_REQUIRED) && \
      MAC_OS_X_VERSION_MIN_REQUIRED < 1050
/*
 * Prior to Darwin 9, 64bit fts_open() without FTS_NOSTAT may crash (due to a
 * 64bit-unsafe ALIGN macro); if we could be running on pre-10.5 OSX, check
 * Darwin release at runtime and do a separate stat() if necessary.
 */

MODULE_SCOPE long tclMacOSXDarwinRelease;
#define noFtsStat (tclMacOSXDarwinRelease < 9)
#else
#define noFtsStat 0
#endif
#endif /* HAVE_FTS */

/*
 *---------------------------------------------------------------------------
 *
 * TclpObjRenameFile, DoRenameFile --
 *
 *    Changes the name of an existing file or directory, from src to dst. If
 *    src and dst refer to the same file or directory, does nothing and
 *    returns success. Otherwise if dst already exists, it will be deleted
 *    and replaced by src subject to the following conditions:
 *        If src is a directory, dst may be an empty directory.
 *        If src is a file, dst may be a file.
 *    In any other situation where dst already exists, the rename will fail.
 *
 * Results:
 *    If the directory was successfully created, returns TCL_OK. Otherwise
 *    the return value is TCL_ERROR and errno is set to indicate the error.
 *    Some possible values for errno are:
 *
 *    EACCES:         src or dst parent directory can't be read and/or written.
 *    EEXIST:         dst is a non-empty directory.
 *    EINVAL:         src is a root directory or dst is a subdirectory of src.
 *    EISDIR:         dst is a directory, but src is not.
 *    ENOENT:         src doesn't exist, or src or dst is "".
 *    ENOTDIR:    src is a directory, but dst is not.
 *    EXDEV:          src and dst are on different filesystems.
 *
 * Side effects:
 *    The implementation of rename may allow cross-filesystem renames, but
 *    the caller should be prepared to emulate it with copy and delete if
 *    errno is EXDEV.
 *
 *---------------------------------------------------------------------------
 */

int
TclpObjRenameFile(
    Tcl_Obj *srcPathPtr,
    Tcl_Obj *destPathPtr)
{
    return DoRenameFile(Tcl_FSGetNativePath(srcPathPtr),
          Tcl_FSGetNativePath(destPathPtr));
}

static int
DoRenameFile(
    CONST char *src,          /* Pathname of file or dir to be renamed
                         * (native). */
    CONST char *dst)          /* New pathname of file or directory
                         * (native). */
{
    if (rename(src, dst) == 0) {                /* INTL: Native. */
      return TCL_OK;
    }
    if (errno == ENOTEMPTY) {
      errno = EEXIST;
    }

    /*
     * IRIX returns EIO when you attept to move a directory into itself. We
     * just map EIO to EINVAL get the right message on SGI. Most platforms
     * don't return EIO except in really strange cases.
     */

    if (errno == EIO) {
      errno = EINVAL;
    }

#ifndef NO_REALPATH
    /*
     * SunOS 4.1.4 reports overwriting a non-empty directory with a directory
     * as EINVAL instead of EEXIST (first rule out the correct EINVAL result
     * code for moving a directory into itself). Must be conditionally
     * compiled because realpath() not defined on all systems.
     */

    if (errno == EINVAL && haveRealpath) {
      char srcPath[MAXPATHLEN], dstPath[MAXPATHLEN];
      DIR *dirPtr;
      Tcl_DirEntry *dirEntPtr;

      if ((Realpath((char *) src, srcPath) != NULL)   /* INTL: Native. */
            && (Realpath((char *) dst, dstPath) != NULL) /* INTL: Native */
            && (strncmp(srcPath, dstPath, strlen(srcPath)) != 0)) {
          dirPtr = opendir(dst);                /* INTL: Native. */
          if (dirPtr != NULL) {
            while (1) {
                dirEntPtr = TclOSreaddir(dirPtr);     /* INTL: Native. */
                if (dirEntPtr == NULL) {
                  break;
                }
                if ((strcmp(dirEntPtr->d_name, ".") != 0) &&
                      (strcmp(dirEntPtr->d_name, "..") != 0)) {
                  errno = EEXIST;
                  closedir(dirPtr);
                  return TCL_ERROR;
                }
            }
            closedir(dirPtr);
          }
      }
      errno = EINVAL;
    }
#endif      /* !NO_REALPATH */

    if (strcmp(src, "/") == 0) {
      /*
       * Alpha reports renaming / as EBUSY and Linux reports it as EACCES,
       * instead of EINVAL.
       */

      errno = EINVAL;
    }

    /*
     * DEC Alpha OSF1 V3.0 returns EACCES when attempting to move a file
     * across filesystems and the parent directory of that file is not
     * writable. Most other systems return EXDEV. Does nothing to correct this
     * behavior.
     */

    return TCL_ERROR;
}

/*
 *---------------------------------------------------------------------------
 *
 * TclpObjCopyFile, DoCopyFile --
 *
 *    Copy a single file (not a directory). If dst already exists and is not
 *    a directory, it is removed.
 *
 * Results:
 *    If the file was successfully copied, returns TCL_OK. Otherwise the
 *    return value is TCL_ERROR and errno is set to indicate the error. Some
 *    possible values for errno are:
 *
 *    EACCES:         src or dst parent directory can't be read and/or written.
 *    EISDIR:         src or dst is a directory.
 *    ENOENT:         src doesn't exist. src or dst is "".
 *
 * Side effects:
 *    This procedure will also copy symbolic links, block, and character
 *    devices, and fifos. For symbolic links, the links themselves will be
 *    copied and not what they point to. For the other special file types,
 *    the directory entry will be copied and not the contents of the device
 *    that it refers to.
 *
 *---------------------------------------------------------------------------
 */

int
TclpObjCopyFile(
    Tcl_Obj *srcPathPtr,
    Tcl_Obj *destPathPtr)
{
    CONST char *src = Tcl_FSGetNativePath(srcPathPtr);
    Tcl_StatBuf srcStatBuf;

    if (TclOSlstat(src, &srcStatBuf) != 0) {          /* INTL: Native. */
      return TCL_ERROR;
    }

    return DoCopyFile(src, Tcl_FSGetNativePath(destPathPtr), &srcStatBuf);
}

static int
DoCopyFile(
    CONST char *src,          /* Pathname of file to be copied (native). */
    CONST char *dst,          /* Pathname of file to copy to (native). */
    CONST Tcl_StatBuf *statBufPtr)
                        /* Used to determine filetype. */
{
    Tcl_StatBuf dstStatBuf;

    if (S_ISDIR(statBufPtr->st_mode)) {
      errno = EISDIR;
      return TCL_ERROR;
    }

