/*
* tclPathObj.c --
*
* This file contains the implementation of Tcl's "path" object type used
* to represent and manipulate a general (virtual) filesystem entity in
* an efficient manner.
*
* Copyright © 2003 Vince Darley.
*
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*/
#include "tclInt.h"
#include "tclFileSystem.h"
#include <assert.h>
/*
* Prototypes for functions defined later in this file.
*/
static Tcl_Obj * AppendPath(Tcl_Obj *head, Tcl_Obj *tail);
static void DupFsPathInternalRep(Tcl_Obj *srcPtr,
Tcl_Obj *copyPtr);
static void FreeFsPathInternalRep(Tcl_Obj *pathPtr);
static void UpdateStringOfFsPath(Tcl_Obj *pathPtr);
static int SetFsPathFromAny(Tcl_Interp *interp, Tcl_Obj *pathPtr);
static int FindSplitPos(const char *path, int separator);
static int IsSeparatorOrNull(int ch);
static Tcl_Obj * GetExtension(Tcl_Obj *pathPtr);
static int MakePathFromNormalized(Tcl_Interp *interp,
Tcl_Obj *pathPtr);
/*
* Define the 'path' object type, which Tcl uses to represent file paths
* internally.
*/
static const Tcl_ObjType fsPathType = {
"path", /* name */
FreeFsPathInternalRep, /* freeIntRepProc */
DupFsPathInternalRep, /* dupIntRepProc */
UpdateStringOfFsPath, /* updateStringProc */
SetFsPathFromAny /* setFromAnyProc */
};
/*
* struct FsPath --
*
* Internal representation of a Tcl_Obj of fsPathType
*/
typedef struct FsPath {
Tcl_Obj *translatedPathPtr; /* If the path has been normalized (flags ==
* 0), this is NULL. Otherwise it is a path
* in which any ~user sequences have been
* translated away. */
Tcl_Obj *normPathPtr; /* If the path has been normalized (flags ==
* 0), this is an absolute path without ., ..
* or ~user components. Otherwise it is a
* path, possibly absolute, to normalize
* relative to cwdPtr. */
Tcl_Obj *cwdPtr; /* If NULL, either translatedPtr exists or
* normPathPtr exists and is absolute. */
int flags; /* Flags to describe interpretation - see
* below. */
ClientData nativePathPtr; /* Native representation of this path, which
* is filesystem dependent. */
int filesystemEpoch; /* Used to ensure the path representation was
* generated during the correct filesystem
* epoch. The epoch changes when
* filesystem-mounts are changed. */
const Tcl_Filesystem *fsPtr;/* The Tcl_Filesystem that claims this path */
} FsPath;
/*
* Flag values for FsPath->flags.
*/
#define TCLPATH_APPENDED 1
#define TCLPATH_NEEDNORM 4
/*
* Define some macros to give us convenient access to path-object specific
* fields.
*/
#define PATHOBJ(pathPtr) ((FsPath *) (TclFetchInternalRep((pathPtr), &fsPathType)->twoPtrValue.ptr1))
#define SETPATHOBJ(pathPtr,fsPathPtr) \
do { \
Tcl_ObjInternalRep ir; \
ir.twoPtrValue.ptr1 = (void *) (fsPathPtr); \
ir.twoPtrValue.ptr2 = NULL; \
Tcl_StoreInternalRep((pathPtr), &fsPathType, &ir); \
} while (0)
#define PATHFLAGS(pathPtr) (PATHOBJ(pathPtr)->flags)
/*
*---------------------------------------------------------------------------
*
* TclFSNormalizeAbsolutePath --
*
* Takes an absolute path specification and computes a 'normalized' path
* from it.
*
* A normalized path is one which has all '../', './' removed. Also it is
* one which is in the 'standard' format for the native platform. On
* Unix, this means the path must be free of symbolic links/aliases, and
* on Windows it means we want the long form, with that long form's
* case-dependence (which gives us a unique, case-dependent path).
*
* The behaviour of this function if passed a non-absolute path is NOT
* defined.
*
* pathPtr may have a refCount of zero, or may be a shared object.
*
* Results:
* The result is returned in a Tcl_Obj with a refCount already
* incremented, which gives the caller ownership of it. The caller must
* arrange for Tcl_DecRefCount to be called when the object is no-longer
* needed.
*
* Side effects:
* None (beyond the memory allocation for the result).
*
* Special note:
* Originally based on code from Matt Newman and Jean-Claude Wippler.
* Totally rewritten later by Vince Darley to handle symbolic links.
*
*---------------------------------------------------------------------------
*/
Tcl_Obj *
TclFSNormalizeAbsolutePath(
Tcl_Interp *interp, /* Interpreter to use */
Tcl_Obj *pathPtr) /* Absolute path to normalize */
{
const char *dirSep, *oldDirSep;
int first = 1; /* Set to zero once we've passed the first
* directory separator - we can't use '..' to
* remove the volume in a path. */
Tcl_Obj *retVal = NULL;
dirSep = TclGetString(pathPtr);
if (tclPlatform == TCL_PLATFORM_WINDOWS) {
if ( (dirSep[0] == '/' || dirSep[0] == '\\')
&& (dirSep[1] == '/' || dirSep[1] == '\\')
&& (dirSep[2] == '?')
&& (dirSep[3] == '/' || dirSep[3] == '\\')) {
/* NT extended path */
dirSep += 4;
if ( (dirSep[0] == 'U' || dirSep[0] == 'u')
&& (dirSep[1] == 'N' || dirSep[1] == 'n')
&& (dirSep[2] == 'C' || dirSep[2] == 'c')
&& (dirSep[3] == '/' || dirSep[3] == '\\')) {
/* NT extended UNC path */
dirSep += 4;
}
}
if (dirSep[0] != 0 && dirSep[1] == ':' &&
(dirSep[2] == '/' || dirSep[2] == '\\')) {
/* Do nothing */
} else if ((dirSep[0] == '/' || dirSep[0] == '\\')
&& (dirSep[1] == '/' || dirSep[1] == '\\')) {
/*
* UNC style path, where we must skip over the first separator,
* since the first two segments are actually inseparable.
*/
dirSep += 2;
dirSep += FindSplitPos(dirSep, '/');
if (*dirSep != 0) {
dirSep++;
}
}
}
/*
* Scan forward from one directory separator to the next, checking for
* '..' and '.' sequences which must be handled specially. In particular
* handling of '..' can be complicated if the directory before is a link,
* since we will have to expand the link to be able to back up one level.
*/
while (*dirSep != 0) {
oldDirSep = dirSep;
if (!first) {
dirSep++;
}
dirSep += FindSplitPos(dirSep, '/');
if (dirSep[0] == 0 || dirSep[1] == 0) {
if (retVal != NULL) {
Tcl_AppendToObj(retVal, oldDirSep, dirSep - oldDirSep);
}
break;
}
if (dirSep[1] == '.') {
if (retVal != NULL) {
Tcl_AppendToObj(retVal, oldDirSep, dirSep - oldDirSep);
oldDirSep = dirSep;
}
again:
if (IsSeparatorOrNull(dirSep[2])) {
/*
* Need to skip '.' in the path.
*/
int curLen;
if (retVal == NULL) {
const char *path = TclGetString(pathPtr);
retVal = Tcl_NewStringObj(path, dirSep - path);
Tcl_IncrRefCount(retVal);
}
TclGetStringFromObj(retVal, &curLen);
if (curLen == 0) {
Tcl_AppendToObj(retVal, dirSep, 1);
}
dirSep += 2;
oldDirSep = dirSep;
if (dirSep[0] != 0 && dirSep[1] == '.') {
goto again;
}
continue;
}
if (dirSep[2] == '.' && IsSeparatorOrNull(dirSep[3])) {
Tcl_Obj *linkObj;
int curLen;
char *linkStr;
/*
* Have '..' so need to skip previous directory.
*/
if (retVal == NULL) {
const char *path = TclGetString(pathPtr);
retVal = Tcl_NewStringObj(path, dirSep - path);
Tcl_IncrRefCount(retVal);
}
TclGetStringFromObj(retVal, &curLen);
if (curLen == 0) {
Tcl_AppendToObj(retVal, dirSep, 1);
}
if (!first || (tclPlatform == TCL_PLATFORM_UNIX)) {
linkObj = Tcl_FSLink(retVal, NULL, 0);
/* Safety check in case driver caused sharing */
if (Tcl_IsShared(retVal)) {
TclDecrRefCount(retVal);
retVal = Tcl_DuplicateObj(retVal);
Tcl_IncrRefCount(retVal);
}
if (linkObj != NULL) {
/*
* Got a link. Need to check if the link is relative
* or absolute, for those platforms where relative
* links exist.
*/
if (tclPlatform != TCL_PLATFORM_WINDOWS
&& Tcl_FSGetPathType(linkObj)
== TCL_PATH_RELATIVE) {
/*
* We need to follow this link which is relative
* to retVal's directory. This means concatenating
* the link onto the directory of the path so far.
*/
const char *path =
TclGetStringFromObj(retVal, &curLen);
while (--curLen >= 0) {
if (IsSeparatorOrNull(path[curLen])) {
break;
}
}
/*
* We want the trailing slash.
*/
Tcl_SetObjLength(retVal, curLen+1);
Tcl_AppendObjToObj(retVal, linkObj);
TclDecrRefCount(linkObj);
linkStr = TclGetStringFromObj(retVal, &curLen);
} else {
/*
* Absolute link.
*/
TclDecrRefCount(retVal);
if (Tcl_IsShared(linkObj)) {
retVal = Tcl_DuplicateObj(linkObj);
TclDecrRefCount(linkObj);
} else {
retVal = linkObj;
}
linkStr = TclGetStringFromObj(retVal, &curLen);
/*
* Convert to forward-slashes on windows.
*/
if (tclPlatform == TCL_PLATFORM_WINDOWS) {
int i;
for (i = 0; i < curLen; i++) {
if (linkStr[i] == '\\') {
linkStr[i] = '/';
}
}
}
}
} else {
linkStr = TclGetStringFromObj(retVal, &curLen);
}
/*
* Either way, we now remove the last path element (but
* not the first character of the path).
