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 #ifdef HAVE_CONFIG_H
  32 #include <config.h>
  33 #endif
  34
  35 #include <string.h>
  36 #include <stdlib.h>
  37 #include "glib.h"
  38
  39
  40 #define MIN_ARRAY_SIZE  16
  41
  42 typedef struct _GRealArray  GRealArray;
  43
  44 struct _GRealArray
  45 {
  46   guint8 *data;
  47   guint   len;
  48   guint   alloc;
  49   guint   elt_size;
  50   guint   zero_terminated : 1;
  51   guint   clear : 1;
  52 };
  53
  54 #define g_array_elt_len(array,i) ((array)->elt_size * (i))
  55 #define g_array_elt_pos(array,i) ((array)->data + g_array_elt_len((array),(i)))
  56 #define g_array_elt_zero(array, pos, len)                               \
  57   (memset (g_array_elt_pos ((array), pos), 0,  g_array_elt_len ((array), len)))
  58 #define g_array_zero_terminate(array) G_STMT_START{                     \
  59   if ((array)->zero_terminated)                                         \
  60     g_array_elt_zero ((array), (array)->len, 1);                        \
  61 }G_STMT_END
  62
  63 static gint g_nearest_pow        (gint        num) G_GNUC_CONST;
  64 static void g_array_maybe_expand (GRealArray *array,
  65                                   gint        len);
  66
  67 static GMemChunk *array_mem_chunk = NULL;
  68 G_LOCK_DEFINE_STATIC (array_mem_chunk);
  69
  70 GArray*
  71 g_array_new (gboolean zero_terminated,
  72              gboolean clear,
  73              guint    elt_size)
  74 {
  75   return (GArray*) g_array_sized_new (zero_terminated, clear, elt_size, 0);
  76 }
  77
  78 GArray* g_array_sized_new (gboolean zero_terminated,
  79                            gboolean clear,
  80                            guint    elt_size,
  81                            guint    reserved_size)
  82 {
  83   GRealArray *array;
  84
  85   G_LOCK (array_mem_chunk);
  86   if (!array_mem_chunk)
  87     array_mem_chunk = g_mem_chunk_new ("array mem chunk",
  88                                        sizeof (GRealArray),
  89                                        1024, G_ALLOC_AND_FREE);
  90
  91   array = g_chunk_new (GRealArray, array_mem_chunk);
  92   G_UNLOCK (array_mem_chunk);
  93
  94   array->data            = NULL;
  95   array->len             = 0;
  96   array->alloc           = 0;
  97   array->zero_terminated = (zero_terminated ? 1 : 0);
  98   array->clear           = (clear ? 1 : 0);
  99   array->elt_size        = elt_size;
 100
 101   if (array->zero_terminated || reserved_size != 0)
 102     {
 103       g_array_maybe_expand (array, reserved_size);
 104       g_array_zero_terminate(array);
 105     }
 106
 107   return (GArray*) array;
 108 }
 109
 110 gchar*
 111 g_array_free (GArray  *array,
 112               gboolean free_segment)
 113 {
 114   gchar* segment;
 115
 116   g_return_val_if_fail (array, NULL);
 117
 118   if (free_segment)
 119     {
 120       g_free (array->data);
 121       segment = NULL;
 122     }
 123   else
 124     segment = array->data;
 125
 126   G_LOCK (array_mem_chunk);
 127   g_mem_chunk_free (array_mem_chunk, array);
 128   G_UNLOCK (array_mem_chunk);
 129
 130   return segment;
 131 }
 132
 133 GArray*
 134 g_array_append_vals (GArray       *farray,
 135                      gconstpointer data,
 136                      guint         len)
 137 {
 138   GRealArray *array = (GRealArray*) farray;
 139
 140   g_array_maybe_expand (array, len);
 141
 142   memcpy (g_array_elt_pos (array, array->len), data,
 143           g_array_elt_len (array, len));
 144
 145   array->len += len;
 146
 147   g_array_zero_terminate (array);
 148
 149   return farray;
