path: root/gnu/usr.bin/cc/cpp/cexp.c

/*  A Bison parser, made from cexp.y with Bison version GNU Bison version 1.22
  */

#define YYBISON 1  /* Identify Bison output.  */

#define	INT	258
#define	CHAR	259
#define	NAME	260
#define	ERROR	261
#define	OR	262
#define	AND	263
#define	EQUAL	264
#define	NOTEQUAL	265
#define	LEQ	266
#define	GEQ	267
#define	LSH	268
#define	RSH	269
#define	UNARY	270

#line 26 "cexp.y"

#include "config.h"
#include <setjmp.h>
/* #define YYDEBUG 1 */

#ifdef MULTIBYTE_CHARS
#include <stdlib.h>
#include <locale.h>
#endif

#include <stdio.h>

typedef unsigned char U_CHAR;

/* This is used for communicating lists of keywords with cccp.c.  */
struct arglist {
  struct arglist *next;
  U_CHAR *name;
  int length;
  int argno;
};

/* Define a generic NULL if one hasn't already been defined.  */

#ifndef NULL
#define NULL 0
#endif

#ifndef GENERIC_PTR
#if defined (USE_PROTOTYPES) ? USE_PROTOTYPES : defined (__STDC__)
#define GENERIC_PTR void *
#else
#define GENERIC_PTR char *
#endif
#endif

/* Find the largest host integer type and set its size and type.  */

#ifndef HOST_BITS_PER_WIDE_INT

#if HOST_BITS_PER_LONG > HOST_BITS_PER_INT
#define HOST_BITS_PER_WIDE_INT HOST_BITS_PER_LONG
#define HOST_WIDE_INT long
#else
#define HOST_BITS_PER_WIDE_INT HOST_BITS_PER_INT
#define HOST_WIDE_INT int
#endif

#endif

#ifndef NULL_PTR
#define NULL_PTR ((GENERIC_PTR)0)
#endif

int yylex ();
void yyerror ();
HOST_WIDE_INT expression_value;

static jmp_buf parse_return_error;

/* Nonzero means count most punctuation as part of a name.  */
static int keyword_parsing = 0;

/* some external tables of character types */
extern unsigned char is_idstart[], is_idchar[], is_hor_space[];

extern char *xmalloc ();

/* Flag for -pedantic.  */
extern int pedantic;

/* Flag for -traditional.  */
extern int traditional;

#ifndef CHAR_TYPE_SIZE
#define CHAR_TYPE_SIZE BITS_PER_UNIT
#endif

#ifndef INT_TYPE_SIZE
#define INT_TYPE_SIZE BITS_PER_WORD
#endif

#ifndef LONG_TYPE_SIZE
#define LONG_TYPE_SIZE BITS_PER_WORD
#endif

#ifndef WCHAR_TYPE_SIZE
#define WCHAR_TYPE_SIZE INT_TYPE_SIZE
#endif

#ifndef MAX_CHAR_TYPE_SIZE
#define MAX_CHAR_TYPE_SIZE CHAR_TYPE_SIZE
#endif

#ifndef MAX_INT_TYPE_SIZE
#define MAX_INT_TYPE_SIZE INT_TYPE_SIZE
#endif

#ifndef MAX_LONG_TYPE_SIZE
#define MAX_LONG_TYPE_SIZE LONG_TYPE_SIZE
#endif

#ifndef MAX_WCHAR_TYPE_SIZE
#define MAX_WCHAR_TYPE_SIZE WCHAR_TYPE_SIZE
#endif

/* Yield nonzero if adding two numbers with A's and B's signs can yield a
   number with SUM's sign, where A, B, and SUM are all C integers.  */
#define possible_sum_sign(a, b, sum) ((((a) ^ (b)) | ~ ((a) ^ (sum))) < 0)

static void integer_overflow ();
static long left_shift ();
static long right_shift ();

