| 1 | '\" |
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| 9 | '\" |
| 10 | '\" The definitions below are for supplemental macros used in Tcl/Tk |
| 11 | '\" manual entries. |
| 12 | '\" |
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| 71 | '\" RCS: @(#) $Id: man.macros,v 1.4 2000/08/25 06:18:32 ericm Exp $ |
| 72 | '\" |
| 73 | '\" # Set up traps and other miscellaneous stuff for Tcl/Tk man pages. |
| 74 | .if t .wh -1.3i ^B |
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| 206 | '\" # SO - start of list of standard options |
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| 208 | .SH "STANDARD OPTIONS" |
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| 219 | See the \\fBoptions\\fR manual entry for details on the standard options. |
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| 226 | Command-Line Name: \\fB\\$1\\fR |
| 227 | Database Name: \\fB\\$2\\fR |
| 228 | Database Class: \\fB\\$3\\fR |
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| 245 | .. |
| 246 | .TH Tcl_DString 3 7.4 Tcl "Tcl Library Procedures" |
| 247 | .BS |
| 248 | .SH NAME |
| 249 | Tcl_DStringInit, Tcl_DStringAppend, Tcl_DStringAppendElement, Tcl_DStringStartSublist, Tcl_DStringEndSublist, Tcl_DStringLength, Tcl_DStringValue, Tcl_DStringSetLength, Tcl_DStringTrunc, Tcl_DStringFree, Tcl_DStringResult, Tcl_DStringGetResult \- manipulate dynamic strings |
| 250 | .SH SYNOPSIS |
| 251 | .nf |
| 252 | \fB#include <tcl.h>\fR |
| 253 | .sp |
| 254 | \fBTcl_DStringInit\fR(\fIdsPtr\fR) |
| 255 | .sp |
| 256 | char * |
| 257 | \fBTcl_DStringAppend\fR(\fIdsPtr, string, length\fR) |
| 258 | .sp |
| 259 | char * |
| 260 | \fBTcl_DStringAppendElement\fR(\fIdsPtr, string\fR) |
| 261 | .sp |
| 262 | \fBTcl_DStringStartSublist\fR(\fIdsPtr\fR) |
| 263 | .sp |
| 264 | \fBTcl_DStringEndSublist\fR(\fIdsPtr\fR) |
| 265 | .sp |
| 266 | int |
| 267 | \fBTcl_DStringLength\fR(\fIdsPtr\fR) |
| 268 | .sp |
| 269 | char * |
| 270 | \fBTcl_DStringValue\fR(\fIdsPtr\fR) |
| 271 | .sp |
| 272 | \fBTcl_DStringSetLength\fR(\fIdsPtr, newLength\fR) |
| 273 | .sp |
| 274 | \fBTcl_DStringTrunc\fR(\fIdsPtr, newLength\fR) |
| 275 | .sp |
| 276 | \fBTcl_DStringFree\fR(\fIdsPtr\fR) |
| 277 | .sp |
| 278 | \fBTcl_DStringResult\fR(\fIinterp, dsPtr\fR) |
| 279 | .sp |
| 280 | \fBTcl_DStringGetResult\fR(\fIinterp, dsPtr\fR) |
| 281 | .SH ARGUMENTS |
| 282 | .AS Tcl_DString newLength |
| 283 | .AP Tcl_DString *dsPtr in/out |
| 284 | Pointer to structure that is used to manage a dynamic string. |
| 285 | .AP "CONST char" *string in |
| 286 | Pointer to characters to add to dynamic string. |
| 287 | .AP int length in |
| 288 | Number of characters from string to add to dynamic string. If -1, |
| 289 | add all characters up to null terminating character. |
| 290 | .AP int newLength in |
| 291 | New length for dynamic string, not including null terminating |
| 292 | character. |
| 293 | .AP Tcl_Interp *interp in/out |
| 294 | Interpreter whose result is to be set from or moved to the |
| 295 | dynamic string. |
| 296 | .BE |
| 297 | |
| 298 | .SH DESCRIPTION |
| 299 | .PP |
| 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. |
| 304 | .PP |
| 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 |
| 311 | string. |
| 312 | .PP |
| 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. |
| 321 | .PP |
| 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 |
| 325 | before appending. |
| 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. |
| 333 | .PP |
| 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 |
| 342 | a close brace. |
| 343 | Lists can be nested to any depth. |
| 344 | .PP |
| 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. |
| 349 | .PP |
| 350 | .PP |
| 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. |
| 363 | .PP |
| 364 | \fBTcl_DStringTrunc\fR changes the length of a dynamic string. |
| 365 | This procedure is now deprecated. \fBTcl_DStringSetLength\fR should |
| 366 | be used instead. |
| 367 | .PP |
| 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. |
| 371 | .PP |
| 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 |
| 377 | an empty string. |
| 378 | .PP |
| 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 |
| 383 | the string. |
| 384 | |
| 385 | .SH KEYWORDS |
| 386 | append, dynamic string, free, result |