gstring.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 #ifdef HAVE_UNISTD_H
  36 #include <unistd.h>
  37 #endif
  38 #include <stdarg.h>
  39 #include <stdlib.h>
  40 #include <stdio.h>
  41 #include <string.h>
  42 #include <ctype.h>
  43 #include "glib.h"
  44
  45 typedef struct _GRealStringChunk GRealStringChunk;
  46 typedef struct _GRealString      GRealString;
  47
  48 struct _GRealStringChunk
  49 {
  50   GHashTable *const_table;
  51   GSList     *storage_list;
  52   gint        storage_next;
  53   gint        this_size;
  54   gint        default_size;
  55 };
  56
  57 struct _GRealString
  58 {
  59   gchar *str;
  60   gint   len;
  61   gint   alloc;
  62 };
  63
  64 G_LOCK_DEFINE_STATIC (string_mem_chunk);
  65 static GMemChunk *string_mem_chunk = NULL;
  66
  67 /* Hash Functions.
  68  */
  69
  70 gboolean
  71 g_str_equal (gconstpointer v1,
  72              gconstpointer v2)
  73 {
  74   const gchar *string1 = v1;
  75   const gchar *string2 = v2;
  76
  77   return strcmp (string1, string2) == 0;
  78 }
  79
  80 /* 31 bit hash function */
  81 guint
  82 g_str_hash (gconstpointer key)
  83 {
  84   const char *p = key;
  85   guint h = *p;
  86
  87   if (h)
  88     for (p += 1; *p != '\0'; p++)
  89       h = (h << 5) - h + *p;
  90
  91   return h;
  92 }
  93
  94
  95 /* String Chunks.
  96  */
  97
  98 GStringChunk*
  99 g_string_chunk_new (gint default_size)
 100 {
 101   GRealStringChunk *new_chunk = g_new (GRealStringChunk, 1);
 102   gint size = 1;
 103
 104   while (size < default_size)
 105     size <<= 1;
 106
 107   new_chunk->const_table       = NULL;
 108   new_chunk->storage_list      = NULL;
 109   new_chunk->storage_next      = size;
 110   new_chunk->default_size      = size;
 111   new_chunk->this_size         = size;
 112
 113   return (GStringChunk*) new_chunk;
 114 }
 115
 116 void
 117 g_string_chunk_free (GStringChunk *fchunk)
 118 {
 119   GRealStringChunk *chunk = (GRealStringChunk*) fchunk;
 120   GSList *tmp_list;
 121
 122   g_return_if_fail (chunk != NULL);
 123
 124   if (chunk->storage_list)
 125     {
 126       for (tmp_list = chunk->storage_list; tmp_list; tmp_list = tmp_list->next)
 127         g_free (tmp_list->data);
 128
 129       g_slist_free (chunk->storage_list);
 130     }
 131
 132   if (chunk->const_table)
 133     g_hash_table_destroy (chunk->const_table);
 134
 135   g_free (chunk);
 136 }
 137
 138 gchar*
 139 g_string_chunk_insert (GStringChunk *fchunk,
 140                        const gchar  *string)
 141 {
 142   GRealStringChunk *chunk = (GRealStringChunk*) fchunk;
 143   gint len = strlen (string);
 144   char* pos;
 145
 146   g_return_val_if_fail (chunk != NULL, NULL);
 147
 148   if ((chunk->storage_next + len + 1) > chunk->this_size)
 149     {
 150       gint new_size = chunk->default_size;
 151
 152       while (new_size < len+1)
 153         new_size <<= 1;
 154
 155       chunk->storage_list = g_slist_prepend (chunk->storage_list,
 156                                              g_new (char, new_size));
 157
 158       chunk->this_size = new_size;
 159       chunk->storage_next = 0;
 160     }
 161
 162   pos = ((char *) chunk->storage_list->data) + chunk->storage_next;
 163
 164   strcpy (pos, string);
 165
 166   chunk->storage_next += len + 1;
 167
 168   return pos;
 169 }
 170
 171 gchar*
 172 g_string_chunk_insert_const (GStringChunk *fchunk,
 173                              const gchar  *string)
 174 {
 175   GRealStringChunk *chunk = (GRealStringChunk*) fchunk;
 176   char* lookup;
 177
 178   g_return_val_if_fail (chunk != NULL, NULL);
 179
 180   if (!chunk->const_table)
 181     chunk->const_table = g_hash_table_new (g_str_hash, g_str_equal);
 182
 183   lookup = (char*) g_hash_table_lookup (chunk->const_table, (gchar *)string);
 184
 185   if (!lookup)
 186     {
 187       lookup = g_string_chunk_insert (fchunk, string);
 188       g_hash_table_insert (chunk->const_table, lookup, lookup);
 189     }
 190
 191   return lookup;
 192 }
 193
 194 /* Strings.
