path: root/macosx/tclMacOSXFCmd.c

/*
 * tclMacOSXFCmd.c
 *
 *	This file implements the MacOSX specific portion of file manipulation
 *	subcommands of the "file" command.
 *
 * Copyright (c) 2003 Tcl Core Team.
 * Copyright (c) 2003-2005 Daniel A. Steffen <das@users.sourceforge.net>
 *
 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tclMacOSXFCmd.c,v 1.6 2005/11/27 02:33:49 das Exp $
 */

#include "tclInt.h"

#ifdef HAVE_GETATTRLIST
#include <sys/attr.h>
#include <sys/paths.h>
#endif

/* Darwin 8 copyfile API */
#ifdef HAVE_COPYFILE
#ifdef HAVE_COPYFILE_H
#include <copyfile.h>
#else
int copyfile(const char *from, const char *to, void *state, uint32_t flags);
#define COPYFILE_ACL            (1<<0)
#define COPYFILE_XATTR          (1<<2)
#define COPYFILE_NOFOLLOW_SRC   (1<<18)
#endif
#endif

#include <libkern/OSByteOrder.h>

/*
 * Constants for file attributes subcommand. Need to be kept in sync with
 * tclUnixFCmd.c !
 */

enum {
    UNIX_GROUP_ATTRIBUTE,
    UNIX_OWNER_ATTRIBUTE,
    UNIX_PERMISSIONS_ATTRIBUTE,
#ifdef HAVE_CHFLAGS
    UNIX_READONLY_ATTRIBUTE,
#endif
#ifdef MAC_OSX_TCL
    MACOSX_CREATOR_ATTRIBUTE,
    MACOSX_TYPE_ATTRIBUTE,
    MACOSX_HIDDEN_ATTRIBUTE,
    MACOSX_RSRCLENGTH_ATTRIBUTE,
#endif
};

typedef u_int32_t OSType;

static int		Tcl_GetOSTypeFromObj(Tcl_Interp *interp,
			    Tcl_Obj *objPtr, OSType *osTypePtr);
static Tcl_Obj *	Tcl_NewOSTypeStringObj(CONST OSType newOSType);

enum {
   kIsInvisible = 0x4000,
};

#define kFinfoIsInvisible (OSSwapHostToBigConstInt16(kIsInvisible))

typedef	struct finderinfo {
    u_int32_t type;
    u_int32_t creator;
    u_int16_t fdFlags;
    u_int32_t location;
    u_int16_t reserved;
    u_int32_t extendedFileInfo[4];
} __attribute__ ((__packed__)) finderinfo;

typedef struct fileinfobuf {
    u_int32_t info_length;
    u_int32_t data[8];
} fileinfobuf;

/*
 *----------------------------------------------------------------------
 *
 * TclMacOSXGetFileAttribute
 *
 *	Gets a MacOSX attribute of a file. Which attribute is controlled by
 *	objIndex. The object will have ref count 0.
 *
 * Results:
 *	Standard TCL result. Returns a new Tcl_Obj in attributePtrPtr if there
 *	is no error.
 *
 * Side effects:
 *	A new object is allocated.
 *
 *----------------------------------------------------------------------
 */

int
TclMacOSXGetFileAttribute(
    Tcl_Interp *interp,		 /* The interp we are using for errors. */
    int objIndex,		 /* The index of the attribute. */
    Tcl_Obj *fileName,		 /* The name of the file (UTF-8). */
    Tcl_Obj **attributePtrPtr)	 /* A pointer to return the object with. */
{
#ifdef HAVE_GETATTRLIST
    int result;
    Tcl_StatBuf statBuf;
    struct attrlist alist;
    fileinfobuf finfo;
    finderinfo *finder = (finderinfo*)(&finfo.data);
    off_t *rsrcForkSize = (off_t*)(&finfo.data);
    CONST char *native;

    result = TclpObjStat(fileName, &statBuf);

