libcpp/internal.h

   1 /* Part of CPP library.
   2    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
   3    Free Software Foundation, Inc.
   4
   5 This program is free software; you can redistribute it and/or modify it
   6 under the terms of the GNU General Public License as published by the
   7 Free Software Foundation; either version 2, or (at your option) any
   8 later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  18
  19 /* This header defines all the internal data structures and functions
  20    that need to be visible across files.  It should not be used outside
  21    cpplib.  */
  22
  23 #ifndef LIBCPP_INTERNAL_H
  24 #define LIBCPP_INTERNAL_H
  25
  26 #include "symtab.h"
  27 #include "cpp-id-data.h"
  28
  29 #ifndef HAVE_ICONV_H
  30 #undef HAVE_ICONV
  31 #endif
  32
  33 #if HAVE_ICONV
  34 #include <iconv.h>
  35 #else
  36 #define HAVE_ICONV 0
  37 typedef int iconv_t;  /* dummy */
  38 #endif
  39
  40 struct directive;               /* Deliberately incomplete.  */
  41 struct pending_option;
  42 struct op;
  43 struct _cpp_strbuf;
  44
  45 typedef bool (*convert_f) (iconv_t, const unsigned char *, size_t,
  46                            struct _cpp_strbuf *);
  47 struct cset_converter
  48 {
  49   convert_f func;
  50   iconv_t cd;
  51 };
  52
  53 #define BITS_PER_CPPCHAR_T (CHAR_BIT * sizeof (cppchar_t))
  54
  55 /* Test if a sign is valid within a preprocessing number.  */
  56 #define VALID_SIGN(c, prevc) \
  57   (((c) == '+' || (c) == '-') && \
  58    ((prevc) == 'e' || (prevc) == 'E' \
  59     || (((prevc) == 'p' || (prevc) == 'P') \
  60         && CPP_OPTION (pfile, extended_numbers))))
  61
  62 #define CPP_OPTION(PFILE, OPTION) ((PFILE)->opts.OPTION)
  63 #define CPP_BUFFER(PFILE) ((PFILE)->buffer)
  64 #define CPP_BUF_COLUMN(BUF, CUR) ((CUR) - (BUF)->line_base)
  65 #define CPP_BUF_COL(BUF) CPP_BUF_COLUMN(BUF, (BUF)->cur)
  66
  67 #define CPP_INCREMENT_LINE(PFILE, COLS_HINT) do { \
  68     const struct line_maps *line_table = PFILE->line_table; \
  69     const struct line_map *map = &line_table->maps[line_table->used-1]; \
  70     unsigned int line = SOURCE_LINE (map, line_table->highest_line); \
  71     linemap_line_start (PFILE->line_table, line + 1, COLS_HINT); \
  72   } while (0)
  73
  74 /* Maximum nesting of cpp_buffers.  We use a static limit, partly for
  75    efficiency, and partly to limit runaway recursion.  */
  76 #define CPP_STACK_MAX 200
  77
  78 /* Host alignment handling.  */
  79 struct dummy
  80 {
  81   char c;
  82   union
  83   {
  84     double d;
  85     int *p;
  86   } u;
  87 };
  88
  89 #define DEFAULT_ALIGNMENT offsetof (struct dummy, u)
  90 #define CPP_ALIGN2(size, align) (((size) + ((align) - 1)) & ~((align) - 1))
  91 #define CPP_ALIGN(size) CPP_ALIGN2 (size, DEFAULT_ALIGNMENT)
  92
