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Diffstat (limited to 'generic/tclPathObj.c')
| -rw-r--r-- | generic/tclPathObj.c | 2693 |
1 files changed, 2693 insertions, 0 deletions
diff --git a/generic/tclPathObj.c b/generic/tclPathObj.c new file mode 100644 index 0000000..0053041 --- /dev/null +++ b/generic/tclPathObj.c @@ -0,0 +1,2693 @@ +/* + * 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 (c) 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" + +/* + * 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 tclFsPathType = { + "path", /* name */ + FreeFsPathInternalRep, /* freeIntRepProc */ + DupFsPathInternalRep, /* dupIntRepProc */ + UpdateStringOfFsPath, /* updateStringProc */ + SetFsPathFromAny /* setFromAnyProc */ +}; + +/* + * struct FsPath -- + * + * Internal representation of a Tcl_Obj of "path" type. This can be used to + * represent relative or absolute paths, and has certain optimisations when + * used to represent paths which are already normalized and absolute. + * + * Note that both 'translatedPathPtr' and 'normPathPtr' can be a circular + * reference to the container Tcl_Obj of this FsPath. + * + * There are two cases, with the first being the most common: + * + * (i) flags == 0, => Ordinary path. + * + * translatedPathPtr contains the translated path (which may be a circular + * reference to the object itself). If it is NULL then the path is pure + * normalized (and the normPathPtr will be a circular reference). cwdPtr is + * null for an absolute path, and non-null for a relative path (unless the cwd + * has never been set, in which case the cwdPtr may also be null for a + * relative path). + * + * (ii) flags != 0, => Special path, see TclNewFSPathObj + * + * Now, this is a path like 'file join $dir $tail' where, cwdPtr is the $dir + * and normPathPtr is the $tail. + * + */ + +typedef struct FsPath { + Tcl_Obj *translatedPathPtr; /* Name without any ~user sequences. If this + * is NULL, then this is a pure normalized, + * absolute path object, in which the parent + * Tcl_Obj's string rep is already both + * translated and normalized. */ + Tcl_Obj *normPathPtr; /* Normalized absolute path, without ., .. or + * ~user sequences. If the Tcl_Obj containing + * this FsPath is already normalized, this may + * be a circular reference back to the + * container. If that is NOT the case, we have + * a refCount on the object. */ + Tcl_Obj *cwdPtr; /* If null, path is absolute, else this points + * to the cwd object used for this path. We + * have a refCount on the object. */ + 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 *) (pathPtr)->internalRep.twoPtrValue.ptr1) +#define SETPATHOBJ(pathPtr,fsPathPtr) \ + ((pathPtr)->internalRep.twoPtrValue.ptr1 = (void *) (fsPathPtr)) +#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 of 1, which is + * therefore owned by the caller. It must be freed (with + * Tcl_DecrRefCount) by the caller when no longer needed. + * + * Side effects: + * None (beyond the memory allocation for the result). + * + * Special note: + * This code was originally based on code from Matt Newman and + * Jean-Claude Wippler, but has since been totally rewritten by Vince + * Darley to deal with 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 (pathPtr->typePtr == &tclFsPathType) { + 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; + } + } + + /* + * The behaviour we want here is slightly different to the standard + * Tcl_FSSplitPath in the handling of home directories; + * Tcl_FSSplitPath preserves the "~" while this code computes the + * actual full path name, if we had just a single component. + */ + + splitPtr = Tcl_FSSplitPath(pathPtr, &splitElements); + 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 { + resultPtr = Tcl_NewObj(); + } + } 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) { + ret = Tcl_NewObj(); + } 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 *copy, *res; + int objc; + Tcl_Obj **objv; + + if (Tcl_ListObjLength(NULL, listObj, &objc) != TCL_OK) { + return NULL; + } + + elements = ((elements >= 0) && (elements <= objc)) ? elements : objc; + copy = TclListObjCopy(NULL, listObj); + Tcl_ListObjGetElements(NULL, listObj, &objc, &objv); + res = TclJoinPath(elements, objv); + Tcl_DecrRefCount(copy); + return res; +} + +Tcl_Obj * +TclJoinPath( + int elements, + Tcl_Obj * const objv[]) +{ + Tcl_Obj *res; + int i; + const Tcl_Filesystem *fsPtr = NULL; + + 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]; + + /* + * 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 for that elt is absolute. + */ + + if ((i == (elements-2)) && (i == 0) + && (elt->typePtr == &tclFsPathType) + && !