glib/garray.c

   1 /* GLIB - Library of useful routines for C programming
   2  * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 /*
  21  * Modified by the GLib Team and others 1997-2000.  See the AUTHORS
  22  * file for a list of people on the GLib Team.  See the ChangeLog
  23  * files for a list of changes.  These files are distributed with
  24  * GLib at ftp://ftp.gtk.org/pub/gtk/.
  25  */
  26
  27 /*
  28  * MT safe
  29  */
  30
  31 #include "config.h"
  32
  33 #include <string.h>
  34 #include <stdlib.h>
  35 #include "galias.h"
  36 #include "glib.h"
  37
  38
  39 #define MIN_ARRAY_SIZE  16
  40
  41 typedef struct _GRealArray  GRealArray;
  42
  43 struct _GRealArray
  44 {
  45   guint8 *data;
  46   guint   len;
  47   guint   alloc;
  48   guint   elt_size;
  49   guint   zero_terminated : 1;
  50   guint   clear : 1;
  51 };
  52
  53 #define g_array_elt_len(array,i) ((array)->elt_size * (i))
  54 #define g_array_elt_pos(array,i) ((array)->data + g_array_elt_len((array),(i)))
  55 #define g_array_elt_zero(array, pos, len)                               \
  56   (memset (g_array_elt_pos ((array), pos), 0,  g_array_elt_len ((array), len)))
  57 #define g_array_zero_terminate(array) G_STMT_START{                     \
  58   if ((array)->zero_terminated)                                         \
  59     g_array_elt_zero ((array), (array)->len, 1);                        \
  60 }G_STMT_END
  61
  62 static gint g_nearest_pow        (gint        num) G_GNUC_CONST;
  63 static void g_array_maybe_expand (GRealArray *array,
  64                                   gint        len);
  65
  66 static GMemChunk *array_mem_chunk = NULL;
  67 G_LOCK_DEFINE_STATIC (array_mem_chunk);
  68
  69 GArray*
  70 g_array_new (gboolean zero_terminated,
  71              gboolean clear,
  72              guint    elt_size)
  73 {
  74   return (GArray*) g_array_sized_new (zero_terminated, clear, elt_size, 0);
  75 }
  76
  77 GArray* g_array_sized_new (gboolean zero_terminated,
  78                            gboolean clear,
  79                            guint    elt_size,
  80                            guint    reserved_size)
  81 {
  82   GRealArray *array;
  83
  84   G_LOCK (array_mem_chunk);
  85   if (!array_mem_chunk)
  86     array_mem_chunk = g_mem_chunk_new ("array mem chunk",
  87                                        sizeof (GRealArray),
  88                                        1024, G_ALLOC_AND_FREE);
  89
  90   array = g_chunk_new (GRealArray, array_mem_chunk);
  91   G_UNLOCK (array_mem_chunk);
  92
  93   array->data            = NULL;
  94   array->len             = 0;
  95   array->alloc           = 0;
  96   array->zero_terminated = (zero_terminated ? 1 : 0);
  97   array->clear           = (clear ? 1 : 0);
  98   array->elt_size        = elt_size;
  99
 100   if (array->zero_terminated || reserved_size != 0)
 101     {
 102       g_array_maybe_expand (array, reserved_size);
 103       g_array_zero_terminate(array);
 104     }
 105
 106   return (GArray*) array;
 107 }
 108
 109 gchar*
 110 g_array_free (GArray  *array,
 111               gboolean free_segment)
 112 {
 113   gchar* segment;
 114
 115   g_return_val_if_fail (array, NULL);
 116
 117   if (free_segment)
 118     {
 119       g_free (array->data);
