--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libcpp/internal.h	Fri Jul 17 14:47:48 2009 +0900
@@ -0,0 +1,711 @@
+/* Part of CPP library.
+   Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007,
+   2008, 2009 Free Software Foundation, Inc.
+
+This program is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 3, or (at your option) any
+later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+/* This header defines all the internal data structures and functions
+   that need to be visible across files.  It should not be used outside
+   cpplib.  */
+
+#ifndef LIBCPP_INTERNAL_H
+#define LIBCPP_INTERNAL_H
+
+#include "symtab.h"
+#include "cpp-id-data.h"
+
+#ifndef HAVE_ICONV_H
+#undef HAVE_ICONV
+#endif
+
+#if HAVE_ICONV
+#include <iconv.h>
+#else
+#define HAVE_ICONV 0
+typedef int iconv_t;  /* dummy */
+#endif
+
+struct directive;		/* Deliberately incomplete.  */
+struct pending_option;
+struct op;
+struct _cpp_strbuf;
+
+typedef bool (*convert_f) (iconv_t, const unsigned char *, size_t,
+			   struct _cpp_strbuf *);
+struct cset_converter
+{
+  convert_f func;
+  iconv_t cd;
+  int width;
+};
+
+#define BITS_PER_CPPCHAR_T (CHAR_BIT * sizeof (cppchar_t))
+
+/* Test if a sign is valid within a preprocessing number.  */
+#define VALID_SIGN(c, prevc) \
+  (((c) == '+' || (c) == '-') && \
+   ((prevc) == 'e' || (prevc) == 'E' \
+    || (((prevc) == 'p' || (prevc) == 'P') \
+        && CPP_OPTION (pfile, extended_numbers))))
+
+#define CPP_OPTION(PFILE, OPTION) ((PFILE)->opts.OPTION)
+#define CPP_BUFFER(PFILE) ((PFILE)->buffer)
+#define CPP_BUF_COLUMN(BUF, CUR) ((CUR) - (BUF)->line_base)
+#define CPP_BUF_COL(BUF) CPP_BUF_COLUMN(BUF, (BUF)->cur)
+
+#define CPP_INCREMENT_LINE(PFILE, COLS_HINT) do { \
+    const struct line_maps *line_table = PFILE->line_table; \
+    const struct line_map *map = &line_table->maps[line_table->used-1]; \
+    linenum_type line = SOURCE_LINE (map, line_table->highest_line); \
+    linemap_line_start (PFILE->line_table, line + 1, COLS_HINT); \
+  } while (0)
+
+/* Maximum nesting of cpp_buffers.  We use a static limit, partly for
+   efficiency, and partly to limit runaway recursion.  */
+#define CPP_STACK_MAX 200
+
+/* Host alignment handling.  */
+struct dummy
+{
+  char c;
+  union
+  {
+    double d;
+    int *p;
+  } u;
+};
+
+#define DEFAULT_ALIGNMENT offsetof (struct dummy, u)
+#define CPP_ALIGN2(size, align) (((size) + ((align) - 1)) & ~((align) - 1))
+#define CPP_ALIGN(size) CPP_ALIGN2 (size, DEFAULT_ALIGNMENT)
+
+#define _cpp_mark_macro_used(NODE) do {					\
+  if ((NODE)->type == NT_MACRO && !((NODE)->flags & NODE_BUILTIN))	\
+    (NODE)->value.macro->used = 1; } while (0)
+
+/* A generic memory buffer, and operations on it.  */
+typedef struct _cpp_buff _cpp_buff;
+struct _cpp_buff
+{
+  struct _cpp_buff *next;
+  unsigned char *base, *cur, *limit;
+};
+
+extern _cpp_buff *_cpp_get_buff (cpp_reader *, size_t);
+extern void _cpp_release_buff (cpp_reader *, _cpp_buff *);
+extern void _cpp_extend_buff (cpp_reader *, _cpp_buff **, size_t);
+extern _cpp_buff *_cpp_append_extend_buff (cpp_reader *, _cpp_buff *, size_t);
+extern void _cpp_free_buff (_cpp_buff *);
+extern unsigned char *_cpp_aligned_alloc (cpp_reader *, size_t);
