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/* CPP Library - lexical analysis.
   Copyright (C) 2000 Free Software Foundation, Inc.
   Contributed by Per Bothner, 1994-95.
   Based on CCCP program by Paul Rubin, June 1986
   Adapted to ANSI C, Richard Stallman, Jan 1987
   Broken out to separate file, Zack Weinberg, Mar 2000

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 2, 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; if not, write to the Free Software
Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#include "config.h"
#include "system.h"
#include "intl.h"
#include "cpplib.h"
#include "cpphash.h"

#define PEEKN(N) (CPP_BUFFER (pfile)->rlimit - CPP_BUFFER (pfile)->cur >= (N) \
		  ? CPP_BUFFER (pfile)->cur[N] : EOF)
#define FORWARD(N) CPP_FORWARD (CPP_BUFFER (pfile), (N))
#define GETC() CPP_BUF_GET (CPP_BUFFER (pfile))
#define PEEKC() CPP_BUF_PEEK (CPP_BUFFER (pfile))

static void skip_block_comment	PARAMS ((cpp_reader *));
static void skip_line_comment	PARAMS ((cpp_reader *));
static int maybe_macroexpand	PARAMS ((cpp_reader *, long));
static int skip_comment		PARAMS ((cpp_reader *, int));
static int copy_comment		PARAMS ((cpp_reader *, int));
static void skip_string		PARAMS ((cpp_reader *, int));
static void parse_string	PARAMS ((cpp_reader *, int));
static U_CHAR *find_position	PARAMS ((U_CHAR *, U_CHAR *, unsigned long *));
static int null_cleanup		PARAMS ((cpp_buffer *, cpp_reader *));

/* Re-allocates PFILE->token_buffer so it will hold at least N more chars.  */

void
_cpp_grow_token_buffer (pfile, n)
     cpp_reader *pfile;
     long n;
{
  long old_written = CPP_WRITTEN (pfile);
  pfile->token_buffer_size = n + 2 * pfile->token_buffer_size;
  pfile->token_buffer = (U_CHAR *)
    xrealloc(pfile->token_buffer, pfile->token_buffer_size);
  CPP_SET_WRITTEN (pfile, old_written);
}

static int
null_cleanup (pbuf, pfile)
     cpp_buffer *pbuf ATTRIBUTE_UNUSED;
     cpp_reader *pfile ATTRIBUTE_UNUSED;
{
  return 0;
}

/* Allocate a new cpp_buffer for PFILE, and push it on the input buffer stack.
   If BUFFER != NULL, then use the LENGTH characters in BUFFER
   as the new input buffer.
   Return the new buffer, or NULL on failure.  */

cpp_buffer *
cpp_push_buffer (pfile, buffer, length)
     cpp_reader *pfile;
     const U_CHAR *buffer;
     long length;
{
  cpp_buffer *buf = CPP_BUFFER (pfile);
  cpp_buffer *new;
  if (++pfile->buffer_stack_depth == CPP_STACK_MAX)
    {
      cpp_fatal (pfile, "macro or `#include' recursion too deep");
      return NULL;
    }

  new = (cpp_buffer *) xcalloc (1, sizeof (cpp_buffer));

  new->if_stack = pfile->if_stack;
  new->cleanup = null_cleanup;
  new->buf = new->cur = buffer;
  new->alimit = new->rlimit = buffer + length;
  new->prev = buf;
  new->mark = -1;
  new->line_base = NULL;

  CPP_BUFFER (pfile) = new;
  return new;
}

cpp_buffer *
cpp_pop_buffer (pfile)
     cpp_reader *pfile;
{
  cpp_buffer *buf = CPP_BUFFER (pfile);
  if (ACTIVE_MARK_P (pfile))
    cpp_ice (pfile, "mark active in cpp_pop_buffer");
  (*buf->cleanup) (buf, pfile);
  CPP_BUFFER (pfile) = CPP_PREV_BUFFER (buf);
  free (buf);
  pfile->buffer_stack_depth--;
  return CPP_BUFFER (pfile);
}