    /*
     * Symlink, and some of the other calls will fail if the target exists, so
     * we remove it first.
     */

    if (TclOSlstat(dst, &dstStatBuf) == 0) {          /* INTL: Native. */
      if (S_ISDIR(dstStatBuf.st_mode)) {
          errno = EISDIR;
          return TCL_ERROR;
      }
    }
    if (unlink(dst) != 0) {                     /* INTL: Native. */
      if (errno != ENOENT) {
          return TCL_ERROR;
      }
    }

    switch ((int) (statBufPtr->st_mode & S_IFMT)) {
#ifndef DJGPP
    case S_IFLNK: {
      char link[MAXPATHLEN];
      int length;

      length = readlink(src, link, sizeof(link));     /* INTL: Native. */
      if (length == -1) {
          return TCL_ERROR;
      }
      link[length] = '\0';
      if (symlink(link, dst) < 0) {             /* INTL: Native. */
          return TCL_ERROR;
      }
#ifdef MAC_OSX_TCL
      TclMacOSXCopyFileAttributes(src, dst, statBufPtr);
#endif
      break;
    }
#endif
    case S_IFBLK:
    case S_IFCHR:
      if (mknod(dst, statBufPtr->st_mode,       /* INTL: Native. */
            statBufPtr->st_rdev) < 0) {
          return TCL_ERROR;
      }
      return CopyFileAtts(src, dst, statBufPtr);
    case S_IFIFO:
      if (mkfifo(dst, statBufPtr->st_mode) < 0) {     /* INTL: Native. */
          return TCL_ERROR;
      }
      return CopyFileAtts(src, dst, statBufPtr);
    default:
      return TclUnixCopyFile(src, dst, statBufPtr, 0);
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * TclUnixCopyFile -
 *
 *    Helper function for TclpCopyFile. Copies one regular file, using
 *    read() and write().
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    A file is copied. Dst will be overwritten if it exists.
 *
 *----------------------------------------------------------------------
 */

int
TclUnixCopyFile(
    CONST char *src,          /* Pathname of file to copy (native). */
    CONST char *dst,          /* Pathname of file to create/overwrite
                         * (native). */
    CONST Tcl_StatBuf *statBufPtr,
                        /* Used to determine mode and blocksize. */
    int dontCopyAtts)         /* If flag set, don't copy attributes. */
{
    int srcFd, dstFd;
    unsigned blockSize;       /* Optimal I/O blocksize for filesystem */
    char *buffer;       /* Data buffer for copy */
    size_t nread;

#ifdef DJGPP
#define BINMODE |O_BINARY
#else
#define BINMODE
#endif

    if ((srcFd = TclOSopen(src, O_RDONLY BINMODE, 0)) < 0) { /* INTL: Native */
      return TCL_ERROR;
    }

    dstFd = TclOSopen(dst, O_CREAT|O_TRUNC|O_WRONLY BINMODE, /* INTL: Native */
          statBufPtr->st_mode);
    if (dstFd < 0) {
      close(srcFd);
      return TCL_ERROR;
    }

    /*
     * Try to work out the best size of buffer to use for copying. If we
     * can't, it's no big deal as we can just use a (32-bit) page, since
     * that's likely to be fairly efficient anyway.
     */

#ifdef HAVE_ST_BLKSIZE
    blockSize = statBufPtr->st_blksize;
#elif !defined(NO_FSTATFS)
    {
      struct statfs fs;

      if (fstatfs(srcFd, &fs, sizeof(fs), 0) == 0) {
          blockSize = fs.f_bsize;
      } else {
          blockSize = 4096;
      }
    }
#else
    blockSize = 4096;
#endif /* HAVE_ST_BLKSIZE */

    /*
     * [SF Tcl Bug 1586470] Even if we HAVE_ST_BLKSIZE, there are filesystems
     * which report a bogus value for the blocksize. An example is the Andrew
     * Filesystem (afs), reporting a blocksize of 0. When detecting such a
     * situation we now simply fall back to a hardwired default size.
     */

    if (blockSize <= 0) {
      blockSize = 4096;
    }
    buffer = ckalloc(blockSize);
    while (1) {
      nread = (size_t) read(srcFd, buffer, blockSize);
      if ((nread == (size_t) -1) || (nread == 0)) {
          break;
      }
      if ((size_t) write(dstFd, buffer, nread) != nread) {
          nread = (size_t) -1;
          break;
      }
    }

    ckfree(buffer);
    close(srcFd);
    if ((close(dstFd) != 0) || (nread == (size_t) -1)) {
      unlink(dst);                              /* INTL: Native. */
      return TCL_ERROR;
    }
    if (!dontCopyAtts && CopyFileAtts(src, dst, statBufPtr) == TCL_ERROR) {
      /*
       * The copy succeeded, but setting the permissions failed, so be in a
       * consistent state, we remove the file that was created by the copy.
       */

      unlink(dst);                              /* INTL: Native. */
      return TCL_ERROR;
    }
    return TCL_OK;
}

/*
 *---------------------------------------------------------------------------
 *
 * TclpObjDeleteFile, TclpDeleteFile --
 *
 *    Removes a single file (not a directory).
 *
 * Results:
 *    If the file was successfully deleted, returns TCL_OK. Otherwise the
 *    return value is TCL_ERROR and errno is set to indicate the error. Some
 *    possible values for errno are:
 *
 *    EACCES:         a parent directory can't be read and/or written.
 *    EISDIR:         path is a directory.
 *    ENOENT:         path doesn't exist or is "".
 *
 * Side effects:
 *    The file is deleted, even if it is read-only.
 *
 *---------------------------------------------------------------------------
 */

int
TclpObjDeleteFile(
    Tcl_Obj *pathPtr)
{
    return TclpDeleteFile(Tcl_FSGetNativePath(pathPtr));
}

int
TclpDeleteFile(
    CONST char *path)         /* Pathname of file to be removed (native). */
{
    if (unlink(path) != 0) {                    /* INTL: Native. */
      return TCL_ERROR;
    }
    return TCL_OK;
}

/*
 *---------------------------------------------------------------------------
 *
 * TclpCreateDirectory, DoCreateDirectory --
 *
 *    Creates the specified directory. All parent directories of the
 *    specified directory must already exist. The directory is automatically
 *    created with permissions so that user can access the new directory and
 *    create new files or subdirectories in it.
 *
 * Results:
 *    If the directory was successfully created, returns TCL_OK. Otherwise
 *    the return value is TCL_ERROR and errno is set to indicate the error.
 *    Some possible values for errno are:
 *
 *    EACCES:         a parent directory can't be read and/or written.
 *    EEXIST:         path already exists.
 *    ENOENT:         a parent directory doesn't exist.
 *
 * Side effects:
 *    A directory is created with the current umask, except that permission
 *    for u+rwx will always be added.
 *
 *---------------------------------------------------------------------------
 */

int
TclpObjCreateDirectory(
    Tcl_Obj *pathPtr)
{
    return DoCreateDirectory(Tcl_FSGetNativePath(pathPtr));
}

static int
DoCreateDirectory(
    CONST char *path)         /* Pathname of directory to create (native). */
{
    mode_t mode;

    mode = umask(0);
    umask(mode);

    /*
     * umask return value is actually the inverse of the permissions.
     */

    mode = (0777 & ~mode) | S_IRUSR | S_IWUSR | S_IXUSR;

    if (mkdir(path, mode) != 0) {               /* INTL: Native. */
      return TCL_ERROR;
    }
    return TCL_OK;
}

