glib/gscanner.c

   1 /* GLIB - Library of useful routines for C programming
   2  * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald
   3  *
   4  * GScanner: Flexible lexical scanner for general purpose.
   5  * Copyright (C) 1997, 1998 Tim Janik
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Library General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Library General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Library General Public
  18  * License along with this library; if not, write to the
  19  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20  * Boston, MA 02111-1307, USA.
  21  */
  22 #define         __gscanner_c__
  23
  24 #include        <stdlib.h>
  25 #include        <stdarg.h>
  26 #include        <string.h>
  27 #include        <stdio.h>
  28 #include        "glib.h"
  29 #ifdef HAVE_UNISTD_H
  30 #include        <unistd.h>
  31 #endif
  32 #include        <errno.h>
  33 #include        <sys/types.h>   /* needed for sys/stat.h */
  34 #include        <sys/stat.h>
  35 #ifdef _MSC_VER
  36 #include        <io.h>          /* For _read() */
  37 #endif
  38
  39 /* --- defines --- */
  40 #define to_lower(c)                             ( \
  41         (guchar) (                                                      \
  42           ( (((guchar)(c))>='A' && ((guchar)(c))<='Z') * ('a'-'A') ) |  \
  43           ( (((guchar)(c))>=192 && ((guchar)(c))<=214) * (224-192) ) |  \
  44           ( (((guchar)(c))>=216 && ((guchar)(c))<=222) * (248-216) ) |  \
  45           ((guchar)(c))                                                 \
  46         )                                                               \
  47 )
  48 #define READ_BUFFER_SIZE        (4000)
  49
  50
  51 /* --- typedefs --- */
  52 typedef struct  _GScannerKey    GScannerKey;
  53
  54 struct  _GScannerKey
  55 {
  56   guint          scope_id;
  57   gchar         *symbol;
  58   gpointer       value;
  59 };
  60
  61
  62
  63 /* --- variables --- */
  64 static GScannerConfig g_scanner_config_template =
  65 {
  66   (
  67    " \t\r\n"
  68    )                    /* cset_skip_characters */,
  69   (
  70    G_CSET_a_2_z
  71    "_"
  72    G_CSET_A_2_Z
  73    )                    /* cset_identifier_first */,
  74   (
  75    G_CSET_a_2_z
  76    "_0123456789"
  77    G_CSET_A_2_Z
  78    G_CSET_LATINS
  79    G_CSET_LATINC
  80    )                    /* cset_identifier_nth */,
  81   ( "#\n" )             /* cpair_comment_single */,
  82
  83   FALSE                 /* case_sensitive */,
  84
  85   TRUE                  /* skip_comment_multi */,
  86   TRUE                  /* skip_comment_single */,
  87   TRUE                  /* scan_comment_multi */,
  88   TRUE                  /* scan_identifier */,
  89   FALSE                 /* scan_identifier_1char */,
  90   FALSE                 /* scan_identifier_NULL */,
  91   TRUE                  /* scan_symbols */,
  92   FALSE                 /* scan_binary */,
  93   TRUE                  /* scan_octal */,
  94   TRUE                  /* scan_float */,
  95   TRUE                  /* scan_hex */,
  96   FALSE                 /* scan_hex_dollar */,
  97   TRUE                  /* scan_string_sq */,
  98   TRUE                  /* scan_string_dq */,
  99   TRUE                  /* numbers_2_int */,
 100   FALSE                 /* int_2_float */,
 101   FALSE                 /* identifier_2_string */,
 102   TRUE                  /* char_2_token */,
 103   FALSE                 /* symbol_2_token */,
 104   FALSE                 /* scope_0_fallback */,
 105 };
 106
 107
 108 /* --- prototypes --- */
 109 static inline
 110 GScannerKey*    g_scanner_lookup_internal (GScanner     *scanner,
 111                                            guint         scope_id,
 112                                            const gchar  *symbol);
 113 static gint     g_scanner_key_equal       (gconstpointer v1,
 114                                            gconstpointer v2);
 115 static guint    g_scanner_key_hash        (gconstpointer v);
 116 static void     g_scanner_get_token_ll    (GScanner     *scanner,
 117                                            GTokenType   *token_p,
 118                                            GTokenValue  *value_p,
 119                                            guint        *line_p,
 120                                            guint        *position_p);
 121 static void     g_scanner_get_token_i     (GScanner     *scanner,
 122                                            GTokenType   *token_p,
 123                                            GTokenValue  *value_p,
 124                                            guint        *line_p,
 125                                            guint        *position_p);
 126
 127 static guchar   g_scanner_peek_next_char  (GScanner     *scanner);
 128 static guchar   g_scanner_get_char        (GScanner     *scanner,
 129                                            guint        *line_p,
 130                                            guint        *position_p);
 131 static void     g_scanner_msg_handler     (GScanner     *scanner,
 132                                            gchar        *message,
 133                                            gint          is_error);
 134
 135
 136 /* --- functions --- */
 137 static inline gint
 138 g_scanner_char_2_num (guchar    c,
 139                       guchar    base)
 140 {
 141   if (c >= '0' && c <= '9')
 142     c -= '0';
 143   else if (c >= 'A' && c <= 'Z')
 144     c -= 'A' - 10;
 145   else if (c >= 'a' && c <= 'z')
 146     c -= 'a' - 10;
 147   else
 148     return -1;
 149
 150   if (c < base)
 151     return c;
 152
 153   return -1;
 154 }
 155
 156 GScanner*
 157 g_scanner_new (GScannerConfig   *config_templ)
 158 {
 159   register GScanner     *scanner;
 160
 161   if (!config_templ)
 162     config_templ = &g_scanner_config_template;
 163
 164   scanner = g_new0 (GScanner, 1);
 165
 166   scanner->user_data = NULL;
 167   scanner->max_parse_errors = 0;
 168   scanner->parse_errors = 0;
 169   scanner->input_name = NULL;
 170   scanner->derived_data = NULL;
 171
 172   scanner->config = g_new0 (GScannerConfig, 1);
 173
 174   scanner->config->case_sensitive       = config_templ->case_sensitive;
 175   scanner->config->cset_skip_characters = config_templ->cset_skip_characters;
 176   scanner->config->cset_identifier_first= config_templ->cset_identifier_first;
 177   scanner->config->cset_identifier_nth  = config_templ->cset_identifier_nth;
 178   scanner->config->cpair_comment_single = config_templ->cpair_comment_single;
 179   scanner->config->skip_comment_multi   = config_templ->skip_comment_multi;
 180   scanner->config->skip_comment_single  = config_templ->skip_comment_single;
 181   scanner->config->scan_comment_multi   = config_templ->scan_comment_multi;
 182   scanner->config->scan_identifier      = config_templ->scan_identifier;
 183   scanner->config->scan_identifier_1char= config_templ->scan_identifier_1char;
 184   scanner->config->scan_identifier_NULL = config_templ->scan_identifier_NULL;
 185   scanner->config->scan_symbols         = config_templ->scan_symbols;
 186   scanner->config->scan_binary          = config_templ->scan_binary;