+extern unsigned char *_cpp_unaligned_alloc (cpp_reader *, size_t);
+
+#define BUFF_ROOM(BUFF) (size_t) ((BUFF)->limit - (BUFF)->cur)
+#define BUFF_FRONT(BUFF) ((BUFF)->cur)
+#define BUFF_LIMIT(BUFF) ((BUFF)->limit)
+
+/* #include types.  */
+enum include_type {IT_INCLUDE, IT_INCLUDE_NEXT, IT_IMPORT, IT_CMDLINE};
+
+union utoken
+{
+  const cpp_token *token;
+  const cpp_token **ptoken;
+};
+
+/* A "run" of tokens; part of a chain of runs.  */
+typedef struct tokenrun tokenrun;
+struct tokenrun
+{
+  tokenrun *next, *prev;
+  cpp_token *base, *limit;
+};
+
+/* Accessor macros for struct cpp_context.  */
+#define FIRST(c) ((c)->u.iso.first)
+#define LAST(c) ((c)->u.iso.last)
+#define CUR(c) ((c)->u.trad.cur)
+#define RLIMIT(c) ((c)->u.trad.rlimit)
+
+typedef struct cpp_context cpp_context;
+struct cpp_context
+{
+  /* Doubly-linked list.  */
+  cpp_context *next, *prev;
+
+  union
+  {
+    /* For ISO macro expansion.  Contexts other than the base context
+       are contiguous tokens.  e.g. macro expansions, expanded
+       argument tokens.  */
+    struct
+    {
+      union utoken first;
+      union utoken last;
+    } iso;
+
+    /* For traditional macro expansion.  */
+    struct
+    {
+      const unsigned char *cur;
+      const unsigned char *rlimit;
+    } trad;
+  } u;
+
+  /* If non-NULL, a buffer used for storage related to this context.
+     When the context is popped, the buffer is released.  */
+  _cpp_buff *buff;
+
+  /* For a macro context, the macro node, otherwise NULL.  */
+  cpp_hashnode *macro;
+
+  /* True if utoken element is token, else ptoken.  */
+  bool direct_p;
+};
+
+struct lexer_state
+{
+  /* Nonzero if first token on line is CPP_HASH.  */
+  unsigned char in_directive;
+
+  /* Nonzero if in a directive that will handle padding tokens itself.
+     #include needs this to avoid problems with computed include and
+     spacing between tokens.  */
+  unsigned char directive_wants_padding;
+
+  /* True if we are skipping a failed conditional group.  */
+  unsigned char skipping;
+
+  /* Nonzero if in a directive that takes angle-bracketed headers.  */
+  unsigned char angled_headers;
+
+  /* Nonzero if in a #if or #elif directive.  */
+  unsigned char in_expression;
+
+  /* Nonzero to save comments.  Turned off if discard_comments, and in
+     all directives apart from #define.  */
+  unsigned char save_comments;
+
+  /* Nonzero if lexing __VA_ARGS__ is valid.  */
+  unsigned char va_args_ok;
+
+  /* Nonzero if lexing poisoned identifiers is valid.  */
+  unsigned char poisoned_ok;
+
+  /* Nonzero to prevent macro expansion.  */
+  unsigned char prevent_expansion;
+
+  /* Nonzero when parsing arguments to a function-like macro.  */
+  unsigned char parsing_args;
+
+  /* Nonzero if prevent_expansion is true only because output is
+     being discarded.  */
+  unsigned char discarding_output;
+
+  /* Nonzero to skip evaluating part of an expression.  */
+  unsigned int skip_eval;
+
+  /* Nonzero when handling a deferred pragma.  */
+  unsigned char in_deferred_pragma;
+
+  /* Nonzero if the deferred pragma being handled allows macro expansion.  */
+  unsigned char pragma_allow_expansion;
+};
+