  93 #define _cpp_mark_macro_used(NODE) do {                                 \
  94   if ((NODE)->type == NT_MACRO && !((NODE)->flags & NODE_BUILTIN))      \
  95     (NODE)->value.macro->used = 1; } while (0)
  96
  97 /* A generic memory buffer, and operations on it.  */
  98 typedef struct _cpp_buff _cpp_buff;
  99 struct _cpp_buff
 100 {
 101   struct _cpp_buff *next;
 102   unsigned char *base, *cur, *limit;
 103 };
 104
 105 extern _cpp_buff *_cpp_get_buff (cpp_reader *, size_t);
 106 extern void _cpp_release_buff (cpp_reader *, _cpp_buff *);
 107 extern void _cpp_extend_buff (cpp_reader *, _cpp_buff **, size_t);
 108 extern _cpp_buff *_cpp_append_extend_buff (cpp_reader *, _cpp_buff *, size_t);
 109 extern void _cpp_free_buff (_cpp_buff *);
 110 extern unsigned char *_cpp_aligned_alloc (cpp_reader *, size_t);
 111 extern unsigned char *_cpp_unaligned_alloc (cpp_reader *, size_t);
 112
 113 #define BUFF_ROOM(BUFF) (size_t) ((BUFF)->limit - (BUFF)->cur)
 114 #define BUFF_FRONT(BUFF) ((BUFF)->cur)
 115 #define BUFF_LIMIT(BUFF) ((BUFF)->limit)
 116
 117 /* #include types.  */
 118 enum include_type {IT_INCLUDE, IT_INCLUDE_NEXT, IT_IMPORT, IT_CMDLINE};
 119
 120 union utoken
 121 {
 122   const cpp_token *token;
 123   const cpp_token **ptoken;
 124 };
 125
 126 /* A "run" of tokens; part of a chain of runs.  */
 127 typedef struct tokenrun tokenrun;
 128 struct tokenrun
 129 {
 130   tokenrun *next, *prev;
 131   cpp_token *base, *limit;
 132 };
 133
 134 /* Accessor macros for struct cpp_context.  */
 135 #define FIRST(c) ((c)->u.iso.first)
 136 #define LAST(c) ((c)->u.iso.last)
 137 #define CUR(c) ((c)->u.trad.cur)
 138 #define RLIMIT(c) ((c)->u.trad.rlimit)
 139
 140 typedef struct cpp_context cpp_context;
 141 struct cpp_context
 142 {
 143   /* Doubly-linked list.  */
 144   cpp_context *next, *prev;
 145
 146   union
 147   {
 148     /* For ISO macro expansion.  Contexts other than the base context
 149        are contiguous tokens.  e.g. macro expansions, expanded
 150        argument tokens.  */
 151     struct
 152     {
 153       union utoken first;
 154       union utoken last;
 155     } iso;
 156
 157     /* For traditional macro expansion.  */
 158     struct
 159     {
 160       const unsigned char *cur;
 161       const unsigned char *rlimit;
 162     } trad;
 163   } u;
 164
 165   /* If non-NULL, a buffer used for storage related to this context.
 166      When the context is popped, the buffer is released.  */
 167   _cpp_buff *buff;
 168
 169   /* For a macro context, the macro node, otherwise NULL.  */
 170   cpp_hashnode *macro;
 171
 172   /* True if utoken element is token, else ptoken.  */
 173   bool direct_p;
 174 };
 175
 176 struct lexer_state
 177 {
 178   /* Nonzero if first token on line is CPP_HASH.  */
 179   unsigned char in_directive;
 180
 181   /* Nonzero if in a directive that will handle padding tokens itself.