 187   scanner->config->scan_octal           = config_templ->scan_octal;
 188   scanner->config->scan_float           = config_templ->scan_float;
 189   scanner->config->scan_hex             = config_templ->scan_hex;
 190   scanner->config->scan_hex_dollar      = config_templ->scan_hex_dollar;
 191   scanner->config->scan_string_sq       = config_templ->scan_string_sq;
 192   scanner->config->scan_string_dq       = config_templ->scan_string_dq;
 193   scanner->config->numbers_2_int        = config_templ->numbers_2_int;
 194   scanner->config->int_2_float          = config_templ->int_2_float;
 195   scanner->config->identifier_2_string  = config_templ->identifier_2_string;
 196   scanner->config->char_2_token         = config_templ->char_2_token;
 197   scanner->config->symbol_2_token       = config_templ->symbol_2_token;
 198   scanner->config->scope_0_fallback     = config_templ->scope_0_fallback;
 199
 200   scanner->token = G_TOKEN_NONE;
 201   scanner->value.v_int = 0;
 202   scanner->line = 1;
 203   scanner->position = 0;
 204
 205   scanner->next_token = G_TOKEN_NONE;
 206   scanner->next_value.v_int = 0;
 207   scanner->next_line = 1;
 208   scanner->next_position = 0;
 209
 210   scanner->symbol_table = g_hash_table_new (g_scanner_key_hash, g_scanner_key_equal);
 211   scanner->input_fd = -1;
 212   scanner->text = NULL;
 213   scanner->text_end = NULL;
 214   scanner->buffer = NULL;
 215   scanner->scope_id = 0;
 216
 217   scanner->msg_handler = g_scanner_msg_handler;
 218
 219   return scanner;
 220 }
 221
 222 static inline void
 223 g_scanner_free_value (GTokenType     *token_p,
 224                       GTokenValue     *value_p)
 225 {
 226   switch (*token_p)
 227     {
 228     case  G_TOKEN_STRING:
 229     case  G_TOKEN_IDENTIFIER:
 230     case  G_TOKEN_IDENTIFIER_NULL:
 231     case  G_TOKEN_COMMENT_SINGLE:
 232     case  G_TOKEN_COMMENT_MULTI:
 233       g_free (value_p->v_string);
 234       break;
 235
 236     default:
 237       break;
 238     }
 239
 240   *token_p = G_TOKEN_NONE;
 241 }
 242
 243 static void
 244 g_scanner_destroy_symbol_table_entry (gpointer _key,
 245                                       gpointer _value,
 246                                       gpointer _data)
 247 {
 248   GScannerKey *key = _key;
 249
 250   g_free (key->symbol);
 251   g_free (key);
 252 }
 253
 254 void
 255 g_scanner_destroy (GScanner     *scanner)
 256 {
 257   g_return_if_fail (scanner != NULL);
 258
 259   g_hash_table_foreach (scanner->symbol_table,
 260                         g_scanner_destroy_symbol_table_entry, NULL);
 261   g_hash_table_destroy (scanner->symbol_table);
 262   g_scanner_free_value (&scanner->token, &scanner->value);
 263   g_scanner_free_value (&scanner->next_token, &scanner->next_value);
 264   g_free (scanner->config);
 265   g_free (scanner->buffer);
 266   g_free (scanner);
 267 }
 268
 269 static void
 270 g_scanner_msg_handler (GScanner         *scanner,
 271                        gchar            *message,
 272                        gint              is_error)
 273 {
 274   g_return_if_fail (scanner != NULL);
 275
 276   fprintf (stdout, "%s:%d: ", scanner->input_name, scanner->line);
 277   if (is_error)
 278     fprintf (stdout, "error: ");
 279   fprintf (stdout, "%s\n", message);
 280 }
 281
 282 void
 283 g_scanner_error (GScanner       *scanner,
 284                  const gchar    *format,
 285                  ...)
 286 {
 287   g_return_if_fail (scanner != NULL);
 288   g_return_if_fail (format != NULL);
 289
 290   scanner->parse_errors++;
 291
 292   if (scanner->msg_handler)
 293     {
 294       va_list args;
 295       gchar *string;
 296
 297       va_start (args, format);
 298       string = g_strdup_vprintf (format, args);
 299       va_end (args);
 300
 301       scanner->msg_handler (scanner, string, TRUE);
 302
 303       g_free (string);
 304     }
 305 }
 306
 307 void
 308 g_scanner_warn (GScanner       *scanner,
 309                 const gchar    *format,
 310                 ...)
 311 {
 312   g_return_if_fail (scanner != NULL);
 313   g_return_if_fail (format != NULL);
 314
 315   if (scanner->msg_handler)
 316     {
 317       va_list args;
 318       gchar *string;
 319
 320       va_start (args, format);
 321       string = g_strdup_vprintf (format, args);
 322       va_end (args);
 323
 324       scanner->msg_handler (scanner, string, FALSE);
 325
 326       g_free (string);
 327     }
 328 }
 329
 330 static gint
 331 g_scanner_key_equal (gconstpointer v1,
 332                      gconstpointer v2)
 333 {
 334   register const GScannerKey *key1 = v1;
 335   register const GScannerKey *key2 = v2;
 336
 337   return (key1->scope_id == key2->scope_id) && (strcmp (key1->symbol, key2->symbol) == 0);
 338 }
 339
 340 static guint
 341 g_scanner_key_hash (gconstpointer v)
 342 {
 343   register const GScannerKey *key = v;
 344   register gchar *c;
 345   register guint h;
 346
 347   h = key->scope_id;
 348   for (c = key->symbol; *c; c++)
 349     {
 350       register guint g;
 351
 352       h = (h << 4) + *c;
 353       g = h & 0xf0000000;
 354       if (g)
 355         {
 356           h = h ^ (g >> 24);
 357           h = h ^ g;
 358         }
 359     }
 360
 361   return h;
 362 }
 363
 364 static inline GScannerKey*
 365 g_scanner_lookup_internal (GScanner     *scanner,
 366                            guint         scope_id,
 367                            const gchar  *symbol)
 368 {
 369   register GScannerKey  *key_p;
 370   GScannerKey key;
 371
 372   key.scope_id = scope_id;
 373
 374   if (!scanner->config->case_sensitive)
 375     {
 376       register gchar *d;
 377       register const gchar *c;
 378
 379       key.symbol = g_new (gchar, strlen (symbol) + 1);
 380       for (d = key.symbol, c = symbol; *c; c++, d++)
 381         *d = to_lower (*c);
 382       *d = 0;
 383       key_p = g_hash_table_lookup (scanner->symbol_table, &key);
 384       g_free (key.symbol);
 385     }
 386   else
 387     {
 388       key.symbol = (gchar*) symbol;
 389       key_p = g_hash_table_lookup (scanner->symbol_table, &key);
 390     }
 391
 392   return key_p;
 393 }
 394
 395 void
 396 g_scanner_scope_add_symbol (GScanner    *scanner,
 397                             guint        scope_id,
 398                             const gchar *symbol,
 399                             gpointer     value)
 400 {
 401   register GScannerKey  *key;
 402
 403   g_return_if_fail (scanner != NULL);
 404   g_return_if_fail (symbol != NULL);
 405
 406   key = g_scanner_lookup_internal (scanner, scope_id, symbol);
 407
 408   if (!key)
 409     {
 410       key = g_new (GScannerKey, 1);
 411       key->scope_id = scope_id;
 412       key->symbol = g_strdup (symbol);
 413       key->value = value;
 414       if (!scanner->config->case_sensitive)
 415         {
 416           register gchar *c;
 417
 418           c = key->symbol;
 419           while (*c != 0)
 420             {
 421               *c = to_lower (*c);
 422               c++;
 423             }
 424         }
 425       g_hash_table_insert (scanner->symbol_table, key, key);
 426     }
 427   else
 428     key->value = value;
 429 }
 430
 431 void
 432 g_scanner_scope_remove_symbol (GScanner    *scanner,
