tclcmdah.c

linux系统下的音频通信

	    goto checkAccess;
	  case FILE_EXISTS:
	    if (objc != 3) {
	    	errorString = "exists name";
	    	goto not3Args;
	    }
	    mode = F_OK;
	    goto checkAccess;
    }

	
    /*
     * Lastly, check stuff that requires the file to be stat-ed.
     */

    if (fileName == NULL) {
	result = TCL_ERROR;
	goto done;
    }
    
    switch (index) {
    	case FILE_ATIME:
    	    if (objc != 3) {
	    	errorString = "atime name";
	    	goto not3Args;
	    }
	    
	    if (TclStat(fileName, &statBuf) == -1) {
	    	goto badStat;
	    }
	    Tcl_SetLongObj(resultPtr, (long) statBuf.st_atime);
	    goto done;
    	case FILE_ISDIRECTORY:
    	    if (objc != 3) {
    	    	errorString = "isdirectory name";
    	    	goto not3Args;
    	    }
    	    statOp = 2;
    	    break;
    	case FILE_ISFILE:
    	    if (objc != 3) {
    	    	errorString = "isfile name";
    	    	goto not3Args;
    	    }
    	    statOp = 1;
    	    break;
    	case FILE_LSTAT:
    	    if (objc != 4) {
    	    	Tcl_WrongNumArgs(interp, 1, objv, "lstat name varName");
    	    	result = TCL_ERROR;
    	    	goto done;
    	    }
    	    
    	    if (lstat(fileName, &statBuf) == -1) {
    	    	Tcl_AppendStringsToObj(resultPtr, "couldn't lstat \"",
    	    		Tcl_GetStringFromObj(objv[2], &length), "\": ",
    	    		Tcl_PosixError(interp), (char *) NULL);
    	    	result = TCL_ERROR;
    	    	goto done;
    	    }
    	    result = StoreStatData(interp, Tcl_GetStringFromObj(objv[3],
    	    	    &length), &statBuf);
    	    goto done;
	case FILE_MTIME:
	    if (objc != 3) {
	    	errorString = "mtime name";
	    	goto not3Args;
	    }
	    if (TclStat(fileName, &statBuf) == -1) {
	    	goto badStat;
	    }
	    Tcl_SetLongObj(resultPtr, (long) statBuf.st_mtime);
	    goto done;
	case FILE_OWNED:
	    if (objc != 3) {
	    	errorString = "owned name";
	    	goto not3Args;
	    }	        	    
    	    statOp = 0;
    	    break;
	case FILE_READLINK: {
	    char linkValue[MAXPATHLEN + 1];
	    int linkLength;
		
	    if (objc != 3) {
	    	errorString = "readlink name";
	        goto not3Args;
	    }

	    /*
	     * If S_IFLNK isn't defined it means that the machine doesn't
	     * support symbolic links, so the file can't possibly be a
	     * symbolic link.  Generate an EINVAL error, which is what
	     * happens on machines that do support symbolic links when
	     * you invoke readlink on a file that isn't a symbolic link.
	     */

#ifndef S_IFLNK
	    linkLength = -1;
	    errno = EINVAL;
#else
	    linkLength = readlink(fileName, linkValue, sizeof(linkValue) - 1);
#endif /* S_IFLNK */
	    if (linkLength == -1) {
	    	Tcl_AppendStringsToObj(resultPtr, "couldn't readlink \"", 
	    		Tcl_GetStringFromObj(objv[2], &length), "\": ", 
	    		Tcl_PosixError(interp), (char *) NULL);
	    	result = TCL_ERROR;
	    	goto done;
	    }
	    linkValue[linkLength] = 0;
	    Tcl_SetStringObj(resultPtr, linkValue, linkLength);
	    goto done;
	}
	case FILE_SIZE:
	    if (objc != 3) {
	    	errorString = "size name";
	    	goto not3Args;
	    }
	    if (TclStat(fileName, &statBuf) == -1) {
	    	goto badStat;
	    }
	    Tcl_SetLongObj(resultPtr, (long) statBuf.st_size);
	    goto done;
	case FILE_STAT:
	    if (objc != 4) {
	    	Tcl_WrongNumArgs(interp, 1, objv, "stat name varName");
	    	result = TCL_ERROR;
	    	goto done;
	    }