((elt->bytes != NULL) && (elt->bytes[0] == '\0')) + && TclGetPathType(elt, NULL, NULL, NULL) == TCL_PATH_ABSOLUTE) { + Tcl_Obj *tailObj = objv[i+1]; + + type = 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! + */ + + if (res != NULL) { + TclDecrRefCount(res); + } + 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 (res != NULL) { + TclDecrRefCount(res); + } + 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) { + if (res != NULL) { + TclDecrRefCount(res); + } + return tailObj; + } else { + const char *str = TclGetString(tailObj); + + if (tclPlatform == TCL_PLATFORM_WINDOWS) { + if (strchr(str, '\\') == NULL) { + if (res != NULL) { + TclDecrRefCount(res); + } + return tailObj; + } + } + } + } + strElt = TclGetStringFromObj(elt, &strEltLen); + type = 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; + 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) { + res = Tcl_NewObj(); + ptr = TclGetStringFromObj(res, &length); + } else { + 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]; + } + /* 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); + } + } + if (res == NULL) { + res = Tcl_NewObj(); + } + 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 (pathPtr->typePtr == &tclFsPathType) { + if (TclFSEpochOk(PATHOBJ(pathPtr)->filesystemEpoch)) { + return TCL_OK; + } + + if (pathPtr->bytes == NULL) { + UpdateStringOfFsPath(pathPtr); + } + FreeFsPathInternalRep(pathPtr); + } + + return SetFsPathFromAny(interp, pathPtr); + + /* + * We used to have more complex code here: + * + * FsPath *fsPathPtr = PATHOBJ(pathPtr); + * if (fsPathPtr->cwdPtr == NULL || PATHFLAGS(pathPtr) != 0) { + * return TCL_OK; + * } else { + * if (TclFSCwdPointerEquals(&fsPathPtr->cwdPtr)) { + * return TCL_OK; + * } else { + * if (pathPtr->bytes == NULL) { + * UpdateStringOfFsPath(pathPtr); + * } + * FreeFsPathInternalRep(pathPtr); + * return Tcl_ConvertToType(interp, pathPtr, &tclFsPathType); + * } + * } + * + * But we no longer believe this is necessary. + */ +} + +/* + * 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; + } + + pathPtr = Tcl_NewObj(); + fsPathPtr = 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; + pathPtr->typePtr = &tclFsPathType; + pathPtr->bytes = NULL; + pathPtr->length = 0; + + /* + * 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; + } + 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 + * intrep 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_Interp *interp, /* Used for error reporting if not NULL. */ + Tcl_Obj *pathPtr, /* The path we have. */ + Tcl_Obj *cwdPtr) /* Make it relative to this. */ +{ + int cwdLen, len; + const char *tempStr; + + if (pathPtr->typePtr == &tclFsPathType) { + 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_Interp *interp, /* Used for error reporting if not NULL. */ + Tcl_Obj *pathPtr) /* The object to convert. */ +{ + FsPath *fsPathPtr; + + if (pathPtr->typePtr == &tclFsPathType) { + return TCL_OK; + } + + /* + * Free old representation + */ + + if (pathPtr->typePtr != NULL) { + if (pathPtr->bytes == NULL) { + if (pathPtr->typePtr->updateStringProc == NULL) { + if (interp != NULL) { + Tcl_SetObjResult(interp, Tcl_NewStringObj( + "can't find object string representation", -1)); + Tcl_SetErrorCode(interp, "TCL", "VALUE", "PATH", "WTF", + NULL); + } + return TCL_ERROR; + } + pathPtr->typePtr->updateStringProc(pathPtr); + } + TclFreeIntRep(pathPtr); + } + + fsPathPtr = ckalloc(sizeof(FsPath)); + + /* + * It's a pure normalized absolute path. + */ + + fsPathPtr->translatedPathPtr = NULL; + + /* + * Circular reference by design. + */ + + fsPathPtr->normPathPtr = 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; + pathPtr->typePtr = &tclFsPathType; + + return TCL_OK; +} + +/* + *--------------------------------------------------------------------------- + * + * Tcl_FSNewNativePath -- + * + * This function 