#line 141 "cexp.y"
typedef union {
  struct constant {long value; int unsignedp;} integer;
  struct name {U_CHAR *address; int length;} name;
  struct arglist *keywords;
  int voidval;
  char *sval;
} YYSTYPE;

#ifndef YYLTYPE
typedef
  struct yyltype
    {
      int timestamp;
      int first_line;
      int first_column;
      int last_line;
      int last_column;
      char *text;
   }
  yyltype;

#define YYLTYPE yyltype
#endif

#include <stdio.h>

#ifndef __cplusplus
#ifndef __STDC__
#define const
#endif
#endif



#define	YYFINAL		73
#define	YYFLAG		-32768
#define	YYNTBASE	34

#define YYTRANSLATE(x) ((unsigned)(x) <= 270 ? yytranslate[x] : 39)

static const char yytranslate[] = {     0,
     2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
     2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
     2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
     2,     2,    29,     2,    31,     2,    27,    14,     2,    32,
    33,    25,    23,     9,    24,     2,    26,     2,     2,     2,
     2,     2,     2,     2,     2,     2,     2,     8,     2,    17,
     2,    18,     7,     2,     2,     2,     2,     2,     2,     2,
     2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
     2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
     2,     2,     2,    13,     2,     2,     2,     2,     2,     2,
     2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
     2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
     2,     2,     2,    12,     2,    30,     2,     2,     2,     2,
     2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
     2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
     2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
     2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
     2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
     2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
     2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
     2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
     2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
     2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
     2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
     2,     2,     2,     2,     2,     2,     2,     2,     2,     2,
     2,     2,     2,     2,     2,     1,     2,     3,     4,     5,
     6,    10,    11,    15,    16,    19,    20,    21,    22,    28
};

#if YYDEBUG != 0
static const short yyprhs[] = {     0,
     0,     2,     4,     8,    11,    14,    17,    20,    23,    24,
    31,    35,    39,    43,    47,    51,    55,    59,    63,    67,
    71,    75,    79,    83,    87,    91,    95,    99,   103,   107,
   113,   115,   117,   119,   120,   125
};

static const short yyrhs[] = {    35,
     0,    36,     0,    35,     9,    36,     0,    24,    36,     0,
    29,    36,     0,    23,    36,     0,    30,    36,     0,    31,
     5,     0,     0,    31,     5,    37,    32,    38,    33,     0,
    32,    35,    33,     0,    36,    25,    36,     0,    36,    26,
    36,     0,    36,    27,    36,     0,    36,    23,    36,     0,
    36,    24,    36,     0,    36,    21,    36,     0,    36,    22,
    36,     0,    36,    15,    36,     0,    36,    16,    36,     0,
    36,    19,    36,     0,    36,    20,    36,     0,    36,    17,
    36,     0,    36,    18,    36,     0,    36,    14,    36,     0,
    36,    13,    36,     0,    36,    12,    36,     0,    36,    11,
    36,     0,    36,    10,    36,     0,    36,     7,    36,     8,
    36,     0,     3,     0,     4,     0,     5,     0,     0,    32,
    38,    33,    38,     0,     5,    38,     0
};

#endif

#if YYDEBUG != 0
static const short yyrline[] = { 0,
   173,   178,   179,   186,   191,   194,   196,   199,   203,   205,
   210,   215,   227,   242,   253,   260,   267,   273,   279,   282,
   285,   291,   297,   303,   309,   312,   315,   318,   321,   324,
   327,   329,   331,   336,   338,   351
};

static const char * const yytname[] = {   "$","error","$illegal.","INT","CHAR",
"NAME","ERROR","'?'","':'","','","OR","AND","'|'","'^'","'&'","EQUAL","NOTEQUAL",
"'<'","'>'","LEQ","GEQ","LSH","RSH","'+'","'-'","'*'","'/'","'%'","UNARY","'!'",
"'~'","'#'","'('","')'","start","exp1","exp","@1","keywords",""
};
#endif