	    if (TclStat(fileName, &statBuf) == -1) {
badStat:
		Tcl_AppendStringsToObj(resultPtr, "couldn't stat \"", 
			Tcl_GetStringFromObj(objv[2], &length),
		    	"\": ", Tcl_PosixError(interp), (char *) NULL);
	    	result = TCL_ERROR;
	    	goto done;
	    }
	    result = StoreStatData(interp, Tcl_GetStringFromObj(objv[3],
	    	    &length), &statBuf);
	    goto done;
	case FILE_TYPE:
	    if (objc != 3) {
	    	errorString = "type name";
	    	goto not3Args;
	    }
	    if (lstat(fileName, &statBuf) == -1) {
	    	goto badStat;
	    }
	    errorString = GetTypeFromMode((int) statBuf.st_mode);
	    Tcl_SetStringObj(resultPtr, errorString, -1);
	    goto done;
    }

    if (TclStat(fileName, &statBuf) == -1) {
    	Tcl_SetBooleanObj(resultPtr, 0);
	goto done;
    }
    switch (statOp) {
	case 0:
	    /*
	     * For Windows and Macintosh, there are no user ids 
	     * associated with a file, so we always return 1.
	     */

#if (defined(__WIN32__) || defined(MAC_TCL))
	    mode = 1;
#else
	    mode = (geteuid() == statBuf.st_uid);
#endif
	    break;
	case 1:
	    mode = S_ISREG(statBuf.st_mode);
	    break;
	case 2:
	    mode = S_ISDIR(statBuf.st_mode);
	    break;
    }
    Tcl_SetBooleanObj(resultPtr, mode);

done:
    Tcl_DStringFree(&buffer);
    return result;

not3Args:
    Tcl_WrongNumArgs(interp, 1, objv, errorString);
    result = TCL_ERROR;
    goto done;
}

/*
 *----------------------------------------------------------------------
 *
 * StoreStatData --
 *
 *	This is a utility procedure that breaks out the fields of a
 *	"stat" structure and stores them in textual form into the
 *	elements of an associative array.
 *
 * Results:
 *	Returns a standard Tcl return value.  If an error occurs then
 *	a message is left in interp->result.
 *
 * Side effects:
 *	Elements of the associative array given by "varName" are modified.
 *
 *----------------------------------------------------------------------
 */

static int
StoreStatData(interp, varName, statPtr)
    Tcl_Interp *interp;			/* Interpreter for error reports. */
    char *varName;			/* Name of associative array variable
					 * in which to store stat results. */
    struct stat *statPtr;		/* Pointer to buffer containing
					 * stat data to store in varName. */
{
    char string[30];

