[OpenSPARC-T2-SAM] / sam-t2 / devtools / amd64 / man / man3 / Tcl_GetIndexFromObj.3

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'\" Copyright (c) 1997 Sun Microsystems, Inc.
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'\" RCS: @(#) $Id: GetIndex.3,v 1.10.2.1 2003/07/18 15:20:51 dgp Exp $
'\" 
'\" The definitions below are for supplemental macros used in Tcl/Tk
'\" manual entries.
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'\"	Give maximum sizes of arguments for setting tab stops.  Type and
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'\"	options follow on successive lines, in four columns separated
'\"	by tabs.
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'\"	End of list of standard options for a Tk widget.
'\"
'\" .OP cmdName dbName dbClass
'\"	Start of description of a specific option.  cmdName gives the
'\"	option's name as specified in the class command, dbName gives
'\"	the option's name in the option database, and dbClass gives
'\"	the option's class in the option database.
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.AS Tcl_Interp Tcl_CreateInterp in/out
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.TH Tcl_GetIndexFromObj 3 8.1 Tcl "Tcl Library Procedures"
.BS
.SH NAME
Tcl_GetIndexFromObj, Tcl_GetIndexFromObjStruct \- lookup string in table of keywords
.SH SYNOPSIS
.nf
\fB#include <tcl.h>\fR
.sp
int
\fBTcl_GetIndexFromObj\fR(\fIinterp, objPtr, tablePtr, msg, flags,
indexPtr\fR)
.VS
.sp
int
\fBTcl_GetIndexFromObjStruct\fR(\fIinterp, objPtr, structTablePtr, offset,
msg, flags, indexPtr\fR)
.VE
.SH ARGUMENTS
.AS "CONST char" **tablePtr
.AP Tcl_Interp *interp in
Interpreter to use for error reporting; if NULL, then no message is
provided on errors.
.AP Tcl_Obj *objPtr in/out
The string value of this object is used to search through \fItablePtr\fR.
The internal representation is modified to hold the index of the matching
table entry.
.AP "CONST char" **tablePtr in
An array of null-terminated strings.  The end of the array is marked
by a NULL string pointer.
.AP "CONST VOID" *structTablePtr in
An array of arbitrary type, typically some \fBstruct\fP type.
The first member of the structure must be a null-terminated string.
The size of the structure is given by \fIoffset\fP.
.VS
.AP int offset in
The offset to add to structTablePtr to get to the next entry.
The end of the array is marked by a NULL string pointer.
.VE
.AP "CONST char" *msg in
Null-terminated string describing what is being looked up, such as
\fBoption\fR.  This string is included in error messages.
.AP int flags in
OR-ed combination of bits providing additional information for
operation.  The only bit that is currently defined is \fBTCL_EXACT\fR.
.AP int *indexPtr out
The index of the string in \fItablePtr\fR that matches the value of
\fIobjPtr\fR is returned here.
.BE

.SH DESCRIPTION
.PP
This procedure provides an efficient way for looking up keywords,
switch names, option names, and similar things where the value of
an object must be one of a predefined set of values.
\fIObjPtr\fR is compared against each of
the strings in \fItablePtr\fR to find a match.  A match occurs if
\fIobjPtr\fR's string value is identical to one of the strings in
\fItablePtr\fR, or if it is a unique abbreviation
for exactly one of the strings in \fItablePtr\fR and the
\fBTCL_EXACT\fR flag was not specified; in either case
the index of the matching entry is stored at \fI*indexPtr\fR
and TCL_OK is returned.
.PP
If there is no matching entry,
TCL_ERROR is returned and an error message is left in \fIinterp\fR's
result if \fIinterp\fR isn't NULL.  \fIMsg\fR is included in the
error message to indicate what was being looked up.  For example,
if \fImsg\fR is \fBoption\fR the error message will have a form like
\fBbad option "firt": must be first, second, or third\fR.