/* Scan until CPP_BUFFER (PFILE) is exhausted into PFILE->token_buffer.
   Pop the buffer when done.  */

void
cpp_scan_buffer (pfile)
     cpp_reader *pfile;
{
  cpp_buffer *buffer = CPP_BUFFER (pfile);
  enum cpp_token token;
  if (CPP_OPTION (pfile, no_output))
    {
      long old_written = CPP_WRITTEN (pfile);
      /* In no-output mode, we can ignore everything but directives.  */
      for (;;)
	{
	  if (! pfile->only_seen_white)
	    _cpp_skip_rest_of_line (pfile);
	  token = cpp_get_token (pfile);
	  if (token == CPP_EOF) /* Should not happen ...  */
	    break;
	  if (token == CPP_POP && CPP_BUFFER (pfile) == buffer)
	    {
	      if (CPP_PREV_BUFFER (CPP_BUFFER (pfile)) != NULL)
		cpp_pop_buffer (pfile);
	      break;
	    }
	}
      CPP_SET_WRITTEN (pfile, old_written);
    }
  else
    {
      for (;;)
	{
	  token = cpp_get_token (pfile);
	  if (token == CPP_EOF) /* Should not happen ...  */
	    break;
	  if (token == CPP_POP && CPP_BUFFER (pfile) == buffer)
	    {
	      if (CPP_PREV_BUFFER (CPP_BUFFER (pfile)) != NULL)
		cpp_pop_buffer (pfile);
	      break;
	    }
	}
    }
}

/*
 * Rescan a string (which may have escape marks) into pfile's buffer.
 * Place the result in pfile->token_buffer.
 *
 * The input is copied before it is scanned, so it is safe to pass
 * it something from the token_buffer that will get overwritten
 * (because it follows CPP_WRITTEN).  This is used by do_include.
 */

void
cpp_expand_to_buffer (pfile, buf, length)
     cpp_reader *pfile;
     const U_CHAR *buf;
     int length;
{
  register cpp_buffer *ip;
  U_CHAR *buf1;
  int save_no_output;

  if (length < 0)
    {
      cpp_ice (pfile, "length < 0 in cpp_expand_to_buffer");
      return;
    }

  /* Set up the input on the input stack.  */

  buf1 = (U_CHAR *) alloca (length + 1);
  memcpy (buf1, buf, length);
  buf1[length] = 0;

  ip = cpp_push_buffer (pfile, buf1, length);
  if (ip == NULL)
    return;
  ip->has_escapes = 1;

  /* Scan the input, create the output.  */
  save_no_output = CPP_OPTION (pfile, no_output);
  CPP_OPTION (pfile, no_output) = 0;
  CPP_OPTION (pfile, no_line_commands)++;
  cpp_scan_buffer (pfile);
  CPP_OPTION (pfile, no_line_commands)--;
  CPP_OPTION (pfile, no_output) = save_no_output;

  CPP_NUL_TERMINATE (pfile);
}

void
cpp_buf_line_and_col (pbuf, linep, colp)
     register cpp_buffer *pbuf;
     long *linep, *colp;
{
  if (pbuf)
    {
      *linep = pbuf->lineno;
      if (colp)
	*colp = pbuf->cur - pbuf->line_base;
    }
  else
    {
      *linep = 0;
      if (colp)
	*colp = 0;
    }
}

/* Return the topmost cpp_buffer that corresponds to a file (not a macro).  */

cpp_buffer *
cpp_file_buffer (pfile)
     cpp_reader *pfile;
{
  cpp_buffer *ip;

  for (ip = CPP_BUFFER (pfile); ip; ip = CPP_PREV_BUFFER (ip))
    if (ip->ihash != NULL)
      return ip;
  return NULL;
}

/* Skip a C-style block comment.  We know it's a comment, and point is
   at the second character of the starter.  */
static void
skip_block_comment (pfile)
     cpp_reader *pfile;
{
  int c, prev_c = -1;
  long line, col;

  FORWARD(1);
  cpp_buf_line_and_col (CPP_BUFFER (pfile), &line, &col);
  for (;;)
    {
      c = GETC ();
      if (c == EOF)
	{
	  cpp_error_with_line (pfile, line, col, "unterminated comment");
	  return;
	}
      else if (c == '\n' || c == '\r')
	{
	  /* \r cannot be a macro escape marker here. */
	  if (!ACTIVE_MARK_P (pfile))
	    CPP_BUMP_LINE (pfile);
	}
      else if (c == '/' && prev_c == '*')
	return;
      else if (c == '*' && prev_c == '/'
	       && CPP_OPTION (pfile, warn_comments))
	cpp_warning (pfile, "`/*' within comment");

      prev_c = c;
    }
}

/* Skip a C++/Chill line comment.  We know it's a comment, and point
   is at the second character of the initiator.  */
static void
skip_line_comment (pfile)
     cpp_reader *pfile;
{
  FORWARD(1);
  for (;;)
    {
      int c = GETC ();