 182      #include needs this to avoid problems with computed include and
 183      spacing between tokens.  */
 184   unsigned char directive_wants_padding;
 185
 186   /* True if we are skipping a failed conditional group.  */
 187   unsigned char skipping;
 188
 189   /* Nonzero if in a directive that takes angle-bracketed headers.  */
 190   unsigned char angled_headers;
 191
 192   /* Nonzero if in a #if or #elif directive.  */
 193   unsigned char in_expression;
 194
 195   /* Nonzero to save comments.  Turned off if discard_comments, and in
 196      all directives apart from #define.  */
 197   unsigned char save_comments;
 198
 199   /* Nonzero if lexing __VA_ARGS__ is valid.  */
 200   unsigned char va_args_ok;
 201
 202   /* Nonzero if lexing poisoned identifiers is valid.  */
 203   unsigned char poisoned_ok;
 204
 205   /* Nonzero to prevent macro expansion.  */
 206   unsigned char prevent_expansion;
 207
 208   /* Nonzero when parsing arguments to a function-like macro.  */
 209   unsigned char parsing_args;
 210
 211   /* Nonzero if prevent_expansion is true only because output is
 212      being discarded.  */
 213   unsigned char discarding_output;
 214
 215   /* Nonzero to skip evaluating part of an expression.  */
 216   unsigned int skip_eval;
 217
 218   /* Nonzero when handling a deferred pragma.  */
 219   unsigned char in_deferred_pragma;
 220
 221   /* Nonzero if the deferred pragma being handled allows macro expansion.  */
 222   unsigned char pragma_allow_expansion;
 223 };
 224
 225 /* Special nodes - identifiers with predefined significance.  */
 226 struct spec_nodes
 227 {
 228   cpp_hashnode *n_defined;              /* defined operator */
 229   cpp_hashnode *n_true;                 /* C++ keyword true */
 230   cpp_hashnode *n_false;                /* C++ keyword false */
 231   cpp_hashnode *n__VA_ARGS__;           /* C99 vararg macros */
 232 };
 233
 234 typedef struct _cpp_line_note _cpp_line_note;
 235 struct _cpp_line_note
 236 {
 237   /* Location in the clean line the note refers to.  */
 238   const unsigned char *pos;
 239
 240   /* Type of note.  The 9 'from' trigraph characters represent those
 241      trigraphs, '\\' an escaped newline, ' ' an escaped newline with
 242      intervening space, and anything else is invalid.  */
 243   unsigned int type;
 244 };
 245
 246 /* Represents the contents of a file cpplib has read in.  */
 247 struct cpp_buffer
 248 {
 249   const unsigned char *cur;        /* Current location.  */
 250   const unsigned char *line_base;  /* Start of current physical line.  */
 251   const unsigned char *next_line;  /* Start of to-be-cleaned logical line.  */
 252
 253   const unsigned char *buf;        /* Entire character buffer.  */
 254   const unsigned char *rlimit;     /* Writable byte at end of file.  */
 255
 256   _cpp_line_note *notes;           /* Array of notes.  */
 257   unsigned int cur_note;           /* Next note to process.  */
 258   unsigned int notes_used;         /* Number of notes.  */
 259   unsigned int notes_cap;          /* Size of allocated array.  */
 260
 261   struct cpp_buffer *prev;
 262
 263   /* Pointer into the file table; non-NULL if this is a file buffer.
 264      Used for include_next and to record control macros.  */
 265   struct _cpp_file *file;
 266
 267   /* Saved value of __TIMESTAMP__ macro - date and time of last modification
 268      of the assotiated file.  */
 269   const unsigned char *timestamp;
 270
 271   /* Value of if_stack at start of this file.
 272      Used to prohibit unmatched #endif (etc) in an include file.  */
 273   struct if_stack *if_stack;
 274
 275   /* True if we need to get the next clean line.  */
 276   bool need_line;
 277
 278   /* True if we have already warned about C++ comments in this file.
 279      The warning happens only for C89 extended mode with -pedantic on,
 280      or for -Wtraditional, and only once per file (otherwise it would
 281      be far too noisy).  */
 282   unsigned int warned_cplusplus_comments : 1;
 283
 284   /* True if we don't process trigraphs and escaped newlines.  True
 285      for preprocessed input, command line directives, and _Pragma
 286      buffers.  */
 287   unsigned int from_stage3 : 1;
 288
 289   /* At EOF, a buffer is automatically popped.  If RETURN_AT_EOF is
 290      true, a CPP_EOF token is then returned.  Otherwise, the next
 291      token from the enclosing buffer is returned.  */
 292   unsigned int return_at_eof : 1;
 293
 294   /* One for a system header, two for a C system header file that therefore
 295      needs to be extern "C" protected in C++, and zero otherwise.  */
 296   unsigned char sysp;
 297
 298   /* The directory of the this buffer's file.  Its NAME member is not
 299      allocated, so we don't need to worry about freeing it.  */
 300   struct cpp_dir dir;
 301
 302   /* Descriptor for converting from the input character set to the
 303      source character set.  */
 304   struct cset_converter input_cset_desc;
 305 };
 306
 307 /* A cpp_reader encapsulates the "state" of a pre-processor run.