.PP
If \fBTcl_GetIndexFromObj\fR completes successfully it modifies the
internal representation of \fIobjPtr\fR to hold the address of
the table and the index of the matching entry.  If \fBTcl_GetIndexFromObj\fR
is invoked again with the same \fIobjPtr\fR and \fItablePtr\fR
arguments (e.g. during a reinvocation of a Tcl command), it returns
the matching index immediately without having to redo the lookup
operation.  Note: \fBTcl_GetIndexFromObj\fR assumes that the entries
in \fItablePtr\fR are static: they must not change between
invocations.  If the value of \fIobjPtr\fR is the empty string,
\fBTcl_GetIndexFromObj\fR will treat it as a non-matching value
and return TCL_ERROR.
.VS
.PP
\fBTcl_GetIndexFromObjStruct\fR works just like
\fBTcl_GetIndexFromObj\fR, except that instead of treating
\fItablePtr\fR as an array of string pointers, it treats it as the
first in a series of string ptrs that are spaced apart by \fIoffset\fR
bytes. This is particularly useful when processing things like
\fBTk_ConfigurationSpec\fR, whose string keys are in the same place in
each of several array elements.
.VE

.SH "SEE ALSO"
Tcl_WrongNumArgs

.SH KEYWORDS
index, object, table lookup
Commit	Line	Data
920dae64 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: GetIndex.3,v 1.10.2.1 2003/07/18 15:20:51 dgp 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	'\"
	24	'\" .BS
	25	'\" Start box enclosure. From here until next .BE, everything will be
	26	'\" enclosed in one large box.
	27	'\"
	28	'\" .BE
	29	'\" End of box enclosure.
	30	'\"
	31	'\" .CS
	32	'\" Begin code excerpt.
	33	'\"
	34	'\" .CE
	35	'\" End code excerpt.
	36	'\"
	37	'\" .VS ?version? ?br?
	38	'\" Begin vertical sidebar, for use in marking newly-changed parts
	39	'\" of man pages. The first argument is ignored and used for recording
	40	'\" the version when the .VS was added, so that the sidebars can be
	41	'\" found and removed when they reach a certain age. If another argument
	42	'\" is present, then a line break is forced before starting the sidebar.
	43	'\"
	44	'\" .VE
	45	'\" End of vertical sidebar.
	46	'\"
	47	'\" .DS
	48	'\" Begin an indented unfilled display.
	49	'\"
	50	'\" .DE
	51	'\" End of indented unfilled display.
	52	'\"
	53	'\" .SO
	54	'\" Start of list of standard options for a Tk widget. The
	55	'\" options follow on successive lines, in four columns separated
	56	'\" by tabs.
	57	'\"
	58	'\" .SE
	59	'\" End of list of standard options for a Tk widget.
	60	'\"
	61	'\" .OP cmdName dbName dbClass
	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.
66	'\"
67	'\" .UL arg1 arg2
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	'\"
72	'\" # Set up traps and other miscellaneous stuff for Tcl/Tk man pages.
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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106	..
107	.AS Tcl_Interp Tcl_CreateInterp in/out
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132	.el \}\
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174	.\" draw two sides but no top otherwise.
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176	.el \h'-1.5n'\L'\|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\h'\|0u'\c
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204	..
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206	.de SO
207	.SH "STANDARD OPTIONS"
208	.LP
209	.nf
210	.ta 5.5c 11c
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212	..
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217	.LP
218	See the \\fBoptions\\fR manual entry for details on the standard options.
219	..
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221	.de OP
222	.LP
223	.nf
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225	Command-Line Name: \\fB\\$1\\fR
226	Database Name: \\fB\\$2\\fR
227	Database Class: \\fB\\$3\\fR
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243	\\$1\l'\|0\(ul'\\$2
244	..
245	.TH Tcl_GetIndexFromObj 3 8.1 Tcl "Tcl Library Procedures"
246	.BS
247	.SH NAME
248	Tcl_GetIndexFromObj, Tcl_GetIndexFromObjStruct \- lookup string in table of keywords
249	.SH SYNOPSIS
250	.nf
251	\fB#include <tcl.h>\fR
252	.sp
253	int
254	\fBTcl_GetIndexFromObj\fR(\fIinterp, objPtr, tablePtr, msg, flags,
255	indexPtr\fR)
256	.VS
257	.sp
258	int
259	\fBTcl_GetIndexFromObjStruct\fR(\fIinterp, objPtr, structTablePtr, offset,
260	msg, flags, indexPtr\fR)
261	.VE
262	.SH ARGUMENTS
263	.AS "CONST char" **tablePtr
264	.AP Tcl_Interp *interp in
265	Interpreter to use for error reporting; if NULL, then no message is
266	provided on errors.
