tclcmdah.c

linux系统下的音频通信

/* 
 * tclCmdAH.c --
 *
 *	This file contains the top-level command routines for most of
 *	the Tcl built-in commands whose names begin with the letters
 *	A to H.
 *
 * Copyright (c) 1987-1993 The Regents of the University of California.
 * Copyright (c) 1994-1997 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * SCCS: @(#) tclCmdAH.c 1.159 97/10/31 13:06:07
 */

#include "tclInt.h"
#include "tclPort.h"

/*
 * Prototypes for local procedures defined in this file:
 */

static char *		GetTypeFromMode _ANSI_ARGS_((int mode));
static int		StoreStatData _ANSI_ARGS_((Tcl_Interp *interp,
			    char *varName, struct stat *statPtr));

/*
 *----------------------------------------------------------------------
 *
 * Tcl_BreakCmd --
 *
 *	This procedure is invoked to process the "break" 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 "break" or the name
 *	to which "break" was renamed: e.g., "set z break; $z"
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	See the user documentation.
 *
 *----------------------------------------------------------------------
 */

	/* ARGSUSED */
int
Tcl_BreakCmd(dummy, interp, argc, argv)
    ClientData dummy;			/* Not used. */
    Tcl_Interp *interp;			/* Current interpreter. */
    int argc;				/* Number of arguments. */
    char **argv;			/* Argument strings. */
{
    if (argc != 1) {
	Tcl_AppendResult(interp, "wrong # args: should be \"",
		argv[0], "\"", (char *) NULL);
	return TCL_ERROR;
    }
    return TCL_BREAK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_CaseObjCmd --
 *
 *	This procedure is invoked to process the "case" 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_CaseObjCmd(dummy, interp, objc, objv)
    ClientData dummy;		/* Not used. */
    Tcl_Interp *interp;		/* Current interpreter. */
    int objc;			/* Number of arguments. */
    Tcl_Obj *CONST objv[];	/* Argument objects. */
{
    register int i;
    int body, result;
    char *string, *arg;
    int argLen, caseObjc;
    Tcl_Obj *CONST *caseObjv;
    Tcl_Obj *armPtr;

    if (objc < 3) {
	Tcl_WrongNumArgs(interp, 1, objv,
		"string ?in? patList body ... ?default body?");
	return TCL_ERROR;
    }

    /*
     * THIS FAILS IF AN OBJECT'S STRING REP HAS A NULL BYTE.
     */
    
    string = Tcl_GetStringFromObj(objv[1], &argLen);
    body = -1;

    arg = Tcl_GetStringFromObj(objv[2], &argLen);
    if (strcmp(arg, "in") == 0) {
	i = 3;
    } else {
	i = 2;
    }
    caseObjc = objc - i;
    caseObjv = objv + i;

    /*
     * If all of the pattern/command pairs are lumped into a single
     * argument, split them out again.
     * THIS FAILS IF THE ARG'S STRING REP CONTAINS A NULL
     */

    if (caseObjc == 1) {
	Tcl_Obj **newObjv;
	
	Tcl_ListObjGetElements(interp, caseObjv[0], &caseObjc, &newObjv);
	caseObjv = newObjv;
    }

    for (i = 0;  i < caseObjc;  i += 2) {
	int patObjc, j;
	char **patObjv;
	char *pat;
	register char *p;

	if (i == (caseObjc-1)) {
	    Tcl_ResetResult(interp);
	    Tcl_AppendToObj(Tcl_GetObjResult(interp),
	            "extra case pattern with no body", -1);
	    return TCL_ERROR;
	}

	/*
	 * Check for special case of single pattern (no list) with
	 * no backslash sequences.
	 */

	pat = Tcl_GetStringFromObj(caseObjv[i], &argLen);
	for (p = pat;  *p != 0;  p++) {	/* FAILS IF NULL BYTE */
	    if (isspace(UCHAR(*p)) || (*p == '\\')) {
		break;
	    }
	}
	if (*p == 0) {
	    if ((*pat == 'd') && (strcmp(pat, "default") == 0)) {
		body = i+1;
	    }
	    if (Tcl_StringMatch(string, pat)) {
		body = i+1;
		goto match;
	    }
	    continue;
	}


	/*
	 * Break up pattern lists, then check each of the patterns
	 * in the list.
	 */

	result = Tcl_SplitList(interp, pat, &patObjc, &patObjv);
	if (result != TCL_OK) {
	    return result;
	}
	for (j = 0; j < patObjc; j++) {
	    if (Tcl_StringMatch(string, patObjv[j])) {
		body = i+1;
		break;
	    }
	}
	ckfree((char *) patObjv);
	if (j < patObjc) {
	    break;
	}
    }

    match:
    if (body != -1) {
	armPtr = caseObjv[body-1];
	result = Tcl_EvalObj(interp, caseObjv[body]);
	if (result == TCL_ERROR) {
	    char msg[100];
	    
	    arg = Tcl_GetStringFromObj(armPtr, &argLen);
	    sprintf(msg, "\n    (\"%.*s\" arm line %d)", argLen, arg,
	            interp->errorLine);
	    Tcl_AddObjErrorInfo(interp, msg, -1);
	}
	return result;
    }

    /*
     * Nothing matched: return nothing.
     */

    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_CatchObjCmd --
 *
 *	This object-based procedure is invoked to process the "catch" 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_CatchObjCmd(dummy, interp, objc, objv)
    ClientData dummy;		/* Not used. */
    Tcl_Interp *interp;		/* Current interpreter. */
    int objc;			/* Number of arguments. */
    Tcl_Obj *CONST objv[];	/* Argument objects. */
{
    Tcl_Obj *varNamePtr = NULL;
    int result;

    if ((objc != 2) && (objc != 3)) {
	Tcl_WrongNumArgs(interp, 1, objv, "command ?varName?");
	return TCL_ERROR;
    }