      /* We don't have to worry about EOF in here.  */
      if (c == '\n')
	{
	  /* Don't consider final '\n' to be part of comment.  */
	  FORWARD(-1);
	  return;
	}
      else if (c == '\r')
	{
	  /* \r cannot be a macro escape marker here. */
	  if (!ACTIVE_MARK_P (pfile))
	    CPP_BUMP_LINE (pfile);
	  if (CPP_OPTION (pfile, warn_comments))
	    cpp_warning (pfile, "backslash-newline within line comment");
	}
    }
}

/* Skip a comment - C, C++, or Chill style.  M is the first character
   of the comment marker.  If this really is a comment, skip to its
   end and return ' '.  If this is not a comment, return M (which will
   be '/' or '-').  */

static int
skip_comment (pfile, m)
     cpp_reader *pfile;
     int m;
{
  if (m == '/' && PEEKC() == '*')
    {
      skip_block_comment (pfile);
      return ' ';
    }
  else if (m == '/' && PEEKC() == '/')
    {
      if (CPP_BUFFER (pfile)->system_header_p)
	{
	  /* We silently allow C++ comments in system headers, irrespective
	     of conformance mode, because lots of busted systems do that
	     and trying to clean it up in fixincludes is a nightmare.  */
	  skip_line_comment (pfile);
	  return ' ';
	}
      else if (CPP_OPTION (pfile, cplusplus_comments))
	{
	  if (CPP_OPTION (pfile, c89)
	      && CPP_PEDANTIC (pfile)
	      && ! CPP_BUFFER (pfile)->warned_cplusplus_comments)
	    {
	      cpp_pedwarn (pfile,
			   "C++ style comments are not allowed in ISO C89");
	      cpp_pedwarn (pfile,
			   "(this will be reported only once per input file)");
	      CPP_BUFFER (pfile)->warned_cplusplus_comments = 1;
	    }
	  skip_line_comment (pfile);
	  return ' ';
	}
      else
	return m;
    }
  else if (m == '-' && PEEKC() == '-'
	   && CPP_OPTION (pfile, chill))
    {
      skip_line_comment (pfile);
      return ' ';
    }
  else
    return m;
}

/* Identical to skip_comment except that it copies the comment into the
   token_buffer.  This is used if !discard_comments.  */
static int
copy_comment (pfile, m)
     cpp_reader *pfile;
     int m;
{
  const U_CHAR *start = CPP_BUFFER (pfile)->cur;  /* XXX Layering violation */
  const U_CHAR *limit;

  if (skip_comment (pfile, m) == m)
    return m;

  limit = CPP_BUFFER (pfile)->cur;
  CPP_RESERVE (pfile, limit - start + 2);
  CPP_PUTC_Q (pfile, m);
  for (; start <= limit; start++)
    if (*start != '\r')
      CPP_PUTC_Q (pfile, *start);

  return ' ';
}

/* Skip whitespace \-newline and comments.  Does not macro-expand.  */

void
_cpp_skip_hspace (pfile)
     cpp_reader *pfile;
{
  int c;
  while (1)
    {
      c = GETC();
      if (c == EOF)
	return;
      else if (is_hspace(c))
	{
	  if ((c == '\f' || c == '\v') && CPP_PEDANTIC (pfile))
	    cpp_pedwarn (pfile, "%s in preprocessing directive",
			 c == '\f' ? "formfeed" : "vertical tab");
	}
      else if (c == '\r')
	{
	  /* \r is a backslash-newline marker if !has_escapes, and
	     a deletable-whitespace or no-reexpansion marker otherwise. */
	  if (CPP_BUFFER (pfile)->has_escapes)
	    {
	      if (PEEKC() == ' ')
		FORWARD(1);
	      else
		break;
	    }
	  else
	    CPP_BUMP_LINE (pfile);
	}
      else if (c == '/' || c == '-')
	{
	  c = skip_comment (pfile, c);
	  if (c  != ' ')
	    break;
	}
      else
	break;
    }
  FORWARD(-1);
}