+/* Special nodes - identifiers with predefined significance.  */
+struct spec_nodes
+{
+  cpp_hashnode *n_defined;		/* defined operator */
+  cpp_hashnode *n_true;			/* C++ keyword true */
+  cpp_hashnode *n_false;		/* C++ keyword false */
+  cpp_hashnode *n__VA_ARGS__;		/* C99 vararg macros */
+};
+
+typedef struct _cpp_line_note _cpp_line_note;
+struct _cpp_line_note
+{
+  /* Location in the clean line the note refers to.  */
+  const unsigned char *pos;
+
+  /* Type of note.  The 9 'from' trigraph characters represent those
+     trigraphs, '\\' an escaped newline, ' ' an escaped newline with
+     intervening space, and anything else is invalid.  */
+  unsigned int type;
+};
+
+/* Represents the contents of a file cpplib has read in.  */
+struct cpp_buffer
+{
+  const unsigned char *cur;        /* Current location.  */
+  const unsigned char *line_base;  /* Start of current physical line.  */
+  const unsigned char *next_line;  /* Start of to-be-cleaned logical line.  */
+
+  const unsigned char *buf;        /* Entire character buffer.  */
+  const unsigned char *rlimit;     /* Writable byte at end of file.  */
+
+  _cpp_line_note *notes;           /* Array of notes.  */
+  unsigned int cur_note;           /* Next note to process.  */
+  unsigned int notes_used;         /* Number of notes.  */
+  unsigned int notes_cap;          /* Size of allocated array.  */
+
+  struct cpp_buffer *prev;
+
+  /* Pointer into the file table; non-NULL if this is a file buffer.
+     Used for include_next and to record control macros.  */
+  struct _cpp_file *file;
+
+  /* Saved value of __TIMESTAMP__ macro - date and time of last modification
+     of the assotiated file.  */
+  const unsigned char *timestamp;
+
+  /* Value of if_stack at start of this file.
+     Used to prohibit unmatched #endif (etc) in an include file.  */
+  struct if_stack *if_stack;
+
+  /* True if we need to get the next clean line.  */
+  bool need_line;
+
+  /* True if we have already warned about C++ comments in this file.
+     The warning happens only for C89 extended mode with -pedantic on,
+     or for -Wtraditional, and only once per file (otherwise it would
+     be far too noisy).  */
+  unsigned int warned_cplusplus_comments : 1;
+
+  /* True if we don't process trigraphs and escaped newlines.  True
+     for preprocessed input, command line directives, and _Pragma
+     buffers.  */
+  unsigned int from_stage3 : 1;
+
+  /* At EOF, a buffer is automatically popped.  If RETURN_AT_EOF is
+     true, a CPP_EOF token is then returned.  Otherwise, the next
+     token from the enclosing buffer is returned.  */
+  unsigned int return_at_eof : 1;
+
+  /* One for a system header, two for a C system header file that therefore
+     needs to be extern "C" protected in C++, and zero otherwise.  */
+  unsigned char sysp;
+
+  /* The directory of the this buffer's file.  Its NAME member is not
+     allocated, so we don't need to worry about freeing it.  */
+  struct cpp_dir dir;
+
+  /* Descriptor for converting from the input character set to the
+     source character set.  */
+  struct cset_converter input_cset_desc;
+};
+
+/* A cpp_reader encapsulates the "state" of a pre-processor run.