 433                                guint        scope_id,
 434                                const gchar *symbol)
 435 {
 436   register GScannerKey  *key;
 437
 438   g_return_if_fail (scanner != NULL);
 439   g_return_if_fail (symbol != NULL);
 440
 441   key = g_scanner_lookup_internal (scanner, scope_id, symbol);
 442
 443   if (key)
 444     {
 445       g_hash_table_remove (scanner->symbol_table, key);
 446       g_free (key->symbol);
 447       g_free (key);
 448     }
 449 }
 450
 451 gpointer
 452 g_scanner_lookup_symbol (GScanner       *scanner,
 453                          const gchar    *symbol)
 454 {
 455   register GScannerKey  *key;
 456   register guint scope_id;
 457
 458   g_return_val_if_fail (scanner != NULL, NULL);
 459
 460   if (!symbol)
 461     return NULL;
 462
 463   scope_id = scanner->scope_id;
 464   key = g_scanner_lookup_internal (scanner, scope_id, symbol);
 465   if (!key && scope_id && scanner->config->scope_0_fallback)
 466     key = g_scanner_lookup_internal (scanner, 0, symbol);
 467
 468   if (key)
 469     return key->value;
 470   else
 471     return NULL;
 472 }
 473
 474 gpointer
 475 g_scanner_scope_lookup_symbol (GScanner       *scanner,
 476                                guint           scope_id,
 477                                const gchar    *symbol)
 478 {
 479   register GScannerKey  *key;
 480
 481   g_return_val_if_fail (scanner != NULL, NULL);
 482
 483   if (!symbol)
 484     return NULL;
 485
 486   key = g_scanner_lookup_internal (scanner, scope_id, symbol);
 487
 488   if (key)
 489     return key->value;
 490   else
 491     return NULL;
 492 }
 493
 494 guint
 495 g_scanner_set_scope (GScanner       *scanner,
 496                      guint           scope_id)
 497 {
 498   register guint old_scope_id;
 499
 500   g_return_val_if_fail (scanner != NULL, 0);
 501
 502   old_scope_id = scanner->scope_id;
 503   scanner->scope_id = scope_id;
 504
 505   return old_scope_id;
 506 }
 507
 508 static void
 509 g_scanner_foreach_internal (gpointer  _key,
 510                             gpointer  _value,
 511                             gpointer  _user_data)
 512 {
 513   register GScannerKey *key;
 514   register gpointer *d;
 515   register GHFunc func;
 516   register gpointer func_data;
 517   register guint *scope_id;
 518
 519   d = _user_data;
 520   func = (GHFunc) d[0];
 521   func_data = d[1];
 522   scope_id = d[2];
 523   key = _value;
 524
 525   if (key->scope_id == *scope_id)
 526     func (key->symbol, key->value, func_data);
 527 }
 528
 529 void
 530 g_scanner_scope_foreach_symbol (GScanner       *scanner,
 531                                 guint           scope_id,
 532                                 GHFunc          func,
 533                                 gpointer        func_data)
 534 {
 535   gpointer d[3];
 536
 537   g_return_if_fail (scanner != NULL);
 538
 539   d[0] = (gpointer) func;
 540   d[1] = func_data;
 541   d[2] = &scope_id;
 542
 543   g_hash_table_foreach (scanner->symbol_table, g_scanner_foreach_internal, d);
 544 }
 545
 546 void
 547 g_scanner_freeze_symbol_table (GScanner *scanner)
 548 {
 549   g_return_if_fail (scanner != NULL);
 550
 551   g_hash_table_freeze (scanner->symbol_table);
 552 }
 553
 554 void
 555 g_scanner_thaw_symbol_table (GScanner *scanner)
 556 {
 557   g_return_if_fail (scanner != NULL);
 558
 559   g_hash_table_thaw (scanner->symbol_table);
 560 }
 561
 562 GTokenType
 563 g_scanner_peek_next_token (GScanner     *scanner)
 564 {
 565   g_return_val_if_fail (scanner != NULL, G_TOKEN_EOF);
 566
 567   if (scanner->next_token == G_TOKEN_NONE)
 568     {
 569       scanner->next_line = scanner->line;
 570       scanner->next_position = scanner->position;
 571       g_scanner_get_token_i (scanner,
 572                              &scanner->next_token,
 573                              &scanner->next_value,
 574                              &scanner->next_line,
 575                              &scanner->next_position);
 576     }
 577
 578   return scanner->next_token;
 579 }
 580
 581 GTokenType
 582 g_scanner_get_next_token (GScanner      *scanner)
 583 {
 584   g_return_val_if_fail (scanner != NULL, G_TOKEN_EOF);
 585
 586   if (scanner->next_token != G_TOKEN_NONE)
 587     {
 588       g_scanner_free_value (&scanner->token, &scanner->value);
 589
 590       scanner->token = scanner->next_token;
 591       scanner->value = scanner->next_value;
 592       scanner->line = scanner->next_line;
 593       scanner->position = scanner->next_position;
 594       scanner->next_token = G_TOKEN_NONE;
 595     }
 596   else
 597     g_scanner_get_token_i (scanner,
 598                            &scanner->token,
 599                            &scanner->value,
 600                            &scanner->line,
 601                            &scanner->position);
 602
 603   return scanner->token;
 604 }
 605
 606 GTokenType
 607 g_scanner_cur_token (GScanner *scanner)
 608 {
 609   g_return_val_if_fail (scanner != NULL, G_TOKEN_EOF);
 610
 611   return scanner->token;
 612 }
 613
 614 GTokenValue
 615 g_scanner_cur_value (GScanner *scanner)
 616 {
 617   GTokenValue v;
 618
 619   g_return_val_if_fail (scanner != NULL, v);
 620
 621   /* MSC isn't capable of handling return scanner->value; ? */
 622
 623   v.v_int = 0;
 624
 625   v = scanner->value;
 626
 627   return v;
 628 }
 629
 630 guint
 631 g_scanner_cur_line (GScanner *scanner)
 632 {
 633   g_return_val_if_fail (scanner != NULL, 0);
 634
 635   return scanner->line;
 636 }
 637
 638 guint
 639 g_scanner_cur_position (GScanner *scanner)
 640 {
 641   g_return_val_if_fail (scanner != NULL, 0);
 642
 643   return scanner->position;
 644 }
 645
 646 gboolean
 647 g_scanner_eof (GScanner *scanner)
 648 {
 649   g_return_val_if_fail (scanner != NULL, TRUE);
 650
 651   return scanner->token == G_TOKEN_EOF;
 652 }
 653
 654 void
 655 g_scanner_input_file (GScanner *scanner,
 656                       gint      input_fd)
 657 {
 658   g_return_if_fail (scanner != NULL);
 659   g_return_if_fail (input_fd >= 0);
 660
 661   if (scanner->input_fd >= 0)
 662     g_scanner_sync_file_offset (scanner);
 663
 664   scanner->token = G_TOKEN_NONE;
 665   scanner->value.v_int = 0;
 666   scanner->line = 1;
 667   scanner->position = 0;
 668   scanner->next_token = G_TOKEN_NONE;
 669
 670   scanner->input_fd = input_fd;
 671   scanner->text = NULL;
 672   scanner->text_end = NULL;
 673
 674   if (!scanner->buffer)
 675     scanner->buffer = g_new (gchar, READ_BUFFER_SIZE + 1);
 676 }
 677
 678 void
 679 g_scanner_input_text (GScanner    *scanner,
 680                       const gchar *text,
 681                       guint        text_len)
 682 {
 683   g_return_if_fail (scanner != NULL);
 684   if (text_len)
 685     g_return_if_fail (text != NULL);
 686   else
 687     text = NULL;
 688
 689   if (scanner->input_fd >= 0)
 690     g_scanner_sync_file_offset (scanner);
 691
 692   scanner->token = G_TOKEN_NONE;
 693   scanner->value.v_int = 0;
 694   scanner->line = 1;
 695   scanner->position = 0;
 696   scanner->next_token = G_TOKEN_NONE;
 697
 698   scanner->input_fd = -1;
 699   scanner->text = text;
 700   scanner->text_end = text + text_len;
 701