/*
 *---------------------------------------------------------------------------
 *
 * TclpObjCopyDirectory --
 *
 *    Recursively copies a directory. The target directory dst must not
 *    already exist. Note that this function does not merge two directory
 *    hierarchies, even if the target directory is an an empty directory.
 *
 * Results:
 *    If the directory was successfully copied, returns TCL_OK. Otherwise
 *    the return value is TCL_ERROR, errno is set to indicate the error, and
 *    the pathname of the file that caused the error is stored in errorPtr.
 *    See TclpObjCreateDirectory and TclpObjCopyFile for a description of
 *    possible values for errno.
 *
 * Side effects:
 *    An exact copy of the directory hierarchy src will be created with the
 *    name dst. If an error occurs, the error will be returned immediately,
 *    and remaining files will not be processed.
 *
 *---------------------------------------------------------------------------
 */

int
TclpObjCopyDirectory(
    Tcl_Obj *srcPathPtr,
    Tcl_Obj *destPathPtr,
    Tcl_Obj **errorPtr)
{
    Tcl_DString ds;
    Tcl_DString srcString, dstString;
    int ret;
    Tcl_Obj *transPtr;

    transPtr = Tcl_FSGetTranslatedPath(NULL,srcPathPtr);
    Tcl_UtfToExternalDString(NULL,
          (transPtr != NULL ? TclGetString(transPtr) : NULL),
          -1, &srcString);
    if (transPtr != NULL) {
      Tcl_DecrRefCount(transPtr);
    }
    transPtr = Tcl_FSGetTranslatedPath(NULL,destPathPtr);
    Tcl_UtfToExternalDString(NULL,
          (transPtr != NULL ? TclGetString(transPtr) : NULL),
          -1, &dstString);
    if (transPtr != NULL) {
      Tcl_DecrRefCount(transPtr);
    }

    ret = TraverseUnixTree(TraversalCopy, &srcString, &dstString, &ds, 0);

    Tcl_DStringFree(&srcString);
    Tcl_DStringFree(&dstString);

    if (ret != TCL_OK) {
      *errorPtr = Tcl_NewStringObj(Tcl_DStringValue(&ds), -1);
      Tcl_DStringFree(&ds);
      Tcl_IncrRefCount(*errorPtr);
    }
    return ret;
}

/*
 *---------------------------------------------------------------------------
 *
 * TclpRemoveDirectory, DoRemoveDirectory --
 *
 *    Removes directory (and its contents, if the recursive flag is set).
 *
 * Results:
 *    If the directory was successfully removed, returns TCL_OK. Otherwise
 *    the return value is TCL_ERROR, errno is set to indicate the error, and
 *    the pathname of the file that caused the error is stored in errorPtr.
 *    Some possible values for errno are:
 *
 *    EACCES:         path directory can't be read and/or written.
 *    EEXIST:         path is a non-empty directory.
 *    EINVAL:         path is a root directory.
 *    ENOENT:         path doesn't exist or is "".
 *    ENOTDIR:    path is not a directory.
 *
 * Side effects:
 *    Directory removed. If an error occurs, the error will be returned
 *    immediately, and remaining files will not be deleted.
 *
 *---------------------------------------------------------------------------
 */

int
TclpObjRemoveDirectory(
    Tcl_Obj *pathPtr,
    int recursive,
    Tcl_Obj **errorPtr)
{
    Tcl_DString ds;
    Tcl_DString pathString;
    int ret;
    Tcl_Obj *transPtr = Tcl_FSGetTranslatedPath(NULL, pathPtr);

    Tcl_UtfToExternalDString(NULL,
          (transPtr != NULL ? TclGetString(transPtr) : NULL),
          -1, &pathString);
    if (transPtr != NULL) {
      Tcl_DecrRefCount(transPtr);
    }
    ret = DoRemoveDirectory(&pathString, recursive, &ds);
    Tcl_DStringFree(&pathString);

    if (ret != TCL_OK) {
      *errorPtr = Tcl_NewStringObj(Tcl_DStringValue(&ds), -1);
      Tcl_DStringFree(&ds);
      Tcl_IncrRefCount(*errorPtr);
    }
    return ret;
}

static int
DoRemoveDirectory(
    Tcl_DString *pathPtr,     /* Pathname of directory to be removed
                         * (native). */
    int recursive,            /* If non-zero, removes directories that are
                         * nonempty. Otherwise, will only remove empty
                         * directories. */
    Tcl_DString *errorPtr)    /* If non-NULL, uninitialized or free DString
                         * filled with UTF-8 name of file causing
                         * error. */
{
    CONST char *path;
    mode_t oldPerm = 0;
    int result;

    path = Tcl_DStringValue(pathPtr);

    if (recursive != 0) {
      /*
       * We should try to change permissions so this can be deleted.
       */

      Tcl_StatBuf statBuf;
      int newPerm;

      if (TclOSstat(path, &statBuf) == 0) {
          oldPerm = (mode_t) (statBuf.st_mode & 0x00007FFF);
      }

      newPerm = oldPerm | (64+128+256);
      chmod(path, (mode_t) newPerm);
    }

    if (rmdir(path) == 0) {                     /* INTL: Native. */
      return TCL_OK;
    }
    if (errno == ENOTEMPTY) {
      errno = EEXIST;
    }

    result = TCL_OK;
    if ((errno != EEXIST) || (recursive == 0)) {
      if (errorPtr != NULL) {
          Tcl_ExternalToUtfDString(NULL, path, -1, errorPtr);
      }
      result = TCL_ERROR;
    }

    /*
     * The directory is nonempty, but the recursive flag has been specified,
     * so we recursively remove all the files in the directory.
     */

    if (result == TCL_OK) {
      result = TraverseUnixTree(TraversalDelete, pathPtr, NULL, errorPtr, 1);
    }

    if ((result != TCL_OK) && (recursive != 0)) {
      /*
       * Try to restore permissions.
       */

      chmod(path, oldPerm);
    }
    return result;
}

/*
 *---------------------------------------------------------------------------
 *
 * TraverseUnixTree --
 *
 *    Traverse directory tree specified by sourcePtr, calling the function
 *    traverseProc for each file and directory encountered. If destPtr is
 *    non-null, each of name in the sourcePtr directory is appended to the
 *    directory specified by destPtr and passed as the second argument to
 *    traverseProc().
 *
 * Results:
 *    Standard Tcl result.
 *
 * Side effects:
 *    None caused by TraverseUnixTree, however the user specified
 *    traverseProc() may change state. If an error occurs, the error will be
 *    returned immediately, and remaining files will not be processed.
 *
 *---------------------------------------------------------------------------
 */

static int
TraverseUnixTree(
    TraversalProc *traverseProc,/* Function to call for every file and
                         * directory in source hierarchy. */
    Tcl_DString *sourcePtr,   /* Pathname of source directory to be
                         * traversed (native). */
    Tcl_DString *targetPtr,   /* Pathname of directory to traverse in
                         * parallel with source directory (native). */
    Tcl_DString *errorPtr,    /* If non-NULL, uninitialized or free DString
                         * filled with UTF-8 name of file causing
                         * error. */
    int doRewind)       /* Flag indicating that to ensure complete
                         * traversal of source hierarchy, the readdir
                         * loop should be rewound whenever
                         * traverseProc has returned TCL_OK; this is
                         * required when traverseProc modifies the
                         * source hierarchy, e.g. by deleting
                         * files. */
{
    Tcl_StatBuf statBuf;
    CONST char *source, *errfile;
    int result, sourceLen;
    int targetLen;
#ifndef HAVE_FTS
    int numProcessed = 0;
    Tcl_DirEntry *dirEntPtr;
    DIR *dirPtr;
#else
    CONST char *paths[2] = {NULL, NULL};
    FTS *fts = NULL;
    FTSENT *ent;
#endif