 308    Applying cpp_get_token repeatedly yields a stream of pre-processor
 309    tokens.  Usually, there is only one cpp_reader object active.  */
 310 struct cpp_reader
 311 {
 312   /* Top of buffer stack.  */
 313   cpp_buffer *buffer;
 314
 315   /* Overlaid buffer (can be different after processing #include).  */
 316   cpp_buffer *overlaid_buffer;
 317
 318   /* Lexer state.  */
 319   struct lexer_state state;
 320
 321   /* Source line tracking.  */
 322   struct line_maps *line_table;
 323
 324   /* The line of the '#' of the current directive.  */
 325   source_location directive_line;
 326
 327   /* Memory buffers.  */
 328   _cpp_buff *a_buff;            /* Aligned permanent storage.  */
 329   _cpp_buff *u_buff;            /* Unaligned permanent storage.  */
 330   _cpp_buff *free_buffs;        /* Free buffer chain.  */
 331
 332   /* Context stack.  */
 333   struct cpp_context base_context;
 334   struct cpp_context *context;
 335
 336   /* If in_directive, the directive if known.  */
 337   const struct directive *directive;
 338
 339   /* Token generated while handling a directive, if any. */
 340   cpp_token directive_result;
 341
 342   /* Search paths for include files.  */
 343   struct cpp_dir *quote_include;        /* "" */
 344   struct cpp_dir *bracket_include;      /* <> */
 345   struct cpp_dir no_search_path;        /* No path.  */
 346
 347   /* Chain of all hashed _cpp_file instances.  */
 348   struct _cpp_file *all_files;
 349
 350   struct _cpp_file *main_file;
 351
 352   /* File and directory hash table.  */
 353   struct htab *file_hash;
 354   struct htab *dir_hash;
 355   struct file_hash_entry *file_hash_entries;
 356   unsigned int file_hash_entries_allocated, file_hash_entries_used;
 357
 358   /* Nonzero means don't look for #include "foo" the source-file
 359      directory.  */
 360   bool quote_ignores_source_dir;
 361
 362   /* Nonzero if any file has contained #pragma once or #import has
 363      been used.  */
 364   bool seen_once_only;
 365
 366   /* Multiple include optimization.  */
 367   const cpp_hashnode *mi_cmacro;
 368   const cpp_hashnode *mi_ind_cmacro;
 369   bool mi_valid;
 370
 371   /* Lexing.  */
 372   cpp_token *cur_token;
 373   tokenrun base_run, *cur_run;
 374   unsigned int lookaheads;
 375
 376   /* Nonzero prevents the lexer from re-using the token runs.  */
 377   unsigned int keep_tokens;
 378
 379   /* Error counter for exit code.  */
 380   unsigned int errors;
 381
 382   /* Buffer to hold macro definition string.  */
 383   unsigned char *macro_buffer;
 384   unsigned int macro_buffer_len;
 385
 386   /* Descriptor for converting from the source character set to the
 387      execution character set.  */
 388   struct cset_converter narrow_cset_desc;
 389
 390   /* Descriptor for converting from the source character set to the
 391      wide execution character set.  */
 392   struct cset_converter wide_cset_desc;
 393
 394   /* Date and time text.  Calculated together if either is requested.  */
 395   const unsigned char *date;
 396   const unsigned char *time;
 397
 398   /* EOF token, and a token forcing paste avoidance.  */
 399   cpp_token avoid_paste;
 400   cpp_token eof;
 401
 402   /* Opaque handle to the dependencies of mkdeps.c.  */
 403   struct deps *deps;
 404
 405   /* Obstack holding all macro hash nodes.  This never shrinks.