 702   if (scanner->buffer)
 703     {
 704       g_free (scanner->buffer);
 705       scanner->buffer = NULL;
 706     }
 707 }
 708
 709 static guchar
 710 g_scanner_peek_next_char (GScanner *scanner)
 711 {
 712   if (scanner->text < scanner->text_end)
 713     {
 714       return *scanner->text;
 715     }
 716   else if (scanner->input_fd >= 0)
 717     {
 718       register gint count;
 719       register gchar *buffer;
 720
 721       buffer = scanner->buffer;
 722       do
 723         {
 724           count = read (scanner->input_fd, buffer, READ_BUFFER_SIZE);
 725         }
 726       while (count == -1 && (errno == EINTR || errno == EAGAIN));
 727
 728       if (count < 1)
 729         {
 730           scanner->input_fd = -1;
 731
 732           return 0;
 733         }
 734       else
 735         {
 736           scanner->text = buffer;
 737           scanner->text_end = buffer + count;
 738
 739           return *buffer;
 740         }
 741     }
 742   else
 743     return 0;
 744 }
 745
 746 void
 747 g_scanner_sync_file_offset (GScanner *scanner)
 748 {
 749   g_return_if_fail (scanner != NULL);
 750
 751   /* for file input, rewind the filedescriptor to the current
 752    * buffer position and blow the file read ahead buffer. usefull for
 753    * third party uses of our filedescriptor, which hooks onto the current
 754    * scanning position.
 755    */
 756
 757   if (scanner->input_fd >= 0 && scanner->text_end > scanner->text)
 758     {
 759       gint buffered;
 760
 761       buffered = scanner->text_end - scanner->text;
 762       if (lseek (scanner->input_fd, - buffered, SEEK_CUR) >= 0)
 763         {
 764           /* we succeeded, blow our buffer's contents now */
 765           scanner->text = NULL;
 766           scanner->text_end = NULL;
 767         }
 768       else
 769         errno = 0;
 770     }
 771 }
 772
 773 static guchar
 774 g_scanner_get_char (GScanner    *scanner,
 775                     guint       *line_p,
 776                     guint       *position_p)
 777 {
 778   register guchar fchar;
 779
 780   if (scanner->text < scanner->text_end)
 781     fchar = *(scanner->text++);
 782   else if (scanner->input_fd >= 0)
 783     {
 784       register gint count;
 785       register gchar *buffer;
 786
 787       buffer = scanner->buffer;
 788       do
 789         {
 790           count = read (scanner->input_fd, buffer, READ_BUFFER_SIZE);
 791         }
 792       while (count == -1 && (errno == EINTR || errno == EAGAIN));
 793
 794       if (count < 1)
 795         {
 796           scanner->input_fd = -1;
 797           fchar = 0;
 798         }
 799       else
 800         {
 801           scanner->text = buffer + 1;
 802           scanner->text_end = buffer + count;
 803           fchar = *buffer;
 804           if (!fchar)
 805             {
 806               g_scanner_sync_file_offset (scanner);
 807               scanner->text_end = scanner->text;
 808               scanner->input_fd = -1;
 809             }
 810         }
 811     }
 812   else
 813     fchar = 0;
 814
 815   if (fchar == '\n')
 816     {
 817       (*position_p) = 0;
 818       (*line_p)++;
 819     }
 820   else if (fchar)
 821     {
 822       (*position_p)++;
 823     }
 824
 825   return fchar;
 826 }
 827
 828 void
 829 g_scanner_unexp_token (GScanner         *scanner,
 830                        GTokenType        expected_token,
 831                        const gchar      *identifier_spec,
 832                        const gchar      *symbol_spec,
 833                        const gchar      *symbol_name,
 834                        const gchar      *message,
 835                        gint              is_error)
 836 {
 837   register gchar        *token_string;
 838   register guint        token_string_len;
 839   register gchar        *expected_string;
 840   register guint        expected_string_len;
 841   register gchar        *message_prefix;
 842   register gboolean     print_unexp;
 843   void (*msg_handler)   (GScanner*, const gchar*, ...);
 844
 845   g_return_if_fail (scanner != NULL);
 846
 847   if (is_error)
 848     msg_handler = g_scanner_error;
 849   else
 850     msg_handler = g_scanner_warn;
 851
 852   if (!identifier_spec)
 853     identifier_spec = "identifier";
 854   if (!symbol_spec)
 855     symbol_spec = "symbol";
 856
 857   token_string_len = 56;
 858   token_string = g_new (gchar, token_string_len + 1);
 859   expected_string_len = 64;
 860   expected_string = g_new (gchar, expected_string_len + 1);
 861   print_unexp = TRUE;
 862
 863   switch (scanner->token)
 864     {
 865     case  G_TOKEN_EOF:
 866       g_snprintf (token_string, token_string_len, "end of file");
 867       break;
 868
 869     default:
 870       if (scanner->token >= 1 && scanner->token <= 255)
 871         {
 872           if ((scanner->token >= ' ' && scanner->token <= '~') ||
 873               strchr (scanner->config->cset_identifier_first, scanner->token) ||
 874               strchr (scanner->config->cset_identifier_nth, scanner->token))
 875             g_snprintf (token_string, expected_string_len, "character `%c'", scanner->token);
 876           else
 877             g_snprintf (token_string, expected_string_len, "character `\\%o'", scanner->token);
 878           break;
 879         }
 880       else if (!scanner->config->symbol_2_token)
 881         {
 882           g_snprintf (token_string, token_string_len, "(unknown) token <%d>", scanner->token);
 883           break;
 884         }
 885       /* fall through */
 886     case  G_TOKEN_SYMBOL:
 887       if (expected_token == G_TOKEN_SYMBOL ||
 888           (scanner->config->symbol_2_token &&
 889            expected_token > G_TOKEN_LAST))
 890         print_unexp = FALSE;
 891       if (symbol_name)
 892         g_snprintf (token_string,
 893                     token_string_len,
 894                     "%s%s `%s'",
 895                     print_unexp ? "" : "invalid ",
 896                     symbol_spec,
 897                     symbol_name);
 898       else
 899         g_snprintf (token_string,
 900                     token_string_len,
 901                     "%s%s",
 902                     print_unexp ? "" : "invalid ",
 903                     symbol_spec);
 904       break;
 905
 906     case  G_TOKEN_ERROR:
 907       print_unexp = FALSE;
 908       expected_token = G_TOKEN_NONE;
 909       switch (scanner->value.v_error)
 910         {
 911         case  G_ERR_UNEXP_EOF:
 912           g_snprintf (token_string, token_string_len, "scanner: unexpected end of file");
 913           break;
 914
 915         case  G_ERR_UNEXP_EOF_IN_STRING:
 916           g_snprintf (token_string, token_string_len, "scanner: unterminated string constant");
 917           break;
 918
 919         case  G_ERR_UNEXP_EOF_IN_COMMENT:
 920           g_snprintf (token_string, token_string_len, "scanner: unterminated comment");
 921           break;
 922
 923         case  G_ERR_NON_DIGIT_IN_CONST:
 924           g_snprintf (token_string, token_string_len, "scanner: non digit in constant");
 925           break;
 926
 927         case  G_ERR_FLOAT_RADIX:
 928           g_snprintf (token_string, token_string_len, "scanner: invalid radix for floating constant");