/* Read and discard the rest of the current line.  */

void
_cpp_skip_rest_of_line (pfile)
     cpp_reader *pfile;
{
  for (;;)
    {
      int c = GETC();
      switch (c)
	{
	case '\n':
	  FORWARD(-1);
	case EOF:
	  return;

	case '\r':
	  if (! CPP_BUFFER (pfile)->has_escapes)
	    CPP_BUMP_LINE (pfile);
	  break;
	  
	case '\'':
	case '\"':
	  skip_string (pfile, c);
	  break;

	case '/':
	case '-':
	  skip_comment (pfile, c);
	  break;

	case '\f':
	case '\v':
	  if (CPP_PEDANTIC (pfile))
	    cpp_pedwarn (pfile, "%s in preprocessing directive",
			 c == '\f' ? "formfeed" : "vertical tab");
	  break;

	}
    }
}

/* Parse an identifier starting with C.  */

void
_cpp_parse_name (pfile, c)
     cpp_reader *pfile;
     int c;
{
  for (;;)
  {
      if (! is_idchar(c))
      {
	  FORWARD (-1);
	  break;
      }

      if (c == '$' && CPP_PEDANTIC (pfile))
	cpp_pedwarn (pfile, "`$' in identifier");

      CPP_RESERVE(pfile, 2); /* One more for final NUL.  */
      CPP_PUTC_Q (pfile, c);
      c = GETC();
      if (c == EOF)
	break;
  }
  CPP_NUL_TERMINATE_Q (pfile);
  return;
}

/* Parse and skip over a string starting with C.  A single quoted
   string is treated like a double -- some programs (e.g., troff) are
   perverse this way.  (However, a single quoted string is not allowed
   to extend over multiple lines.)  */
static void
skip_string (pfile, c)
     cpp_reader *pfile;
     int c;
{
  long start_line, start_column;
  cpp_buf_line_and_col (cpp_file_buffer (pfile), &start_line, &start_column);

  while (1)
    {
      int cc = GETC();
      switch (cc)
	{
	case EOF:
	  cpp_error_with_line (pfile, start_line, start_column,
			       "unterminated string or character constant");
	  if (pfile->multiline_string_line != start_line
	      && pfile->multiline_string_line != 0)
	    cpp_error_with_line (pfile,
				 pfile->multiline_string_line, -1,
			 "possible real start of unterminated constant");
	  pfile->multiline_string_line = 0;
	  return;

	case '\n':
	  CPP_BUMP_LINE (pfile);
	  /* In Fortran and assembly language, silently terminate
	     strings of either variety at end of line.  This is a
	     kludge around not knowing where comments are in these
	     languages.  */
	  if (CPP_OPTION (pfile, lang_fortran)
	      || CPP_OPTION (pfile, lang_asm))
	    {
	      FORWARD(-1);
	      return;
	    }
	  /* Character constants may not extend over multiple lines.
	     In Standard C, neither may strings.  We accept multiline
	     strings as an extension.  */
	  if (c == '\'')
	    {
	      cpp_error_with_line (pfile, start_line, start_column,
				   "unterminated character constant");
	      FORWARD(-1);
	      return;
	    }
	  if (CPP_PEDANTIC (pfile) && pfile->multiline_string_line == 0)
	    cpp_pedwarn_with_line (pfile, start_line, start_column,
				   "string constant runs past end of line");
	  if (pfile->multiline_string_line == 0)
	    pfile->multiline_string_line = start_line;
	  break;

	case '\r':
	  if (CPP_BUFFER (pfile)->has_escapes)
	    {
	      cpp_ice (pfile, "\\r escape inside string constant");
	      FORWARD(1);
	    }
	  else
	    /* Backslash newline is replaced by nothing at all.  */
	    CPP_BUMP_LINE (pfile);
	  break;

	case '\\':
	  FORWARD(1);
	  break;

	case '\"':
	case '\'':
	  if (cc == c)
	    return;
	  break;
	}
    }
}

/* Parse a string and copy it to the output.  */

static void
parse_string (pfile, c)
     cpp_reader *pfile;
     int c;
{
  const U_CHAR *start = CPP_BUFFER (pfile)->cur;  /* XXX Layering violation */
  const U_CHAR *limit;

  skip_string (pfile, c);

  limit = CPP_BUFFER (pfile)->cur;
  CPP_RESERVE (pfile, limit - start + 2);
  CPP_PUTC_Q (pfile, c);
  for (; start < limit; start++)
    if (*start != '\r')
      CPP_PUTC_Q (pfile, *start);
}