    errfile = NULL;
    result = TCL_OK;
    targetLen = 0;            /* lint. */

    source = Tcl_DStringValue(sourcePtr);
    if (TclOSlstat(source, &statBuf) != 0) {          /* INTL: Native. */
      errfile = source;
      goto end;
    }
    if (!S_ISDIR(statBuf.st_mode)) {
      /*
       * Process the regular file
       */

      return (*traverseProc)(sourcePtr, targetPtr, &statBuf, DOTREE_F,
            errorPtr);
    }
#ifndef HAVE_FTS
    dirPtr = opendir(source);                   /* INTL: Native. */
    if (dirPtr == NULL) {
      /*
       * Can't read directory
       */

      errfile = source;
      goto end;
    }
    result = (*traverseProc)(sourcePtr, targetPtr, &statBuf, DOTREE_PRED,
          errorPtr);
    if (result != TCL_OK) {
      closedir(dirPtr);
      return result;
    }

    Tcl_DStringAppend(sourcePtr, "/", 1);
    sourceLen = Tcl_DStringLength(sourcePtr);

    if (targetPtr != NULL) {
      Tcl_DStringAppend(targetPtr, "/", 1);
      targetLen = Tcl_DStringLength(targetPtr);
    }

    while ((dirEntPtr = TclOSreaddir(dirPtr)) != NULL) { /* INTL: Native. */
      if ((dirEntPtr->d_name[0] == '.')
            && ((dirEntPtr->d_name[1] == '\0')
                  || (strcmp(dirEntPtr->d_name, "..") == 0))) {
          continue;
      }

      /*
       * Append name after slash, and recurse on the file.
       */

      Tcl_DStringAppend(sourcePtr, dirEntPtr->d_name, -1);
      if (targetPtr != NULL) {
          Tcl_DStringAppend(targetPtr, dirEntPtr->d_name, -1);
      }
      result = TraverseUnixTree(traverseProc, sourcePtr, targetPtr,
            errorPtr, doRewind);
      if (result != TCL_OK) {
          break;
      } else {
          numProcessed++;
      }

      /*
       * Remove name after slash.
       */

      Tcl_DStringSetLength(sourcePtr, sourceLen);
      if (targetPtr != NULL) {
          Tcl_DStringSetLength(targetPtr, targetLen);
      }
      if (doRewind && (numProcessed > MAX_READDIR_UNLINK_THRESHOLD)) {
          /*
           * Call rewinddir if we've called unlink or rmdir so many times
           * (since the opendir or the previous rewinddir), to avoid a
           * NULL-return that may a symptom of a buggy readdir.
           */

          rewinddir(dirPtr);
          numProcessed = 0;
      }
    }
    closedir(dirPtr);

    /*
     * Strip off the trailing slash we added
     */

    Tcl_DStringSetLength(sourcePtr, sourceLen - 1);
    if (targetPtr != NULL) {
      Tcl_DStringSetLength(targetPtr, targetLen - 1);
    }

    if (result == TCL_OK) {
      /*
       * Call traverseProc() on a directory after visiting all the files in
       * that directory.
       */

      result = (*traverseProc)(sourcePtr, targetPtr, &statBuf, DOTREE_POSTD,
            errorPtr);
    }
#else /* HAVE_FTS */
    paths[0] = source;
    fts = fts_open((char**)paths, FTS_PHYSICAL | FTS_NOCHDIR |
          (noFtsStat || doRewind ? FTS_NOSTAT : 0), NULL);
    if (fts == NULL) {
      errfile = source;
      goto end;
    }

    sourceLen = Tcl_DStringLength(sourcePtr);
    if (targetPtr != NULL) {
      targetLen = Tcl_DStringLength(targetPtr);
    }

    while ((ent = fts_read(fts)) != NULL) {
      unsigned short info = ent->fts_info;
      char *path = ent->fts_path + sourceLen;
      unsigned short pathlen = ent->fts_pathlen - sourceLen;
      int type;
      Tcl_StatBuf *statBufPtr = NULL;
      
      if (info == FTS_DNR || info == FTS_ERR || info == FTS_NS) {
          errfile = ent->fts_path;
          break;
      }
      Tcl_DStringAppend(sourcePtr, path, pathlen);
      if (targetPtr != NULL) {
          Tcl_DStringAppend(targetPtr, path, pathlen);
      }
      switch (info) {
      case FTS_D:
          type = DOTREE_PRED;
          break;
      case FTS_DP:
          type = DOTREE_POSTD;
          break;
      default:
          type = DOTREE_F;
          break;
      }
      if (!doRewind) { /* no need to stat for delete */
          if (noFtsStat) {
            statBufPtr = &statBuf;
            if (TclOSlstat(ent->fts_path, statBufPtr) != 0) {
                errfile = ent->fts_path;
                break;
            }
          } else {
            statBufPtr = (Tcl_StatBuf *) ent->fts_statp;
          }
      }
      result = (*traverseProc)(sourcePtr, targetPtr, statBufPtr, type,
            errorPtr);
      if (result != TCL_OK) {
          break;
      }
      Tcl_DStringSetLength(sourcePtr, sourceLen);
      if (targetPtr != NULL) {
          Tcl_DStringSetLength(targetPtr, targetLen);
      }
    }
#endif /* HAVE_FTS */

  end:
    if (errfile != NULL) {
      if (errorPtr != NULL) {
          Tcl_ExternalToUtfDString(NULL, errfile, -1, errorPtr);
      }
      result = TCL_ERROR;
    }
#ifdef HAVE_FTS
    if (fts != NULL) {
      fts_close(fts);
    }
#endif

    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * TraversalCopy
 *
 *    Called from TraverseUnixTree in order to execute a recursive copy of a
 *    directory.
 *
 * Results:
 *    Standard Tcl result.
 *
 * Side effects:
 *    The file or directory src may be copied to dst, depending on the value
 *    of type.
 *
 *----------------------------------------------------------------------
 */

static int
TraversalCopy(
    Tcl_DString *srcPtr,      /* Source pathname to copy (native). */
    Tcl_DString *dstPtr,      /* Destination pathname of copy (native). */
    CONST Tcl_StatBuf *statBufPtr,
                        /* Stat info for file specified by srcPtr. */
    int type,                 /* Reason for call - see TraverseUnixTree(). */
    Tcl_DString *errorPtr)    /* If non-NULL, uninitialized or free DString
                         * filled with UTF-8 name of file causing
                         * error. */
{
    switch (type) {
    case DOTREE_F:
      if (DoCopyFile(Tcl_DStringValue(srcPtr), Tcl_DStringValue(dstPtr),
            statBufPtr) == TCL_OK) {
          return TCL_OK;
      }
      break;

    case DOTREE_PRED:
      if (DoCreateDirectory(Tcl_DStringValue(dstPtr)) == TCL_OK) {
          return TCL_OK;
      }
      break;

    case DOTREE_POSTD:
      if (CopyFileAtts(Tcl_DStringValue(srcPtr),
            Tcl_DStringValue(dstPtr), statBufPtr) == TCL_OK) {
          return TCL_OK;
      }
      break;
    }