 120       segment = NULL;
 121     }
 122   else
 123     segment = array->data;
 124
 125   G_LOCK (array_mem_chunk);
 126   g_mem_chunk_free (array_mem_chunk, array);
 127   G_UNLOCK (array_mem_chunk);
 128
 129   return segment;
 130 }
 131
 132 GArray*
 133 g_array_append_vals (GArray       *farray,
 134                      gconstpointer data,
 135                      guint         len)
 136 {
 137   GRealArray *array = (GRealArray*) farray;
 138
 139   g_array_maybe_expand (array, len);
 140
 141   memcpy (g_array_elt_pos (array, array->len), data,
 142           g_array_elt_len (array, len));
 143
 144   array->len += len;
 145
 146   g_array_zero_terminate (array);
 147
 148   return farray;
 149 }
 150
 151 GArray*
 152 g_array_prepend_vals (GArray        *farray,
 153                       gconstpointer  data,
 154                       guint          len)
 155 {
 156   GRealArray *array = (GRealArray*) farray;
 157
 158   g_array_maybe_expand (array, len);
 159
 160   g_memmove (g_array_elt_pos (array, len), g_array_elt_pos (array, 0),
 161              g_array_elt_len (array, array->len));
 162
 163   memcpy (g_array_elt_pos (array, 0), data, g_array_elt_len (array, len));
 164
 165   array->len += len;
 166
 167   g_array_zero_terminate (array);
 168
 169   return farray;
 170 }
 171
 172 GArray*
 173 g_array_insert_vals (GArray        *farray,
 174                      guint          index,
 175                      gconstpointer  data,
 176                      guint          len)
 177 {
 178   GRealArray *array = (GRealArray*) farray;
 179
 180   g_array_maybe_expand (array, len);
 181
 182   g_memmove (g_array_elt_pos (array, len + index),
 183              g_array_elt_pos (array, index),
 184              g_array_elt_len (array, array->len - index));
 185
 186   memcpy (g_array_elt_pos (array, index), data, g_array_elt_len (array, len));
 187
 188   array->len += len;
 189
 190   g_array_zero_terminate (array);
 191
 192   return farray;
 193 }
 194
 195 GArray*
 196 g_array_set_size (GArray *farray,
 197                   guint   length)
 198 {
 199   GRealArray *array = (GRealArray*) farray;
 200   if (length > array->len)
 201     {
 202       g_array_maybe_expand (array, length - array->len);
 203
 204       if (array->clear)
 205         g_array_elt_zero (array, array->len, length - array->len);
 206     }
 207 #ifdef ENABLE_GC_FRIENDLY
 208   else if (length < array->len)
 209     g_array_elt_zero (array, length, array->len - length);
 210 #endif /* ENABLE_GC_FRIENDLY */
 211
 212   array->len = length;
 213
 214   g_array_zero_terminate (array);
 215
 216   return farray;
 217 }
 218
 219 GArray*
 220 g_array_remove_index (GArray* farray,
 221                       guint index)
 222 {
 223   GRealArray* array = (GRealArray*) farray;
 224
 225   g_return_val_if_fail (array, NULL);
 226
 227   g_return_val_if_fail (index < array->len, NULL);
 228
 229   if (index != array->len - 1)
 230     g_memmove (g_array_elt_pos (array, index),
 231                g_array_elt_pos (array, index + 1),
 232                g_array_elt_len (array, array->len - index - 1));
 233
 234   array->len -= 1;
 235
 236 #ifdef ENABLE_GC_FRIENDLY
 237   g_array_elt_zero (array, array->len, 1);
 238 #else /* !ENABLE_GC_FRIENDLY */