*/
while (--curLen >= 0) {
if (IsSeparatorOrNull(linkStr[curLen])) {
if (curLen) {
Tcl_SetObjLength(retVal, curLen);
} else {
Tcl_SetObjLength(retVal, 1);
}
break;
}
}
}
dirSep += 3;
oldDirSep = dirSep;
if ((curLen == 0) && (dirSep[0] != 0)) {
Tcl_SetObjLength(retVal, 0);
}
if (dirSep[0] != 0 && dirSep[1] == '.') {
goto again;
}
continue;
}
}
first = 0;
if (retVal != NULL) {
Tcl_AppendToObj(retVal, oldDirSep, dirSep - oldDirSep);
}
}
/*
* If we didn't make any changes, just use the input path.
*/
if (retVal == NULL) {
retVal = pathPtr;
Tcl_IncrRefCount(retVal);
if (Tcl_IsShared(retVal)) {
/*
* Unfortunately, the platform-specific normalization code which
* will be called below has no way of dealing with the case where
* an object is shared. It is expecting to modify an object in
* place. So, we must duplicate this here to ensure an object with
* a single ref-count.
*
* If that changes in the future (e.g. the normalize proc is given
* one object and is able to return a different one), then we
* could remove this code.
*/
TclDecrRefCount(retVal);
retVal = Tcl_DuplicateObj(pathPtr);
Tcl_IncrRefCount(retVal);
}
}
/*
* Ensure a windows drive like C:/ has a trailing separator.
*/
if (tclPlatform == TCL_PLATFORM_WINDOWS) {
int len;
const char *path = TclGetStringFromObj(retVal, &len);
if (len == 2 && path[0] != 0 && path[1] == ':') {
if (Tcl_IsShared(retVal)) {
TclDecrRefCount(retVal);
retVal = Tcl_DuplicateObj(retVal);
Tcl_IncrRefCount(retVal);
}
Tcl_AppendToObj(retVal, "/", 1);
}
}
/*
* Now we have an absolute path, with no '..', '.' sequences, but it still
* may not be in 'unique' form, depending on the platform. For instance,
* Unix is case-sensitive, so the path is ok. Windows is case-insensitive,
* and also has the weird 'longname/shortname' thing (e.g. C:/Program
* Files/ and C:/Progra~1/ are equivalent).
*
* Virtual file systems which may be registered may have other criteria
* for normalizing a path.
*/
TclFSNormalizeToUniquePath(interp, retVal, 0);
/*
* Since we know it is a normalized path, we can actually convert this
* object into an FsPath for greater efficiency
*/
MakePathFromNormalized(interp, retVal);
/*
* This has a refCount of 1 for the caller, unlike many Tcl_Obj APIs.
*/
return retVal;
}
/*
*----------------------------------------------------------------------
*
* Tcl_FSGetPathType --
*
* Determines whether a given path is relative to the current directory,
* relative to the current volume, or absolute.
*
* Results:
* Returns one of TCL_PATH_ABSOLUTE, TCL_PATH_RELATIVE, or
* TCL_PATH_VOLUME_RELATIVE.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
Tcl_PathType
Tcl_FSGetPathType(
Tcl_Obj *pathPtr)
{
return TclFSGetPathType(pathPtr, NULL, NULL);
}
/*
*----------------------------------------------------------------------
*
* TclFSGetPathType --
*
* Determines whether a given path is relative to the current directory,
* relative to the current volume, or absolute. If the caller wishes to
* know which filesystem claimed the path (in the case for which the path
* is absolute), then a reference to a filesystem pointer can be passed
* in (but passing NULL is acceptable).
*
* Results:
* Returns one of TCL_PATH_ABSOLUTE, TCL_PATH_RELATIVE, or
* TCL_PATH_VOLUME_RELATIVE. The filesystem reference will be set if and
* only if it is non-NULL and the function's return value is
* TCL_PATH_ABSOLUTE.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
Tcl_PathType
TclFSGetPathType(
Tcl_Obj *pathPtr,
const Tcl_Filesystem **filesystemPtrPtr,
int *driveNameLengthPtr)
{
FsPath *fsPathPtr;
if (Tcl_FSConvertToPathType(NULL, pathPtr) != TCL_OK) {
return TclGetPathType(pathPtr, filesystemPtrPtr, driveNameLengthPtr,
NULL);
}
fsPathPtr = PATHOBJ(pathPtr);
if (fsPathPtr->cwdPtr == NULL) {
return TclGetPathType(pathPtr, filesystemPtrPtr, driveNameLengthPtr,
NULL);
}
if (PATHFLAGS(pathPtr) == 0) {
/* The path is not absolute... */
#ifdef _WIN32
/* ... on Windows we must make another call to determine whether
* it's relative or volumerelative [Bug 2571597]. */
return TclGetPathType(pathPtr, filesystemPtrPtr, driveNameLengthPtr,
NULL);
#else
/* On other systems, quickly deduce !absolute -> relative */
return TCL_PATH_RELATIVE;
#endif
}
return TclFSGetPathType(fsPathPtr->cwdPtr, filesystemPtrPtr,
driveNameLengthPtr);
}
/*
*---------------------------------------------------------------------------
*
* TclPathPart
*
* This function calculates the requested part of the given path, which
* can be:
*
* - the directory above ('file dirname')
* - the tail ('file tail')
* - the extension ('file extension')
* - the root ('file root')
*
* The 'portion' parameter dictates which of these to calculate. There
* are a number of special cases both to be more efficient, and because
* the behaviour when given a path with only a single element is defined
* to require the expansion of that single element, where possible.
*
* Should look into integrating 'FileBasename' in tclFCmd.c into this
* function.
*
* 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 *
TclPathPart(
Tcl_Interp *interp, /* Used for error reporting */
Tcl_Obj *pathPtr, /* Path to take dirname of */
Tcl_PathPart portion) /* Requested portion of name */
{
if (TclHasInternalRep(pathPtr, &fsPathType)) {
FsPath *fsPathPtr = PATHOBJ(pathPtr);
if (PATHFLAGS(pathPtr) != 0) {
switch (portion) {
case TCL_PATH_DIRNAME: {
/*
* Check if the joined-on bit has any directory delimiters in
* it. If so, the 'dirname' would be a joining of the main
* part with the dirname of the joined-on bit. We could handle
* that special case here, but we don't, and instead just use
* the standardPath code.
*/
int numBytes;
const char *rest =
TclGetStringFromObj(fsPathPtr->normPathPtr, &numBytes);
if (strchr(rest, '/') != NULL) {
goto standardPath;
}
/*
* If the joined-on bit is empty, then [file dirname] is
* documented to return all but the last non-empty element
* of the path, so we need to split apart the main part to
* get the right answer. We could do that here, but it's
* simpler to fall back to the standardPath code.
* [Bug 2710920]
*/
if (numBytes == 0) {
goto standardPath;
}
if (tclPlatform == TCL_PLATFORM_WINDOWS
&& strchr(rest, '\\') != NULL) {
goto standardPath;
}
/*
* The joined-on path is simple, so we can just return here.
*/
Tcl_IncrRefCount(fsPathPtr->cwdPtr);
return fsPathPtr->cwdPtr;
}
case TCL_PATH_TAIL: {
/*
* Check if the joined-on bit has any directory delimiters in
* it. If so, the 'tail' would be only the part following the
* last delimiter. We could handle that special case here, but
* we don't, and instead just use the standardPath code.
*/
int numBytes;
const char *rest =
TclGetStringFromObj(fsPathPtr->normPathPtr, &numBytes);
if (strchr(rest, '/') != NULL) {
goto standardPath;
}
/*
* If the joined-on bit is empty, then [file tail] is
* documented to return the last non-empty element
* of the path, so we need to split off the last element
* of the main part to get the right answer. We could do
* that here, but it's simpler to fall back to the
* standardPath code. [Bug 2710920]
*/
if (numBytes == 0) {
goto standardPath;
}
if (tclPlatform == TCL_PLATFORM_WINDOWS
&& strchr(rest, '\\') != NULL) {
goto standardPath;
}
Tcl_IncrRefCount(fsPathPtr->normPathPtr);
return fsPathPtr->normPathPtr;
}
case TCL_PATH_EXTENSION:
return GetExtension(fsPathPtr->normPathPtr);
case TCL_PATH_ROOT: {
const char *fileName, *extension;
int length;
fileName = TclGetStringFromObj(fsPathPtr->normPathPtr,
&length);
extension = TclGetExtension(fileName);
if (extension == NULL) {
/*
* There is no extension so the root is the same as the
* path we were given.
*/
Tcl_IncrRefCount(pathPtr);
return pathPtr;
} else {
/*
* Need to return the whole path with the extension
* suffix removed. Do that by joining our "head" to
* our "tail" with the extension suffix removed from
* the tail.
*/
Tcl_Obj *resultPtr =
TclNewFSPathObj(fsPathPtr->cwdPtr, fileName,
(int)(length - strlen(extension)));
Tcl_IncrRefCount(resultPtr);
return resultPtr;
}
}
default:
/* We should never get here */
Tcl_Panic("Bad portion to TclPathPart");
/* For less clever compilers */
return NULL;
}
} else if (fsPathPtr->cwdPtr != NULL) {
/* Relative path */
goto standardPath;
} else {
/* Absolute path */
goto standardPath;
}
} else {
int splitElements;
Tcl_Obj *splitPtr, *resultPtr;
standardPath:
resultPtr = NULL;
if (portion == TCL_PATH_EXTENSION) {
return GetExtension(pathPtr);
} else if (portion == TCL_PATH_ROOT) {
int length;
const char *fileName, *extension;
fileName = TclGetStringFromObj(pathPtr, &length);
extension = TclGetExtension(fileName);
if (extension == NULL) {
Tcl_IncrRefCount(pathPtr);
return pathPtr;
} else {
Tcl_Obj *root = Tcl_NewStringObj(fileName,
(int) (length - strlen(extension)));
Tcl_IncrRefCount(root);
return root;
}
}
/*
* Tcl_FSSplitPath in the handling of home directories;
* Tcl_FSSplitPath preserves the "~", but this code computes the
* actual full path name, if we had just a single component.