 929           break;
 930
 931         case  G_ERR_FLOAT_MALFORMED:
 932           g_snprintf (token_string, token_string_len, "scanner: malformed floating constant");
 933           break;
 934
 935         case  G_ERR_DIGIT_RADIX:
 936           g_snprintf (token_string, token_string_len, "scanner: digit is beyond radix");
 937           break;
 938
 939         case  G_ERR_UNKNOWN:
 940         default:
 941           g_snprintf (token_string, token_string_len, "scanner: unknown error");
 942           break;
 943         }
 944       break;
 945
 946     case  G_TOKEN_CHAR:
 947       g_snprintf (token_string, token_string_len, "character `%c'", scanner->value.v_char);
 948       break;
 949
 950     case  G_TOKEN_IDENTIFIER:
 951       if (expected_token == G_TOKEN_IDENTIFIER)
 952         print_unexp = FALSE;
 953       g_snprintf (token_string,
 954                   token_string_len,
 955                   "%s%s `%s'",
 956                   print_unexp ? "" : "invalid ",
 957                   identifier_spec,
 958                   scanner->value.v_string);
 959       break;
 960
 961     case  G_TOKEN_BINARY:
 962     case  G_TOKEN_OCTAL:
 963     case  G_TOKEN_INT:
 964     case  G_TOKEN_HEX:
 965       g_snprintf (token_string, token_string_len, "number `%ld'", scanner->value.v_int);
 966       break;
 967
 968     case  G_TOKEN_FLOAT:
 969       g_snprintf (token_string, token_string_len, "number `%.3f'", scanner->value.v_float);
 970       break;
 971
 972     case  G_TOKEN_STRING:
 973       if (expected_token == G_TOKEN_STRING)
 974         print_unexp = FALSE;
 975       g_snprintf (token_string,
 976                   token_string_len,
 977                   "%s%sstring constant \"%s\"",
 978                   print_unexp ? "" : "invalid ",
 979                   scanner->value.v_string[0] == 0 ? "empty " : "",
 980                   scanner->value.v_string);
 981       token_string[token_string_len - 2] = '"';
 982       token_string[token_string_len - 1] = 0;
 983       break;
 984
 985     case  G_TOKEN_COMMENT_SINGLE:
 986     case  G_TOKEN_COMMENT_MULTI:
 987       g_snprintf (token_string, token_string_len, "comment");
 988       break;
 989
 990     case  G_TOKEN_NONE:
 991       /* somehow the user's parsing code is screwed, there isn't much
 992        * we can do about it.
 993        * Note, a common case to trigger this is
 994        * g_scanner_peek_next_token(); g_scanner_unexp_token();
 995        * without an intermediate g_scanner_get_next_token().
 996        */
 997       g_assert_not_reached ();
 998       break;
 999     }
1000
1001
1002   switch (expected_token)
1003     {
1004       gboolean need_valid;
1005
1006     default:
1007       if (expected_token >= 1 && expected_token <= 255)
1008         {
1009           if ((expected_token >= ' ' && expected_token <= '~') ||
1010               strchr (scanner->config->cset_identifier_first, expected_token) ||
1011               strchr (scanner->config->cset_identifier_nth, expected_token))
1012             g_snprintf (expected_string, expected_string_len, "character `%c'", expected_token);
1013           else
1014             g_snprintf (expected_string, expected_string_len, "character `\\%o'", expected_token);
1015           break;
1016         }
1017       else if (!scanner->config->symbol_2_token)
1018         {
1019           g_snprintf (expected_string, expected_string_len, "(unknown) token <%d>", expected_token);
1020           break;
1021         }
1022       /* fall through */
1023     case  G_TOKEN_SYMBOL:
1024       need_valid = (scanner->token == G_TOKEN_SYMBOL ||
1025                     (scanner->config->symbol_2_token &&
1026                      scanner->token > G_TOKEN_LAST));
1027       g_snprintf (expected_string,
1028                   expected_string_len,
1029                   "%s%s",
1030                   need_valid ? "valid " : "",
1031                   symbol_spec);
1032       /* FIXME: should we attempt to lookup the symbol_name for symbol_2_token? */
1033       break;
1034
1035     case  G_TOKEN_INT:
1036       g_snprintf (expected_string, expected_string_len, "number (integer)");
1037       break;
1038
1039     case  G_TOKEN_FLOAT:
1040       g_snprintf (expected_string, expected_string_len, "number (float)");
1041       break;
1042
1043     case  G_TOKEN_STRING:
1044       g_snprintf (expected_string,
1045                   expected_string_len,
1046                   "%sstring constant",
1047                   scanner->token == G_TOKEN_STRING ? "valid " : "");
1048       break;
1049
1050     case  G_TOKEN_IDENTIFIER:
1051       g_snprintf (expected_string,
1052                   expected_string_len,
1053                   "%s%s",
1054                   scanner->token == G_TOKEN_IDENTIFIER ? "valid " : "",
1055                   identifier_spec);
1056       break;
1057
1058     case  G_TOKEN_NONE:
1059       break;
1060     }
1061
1062   if (message && message[0] != 0)
1063     message_prefix = " - ";
1064   else
1065     {
1066       message_prefix = "";
1067       message = "";
1068     }
1069
1070   if (expected_token != G_TOKEN_NONE)
1071     {
1072       if (print_unexp)
1073         msg_handler (scanner,
1074                      "unexpected %s, expected %s%s%s",
1075                      token_string,
1076                      expected_string,
1077                      message_prefix,
1078                      message);
1079       else
1080         msg_handler (scanner,
1081                      "%s, expected %s%s%s",
1082                      token_string,
1083                      expected_string,
1084                      message_prefix,
1085                      message);
1086     }
1087   else
1088     {
1089       if (print_unexp)
1090         msg_handler (scanner,
1091                      "unexpected %s%s%s",
1092                      token_string,
1093                      message_prefix,
1094                      message);
1095       else
1096         msg_handler (scanner,
1097                      "%s%s%s",
1098                      token_string,
1099                      message_prefix,
1100                      message);
1101     }
1102
1103   g_free (token_string);
1104   g_free (expected_string);
1105 }
1106
1107 gint
1108 g_scanner_stat_mode (const gchar *filename)
1109 {
1110   struct stat  *stat_buf;
1111   gint          st_mode;
1112
1113   stat_buf = g_new0 (struct stat, 1);
1114 #ifdef HAVE_LSTAT
1115   lstat (filename, stat_buf);
1116 #else
1117   stat (filename, stat_buf);
1118 #endif
1119   st_mode = stat_buf->st_mode;
1120
1121   g_free (stat_buf);
1122
1123   return st_mode;
1124 }
1125
1126 static void
1127 g_scanner_get_token_i (GScanner *scanner,
1128                        GTokenType       *token_p,
1129                        GTokenValue      *value_p,
1130                        guint            *line_p,
1131                        guint            *position_p)
1132 {
1133   do
1134     {
1135       g_scanner_free_value (token_p, value_p);
1136       g_scanner_get_token_ll (scanner, token_p, value_p, line_p, position_p);
1137     }
1138   while (((*token_p > 0 && *token_p < 256) &&
1139           strchr (scanner->config->cset_skip_characters, *token_p)) ||