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

    if (S_ISDIR(statBuf.st_mode) && objIndex != MACOSX_HIDDEN_ATTRIBUTE) {
	/*
	 * Directories only support attribute "-hidden".
	 */

	errno = EISDIR;
	Tcl_AppendResult(interp, "invalid attribute: ",
		Tcl_PosixError(interp), NULL);
	return TCL_ERROR;
    }

    bzero(&alist, sizeof(struct attrlist));
    alist.bitmapcount = ATTR_BIT_MAP_COUNT;
    if (objIndex == MACOSX_RSRCLENGTH_ATTRIBUTE) {
	alist.fileattr = ATTR_FILE_RSRCLENGTH;
    } else {
	alist.commonattr = ATTR_CMN_FNDRINFO;
    }
    native = Tcl_FSGetNativePath(fileName);
    result = getattrlist(native, &alist, &finfo, sizeof(fileinfobuf), 0);

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

    switch (objIndex) {
    case MACOSX_CREATOR_ATTRIBUTE:
	*attributePtrPtr = Tcl_NewOSTypeStringObj(
		OSSwapBigToHostInt32(finder->creator));
	break;
    case MACOSX_TYPE_ATTRIBUTE:
	*attributePtrPtr = Tcl_NewOSTypeStringObj(
		OSSwapBigToHostInt32(finder->type));
	break;
    case MACOSX_HIDDEN_ATTRIBUTE:
	*attributePtrPtr = Tcl_NewBooleanObj(
		(finder->fdFlags & kFinfoIsInvisible) != 0);
	break;
    case MACOSX_RSRCLENGTH_ATTRIBUTE:
	*attributePtrPtr = Tcl_NewWideIntObj(*rsrcForkSize);
	break;
    }
    return TCL_OK;
#else
    Tcl_AppendResult(interp, "Mac OS X file attributes not supported", NULL);
    return TCL_ERROR;
#endif
}

/*
 *---------------------------------------------------------------------------
 *
 * TclMacOSXSetFileAttribute --
 *
 *	Sets a MacOSX attribute of a file. Which attribute is controlled by
 *	objIndex.
 *
 * Results:
 *	Standard TCL result.
 *
 * Side effects:
 *	As above.
 *
 *---------------------------------------------------------------------------
 */

int
TclMacOSXSetFileAttribute(
    Tcl_Interp *interp,		/* The interp for error reporting. */
    int objIndex,		/* The index of the attribute. */
    Tcl_Obj *fileName,		/* The name of the file (UTF-8). */
    Tcl_Obj *attributePtr)	/* New owner for file. */
{
#ifdef HAVE_GETATTRLIST
    int result;
    Tcl_StatBuf statBuf;
    struct attrlist alist;
    fileinfobuf finfo;
    finderinfo *finder = (finderinfo*)(&finfo.data);
    off_t *rsrcForkSize = (off_t*)(&finfo.data);
    CONST char *native;

    result = TclpObjStat(fileName, &statBuf);

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

    if (S_ISDIR(statBuf.st_mode) && objIndex != MACOSX_HIDDEN_ATTRIBUTE) {
	/*
	 * Directories only support attribute "-hidden".
	 */

	errno = EISDIR;
	Tcl_AppendResult(interp, "invalid attribute: ",
		Tcl_PosixError(interp), NULL);
	return TCL_ERROR;
    }

    bzero(&alist, sizeof(struct attrlist));
    alist.bitmapcount = ATTR_BIT_MAP_COUNT;
    if (objIndex == MACOSX_RSRCLENGTH_ATTRIBUTE) {
	alist.fileattr = ATTR_FILE_RSRCLENGTH;
    } else {
	alist.commonattr = ATTR_CMN_FNDRINFO;
    }
    native = Tcl_FSGetNativePath(fileName);
    result = getattrlist(native, &alist, &finfo, sizeof(fileinfobuf), 0);