*/
splitPtr = Tcl_FSSplitPath(pathPtr, &splitElements);
Tcl_IncrRefCount(splitPtr);
if (splitElements == 1 && TclGetString(pathPtr)[0] == '~') {
Tcl_Obj *norm;
TclDecrRefCount(splitPtr);
norm = Tcl_FSGetNormalizedPath(interp, pathPtr);
if (norm == NULL) {
return NULL;
}
splitPtr = Tcl_FSSplitPath(norm, &splitElements);
Tcl_IncrRefCount(splitPtr);
}
if (portion == TCL_PATH_TAIL) {
/*
* Return the last component, unless it is the only component, and
* it is the root of an absolute path.
*/
if ((splitElements > 0) && ((splitElements > 1) ||
(Tcl_FSGetPathType(pathPtr) == TCL_PATH_RELATIVE))) {
Tcl_ListObjIndex(NULL, splitPtr, splitElements-1, &resultPtr);
} else {
TclNewObj(resultPtr);
}
} else {
/*
* 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) {
resultPtr = Tcl_FSJoinPath(splitPtr, splitElements - 1);
} else if (splitElements == 0 ||
(Tcl_FSGetPathType(pathPtr) == TCL_PATH_RELATIVE)) {
TclNewLiteralStringObj(resultPtr, ".");
} else {
Tcl_ListObjIndex(NULL, splitPtr, 0, &resultPtr);
}
}
Tcl_IncrRefCount(resultPtr);
TclDecrRefCount(splitPtr);
return resultPtr;
}
}
/*
* Simple helper function
*/
static Tcl_Obj *
GetExtension(
Tcl_Obj *pathPtr)
{
const char *tail, *extension;
Tcl_Obj *ret;
tail = TclGetString(pathPtr);
extension = TclGetExtension(tail);
if (extension == NULL) {
TclNewObj(ret);
} else {
ret = Tcl_NewStringObj(extension, -1);
}
Tcl_IncrRefCount(ret);
return ret;
}
/*
*---------------------------------------------------------------------------
*
* Tcl_FSJoinPath --
*
* This function takes the given Tcl_Obj, which should be a valid list,
* and returns the path object given by considering the first 'elements'
* elements as valid path segments (each path segment may be a complete
* path, a partial path or just a single possible directory or file
* name). If any path segment is actually an absolute path, then all
* prior path segments are discarded.
*
* If elements < 0, we use the entire list that was given.
*
* It is possible that the returned object is actually an element of the
* given list, so the caller should be careful to store a refCount to it
* before freeing the list.
*
* Results:
* Returns object with refCount of zero, (or if non-zero, it has
* references elsewhere in Tcl). Either way, the caller must increment
* its refCount before use. Note that in the case where the caller has
* asked to join zero elements of the list, the return value will be an
* empty-string Tcl_Obj.
*
* If the given listObj was invalid, then the calling routine has a bug,
* and this function will just return NULL.
*
* Side effects:
* None.
*
*---------------------------------------------------------------------------
*/
Tcl_Obj *
Tcl_FSJoinPath(
Tcl_Obj *listObj, /* Path elements to join, may have a zero
* reference count. */
int elements) /* Number of elements to use (-1 = all) */
{
Tcl_Obj *res;
int objc;
Tcl_Obj **objv;
if (TclListObjLengthM(NULL, listObj, &objc) != TCL_OK) {
return NULL;
}
elements = ((elements >= 0) && (elements <= objc)) ? elements : objc;
TclListObjGetElementsM(NULL, listObj, &objc, &objv);
res = TclJoinPath(elements, objv, 0);
return res;
}
Tcl_Obj *
TclJoinPath(
int elements, /* Number of elements to use (-1 = all) */
Tcl_Obj * const objv[], /* Path elements to join */
int forceRelative) /* If non-zero, assume all more paths are
* relative (e. g. simple normalization) */
{
Tcl_Obj *res = NULL;
int i;
const Tcl_Filesystem *fsPtr = NULL;
assert ( elements >= 0 );
if (elements == 0) {
TclNewObj(res);
return res;
}
assert ( elements > 0 );
if (elements == 2) {
Tcl_Obj *elt = objv[0];
Tcl_ObjInternalRep *eltIr = TclFetchInternalRep(elt, &fsPathType);
/*
* This is a special case where we can be much more efficient, where
* we are joining a single relative path onto an object that is
* already of path type. The 'TclNewFSPathObj' call below creates an
* object which can be normalized more efficiently. Currently we only
* use the special case when we have exactly two elements, but we
* could expand that in the future.
*
* Bugfix [a47641a0]. TclNewFSPathObj requires first argument
* to be an absolute path. Added a check to ensure that elt is absolute.
*/
if ((eltIr)
&& !((elt->bytes != NULL) && (elt->bytes[0] == '\0'))
&& TclGetPathType(elt, NULL, NULL, NULL) == TCL_PATH_ABSOLUTE) {
Tcl_Obj *tailObj = objv[1];
Tcl_PathType type;
/* if forceRelative - second path is relative */
type = forceRelative ? TCL_PATH_RELATIVE :
TclGetPathType(tailObj, NULL, NULL, NULL);
if (type == TCL_PATH_RELATIVE) {
const char *str;
int len;
str = TclGetStringFromObj(tailObj, &len);
if (len == 0) {
/*
* This happens if we try to handle the root volume '/'.
* There's no need to return a special path object, when
* the base itself is just fine!
*/
return elt;
}
/*
* If it doesn't begin with '.' and is a unix path or it a
* windows path without backslashes, then we can be very
* efficient here. (In fact even a windows path with
* backslashes can be joined efficiently, but the path object
* would not have forward slashes only, and this would
* therefore contradict our 'file join' documentation).
*/
if (str[0] != '.' && ((tclPlatform != TCL_PLATFORM_WINDOWS)
|| (strchr(str, '\\') == NULL))) {
/*
* Finally, on Windows, 'file join' is defined to convert
* all backslashes to forward slashes, so the base part
* cannot have backslashes either.
*/
if ((tclPlatform != TCL_PLATFORM_WINDOWS)
|| (strchr(Tcl_GetString(elt), '\\') == NULL)) {
if (PATHFLAGS(elt)) {
return TclNewFSPathObj(elt, str, len);
}
if (TCL_PATH_ABSOLUTE != Tcl_FSGetPathType(elt)) {
return TclNewFSPathObj(elt, str, len);
}
(void) Tcl_FSGetNormalizedPath(NULL, elt);
if (elt == PATHOBJ(elt)->normPathPtr) {
return TclNewFSPathObj(elt, str, len);
}
}
}
/*
* Otherwise we don't have an easy join, and we must let the
* more general code below handle things.
*/
} else if (tclPlatform == TCL_PLATFORM_UNIX) {
return tailObj;
} else {
const char *str = TclGetString(tailObj);
if (tclPlatform == TCL_PLATFORM_WINDOWS) {
if (strchr(str, '\\') == NULL) {
return tailObj;
}
}
}
}
}
assert ( res == NULL );
for (i = 0; i < elements; i++) {
int driveNameLength, strEltLen, length;
Tcl_PathType type;
char *strElt, *ptr;
Tcl_Obj *driveName = NULL;
Tcl_Obj *elt = objv[i];
strElt = TclGetStringFromObj(elt, &strEltLen);
driveNameLength = 0;
/* if forceRelative - all paths excepting first one are relative */
type = (forceRelative && (i > 0)) ? TCL_PATH_RELATIVE :
TclGetPathType(elt, &fsPtr, &driveNameLength, &driveName);
if (type != TCL_PATH_RELATIVE) {
/*
* Zero out the current result.
*/
if (res != NULL) {
TclDecrRefCount(res);
}
if (driveName != NULL) {
/*
* We've been given a separate drive-name object, because the
* prefix in 'elt' is not in a suitable format for us (e.g. it
* may contain irrelevant multiple separators, like
* C://///foo).
*/
res = Tcl_DuplicateObj(driveName);
TclDecrRefCount(driveName);
/*
* Do not set driveName to NULL, because we will check its
* value below (but we won't access the contents, since those
* have been cleaned-up).
*/
} else {
res = Tcl_NewStringObj(strElt, driveNameLength);
}
strElt += driveNameLength;
} else if (driveName != NULL) {
Tcl_DecrRefCount(driveName);
}
/*
* Optimisation block: if this is the last element to be examined, and
* it is absolute or the only element, and the drive-prefix was ok (if
* there is one), it might be that the path is already in a suitable
* form to be returned. Then we can short-cut the rest of this
* function.
*/
if ((driveName == NULL) && (i == (elements - 1))
&& (type != TCL_PATH_RELATIVE || res == NULL)) {
/*
* It's the last path segment. Perform a quick check if the path
* is already in a suitable form.
*/
if (tclPlatform == TCL_PLATFORM_WINDOWS) {
if (strchr(strElt, '\\') != NULL) {
goto noQuickReturn;
}
}
ptr = strElt;
/* [Bug f34cf83dd0] */
if (driveNameLength > 0) {
if (ptr[0] == '/' && ptr[-1] == '/') {
goto noQuickReturn;
}
}
while (*ptr != '\0') {
if (*ptr == '/' && (ptr[1] == '/' || ptr[1] == '\0')) {
/*
* We have a repeated file separator, which means the path
* is not in normalized form
*/
goto noQuickReturn;
}
ptr++;
}
if (res != NULL) {
TclDecrRefCount(res);
}
/*
* This element is just what we want to return already; no further
* manipulation is requred.
*/
return elt;
}
/*
* The path element was not of a suitable form to be returned as is.
* We need to perform a more complex operation here.
*/
noQuickReturn:
if (res == NULL) {
TclNewObj(res);
}
ptr = TclGetStringFromObj(res, &length);
/*
* Strip off any './' before a tilde, unless this is the beginning of
* the path.