    sprintf(string, "%ld", (long) statPtr->st_dev);
    if (Tcl_SetVar2(interp, varName, "dev", string, TCL_LEAVE_ERR_MSG)
	    == NULL) {
	return TCL_ERROR;
    }
    sprintf(string, "%ld", (long) statPtr->st_ino);
    if (Tcl_SetVar2(interp, varName, "ino", string, TCL_LEAVE_ERR_MSG)
	    == NULL) {
	return TCL_ERROR;
    }
    sprintf(string, "%ld", (long) statPtr->st_mode);
    if (Tcl_SetVar2(interp, varName, "mode", string, TCL_LEAVE_ERR_MSG)
	    == NULL) {
	return TCL_ERROR;
    }
    sprintf(string, "%ld", (long) statPtr->st_nlink);
    if (Tcl_SetVar2(interp, varName, "nlink", string, TCL_LEAVE_ERR_MSG)
	    == NULL) {
	return TCL_ERROR;
    }
    sprintf(string, "%ld", (long) statPtr->st_uid);
    if (Tcl_SetVar2(interp, varName, "uid", string, TCL_LEAVE_ERR_MSG)
	    == NULL) {
	return TCL_ERROR;
    }
    sprintf(string, "%ld", (long) statPtr->st_gid);
    if (Tcl_SetVar2(interp, varName, "gid", string, TCL_LEAVE_ERR_MSG)
	    == NULL) {
	return TCL_ERROR;
    }
    sprintf(string, "%lu", (unsigned long) statPtr->st_size);
    if (Tcl_SetVar2(interp, varName, "size", string, TCL_LEAVE_ERR_MSG)
	    == NULL) {
	return TCL_ERROR;
    }
    sprintf(string, "%ld", (long) statPtr->st_atime);
    if (Tcl_SetVar2(interp, varName, "atime", string, TCL_LEAVE_ERR_MSG)
	    == NULL) {
	return TCL_ERROR;
    }
    sprintf(string, "%ld", (long) statPtr->st_mtime);
    if (Tcl_SetVar2(interp, varName, "mtime", string, TCL_LEAVE_ERR_MSG)
	    == NULL) {
	return TCL_ERROR;
    }
    sprintf(string, "%ld", (long) statPtr->st_ctime);
    if (Tcl_SetVar2(interp, varName, "ctime", string, TCL_LEAVE_ERR_MSG)
	    == NULL) {
	return TCL_ERROR;
    }
    if (Tcl_SetVar2(interp, varName, "type",
	    GetTypeFromMode((int) statPtr->st_mode), TCL_LEAVE_ERR_MSG) 
            == NULL) {
	return TCL_ERROR;
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * GetTypeFromMode --
 *
 *	Given a mode word, returns a string identifying the type of a
 *	file.
 *
 * Results:
 *	A static text string giving the file type from mode.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static char *
GetTypeFromMode(mode)
    int mode;
{
    if (S_ISREG(mode)) {
	return "file";
    } else if (S_ISDIR(mode)) {
	return "directory";
    } else if (S_ISCHR(mode)) {
	return "characterSpecial";
    } else if (S_ISBLK(mode)) {
	return "blockSpecial";
    } else if (S_ISFIFO(mode)) {
	return "fifo";
#ifdef S_ISLNK
    } else if (S_ISLNK(mode)) {
	return "link";
#endif
#ifdef S_ISSOCK
    } else if (S_ISSOCK(mode)) {
	return "socket";
#endif
    }
    return "unknown";
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_ForCmd --
 *
 *      This procedure is invoked to process the "for" Tcl command.
 *      See the user documentation for details on what it does.
 *
 *	With the bytecode compiler, this procedure is only called when
 *	a command name is computed at runtime, and is "for" or the name
 *	to which "for" was renamed: e.g.,
 *	"set z for; $z {set i 0} {$i<100} {incr i} {puts $i}"
 *
 * Results:
 *      A standard Tcl result.
 *
 * Side effects:
 *      See the user documentation.
 *
 *----------------------------------------------------------------------
 */

        /* ARGSUSED */
int
Tcl_ForCmd(dummy, interp, argc, argv)
    ClientData dummy;                   /* Not used. */
    Tcl_Interp *interp;                 /* Current interpreter. */
    int argc;                           /* Number of arguments. */
    char **argv;                        /* Argument strings. */
{
    int result, value;

    if (argc != 5) {
        Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
                " start test next command\"", (char *) NULL);
        return TCL_ERROR;
    }