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

    if (objIndex != MACOSX_RSRCLENGTH_ATTRIBUTE) {
	OSType t;
	int h;

	switch (objIndex) {
	case MACOSX_CREATOR_ATTRIBUTE:
	    if (Tcl_GetOSTypeFromObj(interp, attributePtr, &t) != TCL_OK) {
		return TCL_ERROR;
	    }
	    finder->creator = OSSwapHostToBigInt32(t);
	    break;
	case MACOSX_TYPE_ATTRIBUTE:
	    if (Tcl_GetOSTypeFromObj(interp, attributePtr, &t) != TCL_OK) {
		return TCL_ERROR;
	    }
	    finder->type = OSSwapHostToBigInt32(t);
	    break;
	case MACOSX_HIDDEN_ATTRIBUTE:
	    if (Tcl_GetBooleanFromObj(interp, attributePtr, &h) != TCL_OK) {
		return TCL_ERROR;
	    }
	    if (h) {
		finder->fdFlags |= kFinfoIsInvisible;
	    } else {
		finder->fdFlags &= ~kFinfoIsInvisible;
	    }
	    break;
	}

	result = setattrlist(native, &alist,
		&finfo.data, sizeof(finfo.data), 0);

	if (result != 0) {
	    Tcl_AppendResult(interp, "could not set attributes of \"",
		    TclGetString(fileName), "\": ",
		    Tcl_PosixError(interp), NULL);
	    return TCL_ERROR;
	}
    } else {
	Tcl_WideInt newRsrcForkSize;

	if (Tcl_GetWideIntFromObj(interp, attributePtr,
		&newRsrcForkSize) != TCL_OK) {
	    return TCL_ERROR;
	}

	if (newRsrcForkSize != *rsrcForkSize) {
	    Tcl_DString ds;

	    /*
	     * Only setting rsrclength to 0 to strip a file's resource fork is
	     * supported.
	     */

	    if(newRsrcForkSize != 0) {
		Tcl_AppendResult(interp,
			"setting nonzero rsrclength not supported", NULL);
		return TCL_ERROR;
	    }

	    /*
	     * Construct path to resource fork.
	     */

	    Tcl_DStringInit(&ds);
	    Tcl_DStringAppend(&ds, native, -1);
	    Tcl_DStringAppend(&ds, _PATH_RSRCFORKSPEC, -1);

	    result = truncate(Tcl_DStringValue(&ds), (off_t)0);

	    Tcl_DStringFree(&ds);

	    if (result != 0) {
		Tcl_AppendResult(interp,
			"could not truncate resource fork of \"",
			TclGetString(fileName), "\": ",
			Tcl_PosixError(interp), NULL);
		return TCL_ERROR;
	    }
	}
    }
    return TCL_OK;
#else
    Tcl_AppendResult(interp, "Mac OS X file attributes not supported", NULL);
    return TCL_ERROR;
#endif
}

/*
 *---------------------------------------------------------------------------
 *
 * TclMacOSXCopyFileAttributes --
 *
 *	Copy the MacOSX attributes and resource fork (if present) from one
 *	file to another.
 *
 * Results:
 *	Standard Tcl result.
 *
 * Side effects:
 *	MacOSX attributes and resource fork are updated in the new file to
 *	reflect the old file.
 *
 *---------------------------------------------------------------------------
 */

int
TclMacOSXCopyFileAttributes(
    CONST char *src,		/* Path name of source file (native). */
    CONST char *dst,		/* Path name of target file (native). */
    CONST Tcl_StatBuf *statBufPtr)
				/* Stat info for source file */
{
#if defined(HAVE_COPYFILE)
    if (copyfile(src, dst, NULL, COPYFILE_XATTR |
	    (S_ISLNK(statBufPtr->st_mode) ? COPYFILE_NOFOLLOW_SRC :
		                            COPYFILE_ACL)) < 0) {
        return TCL_ERROR;
    }
    return TCL_OK;
#elif defined(HAVE_GETATTRLIST)
    struct attrlist alist;
    fileinfobuf finfo;
    off_t *rsrcForkSize = (off_t*)(&finfo.data);

    bzero(&alist, sizeof(struct attrlist));
    alist.bitmapcount = ATTR_BIT_MAP_COUNT;
    alist.commonattr = ATTR_CMN_FNDRINFO;

    if (getattrlist(src, &alist, &finfo, sizeof(fileinfobuf), 0)) {
	return TCL_ERROR;
    }

    if (setattrlist(dst, &alist, &finfo.data, sizeof(finfo.data), 0)) {
	return TCL_ERROR;
    }

    if (!S_ISDIR(statBufPtr->st_mode)) {
	/*
	 * Only copy non-empty resource fork.
	 */

	alist.commonattr = 0;
	alist.fileattr = ATTR_FILE_RSRCLENGTH;

	if (getattrlist(src, &alist, &finfo, sizeof(fileinfobuf), 0)) {
	    return TCL_ERROR;
	}

	if(*rsrcForkSize > 0) {
	    int result;
	    Tcl_DString ds_src, ds_dst;

