예제 #1
0
파일: tkMacOSXMenus.c 프로젝트: das/tcltk
static Tcl_Obj *
GetWidgetDemoPath(
    Tcl_Interp *interp)
{
    Tcl_Obj *libpath, *result = NULL;

    libpath = Tcl_GetVar2Ex(gInterp, "tk_library", NULL, TCL_GLOBAL_ONLY);
    if (libpath) {
	Tcl_Obj *demo[2] = {	Tcl_NewStringObj("demos", 5),
				Tcl_NewStringObj("widget", 6) };
	
	Tcl_IncrRefCount(libpath);
	result = Tcl_FSJoinToPath(libpath, 2, demo);
	Tcl_DecrRefCount(libpath);
    }
    return result;
}
예제 #2
0
파일: tclUnixFile.c 프로젝트: smh377/tcl
Tcl_Obj *
TclpObjLink(
    Tcl_Obj *pathPtr,
    Tcl_Obj *toPtr,
    int linkAction)
{
    if (toPtr != NULL) {
	const char *src = Tcl_FSGetNativePath(pathPtr);
	const char *target = NULL;

	if (src == NULL) {
	    return NULL;
	}

	/*
	 * If we're making a symbolic link and the path is relative, then we
	 * must check whether it exists _relative_ to the directory in which
	 * the src is found (not relative to the current cwd which is just not
	 * relevant in this case).
	 *
	 * If we're making a hard link, then a relative path is just converted
	 * to absolute relative to the cwd.
	 */

	if ((linkAction & TCL_CREATE_SYMBOLIC_LINK)
		&& (Tcl_FSGetPathType(toPtr) == TCL_PATH_RELATIVE)) {
	    Tcl_Obj *dirPtr, *absPtr;

	    dirPtr = TclPathPart(NULL, pathPtr, TCL_PATH_DIRNAME);
	    if (dirPtr == NULL) {
		return NULL;
	    }
	    absPtr = Tcl_FSJoinToPath(dirPtr, 1, &toPtr);
	    Tcl_IncrRefCount(absPtr);
	    if (Tcl_FSAccess(absPtr, F_OK) == -1) {
		Tcl_DecrRefCount(absPtr);
		Tcl_DecrRefCount(dirPtr);

		/*
		 * Target doesn't exist.
		 */

		errno = ENOENT;
		return NULL;
	    }

	    /*
	     * Target exists; we'll construct the relative path we want below.
	     */

	    Tcl_DecrRefCount(absPtr);
	    Tcl_DecrRefCount(dirPtr);
	} else {
	    target = Tcl_FSGetNativePath(toPtr);
	    if (target == NULL) {
		return NULL;
	    }
	    if (access(target, F_OK) == -1) {
		/*
		 * Target doesn't exist.
		 */

		errno = ENOENT;
		return NULL;
	    }
	}

	if (access(src, F_OK) != -1) {
	    /*
	     * Src exists.
	     */

	    errno = EEXIST;
	    return NULL;
	}

	/*
	 * Check symbolic link flag first, since we prefer to create these.
	 */

	if (linkAction & TCL_CREATE_SYMBOLIC_LINK) {
	    int targetLen;
	    Tcl_DString ds;
	    Tcl_Obj *transPtr;

	    /*
	     * Now we don't want to link to the absolute, normalized path.
	     * Relative links are quite acceptable (but links to ~user are not
	     * -- these must be expanded first).
	     */

	    transPtr = Tcl_FSGetTranslatedPath(NULL, toPtr);
	    if (transPtr == NULL) {
		return NULL;
	    }
	    target = TclGetStringFromObj(transPtr, &targetLen);
	    target = Tcl_UtfToExternalDString(NULL, target, targetLen, &ds);
	    Tcl_DecrRefCount(transPtr);