*/
if (length > 0 && strEltLen > 0 && (strElt[0] == '.') &&
(strElt[1] == '/') && (strElt[2] == '~')) {
strElt += 2;
}
/*
* A NULL value for fsPtr at this stage basically means we're trying
* to join a relative path onto something which is also relative (or
* empty). There's nothing particularly wrong with that.
*/
if (*strElt == '\0') {
continue;
}
if (fsPtr == &tclNativeFilesystem || fsPtr == NULL) {
TclpNativeJoinPath(res, strElt);
} else {
char separator = '/';
int needsSep = 0;
if (fsPtr->filesystemSeparatorProc != NULL) {
Tcl_Obj *sep = fsPtr->filesystemSeparatorProc(res);
if (sep != NULL) {
separator = TclGetString(sep)[0];
TclDecrRefCount(sep);
}
/* Safety check in case the VFS driver caused sharing */
if (Tcl_IsShared(res)) {
TclDecrRefCount(res);
res = Tcl_DuplicateObj(res);
Tcl_IncrRefCount(res);
}
}
if (length > 0 && ptr[length -1] != '/') {
Tcl_AppendToObj(res, &separator, 1);
TclGetStringFromObj(res, &length);
}
Tcl_SetObjLength(res, length + (int) strlen(strElt));
ptr = TclGetString(res) + length;
for (; *strElt != '\0'; strElt++) {
if (*strElt == separator) {
while (strElt[1] == separator) {
strElt++;
}
if (strElt[1] != '\0') {
if (needsSep) {
*ptr++ = separator;
}
}
} else {
*ptr++ = *strElt;
needsSep = 1;
}
}
length = ptr - TclGetString(res);
Tcl_SetObjLength(res, length);
}
}
assert ( res != NULL );
return res;
}
/*
*---------------------------------------------------------------------------
*
* Tcl_FSConvertToPathType --
*
* This function tries to convert the given Tcl_Obj to a valid Tcl path
* type, taking account of the fact that the cwd may have changed even if
* this object is already supposedly of the correct type.
*
* The filename may begin with "~" (to indicate current user's home
* directory) or "~<user>" (to indicate any user's home directory).
*
* Results:
* Standard Tcl error code.
*
* Side effects:
* The old representation may be freed, and new memory allocated.
*
*---------------------------------------------------------------------------
*/
int
Tcl_FSConvertToPathType(
Tcl_Interp *interp, /* Interpreter in which to store error message
* (if necessary). */
Tcl_Obj *pathPtr) /* Object to convert to a valid, current path
* type. */
{
/*
* While it is bad practice to examine an object's type directly, this is
* actually the best thing to do here. The reason is that if we are
* converting this object to FsPath type for the first time, we don't need
* to worry whether the 'cwd' has changed. On the other hand, if this
* object is already of FsPath type, and is a relative path, we do have to
* worry about the cwd. If the cwd has changed, we must recompute the
* path.
*/
if (TclHasInternalRep(pathPtr, &fsPathType)) {
if (TclFSEpochOk(PATHOBJ(pathPtr)->filesystemEpoch)) {
return TCL_OK;
}
TclGetString(pathPtr);
Tcl_StoreInternalRep(pathPtr, &fsPathType, NULL);
}
return SetFsPathFromAny(interp, pathPtr);
}
/*
* Helper function for normalization.
*/
static int
IsSeparatorOrNull(
int ch)
{
if (ch == 0) {
return 1;
}
switch (tclPlatform) {
case TCL_PLATFORM_UNIX:
return (ch == '/' ? 1 : 0);
case TCL_PLATFORM_WINDOWS:
return ((ch == '/' || ch == '\\') ? 1 : 0);
}
return 0;
}
/*
* Helper function for SetFsPathFromAny. Returns position of first directory
* delimiter in the path. If no separator is found, then returns the position
* of the end of the string.
*/
static int
FindSplitPos(
const char *path,
int separator)
{
int count = 0;
switch (tclPlatform) {
case TCL_PLATFORM_UNIX:
while (path[count] != 0) {
if (path[count] == separator) {
return count;
}
count++;
}
break;
case TCL_PLATFORM_WINDOWS:
while (path[count] != 0) {
if (path[count] == separator || path[count] == '\\') {
return count;
}
count++;
}
break;
}
return count;
}
/*
*---------------------------------------------------------------------------
*
* TclNewFSPathObj --
*
* Creates a path object whose string representation is '[file join
* dirPtr addStrRep]', but does so in a way that allows for more
* efficient creation and caching of normalized paths, and more efficient
* 'file dirname', 'file tail', etc.
*
* Assumptions:
* 'dirPtr' must be an absolute path. 'len' may not be zero.
*
* Results:
* The new Tcl object, with refCount zero.
*
* Side effects:
* Memory is allocated. 'dirPtr' gets an additional refCount.
*
*---------------------------------------------------------------------------
*/
Tcl_Obj *
TclNewFSPathObj(
Tcl_Obj *dirPtr,
const char *addStrRep,
int len)
{
FsPath *fsPathPtr;
Tcl_Obj *pathPtr;
const char *p;
int state = 0, count = 0;
/* [Bug 2806250] - this is only a partial solution of the problem.
* The PATHFLAGS != 0 representation assumes in many places that
* the "tail" part stored in the normPathPtr field is itself a
* relative path. Strings that begin with "~" are not relative paths,
* so we must prevent their storage in the normPathPtr field.
*
* More generally we ought to be testing "addStrRep" for any value
* that is not a relative path, but in an unconstrained VFS world
* that could be just about anything, and testing could be expensive.
* Since this routine plays a big role in [glob], anything that slows
* it down would be unwelcome. For now, continue the risk of further
* bugs when some Tcl_Filesystem uses otherwise relative path strings
* as absolute path strings. Sensible Tcl_Filesystems will avoid
* that by mounting on path prefixes like foo:// which cannot be the
* name of a file or directory read from a native [glob] operation.
*/
if (addStrRep[0] == '~') {
Tcl_Obj *tail = Tcl_NewStringObj(addStrRep, len);
pathPtr = AppendPath(dirPtr, tail);
Tcl_DecrRefCount(tail);
return pathPtr;
}
TclNewObj(pathPtr);
fsPathPtr = (FsPath *)ckalloc(sizeof(FsPath));
/*
* Set up the path.
*/
fsPathPtr->translatedPathPtr = NULL;
fsPathPtr->normPathPtr = Tcl_NewStringObj(addStrRep, len);
Tcl_IncrRefCount(fsPathPtr->normPathPtr);
fsPathPtr->cwdPtr = dirPtr;
Tcl_IncrRefCount(dirPtr);
fsPathPtr->nativePathPtr = NULL;
fsPathPtr->fsPtr = NULL;
fsPathPtr->filesystemEpoch = 0;
SETPATHOBJ(pathPtr, fsPathPtr);
PATHFLAGS(pathPtr) = TCLPATH_APPENDED;
TclInvalidateStringRep(pathPtr);
/*
* Look for path components made up of only "."
* This is overly conservative analysis to keep simple. It may mark some
* things as needing more aggressive normalization that don't actually
* need it. No harm done.
*/
for (p = addStrRep; len > 0; p++, len--) {
switch (state) {
case 0: /* So far only "." since last dirsep or start */
switch (*p) {
case '.':
count++;
break;
case '/':
case '\\':
case ':':
if (count) {
PATHFLAGS(pathPtr) |= TCLPATH_NEEDNORM;
len = 0;
}
break;
default:
count = 0;
state = 1;
}
break;
case 1: /* Scanning for next dirsep */
switch (*p) {
case '/':
case '\\':
case ':':
state = 0;
break;
}
}
}
if (len == 0 && count) {
PATHFLAGS(pathPtr) |= TCLPATH_NEEDNORM;
}
return pathPtr;
}
static Tcl_Obj *
AppendPath(
Tcl_Obj *head,
Tcl_Obj *tail)
{
int numBytes;
const char *bytes;
Tcl_Obj *copy = Tcl_DuplicateObj(head);
/*
* This is likely buggy when dealing with virtual filesystem drivers
* that use some character other than "/" as a path separator. I know
* of no evidence that such a foolish thing exists. This solution was
* chosen so that "JoinPath" operations that pass through either path
* internalrep produce the same results; that is, bugward compatibility. If
* we need to fix that bug here, it needs fixing in TclJoinPath() too.
*/
bytes = TclGetStringFromObj(tail, &numBytes);
if (numBytes == 0) {
Tcl_AppendToObj(copy, "/", 1);
} else {
TclpNativeJoinPath(copy, bytes);
}
return copy;
}
/*
*---------------------------------------------------------------------------
*
* TclFSMakePathRelative --
*
* Only for internal use.
*
* Takes a path and a directory, where we _assume_ both path and
* directory are absolute, normalized and that the path lies inside the
* directory. Returns a Tcl_Obj representing filename of the path
* relative to the directory.
*
* Results:
* NULL on error, otherwise a valid object, typically with refCount of
* zero, which it is assumed the caller will increment.
*
* Side effects:
* The old representation may be freed, and new memory allocated.
*
*---------------------------------------------------------------------------
*/
Tcl_Obj *
TclFSMakePathRelative(
TCL_UNUSED(Tcl_Interp *),
Tcl_Obj *pathPtr, /* The path we have. */
Tcl_Obj *cwdPtr) /* Make it relative to this. */
{
int cwdLen, len;
const char *tempStr;
Tcl_ObjInternalRep *irPtr = TclFetchInternalRep(pathPtr, &fsPathType);
if (irPtr) {
FsPath *fsPathPtr = PATHOBJ(pathPtr);
if (PATHFLAGS(pathPtr) != 0 && fsPathPtr->cwdPtr == cwdPtr) {
return fsPathPtr->normPathPtr;
}
}
/*
* We know the cwd is a normalised object which does not end in a
* directory delimiter, unless the cwd is the name of a volume, in which
* case it will end in a delimiter! We handle this situation here. A
* better test than the '!= sep' might be to simply check if 'cwd' is a
* root volume.
*
* Note that if we get this wrong, we will strip off either too much or
* too little below, leading to wrong answers returned by glob.