 150 }
 151
 152 GArray*
 153 g_array_prepend_vals (GArray        *farray,
 154                       gconstpointer  data,
 155                       guint          len)
 156 {
 157   GRealArray *array = (GRealArray*) farray;
 158
 159   g_array_maybe_expand (array, len);
 160
 161   g_memmove (g_array_elt_pos (array, len), g_array_elt_pos (array, 0),
 162              g_array_elt_len (array, array->len));
 163
 164   memcpy (g_array_elt_pos (array, 0), data, g_array_elt_len (array, len));
 165
 166   array->len += len;
 167
 168   g_array_zero_terminate (array);
 169
 170   return farray;
 171 }
 172
 173 GArray*
 174 g_array_insert_vals (GArray        *farray,
 175                      guint          index,
 176                      gconstpointer  data,
 177                      guint          len)
 178 {
 179   GRealArray *array = (GRealArray*) farray;
 180
 181   g_array_maybe_expand (array, len);
 182
 183   g_memmove (g_array_elt_pos (array, len + index),
 184              g_array_elt_pos (array, index),
 185              g_array_elt_len (array, array->len - index));
 186
 187   memcpy (g_array_elt_pos (array, index), data, g_array_elt_len (array, len));
 188
 189   array->len += len;
 190
 191   g_array_zero_terminate (array);
 192
 193   return farray;
 194 }
 195
 196 GArray*
 197 g_array_set_size (GArray *farray,
 198                   guint   length)
 199 {
 200   GRealArray *array = (GRealArray*) farray;
 201   if (length > array->len)
 202     {
 203       g_array_maybe_expand (array, length - array->len);
 204
 205       if (array->clear)
 206         g_array_elt_zero (array, array->len, length - array->len);
 207     }
 208 #ifdef ENABLE_GC_FRIENDLY
 209   else if (length < array->len)
 210     g_array_elt_zero (array, length, array->len - length);
 211 #endif /* ENABLE_GC_FRIENDLY */
 212
 213   array->len = length;
 214
 215   g_array_zero_terminate (array);
 216
 217   return farray;
 218 }
 219
 220 GArray*
 221 g_array_remove_index (GArray* farray,
 222                       guint index)
 223 {
 224   GRealArray* array = (GRealArray*) farray;
 225
 226   g_return_val_if_fail (array, NULL);
 227
 228   g_return_val_if_fail (index < array->len, NULL);
 229
 230   if (index != array->len - 1)
 231     g_memmove (g_array_elt_pos (array, index),
 232                g_array_elt_pos (array, index + 1),
 233                g_array_elt_len (array, array->len - index - 1));
 234
 235   array->len -= 1;
 236
 237 #ifdef ENABLE_GC_FRIENDLY
 238   g_array_elt_zero (array, array->len, 1);
 239 #else /* !ENABLE_GC_FRIENDLY */
 240   g_array_zero_terminate (array);
 241 #endif /* ENABLE_GC_FRIENDLY */
 242
 243   return farray;
 244 }
 245
 246 GArray*
 247 g_array_remove_index_fast (GArray* farray,
 248                            guint   index)
 249 {
 250   GRealArray* array = (GRealArray*) farray;
 251
 252   g_return_val_if_fail (array, NULL);
 253
 254   g_return_val_if_fail (index < array->len, NULL);
 255
 256   if (index != array->len - 1)
 257     g_memmove (g_array_elt_pos (array, index),
 258                g_array_elt_pos (array, array->len - 1),
 259                g_array_elt_len (array, 1));
 260
 261   array->len -= 1;
 262
 263 #ifdef ENABLE_GC_FRIENDLY
 264   g_array_elt_zero (array, array->len, 1);
 265 #else /* !ENABLE_GC_FRIENDLY */
 266   g_array_zero_terminate (array);
 267 #endif /* ENABLE_GC_FRIENDLY */
 268
 269   return farray;
 270 }
 271
 272 void
 273 g_array_sort (GArray       *farray,
 274               GCompareFunc  compare_func)
 275 {
 276   GRealArray *array = (GRealArray*) farray;
 277