	    if (symlink(target, src) != 0) {
		toPtr = NULL;
	    }
	    Tcl_DStringFree(&ds);
	} else if (linkAction & TCL_CREATE_HARD_LINK) {
	    if (link(target, src) != 0) {
		return NULL;
	    }
	} else {
	    errno = ENODEV;
	    return NULL;
	}
	return toPtr;
    } else {
	Tcl_Obj *linkPtr = NULL;

	char link[MAXPATHLEN];
	int length;
	Tcl_DString ds;
	Tcl_Obj *transPtr;

	transPtr = Tcl_FSGetTranslatedPath(NULL, pathPtr);
	if (transPtr == NULL) {
	    return NULL;
	}
	Tcl_DecrRefCount(transPtr);

	length = readlink(Tcl_FSGetNativePath(pathPtr), link, sizeof(link));
	if (length < 0) {
	    return NULL;
	}

	Tcl_ExternalToUtfDString(NULL, link, length, &ds);
	linkPtr = TclDStringToObj(&ds);
	Tcl_IncrRefCount(linkPtr);
	return linkPtr;
    }
}
예제 #3
0
파일: tclFCmd.c 프로젝트: smh377/tcl
static int
CopyRenameOneFile(
    Tcl_Interp *interp,		/* Used for error reporting. */
    Tcl_Obj *source,		/* Pathname of file to copy. May need to be
				 * translated. */
    Tcl_Obj *target,		/* Pathname of file to create/overwrite. May
				 * need to be translated. */
    int copyFlag,		/* If non-zero, copy files. Otherwise, rename
				 * them. */
    int force)			/* If non-zero, overwrite target file if it
				 * exists. Otherwise, error if target already
				 * exists. */
{
    int result;
    Tcl_Obj *errfile, *errorBuffer;
    Tcl_Obj *actualSource=NULL;	/* If source is a link, then this is the real
				 * file/directory. */
    Tcl_StatBuf sourceStatBuf, targetStatBuf;

    if (Tcl_FSConvertToPathType(interp, source) != TCL_OK) {
	return TCL_ERROR;
    }
    if (Tcl_FSConvertToPathType(interp, target) != TCL_OK) {
	return TCL_ERROR;
    }

    errfile = NULL;
    errorBuffer = NULL;
    result = TCL_ERROR;

    /*
     * We want to copy/rename links and not the files they point to, so we use
     * lstat(). If target is a link, we also want to replace the link and not
     * the file it points to, so we also use lstat() on the target.
     */

    if (Tcl_FSLstat(source, &sourceStatBuf) != 0) {
	errfile = source;
	goto done;
    }
    if (Tcl_FSLstat(target, &targetStatBuf) != 0) {
	if (errno != ENOENT) {
	    errfile = target;
	    goto done;
	}
    } else {
	if (force == 0) {
	    errno = EEXIST;
	    errfile = target;
	    goto done;
	}

	/*
	 * Prevent copying or renaming a file onto itself. On Windows since
	 * 8.5 we do get an inode number, however the unsigned short field is
	 * insufficient to accept the Win32 API file id so it is truncated to
	 * 16 bits and we get collisions. See bug #2015723.
	 */

#if !defined(_WIN32) && !defined(__CYGWIN__)
	if ((sourceStatBuf.st_ino != 0) && (targetStatBuf.st_ino != 0)) {
	    if ((sourceStatBuf.st_ino == targetStatBuf.st_ino) &&
		    (sourceStatBuf.st_dev == targetStatBuf.st_dev)) {
		result = TCL_OK;
		goto done;
	    }
	}
#endif

	/*
	 * Prevent copying/renaming a file onto a directory and vice-versa.
	 * This is a policy decision based on the fact that existing
	 * implementations of copy and rename on all platforms also prevent
	 * this.
	 */

	if (S_ISDIR(sourceStatBuf.st_mode)
		&& !S_ISDIR(targetStatBuf.st_mode)) {
	    errno = EISDIR;
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "can't overwrite file \"%s\" with directory \"%s\"",
		    TclGetString(target), TclGetString(source)));
	    goto done;
	}
	if (!S_ISDIR(sourceStatBuf.st_mode)
		&& S_ISDIR(targetStatBuf.st_mode)) {
	    errno = EISDIR;
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "can't overwrite directory \"%s\" with file \"%s\"",
		    TclGetString(target), TclGetString(source)));
	    goto done;
	}