*/
tempStr = TclGetStringFromObj(cwdPtr, &cwdLen);
/*
* Should we perhaps use 'Tcl_FSPathSeparator'? But then what about the
* Windows special case? Perhaps we should just check if cwd is a root
* volume.
*/
switch (tclPlatform) {
case TCL_PLATFORM_UNIX:
if (tempStr[cwdLen-1] != '/') {
cwdLen++;
}
break;
case TCL_PLATFORM_WINDOWS:
if (tempStr[cwdLen-1] != '/' && tempStr[cwdLen-1] != '\\') {
cwdLen++;
}
break;
}
tempStr = TclGetStringFromObj(pathPtr, &len);
return Tcl_NewStringObj(tempStr + cwdLen, len - cwdLen);
}
/*
*---------------------------------------------------------------------------
*
* MakePathFromNormalized --
*
* Like SetFsPathFromAny, but assumes the given object is an absolute
* normalized path. Only for internal use.
*
* Results:
* Standard Tcl error code.
*
* Side effects:
* The old representation may be freed, and new memory allocated.
*
*---------------------------------------------------------------------------
*/
static int
MakePathFromNormalized(
TCL_UNUSED(Tcl_Interp *),
Tcl_Obj *pathPtr) /* The object to convert. */
{
FsPath *fsPathPtr;
if (TclHasInternalRep(pathPtr, &fsPathType)) {
return TCL_OK;
}
fsPathPtr = (FsPath *)ckalloc(sizeof(FsPath));
/*
* It's a pure normalized absolute path.
*/
fsPathPtr->translatedPathPtr = NULL;
Tcl_IncrRefCount(fsPathPtr->normPathPtr = Tcl_DuplicateObj(pathPtr));
fsPathPtr->cwdPtr = NULL;
fsPathPtr->nativePathPtr = NULL;
fsPathPtr->fsPtr = NULL;
/* Remember the epoch under which we decided pathPtr was normalized */
fsPathPtr->filesystemEpoch = TclFSEpoch();
SETPATHOBJ(pathPtr, fsPathPtr);
PATHFLAGS(pathPtr) = 0;
return TCL_OK;
}
/*
*---------------------------------------------------------------------------
*
* Tcl_FSNewNativePath --
*
* Performs the something like the reverse of the usual
* obj->path->nativerep conversions. If some code retrieves a path in
* native form (from, e.g. readlink or a native dialog), and that path is
* to be used at the Tcl level, then calling this function is an
* efficient way of creating the appropriate path object type.
*
* Any memory which is allocated for 'clientData' should be retained
* until clientData is passed to the filesystem's freeInternalRepProc
* when it can be freed. The built in platform-specific filesystems use
* 'ckalloc' to allocate clientData, and ckfree to free it.
*
* Results:
* NULL or a valid path object pointer, with refCount zero.
*
* Side effects:
* New memory may be allocated.
*
*---------------------------------------------------------------------------
*/
Tcl_Obj *
Tcl_FSNewNativePath(
const Tcl_Filesystem *fromFilesystem,
ClientData clientData)
{
Tcl_Obj *pathPtr = NULL;
FsPath *fsPathPtr;
if (fromFilesystem->internalToNormalizedProc != NULL) {
pathPtr = (*fromFilesystem->internalToNormalizedProc)(clientData);
}
if (pathPtr == NULL) {
return NULL;
}
/*
* Free old representation; shouldn't normally be any, but best to be
* safe.
*/
Tcl_StoreInternalRep(pathPtr, &fsPathType, NULL);
fsPathPtr = (FsPath *)ckalloc(sizeof(FsPath));
fsPathPtr->translatedPathPtr = NULL;
Tcl_IncrRefCount(fsPathPtr->normPathPtr = Tcl_DuplicateObj(pathPtr));
fsPathPtr->cwdPtr = NULL;
fsPathPtr->nativePathPtr = clientData;
fsPathPtr->fsPtr = fromFilesystem;
fsPathPtr->filesystemEpoch = TclFSEpoch();
SETPATHOBJ(pathPtr, fsPathPtr);
PATHFLAGS(pathPtr) = 0;
return pathPtr;
}
/*
*---------------------------------------------------------------------------
*
* Tcl_FSGetTranslatedPath --
*
* Attempts to extract the translated path from the given
* Tcl_Obj. If the translation succeeds (i.e. the object is a valid
* path), then it is returned. Otherwise NULL is returned and an
* error message may be left in the interpreter if it is not NULL.
*
* Results:
* A Tcl_Obj pointer or NULL.
*
* Side effects:
* pathPtr is converted to fsPathType if necessary.
*
* FsPath members are modified as needed.
*
*---------------------------------------------------------------------------
*/
Tcl_Obj *
Tcl_FSGetTranslatedPath(
Tcl_Interp *interp,
Tcl_Obj *pathPtr)
{
Tcl_Obj *retObj = NULL;
FsPath *srcFsPathPtr;
if (Tcl_FSConvertToPathType(interp, pathPtr) != TCL_OK) {
return NULL;
}
srcFsPathPtr = PATHOBJ(pathPtr);
if (srcFsPathPtr->translatedPathPtr == NULL) {
if (PATHFLAGS(pathPtr) == 0) {
/*
* Path is already normalized
*/
retObj = srcFsPathPtr->normPathPtr;
} else {
/*
* We lack a translated path result, but we have a directory
* (cwdPtr) and a tail (normPathPtr), and if we join the
* translated version of cwdPtr to normPathPtr, we'll get the
* translated result we need, and can store it for future use.
*/
Tcl_Obj *translatedCwdPtr = Tcl_FSGetTranslatedPath(interp,
srcFsPathPtr->cwdPtr);
Tcl_ObjInternalRep *translatedCwdIrPtr;
if (translatedCwdPtr == NULL) {
return NULL;
}
retObj = Tcl_FSJoinToPath(translatedCwdPtr, 1,
&srcFsPathPtr->normPathPtr);
Tcl_IncrRefCount(srcFsPathPtr->translatedPathPtr = retObj);
translatedCwdIrPtr = TclFetchInternalRep(translatedCwdPtr, &fsPathType);
if (translatedCwdIrPtr) {
srcFsPathPtr->filesystemEpoch
= PATHOBJ(translatedCwdPtr)->filesystemEpoch;
} else {
srcFsPathPtr->filesystemEpoch = 0;
}
Tcl_DecrRefCount(translatedCwdPtr);
}
} else {
/*
* It is an ordinary path object.
*/
retObj = srcFsPathPtr->translatedPathPtr;
}
if (retObj != NULL) {
Tcl_IncrRefCount(retObj);
}
return retObj;
}
/*
*---------------------------------------------------------------------------
*
* Tcl_FSGetTranslatedStringPath --
*
* This function attempts to extract the translated path from the given
* Tcl_Obj. If the translation succeeds (i.e. the object is a valid
* path), then the path is returned. Otherwise NULL will be returned, and
* an error message may be left in the interpreter (if it is non-NULL)
*
* Results:
* NULL or a valid string.
*
* Side effects:
* Only those of 'Tcl_FSConvertToPathType'
*
*---------------------------------------------------------------------------
*/
const char *
Tcl_FSGetTranslatedStringPath(
Tcl_Interp *interp,
Tcl_Obj *pathPtr)
{
Tcl_Obj *transPtr = Tcl_FSGetTranslatedPath(interp, pathPtr);
if (transPtr != NULL) {
int len;
const char *orig = TclGetStringFromObj(transPtr, &len);
char *result = (char *)ckalloc(len+1);
memcpy(result, orig, len+1);
TclDecrRefCount(transPtr);
return result;
}
return NULL;
}
/*
*---------------------------------------------------------------------------
*
* Tcl_FSGetNormalizedPath --
*
* This important function attempts to extract from the given Tcl_Obj a
* unique normalised path representation, whose string value can be used
* as a unique identifier for the file.
*
* Results:
* NULL or a valid path object pointer.
*
* Side effects:
* New memory may be allocated. The Tcl 'errno' may be modified in the
* process of trying to examine various path possibilities.
*
*---------------------------------------------------------------------------
*/
Tcl_Obj *
Tcl_FSGetNormalizedPath(
Tcl_Interp *interp,
Tcl_Obj *pathPtr)
{
FsPath *fsPathPtr;
if (Tcl_FSConvertToPathType(interp, pathPtr) != TCL_OK) {
return NULL;
}
fsPathPtr = PATHOBJ(pathPtr);
if (PATHFLAGS(pathPtr) != 0) {
/*
* This is a special path object which is the result of something like
* 'file join'
*/
Tcl_Obj *dir, *copy;
int tailLen, cwdLen, pathType;
pathType = Tcl_FSGetPathType(fsPathPtr->cwdPtr);
dir = Tcl_FSGetNormalizedPath(interp, fsPathPtr->cwdPtr);
if (dir == NULL) {
return NULL;
}
/* TODO: Figure out why this is needed. */
TclGetString(pathPtr);
TclGetStringFromObj(fsPathPtr->normPathPtr, &tailLen);
if (tailLen) {
copy = AppendPath(dir, fsPathPtr->normPathPtr);
} else {
copy = Tcl_DuplicateObj(dir);
}
Tcl_IncrRefCount(dir);
Tcl_IncrRefCount(copy);
/*
* We now own a reference on both 'dir' and 'copy'
*/
(void) TclGetStringFromObj(dir, &cwdLen);
/* Normalize the combined string. */
if (PATHFLAGS(pathPtr) & TCLPATH_NEEDNORM) {
/*
* If the "tail" part has components (like /../) that cause the
* combined path to need more complete normalizing, call on the
* more powerful routine to accomplish that so we avoid [Bug
* 2385549] ...
*/
Tcl_Obj *newCopy = TclFSNormalizeAbsolutePath(interp, copy);
Tcl_DecrRefCount(copy);
copy = newCopy;
} else {
/*
* ... but in most cases where we join a trouble free tail to a
* normalized head, we can more efficiently normalize the combined
* path by passing over only the unnormalized tail portion. When
* this is sufficient, prior developers claim this should be much
* faster. We use 'cwdLen' so that we are already pointing at
* the dir-separator that we know about. The normalization code
* will actually start off directly after that separator.