 278   g_return_if_fail (array != NULL);
 279   g_return_if_fail (array->data != NULL);
 280
 281   qsort (array->data,
 282          array->len,
 283          array->elt_size,
 284          compare_func);
 285 }
 286
 287 void
 288 g_array_sort_with_data (GArray           *farray,
 289                         GCompareDataFunc  compare_func,
 290                         gpointer          user_data)
 291 {
 292   GRealArray *array = (GRealArray*) farray;
 293
 294   g_return_if_fail (array != NULL);
 295   g_return_if_fail (array->data != NULL);
 296
 297   g_qsort_with_data (array->data,
 298                      array->len,
 299                      array->elt_size,
 300                      compare_func,
 301                      user_data);
 302 }
 303
 304
 305 static gint
 306 g_nearest_pow (gint num)
 307 {
 308   gint n = 1;
 309
 310   while (n < num)
 311     n <<= 1;
 312
 313   return n;
 314 }
 315
 316 static void
 317 g_array_maybe_expand (GRealArray *array,
 318                       gint        len)
 319 {
 320   guint want_alloc = g_array_elt_len (array, array->len + len +
 321                                       array->zero_terminated);
 322
 323   if (want_alloc > array->alloc)
 324     {
 325       want_alloc = g_nearest_pow (want_alloc);
 326       want_alloc = MAX (want_alloc, MIN_ARRAY_SIZE);
 327
 328       array->data = g_realloc (array->data, want_alloc);
 329
 330 #ifdef ENABLE_GC_FRIENDLY
 331       memset (array->data + array->alloc, 0, want_alloc - array->alloc);
 332 #endif /* ENABLE_GC_FRIENDLY */
 333
 334       array->alloc = want_alloc;
 335     }
 336 }
 337
 338 /* Pointer Array
 339  */
 340
 341 typedef struct _GRealPtrArray  GRealPtrArray;
 342
 343 struct _GRealPtrArray
 344 {
 345   gpointer *pdata;
 346   guint     len;
 347   guint     alloc;
 348 };
 349
 350 static void g_ptr_array_maybe_expand (GRealPtrArray *array,
 351                                       gint           len);
 352
 353 static GMemChunk *ptr_array_mem_chunk = NULL;
 354 G_LOCK_DEFINE_STATIC (ptr_array_mem_chunk);
 355
 356
 357 GPtrArray*
 358 g_ptr_array_new (void)
 359 {
 360   return g_ptr_array_sized_new (0);
 361 }
 362
 363 GPtrArray*
 364 g_ptr_array_sized_new (guint reserved_size)
 365 {
 366   GRealPtrArray *array;
 367
 368   G_LOCK (ptr_array_mem_chunk);
 369   if (!ptr_array_mem_chunk)
 370     ptr_array_mem_chunk = g_mem_chunk_new ("array mem chunk",
 371                                            sizeof (GRealPtrArray),
 372                                            1024, G_ALLOC_AND_FREE);
 373
 374   array = g_chunk_new (GRealPtrArray, ptr_array_mem_chunk);
 375   G_UNLOCK (ptr_array_mem_chunk);
 376
 377   array->pdata = NULL;
 378   array->len = 0;
 379   array->alloc = 0;
 380
 381   if (reserved_size != 0)
 382     g_ptr_array_maybe_expand (array, reserved_size);
 383
 384   return (GPtrArray*) array;
 385 }
 386
 387 gpointer*
 388 g_ptr_array_free (GPtrArray   *array,
 389                   gboolean  free_segment)
 390 {
 391   gpointer* segment;
 392
 393   g_return_val_if_fail (array, NULL);
 394
 395   if (free_segment)
 396     {
 397       g_free (array->pdata);
 398       segment = NULL;
 399     }
 400   else
 401     segment = array->pdata;
 402
 403   G_LOCK (ptr_array_mem_chunk);
 404   g_mem_chunk_free (ptr_array_mem_chunk, array);
 405   G_UNLOCK (ptr_array_mem_chunk);
 406
 407   return segment;
 408 }
 409
 410 static void
 411 g_ptr_array_maybe_expand (GRealPtrArray *array,
 412                           gint        len)
 413 {
 414   if ((array->len + len) > array->alloc)
 415     {
 416 #ifdef ENABLE_GC_FRIENDLY