static const short yyr1[] = {     0,
    34,    35,    35,    36,    36,    36,    36,    36,    37,    36,
    36,    36,    36,    36,    36,    36,    36,    36,    36,    36,
    36,    36,    36,    36,    36,    36,    36,    36,    36,    36,
    36,    36,    36,    38,    38,    38
};

static const short yyr2[] = {     0,
     1,     1,     3,     2,     2,     2,     2,     2,     0,     6,
     3,     3,     3,     3,     3,     3,     3,     3,     3,     3,
     3,     3,     3,     3,     3,     3,     3,     3,     3,     5,
     1,     1,     1,     0,     4,     2
};

static const short yydefact[] = {     0,
    31,    32,    33,     0,     0,     0,     0,     0,     0,     1,
     2,     6,     4,     5,     7,     8,     0,     0,     0,     0,
     0,     0,     0,     0,     0,     0,     0,     0,     0,     0,
     0,     0,     0,     0,     0,     0,     0,     0,    11,     3,
     0,    29,    28,    27,    26,    25,    19,    20,    23,    24,
    21,    22,    17,    18,    15,    16,    12,    13,    14,    34,
     0,    34,    34,     0,    30,    36,     0,    10,    34,    35,
     0,     0,     0
};

static const short yydefgoto[] = {    71,
    10,    11,    38,    64
};

static const short yypact[] = {    31,
-32768,-32768,-32768,    31,    31,    31,    31,     4,    31,     3,
    80,-32768,-32768,-32768,-32768,     6,    32,    31,    31,    31,
    31,    31,    31,    31,    31,    31,    31,    31,    31,    31,
    31,    31,    31,    31,    31,    31,    31,     7,-32768,    80,
    59,    97,   113,   128,   142,   155,    25,    25,   162,   162,
   162,   162,   167,   167,   -19,   -19,-32768,-32768,-32768,     5,
    31,     5,     5,   -20,    80,-32768,    20,-32768,     5,-32768,
    40,    56,-32768
};

static const short yypgoto[] = {-32768,
    49,    -4,-32768,   -58
};


#define	YYLAST		194


static const short yytable[] = {    12,
    13,    14,    15,    66,    67,    35,    36,    37,    16,    62,
    70,    18,    68,    40,    41,    42,    43,    44,    45,    46,
    47,    48,    49,    50,    51,    52,    53,    54,    55,    56,
    57,    58,    59,     1,     2,     3,    63,    -9,    60,    72,
    18,    27,    28,    29,    30,    31,    32,    33,    34,    35,
    36,    37,    69,     4,     5,    73,    65,    17,     0,     6,
     7,     8,     9,     0,    39,    19,    61,     0,    20,    21,
    22,    23,    24,    25,    26,    27,    28,    29,    30,    31,
    32,    33,    34,    35,    36,    37,    19,     0,     0,    20,
    21,    22,    23,    24,    25,    26,    27,    28,    29,    30,
    31,    32,    33,    34,    35,    36,    37,    21,    22,    23,
    24,    25,    26,    27,    28,    29,    30,    31,    32,    33,
    34,    35,    36,    37,    22,    23,    24,    25,    26,    27,
    28,    29,    30,    31,    32,    33,    34,    35,    36,    37,
    23,    24,    25,    26,    27,    28,    29,    30,    31,    32,
    33,    34,    35,    36,    37,    24,    25,    26,    27,    28,
    29,    30,    31,    32,    33,    34,    35,    36,    37,    25,
    26,    27,    28,    29,    30,    31,    32,    33,    34,    35,
    36,    37,    31,    32,    33,    34,    35,    36,    37,    33,
    34,    35,    36,    37
};