 239   g_array_zero_terminate (array);
 240 #endif /* ENABLE_GC_FRIENDLY */
 241
 242   return farray;
 243 }
 244
 245 GArray*
 246 g_array_remove_index_fast (GArray* farray,
 247                            guint   index)
 248 {
 249   GRealArray* array = (GRealArray*) farray;
 250
 251   g_return_val_if_fail (array, NULL);
 252
 253   g_return_val_if_fail (index < array->len, NULL);
 254
 255   if (index != array->len - 1)
 256     memcpy (g_array_elt_pos (array, index),
 257             g_array_elt_pos (array, array->len - 1),
 258             g_array_elt_len (array, 1));
 259
 260   array->len -= 1;
 261
 262 #ifdef ENABLE_GC_FRIENDLY
 263   g_array_elt_zero (array, array->len, 1);
 264 #else /* !ENABLE_GC_FRIENDLY */
 265   g_array_zero_terminate (array);
 266 #endif /* ENABLE_GC_FRIENDLY */
 267
 268   return farray;
 269 }
 270
 271 GArray*
 272 g_array_remove_range (GArray       *farray,
 273                       guint         index_,
 274                       guint         length)
 275 {
 276   GRealArray *array = (GRealArray*) farray;
 277
 278   g_return_val_if_fail (array, NULL);
 279   g_return_val_if_fail (index_ < array->len, NULL);
 280   g_return_val_if_fail (index_ + length <= array->len, NULL);
 281
 282   if (index_ + length != array->len)
 283     g_memmove (g_array_elt_pos (array, index_),
 284                g_array_elt_pos (array, index_ + length),
 285                (array->len - (index_ + length)) * array->elt_size);
 286
 287   array->len -= length;
 288 #ifdef ENABLE_GC_FRIENDLY
 289   g_array_elt_zero (array, array->len, length);
 290 #else /* !ENABLE_GC_FRIENDLY */
 291   g_array_zero_terminate (array);
 292 #endif /* ENABLE_GC_FRIENDLY */
 293
 294   return farray;
 295 }
 296
 297 void
 298 g_array_sort (GArray       *farray,
 299               GCompareFunc  compare_func)
 300 {
 301   GRealArray *array = (GRealArray*) farray;
 302
 303   g_return_if_fail (array != NULL);
 304
 305   qsort (array->data,
 306          array->len,
 307          array->elt_size,
 308          compare_func);
 309 }
 310
 311 void
 312 g_array_sort_with_data (GArray           *farray,
 313                         GCompareDataFunc  compare_func,
 314                         gpointer          user_data)
 315 {
 316   GRealArray *array = (GRealArray*) farray;
 317
 318   g_return_if_fail (array != NULL);
 319
 320   g_qsort_with_data (array->data,
 321                      array->len,
 322                      array->elt_size,
 323                      compare_func,
 324                      user_data);
 325 }
 326
 327
 328 static gint
 329 g_nearest_pow (gint num)
 330 {
 331   gint n = 1;
 332
 333   while (n < num)
 334     n <<= 1;
 335
 336   return n;
 337 }
 338
 339 static void
 340 g_array_maybe_expand (GRealArray *array,
 341                       gint        len)
 342 {
 343   guint want_alloc = g_array_elt_len (array, array->len + len +
 344                                       array->zero_terminated);
 345
 346   if (want_alloc > array->alloc)
 347     {
 348       want_alloc = g_nearest_pow (want_alloc);
 349       want_alloc = MAX (want_alloc, MIN_ARRAY_SIZE);
 350
 351       array->data = g_realloc (array->data, want_alloc);
 352
 353 #ifdef ENABLE_GC_FRIENDLY