+   Applying cpp_get_token repeatedly yields a stream of pre-processor
+   tokens.  Usually, there is only one cpp_reader object active.  */
+struct cpp_reader
+{
+  /* Top of buffer stack.  */
+  cpp_buffer *buffer;
+
+  /* Overlaid buffer (can be different after processing #include).  */
+  cpp_buffer *overlaid_buffer;
+
+  /* Lexer state.  */
+  struct lexer_state state;
+
+  /* Source line tracking.  */
+  struct line_maps *line_table;
+
+  /* The line of the '#' of the current directive.  */
+  source_location directive_line;
+
+  /* Memory buffers.  */
+  _cpp_buff *a_buff;		/* Aligned permanent storage.  */
+  _cpp_buff *u_buff;		/* Unaligned permanent storage.  */
+  _cpp_buff *free_buffs;	/* Free buffer chain.  */
+
+  /* Context stack.  */
+  struct cpp_context base_context;
+  struct cpp_context *context;
+
+  /* If in_directive, the directive if known.  */
+  const struct directive *directive;
+
+  /* Token generated while handling a directive, if any. */
+  cpp_token directive_result;
+
+  /* When expanding a macro at top-level, this is the location of the
+     macro invocation.  */
+  source_location invocation_location;
+
+  /* True if this call to cpp_get_token should consider setting
+     invocation_location.  */
+  bool set_invocation_location;
+
+  /* Search paths for include files.  */
+  struct cpp_dir *quote_include;	/* "" */
+  struct cpp_dir *bracket_include;	/* <> */
+  struct cpp_dir no_search_path;	/* No path.  */
+
+  /* Chain of all hashed _cpp_file instances.  */
+  struct _cpp_file *all_files;
+
+  struct _cpp_file *main_file;
+
+  /* File and directory hash table.  */
+  struct htab *file_hash;
+  struct htab *dir_hash;
+  struct file_hash_entry_pool *file_hash_entries;
+
+  /* Negative path lookup hash table.  */
+  struct htab *nonexistent_file_hash;
+  struct obstack nonexistent_file_ob;
+
+  /* Nonzero means don't look for #include "foo" the source-file
+     directory.  */
+  bool quote_ignores_source_dir;
+
+  /* Nonzero if any file has contained #pragma once or #import has
+     been used.  */
+  bool seen_once_only;
+
+  /* Multiple include optimization.  */
+  const cpp_hashnode *mi_cmacro;
+  const cpp_hashnode *mi_ind_cmacro;
+  bool mi_valid;
+
+  /* Lexing.  */
+  cpp_token *cur_token;
+  tokenrun base_run, *cur_run;
+  unsigned int lookaheads;
+
+  /* Nonzero prevents the lexer from re-using the token runs.  */
+  unsigned int keep_tokens;
+
+  /* Error counter for exit code.  */
+  unsigned int errors;
+
+  /* Buffer to hold macro definition string.  */
+  unsigned char *macro_buffer;
+  unsigned int macro_buffer_len;
+
+  /* Descriptor for converting from the source character set to the
+     execution character set.  */
+  struct cset_converter narrow_cset_desc;
+
+  /* Descriptor for converting from the source character set to the
+     UTF-16 execution character set.  */
+  struct cset_converter char16_cset_desc;
+
+  /* Descriptor for converting from the source character set to the
+     UTF-32 execution character set.  */
+  struct cset_converter char32_cset_desc;
+
+  /* Descriptor for converting from the source character set to the
+     wide execution character set.  */
+  struct cset_converter wide_cset_desc;
+
+  /* Date and time text.  Calculated together if either is requested.  */
+  const unsigned char *date;
+  const unsigned char *time;
+
+  /* EOF token, and a token forcing paste avoidance.  */
+  cpp_token avoid_paste;
+  cpp_token eof;
+
+  /* Opaque handle to the dependencies of mkdeps.c.  */
+  struct deps *deps;
+
+  /* Obstack holding all macro hash nodes.  This never shrinks.