	    /*
	     * Construct paths to resource forks.
	     */

	    Tcl_DStringInit(&ds_src);
	    Tcl_DStringAppend(&ds_src, src, -1);
	    Tcl_DStringAppend(&ds_src, _PATH_RSRCFORKSPEC, -1);
	    Tcl_DStringInit(&ds_dst);
	    Tcl_DStringAppend(&ds_dst, dst, -1);
	    Tcl_DStringAppend(&ds_dst, _PATH_RSRCFORKSPEC, -1);

	    result = TclUnixCopyFile(Tcl_DStringValue(&ds_src),
		    Tcl_DStringValue(&ds_dst), statBufPtr, 1);

	    Tcl_DStringFree(&ds_src);
	    Tcl_DStringFree(&ds_dst);

	    if (result != 0) {
		return TCL_ERROR;
	    }
	}
    }
    return TCL_OK;
#else
    return TCL_ERROR;
#endif
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_GetOSTypeFromObj --
 *
 *	Attempt to return an OSType from the Tcl object "objPtr".
 *
 * Results:
 *	Standard TCL result. If an error occurs during conversion, an error
 *	message is left in interp->objResult.
 *
 * Side effects:
 *	The string representation of objPtr will be updated if necessary.
 *
 *----------------------------------------------------------------------
 */

static int
Tcl_GetOSTypeFromObj(
    Tcl_Interp *interp,		/* Used for error reporting if not NULL. */
    Tcl_Obj *objPtr,		/* The object from which to get an OSType. */
    OSType *osTypePtr)		/* Place to store resulting OSType. */
{
    char *string;
    int length, result = TCL_OK;
    Tcl_DString ds;
    Tcl_Encoding encoding = Tcl_GetEncoding(NULL, "macRoman");

    string = Tcl_GetStringFromObj(objPtr, &length);
    Tcl_UtfToExternalDString(encoding, string, length, &ds);

    if (Tcl_DStringLength(&ds) > 4) {
	Tcl_AppendResult(interp, "expected Macintosh OS type but got \"",
		string, "\": ", NULL);
	result = TCL_ERROR;
    } else {
	char string[4] = {'\0','\0','\0','\0'};
	memcpy(string, Tcl_DStringValue(&ds),
		(size_t) Tcl_DStringLength(&ds));
	*osTypePtr = (OSType) string[0] << 24 |
	             (OSType) string[1] << 16 |
	             (OSType) string[2] <<  8 |
	             (OSType) string[3];
    }
    Tcl_DStringFree(&ds);
    Tcl_FreeEncoding(encoding);
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_NewOSTypeStringObj --
 *
 *	Create a new OSType string object.
 *
 * Results:
 *	The newly created string object is returned, it has ref count 0.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static Tcl_Obj *
Tcl_NewOSTypeStringObj(
    CONST OSType newOSType)    /* OSType used to initialize the new object. */
{
    char string[5];
    Tcl_Obj *resultPtr;
    Tcl_DString ds;
    Tcl_Encoding encoding = Tcl_GetEncoding(NULL, "macRoman");

    string[0] = (char) (newOSType >> 24);
    string[1] = (char) (newOSType >> 16);
    string[2] = (char) (newOSType >>  8);
    string[3] = (char) (newOSType);
    string[4] = '\0';
    Tcl_ExternalToUtfDString(encoding, string, -1, &ds);
    resultPtr = Tcl_NewStringObj(Tcl_DStringValue(&ds),
	    Tcl_DStringLength(&ds));
    Tcl_DStringFree(&ds);
    Tcl_FreeEncoding(encoding);
    return resultPtr;
}

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */