man/man3/Tcl_GetIndexFromObj.3 - toolchains/skids - Git at Google

 '\"
 '\" Copyright (c) 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.
 '\"
 '\" RCS: @(#) $Id: GetIndex.3,v 1.10 2002/02/28 05:11:25 dgp Exp $
 '\"
 '\" The definitions below are for supplemental macros used in Tcl/Tk
 '\" manual entries.
 '\"
 '\" .AP type name in/out ?indent?
 '\"	Start paragraph describing an argument to a library procedure.
 '\"	type is type of argument (int, etc.), in/out is either "in", "out",
 '\"	or "in/out" to describe whether procedure reads or modifies arg,
 '\"	and indent is equivalent to second arg of .IP (shouldn't ever be
 '\"	needed;  use .AS below instead)
 '\"
 '\" .AS ?type? ?name?
 '\"	Give maximum sizes of arguments for setting tab stops.  Type and
 '\"	name are examples of largest possible arguments that will be passed
 '\"	to .AP later.  If args are omitted, default tab stops are used.
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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.
 '\"
 '\" .UL arg1 arg2
 '\"	Print arg1 underlined, then print arg2 normally.
 '\"
 '\" RCS: @(#) $Id: man.macros,v 1.4 2000/08/25 06:18:32 ericm Exp $
 '\"
 '\"	# Set up traps and other miscellaneous stuff for Tcl/Tk man pages.
 .if t .wh -1.3i ^B
 .nr ^l \n(.l
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 '\"	# Start an argument description
 .de AP
 .ie !"\\$4"" .TP \\$4
 .el \{\
 .   ie !"\\$2"" .TP \\n()Cu
 .   el          .TP 15
 .\}
 .ta \\n()Au \\n()Bu
 .ie !"\\$3"" \{\
 \&\\$1	\\fI\\$2\\fP	(\\$3)
 .\".b
 .\}
 .el \{\
 .br
 .ie !"\\$2"" \{\
 \&\\$1	\\fI\\$2\\fP
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 \&\\fI\\$1\\fP
 .\}
 .\}
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 ..
 .AS Tcl_Interp Tcl_CreateInterp in/out
 '\"	# BS - start boxed text
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 .\}
 .el \}\
 \h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\l'|0u-1.5n\(ul'
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 .el \h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\h'|0u'\c
 .\}
 .if \\n(^v \{\
 .nr ^x \\n(^tu+1v-\\n(^Yu
 \kx\h'-\\nxu'\h'|\\n(^lu+3n'\ky\L'-\\n(^xu'\v'\\n(^xu'\h'|0u'\c
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 ..
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 .LP
 See the \\fBoptions\\fR manual entry for details on the standard options.
 ..
 '\"	# OP - start of full description for a single option
 .de OP
 .LP
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 Command-Line Name:	\\fB\\$1\\fR
 Database Name:	\\fB\\$2\\fR
 Database Class:	\\fB\\$3\\fR
 .fi
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 \\$1\l'|0\(ul'\\$2
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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 ASCII 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 ASCII 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
	'\"
	'\" Copyright (c) 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.
	'\"
	'\" RCS: @(#) $Id: GetIndex.3,v 1.10 2002/02/28 05:11:25 dgp Exp $
	'\"
	'\" The definitions below are for supplemental macros used in Tcl/Tk
	'\" manual entries.
	'\"
	'\" .AP type name in/out ?indent?
	'\" Start paragraph describing an argument to a library procedure.
	'\" type is type of argument (int, etc.), in/out is either "in", "out",
	'\" or "in/out" to describe whether procedure reads or modifies arg,
	'\" and indent is equivalent to second arg of .IP (shouldn't ever be
	'\" needed; use .AS below instead)
	'\"
	'\" .AS ?type? ?name?
	'\" Give maximum sizes of arguments for setting tab stops. Type and
	'\" name are examples of largest possible arguments that will be passed
	'\" to .AP later. If args are omitted, default tab stops are used.
	'\"
	'\" .BS
	'\" Start box enclosure. From here until next .BE, everything will be
	'\" enclosed in one large box.
	'\"
	'\" .BE
	'\" End of box enclosure.
	'\"
	'\" .CS
	'\" Begin code excerpt.
	'\"
	'\" .CE
	'\" End code excerpt.
	'\"
	'\" .VS ?version? ?br?
	'\" Begin vertical sidebar, for use in marking newly-changed parts
	'\" of man pages. The first argument is ignored and used for recording
	'\" the version when the .VS was added, so that the sidebars can be
	'\" found and removed when they reach a certain age. If another argument
	'\" is present, then a line break is forced before starting the sidebar.
	'\"
	'\" .VE
	'\" End of vertical sidebar.
	'\"
	'\" .DS
	'\" Begin an indented unfilled display.
	'\"
	'\" .DE
	'\" End of indented unfilled display.
	'\"
	'\" .SO
	'\" Start of list of standard options for a Tk widget. The
	'\" options follow on successive lines, in four columns separated
	'\" by tabs.
	'\"
	'\" .SE
	'\" 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.
	'\"
	'\" .UL arg1 arg2
	'\" Print arg1 underlined, then print arg2 normally.
	'\"
	'\" RCS: @(#) $Id: man.macros,v 1.4 2000/08/25 06:18:32 ericm Exp $
	'\"
	'\" # Set up traps and other miscellaneous stuff for Tcl/Tk man pages.