+     See identifiers.c */
+  struct obstack hash_ob;
+
+  /* Obstack holding buffer and conditional structures.  This is a
+     real stack.  See directives.c.  */
+  struct obstack buffer_ob;
+
+  /* Pragma table - dynamic, because a library user can add to the
+     list of recognized pragmas.  */
+  struct pragma_entry *pragmas;
+
+  /* Call backs to cpplib client.  */
+  struct cpp_callbacks cb;
+
+  /* Identifier hash table.  */
+  struct ht *hash_table;
+
+  /* Expression parser stack.  */
+  struct op *op_stack, *op_limit;
+
+  /* User visible options.  */
+  struct cpp_options opts;
+
+  /* Special nodes - identifiers with predefined significance to the
+     preprocessor.  */
+  struct spec_nodes spec_nodes;
+
+  /* Whether cpplib owns the hashtable.  */
+  bool our_hashtable;
+
+  /* Traditional preprocessing output buffer (a logical line).  */
+  struct
+  {
+    unsigned char *base;
+    unsigned char *limit;
+    unsigned char *cur;
+    source_location first_line;
+  } out;
+
+  /* Used for buffer overlays by traditional.c.  */
+  const unsigned char *saved_cur, *saved_rlimit, *saved_line_base;
+
+  /* A saved list of the defined macros, for dependency checking
+     of precompiled headers.  */
+  struct cpp_savedstate *savedstate;
+
+  /* Next value of __COUNTER__ macro. */
+  unsigned int counter;
+
+  /* Table of comments, when state.save_comments is true.  */
+  cpp_comment_table comments;
+};
+
+/* Character classes.  Based on the more primitive macros in safe-ctype.h.
+   If the definition of `numchar' looks odd to you, please look up the
+   definition of a pp-number in the C standard [section 6.4.8 of C99].
+
+   In the unlikely event that characters other than \r and \n enter
+   the set is_vspace, the macro handle_newline() in lex.c must be
+   updated.  */
+#define _dollar_ok(x)	((x) == '$' && CPP_OPTION (pfile, dollars_in_ident))
+
+#define is_idchar(x)	(ISIDNUM(x) || _dollar_ok(x))
+#define is_numchar(x)	ISIDNUM(x)
+#define is_idstart(x)	(ISIDST(x) || _dollar_ok(x))
+#define is_numstart(x)	ISDIGIT(x)
+#define is_hspace(x)	ISBLANK(x)
+#define is_vspace(x)	IS_VSPACE(x)
+#define is_nvspace(x)	IS_NVSPACE(x)
+#define is_space(x)	IS_SPACE_OR_NUL(x)
+
+/* This table is constant if it can be initialized at compile time,
+   which is the case if cpp was compiled with GCC >=2.7, or another
+   compiler that supports C99.  */
+#if HAVE_DESIGNATED_INITIALIZERS
+extern const unsigned char _cpp_trigraph_map[UCHAR_MAX + 1];
+#else
+extern unsigned char _cpp_trigraph_map[UCHAR_MAX + 1];
+#endif
+
+/* Macros.  */
+
+static inline int cpp_in_system_header (cpp_reader *);
+static inline int
+cpp_in_system_header (cpp_reader *pfile)
+{
+  return pfile->buffer ? pfile->buffer->sysp : 0;
+}
+#define CPP_PEDANTIC(PF) CPP_OPTION (PF, pedantic)
+#define CPP_WTRADITIONAL(PF) CPP_OPTION (PF, warn_traditional)
+
+static inline int cpp_in_primary_file (cpp_reader *);
+static inline int
+cpp_in_primary_file (cpp_reader *pfile)
+{
+  return pfile->line_table->depth == 1;
+}
+
+/* In macro.c */
+extern void _cpp_free_definition (cpp_hashnode *);
+extern bool _cpp_create_definition (cpp_reader *, cpp_hashnode *);
+extern void _cpp_pop_context (cpp_reader *);
+extern void _cpp_push_text_context (cpp_reader *, cpp_hashnode *,
+				    const unsigned char *, size_t);
+extern bool _cpp_save_parameter (cpp_reader *, cpp_macro *, cpp_hashnode *);
+extern bool _cpp_arguments_ok (cpp_reader *, cpp_macro *, const cpp_hashnode *,
+			       unsigned int);
+extern const unsigned char *_cpp_builtin_macro_text (cpp_reader *,
+						     cpp_hashnode *);
+extern int _cpp_warn_if_unused_macro (cpp_reader *, cpp_hashnode *, void *);
