#include <xvfs-core.h>
#include <string.h>
#include <tcl.h>
#define XVFS_ROOT_MOUNTPOINT "//xvfs:/"
struct xvfs_tclfs_instance_info {
struct Xvfs_FSInfo *fsInfo;
Tcl_Obj *mountpoint;
};
static struct xvfs_tclfs_instance_info xvfs_tclfs_standalone_info;
/*
* Internal Core Utilities
*/
static const char *xvfs_relativePath(Tcl_Obj *path, struct xvfs_tclfs_instance_info *info) {
const char *pathStr, *rootStr;
int pathLen, rootLen;
pathStr = Tcl_GetStringFromObj(path, &pathLen);
rootStr = Tcl_GetStringFromObj(info->mountpoint, &rootLen);
if (pathLen < rootLen) {
return(NULL);
}
if (memcmp(pathStr, rootStr, rootLen) != 0) {
return(NULL);
}
if (pathLen == rootLen) {
return("");
}
/* XXX:TODO: Should this use the native OS path separator ? */
if (pathStr[rootLen] != '/') {
return(NULL);
}
return(pathStr + rootLen + 1);
}
/*
* Internal Tcl_Filesystem functions, with the appropriate instance info
*/
static int xvfs_tclfs_pathInFilesystem(Tcl_Obj *path, ClientData *dataPtr, struct xvfs_tclfs_instance_info *instanceInfo) {
const char *relativePath;
relativePath = xvfs_relativePath(path, instanceInfo);
if (!relativePath) {
return(-1);
}
return(TCL_OK);
}
static int xvfs_tclfs_stat(Tcl_Obj *path, Tcl_StatBuf *statBuf, struct xvfs_tclfs_instance_info *instanceInfo) {
const char *pathStr;
int retval;
pathStr = xvfs_relativePath(path, instanceInfo);
retval = instanceInfo->fsInfo->getInfoProc(pathStr, statBuf);
return(retval);
}
static Tcl_Obj *xvfs_tclfs_listVolumes(struct xvfs_tclfs_instance_info *instanceInfo) {
return(NULL);
}
static Tcl_Channel xvfs_tclfs_openFileChannel(Tcl_Interp *interp, Tcl_Obj *path, int mode, int permissions, struct xvfs_tclfs_instance_info *instanceInfo) {
const char *pathStr;
pathStr = xvfs_relativePath(path, instanceInfo);
fprintf(stderr, "Called open(%s)!\n", pathStr);
return(NULL);
}
/*
* Tcl_Filesystem handlers for the standalone implementation
*/
static int xvfs_tclfs_standalone_pathInFilesystem(Tcl_Obj *path, ClientData *dataPtr) {
return(xvfs_tclfs_pathInFilesystem(path, dataPtr, &xvfs_tclfs_standalone_info));
}
static int xvfs_tclfs_standalone_stat(Tcl_Obj *path, Tcl_StatBuf *statBuf) {
return(xvfs_tclfs_stat(path, statBuf, &xvfs_tclfs_standalone_info));
}
static Tcl_Obj *xvfs_tclfs_standalone_listVolumes(void) {
return(xvfs_tclfs_listVolumes(&xvfs_tclfs_standalone_info));
}
static Tcl_Channel xvfs_tclfs_standalone_openFileChannel(Tcl_Interp *interp, Tcl_Obj *path, int mode, int permissions) {
return(xvfs_tclfs_openFileChannel(interp, path, mode, permissions, &xvfs_tclfs_standalone_info));
}
/*
* There are three (3) modes of operation for Xvfs_Register:
* 1. standalone -- We register our own Tcl_Filesystem
* and handle requests under `//xvfs:/<fsName>`
* 2. client -- A single Tcl_Filesystem is registered for the
* interp to handle requests under `//xvfs:/` which
* then dispatches to the appropriate registered
* handler
* 3. flexible -- Attempts to find a core Xvfs instance for the
* process at runtime, if found do #2, otherwise
* fallback to #1
*
*/
static int xvfs_standalone_register(Tcl_Interp *interp, struct Xvfs_FSInfo *fsInfo) {
Tcl_Filesystem *xvfs_tclfs_Info;
int tcl_ret;
static int registered = 0;
/*
* Ensure this instance is not already registered
*/
if (registered) {
return(TCL_OK);
}
registered = 1;
/*
* In standalone mode, we only support the same protocol we are
* compiling for.