static const short yycheck[] = {     4,
     5,     6,     7,    62,    63,    25,    26,    27,     5,     5,
    69,     9,    33,    18,    19,    20,    21,    22,    23,    24,
    25,    26,    27,    28,    29,    30,    31,    32,    33,    34,
    35,    36,    37,     3,     4,     5,    32,    32,    32,     0,
     9,    17,    18,    19,    20,    21,    22,    23,    24,    25,
    26,    27,    33,    23,    24,     0,    61,     9,    -1,    29,
    30,    31,    32,    -1,    33,     7,     8,    -1,    10,    11,
    12,    13,    14,    15,    16,    17,    18,    19,    20,    21,
    22,    23,    24,    25,    26,    27,     7,    -1,    -1,    10,
    11,    12,    13,    14,    15,    16,    17,    18,    19,    20,
    21,    22,    23,    24,    25,    26,    27,    11,    12,    13,
    14,    15,    16,    17,    18,    19,    20,    21,    22,    23,
    24,    25,    26,    27,    12,    13,    14,    15,    16,    17,
    18,    19,    20,    21,    22,    23,    24,    25,    26,    27,
    13,    14,    15,    16,    17,    18,    19,    20,    21,    22,
    23,    24,    25,    26,    27,    14,    15,    16,    17,    18,
    19,    20,    21,    22,    23,    24,    25,    26,    27,    15,
    16,    17,    18,    19,    20,    21,    22,    23,    24,    25,
    26,    27,    21,    22,    23,    24,    25,    26,    27,    23,
    24,    25,    26,    27
};
/* -*-C-*-  Note some compilers choke on comments on `#line' lines.  */
#line 3 "/usr/local/lib/bison.simple"

/* Skeleton output parser for bison,
   Copyright (C) 1984, 1989, 1990 Bob Corbett and Richard Stallman

   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 1, 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, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */


#ifndef alloca
#ifdef __GNUC__
#define alloca __builtin_alloca
#else /* not GNU C.  */
#if (!defined (__STDC__) && defined (sparc)) || defined (__sparc__) || defined (__sparc) || defined (__sgi)
#include <alloca.h>
#else /* not sparc */
#if defined (MSDOS) && !defined (__TURBOC__)
#include <malloc.h>
#else /* not MSDOS, or __TURBOC__ */
#if defined(_AIX)
#include <malloc.h>
 #pragma alloca
#else /* not MSDOS, __TURBOC__, or _AIX */
#ifdef __hpux
#ifdef __cplusplus
extern "C" {
void *alloca (unsigned int);
};
#else /* not __cplusplus */
void *alloca ();
#endif /* not __cplusplus */
#endif /* __hpux */
#endif /* not _AIX */
#endif /* not MSDOS, or __TURBOC__ */
#endif /* not sparc.  */
#endif /* not GNU C.  */
#endif /* alloca not defined.  */

/* This is the parser code that is written into each bison parser
  when the %semantic_parser declaration is not specified in the grammar.
  It was written by Richard Stallman by simplifying the hairy parser
  used when %semantic_parser is specified.  */

/* Note: there must be only one dollar sign in this file.
   It is replaced by the list of actions, each action
   as one case of the switch.  */

#define yyerrok		(yyerrstatus = 0)
#define yyclearin	(yychar = YYEMPTY)
#define YYEMPTY		-2
#define YYEOF		0
#define YYACCEPT	return(0)
#define YYABORT 	return(1)
#define YYERROR		goto yyerrlab1
/* Like YYERROR except do call yyerror.
   This remains here temporarily to ease the
   transition to the new meaning of YYERROR, for GCC.
   Once GCC version 2 has supplanted version 1, this can go.  */
#define YYFAIL		goto yyerrlab
#define YYRECOVERING()  (!!yyerrstatus)
#define YYBACKUP(token, value) \
do								\
  if (yychar == YYEMPTY && yylen == 1)				\
    { yychar = (token), yylval = (value);			\
      yychar1 = YYTRANSLATE (yychar);				\
      YYPOPSTACK;						\
      goto yybackup;						\
    }								\
  else								\
    { yyerror ("syntax error: cannot back up"); YYERROR; }	\
while (0)