 406      See identifiers.c */
 407   struct obstack hash_ob;
 408
 409   /* Obstack holding buffer and conditional structures.  This is a
 410      real stack.  See directives.c.  */
 411   struct obstack buffer_ob;
 412
 413   /* Pragma table - dynamic, because a library user can add to the
 414      list of recognized pragmas.  */
 415   struct pragma_entry *pragmas;
 416
 417   /* Call backs to cpplib client.  */
 418   struct cpp_callbacks cb;
 419
 420   /* Identifier hash table.  */
 421   struct ht *hash_table;
 422
 423   /* Expression parser stack.  */
 424   struct op *op_stack, *op_limit;
 425
 426   /* User visible options.  */
 427   struct cpp_options opts;
 428
 429   /* Special nodes - identifiers with predefined significance to the
 430      preprocessor.  */
 431   struct spec_nodes spec_nodes;
 432
 433   /* Whether cpplib owns the hashtable.  */
 434   bool our_hashtable;
 435
 436   /* Traditional preprocessing output buffer (a logical line).  */
 437   struct
 438   {
 439     unsigned char *base;
 440     unsigned char *limit;
 441     unsigned char *cur;
 442     source_location first_line;
 443   } out;
 444
 445   /* Used for buffer overlays by traditional.c.  */
 446   const unsigned char *saved_cur, *saved_rlimit, *saved_line_base;
 447
 448   /* A saved list of the defined macros, for dependency checking
 449      of precompiled headers.  */
 450   struct cpp_savedstate *savedstate;
 451 };
 452
 453 /* Character classes.  Based on the more primitive macros in safe-ctype.h.
 454    If the definition of `numchar' looks odd to you, please look up the
 455    definition of a pp-number in the C standard [section 6.4.8 of C99].
 456
 457    In the unlikely event that characters other than \r and \n enter
 458    the set is_vspace, the macro handle_newline() in lex.c must be
 459    updated.  */
 460 #define _dollar_ok(x)   ((x) == '$' && CPP_OPTION (pfile, dollars_in_ident))
 461
 462 #define is_idchar(x)    (ISIDNUM(x) || _dollar_ok(x))
 463 #define is_numchar(x)   ISIDNUM(x)
 464 #define is_idstart(x)   (ISIDST(x) || _dollar_ok(x))
 465 #define is_numstart(x)  ISDIGIT(x)
 466 #define is_hspace(x)    ISBLANK(x)
 467 #define is_vspace(x)    IS_VSPACE(x)
 468 #define is_nvspace(x)   IS_NVSPACE(x)
 469 #define is_space(x)     IS_SPACE_OR_NUL(x)
 470
 471 /* This table is constant if it can be initialized at compile time,
 472    which is the case if cpp was compiled with GCC >=2.7, or another
 473    compiler that supports C99.  */
 474 #if HAVE_DESIGNATED_INITIALIZERS
 475 extern const unsigned char _cpp_trigraph_map[UCHAR_MAX + 1];
 476 #else
 477 extern unsigned char _cpp_trigraph_map[UCHAR_MAX + 1];
 478 #endif
 479
 480 /* Macros.  */
 481
 482 static inline int cpp_in_system_header (cpp_reader *);
 483 static inline int
 484 cpp_in_system_header (cpp_reader *pfile)
 485 {
 486   return pfile->buffer ? pfile->buffer->sysp : 0;
 487 }
 488 #define CPP_PEDANTIC(PF) CPP_OPTION (PF, pedantic)
 489 #define CPP_WTRADITIONAL(PF) CPP_OPTION (PF, warn_traditional)
 490
 491 /* In errors.c  */
 492 extern int _cpp_begin_message (cpp_reader *, int,
 493                                source_location, unsigned int);
 494
 495 /* In macro.c */
 496 extern void _cpp_free_definition (cpp_hashnode *);
 497 extern bool _cpp_create_definition (cpp_reader *, cpp_hashnode *);
 498 extern void _cpp_pop_context (cpp_reader *);
 499 extern void _cpp_push_text_context (cpp_reader *, cpp_hashnode *,
 500                                     const unsigned char *, size_t);
 501 extern bool _cpp_save_parameter (cpp_reader *, cpp_macro *, cpp_hashnode *);
 502 extern bool _cpp_arguments_ok (cpp_reader *, cpp_macro *, const cpp_hashnode *,
 503                                unsigned int);
 504 extern const unsigned char *_cpp_builtin_macro_text (cpp_reader *,
 505                                                      cpp_hashnode *);