    result = Tcl_Eval(interp, argv[1]);
    if (result != TCL_OK) {
        if (result == TCL_ERROR) {
            Tcl_AddErrorInfo(interp, "\n    (\"for\" initial command)");
        }
        return result;
    }
    while (1) {
        result = Tcl_ExprBoolean(interp, argv[2], &value);
        if (result != TCL_OK) {
            return result;
        }
        if (!value) {
            break;
        }
        result = Tcl_Eval(interp, argv[4]);
        if ((result != TCL_OK) && (result != TCL_CONTINUE)) {
            if (result == TCL_ERROR) {
                char msg[60];
                sprintf(msg, "\n    (\"for\" body line %d)",interp->errorLine);
                Tcl_AddErrorInfo(interp, msg);
            }
            break;
        }
        result = Tcl_Eval(interp, argv[3]);
	if (result == TCL_BREAK) {
            break;
        } else if (result != TCL_OK) {
            if (result == TCL_ERROR) {
                Tcl_AddErrorInfo(interp, "\n    (\"for\" loop-end command)");
            }
            return result;
        }
    }
    if (result == TCL_BREAK) {
        result = TCL_OK;
    }
    if (result == TCL_OK) {
        Tcl_ResetResult(interp);
    }
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_ForeachObjCmd --
 *
 *	This object-based procedure is invoked to process the "foreach" Tcl
 *	command.  See the user documentation for details on what it does.
 *
 * Results:
 *	A standard Tcl object result.
 *
 * Side effects:
 *	See the user documentation.
 *
 *----------------------------------------------------------------------
 */

	/* ARGSUSED */
int
Tcl_ForeachObjCmd(dummy, interp, objc, objv)
    ClientData dummy;		/* Not used. */
    Tcl_Interp *interp;		/* Current interpreter. */
    int objc;			/* Number of arguments. */
    Tcl_Obj *CONST objv[];	/* Argument objects. */
{
    int result = TCL_OK;
    int i;			/* i selects a value list */
    int j, maxj;		/* Number of loop iterations */
    int v;			/* v selects a loop variable */
    int numLists;		/* Count of value lists */
    Tcl_Obj *bodyPtr;

    /*
     * We copy the argument object pointers into a local array to avoid
     * the problem that "objv" might become invalid. It is a pointer into
     * the evaluation stack and that stack might be grown and reallocated
     * if the loop body requires a large amount of stack space.
     */
    
#define NUM_ARGS 9
    Tcl_Obj *(argObjStorage[NUM_ARGS]);
    Tcl_Obj **argObjv = argObjStorage;
    
#define STATIC_LIST_SIZE 4
    int indexArray[STATIC_LIST_SIZE];	  /* Array of value list indices */
    int varcListArray[STATIC_LIST_SIZE];  /* # loop variables per list */
    Tcl_Obj **varvListArray[STATIC_LIST_SIZE]; /* Array of var name lists */
    int argcListArray[STATIC_LIST_SIZE];  /* Array of value list sizes */
    Tcl_Obj **argvListArray[STATIC_LIST_SIZE]; /* Array of value lists */

    int *index = indexArray;
    int *varcList = varcListArray;
    Tcl_Obj ***varvList = varvListArray;
    int *argcList = argcListArray;
    Tcl_Obj ***argvList = argvListArray;

    if (objc < 4 || (objc%2 != 0)) {
	Tcl_WrongNumArgs(interp, 1, objv,
		"varList list ?varList list ...? command");
	return TCL_ERROR;
    }

    /*
     * Create the object argument array "argObjv". Make sure argObjv is
     * large enough to hold the objc arguments.
     */

    if (objc > NUM_ARGS) {
	argObjv = (Tcl_Obj **) ckalloc(objc * sizeof(Tcl_Obj *));
    }
    for (i = 0;  i < objc;  i++) {
	argObjv[i] = objv[i];
    }

    /*
     * Manage numList parallel value lists.
     * argvList[i] is a value list counted by argcList[i]
     * varvList[i] is the list of variables associated with the value list
     * varcList[i] is the number of variables associated with the value list
     * index[i] is the current pointer into the value list argvList[i]
     */

    numLists = (objc-2)/2;
    if (numLists > STATIC_LIST_SIZE) {
	index = (int *) ckalloc(numLists * sizeof(int));
	varcList = (int *) ckalloc(numLists * sizeof(int));
	varvList = (Tcl_Obj ***) ckalloc(numLists * sizeof(Tcl_Obj **));
	argcList = (int *) ckalloc(numLists * sizeof(int));
	argvList = (Tcl_Obj ***) ckalloc(numLists * sizeof(Tcl_Obj **));
    }
    for (i = 0;  i < numLists;  i++) {
	index[i] = 0;
	varcList[i] = 0;