 195  */
 196 static inline gint
 197 nearest_power (gint num)
 198 {
 199   gint n = 1;
 200
 201   while (n < num)
 202     n <<= 1;
 203
 204   return n;
 205 }
 206
 207 static void
 208 g_string_maybe_expand (GRealString* string, gint len)
 209 {
 210   if (string->len + len >= string->alloc)
 211     {
 212       string->alloc = nearest_power (string->len + len + 1);
 213       string->str = g_realloc (string->str, string->alloc);
 214     }
 215 }
 216
 217 GString*
 218 g_string_sized_new (guint dfl_size)
 219 {
 220   GRealString *string;
 221
 222   G_LOCK (string_mem_chunk);
 223   if (!string_mem_chunk)
 224     string_mem_chunk = g_mem_chunk_new ("string mem chunk",
 225                                         sizeof (GRealString),
 226                                         1024, G_ALLOC_AND_FREE);
 227
 228   string = g_chunk_new (GRealString, string_mem_chunk);
 229   G_UNLOCK (string_mem_chunk);
 230
 231   string->alloc = 0;
 232   string->len   = 0;
 233   string->str   = NULL;
 234
 235   g_string_maybe_expand (string, MAX (dfl_size, 2));
 236   string->str[0] = 0;
 237
 238   return (GString*) string;
 239 }
 240
 241 GString*
 242 g_string_new (const gchar *init)
 243 {
 244   GString *string;
 245
 246   string = g_string_sized_new (init ? strlen (init) + 2 : 2);
 247
 248   if (init)
 249     g_string_append (string, init);
 250
 251   return string;
 252 }
 253
 254 GString*
 255 g_string_new_len (const gchar *init,
 256                   gint         len)
 257 {
 258   GString *string;
 259
 260   if (len < 0)
 261     return g_string_new (init);
 262   else
 263     {
 264       string = g_string_sized_new (len);
 265
 266       if (init)
 267         g_string_append_len (string, init, len);
 268
 269       return string;
 270     }
 271 }
 272
 273 gchar*
 274 g_string_free (GString *string,
 275                gboolean free_segment)
 276 {
 277   gchar *segment;
 278
 279   g_return_val_if_fail (string != NULL, NULL);
 280
 281   if (free_segment)
 282     {
 283       g_free (string->str);
 284       segment = NULL;
 285     }
 286   else
 287     segment = string->str;
 288
 289   G_LOCK (string_mem_chunk);
 290   g_mem_chunk_free (string_mem_chunk, string);
 291   G_UNLOCK (string_mem_chunk);
 292
 293   return segment;
 294 }
 295
 296 gboolean
 297 g_string_equal (const GString *v,
 298                 const GString *v2)
 299 {
 300   gchar *p, *q;
 301   GRealString *string1 = (GRealString *) v;
 302   GRealString *string2 = (GRealString *) v2;
 303   gint i = string1->len;
 304
 305   if (i != string2->len)
 306     return FALSE;
 307
 308   p = string1->str;
 309   q = string2->str;
 310   while (i)
 311     {
 312       if (*p != *q)
 313         return FALSE;
 314       p++;
 315       q++;
 316       i--;
 317     }
 318   return TRUE;
 319 }
 320
 321 /* 31 bit hash function */
 322 guint
 323 g_string_hash (const GString *str)
 324 {
 325   const gchar *p = str->str;
 326   gint n = str->len;
 327   guint h = 0;
 328
 329   while (n--)
 330     {
 331       h = (h << 5) - h + *p;
 332       p++;
 333     }
 334
 335   return h;
 336 }
 337
 338 GString*
 339 g_string_assign (GString     *string,
 340                  const gchar *rval)
 341 {
 342   g_return_val_if_fail (string != NULL, NULL);
 343   g_return_val_if_fail (rval != NULL, string);