/* Read an assertion into the token buffer, converting to
   canonical form: `#predicate(a n swe r)'  The next non-whitespace
   character to read should be the first letter of the predicate.
   Returns 0 for syntax error, 1 for bare predicate, 2 for predicate
   with answer (see callers for why). In case of 0, an error has been
   printed. */
int
_cpp_parse_assertion (pfile)
     cpp_reader *pfile;
{
  int c, dropwhite;
  _cpp_skip_hspace (pfile);
  c = PEEKC();
  if (c == '\n')
    {
      cpp_error (pfile, "assertion without predicate");
      return 0;
    }
  else if (! is_idstart(c))
    {
      cpp_error (pfile, "assertion predicate is not an identifier");
      return 0;
    }
  CPP_PUTC(pfile, '#');
  FORWARD(1);
  _cpp_parse_name (pfile, c);

  c = PEEKC();
  if (c != '(')
    {
      if (is_hspace(c) || c == '\r')
	_cpp_skip_hspace (pfile);
      c = PEEKC();
    }
  if (c != '(')
    return 1;

  CPP_PUTC(pfile, '(');
  FORWARD(1);
  dropwhite = 1;
  while ((c = GETC()) != ')')
    {
      if (is_space(c))
	{
	  if (! dropwhite)
	    {
	      CPP_PUTC(pfile, ' ');
	      dropwhite = 1;
	    }
	}
      else if (c == '\n' || c == EOF)
	{
	  if (c == '\n') FORWARD(-1);
	  cpp_error (pfile, "un-terminated assertion answer");
	  return 0;
	}
      else if (c == '\r')
	/* \r cannot be a macro escape here. */
	CPP_BUMP_LINE (pfile);
      else
	{
	  CPP_PUTC (pfile, c);
	  dropwhite = 0;
	}
    }

  if (pfile->limit[-1] == ' ')
    pfile->limit[-1] = ')';
  else if (pfile->limit[-1] == '(')
    {
      cpp_error (pfile, "empty token sequence in assertion");
      return 0;
    }
  else
    CPP_PUTC (pfile, ')');

  CPP_NUL_TERMINATE (pfile);
  return 2;
}

/* Get the next token, and add it to the text in pfile->token_buffer.
   Return the kind of token we got.  */

enum cpp_token
_cpp_lex_token (pfile)
     cpp_reader *pfile;
{
  register int c, c2, c3;
  enum cpp_token token;

 get_next:
  c = GETC();
  switch (c)
    {
    case EOF:
      return CPP_EOF;

    case '/':
      if (PEEKC () == '=')
	goto op2;

    comment:
      if (CPP_OPTION (pfile, discard_comments))
	c = skip_comment (pfile, c);
      else
	c = copy_comment (pfile, c);
      if (c != ' ')
	goto randomchar;
	  
      /* Comments are equivalent to spaces.
	 For -traditional, a comment is equivalent to nothing.  */
      if (CPP_TRADITIONAL (pfile) || !CPP_OPTION (pfile, discard_comments))
	return CPP_COMMENT;
      else
	{
	  CPP_PUTC (pfile, c);
	  return CPP_HSPACE;
	}

    case '#':
      if (pfile->parsing_if_directive)
	{
	  _cpp_skip_hspace (pfile);
	  if (_cpp_parse_assertion (pfile))
	    return CPP_ASSERTION;
	  goto randomchar;
	}

      if (pfile->parsing_define_directive && ! CPP_TRADITIONAL (pfile))
	{
	  CPP_RESERVE (pfile, 3);
	  CPP_PUTC_Q (pfile, '#');
	  CPP_NUL_TERMINATE_Q (pfile);
	  if (PEEKC () != '#')
	    return CPP_STRINGIZE;
	      