    /*
     * There shouldn't be a problem with src, because we already checked it to
     * get here.
     */

    if (errorPtr != NULL) {
      Tcl_ExternalToUtfDString(NULL, Tcl_DStringValue(dstPtr),
            Tcl_DStringLength(dstPtr), errorPtr);
    }
    return TCL_ERROR;
}

/*
 *---------------------------------------------------------------------------
 *
 * TraversalDelete --
 *
 *    Called by procedure TraverseUnixTree for every file and directory that
 *    it encounters in a directory hierarchy. This procedure unlinks files,
 *    and removes directories after all the containing files have been
 *    processed.
 *
 * Results:
 *    Standard Tcl result.
 *
 * Side effects:
 *    Files or directory specified by src will be deleted.
 *
 *----------------------------------------------------------------------
 */

static int
TraversalDelete(
    Tcl_DString *srcPtr,      /* Source pathname (native). */
    Tcl_DString *ignore,      /* Destination pathname (not used). */
    CONST Tcl_StatBuf *statBufPtr,
                        /* Stat info for file specified by srcPtr. */
    int type,                 /* Reason for call - see TraverseUnixTree(). */
    Tcl_DString *errorPtr)    /* If non-NULL, uninitialized or free DString
                         * filled with UTF-8 name of file causing
                         * error. */
{
    switch (type) {
    case DOTREE_F:
      if (TclpDeleteFile(Tcl_DStringValue(srcPtr)) == 0) {
          return TCL_OK;
      }
      break;
    case DOTREE_PRED:
      return TCL_OK;
    case DOTREE_POSTD:
      if (DoRemoveDirectory(srcPtr, 0, NULL) == 0) {
          return TCL_OK;
      }
      break;
    }
    if (errorPtr != NULL) {
      Tcl_ExternalToUtfDString(NULL, Tcl_DStringValue(srcPtr),
            Tcl_DStringLength(srcPtr), errorPtr);
    }
    return TCL_ERROR;
}

/*
 *---------------------------------------------------------------------------
 *
 * CopyFileAtts --
 *
 *    Copy the file attributes such as owner, group, permissions, and
 *    modification date from one file to another.
 *
 * Results:
 *    Standard Tcl result.
 *
 * Side effects:
 *    User id, group id, permission bits, last modification time, and last
 *    access time are updated in the new file to reflect the old file.
 *
 *---------------------------------------------------------------------------
 */

static int
CopyFileAtts(
    CONST char *src,          /* Path name of source file (native). */
    CONST char *dst,          /* Path name of target file (native). */
    CONST Tcl_StatBuf *statBufPtr)
                        /* Stat info for source file */
{
    struct utimbuf tval;
    mode_t newMode;

    newMode = statBufPtr->st_mode
          & (S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO);

    /*
     * Note that if you copy a setuid file that is owned by someone else, and
     * you are not root, then the copy will be setuid to you. The most correct
     * implementation would probably be to have the copy not setuid to anyone
     * if the original file was owned by someone else, but this corner case
     * isn't currently handled. It would require another lstat(), or getuid().
     */

    if (chmod(dst, newMode)) {                        /* INTL: Native. */
      newMode &= ~(S_ISUID | S_ISGID);
      if (chmod(dst, newMode)) {                /* INTL: Native. */
          return TCL_ERROR;
      }
    }

    tval.actime = statBufPtr->st_atime;
    tval.modtime = statBufPtr->st_mtime;

    if (utime(dst, &tval)) {                    /* INTL: Native. */
      return TCL_ERROR;
    }
#ifdef MAC_OSX_TCL
    TclMacOSXCopyFileAttributes(src, dst, statBufPtr);
#endif
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * GetGroupAttribute
 *
 *    Gets the group attribute of a file.
 *
 * Results:
 *    Standard TCL result. Returns a new Tcl_Obj in attributePtrPtr if there
 *    is no error.
 *
 * Side effects:
 *    A new object is allocated.
 *
 *----------------------------------------------------------------------
 */

static int
GetGroupAttribute(
    Tcl_Interp *interp,       /* The interp we are using for errors. */
    int objIndex,       /* The index of the attribute. */
    Tcl_Obj *fileName,        /* The name of the file (UTF-8). */
    Tcl_Obj **attributePtrPtr)      /* A pointer to return the object with. */
{
    Tcl_StatBuf statBuf;
    struct group *groupPtr;
    int result;

    result = TclpObjStat(fileName, &statBuf);

    if (result != 0) {
      if (interp != NULL) {
          Tcl_AppendResult(interp, "could not read \"",
                TclGetString(fileName), "\": ",
                Tcl_PosixError(interp), NULL);
      }
      return TCL_ERROR;
    }

    groupPtr = TclpGetGrGid(statBuf.st_gid);

    if (groupPtr == NULL) {
      *attributePtrPtr = Tcl_NewIntObj((int) statBuf.st_gid);
    } else {
      Tcl_DString ds;
      CONST char *utf;

      utf = Tcl_ExternalToUtfDString(NULL, groupPtr->gr_name, -1, &ds);
      *attributePtrPtr = Tcl_NewStringObj(utf, -1);
      Tcl_DStringFree(&ds);
    }
    endgrent();
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * GetOwnerAttribute
 *
 *    Gets the owner attribute of a file.
 *
 * Results:
 *    Standard TCL result. Returns a new Tcl_Obj in attributePtrPtr if there
 *    is no error.
 *
 * Side effects:
 *    A new object is allocated.
 *
 *----------------------------------------------------------------------
 */

static int
GetOwnerAttribute(
    Tcl_Interp *interp,       /* The interp we are using for errors. */
    int objIndex,       /* The index of the attribute. */
    Tcl_Obj *fileName,        /* The name of the file (UTF-8). */
    Tcl_Obj **attributePtrPtr)      /* A pointer to return the object with. */
{
    Tcl_StatBuf statBuf;
    struct passwd *pwPtr;
    int result;

    result = TclpObjStat(fileName, &statBuf);

    if (result != 0) {
      if (interp != NULL) {
          Tcl_AppendResult(interp, "could not read \"",
                TclGetString(fileName), "\": ",
                Tcl_PosixError(interp), NULL);
      }
      return TCL_ERROR;
    }

    pwPtr = TclpGetPwUid(statBuf.st_uid);

    if (pwPtr == NULL) {
      *attributePtrPtr = Tcl_NewIntObj((int) statBuf.st_uid);
    } else {
      Tcl_DString ds;
      CONST char *utf;

      utf = Tcl_ExternalToUtfDString(NULL, pwPtr->pw_name, -1, &ds);
      *attributePtrPtr = Tcl_NewStringObj(utf, Tcl_DStringLength(&ds));
      Tcl_DStringFree(&ds);
    }
    endpwent();
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * GetPermissionsAttribute
 *
 *    Gets the group attribute of a file.
 *
 * Results:
 *    Standard TCL result. Returns a new Tcl_Obj in attributePtrPtr if there
 *    is no error. The object will have ref count 0.
 *
 * Side effects:
 *    A new object is allocated.
 *
 *----------------------------------------------------------------------
 */

static int
GetPermissionsAttribute(
    Tcl_Interp *interp,           /* The interp we are using for errors. */
    int objIndex,           /* The index of the attribute. */
    Tcl_Obj *fileName,            /* The name of the file (UTF-8). */
    Tcl_Obj **attributePtrPtr)          /* A pointer to return the object with. */
{
    Tcl_StatBuf statBuf;
    int result;

    result = TclpObjStat(fileName, &statBuf);

    if (result != 0) {
      if (interp != NULL) {
          Tcl_AppendResult(interp, "could not read \"",
                TclGetString(fileName), "\": ",
                Tcl_PosixError(interp), NULL);
      }
      return TCL_ERROR;
    }