 354       memset (array->data + array->alloc, 0, want_alloc - array->alloc);
 355 #endif /* ENABLE_GC_FRIENDLY */
 356
 357       array->alloc = want_alloc;
 358     }
 359 }
 360
 361 /* Pointer Array
 362  */
 363
 364 typedef struct _GRealPtrArray  GRealPtrArray;
 365
 366 struct _GRealPtrArray
 367 {
 368   gpointer *pdata;
 369   guint     len;
 370   guint     alloc;
 371 };
 372
 373 static void g_ptr_array_maybe_expand (GRealPtrArray *array,
 374                                       gint           len);
 375
 376 static GMemChunk *ptr_array_mem_chunk = NULL;
 377 G_LOCK_DEFINE_STATIC (ptr_array_mem_chunk);
 378
 379
 380 GPtrArray*
 381 g_ptr_array_new (void)
 382 {
 383   return g_ptr_array_sized_new (0);
 384 }
 385
 386 GPtrArray*
 387 g_ptr_array_sized_new (guint reserved_size)
 388 {
 389   GRealPtrArray *array;
 390
 391   G_LOCK (ptr_array_mem_chunk);
 392   if (!ptr_array_mem_chunk)
 393     ptr_array_mem_chunk = g_mem_chunk_new ("array mem chunk",
 394                                            sizeof (GRealPtrArray),
 395                                            1024, G_ALLOC_AND_FREE);
 396
 397   array = g_chunk_new (GRealPtrArray, ptr_array_mem_chunk);
 398   G_UNLOCK (ptr_array_mem_chunk);
 399
 400   array->pdata = NULL;
 401   array->len = 0;
 402   array->alloc = 0;
 403
 404   if (reserved_size != 0)
 405     g_ptr_array_maybe_expand (array, reserved_size);
 406
 407   return (GPtrArray*) array;
 408 }
 409
 410 gpointer*
 411 g_ptr_array_free (GPtrArray   *array,
 412                   gboolean  free_segment)
 413 {
 414   gpointer* segment;
 415
 416   g_return_val_if_fail (array, NULL);
 417
 418   if (free_segment)
 419     {
 420       g_free (array->pdata);
 421       segment = NULL;
 422     }
 423   else
 424     segment = array->pdata;
 425
 426   G_LOCK (ptr_array_mem_chunk);
 427   g_mem_chunk_free (ptr_array_mem_chunk, array);
 428   G_UNLOCK (ptr_array_mem_chunk);
 429
 430   return segment;
 431 }
 432
 433 static void
 434 g_ptr_array_maybe_expand (GRealPtrArray *array,
 435                           gint        len)
 436 {
 437   if ((array->len + len) > array->alloc)
 438     {
 439 #ifdef ENABLE_GC_FRIENDLY
 440       guint old_alloc = array->alloc;
 441 #endif /* ENABLE_GC_FRIENDLY */
 442       array->alloc = g_nearest_pow (array->len + len);
 443       array->alloc = MAX (array->alloc, MIN_ARRAY_SIZE);
 444       array->pdata = g_realloc (array->pdata, sizeof (gpointer) * array->alloc);
 445 #ifdef ENABLE_GC_FRIENDLY
 446       for ( ; old_alloc < array->alloc; old_alloc++)
 447         array->pdata [old_alloc] = NULL;
 448 #endif /* ENABLE_GC_FRIENDLY */
 449     }
 450 }
 451
 452 void
 453 g_ptr_array_set_size  (GPtrArray   *farray,
 454                        gint          length)
 455 {
 456   GRealPtrArray* array = (GRealPtrArray*) farray;
 457
 458   g_return_if_fail (array);
 459
 460   if (length > array->len)
 461     {
 462       int i;
 463       g_ptr_array_maybe_expand (array, (length - array->len));
 464       /* This is not
 465        *     memset (array->pdata + array->len, 0,
 466        *            sizeof (gpointer) * (length - array->len));
 467        * to make it really portable. Remember (void*)NULL needn't be
 468        * bitwise zero. It of course is silly not to use memset (..,0,..).