1140          (*token_p == G_TOKEN_CHAR &&
1141           strchr (scanner->config->cset_skip_characters, value_p->v_char)) ||
1142          (*token_p == G_TOKEN_COMMENT_MULTI &&
1143           scanner->config->skip_comment_multi) ||
1144          (*token_p == G_TOKEN_COMMENT_SINGLE &&
1145           scanner->config->skip_comment_single));
1146
1147   switch (*token_p)
1148     {
1149     case G_TOKEN_IDENTIFIER:
1150       if (scanner->config->identifier_2_string)
1151         *token_p = G_TOKEN_STRING;
1152       break;
1153
1154     case G_TOKEN_SYMBOL:
1155       if (scanner->config->symbol_2_token)
1156         *token_p = (GTokenType) value_p->v_symbol;
1157       break;
1158
1159     case G_TOKEN_BINARY:
1160     case G_TOKEN_OCTAL:
1161     case G_TOKEN_HEX:
1162       if (scanner->config->numbers_2_int)
1163         *token_p = G_TOKEN_INT;
1164       break;
1165
1166     default:
1167       break;
1168     }
1169
1170   if (*token_p == G_TOKEN_INT &&
1171       scanner->config->int_2_float)
1172     {
1173       *token_p = G_TOKEN_FLOAT;
1174       value_p->v_float = value_p->v_int;
1175     }
1176
1177   errno = 0;
1178 }
1179
1180 static void
1181 g_scanner_get_token_ll  (GScanner       *scanner,
1182                          GTokenType     *token_p,
1183                          GTokenValue    *value_p,
1184                          guint          *line_p,
1185                          guint          *position_p)
1186 {
1187   register GScannerConfig *config;
1188   register GTokenType      token;
1189   register gboolean        in_comment_multi;
1190   register gboolean        in_comment_single;
1191   register gboolean        in_string_sq;
1192   register gboolean        in_string_dq;
1193   register GString        *gstring;
1194   GTokenValue              value;
1195   guchar                   ch;
1196
1197   config = scanner->config;
1198   (*value_p).v_int = 0;
1199
1200   if ((scanner->text >= scanner->text_end && scanner->input_fd < 0) ||
1201       scanner->token == G_TOKEN_EOF)
1202     {
1203       *token_p = G_TOKEN_EOF;
1204       return;
1205     }
1206
1207   in_comment_multi = FALSE;
1208   in_comment_single = FALSE;
1209   in_string_sq = FALSE;
1210   in_string_dq = FALSE;
1211   gstring = NULL;
1212
1213   do /* while (ch != 0) */
1214     {
1215       register gboolean         dotted_float = FALSE;
1216
1217       ch = g_scanner_get_char (scanner, line_p, position_p);
1218
1219       value.v_int = 0;
1220       token = G_TOKEN_NONE;
1221
1222       /* this is *evil*, but needed ;(
1223        * we first check for identifier first character, because  it
1224        * might interfere with other key chars like slashes or numbers
1225        */
1226       if (config->scan_identifier &&
1227           ch && strchr (config->cset_identifier_first, ch))
1228         goto identifier_precedence;
1229
1230       switch (ch)
1231         {
1232         case  0:
1233           token = G_TOKEN_EOF;
1234           (*position_p)++;
1235           /* ch = 0; */
1236           break;
1237
1238         case  '/':
1239           if (!config->scan_comment_multi ||
1240               g_scanner_peek_next_char (scanner) != '*')
1241             goto default_case;
1242           g_scanner_get_char (scanner, line_p, position_p);
1243           token = G_TOKEN_COMMENT_MULTI;
1244           in_comment_multi = TRUE;
1245           gstring = g_string_new ("");
1246           while ((ch = g_scanner_get_char (scanner, line_p, position_p)) != 0)
1247             {
1248               if (ch == '*' && g_scanner_peek_next_char (scanner) == '/')
1249                 {
1250                   g_scanner_get_char (scanner, line_p, position_p);
1251                   in_comment_multi = FALSE;
1252                   break;
1253                 }
1254               else
1255                 gstring = g_string_append_c (gstring, ch);
1256             }
1257           ch = 0;
1258           break;
1259
1260         case  '\'':
1261           if (!config->scan_string_sq)
1262             goto default_case;
1263           token = G_TOKEN_STRING;
1264           in_string_sq = TRUE;
1265           gstring = g_string_new ("");
1266           while ((ch = g_scanner_get_char (scanner, line_p, position_p)) != 0)
1267             {
1268               if (ch == '\'')
1269                 {
1270                   in_string_sq = FALSE;
1271                   break;
1272                 }
1273               else
1274                 gstring = g_string_append_c (gstring, ch);
1275             }
1276           ch = 0;
1277           break;
1278
1279         case  '"':
1280           if (!config->scan_string_dq)
1281             goto default_case;
1282           token = G_TOKEN_STRING;
1283           in_string_dq = TRUE;
1284           gstring = g_string_new ("");
1285           while ((ch = g_scanner_get_char (scanner, line_p, position_p)) != 0)
1286             {
1287               if (ch == '"')
1288                 {
1289                   in_string_dq = FALSE;
1290                   break;
1291                 }
1292               else
1293                 {
1294                   if (ch == '\\')
1295                     {
1296                       ch = g_scanner_get_char (scanner, line_p, position_p);
1297                       switch (ch)
1298                         {
1299                           register guint        i;
1300                           register guint        fchar;
1301
1302                         case  0:
1303                           break;
1304
1305                         case  '\\':
1306                           gstring = g_string_append_c (gstring, '\\');
1307                           break;
1308
1309                         case  'n':
1310                           gstring = g_string_append_c (gstring, '\n');
1311                           break;
1312
1313                         case  't':
1314                           gstring = g_string_append_c (gstring, '\t');
1315                           break;
1316
1317                         case  'r':
1318                           gstring = g_string_append_c (gstring, '\r');
1319                           break;
1320
1321                         case  'b':
1322                           gstring = g_string_append_c (gstring, '\b');
1323                           break;
1324
1325                         case  'f':
1326                           gstring = g_string_append_c (gstring, '\f');
1327                           break;
1328
1329                         case  '0':
1330                         case  '1':
1331                         case  '2':
1332                         case  '3':
1333                         case  '4':
1334                         case  '5':
1335                         case  '6':
1336                         case  '7':
1337                           i = ch - '0';
1338                           fchar = g_scanner_peek_next_char (scanner);
1339                           if (fchar >= '0' && fchar <= '7')
1340                             {
1341                               ch = g_scanner_get_char (scanner, line_p, position_p);
1342                               i = i * 8 + ch - '0';
1343                               fchar = g_scanner_peek_next_char (scanner);