 506 extern int _cpp_warn_if_unused_macro (cpp_reader *, cpp_hashnode *, void *);
 507 extern void _cpp_push_token_context (cpp_reader *, cpp_hashnode *,
 508                                      const cpp_token *, unsigned int);
 509
 510 /* In identifiers.c */
 511 extern void _cpp_init_hashtable (cpp_reader *, hash_table *);
 512 extern void _cpp_destroy_hashtable (cpp_reader *);
 513
 514 /* In files.c */
 515 typedef struct _cpp_file _cpp_file;
 516 extern _cpp_file *_cpp_find_file (cpp_reader *, const char *, cpp_dir *,
 517                                   bool, int);
 518 extern bool _cpp_find_failed (_cpp_file *);
 519 extern void _cpp_mark_file_once_only (cpp_reader *, struct _cpp_file *);
 520 extern void _cpp_fake_include (cpp_reader *, const char *);
 521 extern bool _cpp_stack_file (cpp_reader *, _cpp_file*, bool);
 522 extern bool _cpp_stack_include (cpp_reader *, const char *, int,
 523                                 enum include_type);
 524 extern int _cpp_compare_file_date (cpp_reader *, const char *, int);
 525 extern void _cpp_report_missing_guards (cpp_reader *);
 526 extern void _cpp_init_files (cpp_reader *);
 527 extern void _cpp_cleanup_files (cpp_reader *);
 528 extern void _cpp_pop_file_buffer (cpp_reader *, struct _cpp_file *);
 529 extern bool _cpp_save_file_entries (cpp_reader *pfile, FILE *f);
 530 extern bool _cpp_read_file_entries (cpp_reader *, FILE *);
 531 extern struct stat *_cpp_get_file_stat (_cpp_file *);
 532
 533 /* In expr.c */
 534 extern bool _cpp_parse_expr (cpp_reader *);
 535 extern struct op *_cpp_expand_op_stack (cpp_reader *);
 536
 537 /* In lex.c */
 538 extern void _cpp_process_line_notes (cpp_reader *, int);
 539 extern void _cpp_clean_line (cpp_reader *);
 540 extern bool _cpp_get_fresh_line (cpp_reader *);
 541 extern bool _cpp_skip_block_comment (cpp_reader *);
 542 extern cpp_token *_cpp_temp_token (cpp_reader *);
 543 extern const cpp_token *_cpp_lex_token (cpp_reader *);
 544 extern cpp_token *_cpp_lex_direct (cpp_reader *);
 545 extern int _cpp_equiv_tokens (const cpp_token *, const cpp_token *);
 546 extern void _cpp_init_tokenrun (tokenrun *, unsigned int);
 547
 548 /* In init.c.  */
 549 extern void _cpp_maybe_push_include_file (cpp_reader *);
 550
 551 /* In directives.c */
 552 extern int _cpp_test_assertion (cpp_reader *, unsigned int *);
 553 extern int _cpp_handle_directive (cpp_reader *, int);
 554 extern void _cpp_define_builtin (cpp_reader *, const char *);
 555 extern char ** _cpp_save_pragma_names (cpp_reader *);
 556 extern void _cpp_restore_pragma_names (cpp_reader *, char **);
 557 extern void _cpp_do__Pragma (cpp_reader *);
 558 extern void _cpp_init_directives (cpp_reader *);
 559 extern void _cpp_init_internal_pragmas (cpp_reader *);
 560 extern void _cpp_do_file_change (cpp_reader *, enum lc_reason, const char *,
 561                                  unsigned int, unsigned int);
 562 extern void _cpp_pop_buffer (cpp_reader *);
 563
 564 /* In traditional.c.  */
 565 extern bool _cpp_scan_out_logical_line (cpp_reader *, cpp_macro *);
 566 extern bool _cpp_read_logical_line_trad (cpp_reader *);
 567 extern void _cpp_overlay_buffer (cpp_reader *pfile, const unsigned char *,
 568                                  size_t);
 569 extern void _cpp_remove_overlay (cpp_reader *);
 570 extern bool _cpp_create_trad_definition (cpp_reader *, cpp_macro *);
 571 extern bool _cpp_expansions_different_trad (const cpp_macro *,
 572                                             const cpp_macro *);
 573 extern unsigned char *_cpp_copy_replacement_text (const cpp_macro *,
 574                                                   unsigned char *);
 575 extern size_t _cpp_replacement_text_len (const cpp_macro *);
 576
 577 /* In charset.c.  */
 578
 579 /* The normalization state at this point in the sequence.