 344
 345   g_string_truncate (string, 0);
 346   g_string_append (string, rval);
 347
 348   return string;
 349 }
 350
 351 GString*
 352 g_string_truncate (GString *fstring,
 353                    guint    len)
 354 {
 355   GRealString *string = (GRealString *) fstring;
 356
 357   g_return_val_if_fail (string != NULL, NULL);
 358
 359   string->len = MIN (len, string->len);
 360
 361   string->str[string->len] = 0;
 362
 363   return fstring;
 364 }
 365
 366 GString*
 367 g_string_insert_len (GString     *fstring,
 368                      gint         pos,
 369                      const gchar *val,
 370                      gint         len)
 371 {
 372   GRealString *string = (GRealString *) fstring;
 373
 374   g_return_val_if_fail (string != NULL, NULL);
 375   g_return_val_if_fail (val != NULL, fstring);
 376   g_return_val_if_fail (pos <= string->len, fstring);
 377
 378   if (len < 0)
 379     len = strlen (val);
 380
 381   if (pos < 0)
 382     pos = string->len;
 383
 384   g_string_maybe_expand (string, len);
 385
 386   /* If we aren't appending at the end, move a hunk
 387    * of the old string to the end, opening up space
 388    */
 389   if (pos < string->len)
 390     g_memmove (string->str + pos + len, string->str + pos, string->len - pos);
 391
 392   /* insert the new string */
 393   g_memmove (string->str + pos, val, len);
 394
 395   string->len += len;
 396
 397   string->str[string->len] = 0;
 398
 399   return fstring;
 400 }
 401
 402 GString*
 403 g_string_append (GString     *fstring,
 404                  const gchar *val)
 405 {
 406   g_return_val_if_fail (fstring != NULL, NULL);
 407   g_return_val_if_fail (val != NULL, fstring);
 408
 409   return g_string_insert_len (fstring, -1, val, -1);
 410 }
 411
 412 GString*
 413 g_string_append_len (GString     *string,
 414                      const gchar *val,
 415                      gint         len)
 416 {
 417   g_return_val_if_fail (string != NULL, NULL);
 418   g_return_val_if_fail (val != NULL, string);
 419
 420   return g_string_insert_len (string, -1, val, len);
 421 }
 422
 423 GString*
 424 g_string_append_c (GString *fstring,
 425                    gchar    c)
 426 {
 427   g_return_val_if_fail (fstring != NULL, NULL);
 428
 429   return g_string_insert_c (fstring, -1, c);
 430 }
 431
 432 GString*
 433 g_string_prepend (GString     *fstring,
 434                   const gchar *val)
 435 {
 436   g_return_val_if_fail (fstring != NULL, NULL);
 437   g_return_val_if_fail (val != NULL, fstring);
 438
 439   return g_string_insert_len (fstring, 0, val, -1);
 440 }
 441
 442 GString*
 443 g_string_prepend_len (GString     *string,
 444                       const gchar *val,
 445                       gint         len)
 446 {
 447   g_return_val_if_fail (string != NULL, NULL);
 448   g_return_val_if_fail (val != NULL, string);
 449
 450   return g_string_insert_len (string, 0, val, len);
 451 }
 452
 453 GString*
 454 g_string_prepend_c (GString *fstring,
 455                     gchar    c)
 456 {
 457   g_return_val_if_fail (fstring != NULL, NULL);
 458
 459   return g_string_insert_c (fstring, 0, c);
 460 }
 461
 462 GString*
 463 g_string_insert (GString     *fstring,
 464                  gint         pos,
 465                  const gchar *val)
 466 {
 467   g_return_val_if_fail (fstring != NULL, NULL);