1344                               if (fchar >= '0' && fchar <= '7')
1345                                 {
1346                                   ch = g_scanner_get_char (scanner, line_p, position_p);
1347                                   i = i * 8 + ch - '0';
1348                                 }
1349                             }
1350                           gstring = g_string_append_c (gstring, i);
1351                           break;
1352
1353                         default:
1354                           gstring = g_string_append_c (gstring, ch);
1355                           break;
1356                         }
1357                     }
1358                   else
1359                     gstring = g_string_append_c (gstring, ch);
1360                 }
1361             }
1362           ch = 0;
1363           break;
1364
1365         case  '.':
1366           if (!config->scan_float)
1367             goto default_case;
1368           token = G_TOKEN_FLOAT;
1369           dotted_float = TRUE;
1370           ch = g_scanner_get_char (scanner, line_p, position_p);
1371           goto number_parsing;
1372
1373         case  '$':
1374           if (!config->scan_hex_dollar)
1375             goto default_case;
1376           token = G_TOKEN_HEX;
1377           ch = g_scanner_get_char (scanner, line_p, position_p);
1378           goto number_parsing;
1379
1380         case  '0':
1381           if (config->scan_octal)
1382             token = G_TOKEN_OCTAL;
1383           else
1384             token = G_TOKEN_INT;
1385           ch = g_scanner_peek_next_char (scanner);
1386           if (config->scan_hex && (ch == 'x' || ch == 'X'))
1387             {
1388               token = G_TOKEN_HEX;
1389               g_scanner_get_char (scanner, line_p, position_p);
1390               ch = g_scanner_get_char (scanner, line_p, position_p);
1391               if (ch == 0)
1392                 {
1393                   token = G_TOKEN_ERROR;
1394                   value.v_error = G_ERR_UNEXP_EOF;
1395                   (*position_p)++;
1396                   break;
1397                 }
1398               if (g_scanner_char_2_num (ch, 16) < 0)
1399                 {
1400                   token = G_TOKEN_ERROR;
1401                   value.v_error = G_ERR_DIGIT_RADIX;
1402                   ch = 0;
1403                   break;
1404                 }
1405             }
1406           else if (config->scan_binary && (ch == 'b' || ch == 'B'))
1407             {
1408               token = G_TOKEN_BINARY;
1409               g_scanner_get_char (scanner, line_p, position_p);
1410               ch = g_scanner_get_char (scanner, line_p, position_p);
1411               if (ch == 0)
1412                 {
1413                   token = G_TOKEN_ERROR;
1414                   value.v_error = G_ERR_UNEXP_EOF;
1415                   (*position_p)++;
1416                   break;
1417                 }
1418               if (g_scanner_char_2_num (ch, 10) < 0)
1419                 {
1420                   token = G_TOKEN_ERROR;
1421                   value.v_error = G_ERR_NON_DIGIT_IN_CONST;
1422                   ch = 0;
1423                   break;
1424                 }
1425             }
1426           else
1427             ch = '0';
1428           /* fall through */
1429         case  '1':
1430         case  '2':
1431         case  '3':
1432         case  '4':
1433         case  '5':
1434         case  '6':
1435         case  '7':
1436         case  '8':
1437         case  '9':
1438         number_parsing:
1439         {
1440           register gboolean in_number = TRUE;
1441           gchar *endptr;
1442
1443           if (token == G_TOKEN_NONE)
1444             token = G_TOKEN_INT;
1445
1446           gstring = g_string_new (dotted_float ? "0." : "");
1447           gstring = g_string_append_c (gstring, ch);
1448
1449           do /* while (in_number) */
1450             {
1451               register gboolean is_E;
1452
1453               is_E = token == G_TOKEN_FLOAT && (ch == 'e' || ch == 'E');
1454
1455               ch = g_scanner_peek_next_char (scanner);
1456
1457               if (g_scanner_char_2_num (ch, 36) >= 0 ||
1458                   (config->scan_float && ch == '.') ||
1459                   (is_E && (ch == '+' || ch == '-')))
1460                 {
1461                   ch = g_scanner_get_char (scanner, line_p, position_p);
1462
1463                   switch (ch)
1464                     {
1465                     case '.':
1466                       if (token != G_TOKEN_INT && token != G_TOKEN_OCTAL)
1467                         {
1468                           value.v_error = token == G_TOKEN_FLOAT ? G_ERR_FLOAT_MALFORMED : G_ERR_FLOAT_RADIX;
1469                           token = G_TOKEN_ERROR;
1470                           in_number = FALSE;
1471                         }
1472                       else
1473                         {
1474                           token = G_TOKEN_FLOAT;
1475                           gstring = g_string_append_c (gstring, ch);
1476                         }
1477                       break;
1478
1479                     case '0':
1480                     case '1':
1481                     case '2':
1482                     case '3':
1483                     case '4':
1484                     case '5':
1485                     case '6':
1486                     case '7':
1487                     case '8':
1488                     case '9':
1489                       gstring = g_string_append_c (gstring, ch);
1490                       break;
1491
1492                     case '-':
1493                     case '+':
1494                       if (token != G_TOKEN_FLOAT)
1495                         {
1496                           token = G_TOKEN_ERROR;
1497                           value.v_error = G_ERR_NON_DIGIT_IN_CONST;
1498                           in_number = FALSE;
1499                         }
1500                       else
1501                         gstring = g_string_append_c (gstring, ch);
1502                       break;
1503
1504                     case 'e':
1505                     case 'E':
1506                       if ((token != G_TOKEN_HEX && !config->scan_float) ||
1507                           (token != G_TOKEN_HEX &&
1508                            token != G_TOKEN_OCTAL &&
1509                            token != G_TOKEN_FLOAT &&
1510                            token != G_TOKEN_INT))
1511                         {
1512                           token = G_TOKEN_ERROR;
1513                           value.v_error = G_ERR_NON_DIGIT_IN_CONST;
1514                           in_number = FALSE;
1515                         }
1516                       else
1517                         {
1518                           if (token != G_TOKEN_HEX)
1519                             token = G_TOKEN_FLOAT;
1520                           gstring = g_string_append_c (gstring, ch);
1521                         }
1522                       break;
1523
1524                     default:
1525                       if (token != G_TOKEN_HEX)
1526                         {
1527                           token = G_TOKEN_ERROR;
1528                           value.v_error = G_ERR_NON_DIGIT_IN_CONST;