 469        */
 470       for (i = array->len; i < length; i++)
 471         array->pdata[i] = NULL;
 472     }
 473 #ifdef ENABLE_GC_FRIENDLY
 474   else if (length < array->len)
 475     {
 476       int i;
 477       for (i = length; i < array->len; i++)
 478         array->pdata[i] = NULL;
 479     }
 480 #endif /* ENABLE_GC_FRIENDLY */
 481
 482   array->len = length;
 483 }
 484
 485 gpointer
 486 g_ptr_array_remove_index (GPtrArray* farray,
 487                           guint      index)
 488 {
 489   GRealPtrArray* array = (GRealPtrArray*) farray;
 490   gpointer result;
 491
 492   g_return_val_if_fail (array, NULL);
 493
 494   g_return_val_if_fail (index < array->len, NULL);
 495
 496   result = array->pdata[index];
 497
 498   if (index != array->len - 1)
 499     g_memmove (array->pdata + index, array->pdata + index + 1,
 500                sizeof (gpointer) * (array->len - index - 1));
 501
 502   array->len -= 1;
 503
 504 #ifdef ENABLE_GC_FRIENDLY
 505   array->pdata[array->len] = NULL;
 506 #endif /* ENABLE_GC_FRIENDLY */
 507
 508   return result;
 509 }
 510
 511 gpointer
 512 g_ptr_array_remove_index_fast (GPtrArray* farray,
 513                                guint      index)
 514 {
 515   GRealPtrArray* array = (GRealPtrArray*) farray;
 516   gpointer result;
 517
 518   g_return_val_if_fail (array, NULL);
 519
 520   g_return_val_if_fail (index < array->len, NULL);
 521
 522   result = array->pdata[index];
 523
 524   if (index != array->len - 1)
 525     array->pdata[index] = array->pdata[array->len - 1];
 526
 527   array->len -= 1;
 528
 529 #ifdef ENABLE_GC_FRIENDLY
 530   array->pdata[array->len] = NULL;
 531 #endif /* ENABLE_GC_FRIENDLY */
 532
 533   return result;
 534 }
 535
 536 void
 537 g_ptr_array_remove_range (GPtrArray* farray,
 538                           guint      index_,
 539                           guint      length)
 540 {
 541   GRealPtrArray* array = (GRealPtrArray*) farray;
 542
 543   g_return_if_fail (array);
 544   g_return_if_fail (index_ < array->len);
 545   g_return_if_fail (index_ + length <= array->len);
 546
 547   if (index_ + length != array->len)
 548     g_memmove (&array->pdata[index_],
 549                &array->pdata[index_ + length],
 550                (array->len - (index_ + length)) * sizeof (gpointer));
 551
 552   array->len -= length;
 553 #ifdef ENABLE_GC_FRIENDLY
 554   {
 555     guint i;
 556     for (i = 0; i < length; i++)
 557       array->pdata[array->len + i] = NULL;
 558   }
 559 #endif /* ENABLE_GC_FRIENDLY */
 560 }
 561
 562 gboolean
 563 g_ptr_array_remove (GPtrArray* farray,
 564                     gpointer data)
 565 {
 566   GRealPtrArray* array = (GRealPtrArray*) farray;
 567   guint i;
 568
 569   g_return_val_if_fail (array, FALSE);
 570
 571   for (i = 0; i < array->len; i += 1)
 572     {
 573       if (array->pdata[i] == data)
 574         {
 575           g_ptr_array_remove_index (farray, i);
 576           return TRUE;
 577         }
 578     }
 579
 580   return FALSE;
 581 }
 582
 583 gboolean
 584 g_ptr_array_remove_fast (GPtrArray* farray,
 585                          gpointer data)
 586 {
 587   GRealPtrArray* array = (GRealPtrArray*) farray;
 588   guint i;
 589
 590   g_return_val_if_fail (array, FALSE);
 591
 592   for (i = 0; i < array->len; i += 1)
 593     {
 594       if (array->pdata[i] == data)
 595         {
 596           g_ptr_array_remove_index_fast (farray, i);
 597           return TRUE;
 598         }
 599     }
 600
 601   return FALSE;
 602 }
 603
 604 void
 605 g_ptr_array_add (GPtrArray* farray,
 606                  gpointer data)
 607 {
 608   GRealPtrArray* array = (GRealPtrArray*) farray;
 609
 610   g_return_if_fail (array);
 611
 612   g_ptr_array_maybe_expand (array, 1);
 613
 614   array->pdata[array->len++] = data;
 615 }
 616
 617 void
 618 g_ptr_array_sort (GPtrArray    *array,
 619                   GCompareFunc  compare_func)
 620 {
 621   g_return_if_fail (array != NULL);
 622
 623   qsort (array->pdata,
 624          array->len,
 625          sizeof (gpointer),
 626          compare_func);
 627 }
 628
 629 void
 630 g_ptr_array_sort_with_data (GPtrArray        *array,
 631                             GCompareDataFunc  compare_func,
 632                             gpointer          user_data)
 633 {
 634   g_return_if_fail (array != NULL);
 635
 636   g_qsort_with_data (array->pdata,
 637                      array->len,
 638                      sizeof (gpointer),
 639                      compare_func,
 640                      user_data);
 641 }
 642
 643 /**
 644  * g_ptr_array_foreach:
 645  * @array: a #GPtrArray
 646  * @func: the function to call for each array element
 647  * @user_data: user data to pass to the function
 648  *
 649  * Calls a function for each element of a #GPtrArray.