    *attributePtrPtr = Tcl_ObjPrintf(
          "%0#5lo", (long) (statBuf.st_mode & 0x00007FFF));
    return TCL_OK;
}

/*
 *---------------------------------------------------------------------------
 *
 * SetGroupAttribute --
 *
 *    Sets the group of the file to the specified group.
 *
 * Results:
 *    Standard TCL result.
 *
 * Side effects:
 *    As above.
 *
 *---------------------------------------------------------------------------
 */

static int
SetGroupAttribute(
    Tcl_Interp *interp,       /* The interp for error reporting. */
    int objIndex,       /* The index of the attribute. */
    Tcl_Obj *fileName,        /* The name of the file (UTF-8). */
    Tcl_Obj *attributePtr)    /* New group for file. */
{
    long gid;
    int result;
    CONST char *native;

    if (Tcl_GetLongFromObj(NULL, attributePtr, &gid) != TCL_OK) {
      Tcl_DString ds;
      struct group *groupPtr = NULL;
      CONST char *string;
      int length;

      string = Tcl_GetStringFromObj(attributePtr, &length);

      native = Tcl_UtfToExternalDString(NULL, string, length, &ds);
      groupPtr = TclpGetGrNam(native); /* INTL: Native. */
      Tcl_DStringFree(&ds);

      if (groupPtr == NULL) {
          endgrent();
          if (interp != NULL) {
            Tcl_AppendResult(interp, "could not set group for file \"",
                  TclGetString(fileName), "\": group \"", string,
                  "\" does not exist", NULL);
          }
          return TCL_ERROR;
      }
      gid = groupPtr->gr_gid;
    }

    native = Tcl_FSGetNativePath(fileName);
    result = chown(native, (uid_t) -1, (gid_t) gid);  /* INTL: Native. */

    endgrent();
    if (result != 0) {
      if (interp != NULL) {
          Tcl_AppendResult(interp, "could not set group for file \"",
                TclGetString(fileName), "\": ", Tcl_PosixError(interp),
                NULL);
      }
      return TCL_ERROR;
    }
    return TCL_OK;
}

/*
 *---------------------------------------------------------------------------
 *
 * SetOwnerAttribute --
 *
 *    Sets the owner of the file to the specified owner.
 *
 * Results:
 *    Standard TCL result.
 *
 * Side effects:
 *    As above.
 *
 *---------------------------------------------------------------------------
 */

static int
SetOwnerAttribute(
    Tcl_Interp *interp,       /* The interp for error reporting. */
    int objIndex,       /* The index of the attribute. */
    Tcl_Obj *fileName,        /* The name of the file (UTF-8). */
    Tcl_Obj *attributePtr)    /* New owner for file. */
{
    long uid;
    int result;
    CONST char *native;

    if (Tcl_GetLongFromObj(NULL, attributePtr, &uid) != TCL_OK) {
      Tcl_DString ds;
      struct passwd *pwPtr = NULL;
      CONST char *string;
      int length;

      string = Tcl_GetStringFromObj(attributePtr, &length);

      native = Tcl_UtfToExternalDString(NULL, string, length, &ds);
      pwPtr = TclpGetPwNam(native); /* INTL: Native. */
      Tcl_DStringFree(&ds);

      if (pwPtr == NULL) {
          if (interp != NULL) {
            Tcl_AppendResult(interp, "could not set owner for file \"",
                  TclGetString(fileName), "\": user \"", string,
                  "\" does not exist", NULL);
          }
          return TCL_ERROR;
      }
      uid = pwPtr->pw_uid;
    }

    native = Tcl_FSGetNativePath(fileName);
    result = chown(native, (uid_t) uid, (gid_t) -1);  /* INTL: Native. */

    if (result != 0) {
      if (interp != NULL) {
          Tcl_AppendResult(interp, "could not set owner for file \"",
                TclGetString(fileName), "\": ", Tcl_PosixError(interp),
                NULL);
      }
      return TCL_ERROR;
    }
    return TCL_OK;
}

/*
 *---------------------------------------------------------------------------
 *
 * SetPermissionsAttribute
 *
 *    Sets the file to the given permission.
 *
 * Results:
 *    Standard TCL result.
 *
 * Side effects:
 *    The permission of the file is changed.
 *
 *---------------------------------------------------------------------------
 */

static int
SetPermissionsAttribute(
    Tcl_Interp *interp,       /* The interp we are using for errors. */
    int objIndex,       /* The index of the attribute. */
    Tcl_Obj *fileName,        /* The name of the file (UTF-8). */
    Tcl_Obj *attributePtr)    /* The attribute to set. */
{
    long mode;
    mode_t newMode;
    int result = TCL_ERROR;
    CONST char *native;
    char *modeStringPtr = TclGetString(attributePtr);
    int scanned = TclParseAllWhiteSpace(modeStringPtr, -1);

    /*
     * First supply support for octal number format
     */

    if ((modeStringPtr[scanned] == '0')
          && (modeStringPtr[scanned+1] >= '0')
          && (modeStringPtr[scanned+1] <= '7')) {
      /* Leading zero - attempt octal interpretation */
      Tcl_Obj *modeObj;

      TclNewLiteralStringObj(modeObj, "0o");
      Tcl_AppendToObj(modeObj, modeStringPtr+scanned+1, -1);
      result = Tcl_GetLongFromObj(NULL, modeObj, &mode);
      Tcl_DecrRefCount(modeObj);
    }
    if (result == TCL_OK
          || Tcl_GetLongFromObj(NULL, attributePtr, &mode) == TCL_OK) {
      newMode = (mode_t) (mode & 0x00007FFF);
    } else {
      Tcl_StatBuf buf;