	/*
	 * The destination exists, but appears to be ok to over-write, and
	 * -force is given. We now try to adjust permissions to ensure the
	 * operation succeeds. If we can't adjust permissions, we'll let the
	 * actual copy/rename return an error later.
	 */

	{
	    Tcl_Obj *perm;
	    int index;

	    TclNewLiteralStringObj(perm, "u+w");
	    Tcl_IncrRefCount(perm);
	    if (TclFSFileAttrIndex(target, "-permissions", &index) == TCL_OK) {
		Tcl_FSFileAttrsSet(NULL, index, target, perm);
	    }
	    Tcl_DecrRefCount(perm);
	}
    }

    if (copyFlag == 0) {
	result = Tcl_FSRenameFile(source, target);
	if (result == TCL_OK) {
	    goto done;
	}

	if (errno == EINVAL) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "error renaming \"%s\" to \"%s\": trying to rename a"
		    " volume or move a directory into itself",
		    TclGetString(source), TclGetString(target)));
	    goto done;
	} else if (errno != EXDEV) {
	    errfile = target;
	    goto done;
	}

	/*
	 * The rename failed because the move was across file systems. Fall
	 * through to copy file and then remove original. Note that the
	 * low-level Tcl_FSRenameFileProc in the filesystem is allowed to
	 * implement cross-filesystem moves itself, if it desires.
	 */
    }

    actualSource = source;
    Tcl_IncrRefCount(actualSource);

    /*
     * Activate the following block to copy files instead of links. However
     * Tcl's semantics currently say we should copy links, so any such change
     * should be the subject of careful study on the consequences.
     *
     * Perhaps there could be an optional flag to 'file copy' to dictate which
     * approach to use, with the default being _not_ to have this block
     * active.
     */

#if 0
#ifdef S_ISLNK
    if (copyFlag && S_ISLNK(sourceStatBuf.st_mode)) {
	/*
	 * We want to copy files not links. Therefore we must follow the link.
	 * There are two purposes to this 'stat' call here. First we want to
	 * know if the linked-file/dir actually exists, and second, in the
	 * block of code which follows, some 20 lines down, we want to check
	 * if the thing is a file or directory.
	 */

	if (Tcl_FSStat(source, &sourceStatBuf) != 0) {
	    /*
	     * Actual file doesn't exist.
	     */

	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "error copying \"%s\": the target of this link doesn't"
		    " exist", TclGetString(source)));
	    goto done;
	} else {
	    int counter = 0;

	    while (1) {
		Tcl_Obj *path = Tcl_FSLink(actualSource, NULL, 0);
		if (path == NULL) {
		    break;
		}

		/*
		 * Now we want to check if this is a relative path, and if so,
		 * to make it absolute.
		 */

		if (Tcl_FSGetPathType(path) == TCL_PATH_RELATIVE) {
		    Tcl_Obj *abs = Tcl_FSJoinToPath(actualSource, 1, &path);

		    if (abs == NULL) {
			break;
		    }
		    Tcl_IncrRefCount(abs);
		    Tcl_DecrRefCount(path);
		    path = abs;
		}
		Tcl_DecrRefCount(actualSource);
		actualSource = path;
		counter++;

		/*
		 * Arbitrary limit of 20 links to follow.
		 */

		if (counter > 20) {
		    /*
		     * Too many links.
		     */

		    Tcl_SetErrno(EMLINK);
		    errfile = source;
		    goto done;
		}
	    }
	    /* Now 'actualSource' is the correct file */
	}
    }
#endif /* S_ISLNK */
#endif

    if (S_ISDIR(sourceStatBuf.st_mode)) {
	result = Tcl_FSCopyDirectory(actualSource, target, &errorBuffer);
	if (result != TCL_OK) {
	    if (errno == EXDEV) {
		/*
		 * The copy failed because we're trying to do a
		 * cross-filesystem copy. We do this through our Tcl library.
		 */