	  FORWARD (1);
	  CPP_PUTC_Q (pfile, '#');
	  CPP_NUL_TERMINATE_Q (pfile);
	  return CPP_TOKPASTE;
	}

      if (!pfile->only_seen_white)
	goto randomchar;
      return CPP_DIRECTIVE;

    case '\"':
    case '\'':
      parse_string (pfile, c);
      pfile->only_seen_white = 0;
      return c == '\'' ? CPP_CHAR : CPP_STRING;

    case '$':
      if (!CPP_OPTION (pfile, dollars_in_ident))
	goto randomchar;
      goto letter;

    case ':':
      if (CPP_OPTION (pfile, cplusplus) && PEEKC () == ':')
	goto op2;
      goto randomchar;

    case '&':
    case '+':
    case '|':
      c2 = PEEKC ();
      if (c2 == c || c2 == '=')
	goto op2;
      goto randomchar;

    case '*':
    case '!':
    case '%':
    case '=':
    case '^':
      if (PEEKC () == '=')
	goto op2;
      goto randomchar;

    case '-':
      c2 = PEEKC ();
      if (c2 == '-')
	{
	  if (CPP_OPTION (pfile, chill))
	    goto comment;  /* Chill style comment */
	  else
	    goto op2;
	}
      else if (c2 == '=')
	goto op2;
      else if (c2 == '>')
	{
	  if (CPP_OPTION (pfile, cplusplus) && PEEKN (1) == '*')
	    {
	      /* In C++, there's a ->* operator.  */
	      token = CPP_OTHER;
	      pfile->only_seen_white = 0;
	      CPP_RESERVE (pfile, 4);
	      CPP_PUTC_Q (pfile, c);
	      CPP_PUTC_Q (pfile, GETC ());
	      CPP_PUTC_Q (pfile, GETC ());
	      CPP_NUL_TERMINATE_Q (pfile);
	      return token;
	    }
	  goto op2;
	}
      goto randomchar;

    case '<':
      if (pfile->parsing_include_directive)
	{
	  for (;;)
	    {
	      CPP_PUTC (pfile, c);
	      if (c == '>')
		break;
	      c = GETC ();
	      if (c == '\n' || c == EOF)
		{
		  cpp_error (pfile,
			     "missing '>' in `#include <FILENAME>'");
		  break;
		}
	      else if (c == '\r')
		{
		  if (!CPP_BUFFER (pfile)->has_escapes)
		    {
		      /* Backslash newline is replaced by nothing. */
		      CPP_ADJUST_WRITTEN (pfile, -1);
		      CPP_BUMP_LINE (pfile);
		    }
		  else
		    {
		      /* We might conceivably get \r- or \r<space> in
			 here.  Just delete 'em. */
		      int d = GETC();
		      if (d != '-' && d != ' ')
			cpp_ice (pfile, "unrecognized escape \\r%c", d);
		      CPP_ADJUST_WRITTEN (pfile, -1);
		    }			  
		}
	    }
	  return CPP_STRING;
	}
      /* else fall through */
    case '>':
      c2 = PEEKC ();
      if (c2 == '=')
	goto op2;
      /* GNU C++ supports MIN and MAX operators <? and >?.  */
      if (c2 != c && (!CPP_OPTION (pfile, cplusplus) || c2 != '?'))
	goto randomchar;
      FORWARD(1);
      CPP_RESERVE (pfile, 4);
      CPP_PUTC (pfile, c);
      CPP_PUTC (pfile, c2);
      c3 = PEEKC ();
      if (c3 == '=')
	CPP_PUTC_Q (pfile, GETC ());
      CPP_NUL_TERMINATE_Q (pfile);
      pfile->only_seen_white = 0;
      return CPP_OTHER;

    case '.':
      c2 = PEEKC ();
      if (ISDIGIT(c2))
	{
	  CPP_RESERVE(pfile, 2);
	  CPP_PUTC_Q (pfile, '.');
	  c = GETC ();
	  goto number;
	}

      /* In C++ there's a .* operator.  */
      if (CPP_OPTION (pfile, cplusplus) && c2 == '*')
	goto op2;

      if (c2 == '.' && PEEKN(1) == '.')
	{
	  CPP_RESERVE(pfile, 4);
	  CPP_PUTC_Q (pfile, '.');
	  CPP_PUTC_Q (pfile, '.');
	  CPP_PUTC_Q (pfile, '.');
	  FORWARD (2);
	  CPP_NUL_TERMINATE_Q (pfile);
	  pfile->only_seen_white = 0;
	  return CPP_3DOTS;
	}
      goto randomchar;

