[OpenSPARC-T2-DV] / tools / src / nas,5.n2.os.2 / lib / python / man / man3 / Tcl_SetByteArrayLength.3

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.TH Tcl_ByteArrayObj 3 8.1 Tcl "Tcl Library Procedures"
.BS
.SH NAME
Tcl_NewByteArrayObj, Tcl_SetByteArrayObj, Tcl_GetByteArrayFromObj, Tcl_SetByteArrayLength \- manipulate Tcl objects as a arrays of bytes 
.SH SYNOPSIS
.nf
\fB#include <tcl.h>\fR
.sp
Tcl_Obj *
\fBTcl_NewByteArrayObj\fR(\fIbytes, length\fR)
.sp
void 
\fBTcl_SetByteArrayObj\fR(\fIobjPtr, bytes, length\fR)
.sp
unsigned char *
\fBTcl_GetByteArrayFromObj\fR(\fIobjPtr, lengthPtr\fR)
.sp
unsigned char *
\fBTcl_SetByteArrayLength\fR(\fIobjPtr, length\fR)
.SH ARGUMENTS
.AS "unsigned char" *lengthPtr in/out
.AP "CONST unsigned char" *bytes in
The array of bytes used to initialize or set a byte-array object.
.AP int length in
The length of the array of bytes.  It must be >= 0.
.AP Tcl_Obj *objPtr in/out
For \fBTcl_SetByteArrayObj\fR, this points to the object to be converted to
byte-array type.  For \fBTcl_GetByteArrayFromObj\fR and
\fBTcl_SetByteArrayLength\fR, this points to the object from which to get
the byte-array value; if \fIobjPtr\fR does not already point to a byte-array
object, it will be converted to one.
.AP int *lengthPtr out
If non-NULL, filled with the length of the array of bytes in the object.
.BE

.SH DESCRIPTION
.PP
These procedures are used to create, modify, and read Tcl byte-array objects
from C code.  Byte-array objects are typically used to hold the
results of binary IO operations or data structures created with the
\fBbinary\fR command.  In Tcl, an array of bytes is not equivalent to a
string.  Conceptually, a string is an array of Unicode characters, while a
byte-array is an array of 8-bit quantities with no implicit meaning.
Accesser functions are provided to get the string representation of a
byte-array or to convert an arbitrary object to a byte-array.  Obtaining the
string representation of a byte-array object (by calling
\fBTcl_GetStringFromObj\fR) produces a properly formed UTF-8 sequence with a
one-to-one mapping between the bytes in the internal representation and the
UTF-8 characters in the string representation.  
.PP
\fBTcl_NewByteArrayObj\fR and \fBTcl_SetByteArrayObj\fR will
create a new object of byte-array type or modify an existing object to have a
byte-array type.  Both of these procedures set the object's type to be
byte-array and set the object's internal representation to a copy of the
array of bytes given by \fIbytes\fR. \fBTcl_NewByteArrayObj\fR returns a
pointer to a newly allocated object with a reference count of zero.
\fBTcl_SetByteArrayObj\fR invalidates any old string representation and, if
the object is not already a byte-array object, frees any old internal
representation.
.PP
\fBTcl_GetByteArrayFromObj\fR converts a Tcl object to byte-array type and
returns a pointer to the object's new internal representation as an array of
bytes.  The length of this array is stored in \fIlengthPtr\fR if
\fIlengthPtr\fR is non-NULL.  The storage for the array of bytes is owned by
the object and should not be freed.  The contents of the array may be
modified by the caller only if the object is not shared and the caller
invalidates the string representation.  
.PP
\fBTcl_SetByteArrayLength\fR converts the Tcl object to byte-array type
and changes the length of the object's internal representation as an
array of bytes.  If \fIlength\fR is greater than the space currently
allocated for the array, the array is reallocated to the new length; the
newly allocated bytes at the end of the array have arbitrary values.  If
\fIlength\fR is less than the space currently allocated for the array,
the length of array is reduced to the new length.  The return value is a
pointer to the object's new array of bytes.  

.SH "SEE ALSO"
Tcl_GetStringFromObj, Tcl_NewObj, Tcl_IncrRefCount, Tcl_DecrRefCount