      /*
       * Try the forms "rwxrwxrwx" and "ugo=rwx"
       *
       * We get the current mode of the file, in order to allow for ug+-=rwx
       * style chmod strings.
       */

      result = TclpObjStat(fileName, &buf);
      if (result != 0) {
          if (interp != NULL) {
            Tcl_AppendResult(interp, "could not read \"",
                  TclGetString(fileName), "\": ",
                  Tcl_PosixError(interp), NULL);
          }
          return TCL_ERROR;
      }
      newMode = (mode_t) (buf.st_mode & 0x00007FFF);

      if (GetModeFromPermString(NULL, modeStringPtr, &newMode) != TCL_OK) {
          if (interp != NULL) {
            Tcl_AppendResult(interp, "unknown permission string format \"",
                  modeStringPtr, "\"", NULL);
          }
          return TCL_ERROR;
      }
    }

    native = Tcl_FSGetNativePath(fileName);
    result = chmod(native, newMode);            /* INTL: Native. */
    if (result != 0) {
      if (interp != NULL) {
          Tcl_AppendResult(interp, "could not set permissions for file \"",
                TclGetString(fileName), "\": ",
                Tcl_PosixError(interp), NULL);
      }
      return TCL_ERROR;
    }
    return TCL_OK;
}

#ifndef DJGPP
/*
 *---------------------------------------------------------------------------
 *
 * TclpObjListVolumes --
 *
 *    Lists the currently mounted volumes, which on UNIX is just /.
 *
 * Results:
 *    The list of volumes.
 *
 * Side effects:
 *    None.
 *
 *---------------------------------------------------------------------------
 */

Tcl_Obj *
TclpObjListVolumes(void)
{
    Tcl_Obj *resultPtr = Tcl_NewStringObj("/", 1);

    Tcl_IncrRefCount(resultPtr);
    return resultPtr;
}
#endif

/*
 *----------------------------------------------------------------------
 *
 * GetModeFromPermString --
 *
 *    This procedure is invoked to process the "file permissions" Tcl
 *    command, to check for a "rwxrwxrwx" or "ugoa+-=rwxst" string. See the
 *    user documentation for details on what it does.
 *
 * Results:
 *    A standard Tcl result.
 *
 * Side effects:
 *    See the user documentation.
 *
 *----------------------------------------------------------------------
 */

static int
GetModeFromPermString(
    Tcl_Interp *interp,       /* The interp we are using for errors. */
    char *modeStringPtr,      /* Permissions string */
    mode_t *modePtr)          /* pointer to the mode value */
{
    mode_t newMode;
    mode_t oldMode;           /* Storage for the value of the old mode (that
                         * is passed in), to allow for the chmod style
                         * manipulation. */
    int i,n, who, op, what, op_found, who_found;

    /*
     * We start off checking for an "rwxrwxrwx" style permissions string
     */

    if (strlen(modeStringPtr) != 9) {
      goto chmodStyleCheck;
    }

    newMode = 0;
    for (i = 0; i < 9; i++) {
      switch (*(modeStringPtr+i)) {
      case 'r':
          if ((i%3) != 0) {
            goto chmodStyleCheck;
          }
          newMode |= (1<<(8-i));
          break;
      case 'w':
          if ((i%3) != 1) {
            goto chmodStyleCheck;
          }
          newMode |= (1<<(8-i));
          break;
      case 'x':
          if ((i%3) != 2) {
            goto chmodStyleCheck;
          }
          newMode |= (1<<(8-i));
          break;
      case 's':
          if (((i%3) != 2) || (i > 5)) {
            goto chmodStyleCheck;
          }
          newMode |= (1<<(8-i));
          newMode |= (1<<(11-(i/3)));
          break;
      case 'S':
          if (((i%3) != 2) || (i > 5)) {
            goto chmodStyleCheck;
          }
          newMode |= (1<<(11-(i/3)));
          break;
      case 't':
          if (i != 8) {
            goto chmodStyleCheck;
          }
          newMode |= (1<<(8-i));
          newMode |= (1<<9);
          break;
      case 'T':
          if (i != 8) {
            goto chmodStyleCheck;
          }
          newMode |= (1<<9);
          break;
      case '-':
          break;
      default:
          /*
           * Oops, not what we thought it was, so go on
           */
          goto chmodStyleCheck;
      }
    }
    *modePtr = newMode;
    return TCL_OK;

  chmodStyleCheck:
    /*
     * We now check for an "ugoa+-=rwxst" style permissions string
     */

    for (n = 0 ; *(modeStringPtr+n) != '\0' ; n = n + i) {
      oldMode = *modePtr;
      who = op = what = op_found = who_found = 0;
      for (i = 0 ; *(modeStringPtr+n+i) != '\0' ; i++ ) {
          if (!who_found) {
            /* who */
            switch (*(modeStringPtr+n+i)) {
            case 'u':
                who |= 0x9c0;
                continue;
            case 'g':
                who |= 0x438;
                continue;
            case 'o':
                who |= 0x207;
                continue;
            case 'a':
                who |= 0xfff;
                continue;
            }
          }
          who_found = 1;
          if (who == 0) {
            who = 0xfff;
          }
          if (!op_found) {
            /* op */
            switch (*(modeStringPtr+n+i)) {
            case '+':
                op = 1;
                op_found = 1;
                continue;
            case '-':
                op = 2;
                op_found = 1;
                continue;
            case '=':
                op = 3;
                op_found = 1;
                continue;
            default:
                return TCL_ERROR;
            }
          }
          /* what */
          switch (*(modeStringPtr+n+i)) {
          case 'r':
            what |= 0x124;
            continue;
          case 'w':
            what |= 0x92;
            continue;
          case 'x':
            what |= 0x49;
            continue;
          case 's':
            what |= 0xc00;
            continue;
          case 't':
            what |= 0x200;
            continue;
          case ',':
            break;
          default:
            return TCL_ERROR;
          }
          if (*(modeStringPtr+n+i) == ',') {
            i++;
            break;
          }
      }
      switch (op) {
      case 1:
          *modePtr = oldMode | (who & what);
          continue;
      case 2:
          *modePtr = oldMode & ~(who & what);
          continue;
      case 3:
          *modePtr = (oldMode & ~who) | (who & what);
          continue;
      }
    }
    return TCL_OK;
}

/*
 *---------------------------------------------------------------------------
 *
 * TclpObjNormalizePath --
 *
 *    This function scans through a path specification and replaces it, in
 *    place, with a normalized version. A normalized version is one in which
 *    all symlinks in the path are replaced with their expanded form (except
 *    a symlink at the very end of the path).
 *
 * Results:
 *    The new 'nextCheckpoint' value, giving as far as we could understand
 *    in the path.
 *
 * Side effects:
 *    The pathPtr string, is modified.
 *
 *---------------------------------------------------------------------------
 */

int
TclpObjNormalizePath(
    Tcl_Interp *interp,
    Tcl_Obj *pathPtr,
    int nextCheckpoint)
{
    char *currentPathEndPosition;
    int pathLen;
    char cur;
    char *path = Tcl_GetStringFromObj(pathPtr, &pathLen);
#ifndef NO_REALPATH
    char normPath[MAXPATHLEN];
    Tcl_DString ds;
    CONST char *nativePath;
#endif

    /*
     * We add '1' here because if nextCheckpoint is zero we know that '/'
     * exists, and if it isn't zero, it must point at a directory separator
     * which we also know exists.
     */

    currentPathEndPosition = path + nextCheckpoint;
    if (*currentPathEndPosition == '/') {
      currentPathEndPosition++;
    }