#define YYTERROR	1
#define YYERRCODE	256

#ifndef YYPURE
#define YYLEX		yylex()
#endif

#ifdef YYPURE
#ifdef YYLSP_NEEDED
#define YYLEX		yylex(&yylval, &yylloc)
#else
#define YYLEX		yylex(&yylval)
#endif
#endif

/* If nonreentrant, generate the variables here */

#ifndef YYPURE

int	yychar;			/*  the lookahead symbol		*/
YYSTYPE	yylval;			/*  the semantic value of the		*/
				/*  lookahead symbol			*/

#ifdef YYLSP_NEEDED
YYLTYPE yylloc;			/*  location data for the lookahead	*/
				/*  symbol				*/
#endif

int yynerrs;			/*  number of parse errors so far       */
#endif  /* not YYPURE */

#if YYDEBUG != 0
int yydebug;			/*  nonzero means print parse trace	*/
/* Since this is uninitialized, it does not stop multiple parsers
   from coexisting.  */
#endif

/*  YYINITDEPTH indicates the initial size of the parser's stacks	*/

#ifndef	YYINITDEPTH
#define YYINITDEPTH 200
#endif

/*  YYMAXDEPTH is the maximum size the stacks can grow to
    (effective only if the built-in stack extension method is used).  */

#if YYMAXDEPTH == 0
#undef YYMAXDEPTH
#endif

#ifndef YYMAXDEPTH
#define YYMAXDEPTH 10000
#endif

/* Prevent warning if -Wstrict-prototypes.  */
#ifdef __GNUC__
int yyparse (void);
#endif

#if __GNUC__ > 1		/* GNU C and GNU C++ define this.  */
#define __yy_bcopy(FROM,TO,COUNT)	__builtin_memcpy(TO,FROM,COUNT)
#else				/* not GNU C or C++ */
#ifndef __cplusplus

/* This is the most reliable way to avoid incompatibilities
   in available built-in functions on various systems.  */
static void
__yy_bcopy (from, to, count)
     char *from;
     char *to;
     int count;
{
  register char *f = from;
  register char *t = to;
  register int i = count;

  while (i-- > 0)
    *t++ = *f++;
}

#else /* __cplusplus */

/* This is the most reliable way to avoid incompatibilities
   in available built-in functions on various systems.  */
static void
__yy_bcopy (char *from, char *to, int count)
{
  register char *f = from;
  register char *t = to;
  register int i = count;

  while (i-- > 0)
    *t++ = *f++;
}

#endif
#endif

#line 184 "/usr/local/lib/bison.simple"

/* The user can define YYPARSE_PARAM as the name of an argument to be passed
   into yyparse.  The argument should have type void *.
   It should actually point to an object.
   Grammar actions can access the variable by casting it
   to the proper pointer type.  */

#ifdef YYPARSE_PARAM
#define YYPARSE_PARAM_DECL void *YYPARSE_PARAM;
#else
#define YYPARSE_PARAM
#define YYPARSE_PARAM_DECL
#endif

int
yyparse(YYPARSE_PARAM)
     YYPARSE_PARAM_DECL
{
  register int yystate;
  register int yyn;
  register short *yyssp;
  register YYSTYPE *yyvsp;
  int yyerrstatus;	/*  number of tokens to shift before error messages enabled */
  int yychar1 = 0;		/*  lookahead token as an internal (translated) token number */

  short	yyssa[YYINITDEPTH];	/*  the state stack			*/
  YYSTYPE yyvsa[YYINITDEPTH];	/*  the semantic value stack		*/

  short *yyss = yyssa;		/*  refer to the stacks thru separate pointers */
  YYSTYPE *yyvs = yyvsa;	/*  to allow yyoverflow to reallocate them elsewhere */