+extern void _cpp_push_token_context (cpp_reader *, cpp_hashnode *,
+				     const cpp_token *, unsigned int);
+extern void _cpp_backup_tokens_direct (cpp_reader *, unsigned int);
+
+/* In identifiers.c */
+extern void _cpp_init_hashtable (cpp_reader *, hash_table *);
+extern void _cpp_destroy_hashtable (cpp_reader *);
+
+/* In files.c */
+typedef struct _cpp_file _cpp_file;
+extern _cpp_file *_cpp_find_file (cpp_reader *, const char *, cpp_dir *,
+				  bool, int);
+extern bool _cpp_find_failed (_cpp_file *);
+extern void _cpp_mark_file_once_only (cpp_reader *, struct _cpp_file *);
+extern void _cpp_fake_include (cpp_reader *, const char *);
+extern bool _cpp_stack_file (cpp_reader *, _cpp_file*, bool);
+extern bool _cpp_stack_include (cpp_reader *, const char *, int,
+				enum include_type);
+extern int _cpp_compare_file_date (cpp_reader *, const char *, int);
+extern void _cpp_report_missing_guards (cpp_reader *);
+extern void _cpp_init_files (cpp_reader *);
+extern void _cpp_cleanup_files (cpp_reader *);
+extern void _cpp_pop_file_buffer (cpp_reader *, struct _cpp_file *);
+extern bool _cpp_save_file_entries (cpp_reader *pfile, FILE *f);
+extern bool _cpp_read_file_entries (cpp_reader *, FILE *);
+extern struct stat *_cpp_get_file_stat (_cpp_file *);
+
+/* In expr.c */
+extern bool _cpp_parse_expr (cpp_reader *, bool);
+extern struct op *_cpp_expand_op_stack (cpp_reader *);
+
+/* In lex.c */
+extern void _cpp_process_line_notes (cpp_reader *, int);
+extern void _cpp_clean_line (cpp_reader *);
+extern bool _cpp_get_fresh_line (cpp_reader *);
+extern bool _cpp_skip_block_comment (cpp_reader *);
+extern cpp_token *_cpp_temp_token (cpp_reader *);
+extern const cpp_token *_cpp_lex_token (cpp_reader *);
+extern cpp_token *_cpp_lex_direct (cpp_reader *);
+extern int _cpp_equiv_tokens (const cpp_token *, const cpp_token *);
+extern void _cpp_init_tokenrun (tokenrun *, unsigned int);
+
+/* In init.c.  */
+extern void _cpp_maybe_push_include_file (cpp_reader *);
+
+/* In directives.c */
+extern int _cpp_test_assertion (cpp_reader *, unsigned int *);
+extern int _cpp_handle_directive (cpp_reader *, int);
+extern void _cpp_define_builtin (cpp_reader *, const char *);
+extern char ** _cpp_save_pragma_names (cpp_reader *);
+extern void _cpp_restore_pragma_names (cpp_reader *, char **);
+extern int _cpp_do__Pragma (cpp_reader *);
+extern void _cpp_init_directives (cpp_reader *);
+extern void _cpp_init_internal_pragmas (cpp_reader *);
+extern void _cpp_do_file_change (cpp_reader *, enum lc_reason, const char *,
+				 linenum_type, unsigned int);
+extern void _cpp_pop_buffer (cpp_reader *);
+
+/* In directives.c */
+struct _cpp_dir_only_callbacks
+{
+  /* Called to print a block of lines. */
+  void (*print_lines) (int, const void *, size_t);
+  void (*maybe_print_line) (source_location);
+};
+
+extern void _cpp_preprocess_dir_only (cpp_reader *,
+				      const struct _cpp_dir_only_callbacks *);
+
+/* In traditional.c.  */
+extern bool _cpp_scan_out_logical_line (cpp_reader *, cpp_macro *);
+extern bool _cpp_read_logical_line_trad (cpp_reader *);
+extern void _cpp_overlay_buffer (cpp_reader *pfile, const unsigned char *,
+				 size_t);
+extern void _cpp_remove_overlay (cpp_reader *);
+extern bool _cpp_create_trad_definition (cpp_reader *, cpp_macro *);
+extern bool _cpp_expansions_different_trad (const cpp_macro *,
+					    const cpp_macro *);
+extern unsigned char *_cpp_copy_replacement_text (const cpp_macro *,
+						  unsigned char *);
+extern size_t _cpp_replacement_text_len (const cpp_macro *);
+
+/* In charset.c.  */
+
+/* The normalization state at this point in the sequence.