 650  *
 651  * Since: 2.4
 652  **/
 653 void
 654 g_ptr_array_foreach (GPtrArray *array,
 655                      GFunc      func,
 656                      gpointer   user_data)
 657 {
 658   guint i;
 659
 660   g_return_if_fail (array);
 661
 662   for (i = 0; i < array->len; i++)
 663     (*func) (array->pdata[i], user_data);
 664 }
 665
 666 /* Byte arrays
 667  */
 668
 669 GByteArray* g_byte_array_new      (void)
 670 {
 671   return (GByteArray*) g_array_sized_new (FALSE, FALSE, 1, 0);
 672 }
 673
 674 GByteArray* g_byte_array_sized_new (guint reserved_size)
 675 {
 676   return (GByteArray*) g_array_sized_new (FALSE, FALSE, 1, reserved_size);
 677 }
 678
 679 guint8*     g_byte_array_free     (GByteArray *array,
 680                                    gboolean    free_segment)
 681 {
 682   return (guint8*) g_array_free ((GArray*) array, free_segment);
 683 }
 684
 685 GByteArray* g_byte_array_append   (GByteArray *array,
 686                                    const guint8 *data,
 687                                    guint       len)
 688 {
 689   g_array_append_vals ((GArray*) array, (guint8*)data, len);
 690
 691   return array;
 692 }
 693
 694 GByteArray* g_byte_array_prepend  (GByteArray *array,
 695                                    const guint8 *data,
 696                                    guint       len)
 697 {
 698   g_array_prepend_vals ((GArray*) array, (guint8*)data, len);
 699
 700   return array;
 701 }
 702
 703 GByteArray* g_byte_array_set_size (GByteArray *array,
 704                                    guint       length)
 705 {
 706   g_array_set_size ((GArray*) array, length);
 707
 708   return array;
 709 }
 710
 711 GByteArray* g_byte_array_remove_index (GByteArray *array,
 712                                        guint index)
 713 {
 714   g_array_remove_index((GArray*) array, index);
 715
 716   return array;
 717 }
 718
 719 GByteArray* g_byte_array_remove_index_fast (GByteArray *array,
 720                                             guint index)
 721 {
 722   g_array_remove_index_fast((GArray*) array, index);
 723
 724   return array;
 725 }
 726
 727 GByteArray*
 728 g_byte_array_remove_range (GByteArray *array,
 729                            guint index_,
 730                            guint length)
 731 {
 732   g_return_val_if_fail (array, NULL);
 733   g_return_val_if_fail (index_ < array->len, NULL);
 734   g_return_val_if_fail (index_ + length <= array->len, NULL);
 735
 736   return (GByteArray *)g_array_remove_range ((GArray*) array, index_, length);
 737 }
 738
 739 void
 740 g_byte_array_sort (GByteArray   *array,
 741                    GCompareFunc  compare_func)
 742 {
 743   g_array_sort ((GArray *) array, compare_func);
 744 }
 745
 746 void
 747 g_byte_array_sort_with_data (GByteArray       *array,
 748                              GCompareDataFunc  compare_func,
 749                              gpointer          user_data)
 750 {
 751   g_array_sort_with_data ((GArray *) array, compare_func, user_data);
 752 }