 468   g_return_val_if_fail (val != NULL, fstring);
 469   g_return_val_if_fail (pos <= fstring->len, fstring);
 470
 471   return g_string_insert_len (fstring, pos, val, -1);
 472 }
 473
 474 GString*
 475 g_string_insert_c (GString *fstring,
 476                    gint     pos,
 477                    gchar    c)
 478 {
 479   GRealString *string = (GRealString *) fstring;
 480
 481   g_return_val_if_fail (string != NULL, NULL);
 482   g_return_val_if_fail (pos <= string->len, fstring);
 483
 484   g_string_maybe_expand (string, 1);
 485
 486   if (pos < 0)
 487     pos = string->len;
 488
 489   /* If not just an append, move the old stuff */
 490   if (pos < string->len)
 491     g_memmove (string->str + pos + 1, string->str + pos, string->len - pos);
 492
 493   string->str[pos] = c;
 494
 495   string->len += 1;
 496
 497   string->str[string->len] = 0;
 498
 499   return fstring;
 500 }
 501
 502 GString*
 503 g_string_erase (GString *fstring,
 504                 gint     pos,
 505                 gint     len)
 506 {
 507   GRealString *string = (GRealString*)fstring;
 508
 509   g_return_val_if_fail (string != NULL, NULL);
 510   g_return_val_if_fail (len >= 0, fstring);
 511   g_return_val_if_fail (pos >= 0, fstring);
 512   g_return_val_if_fail (pos <= string->len, fstring);
 513   g_return_val_if_fail (pos + len <= string->len, fstring);
 514
 515   if (pos + len < string->len)
 516     g_memmove (string->str + pos, string->str + pos + len, string->len - (pos + len));
 517
 518   string->len -= len;
 519
 520   string->str[string->len] = 0;
 521
 522   return fstring;
 523 }
 524
 525 GString*
 526 g_string_down (GString *fstring)
 527 {
 528   GRealString *string = (GRealString *) fstring;
 529   guchar *s;
 530   gint n = string->len;
 531
 532   g_return_val_if_fail (string != NULL, NULL);
 533
 534   s = (guchar *) string->str;
 535
 536   while (n)
 537     {
 538       *s = tolower (*s);
 539       s++;
 540       n--;
 541     }
 542
 543   return fstring;
 544 }
 545
 546 GString*
 547 g_string_up (GString *fstring)
 548 {
 549   GRealString *string = (GRealString *) fstring;
 550   guchar *s;
 551   gint n = string->len;
 552
 553   g_return_val_if_fail (string != NULL, NULL);
 554
 555   s = (guchar *) string->str;
 556
 557   while (n)
 558     {
 559       *s = toupper (*s);
 560       s++;
 561       n--;
 562     }
 563
 564   return fstring;
 565 }
 566
 567 static void
 568 g_string_printfa_internal (GString     *string,
 569                            const gchar *fmt,
 570                            va_list      args)
 571 {
 572   gchar *buffer;
 573
 574   buffer = g_strdup_vprintf (fmt, args);
 575   g_string_append (string, buffer);
 576   g_free (buffer);
 577 }
 578
 579 void
 580 g_string_printf (GString *string,
 581                  const gchar *fmt,
 582                  ...)
 583 {
 584   va_list args;
 585
 586   g_string_truncate (string, 0);
 587
 588   va_start (args, fmt);
 589   g_string_printfa_internal (string, fmt, args);
 590   va_end (args);
 591 }
 592
 593 void
 594 g_string_printfa (GString *string,
 595                   const gchar *fmt,
 596                   ...)
 597 {
 598   va_list args;
 599
 600   va_start (args, fmt);
 601   g_string_printfa_internal (string, fmt, args);
 602   va_end (args);
 603 }