*/
TclFSNormalizeToUniquePath(interp, copy, cwdLen);
}
/* Now we need to construct the new path object. */
if (pathType == TCL_PATH_RELATIVE) {
Tcl_Obj *origDir = fsPathPtr->cwdPtr;
/*
* NOTE: here we are (dangerously?) assuming that origDir points
* to a Tcl_Obj with Tcl_ObjType == &fsPathType. The
* pathType = Tcl_FSGetPathType(fsPathPtr->cwdPtr);
* above that set the pathType value should have established that,
* but it's far less clear on what basis we know there's been no
* shimmering since then.
*/
FsPath *origDirFsPathPtr = PATHOBJ(origDir);
fsPathPtr->cwdPtr = origDirFsPathPtr->cwdPtr;
Tcl_IncrRefCount(fsPathPtr->cwdPtr);
TclDecrRefCount(fsPathPtr->normPathPtr);
fsPathPtr->normPathPtr = copy;
TclDecrRefCount(dir);
TclDecrRefCount(origDir);
} else {
TclDecrRefCount(fsPathPtr->cwdPtr);
fsPathPtr->cwdPtr = NULL;
TclDecrRefCount(fsPathPtr->normPathPtr);
fsPathPtr->normPathPtr = copy;
TclDecrRefCount(dir);
}
PATHFLAGS(pathPtr) = 0;
}
/*
* Ensure cwd hasn't changed.
*/
if (fsPathPtr->cwdPtr != NULL) {
if (!TclFSCwdPointerEquals(&fsPathPtr->cwdPtr)) {
TclGetString(pathPtr);
Tcl_StoreInternalRep(pathPtr, &fsPathType, NULL);
if (SetFsPathFromAny(interp, pathPtr) != TCL_OK) {
return NULL;
}
fsPathPtr = PATHOBJ(pathPtr);
} else if (fsPathPtr->normPathPtr == NULL) {
int cwdLen;
Tcl_Obj *copy;
copy = AppendPath(fsPathPtr->cwdPtr, pathPtr);
(void) TclGetStringFromObj(fsPathPtr->cwdPtr, &cwdLen);
cwdLen += (Tcl_GetString(copy)[cwdLen] == '/');
/*
* Normalize the combined string, but only starting after the end
* of the previously normalized 'dir'. This should be much faster!
*/
TclFSNormalizeToUniquePath(interp, copy, cwdLen-1);
fsPathPtr->normPathPtr = copy;
Tcl_IncrRefCount(fsPathPtr->normPathPtr);
}
}
if (fsPathPtr->normPathPtr == NULL) {
Tcl_Obj *useThisCwd = NULL;
/*
* Since normPathPtr is NULL but this is a valid path object, we know
* that the translatedPathPtr cannot be NULL.
*/
Tcl_Obj *absolutePath = fsPathPtr->translatedPathPtr;
const char *path = TclGetString(absolutePath);
Tcl_IncrRefCount(absolutePath);
/*
* We have to be a little bit careful here to avoid infinite loops
* we're asking Tcl_FSGetPathType to return the path's type, but that
* call can actually result in a lot of other filesystem action, which
* might loop back through here.
*/
if (path[0] == '\0') {
/*
* Special handling for the empty string value. This one is very
* weird with [file normalize {}] => {}. (The reasoning supporting
* this is unknown to DGP, but he fears changing it.) Attempt here
* to keep the expectations of other parts of Tcl_Filesystem code
* about state of the FsPath fields satisfied.
*
* In particular, capture the cwd value and save so it can be
* stored in the cwdPtr field below.
*/
useThisCwd = Tcl_FSGetCwd(interp);
} else {
/*
* We don't ask for the type of 'pathPtr' here, because that is
* not correct for our purposes when we have a path like '~'. Tcl
* has a bit of a contradiction in that '~' paths are defined as
* 'absolute', but in reality can be just about anything,
* depending on how env(HOME) is set.
*/
Tcl_PathType type = Tcl_FSGetPathType(absolutePath);
if (type == TCL_PATH_RELATIVE) {
useThisCwd = Tcl_FSGetCwd(interp);
if (useThisCwd == NULL) {
return NULL;
}
Tcl_DecrRefCount(absolutePath);
absolutePath = Tcl_FSJoinToPath(useThisCwd, 1, &absolutePath);
Tcl_IncrRefCount(absolutePath);
/*
* We have a refCount on the cwd.
*/
#ifdef _WIN32
} else if (type == TCL_PATH_VOLUME_RELATIVE) {
/*
* Only Windows has volume-relative paths.
*/
Tcl_DecrRefCount(absolutePath);
absolutePath = TclWinVolumeRelativeNormalize(interp,
path, &useThisCwd);
if (absolutePath == NULL) {
return NULL;
}
#endif /* _WIN32 */
}
}
/*
* Already has refCount incremented.
*/
if (fsPathPtr->normPathPtr) {
Tcl_DecrRefCount(fsPathPtr->normPathPtr);
}
fsPathPtr->normPathPtr = TclFSNormalizeAbsolutePath(interp,
absolutePath);
if (useThisCwd != NULL) {
/*
* We just need to free an object we allocated above for relative
* paths (this was returned by Tcl_FSJoinToPath above), and then
* of course store the cwd.
*/
fsPathPtr->cwdPtr = useThisCwd;
}
TclDecrRefCount(absolutePath);
}
return fsPathPtr->normPathPtr;
}
/*
*---------------------------------------------------------------------------
*
* Tcl_FSGetInternalRep --
*
* Produces a native representation of a given path object in the given
* filesystem.
*
* In the future it might be desirable to have separate versions
* of this function with different signatures, for example
* Tcl_FSGetNativeWinPath, Tcl_FSGetNativeUnixPath etc. Right now, since
* native paths are all string based, we use just one function.
*
* Results:
*
* The native handle for the path, or NULL if the path is not handled by
* the given filesystem
*
* Side effects:
*
* Tcl_FSCreateInternalRepProc if needed to produce the native
* handle, which is then stored in the internal representation of pathPtr.
*
*---------------------------------------------------------------------------
*/
ClientData
Tcl_FSGetInternalRep(
Tcl_Obj *pathPtr,
const Tcl_Filesystem *fsPtr)
{
FsPath *srcFsPathPtr;
if (Tcl_FSConvertToPathType(NULL, pathPtr) != TCL_OK) {
return NULL;
}
srcFsPathPtr = PATHOBJ(pathPtr);
/*
* Currently there must be a unique bi-directional mapping between a path
* and a filesystem, and therefore there is no way to "remap" a file, i.e.,
* to map a file in one filesystem into another. Another way of putting
* this is that 'stacked' filesystems are not allowed. It could be useful
* in the future to redesign the system to allow that.
*
* Even something simple like a 'pass through' filesystem which logs all
* activity and passes the calls onto the native system would be nice, but
* not currently easily achievable.
*/
if (srcFsPathPtr->fsPtr == NULL) {
Tcl_FSGetFileSystemForPath(pathPtr);
srcFsPathPtr = PATHOBJ(pathPtr);
if (srcFsPathPtr->fsPtr == NULL) {
/*
* The path is probably not a valid path in the filesystsem, and is
* most likely to be a use of the empty path "" via a direct call
* to one of the objectified interfaces (e.g. from the Tcl
* testsuite).
*/
return NULL;
}
}
/*
* If the file belongs to a different filesystem, perhaps it is actually
* linked through to a file in the given filesystem. Check this by
* inspecting the filesystem associated with the given path.
*/
if (fsPtr != srcFsPathPtr->fsPtr) {
const Tcl_Filesystem *actualFs = Tcl_FSGetFileSystemForPath(pathPtr);
if (actualFs == fsPtr) {
return Tcl_FSGetInternalRep(pathPtr, fsPtr);
}
return NULL;
}
if (srcFsPathPtr->nativePathPtr == NULL) {
Tcl_FSCreateInternalRepProc *proc;
char *nativePathPtr;
proc = srcFsPathPtr->fsPtr->createInternalRepProc;
if (proc == NULL) {
return NULL;
}
nativePathPtr = (char *)proc(pathPtr);
srcFsPathPtr = PATHOBJ(pathPtr);
srcFsPathPtr->nativePathPtr = nativePathPtr;
srcFsPathPtr->filesystemEpoch = TclFSEpoch();
}
return srcFsPathPtr->nativePathPtr;
}
/*
*---------------------------------------------------------------------------
*
* TclFSEnsureEpochOk --
*
* Ensure that the path is a valid path, and that it has a
* fsPathType internal representation that is not stale.
*
* Results:
* A standard Tcl return code.
*
* Side effects:
* The internal representation of fsPtrPtr is converted to fsPathType if
* possible.
*
*---------------------------------------------------------------------------
*/
int
TclFSEnsureEpochOk(
Tcl_Obj *pathPtr,
const Tcl_Filesystem **fsPtrPtr)
{
FsPath *srcFsPathPtr;
if (!TclHasInternalRep(pathPtr, &fsPathType)) {
return TCL_OK;
}
srcFsPathPtr = PATHOBJ(pathPtr);
if (!TclFSEpochOk(srcFsPathPtr->filesystemEpoch)) {
/*
* The filesystem has changed in some way since the internal
* representation for this object was calculated. Discard the stale
* representation and recalculate it.
*/
TclGetString(pathPtr);
Tcl_StoreInternalRep(pathPtr, &fsPathType, NULL);
if (SetFsPathFromAny(NULL, pathPtr) != TCL_OK) {
return TCL_ERROR;
}
srcFsPathPtr = PATHOBJ(pathPtr);
}
if (srcFsPathPtr->fsPtr != NULL) {
/*
* There is already a filesystem assigned to this path.
*/
*fsPtrPtr = srcFsPathPtr->fsPtr;
}
return TCL_OK;
}
/*
*---------------------------------------------------------------------------
*
* TclFSSetPathDetails --
*
* ???
*
* Results:
* None
*
* Side effects:
* ???