 417       guint old_alloc = array->alloc;
 418 #endif /* ENABLE_GC_FRIENDLY */
 419       array->alloc = g_nearest_pow (array->len + len);
 420       array->alloc = MAX (array->alloc, MIN_ARRAY_SIZE);
 421       array->pdata = g_realloc (array->pdata, sizeof(gpointer) * array->alloc);
 422 #ifdef ENABLE_GC_FRIENDLY
 423       for ( ; old_alloc < array->alloc; old_alloc++)
 424         array->pdata [old_alloc] = NULL;
 425 #endif /* ENABLE_GC_FRIENDLY */
 426     }
 427 }
 428
 429 void
 430 g_ptr_array_set_size  (GPtrArray   *farray,
 431                        gint          length)
 432 {
 433   GRealPtrArray* array = (GRealPtrArray*) farray;
 434
 435   g_return_if_fail (array);
 436
 437   if (length > array->len)
 438     {
 439       int i;
 440       g_ptr_array_maybe_expand (array, (length - array->len));
 441       /* This is not
 442        *     memset (array->pdata + array->len, 0,
 443        *            sizeof (gpointer) * (length - array->len));
 444        * to make it really portable. Remember (void*)NULL needn't be
 445        * bitwise zero. It of course is silly not to use memset (..,0,..).
 446        */
 447       for (i = array->len; i < length; i++)
 448         array->pdata[i] = NULL;
 449     }
 450 #ifdef ENABLE_GC_FRIENDLY
 451   else if (length < array->len)
 452     {
 453       int i;
 454       for (i = length; i < array->len; i++)
 455         array->pdata[i] = NULL;
 456     }
 457 #endif /* ENABLE_GC_FRIENDLY */
 458
 459   array->len = length;
 460 }
 461
 462 gpointer
 463 g_ptr_array_remove_index (GPtrArray* farray,
 464                           guint      index)
 465 {
 466   GRealPtrArray* array = (GRealPtrArray*) farray;
 467   gpointer result;
 468
 469   g_return_val_if_fail (array, NULL);
 470
 471   g_return_val_if_fail (index < array->len, NULL);
 472
 473   result = array->pdata[index];
 474
 475   if (index != array->len - 1)
 476     g_memmove (array->pdata + index, array->pdata + index + 1,
 477                sizeof (gpointer) * (array->len - index - 1));
 478
 479   array->len -= 1;
 480
 481 #ifdef ENABLE_GC_FRIENDLY
 482   array->pdata[array->len] = NULL;
 483 #endif /* ENABLE_GC_FRIENDLY */
 484
 485   return result;
 486 }
 487
 488 gpointer
 489 g_ptr_array_remove_index_fast (GPtrArray* farray,
 490                                guint      index)
 491 {
 492   GRealPtrArray* array = (GRealPtrArray*) farray;
 493   gpointer result;
 494
 495   g_return_val_if_fail (array, NULL);
 496
 497   g_return_val_if_fail (index < array->len, NULL);
 498
 499   result = array->pdata[index];
 500
 501   if (index != array->len - 1)
 502     array->pdata[index] = array->pdata[array->len - 1];
 503
 504   array->len -= 1;
 505
 506 #ifdef ENABLE_GC_FRIENDLY
 507   array->pdata[array->len] = NULL;
 508 #endif /* ENABLE_GC_FRIENDLY */
 509
 510   return result;
 511 }
 512
 513 gboolean
 514 g_ptr_array_remove (GPtrArray* farray,
 515                     gpointer data)
 516 {
 517   GRealPtrArray* array = (GRealPtrArray*) farray;
 518   int i;
 519
 520   g_return_val_if_fail (array, FALSE);
 521
 522   for (i = 0; i < array->len; i += 1)
 523     {
 524       if (array->pdata[i] == data)
 525         {
 526           g_ptr_array_remove_index (farray, i);
 527           return TRUE;
 528         }
 529     }
 530
 531   return FALSE;
 532 }
 533
 534 gboolean
 535 g_ptr_array_remove_fast (GPtrArray* farray,
 536                          gpointer data)
 537 {
 538   GRealPtrArray* array = (GRealPtrArray*) farray;
 539   int i;
 540
 541   g_return_val_if_fail (array, FALSE);
 542
 543   for (i = 0; i < array->len; i += 1)