    /*
     * Save a pointer to the variable name object, if any, in case the
     * Tcl_EvalObj reallocates the bytecode interpreter's evaluation
     * stack rendering objv invalid.
     */
    
    if (objc == 3) {
	varNamePtr = objv[2];
    }
    
    result = Tcl_EvalObj(interp, objv[1]);
    
    if (objc == 3) {
	if (Tcl_ObjSetVar2(interp, varNamePtr, NULL,
		    Tcl_GetObjResult(interp), TCL_PARSE_PART1) == NULL) {
	    Tcl_ResetResult(interp);
	    Tcl_AppendToObj(Tcl_GetObjResult(interp),  
	            "couldn't save command result in variable", -1);
	    return TCL_ERROR;
	}
    }

    /*
     * Set the interpreter's object result to an integer object holding the
     * integer Tcl_EvalObj result. Note that we don't bother generating a
     * string representation. We reset the interpreter's object result
     * to an unshared empty object and then set it to be an integer object.
     */

    Tcl_ResetResult(interp);
    Tcl_SetIntObj(Tcl_GetObjResult(interp), result);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_CdObjCmd --
 *
 *	This procedure is invoked to process the "cd" Tcl command.
 *	See the user documentation for details on what it does.
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	See the user documentation.
 *
 *----------------------------------------------------------------------
 */

	/* ARGSUSED */
int
Tcl_CdObjCmd(dummy, interp, objc, objv)
    ClientData dummy;		/* Not used. */
    Tcl_Interp *interp;		/* Current interpreter. */
    int objc;			/* Number of arguments. */
    Tcl_Obj *CONST objv[];	/* Argument objects. */
{
    char *dirName;
    int dirLength;
    Tcl_DString buffer;
    int result;

    if (objc > 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "dirName");
	return TCL_ERROR;
    }

    if (objc == 2) {
	dirName = Tcl_GetStringFromObj(objv[1], &dirLength);
    } else {
	dirName = "~";
    }
    dirName = Tcl_TranslateFileName(interp, dirName, &buffer);
    if (dirName == NULL) {
	return TCL_ERROR;
    }
    result = TclChdir(interp, dirName);
    Tcl_DStringFree(&buffer);
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_ConcatObjCmd --
 *
 *	This object-based procedure is invoked to process the "concat" 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_ConcatObjCmd(dummy, interp, objc, objv)
    ClientData dummy;		/* Not used. */
    Tcl_Interp *interp;		/* Current interpreter. */
    int objc;			/* Number of arguments. */
    Tcl_Obj *CONST objv[];	/* Argument objects. */
{
    if (objc >= 2) {
	Tcl_SetObjResult(interp, Tcl_ConcatObj(objc-1, objv+1));
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_ContinueCmd -
 *
 *	This procedure is invoked to process the "continue" 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 "continue" or the name
 *	to which "continue" was renamed: e.g., "set z continue; $z"
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	See the user documentation.
 *
 *----------------------------------------------------------------------
 */

	/* ARGSUSED */
int
Tcl_ContinueCmd(dummy, interp, argc, argv)
    ClientData dummy;			/* Not used. */
    Tcl_Interp *interp;			/* Current interpreter. */
    int argc;				/* Number of arguments. */
    char **argv;			/* Argument strings. */
{
    if (argc != 1) {
	Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
		"\"", (char *) NULL);
	return TCL_ERROR;
    }
    return TCL_CONTINUE;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_ErrorObjCmd --
 *
 *	This procedure is invoked to process the "error" 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_ErrorObjCmd(dummy, interp, objc, objv)
    ClientData dummy;		/* Not used. */
    Tcl_Interp *interp;		/* Current interpreter. */
    int objc;			/* Number of arguments. */
    Tcl_Obj *CONST objv[];	/* Argument objects. */
{
    Interp *iPtr = (Interp *) interp;
    register Tcl_Obj *namePtr;
    char *info;
    int infoLen;

    if ((objc < 2) || (objc > 4)) {
	Tcl_WrongNumArgs(interp, 1, objv, "message ?errorInfo? ?errorCode?");
	return TCL_ERROR;
    }
    
    if (objc >= 3) {		/* process the optional info argument */
	info = Tcl_GetStringFromObj(objv[2], &infoLen);
	if (*info != 0) {
	    Tcl_AddObjErrorInfo(interp, info, infoLen);
	    iPtr->flags |= ERR_ALREADY_LOGGED;
	}
    }
    
    if (objc == 4) {
	namePtr = Tcl_NewStringObj("errorCode", -1);
	Tcl_ObjSetVar2(interp, namePtr, (Tcl_Obj *) NULL, objv[3],
		TCL_GLOBAL_ONLY);
	iPtr->flags |= ERROR_CODE_SET;
	Tcl_DecrRefCount(namePtr); /* we're done with name object */
    }
    
    Tcl_SetObjResult(interp, objv[1]);
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_EvalObjCmd --
 *
 *	This object-based procedure is invoked to process the "eval" 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_EvalObjCmd(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;
    register Tcl_Obj *objPtr;

    if (objc < 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "arg ?arg ...?");
	return TCL_ERROR;
    }
    
    if (objc == 2) {
	result = Tcl_EvalObj(interp, objv[1]);
    } else {
	/*
	 * More than one argument: concatenate them together with spaces
	 * between, then evaluate the result.
	 */
    
	objPtr = Tcl_ConcatObj(objc-1, objv+1);
	result = Tcl_EvalObj(interp, objPtr);
	Tcl_DecrRefCount(objPtr);  /* we're done with the object */
    }
    if (result == TCL_ERROR) {