1529                           in_number = FALSE;
1530                         }
1531                       else
1532                         gstring = g_string_append_c (gstring, ch);
1533                       break;
1534                     }
1535                 }
1536               else
1537                 in_number = FALSE;
1538             }
1539           while (in_number);
1540
1541           endptr = NULL;
1542           switch (token)
1543             {
1544             case G_TOKEN_BINARY:
1545               value.v_binary = strtol (gstring->str, &endptr, 2);
1546               break;
1547
1548             case G_TOKEN_OCTAL:
1549               value.v_octal = strtol (gstring->str, &endptr, 8);
1550               break;
1551
1552             case G_TOKEN_INT:
1553               value.v_int = strtol (gstring->str, &endptr, 10);
1554               break;
1555
1556             case G_TOKEN_FLOAT:
1557               value.v_float = g_strtod (gstring->str, &endptr);
1558               break;
1559
1560             case G_TOKEN_HEX:
1561               value.v_hex = strtol (gstring->str, &endptr, 16);
1562               break;
1563
1564             default:
1565               break;
1566             }
1567           if (endptr && *endptr)
1568             {
1569               token = G_TOKEN_ERROR;
1570               if (*endptr == 'e' || *endptr == 'E')
1571                 value.v_error = G_ERR_NON_DIGIT_IN_CONST;
1572               else
1573                 value.v_error = G_ERR_DIGIT_RADIX;
1574             }
1575           g_string_free (gstring, TRUE);
1576           gstring = NULL;
1577           ch = 0;
1578         } /* number_parsing:... */
1579         break;
1580
1581         default:
1582         default_case:
1583         {
1584           if (config->cpair_comment_single &&
1585               ch == config->cpair_comment_single[0])
1586             {
1587               token = G_TOKEN_COMMENT_SINGLE;
1588               in_comment_single = TRUE;
1589               gstring = g_string_new ("");
1590               while ((ch = g_scanner_get_char (scanner,
1591                                                line_p,
1592                                                position_p)) != 0)
1593                 {
1594                   if (ch == config->cpair_comment_single[1])
1595                     {
1596                       in_comment_single = FALSE;
1597                       ch = 0;
1598                       break;
1599                     }
1600
1601                   gstring = g_string_append_c (gstring, ch);
1602                   ch = 0;
1603                 }
1604             }
1605           else if (config->scan_identifier && ch &&
1606                    strchr (config->cset_identifier_first, ch))
1607             {
1608             identifier_precedence:
1609
1610               if (config->cset_identifier_nth && ch &&
1611                   strchr (config->cset_identifier_nth,
1612                           g_scanner_peek_next_char (scanner)))
1613                 {
1614                   token = G_TOKEN_IDENTIFIER;
1615                   gstring = g_string_new ("");
1616                   gstring = g_string_append_c (gstring, ch);
1617                   do
1618                     {
1619                       ch = g_scanner_get_char (scanner, line_p, position_p);
1620                       gstring = g_string_append_c (gstring, ch);
1621                       ch = g_scanner_peek_next_char (scanner);
1622                     }
1623                   while (ch && strchr (config->cset_identifier_nth, ch));
1624                   ch = 0;
1625                 }
1626               else if (config->scan_identifier_1char)
1627                 {
1628                   token = G_TOKEN_IDENTIFIER;
1629                   value.v_identifier = g_new0 (gchar, 2);
1630                   value.v_identifier[0] = ch;
1631                   ch = 0;
1632                 }
1633             }
1634           if (ch)
1635             {
1636               if (config->char_2_token)
1637                 token = ch;
1638               else
1639                 {
1640                   token = G_TOKEN_CHAR;
1641                   value.v_char = ch;
1642                 }
1643               ch = 0;
1644             }
1645         } /* default_case:... */
1646         break;
1647         }
1648       g_assert (ch == 0 && token != G_TOKEN_NONE); /* paranoid */
1649     }
1650   while (ch != 0);
1651
1652   if (in_comment_multi || in_comment_single ||
1653       in_string_sq || in_string_dq)
1654     {
1655       token = G_TOKEN_ERROR;
1656       if (gstring)
1657         {
1658           g_string_free (gstring, TRUE);
1659           gstring = NULL;
1660         }
1661       (*position_p)++;
1662       if (in_comment_multi || in_comment_single)
1663         value.v_error = G_ERR_UNEXP_EOF_IN_COMMENT;
1664       else /* (in_string_sq || in_string_dq) */
1665         value.v_error = G_ERR_UNEXP_EOF_IN_STRING;
1666     }
1667
1668   if (gstring)
1669     {
1670       value.v_string = gstring->str;
1671       g_string_free (gstring, FALSE);
1672       gstring = NULL;
1673     }
1674
1675   if (token == G_TOKEN_IDENTIFIER)
1676     {
1677       if (config->scan_symbols)
1678         {
1679           register GScannerKey  *key;
1680           register guint scope_id;
1681
1682           scope_id = scanner->scope_id;
1683           key = g_scanner_lookup_internal (scanner, scope_id, value.v_identifier);
1684           if (!key && scope_id && scanner->config->scope_0_fallback)
1685             key = g_scanner_lookup_internal (scanner, 0, value.v_identifier);
1686
1687           if (key)
1688             {
1689               g_free (value.v_identifier);
1690               token = G_TOKEN_SYMBOL;
1691               value.v_symbol = key->value;
1692             }
1693         }
1694
1695       if (token == G_TOKEN_IDENTIFIER &&
1696           config->scan_identifier_NULL &&
1697           strlen (value.v_identifier) == 4)
1698         {
1699           gchar *null_upper = "NULL";
1700           gchar *null_lower = "null";
1701
1702           if (scanner->config->case_sensitive)
1703             {
1704               if (value.v_identifier[0] == null_upper[0] &&
1705                   value.v_identifier[1] == null_upper[1] &&
1706                   value.v_identifier[2] == null_upper[2] &&
1707                   value.v_identifier[3] == null_upper[3])
1708                 token = G_TOKEN_IDENTIFIER_NULL;
1709             }
1710           else
1711             {
1712               if ((value.v_identifier[0] == null_upper[0] ||
1713                    value.v_identifier[0] == null_lower[0]) &&
1714                   (value.v_identifier[1] == null_upper[1] ||
1715                    value.v_identifier[1] == null_lower[1]) &&
1716                   (value.v_identifier[2] == null_upper[2] ||
1717                    value.v_identifier[2] == null_lower[2]) &&
1718                   (value.v_identifier[3] == null_upper[3] ||
1719                    value.v_identifier[3] == null_lower[3]))
1720                 token = G_TOKEN_IDENTIFIER_NULL;
1721             }
1722         }
1723     }
1724
1725   *token_p = token;
1726   *value_p = value;
1727 }