2 '\" Copyright (c) 1993 The Regents of the University of California.
3 '\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
5 '\" See the file "license.terms" for information on usage and redistribution
6 '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
8 '\" RCS: @(#) $Id: DString.3,v 1.5 2000/04/14 23:01:50 hobbs Exp $
10 '\" The definitions below are for supplemental macros used in Tcl/Tk
13 '\" .AP type name in/out ?indent?
14 '\" Start paragraph describing an argument to a library procedure.
15 '\" type is type of argument (int, etc.), in/out is either "in", "out",
16 '\" or "in/out" to describe whether procedure reads or modifies arg,
17 '\" and indent is equivalent to second arg of .IP (shouldn't ever be
18 '\" needed; use .AS below instead)
21 '\" Give maximum sizes of arguments for setting tab stops. Type and
22 '\" name are examples of largest possible arguments that will be passed
23 '\" to .AP later. If args are omitted, default tab stops are used.
26 '\" Start box enclosure. From here until next .BE, everything will be
27 '\" enclosed in one large box.
30 '\" End of box enclosure.
33 '\" Begin code excerpt.
38 '\" .VS ?version? ?br?
39 '\" Begin vertical sidebar, for use in marking newly-changed parts
40 '\" of man pages. The first argument is ignored and used for recording
41 '\" the version when the .VS was added, so that the sidebars can be
42 '\" found and removed when they reach a certain age. If another argument
43 '\" is present, then a line break is forced before starting the sidebar.
46 '\" End of vertical sidebar.
49 '\" Begin an indented unfilled display.
52 '\" End of indented unfilled display.
55 '\" Start of list of standard options for a Tk widget. The
56 '\" options follow on successive lines, in four columns separated
60 '\" End of list of standard options for a Tk widget.
62 '\" .OP cmdName dbName dbClass
63 '\" Start of description of a specific option. cmdName gives the
64 '\" option's name as specified in the class command, dbName gives
65 '\" the option's name in the option database, and dbClass gives
66 '\" the option's class in the option database.
69 '\" Print arg1 underlined, then print arg2 normally.
71 '\" RCS: @(#) $Id: man.macros,v 1.3 1999/04/16 00:46:35 stanton Exp $
73 '\" # Set up traps and other miscellaneous stuff for Tcl/Tk man pages.
77 '\" # Start an argument description
81 . ie !"\\$2"" .TP \\n()Cu
86 \&\\$1 \\fI\\$2\\fP (\\$3)
99 '\" # define tabbing values for .AP
102 .if !"\\$1"" .nr )A \\w'\\$1'u+3n
105 .if !"\\$2"" .nr )B \\w'\\$2'u+\\n()Au+3n
106 .nr )C \\n()Bu+\\w'(in/out)'u+2n
108 .AS Tcl_Interp Tcl_CreateInterp in/out
109 '\" # BS - start boxed text
110 '\" # ^y = starting y location
118 .if n \l'\\n(.lu\(ul'
121 '\" # BE - end boxed text (draw box now)
126 .ie n \l'\\n(^lu\(ul'
128 .\" Draw four-sided box normally, but don't draw top of
129 .\" box if the box started on an earlier page.
131 \h'-1.5n'\L'|\\n(^yu-1v'\l'\\n(^lu+3n\(ul'\L'\\n(^tu+1v-\\n(^yu'\l'|0u-1.5n\(ul'
134 \h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\l'|0u-1.5n\(ul'
141 '\" # VS - start vertical sidebar
142 '\" # ^Y = starting y location
143 '\" # ^v = 1 (for troff; for nroff this doesn't matter)
147 .ie n 'mc \s12\(br\s0
150 '\" # VE - end of vertical sidebar
158 \h'|\\n(^lu+3n'\L'|\\n(^Yu-1v\(bv'\v'\\n(^tu+1v-\\n(^Yu'\h'-|\\n(^lu+3n'
165 '\" # Special macro to handle page bottom: finish off current
166 '\" # box/sidebar if in box/sidebar mode, then invoked standard
167 '\" # page bottom macro.
174 .\" Draw three-sided box if this is the box's first page,
175 .\" draw two sides but no top otherwise.
176 .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
177 .el \h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\h'|0u'\c
180 .nr ^x \\n(^tu+1v-\\n(^Yu
181 \kx\h'-\\nxu'\h'|\\n(^lu+3n'\ky\L'-\\n(^xu'\v'\\n(^xu'\h'|0u'\c
194 '\" # DS - begin display
200 '\" # DE - end display
206 '\" # SO - start of list of standard options
208 .SH "STANDARD OPTIONS"