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. + */ + + if (pathPtr->typePtr != NULL) { + if (pathPtr->bytes == NULL) { + if (pathPtr->typePtr->updateStringProc == NULL) { + return NULL; + } + pathPtr->typePtr->updateStringProc(pathPtr); + } + TclFreeIntRep(pathPtr); + } + + fsPathPtr = ckalloc(sizeof(FsPath)); + + fsPathPtr->translatedPathPtr = NULL; + + /* + * Circular reference, by design. + */ + + fsPathPtr->normPathPtr = pathPtr; + fsPathPtr->cwdPtr = NULL; + fsPathPtr->nativePathPtr = clientData; + fsPathPtr->fsPtr = fromFilesystem; + fsPathPtr->filesystemEpoch = TclFSEpoch(); + + SETPATHOBJ(pathPtr, fsPathPtr); + PATHFLAGS(pathPtr) = 0; + pathPtr->typePtr = &tclFsPathType; + + return pathPtr; +} + +/* + *--------------------------------------------------------------------------- + * + * Tcl_FSGetTranslatedPath -- + * + * 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 it 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 Tcl_Obj pointer. + * + * Side effects: + * Only those of 'Tcl_FSConvertToPathType' + * + *--------------------------------------------------------------------------- + */ + +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) { + /* + * 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); + if (translatedCwdPtr == NULL) { + return NULL; + } + + retObj = Tcl_FSJoinToPath(translatedCwdPtr, 1, + &srcFsPathPtr->normPathPtr); + srcFsPathPtr->translatedPathPtr = retObj; + if (translatedCwdPtr->typePtr == &tclFsPathType) { + srcFsPathPtr->filesystemEpoch + = PATHOBJ(translatedCwdPtr)->filesystemEpoch; + } else { + srcFsPathPtr->filesystemEpoch = 0; + } + Tcl_IncrRefCount(retObj); + Tcl_DecrRefCount(translatedCwdPtr); + } else { + /* + * It is a pure absolute, normalized path object. This is + * something like being a 'pure list'. The object's string, + * translatedPath and normalizedPath are all identical. + */ + + retObj = srcFsPathPtr->normPathPtr; + } + } 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 = ckalloc(len+1); + + memcpy(result, orig, (size_t) 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. */ + if (pathPtr->bytes == NULL) { + UpdateStringOfFsPath(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); + cwdLen += (Tcl_GetString(copy)[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-1' 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-1); + } + + /* 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 == &tclFsPathType. 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; + + /* + * That's our reference to copy used. + */ + + TclDecrRefCount(dir); + TclDecrRefCount(origDir); + } else { + TclDecrRefCount(fsPathPtr->cwdPtr); + fsPathPtr->cwdPtr = NULL; + TclDecrRefCount(fsPathPtr->normPathPtr); + fsPathPtr->normPathPtr = copy; + + /* + * That's our reference to copy used. + */ + + TclDecrRefCount(dir); + } + PATHFLAGS(pathPtr) = 0; + } + + /* + * Ensure cwd hasn't changed. + */ + + if (fsPathPtr->cwdPtr != NULL) { + if (!TclFSCwdPointerEquals(&fsPathPtr->cwdPtr)) { + if (pathPtr->bytes == NULL) { + UpdateStringOfFsPath(pathPtr); + } + FreeFsPathInternalRep(pathPtr); + 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; + int pureNormalized = 1; + + /* + * 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; + } + + pureNormalized = 0; + 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; + } + pureNormalized = 0; +#endif /* _WIN32 */ + } + } + + /* + * Already has refCount incremented. + */ + + fsPathPtr->normPathPtr = TclFSNormalizeAbsolutePath(interp, + absolutePath); + + /* + * Check if path is pure normalized (this can only be the case if it + * is an absolute path). + */ + + if (pureNormalized) { + int normPathLen, pathLen; + const char *normPath; + + path = TclGetStringFromObj(pathPtr, &pathLen); + normPath = TclGetStringFromObj(fsPathPtr->normPathPtr, &normPathLen); + if ((pathLen == normPathLen) && !memcmp(path, normPath, pathLen)) { + /* + * The path was already normalized. Get rid of the duplicate. + */ + + TclDecrRefCount(fsPathPtr->normPathPtr); + + /* + * We do *not* increment the refCount for this circular + * reference. + */ + + fsPathPtr->normPathPtr = pathPtr; + } + } + 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 -- + * + * Extract the internal representation of a