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- '\" $Header: /user6/ouster/tcl/man/RCS/DString.3,v 1.10 93/08/16 13:24:52 ouster Exp $ SPRITE (Berkeley)
- '\"
- .\" The definitions below are for supplemental macros used in Tcl/Tk
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- .\" section names.
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- '\" # Heading for Tcl/Tk man pages
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- .HS Tcl_DStringInit tclc 7.0
- .BS
- .SH NAME
- .na
- Tcl_DStringInit, Tcl_DStringAppend, Tcl_DStringAppendElement, Tcl_DStringStartSublist, Tcl_DStringEndSublist, Tcl_DStringLength, Tcl_DStringValue, Tcl_DStringTrunc, Tcl_DStringFree, Tcl_DStringResult \- manipulate dynamic strings
- .ad
- .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_DStringTrunc\fR(\fIdsPtr, newLength\fR)
- .sp
- \fBTcl_DStringFree\fR(\fIdsPtr\fR)
- .sp
- \fBTcl_DStringResult\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.
- .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_DStringAppendElement\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
- \fBTcl_DStringTrunc\fR truncates a dynamic string to a given length.
- It has no effect if the string was already smaller than \fInewLength\fR.
- This procedure 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.
-
- .SH KEYWORDS
- append, dynamic string, free, result
-