#ifdef YYLSP_NEEDED
  YYLTYPE yylsa[YYINITDEPTH];	/*  the location stack			*/
  YYLTYPE *yyls = yylsa;
  YYLTYPE *yylsp;

#define YYPOPSTACK   (yyvsp--, yyssp--, yylsp--)
#else
#define YYPOPSTACK   (yyvsp--, yyssp--)
#endif

  int yystacksize = YYINITDEPTH;

#ifdef YYPURE
  int yychar;
  YYSTYPE yylval;
  int yynerrs;
#ifdef YYLSP_NEEDED
  YYLTYPE yylloc;
#endif
#endif

  YYSTYPE yyval;		/*  the variable used to return		*/
				/*  semantic values from the action	*/
				/*  routines				*/

  int yylen;

#if YYDEBUG != 0
  if (yydebug)
    fprintf(stderr, "Starting parse\n");
#endif

  yystate = 0;
  yyerrstatus = 0;
  yynerrs = 0;
  yychar = YYEMPTY;		/* Cause a token to be read.  */

  /* Initialize stack pointers.
     Waste one element of value and location stack
     so that they stay on the same level as the state stack.
     The wasted elements are never initialized.  */

  yyssp = yyss - 1;
  yyvsp = yyvs;
#ifdef YYLSP_NEEDED
  yylsp = yyls;
#endif

/* Push a new state, which is found in  yystate  .  */
/* In all cases, when you get here, the value and location stacks
   have just been pushed. so pushing a state here evens the stacks.  */
yynewstate:

  *++yyssp = yystate;

  if (yyssp >= yyss + yystacksize - 1)
    {
      /* Give user a chance to reallocate the stack */
      /* Use copies of these so that the &'s don't force the real ones into memory. */
      YYSTYPE *yyvs1 = yyvs;
      short *yyss1 = yyss;
#ifdef YYLSP_NEEDED
      YYLTYPE *yyls1 = yyls;
#endif

      /* Get the current used size of the three stacks, in elements.  */
      int size = yyssp - yyss + 1;

#ifdef yyoverflow
      /* Each stack pointer address is followed by the size of
	 the data in use in that stack, in bytes.  */
#ifdef YYLSP_NEEDED
      /* This used to be a conditional around just the two extra args,
	 but that might be undefined if yyoverflow is a macro.  */
      yyoverflow("parser stack overflow",
		 &yyss1, size * sizeof (*yyssp),
		 &yyvs1, size * sizeof (*yyvsp),
		 &yyls1, size * sizeof (*yylsp),
		 &yystacksize);
#else
      yyoverflow("parser stack overflow",
		 &yyss1, size * sizeof (*yyssp),
		 &yyvs1, size * sizeof (*yyvsp),
		 &yystacksize);
#endif

      yyss = yyss1; yyvs = yyvs1;
#ifdef YYLSP_NEEDED
      yyls = yyls1;
#endif
#else /* no yyoverflow */
      /* Extend the stack our own way.  */
      if (yystacksize >= YYMAXDEPTH)
	{
	  yyerror("parser stack overflow");
	  return 2;
	}
      yystacksize *= 2;
      if (yystacksize > YYMAXDEPTH)
	yystacksize = YYMAXDEPTH;
      yyss = (short *) alloca (yystacksize * sizeof (*yyssp));
      __yy_bcopy ((char *)yyss1, (char *)yyss, size * sizeof (*yyssp));
      yyvs = (YYSTYPE *) alloca (yystacksize * sizeof (*yyvsp));
      __yy_bcopy ((char *)yyvs1, (char *)yyvs, size * sizeof (*yyvsp));
#ifdef YYLSP_NEEDED
      yyls = (YYLTYPE *) alloca (yystacksize * sizeof (*yylsp));
      __yy_bcopy ((char *)yyls1, (char *)yyls, size * sizeof (*yylsp));
#endif
#endif /* no yyoverflow */

      yyssp = yyss + size - 1;
      yyvsp = yyvs + size - 1;
#ifdef YYLSP_NEEDED
      yylsp = yyls + size - 1;
#endif