 580    It starts initialized to all zeros, and at the end
 581    'level' is the normalization level of the sequence.  */
 582
 583 struct normalize_state
 584 {
 585   /* The previous character.  */
 586   cppchar_t previous;
 587   /* The combining class of the previous character.  */
 588   unsigned char prev_class;
 589   /* The lowest normalization level so far.  */
 590   enum cpp_normalize_level level;
 591 };
 592 #define INITIAL_NORMALIZE_STATE { 0, 0, normalized_KC }
 593 #define NORMALIZE_STATE_RESULT(st) ((st)->level)
 594
 595 /* We saw a character that matches ISIDNUM(), update a
 596    normalize_state appropriately.  */
 597 #define NORMALIZE_STATE_UPDATE_IDNUM(st) \
 598   ((st)->previous = 0, (st)->prev_class = 0)
 599
 600 extern cppchar_t _cpp_valid_ucn (cpp_reader *, const unsigned char **,
 601                                  const unsigned char *, int,
 602                                  struct normalize_state *state);
 603 extern void _cpp_destroy_iconv (cpp_reader *);
 604 extern unsigned char *_cpp_convert_input (cpp_reader *, const char *,
 605                                           unsigned char *, size_t, size_t,
 606                                           off_t *);
 607 extern const char *_cpp_default_encoding (void);
 608 extern cpp_hashnode * _cpp_interpret_identifier (cpp_reader *pfile,
 609                                                  const unsigned char *id,
 610                                                  size_t len);
 611
 612 /* Utility routines and macros.  */
 613 #define DSC(str) (const unsigned char *)str, sizeof str - 1
 614
 615 /* These are inline functions instead of macros so we can get type
 616    checking.  */
 617 static inline int ustrcmp (const unsigned char *, const unsigned char *);
 618 static inline int ustrncmp (const unsigned char *, const unsigned char *,
 619                             size_t);
 620 static inline size_t ustrlen (const unsigned char *);
 621 static inline unsigned char *uxstrdup (const unsigned char *);
 622 static inline unsigned char *ustrchr (const unsigned char *, int);
 623 static inline int ufputs (const unsigned char *, FILE *);
 624
 625 /* Use a const char for the second parameter since it is usually a literal.  */
 626 static inline int ustrcspn (const unsigned char *, const char *);
 627
 628 static inline int
 629 ustrcmp (const unsigned char *s1, const unsigned char *s2)
 630 {
 631   return strcmp ((const char *)s1, (const char *)s2);
 632 }
 633
 634 static inline int
 635 ustrncmp (const unsigned char *s1, const unsigned char *s2, size_t n)
 636 {
 637   return strncmp ((const char *)s1, (const char *)s2, n);
 638 }
 639
 640 static inline int
 641 ustrcspn (const unsigned char *s1, const char *s2)
 642 {
 643   return strcspn ((const char *)s1, s2);
 644 }
 645
 646 static inline size_t
 647 ustrlen (const unsigned char *s1)
 648 {
 649   return strlen ((const char *)s1);
 650 }
 651
 652 static inline unsigned char *
 653 uxstrdup (const unsigned char *s1)
 654 {
 655   return (unsigned char *) xstrdup ((const char *)s1);
 656 }
 657
 658 static inline unsigned char *
 659 ustrchr (const unsigned char *s1, int c)
 660 {
 661   return (unsigned char *) strchr ((const char *)s1, c);
 662 }
 663
 664 static inline int
 665 ufputs (const unsigned char *s, FILE *f)
 666 {
 667   return fputs ((const char *)s, f);
 668 }
 669
 670 #endif /* ! LIBCPP_INTERNAL_H */