267	.AP Tcl_Obj *objPtr in/out
268	The string value of this object is used to search through \fItablePtr\fR.
269	The internal representation is modified to hold the index of the matching
270	table entry.
271	.AP "CONST char" **tablePtr in
272	An array of null-terminated strings. The end of the array is marked
273	by a NULL string pointer.
274	.AP "CONST VOID" *structTablePtr in
275	An array of arbitrary type, typically some \fBstruct\fP type.
276	The first member of the structure must be a null-terminated string.
277	The size of the structure is given by \fIoffset\fP.
278	.VS
279	.AP int offset in
280	The offset to add to structTablePtr to get to the next entry.
281	The end of the array is marked by a NULL string pointer.
282	.VE
283	.AP "CONST char" *msg in
284	Null-terminated string describing what is being looked up, such as
285	\fBoption\fR. This string is included in error messages.
286	.AP int flags in
287	OR-ed combination of bits providing additional information for
288	operation. The only bit that is currently defined is \fBTCL_EXACT\fR.
289	.AP int *indexPtr out
290	The index of the string in \fItablePtr\fR that matches the value of
291	\fIobjPtr\fR is returned here.
292	.BE
293
294	.SH DESCRIPTION
295	.PP
296	This procedure provides an efficient way for looking up keywords,
297	switch names, option names, and similar things where the value of
298	an object must be one of a predefined set of values.
299	\fIObjPtr\fR is compared against each of
300	the strings in \fItablePtr\fR to find a match. A match occurs if
301	\fIobjPtr\fR's string value is identical to one of the strings in
302	\fItablePtr\fR, or if it is a unique abbreviation
303	for exactly one of the strings in \fItablePtr\fR and the
304	\fBTCL_EXACT\fR flag was not specified; in either case
305	the index of the matching entry is stored at \fI*indexPtr\fR
306	and TCL_OK is returned.
307	.PP
308	If there is no matching entry,
309	TCL_ERROR is returned and an error message is left in \fIinterp\fR's
310	result if \fIinterp\fR isn't NULL. \fIMsg\fR is included in the
311	error message to indicate what was being looked up. For example,
312	if \fImsg\fR is \fBoption\fR the error message will have a form like
313	\fBbad option "firt": must be first, second, or third\fR.
314	.PP
315	If \fBTcl_GetIndexFromObj\fR completes successfully it modifies the
316	internal representation of \fIobjPtr\fR to hold the address of
317	the table and the index of the matching entry. If \fBTcl_GetIndexFromObj\fR
318	is invoked again with the same \fIobjPtr\fR and \fItablePtr\fR
319	arguments (e.g. during a reinvocation of a Tcl command), it returns
320	the matching index immediately without having to redo the lookup
321	operation. Note: \fBTcl_GetIndexFromObj\fR assumes that the entries
322	in \fItablePtr\fR are static: they must not change between
323	invocations. If the value of \fIobjPtr\fR is the empty string,
324	\fBTcl_GetIndexFromObj\fR will treat it as a non-matching value
325	and return TCL_ERROR.
326	.VS
327	.PP
328	\fBTcl_GetIndexFromObjStruct\fR works just like
329	\fBTcl_GetIndexFromObj\fR, except that instead of treating
330	\fItablePtr\fR as an array of string pointers, it treats it as the
331	first in a series of string ptrs that are spaced apart by \fIoffset\fR
332	bytes. This is particularly useful when processing things like
333	\fBTk_ConfigurationSpec\fR, whose string keys are in the same place in
334	each of several array elements.
335	.VE
336
337	.SH "SEE ALSO"
338	Tcl_WrongNumArgs
339
340	.SH KEYWORDS
341	index, object, table lookup