*
*---------------------------------------------------------------------------
*/
void
TclFSSetPathDetails(
Tcl_Obj *pathPtr,
const Tcl_Filesystem *fsPtr,
ClientData clientData)
{
FsPath *srcFsPathPtr;
/*
* Make sure pathPtr is of the correct type.
*/
if (!TclHasInternalRep(pathPtr, &fsPathType)) {
if (SetFsPathFromAny(NULL, pathPtr) != TCL_OK) {
return;
}
}
srcFsPathPtr = PATHOBJ(pathPtr);
srcFsPathPtr->fsPtr = fsPtr;
srcFsPathPtr->nativePathPtr = clientData;
srcFsPathPtr->filesystemEpoch = TclFSEpoch();
}
/*
*---------------------------------------------------------------------------
*
* Tcl_FSEqualPaths --
*
* This function tests whether the two paths given are equal path
* objects. If either or both is NULL, 0 is always returned.
*
* Results:
* 1 or 0.
*
* Side effects:
* None.
*
*---------------------------------------------------------------------------
*/
int
Tcl_FSEqualPaths(
Tcl_Obj *firstPtr,
Tcl_Obj *secondPtr)
{
const char *firstStr, *secondStr;
int firstLen, secondLen, tempErrno;
if (firstPtr == secondPtr) {
return 1;
}
if (firstPtr == NULL || secondPtr == NULL) {
return 0;
}
firstStr = TclGetStringFromObj(firstPtr, &firstLen);
secondStr = TclGetStringFromObj(secondPtr, &secondLen);
if ((firstLen == secondLen) && !memcmp(firstStr, secondStr, firstLen)) {
return 1;
}
/*
* Try the most thorough, correct method of comparing fully normalized
* paths.
*/
tempErrno = Tcl_GetErrno();
firstPtr = Tcl_FSGetNormalizedPath(NULL, firstPtr);
secondPtr = Tcl_FSGetNormalizedPath(NULL, secondPtr);
Tcl_SetErrno(tempErrno);
if (firstPtr == NULL || secondPtr == NULL) {
return 0;
}
firstStr = TclGetStringFromObj(firstPtr, &firstLen);
secondStr = TclGetStringFromObj(secondPtr, &secondLen);
return ((firstLen == secondLen) && !memcmp(firstStr, secondStr, firstLen));
}
/*
*---------------------------------------------------------------------------
*
* SetFsPathFromAny --
*
* Attempt to convert the internal representation of pathPtr to
* fsPathType.
*
* A tilde ("~") character at the beginnig of the filename indicates the
* current user's home directory, and "~<user>" indicates a particular
* user's directory.
*
* Results:
* Standard Tcl error code.
*
* Side effects:
* The old representation may be freed, and new memory allocated.
*
*---------------------------------------------------------------------------
*/
static int
SetFsPathFromAny(
Tcl_Interp *interp, /* Used for error reporting if not NULL. */
Tcl_Obj *pathPtr) /* The object to convert. */
{
int len;
FsPath *fsPathPtr;
Tcl_Obj *transPtr;
const char *name;
if (TclHasInternalRep(pathPtr, &fsPathType)) {
return TCL_OK;
}
/*
* First step is to translate the filename. This is similar to
* Tcl_TranslateFilename, but shouldn't convert everything to windows
* backslashes on that platform. The current implementation of this piece
* is a slightly optimised version of the various Tilde/Split/Join stuff
* to avoid multiple split/join operations.
*
* We remove any trailing directory separator.
*
* However, the split/join routines are quite complex, and one has to make
* sure not to break anything on Unix or Win (fCmd.test, fileName.test and
* cmdAH.test exercise most of the code).
*/
name = TclGetStringFromObj(pathPtr, &len);
/*
* Handle tilde substitutions, if needed.
*/
if (len && name[0] == '~') {
Tcl_DString temp;
int split;
char separator = '/';
/*
* We have multiple cases '~/foo/bar...', '~user/foo/bar...', etc.
* split becomes value 1 for '~/...' as well as for '~'.
*/
split = FindSplitPos(name, separator);
/*
* Do some tilde substitution.
*/
if (split == 1) {
/*
* We have just '~' (or '~/...')
*/
const char *dir;
Tcl_DString dirString;
dir = TclGetEnv("HOME", &dirString);
if (dir == NULL) {
if (interp) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"couldn't find HOME environment variable to"
" expand path", -1));
Tcl_SetErrorCode(interp, "TCL", "VALUE", "PATH",
"HOMELESS", NULL);
}
return TCL_ERROR;
}
Tcl_DStringInit(&temp);
Tcl_JoinPath(1, &dir, &temp);
Tcl_DStringFree(&dirString);
} else {
/*
* There is a '~user'
*/
const char *expandedUser;
Tcl_DString userName;
Tcl_DStringInit(&userName);
Tcl_DStringAppend(&userName, name+1, split-1);
expandedUser = Tcl_DStringValue(&userName);
Tcl_DStringInit(&temp);
if (TclpGetUserHome(expandedUser, &temp) == NULL) {
if (interp != NULL) {
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"user \"%s\" doesn't exist", expandedUser));
Tcl_SetErrorCode(interp, "TCL", "VALUE", "PATH", "NOUSER",
NULL);
}
Tcl_DStringFree(&userName);
Tcl_DStringFree(&temp);
return TCL_ERROR;
}
Tcl_DStringFree(&userName);
}
transPtr = Tcl_DStringToObj(&temp);
if (split != len) {
/*
* Join up the tilde substitution with the rest.
*/
if (name[split+1] == separator) {
/*
* Somewhat tricky case like ~//foo/bar. Make use of
* Split/Join machinery to get it right. Assumes all paths
* beginning with ~ are part of the native filesystem.
*/
int objc;
Tcl_Obj **objv;
Tcl_Obj *parts = TclpNativeSplitPath(pathPtr, NULL);
TclListObjGetElementsM(NULL, parts, &objc, &objv);
/*
* Skip '~'. It's replaced by its expansion.
*/
objc--; objv++;
while (objc--) {
TclpNativeJoinPath(transPtr, Tcl_GetString(*objv++));
}
TclDecrRefCount(parts);
} else {
Tcl_Obj *pair[2];
pair[0] = transPtr;
pair[1] = Tcl_NewStringObj(name+split+1, -1);
transPtr = TclJoinPath(2, pair, 1);
if (transPtr != pair[0]) {
Tcl_DecrRefCount(pair[0]);
}
if (transPtr != pair[1]) {
Tcl_DecrRefCount(pair[1]);
}
}
}
} else {
transPtr = TclJoinPath(1, &pathPtr, 1);
}
/*
* Now we have a translated filename in 'transPtr'. This will have forward
* slashes on Windows, and will not contain any ~user sequences.
*/
fsPathPtr = (FsPath *)ckalloc(sizeof(FsPath));
if (transPtr == pathPtr) {
transPtr = Tcl_DuplicateObj(pathPtr);
fsPathPtr->filesystemEpoch = 0;
} else {
fsPathPtr->filesystemEpoch = TclFSEpoch();
}
Tcl_IncrRefCount(transPtr);
fsPathPtr->translatedPathPtr = transPtr;
fsPathPtr->normPathPtr = NULL;
fsPathPtr->cwdPtr = NULL;
fsPathPtr->nativePathPtr = NULL;
fsPathPtr->fsPtr = NULL;
SETPATHOBJ(pathPtr, fsPathPtr);
PATHFLAGS(pathPtr) = 0;
return TCL_OK;
}
static void
FreeFsPathInternalRep(
Tcl_Obj *pathPtr) /* Path object with internal rep to free. */
{
FsPath *fsPathPtr = PATHOBJ(pathPtr);
if (fsPathPtr->translatedPathPtr != NULL) {
if (fsPathPtr->translatedPathPtr != pathPtr) {
TclDecrRefCount(fsPathPtr->translatedPathPtr);
}
}
if (fsPathPtr->normPathPtr != NULL) {
if (fsPathPtr->normPathPtr != pathPtr) {
TclDecrRefCount(fsPathPtr->normPathPtr);
}
fsPathPtr->normPathPtr = NULL;
}
if (fsPathPtr->cwdPtr != NULL) {
TclDecrRefCount(fsPathPtr->cwdPtr);
fsPathPtr->cwdPtr = NULL;
}
if (fsPathPtr->nativePathPtr != NULL && fsPathPtr->fsPtr != NULL) {
Tcl_FSFreeInternalRepProc *freeProc =
fsPathPtr->fsPtr->freeInternalRepProc;
if (freeProc != NULL) {
freeProc(fsPathPtr->nativePathPtr);
fsPathPtr->nativePathPtr = NULL;
}
}
ckfree(fsPathPtr);
}
static void
DupFsPathInternalRep(
Tcl_Obj *srcPtr, /* Path obj with internal rep to copy. */
Tcl_Obj *copyPtr) /* Path obj with internal rep to set. */
{
FsPath *srcFsPathPtr = PATHOBJ(srcPtr);
FsPath *copyFsPathPtr = (FsPath *)ckalloc(sizeof(FsPath));
SETPATHOBJ(copyPtr, copyFsPathPtr);
copyFsPathPtr->translatedPathPtr = srcFsPathPtr->translatedPathPtr;
if (copyFsPathPtr->translatedPathPtr != NULL) {
Tcl_IncrRefCount(copyFsPathPtr->translatedPathPtr);
}
copyFsPathPtr->normPathPtr = srcFsPathPtr->normPathPtr;
if (copyFsPathPtr->normPathPtr != NULL) {
Tcl_IncrRefCount(copyFsPathPtr->normPathPtr);
}
copyFsPathPtr->cwdPtr = srcFsPathPtr->cwdPtr;
if (copyFsPathPtr->cwdPtr != NULL) {
Tcl_IncrRefCount(copyFsPathPtr->cwdPtr);
}
copyFsPathPtr->flags = srcFsPathPtr->flags;
if (srcFsPathPtr->fsPtr != NULL
&& srcFsPathPtr->nativePathPtr != NULL) {
Tcl_FSDupInternalRepProc *dupProc =
srcFsPathPtr->fsPtr->dupInternalRepProc;
if (dupProc != NULL) {
copyFsPathPtr->nativePathPtr =
dupProc(srcFsPathPtr->nativePathPtr);
} else {
copyFsPathPtr->nativePathPtr = NULL;
}
} else {
copyFsPathPtr->nativePathPtr = NULL;
}
copyFsPathPtr->fsPtr = srcFsPathPtr->fsPtr;
copyFsPathPtr->filesystemEpoch = srcFsPathPtr->filesystemEpoch;
}
/*
*---------------------------------------------------------------------------
*
* UpdateStringOfFsPath --
*
* Gives an object a valid string rep.
