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-'\"
-'\" Copyright (c) 1993 The Regents of the University of California.
-'\" Copyright (c) 1994-1996 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: DString.3,v 1.2 1998/09/14 18:39:48 stanton Exp $
-'\" 
-.so man.macros
-.TH Tcl_DString 3 7.4 Tcl "Tcl Library Procedures"
-.BS
-.SH NAME
-Tcl_DStringInit, Tcl_DStringAppend, Tcl_DStringAppendElement, Tcl_DStringStartSublist, Tcl_DStringEndSublist, Tcl_DStringLength, Tcl_DStringValue, Tcl_DStringSetLength, Tcl_DStringFree, Tcl_DStringResult, Tcl_DStringGetResult \- manipulate dynamic strings
-.SH SYNOPSIS
-.nf
-\fB#include <tcl.h>\fR
-.sp
-\fBTcl_DStringInit\fR(\fIdsPtr\fR)
-.sp
-char *
-\fBTcl_DStringAppend\fR(\fIdsPtr, string, length\fR)
-.sp
-char *
-\fBTcl_DStringAppendElement\fR(\fIdsPtr, string\fR)
-.sp
-\fBTcl_DStringStartSublist\fR(\fIdsPtr\fR)
-.sp
-\fBTcl_DStringEndSublist\fR(\fIdsPtr\fR)
-.sp
-int
-\fBTcl_DStringLength\fR(\fIdsPtr\fR)
-.sp
-char *
-\fBTcl_DStringValue\fR(\fIdsPtr\fR)
-.sp
-\fBTcl_DStringSetLength\fR(\fIdsPtr, newLength\fR)
-.sp
-\fBTcl_DStringFree\fR(\fIdsPtr\fR)
-.sp
-\fBTcl_DStringResult\fR(\fIinterp, dsPtr\fR)
-.sp
-\fBTcl_DStringGetResult\fR(\fIinterp, dsPtr\fR)
-.SH ARGUMENTS
-.AS Tcl_DString newLength
-.AP Tcl_DString *dsPtr in/out
-Pointer to structure that is used to manage a dynamic string.
-.AP char *string in
-Pointer to characters to add to dynamic string.
-.AP int length in
-Number of characters from string to add to dynamic string.  If -1,
-add all characters up to null terminating character.
-.AP int newLength in
-New length for dynamic string, not including null terminating
-character.
-.AP Tcl_Interp *interp in/out
-Interpreter whose result is to be set from or moved to the
-dynamic string.
-.BE
-
-.SH DESCRIPTION
-.PP
-Dynamic strings provide a mechanism for building up arbitrarily long
-strings by gradually appending information.  If the dynamic string is
-short then there will be no memory allocation overhead;  as the string
-gets larger, additional space will be allocated as needed.
-.PP
-\fBTcl_DStringInit\fR initializes a dynamic string to zero length.
-The Tcl_DString structure must have been allocated by the caller.
-No assumptions are made about the current state of the structure;
-anything already in it is discarded.
-If the structure has been used previously, \fBTcl_DStringFree\fR should
-be called first to free up any memory allocated for the old
-string.
-.PP
-\fBTcl_DStringAppend\fR adds new information to a dynamic string,
-allocating more memory for the string if needed.
-If \fIlength\fR is less than zero then everything in \fIstring\fR
-is appended to the dynamic string;  otherwise \fIlength\fR
-specifies the number of bytes to append.
-\fBTcl_DStringAppend\fR returns a pointer to the characters of
-the new string.  The string can also be retrieved from the
-\fIstring\fR field of the Tcl_DString structure.
-.PP
-\fBTcl_DStringAppendElement\fR is similar to \fBTcl_DStringAppend\fR
-except that it doesn't take a \fIlength\fR argument (it appends
-all of \fIstring\fR) and it converts the string to a proper list element
-before appending.
-\fBTcl_DStringAppendElement\fR adds a separator space before the
-new list element unless the new list element is the first in a
-list or sub-list (i.e. either the current string is empty, or it
-contains the single character ``{'', or the last two characters of
-the current string are `` {'').
-\fBTcl_DStringAppendElement\fR returns a pointer to the
-characters of the new string.
-.PP
-\fBTcl_DStringStartSublist\fR and \fBTcl_DStringEndSublist\fR can be
-used to create nested lists.
-To append a list element that is itself a sublist, first
-call \fBTcl_DStringStartSublist\fR, then call \fBTcl_DStringAppendElement\fR
-for each of the elements in the sublist, then call
-\fBTcl_DStringEndSublist\fR to end the sublist.
-\fBTcl_DStringStartSublist\fR appends a space character if needed,
-followed by an open brace;  \fBTcl_DStringEndSublist\fR appends
-a close brace.
-Lists can be nested to any depth.
-.PP
-\fBTcl_DStringLength\fR is a macro that returns the current length
-of a dynamic string (not including the terminating null character).
-\fBTcl_DStringValue\fR is a  macro that returns a pointer to the
-current contents of a dynamic string.
-.PP
-.PP
-\fBTcl_DStringSetLength\fR changes the length of a dynamic string.
-If \fInewLength\fR is less than the string's current length, then
-the string is truncated.
-If \fInewLength\fR is greater than the string's current length,
-then the string will become longer and new space will be allocated
-for the string if needed.
-However, \fBTcl_DStringSetLength\fR will not initialize the new
-space except to provide a terminating null character;  it is up to the
-caller to fill in the new space.
-\fBTcl_DStringSetLength\fR does not free up the string's storage space
-even if the string is truncated to zero length, so \fBTcl_DStringFree\fR
-will still need to be called.
-.PP
-\fBTcl_DStringFree\fR should be called when you're finished using
-the string.  It frees up any memory that was allocated for the string
-and reinitializes the string's value to an empty string.
-.PP
-\fBTcl_DStringResult\fR sets the result of \fIinterp\fR to the value of
-the dynamic string given by \fIdsPtr\fR.  It does this by moving
-a pointer from \fIdsPtr\fR to \fIinterp->result\fR.
-This saves the cost of allocating new memory and copying the string.
-\fBTcl_DStringResult\fR also reinitializes the dynamic string to
-an empty string.
-.PP
-\fBTcl_DStringGetResult\fR does the opposite of \fBTcl_DStringResult\fR.
-It sets the value of \fIdsPtr\fR to the result of \fIinterp\fR and
-it clears \fIinterp\fR's result.
-If possible it does this by moving a pointer rather than by copying
-the string.
-
-.SH KEYWORDS
-append, dynamic string, free, result