	.if t .wh -1.3i ^B
	.nr ^l \n(.l
	.ad b
	'\" # Start an argument description
	.de AP
	.ie !"\\$4"" .TP \\$4
	.el \{\
	. ie !"\\$2"" .TP \\n()Cu
	. el .TP 15
	.\}
	.ta \\n()Au \\n()Bu
	.ie !"\\$3"" \{\
	\&\\$1 \\fI\\$2\\fP (\\$3)
	.\".b
	.\}
	.el \{\
	.br
	.ie !"\\$2"" \{\
	\&\\$1 \\fI\\$2\\fP
	.\}
	.el \{\
	\&\\fI\\$1\\fP
	.\}
	.\}
	..
	'\" # define tabbing values for .AP
	.de AS
	.nr )A 10n
	.if !"\\$1"" .nr )A \\w'\\$1'u+3n
	.nr )B \\n()Au+15n
	.\"
	.if !"\\$2"" .nr )B \\w'\\$2'u+\\n()Au+3n
	.nr )C \\n()Bu+\\w'(in/out)'u+2n
	..
	.AS Tcl_Interp Tcl_CreateInterp in/out
	'\" # BS - start boxed text
	'\" # ^y = starting y location
	'\" # ^b = 1
	.de BS
	.br
	.mk ^y
	.nr ^b 1u
	.if n .nf
	.if n .ti 0
	.if n \l'\\n(.lu\(ul'
	.if n .fi
	..
	'\" # BE - end boxed text (draw box now)
	.de BE
	.nf
	.ti 0
	.mk ^t
	.ie n \l'\\n(^lu\(ul'
	.el \{\
	.\" Draw four-sided box normally, but don't draw top of
	.\" box if the box started on an earlier page.
	.ie !\\n(^b-1 \{\
	\h'-1.5n'\L'\|\\n(^yu-1v'\l'\\n(^lu+3n\(ul'\L'\\n(^tu+1v-\\n(^yu'\l'\|0u-1.5n\(ul'
	.\}
	.el \}\
	\h'-1.5n'\L'\|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\l'\|0u-1.5n\(ul'
	.\}
	.\}
	.fi
	.br
	.nr ^b 0
	..
	'\" # VS - start vertical sidebar
	'\" # ^Y = starting y location
	'\" # ^v = 1 (for troff; for nroff this doesn't matter)
	.de VS
	.if !"\\$2"" .br
	.mk ^Y
	.ie n 'mc \s12\(br\s0
	.el .nr ^v 1u
	..
	'\" # VE - end of vertical sidebar
	.de VE
	.ie n 'mc
	.el \{\
	.ev 2
	.nf
	.ti 0
	.mk ^t
	\h'\|\\n(^lu+3n'\L'\|\\n(^Yu-1v\(bv'\v'\\n(^tu+1v-\\n(^Yu'\h'-\|\\n(^lu+3n'
	.sp -1
	.fi
	.ev
	.\}
	.nr ^v 0
	..
	'\" # Special macro to handle page bottom: finish off current
	'\" # box/sidebar if in box/sidebar mode, then invoked standard
	'\" # page bottom macro.
	.de ^B
	.ev 2
	'ti 0
	'nf
	.mk ^t
	.if \\n(^b \{\
	.\" Draw three-sided box if this is the box's first page,
	.\" draw two sides but no top otherwise.
	.ie !\\n(^b-1 \h'-1.5n'\L'\|\\n(^yu-1v'\l'\\n(^lu+3n\(ul'\L'\\n(^tu+1v-\\n(^yu'\h'\|0u'\c
	.el \h'-1.5n'\L'\|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\h'\|0u'\c
	.\}
	.if \\n(^v \{\
	.nr ^x \\n(^tu+1v-\\n(^Yu
	\kx\h'-\\nxu'\h'\|\\n(^lu+3n'\ky\L'-\\n(^xu'\v'\\n(^xu'\h'\|0u'\c
	.\}
	.bp
	'fi
	.ev
	.if \\n(^b \{\
	.mk ^y
	.nr ^b 2
	.\}
	.if \\n(^v \{\
	.mk ^Y
	.\}
	..
	'\" # DS - begin display
	.de DS
	.RS
	.nf
	.sp
	..
	'\" # DE - end display
	.de DE
	.fi
	.RE
	.sp
	..
	'\" # SO - start of list of standard options
	.de SO
	.SH "STANDARD OPTIONS"
	.LP
	.nf
	.ta 5.5c 11c
	.ft B
	..
	'\" # SE - end of list of standard options
	.de SE
	.fi
	.ft R
	.LP
	See the \\fBoptions\\fR manual entry for details on the standard options.
	..
	'\" # OP - start of full description for a single option
	.de OP
	.LP
	.nf
	.ta 4c
	Command-Line Name: \\fB\\$1\\fR
	Database Name: \\fB\\$2\\fR
	Database Class: \\fB\\$3\\fR
	.fi
	.IP
	..
	'\" # CS - begin code excerpt
	.de CS
	.RS
	.nf
	.ta .25i .5i .75i 1i
	..
	'\" # CE - end code excerpt
	.de CE
	.fi
	.RE
	..
	.de UL
	\\$1\l'\|0\(ul'\\$2
	..
	.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 ASCII 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 ASCII 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