    op2:
      token = CPP_OTHER;
      pfile->only_seen_white = 0;
      CPP_RESERVE(pfile, 3);
      CPP_PUTC_Q (pfile, c);
      CPP_PUTC_Q (pfile, GETC ());
      CPP_NUL_TERMINATE_Q (pfile);
      return token;

    case 'L':
      c2 = PEEKC ();
      if ((c2 == '\'' || c2 == '\"') && !CPP_TRADITIONAL (pfile))
	{
	  CPP_PUTC (pfile, c);
	  c = GETC ();
	  parse_string (pfile, c);
	  pfile->only_seen_white = 0;
	  return c == '\'' ? CPP_WCHAR : CPP_WSTRING;
	}
      goto letter;

    case '0': case '1': case '2': case '3': case '4':
    case '5': case '6': case '7': case '8': case '9':
    number:
    c2  = '.';
    for (;;)
      {
	CPP_RESERVE (pfile, 2);
	CPP_PUTC_Q (pfile, c);
	c = PEEKC ();
	if (c == EOF)
	  break;
	if (!is_numchar(c) && c != '.'
	    && ((c2 != 'e' && c2 != 'E'
		 && ((c2 != 'p' && c2 != 'P')
		     || CPP_OPTION (pfile, c89)))
		|| (c != '+' && c != '-')))
	  break;
	FORWARD(1);
	c2= c;
      }
    CPP_NUL_TERMINATE_Q (pfile);
    pfile->only_seen_white = 0;
    return CPP_NUMBER;
    case 'b': case 'c': case 'd': case 'h': case 'o':
    case 'B': case 'C': case 'D': case 'H': case 'O':
      if (CPP_OPTION (pfile, chill) && PEEKC () == '\'')
	{
	  pfile->only_seen_white = 0;
	  CPP_RESERVE (pfile, 2);
	  CPP_PUTC_Q (pfile, c);
	  CPP_PUTC_Q (pfile, '\'');
	  FORWARD(1);
	  for (;;)
	    {
	      c = GETC();
	      if (c == EOF)
		goto chill_number_eof;
	      if (!is_numchar(c))
		break;
	      CPP_PUTC (pfile, c);
	    }
	  if (c == '\'')
	    {
	      CPP_RESERVE (pfile, 2);
	      CPP_PUTC_Q (pfile, c);
	      CPP_NUL_TERMINATE_Q (pfile);
	      return CPP_STRING;
	    }
	  else
	    {
	      FORWARD(-1);
	    chill_number_eof:
	      CPP_NUL_TERMINATE (pfile);
	      return CPP_NUMBER;
	    }
	}
      else
	goto letter;
    case '_':
    case 'a': case 'e': case 'f': case 'g': case 'i': case 'j':
    case 'k': case 'l': case 'm': case 'n': case 'p': case 'q':
    case 'r': case 's': case 't': case 'u': case 'v': case 'w':
    case 'x': case 'y': case 'z':
    case 'A': case 'E': case 'F': case 'G': case 'I': case 'J':
    case 'K': case 'M': case 'N': case 'P': case 'Q': case 'R':
    case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':
    case 'Y': case 'Z':
    letter:
    pfile->only_seen_white = 0;
    _cpp_parse_name (pfile, c);
    return CPP_MACRO;

    case ' ':  case '\t':  case '\v':
      for (;;)
	{
	  CPP_PUTC (pfile, c);
	  c = PEEKC ();
	  if (c == EOF || !is_hspace(c))
	    break;
	  FORWARD(1);
	}
      return CPP_HSPACE;

    case '\r':
      if (CPP_BUFFER (pfile)->has_escapes)
	{
	  c = GETC ();
	  if (c == '-')
	    {
	      if (pfile->output_escapes)
		CPP_PUTS (pfile, "\r-", 2);
	      _cpp_parse_name (pfile, GETC ());
	      return CPP_NAME;
	    }
	  else if (c == ' ')
	    {
	      CPP_RESERVE (pfile, 2);
	      if (pfile->output_escapes)
		CPP_PUTC_Q (pfile, '\r');
	      CPP_PUTC_Q (pfile, c);
	      return CPP_HSPACE;
	    }
	  else
	    {
	      cpp_ice (pfile, "unrecognized escape \\r%c", c);
	      goto get_next;
	    }
	}
      else
	{
	  /* Backslash newline is ignored. */
	  CPP_BUMP_LINE (pfile);
	  goto get_next;
	}

    case '\n':


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