#ifndef NO_REALPATH
    /*
     * For speed, try to get the entire path in one go.
     */

    if (nextCheckpoint == 0 && haveRealpath) {
      char *lastDir = strrchr(currentPathEndPosition, '/');

      if (lastDir != NULL) {
          nativePath = Tcl_UtfToExternalDString(NULL, path,
                lastDir-path, &ds);
          if (Realpath(nativePath, normPath) != NULL) {
            if (*nativePath != '/' && *normPath == '/') {
                /*
                 * realpath has transformed a relative path into an
                 * absolute path, we do not know how to handle this.
                 */
            } else {
                nextCheckpoint = lastDir - path;
                goto wholeStringOk;
            }
          }
          Tcl_DStringFree(&ds);
      }
    }

    /*
     * Else do it the slow way.
     */
#endif

    while (1) {
      cur = *currentPathEndPosition;
      if ((cur == '/') && (path != currentPathEndPosition)) {
          /*
           * Reached directory separator.
           */

          Tcl_DString ds;
          CONST char *nativePath;
          int accessOk;

          nativePath = Tcl_UtfToExternalDString(NULL, path,
                currentPathEndPosition - path, &ds);
          accessOk = access(nativePath, F_OK);
          Tcl_DStringFree(&ds);

          if (accessOk != 0) {
            /*
             * File doesn't exist.
             */

            break;
          }

          /*
           * Update the acceptable point.
           */

          nextCheckpoint = currentPathEndPosition - path;
      } else if (cur == 0) {
          /*
           * Reached end of string.
           */

          break;
      }
      currentPathEndPosition++;
    }

    /*
     * We should really now convert this to a canonical path. We do that with
     * 'realpath' if we have it available. Otherwise we could step through
     * every single path component, checking whether it is a symlink, but that
     * would be a lot of work, and most modern OSes have 'realpath'.
     */

#ifndef NO_REALPATH
    if (haveRealpath) {
      /*
       * If we only had '/foo' or '/' then we never increment nextCheckpoint
       * and we don't need or want to go through 'Realpath'. Also, on some
       * platforms, passing an empty string to 'Realpath' will give us the
       * normalized pwd, which is not what we want at all!
       */

      if (nextCheckpoint == 0) {
          return 0;
      }

      nativePath = Tcl_UtfToExternalDString(NULL, path, nextCheckpoint, &ds);
      if (Realpath(nativePath, normPath) != NULL) {
          int newNormLen;

      wholeStringOk:
          newNormLen = strlen(normPath);
          if ((newNormLen == Tcl_DStringLength(&ds))
                && (strcmp(normPath, nativePath) == 0)) {
            /*
             * String is unchanged.
             */

            Tcl_DStringFree(&ds);

            /*
             * Enable this to have the native FS claim normalization of
             * the whole path for existing files. That would permit the
             * caller to declare normalization complete without calls to
             * additional filesystems. Saving lots of calls is probably
             * worth the extra access() time here. When no other FS's are
             * registered though, things are less clear.
             *
            if (0 == access(normPath, F_OK)) {
                return pathLen;
            }
             */

            return nextCheckpoint;
          }

          /*
           * Free up the native path and put in its place the converted,
           * normalized path.
           */

          Tcl_DStringFree(&ds);
          Tcl_ExternalToUtfDString(NULL, normPath, (int) newNormLen, &ds);

          if (path[nextCheckpoint] != '\0') {
            /*
             * Not at end, append remaining path.
             */

            int normLen = Tcl_DStringLength(&ds);

            Tcl_DStringAppend(&ds, path + nextCheckpoint,
                  pathLen - nextCheckpoint);

            /*
             * We recognise up to and including the directory separator.
             */

            nextCheckpoint = normLen + 1;
          } else {
            /*
             * We recognise the whole string.
             */

            nextCheckpoint = Tcl_DStringLength(&ds);
          }

          /*
           * Overwrite with the normalized path.
           */

          Tcl_SetStringObj(pathPtr, Tcl_DStringValue(&ds),
                Tcl_DStringLength(&ds));
      }
      Tcl_DStringFree(&ds);
    }
#endif      /* !NO_REALPATH */

    return nextCheckpoint;
}

#if defined(HAVE_CHFLAGS) && defined(UF_IMMUTABLE)
/*
 *----------------------------------------------------------------------
 *
 * GetReadOnlyAttribute
 *
 *    Gets the readonly attribute (user immutable flag) of a file.
 *
 * Results:
 *    Standard TCL result. Returns a new Tcl_Obj in attributePtrPtr if there
 *    is no error. The object will have ref count 0.
 *
 * Side effects:
 *    A new object is allocated.
 *
 *----------------------------------------------------------------------
 */

static int
GetReadOnlyAttribute(
    Tcl_Interp *interp,       /* The interp we are using for errors. */
    int objIndex,       /* The index of the attribute. */
    Tcl_Obj *fileName,        /* The name of the file (UTF-8). */
    Tcl_Obj **attributePtrPtr)      /* A pointer to return the object with. */
{
    Tcl_StatBuf statBuf;
    int result;

    result = TclpObjStat(fileName, &statBuf);

    if (result != 0) {
      if (interp != NULL) {
          Tcl_AppendResult(interp, "could not read \"",
                TclGetString(fileName), "\": ", Tcl_PosixError(interp),
                NULL);
      }
      return TCL_ERROR;
    }

    *attributePtrPtr = Tcl_NewBooleanObj((statBuf.st_flags&UF_IMMUTABLE) != 0);

    return TCL_OK;
}

/*
 *---------------------------------------------------------------------------
 *
 * SetReadOnlyAttribute
 *
 *    Sets the readonly attribute (user immutable flag) of a file.
 *
 * Results:
 *    Standard TCL result.
 *
 * Side effects:
 *    The readonly attribute of the file is changed.
 *
 *---------------------------------------------------------------------------
 */

static int
SetReadOnlyAttribute(
    Tcl_Interp *interp,       /* The interp we are using for errors. */
    int objIndex,       /* The index of the attribute. */
    Tcl_Obj *fileName,        /* The name of the file (UTF-8). */
    Tcl_Obj *attributePtr)    /* The attribute to set. */
{
    Tcl_StatBuf statBuf;
    int result;
    int readonly;
    CONST char *native;

    if (Tcl_GetBooleanFromObj(interp, attributePtr, &readonly) != TCL_OK) {
      return TCL_ERROR;
    }

    result = TclpObjStat(fileName, &statBuf);

    if (result != 0) {
      if (interp != NULL) {
          Tcl_AppendResult(interp, "could not read \"",
                TclGetString(fileName), "\": ", Tcl_PosixError(interp),
                NULL);
      }
      return TCL_ERROR;
    }

    if (readonly) {
      statBuf.st_flags |= UF_IMMUTABLE;
    } else {
      statBuf.st_flags &= ~UF_IMMUTABLE;
    }

    native = Tcl_FSGetNativePath(fileName);
    result = chflags(native, statBuf.st_flags);       /* INTL: Native. */
    if (result != 0) {
      if (interp != NULL) {
          Tcl_AppendResult(interp, "could not set flags for file \"",
                TclGetString(fileName), "\": ", Tcl_PosixError(interp),
                NULL);
      }
      return TCL_ERROR;
    }
    return TCL_OK;
}
#endif /* defined(HAVE_CHFLAGS) && defined(UF_IMMUTABLE) */

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */

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