.SH KEYWORDS
object, byte array, utf, unicode, internationalization
Commit	Line	Data
86530b38 AT	1	'\"
	2	'\" Copyright (c) 1997 Sun Microsystems, Inc.
	3	'\"
	4	'\" See the file "license.terms" for information on usage and redistribution
	5	'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
	6	'\"
	7	'\" RCS: @(#) $Id: ByteArrObj.3,v 1.3 2001/04/04 16:07:20 kennykb Exp $
	8	'\"
	9	'\" The definitions below are for supplemental macros used in Tcl/Tk
	10	'\" manual entries.
	11	'\"
	12	'\" .AP type name in/out ?indent?
	13	'\" Start paragraph describing an argument to a library procedure.
	14	'\" type is type of argument (int, etc.), in/out is either "in", "out",
	15	'\" or "in/out" to describe whether procedure reads or modifies arg,
	16	'\" and indent is equivalent to second arg of .IP (shouldn't ever be
	17	'\" needed; use .AS below instead)
	18	'\"
	19	'\" .AS ?type? ?name?
	20	'\" Give maximum sizes of arguments for setting tab stops. Type and
	21	'\" name are examples of largest possible arguments that will be passed
	22	'\" to .AP later. If args are omitted, default tab stops are used.
	23	'\"
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	26	'\" enclosed in one large box.
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	55	'\" options follow on successive lines, in four columns separated
	56	'\" by tabs.
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	59	'\" End of list of standard options for a Tk widget.
	60	'\"
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	62	'\" Start of description of a specific option. cmdName gives the
	63	'\" option's name as specified in the class command, dbName gives
	64	'\" the option's name in the option database, and dbClass gives
65	'\" the option's class in the option database.
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68	'\" Print arg1 underlined, then print arg2 normally.
69	'\"
70	'\" RCS: @(#) $Id: man.macros,v 1.4 2000/08/25 06:18:32 ericm Exp $
71	'\"
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73	.if t .wh -1.3i ^B
74	.nr ^l \n(.l
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77	.de AP
78	.ie !"\\$4"" .TP \\$4
79	.el \{\
80	. ie !"\\$2"" .TP \\n()Cu
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244	..
245	.TH Tcl_ByteArrayObj 3 8.1 Tcl "Tcl Library Procedures"
246	.BS
247	.SH NAME
248	Tcl_NewByteArrayObj, Tcl_SetByteArrayObj, Tcl_GetByteArrayFromObj, Tcl_SetByteArrayLength \- manipulate Tcl objects as a arrays of bytes
249	.SH SYNOPSIS
250	.nf
251	\fB#include <tcl.h>\fR
252	.sp
253	Tcl_Obj *
254	\fBTcl_NewByteArrayObj\fR(\fIbytes, length\fR)
255	.sp
256	void
257	\fBTcl_SetByteArrayObj\fR(\fIobjPtr, bytes, length\fR)
258	.sp
259	unsigned char *
260	\fBTcl_GetByteArrayFromObj\fR(\fIobjPtr, lengthPtr\fR)
261	.sp
262	unsigned char *
263	\fBTcl_SetByteArrayLength\fR(\fIobjPtr, length\fR)
264	.SH ARGUMENTS
265	.AS "unsigned char" *lengthPtr in/out
266	.AP "CONST unsigned char" *bytes in
267	The array of bytes used to initialize or set a byte-array object.
268	.AP int length in
269	The length of the array of bytes. It must be >= 0.
270	.AP Tcl_Obj *objPtr in/out
271	For \fBTcl_SetByteArrayObj\fR, this points to the object to be converted to
272	byte-array type. For \fBTcl_GetByteArrayFromObj\fR and
273	\fBTcl_SetByteArrayLength\fR, this points to the object from which to get
274	the byte-array value; if \fIobjPtr\fR does not already point to a byte-array
275	object, it will be converted to one.
276	.AP int *lengthPtr out
277	If non-NULL, filled with the length of the array of bytes in the object.
278	.BE
279
280	.SH DESCRIPTION
281	.PP
282	These procedures are used to create, modify, and read Tcl byte-array objects
283	from C code. Byte-array objects are typically used to hold the
284	results of binary IO operations or data structures created with the
285	\fBbinary\fR command. In Tcl, an array of bytes is not equivalent to a
286	string. Conceptually, a string is an array of Unicode characters, while a
287	byte-array is an array of 8-bit quantities with no implicit meaning.
288	Accesser functions are provided to get the string representation of a
289	byte-array or to convert an arbitrary object to a byte-array. Obtaining the
290	string representation of a byte-array object (by calling
291	\fBTcl_GetStringFromObj\fR) produces a properly formed UTF-8 sequence with a
292	one-to-one mapping between the bytes in the internal representation and the
293	UTF-8 characters in the string representation.
294	.PP
295	\fBTcl_NewByteArrayObj\fR and \fBTcl_SetByteArrayObj\fR will
296	create a new object of byte-array type or modify an existing object to have a
297	byte-array type. Both of these procedures set the object's type to be
298	byte-array and set the object's internal representation to a copy of the
299	array of bytes given by \fIbytes\fR. \fBTcl_NewByteArrayObj\fR returns a
300	pointer to a newly allocated object with a reference count of zero.
301	\fBTcl_SetByteArrayObj\fR invalidates any old string representation and, if
302	the object is not already a byte-array object, frees any old internal
303	representation.
304	.PP
305	\fBTcl_GetByteArrayFromObj\fR converts a Tcl object to byte-array type and
306	returns a pointer to the object's new internal representation as an array of
307	bytes. The length of this array is stored in \fIlengthPtr\fR if
308	\fIlengthPtr\fR is non-NULL. The storage for the array of bytes is owned by
309	the object and should not be freed. The contents of the array may be
310	modified by the caller only if the object is not shared and the caller
311	invalidates the string representation.
312	.PP
313	\fBTcl_SetByteArrayLength\fR converts the Tcl object to byte-array type
314	and changes the length of the object's internal representation as an
315	array of bytes. If \fIlength\fR is greater than the space currently
316	allocated for the array, the array is reallocated to the new length; the
317	newly allocated bytes at the end of the array have arbitrary values. If
318	\fIlength\fR is less than the space currently allocated for the array,
319	the length of array is reduced to the new length. The return value is a
320	pointer to the object's new array of bytes.
321
322	.SH "SEE ALSO"
323	Tcl_GetStringFromObj, Tcl_NewObj, Tcl_IncrRefCount, Tcl_DecrRefCount
324
325	.SH KEYWORDS
326	object, byte array, utf, unicode, internationalization