		Tcl_Obj *copyCommand, *cmdObj, *opObj;

		TclNewObj(copyCommand);
		TclNewLiteralStringObj(cmdObj, "::tcl::CopyDirectory");
		Tcl_ListObjAppendElement(interp, copyCommand, cmdObj);
		if (copyFlag) {
		    TclNewLiteralStringObj(opObj, "copying");
		} else {
		    TclNewLiteralStringObj(opObj, "renaming");
		}
		Tcl_ListObjAppendElement(interp, copyCommand, opObj);
		Tcl_ListObjAppendElement(interp, copyCommand, source);
		Tcl_ListObjAppendElement(interp, copyCommand, target);
		Tcl_IncrRefCount(copyCommand);
		result = Tcl_EvalObjEx(interp, copyCommand,
			TCL_EVAL_GLOBAL | TCL_EVAL_DIRECT);
		Tcl_DecrRefCount(copyCommand);
		if (result != TCL_OK) {
		    /*
		     * There was an error in the Tcl-level copy. We will pass
		     * on the Tcl error message and can ensure this by setting
		     * errfile to NULL
		     */

		    errfile = NULL;
		}
	    } else {
		errfile = errorBuffer;
		if (Tcl_FSEqualPaths(errfile, source)) {
		    errfile = source;
		} else if (Tcl_FSEqualPaths(errfile, target)) {
		    errfile = target;
		}
	    }
	}
    } else {
	result = Tcl_FSCopyFile(actualSource, target);
	if ((result != TCL_OK) && (errno == EXDEV)) {
	    result = TclCrossFilesystemCopy(interp, source, target);
	}
	if (result != TCL_OK) {
	    /*
	     * We could examine 'errno' to double-check if the problem was
	     * with the target, but we checked the source above, so it should
	     * be quite clear
	     */

	    errfile = target;
	}
	/*
	 * We now need to reset the result, because the above call,
	 * may have left set it.  (Ideally we would prefer not to pass
	 * an interpreter in above, but the channel IO code used by
	 * TclCrossFilesystemCopy currently requires one)
	 */
	Tcl_ResetResult(interp);
    }
    if ((copyFlag == 0) && (result == TCL_OK)) {
	if (S_ISDIR(sourceStatBuf.st_mode)) {
	    result = Tcl_FSRemoveDirectory(source, 1, &errorBuffer);
	    if (result != TCL_OK) {
		errfile = errorBuffer;
		if (Tcl_FSEqualPaths(errfile, source) == 0) {
		    errfile = source;
		}
	    }
	} else {
	    result = Tcl_FSDeleteFile(source);
	    if (result != TCL_OK) {
		errfile = source;
	    }
	}
	if (result != TCL_OK) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf("can't unlink \"%s\": %s",
		    TclGetString(errfile), Tcl_PosixError(interp)));
	    errfile = NULL;
	}
    }

  done:
    if (errfile != NULL) {
	Tcl_Obj *errorMsg = Tcl_ObjPrintf("error %s \"%s\"",
		(copyFlag ? "copying" : "renaming"), TclGetString(source));

	if (errfile != source) {
	    Tcl_AppendPrintfToObj(errorMsg, " to \"%s\"",
		    TclGetString(target));
	    if (errfile != target) {
		Tcl_AppendPrintfToObj(errorMsg, ": \"%s\"",
			TclGetString(errfile));
	    }
	}
	Tcl_AppendPrintfToObj(errorMsg, ": %s", Tcl_PosixError(interp));
	Tcl_SetObjResult(interp, errorMsg);
    }
    if (errorBuffer != NULL) {
	Tcl_DecrRefCount(errorBuffer);
    }
    if (actualSource != NULL) {
	Tcl_DecrRefCount(actualSource);
    }
    return result;
}