+   It starts initialized to all zeros, and at the end
+   'level' is the normalization level of the sequence.  */
+
+struct normalize_state 
+{
+  /* The previous character.  */
+  cppchar_t previous;
+  /* The combining class of the previous character.  */
+  unsigned char prev_class;
+  /* The lowest normalization level so far.  */
+  enum cpp_normalize_level level;
+};
+#define INITIAL_NORMALIZE_STATE { 0, 0, normalized_KC }
+#define NORMALIZE_STATE_RESULT(st) ((st)->level)
+
+/* We saw a character that matches ISIDNUM(), update a
+   normalize_state appropriately.  */
+#define NORMALIZE_STATE_UPDATE_IDNUM(st) \
+  ((st)->previous = 0, (st)->prev_class = 0)
+
+extern cppchar_t _cpp_valid_ucn (cpp_reader *, const unsigned char **,
+				 const unsigned char *, int,
+				 struct normalize_state *state);
+extern void _cpp_destroy_iconv (cpp_reader *);
+extern unsigned char *_cpp_convert_input (cpp_reader *, const char *,
+					  unsigned char *, size_t, size_t,
+					  const unsigned char **, off_t *);
+extern const char *_cpp_default_encoding (void);
+extern cpp_hashnode * _cpp_interpret_identifier (cpp_reader *pfile,
+						 const unsigned char *id,
+						 size_t len);
+
+/* Utility routines and macros.  */
+#define DSC(str) (const unsigned char *)str, sizeof str - 1
+
+/* These are inline functions instead of macros so we can get type
+   checking.  */
+static inline int ustrcmp (const unsigned char *, const unsigned char *);
+static inline int ustrncmp (const unsigned char *, const unsigned char *,
+			    size_t);
+static inline size_t ustrlen (const unsigned char *);
+static inline unsigned char *uxstrdup (const unsigned char *);
+static inline unsigned char *ustrchr (const unsigned char *, int);
+static inline int ufputs (const unsigned char *, FILE *);
+
+/* Use a const char for the second parameter since it is usually a literal.  */
+static inline int ustrcspn (const unsigned char *, const char *);
+
+static inline int
+ustrcmp (const unsigned char *s1, const unsigned char *s2)
+{
+  return strcmp ((const char *)s1, (const char *)s2);
+}
+
+static inline int
+ustrncmp (const unsigned char *s1, const unsigned char *s2, size_t n)
+{
+  return strncmp ((const char *)s1, (const char *)s2, n);
+}
+
+static inline int
+ustrcspn (const unsigned char *s1, const char *s2)
+{
+  return strcspn ((const char *)s1, s2);
+}
+
+static inline size_t
+ustrlen (const unsigned char *s1)
+{
+  return strlen ((const char *)s1);
+}
+
+static inline unsigned char *
+uxstrdup (const unsigned char *s1)
+{
+  return (unsigned char *) xstrdup ((const char *)s1);
+}
+
+static inline unsigned char *
+ustrchr (const unsigned char *s1, int c)
+{
+  return (unsigned char *) strchr ((const char *)s1, c);
+}
+
+static inline int
+ufputs (const unsigned char *s, FILE *f)
+{
+  return fputs ((const char *)s, f);
+}
+
+#endif /* ! LIBCPP_INTERNAL_H */