*/
if (fsInfo->protocolVersion != XVFS_PROTOCOL_VERSION) {
if (interp) {
Tcl_SetResult(interp, "Protocol mismatch", NULL);
}
return(TCL_ERROR);
}
xvfs_tclfs_Info = (Tcl_Filesystem *) Tcl_AttemptAlloc(sizeof(*xvfs_tclfs_Info));
if (!xvfs_tclfs_Info) {
if (interp) {
Tcl_SetResult(interp, "Unable to allocate Tcl_Filesystem object", NULL);
}
return(TCL_ERROR);
}
xvfs_tclfs_Info->typeName = strdup("xvfs");
xvfs_tclfs_Info->structureLength = sizeof(*xvfs_tclfs_Info);
xvfs_tclfs_Info->version = TCL_FILESYSTEM_VERSION_1;
xvfs_tclfs_Info->pathInFilesystemProc = xvfs_tclfs_standalone_pathInFilesystem;
xvfs_tclfs_Info->dupInternalRepProc = NULL;
xvfs_tclfs_Info->freeInternalRepProc = NULL;
xvfs_tclfs_Info->internalToNormalizedProc = NULL;
xvfs_tclfs_Info->createInternalRepProc = NULL;
xvfs_tclfs_Info->normalizePathProc = NULL;
xvfs_tclfs_Info->filesystemPathTypeProc = NULL;
xvfs_tclfs_Info->filesystemSeparatorProc = NULL;
xvfs_tclfs_Info->statProc = xvfs_tclfs_standalone_stat;
xvfs_tclfs_Info->accessProc = NULL;
xvfs_tclfs_Info->openFileChannelProc = xvfs_tclfs_standalone_openFileChannel;
xvfs_tclfs_Info->matchInDirectoryProc = NULL;
xvfs_tclfs_Info->utimeProc = NULL;
xvfs_tclfs_Info->linkProc = NULL;
xvfs_tclfs_Info->listVolumesProc = xvfs_tclfs_standalone_listVolumes;
xvfs_tclfs_Info->fileAttrStringsProc = NULL;
xvfs_tclfs_Info->fileAttrsGetProc = NULL;
xvfs_tclfs_Info->fileAttrsSetProc = NULL;
xvfs_tclfs_Info->createDirectoryProc = NULL;
xvfs_tclfs_Info->removeDirectoryProc = NULL;
xvfs_tclfs_Info->deleteFileProc = NULL;
xvfs_tclfs_Info->copyFileProc = NULL;
xvfs_tclfs_Info->renameFileProc = NULL;
xvfs_tclfs_Info->copyDirectoryProc = NULL;
xvfs_tclfs_Info->lstatProc = NULL;
xvfs_tclfs_Info->loadFileProc = NULL;
xvfs_tclfs_Info->getCwdProc = NULL;
xvfs_tclfs_Info->chdirProc = NULL;
xvfs_tclfs_standalone_info.fsInfo = fsInfo;
xvfs_tclfs_standalone_info.mountpoint = Tcl_NewObj();
Tcl_AppendStringsToObj(xvfs_tclfs_standalone_info.mountpoint, XVFS_ROOT_MOUNTPOINT, fsInfo->name, NULL);
tcl_ret = Tcl_FSRegister(NULL, xvfs_tclfs_Info);
if (tcl_ret != TCL_OK) {
if (interp) {
Tcl_SetResult(interp, "Tcl_FSRegister() failed", NULL);
}
return(tcl_ret);
}
return(TCL_OK);
}
int Xvfs_Register(Tcl_Interp *interp, struct Xvfs_FSInfo *fsInfo) {
return(xvfs_standalone_register(interp, fsInfo));
}