given path object, in the + * given filesystem. If the path object belongs to a different + * filesystem, we return NULL. + * + * If the internal representation is currently NULL, we attempt to + * generate it, by calling the filesystem's + * 'Tcl_FSCreateInternalRepProc'. + * + * Results: + * NULL or a valid internal representation. + * + * Side effects: + * An attempt may be made to convert the object. + * + *--------------------------------------------------------------------------- + */ + +ClientData +Tcl_FSGetInternalRep( + Tcl_Obj *pathPtr, + const Tcl_Filesystem *fsPtr) +{ + FsPath *srcFsPathPtr; + + if (Tcl_FSConvertToPathType(NULL, pathPtr) != TCL_OK) { + return NULL; + } + srcFsPathPtr = PATHOBJ(pathPtr); + + /* + * We will only return the native representation for the caller's + * filesystem. Otherwise we will simply return NULL. This means that there + * must be a unique bi-directional mapping between paths and filesystems, + * and that this mapping will not allow 'remapped' files -- files which + * are in one filesystem but mapped into another. Another way of putting + * this is that 'stacked' filesystems are not allowed. We recognise that + * this is a potentially useful feature for the future. + * + * 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 easily achievable with the current implementation. + */ + + if (srcFsPathPtr->fsPtr == NULL) { + /* + * This only usually happens in wrappers like TclpStat which create a + * string object and pass it to TclpObjStat. Code which calls the + * Tcl_FS.. functions should always have a filesystem already set. + * Whether this code path is legal or not depends on whether we decide + * to allow external code to call the native filesystem directly. It + * is at least safer to allow this sub-optimal routing. + */ + + Tcl_FSGetFileSystemForPath(pathPtr); + + /* + * If we fail through here, then 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). + */ + + srcFsPathPtr = PATHOBJ(pathPtr); + if (srcFsPathPtr->fsPtr == NULL) { + return NULL; + } + } + + /* + * There is still one possibility we should consider; if the file belongs + * to a different filesystem, perhaps it is actually linked through to a + * file in our own filesystem which we do care about. The way we can check + * for this is we ask what filesystem this path belongs to. + */ + + 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 = proc(pathPtr); + srcFsPathPtr = PATHOBJ(pathPtr); + srcFsPathPtr->nativePathPtr = nativePathPtr; + } + + return srcFsPathPtr->nativePathPtr; +} + +/* + *--------------------------------------------------------------------------- + * + * TclFSEnsureEpochOk -- + * + * This will ensure the pathPtr is up to date and can be converted into a + * "path" type, and that we are able to generate a complete normalized + * path which is used to determine the filesystem match. + * + * Results: + * Standard Tcl return code. + * + * Side effects: + * An attempt may be made to convert the object. + * + *--------------------------------------------------------------------------- + */ + +int +TclFSEnsureEpochOk( + Tcl_Obj *pathPtr, + const Tcl_Filesystem **fsPtrPtr) +{ + FsPath *srcFsPathPtr; + + if (pathPtr->typePtr != &tclFsPathType) { + return TCL_OK; + } + + srcFsPathPtr = PATHOBJ(pathPtr); + + /* + * Check if the filesystem has changed in some way since this object's + * internal representation was calculated. + */ + + if (!TclFSEpochOk(srcFsPathPtr->filesystemEpoch)) { + /* + * We have to discard the stale representation and recalculate it. + */ + + if (pathPtr->bytes == NULL) { + UpdateStringOfFsPath(pathPtr); + } + FreeFsPathInternalRep(pathPtr); + if (SetFsPathFromAny(NULL, pathPtr) != TCL_OK) { + return TCL_ERROR; + } + srcFsPathPtr = PATHOBJ(pathPtr); + } + + /* + * Check whether the object is already assigned to a fs. + */ + + if (srcFsPathPtr->fsPtr != NULL) { + *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 (pathPtr->typePtr != &tclFsPathType) { + 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 -- + * + * This function tries to convert the given Tcl_Obj to a valid Tcl path + * 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. + * + *--------------------------------------------------------------------------- + */ + +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; + char *name; + + if (pathPtr->typePtr == &tclFsPathType) { + 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 (name[0] == '~') { + Tcl_DString temp; + int split; + char separator = '/'; + + split = FindSplitPos(name, separator); + if (split != len) { + /* + * We have multiple pieces '~user/foo/bar...' + */ + + name[split] = '\0'; + } + + /* + * Do some tilde substitution. + */ + + if (name[1] == '\0') { + /* + * We have just '~' + */ + + const char *dir; + Tcl_DString dirString; + + if (split != len) { + name[split] = separator; + } + + 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 { + /* + * We have a user name '~user' + */ + + Tcl_DStringInit(&temp); + if (TclpGetUserHome(name+1, &temp) == NULL) { + if (interp != NULL) { + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "user \"%s\" doesn't exist", name+1)); + Tcl_SetErrorCode(interp, "TCL", "VALUE", "PATH", "NOUSER", + NULL); + } + Tcl_DStringFree(&temp); + if (split != len) { + name[split] = separator; + } + return TCL_ERROR; + } + if (split != len) { + name[split] = separator; + } + } + + transPtr = TclDStringToObj(&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); + + Tcl_ListObjGetElements(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); + Tcl_DecrRefCount(pair[0]); + Tcl_DecrRefCount(pair[1]); + } + } + } else { + transPtr = TclJoinPath(1, &pathPtr); + } + + /* + * Now we have a translated filename in 'transPtr'. This will have forward + * slashes on Windows, and will not contain any ~user sequences. + */ + + fsPathPtr = ckalloc(sizeof(FsPath)); + + fsPathPtr->translatedPathPtr = transPtr; + if (transPtr != pathPtr) { + Tcl_IncrRefCount(fsPathPtr->translatedPathPtr); + /* Redo translation when $env(HOME) changes */ + fsPathPtr->filesystemEpoch = TclFSEpoch(); + } else { + fsPathPtr->filesystemEpoch = 0; + } + fsPathPtr->normPathPtr = NULL; + fsPathPtr->cwdPtr = NULL; + fsPathPtr->nativePathPtr = NULL; + fsPathPtr->fsPtr = NULL; + + /* + * Free old representation before installing our new one. + */ + + TclFreeIntRep(pathPtr); + SETPATHOBJ(pathPtr, fsPathPtr); + PATHFLAGS(pathPtr) = 0; + pathPtr->typePtr = &tclFsPathType; + 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); + } + if (fsPathPtr->nativePathPtr != NULL && fsPathPtr->fsPtr != NULL) { + Tcl_FSFreeInternalRepProc *freeProc = + fsPathPtr->fsPtr->freeInternalRepProc; + + if (freeProc != NULL) { + freeProc(fsPathPtr->nativePathPtr); + fsPathPtr->nativePathPtr = NULL; + } + } + + ckfree(fsPathPtr); + pathPtr->typePtr = NULL; +} + +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 = ckalloc(sizeof(FsPath)); + + SETPATHOBJ(copyPtr, copyFsPathPtr); + + if (srcFsPathPtr->translatedPathPtr == srcPtr) { + /* Cycle in src -> make cycle in copy. */ + copyFsPathPtr->translatedPathPtr = copyPtr; + } else { + copyFsPathPtr->translatedPathPtr = srcFsPathPtr->translatedPathPtr; + if (copyFsPathPtr->translatedPathPtr != NULL) { + Tcl_IncrRefCount(copyFsPathPtr->translatedPathPtr); + } + } + + if (srcFsPathPtr->normPathPtr == srcPtr) { + /* Cycle in src -> make cycle in copy. */ + copyFsPathPtr->normPathPtr = copyPtr; + } else { + 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; + + copyPtr->typePtr = &tclFsPathType; +} + +/* + *--------------------------------------------------------------------------- + * + * UpdateStringOfFsPath -- + * + * Gives an object a valid string rep. + * + * Results: + * None. + * + * Side effects: + * Memory may be allocated. + * + *--------------------------------------------------------------------------- + */ + +static void +UpdateStringOfFsPath( + register 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); + + pathPtr->bytes = TclGetStringFromObj(copy, &cwdLen); + pathPtr->length = cwdLen; + copy->bytes = &tclEmptyString; + copy->length = 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, + ClientData *clientDataPtr) +{ + /* + * 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 (pathPtr->typePtr == &tclFsPathType) { + 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 tclFsPathType. 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; +} + +/* + * Local Variables: + * mode: c + * c-basic-offset: 4 + * fill-column: 78 + * End: + */ |