 544     {
 545       if (array->pdata[i] == data)
 546         {
 547           g_ptr_array_remove_index_fast (farray, i);
 548           return TRUE;
 549         }
 550     }
 551
 552   return FALSE;
 553 }
 554
 555 void
 556 g_ptr_array_add (GPtrArray* farray,
 557                  gpointer data)
 558 {
 559   GRealPtrArray* array = (GRealPtrArray*) farray;
 560
 561   g_return_if_fail (array);
 562
 563   g_ptr_array_maybe_expand (array, 1);
 564
 565   array->pdata[array->len++] = data;
 566 }
 567
 568 void
 569 g_ptr_array_sort (GPtrArray    *array,
 570                   GCompareFunc  compare_func)
 571 {
 572   g_return_if_fail (array != NULL);
 573   g_return_if_fail (array->pdata != NULL);
 574
 575   qsort (array->pdata,
 576          array->len,
 577          sizeof (gpointer),
 578          compare_func);
 579 }
 580
 581 void
 582 g_ptr_array_sort_with_data (GPtrArray        *array,
 583                             GCompareDataFunc  compare_func,
 584                             gpointer          user_data)
 585 {
 586   g_return_if_fail (array != NULL);
 587   g_return_if_fail (array->pdata != NULL);
 588
 589   g_qsort_with_data (array->pdata,
 590                      array->len,
 591                      sizeof (gpointer),
 592                      compare_func,
 593                      user_data);
 594 }
 595
 596 /* Byte arrays
 597  */
 598
 599 GByteArray* g_byte_array_new      (void)
 600 {
 601   return (GByteArray*) g_array_sized_new (FALSE, FALSE, 1, 0);
 602 }
 603
 604 GByteArray* g_byte_array_sized_new (guint reserved_size)
 605 {
 606   return (GByteArray*) g_array_sized_new (FALSE, FALSE, 1, reserved_size);
 607 }
 608
 609 guint8*     g_byte_array_free     (GByteArray *array,
 610                                    gboolean    free_segment)
 611 {
 612   return (guint8*) g_array_free ((GArray*) array, free_segment);
 613 }
 614
 615 GByteArray* g_byte_array_append   (GByteArray *array,
 616                                    const guint8 *data,
 617                                    guint       len)
 618 {
 619   g_array_append_vals ((GArray*) array, (guint8*)data, len);
 620
 621   return array;
 622 }
 623
 624 GByteArray* g_byte_array_prepend  (GByteArray *array,
 625                                    const guint8 *data,
 626                                    guint       len)
 627 {
 628   g_array_prepend_vals ((GArray*) array, (guint8*)data, len);
 629
 630   return array;
 631 }
 632
 633 GByteArray* g_byte_array_set_size (GByteArray *array,
 634                                    guint       length)
 635 {
 636   g_array_set_size ((GArray*) array, length);
 637
 638   return array;
 639 }
 640
 641 GByteArray* g_byte_array_remove_index (GByteArray *array,
 642                                        guint index)
 643 {
 644   g_array_remove_index((GArray*) array, index);
 645
 646   return array;
 647 }
 648
 649 GByteArray* g_byte_array_remove_index_fast (GByteArray *array,
 650                                             guint index)
 651 {
 652   g_array_remove_index_fast((GArray*) array, index);
 653
 654   return array;
 655 }
 656
 657 void
 658 g_byte_array_sort (GByteArray   *array,
 659                    GCompareFunc  compare_func)
 660 {
 661   g_array_sort ((GArray *) array, compare_func);
 662 }
 663
 664 void
 665 g_byte_array_sort_with_data (GByteArray       *array,
 666                              GCompareDataFunc  compare_func,
 667                              gpointer          user_data)
 668 {
 669   g_array_sort_with_data ((GArray *) array, compare_func, user_data);
 670 }