*
* Results:
* None.
*
* Side effects:
* Memory may be allocated.
*
*---------------------------------------------------------------------------
*/
static void
UpdateStringOfFsPath(
Tcl_Obj *pathPtr) /* path obj with string rep to update. */
{
FsPath *fsPathPtr = PATHOBJ(pathPtr);
int cwdLen;
Tcl_Obj *copy;
if (PATHFLAGS(pathPtr) == 0 || fsPathPtr->cwdPtr == NULL) {
Tcl_Panic("Called UpdateStringOfFsPath with invalid object");
}
copy = AppendPath(fsPathPtr->cwdPtr, fsPathPtr->normPathPtr);
if (Tcl_IsShared(copy)) {
copy = Tcl_DuplicateObj(copy);
}
Tcl_IncrRefCount(copy);
/* Steal copy's string rep */
pathPtr->bytes = TclGetStringFromObj(copy, &cwdLen);
pathPtr->length = cwdLen;
TclInitStringRep(copy, NULL, 0);
TclDecrRefCount(copy);
}
/*
*---------------------------------------------------------------------------
*
* TclNativePathInFilesystem --
*
* Any path object is acceptable to the native filesystem, by default (we
* will throw errors when illegal paths are actually tried to be used).
*
* However, this behavior means the native filesystem must be the last
* filesystem in the lookup list (otherwise it will claim all files
* belong to it, and other filesystems will never get a look in).
*
* Results:
* TCL_OK, to indicate 'yes', -1 to indicate no.
*
* Side effects:
* None.
*
*---------------------------------------------------------------------------
*/
int
TclNativePathInFilesystem(
Tcl_Obj *pathPtr,
TCL_UNUSED(ClientData *))
{
/*
* A special case is required to handle the empty path "". This is a valid
* path (i.e. the user should be able to do 'file exists ""' without
* throwing an error), but equally the path doesn't exist. Those are the
* semantics of Tcl (at present anyway), so we have to abide by them here.
*/
if (TclHasInternalRep(pathPtr, &fsPathType)) {
if (pathPtr->bytes != NULL && pathPtr->bytes[0] == '\0') {
/*
* We reject the empty path "".
*/
return -1;
}
/*
* Otherwise there is no way this path can be empty.
*/
} else {
/*
* It is somewhat unusual to reach this code path without the object
* being of fsPathType. However, we do our best to deal with the
* situation.
*/
int len;
(void) TclGetStringFromObj(pathPtr, &len);
if (len == 0) {
/*
* We reject the empty path "".
*/
return -1;
}
}
/*
* Path is of correct type, or is of non-zero length, so we accept it.
*/
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* MakeTildeRelativePath --
*
* Returns a path relative to the home directory of a user.
* Note there is a difference between not specifying a user and
* explicitly specifying the current user. This mimics Tcl8's tilde
* expansion.
*
* The subPath argument is joined to the expanded home directory
* as in Tcl_JoinPath. This means if it is not relative, it will
* returned as the result with the home directory only checked
* for user name validity.
*
* Results:
* Returns TCL_OK on success with home directory path in *dsPtr
* and TCL_ERROR on failure with error message in interp if non-NULL.
*
*----------------------------------------------------------------------
*/
int
MakeTildeRelativePath(
Tcl_Interp *interp, /* May be NULL. Only used for error messages */
const char *user, /* User name. NULL -> current user */
const char *subPath, /* Rest of path. May be NULL */
Tcl_DString *dsPtr) /* Output. Is initialized by the function. Must be
freed on success */
{
const char *dir;
Tcl_DString dirString;
Tcl_DStringInit(dsPtr);
Tcl_DStringInit(&dirString);
if (user == NULL || user[0] == 0) {
/* No user name specified -> current user */
dir = TclGetEnv("HOME", &dirString);
if (dir == NULL) {
if (interp) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"couldn't find HOME environment variable to"
" expand path", -1));
Tcl_SetErrorCode(interp, "TCL", "VALUE", "PATH",
"HOMELESS", NULL);
}
return TCL_ERROR;
}
} else {
/* User name specified - ~user */
dir = TclpGetUserHome(user, &dirString);
if (dir == NULL) {
if (interp != NULL) {
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"user \"%s\" doesn't exist", user));
Tcl_SetErrorCode(interp, "TCL", "VALUE", "PATH", "NOUSER",
NULL);
}
return TCL_ERROR;
}
}
if (subPath) {
const char *parts[2];
parts[0] = dir;
parts[1] = subPath;
Tcl_JoinPath(2, parts, dsPtr);
} else {
Tcl_JoinPath(1, &dir, dsPtr);
}
Tcl_DStringFree(&dirString);
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* TclGetHomeDirObj --
*
* Wrapper around MakeTildeRelativePath. See that function.
*
* Results:
* Returns a Tcl_Obj containing the home directory of a user
* or NULL on failure with error message in interp if non-NULL.
*
*----------------------------------------------------------------------
*/
Tcl_Obj *
TclGetHomeDirObj(
Tcl_Interp *interp, /* May be NULL. Only used for error messages */
const char *user) /* User name. NULL -> current user */
{
Tcl_DString dirString;
if (MakeTildeRelativePath(interp, user, NULL, &dirString) != TCL_OK) {
return NULL;
}
return Tcl_DStringToObj(&dirString);
}
/*
*----------------------------------------------------------------------
*
* TclResolveTildePath --
*
* If the passed path is begins with a tilde, does tilde resolution
* and returns a Tcl_Obj containing the resolved path. If the tilde
* component cannot be resolved, returns NULL. If the path does not
* begin with a tilde, returns as is.
*
* Results:
* Returns a Tcl_Obj with resolved path. This may be a new Tcl_Obj
* with ref count 0 or that pathObj that was passed in without its
* ref count modified.
* Returns NULL if the path begins with a ~ that cannot be resolved
* and stores an error message in interp if non-NULL.
*
*----------------------------------------------------------------------
*/
Tcl_Obj *
TclResolveTildePath(
Tcl_Interp *interp, /* May be NULL. Only used for error messages */
Tcl_Obj *pathObj)
{
const char *path;
int len;
int split;
Tcl_DString resolvedPath;
path = Tcl_GetStringFromObj(pathObj, &len);
if (path[0] != '~') {
return pathObj;
}
/*
* We have multiple cases '~/foo/bar...', '~user/foo/bar...', etc.
* split becomes value 1 for '~/...' as well as for '~'. Note on
* Windows FindSplitPos will implicitly check for '\' as separator
* in addition to what is passed.
*/
split = FindSplitPos(path, '/');
if (split == 1) {
/* No user name specified -> current user */
if (MakeTildeRelativePath(
interp, NULL, path[1] ? 2 + path : NULL, &resolvedPath)
!= TCL_OK) {
return NULL;
}
} else {
/* User name specified - ~user */
const char *expandedUser;
Tcl_DString userName;
Tcl_DStringInit(&userName);
Tcl_DStringAppend(&userName, path+1, split-1);
expandedUser = Tcl_DStringValue(&userName);
/* path[split] is / or \0 */
if (MakeTildeRelativePath(interp,
expandedUser,
path[split] ? &path[split+1] : NULL,
&resolvedPath)
!= TCL_OK) {
Tcl_DStringFree(&userName);
return NULL;
}
Tcl_DStringFree(&userName);
}
return Tcl_DStringToObj(&resolvedPath);
}
/*
*----------------------------------------------------------------------
*
* TclResolveTildePathList --
*
* Given a Tcl_Obj that is a list of paths, returns a Tcl_Obj containing
* the paths with any ~-prefixed paths resolved.
*
* Empty strings and ~-prefixed paths that cannot be resolved are
* removed from the returned list.
*
* The trailing components of the path are returned verbatim. No
* processing is done on them. Moreover, no assumptions should be
* made about the separators in the returned path. They may be /
* or native. Appropriate path manipulations functions should be
* used by caller if desired.
*
* Results:
* Returns a Tcl_Obj with resolved paths. This may be a new Tcl_Obj with
* reference count 0 or the original passed-in Tcl_Obj if no paths needed
* resolution. A NULL is returned if the passed in value is not a list
* or was NULL.
*
*----------------------------------------------------------------------
*/
Tcl_Obj *
TclResolveTildePathList(
Tcl_Obj *pathsObj)
{
Tcl_Obj **objv;
int objc;
int i;
Tcl_Obj *resolvedPaths;
const char *path;
if (pathsObj == NULL) {
return NULL;
}
if (Tcl_ListObjGetElements(NULL, pathsObj, &objc, &objv) != TCL_OK) {
return NULL; /* Not a list */
}
/*
* Figure out if any paths need resolving to avoid unnecessary allocations.
*/
for (i = 0; i < objc; ++i) {
path = Tcl_GetString(objv[i]);
if (path[0] == '~') {
break; /* At least one path needs resolution */
}
}
if (i == objc) {
return pathsObj; /* No paths needed to be resolved */
}
resolvedPaths = Tcl_NewListObj(objc, NULL);
for (i = 0; i < objc; ++i) {
Tcl_Obj *resolvedPath;
path = Tcl_GetString(objv[i]);
if (path[0] == 0) {
continue; /* Skip empty strings */
}
resolvedPath = TclResolveTildePath(NULL, objv[i]);
if (resolvedPath) {
/* Paths that cannot be resolved are skipped */
Tcl_ListObjAppendElement(NULL, resolvedPaths, resolvedPath);
}
}
return resolvedPaths;
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