214 '\" # SE - end of list of standard options
219 See the \\fBoptions\\fR manual entry for details on the standard options.
221 '\" # OP - start of full description for a single option
226 Command-Line Name: \\fB\\$1\\fR
227 Database Name: \\fB\\$2\\fR
228 Database Class: \\fB\\$3\\fR
232 '\" # CS - begin code excerpt
238 '\" # CE - end code excerpt
246 .TH Tcl_DString 3 7.4 Tcl "Tcl Library Procedures"
249 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
252 \fB#include <tcl.h>\fR
254 \fBTcl_DStringInit\fR(\fIdsPtr\fR)
257 \fBTcl_DStringAppend\fR(\fIdsPtr, string, length\fR)
260 \fBTcl_DStringAppendElement\fR(\fIdsPtr, string\fR)
262 \fBTcl_DStringStartSublist\fR(\fIdsPtr\fR)
264 \fBTcl_DStringEndSublist\fR(\fIdsPtr\fR)
267 \fBTcl_DStringLength\fR(\fIdsPtr\fR)
270 \fBTcl_DStringValue\fR(\fIdsPtr\fR)
272 \fBTcl_DStringSetLength\fR(\fIdsPtr, newLength\fR)
274 \fBTcl_DStringTrunc\fR(\fIdsPtr, newLength\fR)
276 \fBTcl_DStringFree\fR(\fIdsPtr\fR)
278 \fBTcl_DStringResult\fR(\fIinterp, dsPtr\fR)
280 \fBTcl_DStringGetResult\fR(\fIinterp, dsPtr\fR)
282 .AS Tcl_DString newLength
283 .AP Tcl_DString *dsPtr in/out
284 Pointer to structure that is used to manage a dynamic string.
286 Pointer to characters to add to dynamic string.
288 Number of characters from string to add to dynamic string. If -1,
289 add all characters up to null terminating character.
291 New length for dynamic string, not including null terminating
293 .AP Tcl_Interp *interp in/out
294 Interpreter whose result is to be set from or moved to the
300 Dynamic strings provide a mechanism for building up arbitrarily long
301 strings by gradually appending information. If the dynamic string is
302 short then there will be no memory allocation overhead; as the string
303 gets larger, additional space will be allocated as needed.
305 \fBTcl_DStringInit\fR initializes a dynamic string to zero length.
306 The Tcl_DString structure must have been allocated by the caller.
307 No assumptions are made about the current state of the structure;
308 anything already in it is discarded.
309 If the structure has been used previously, \fBTcl_DStringFree\fR should
310 be called first to free up any memory allocated for the old
313 \fBTcl_DStringAppend\fR adds new information to a dynamic string,
314 allocating more memory for the string if needed.
315 If \fIlength\fR is less than zero then everything in \fIstring\fR
316 is appended to the dynamic string; otherwise \fIlength\fR
317 specifies the number of bytes to append.
318 \fBTcl_DStringAppend\fR returns a pointer to the characters of
319 the new string. The string can also be retrieved from the
320 \fIstring\fR field of the Tcl_DString structure.
322 \fBTcl_DStringAppendElement\fR is similar to \fBTcl_DStringAppend\fR
323 except that it doesn't take a \fIlength\fR argument (it appends
324 all of \fIstring\fR) and it converts the string to a proper list element
326 \fBTcl_DStringAppendElement\fR adds a separator space before the
327 new list element unless the new list element is the first in a
328 list or sub-list (i.e. either the current string is empty, or it
329 contains the single character ``{'', or the last two characters of
330 the current string are `` {'').
331 \fBTcl_DStringAppendElement\fR returns a pointer to the
332 characters of the new string.
334 \fBTcl_DStringStartSublist\fR and \fBTcl_DStringEndSublist\fR can be
335 used to create nested lists.
336 To append a list element that is itself a sublist, first
337 call \fBTcl_DStringStartSublist\fR, then call \fBTcl_DStringAppendElement\fR
338 for each of the elements in the sublist, then call
339 \fBTcl_DStringEndSublist\fR to end the sublist.
340 \fBTcl_DStringStartSublist\fR appends a space character if needed,
341 followed by an open brace; \fBTcl_DStringEndSublist\fR appends
343 Lists can be nested to any depth.
345 \fBTcl_DStringLength\fR is a macro that returns the current length
346 of a dynamic string (not including the terminating null character).
347 \fBTcl_DStringValue\fR is a macro that returns a pointer to the
348 current contents of a dynamic string.
351 \fBTcl_DStringSetLength\fR changes the length of a dynamic string.
352 If \fInewLength\fR is less than the string's current length, then
353 the string is truncated.
354 If \fInewLength\fR is greater than the string's current length,
355 then the string will become longer and new space will be allocated
356 for the string if needed.
357 However, \fBTcl_DStringSetLength\fR will not initialize the new
358 space except to provide a terminating null character; it is up to the
359 caller to fill in the new space.
360 \fBTcl_DStringSetLength\fR does not free up the string's storage space
361 even if the string is truncated to zero length, so \fBTcl_DStringFree\fR
362 will still need to be called.
364 \fBTcl_DStringTrunc\fR changes the length of a dynamic string.
365 This procedure is now deprecated. \fBTcl_DStringSetLength\fR should
368 \fBTcl_DStringFree\fR should be called when you're finished using
369 the string. It frees up any memory that was allocated for the string
370 and reinitializes the string's value to an empty string.
372 \fBTcl_DStringResult\fR sets the result of \fIinterp\fR to the value of
373 the dynamic string given by \fIdsPtr\fR. It does this by moving
374 a pointer from \fIdsPtr\fR to the interpreter's result.
375 This saves the cost of allocating new memory and copying the string.
376 \fBTcl_DStringResult\fR also reinitializes the dynamic string to
379 \fBTcl_DStringGetResult\fR does the opposite of \fBTcl_DStringResult\fR.
380 It sets the value of \fIdsPtr\fR to the result of \fIinterp\fR and
381 it clears \fIinterp\fR's result.
382 If possible it does this by moving a pointer rather than by copying
386 append, dynamic string, free, result