#if YYDEBUG != 0
      if (yydebug)
	fprintf(stderr, "Stack size increased to %d\n", yystacksize);
#endif

      if (yyssp >= yyss + yystacksize - 1)
	YYABORT;
    }

#if YYDEBUG != 0
  if (yydebug)
    fprintf(stderr, "Entering state %d\n", yystate);
#endif

  goto yybackup;
 yybackup:

/* Do appropriate processing given the current state.  */
/* Read a lookahead token if we need one and don't already have one.  */
/* yyresume: */

  /* First try to decide what to do without reference to lookahead token.  */

  yyn = yypact[yystate];
  if (yyn == YYFLAG)
    goto yydefault;

  /* Not known => get a lookahead token if don't already have one.  */

  /* yychar is either YYEMPTY or YYEOF
     or a valid token in external form.  */

  if (yychar == YYEMPTY)
    {
#if YYDEBUG != 0
      if (yydebug)
	fprintf(stderr, "Reading a token: ");
#endif
      yychar = YYLEX;
    }

  /* Convert token to internal form (in yychar1) for indexing tables with */

  if (yychar <= 0)		/* This means end of input. */
    {
      yychar1 = 0;
      yychar = YYEOF;		/* Don't call YYLEX any more */

#if YYDEBUG != 0
      if (yydebug)
	fprintf(stderr, "Now at end of input.\n");
#endif
    }
  else
    {
      yychar1 = YYTRANSLATE(yychar);

#if YYDEBUG != 0
      if (yydebug)
	{
	  fprintf (stderr, "Next token is %d (%s", yychar, yytname[yychar1]);
	  /* Give the individual parser a way to print the precise meaning
	     of a token, for further debugging info.  */
#ifdef YYPRINT
	  YYPRINT (stderr, yychar, yylval);
#endif
	  fprintf (stderr, ")\n");
	}
#endif
    }

  yyn += yychar1;
  if (yyn < 0 || yyn > YYLAST || yycheck[yyn] != yychar1)
    goto yydefault;

  yyn = yytable[yyn];

  /* yyn is what to do for this token type in this state.
     Negative => reduce, -yyn is rule number.
     Positive => shift, yyn is new state.
       New state is final state => don't bother to shift,
       just return success.
     0, or most negative number => error.  */

  if (yyn < 0)
    {
      if (yyn == YYFLAG)
	goto yyerrlab;
      yyn = -yyn;
      goto yyreduce;
    }
  else if (yyn == 0)
    goto yyerrlab;

  if (yyn == YYFINAL)
    YYACCEPT;

  /* Shift the lookahead token.  */

#if YYDEBUG != 0
  if (yydebug)
    fprintf(stderr, "Shifting token %d (%s), ", yychar, yytname[yychar1]);
#endif

  /* Discard the token being shifted unless it is eof.  */
  if (yychar != YYEOF)
    yychar = YYEMPTY;

  *++yyvsp = yylval;
#ifdef YYLSP_NEEDED
  *++yylsp = yylloc;
#endif

  /* count tokens shifted since error; after three, turn off error status.  */
  if (yyerrstatus) yyerrstatus--;

  yystate = yyn;
  goto yynewstate;

/* Do the default action for the current state.  */
yydefault:

  yyn = yydefact[yystate];
  if (yyn == 0)
    goto yyerrlab;

/* Do a reduction.  yyn is the number of a rule to reduce with.  */
yyreduce:
  yylen = yyr2[yyn];
  if (yylen > 0)
    yyval = yyvsp[1-yylen]; /* implement default value of the action */

#if YYDEBUG != 0
  if (yydebug)
    {
      int i;

      fprintf (stderr, "Reducing via rule %d (line %d), ",
	       yyn, yyrline[yyn]);

      /* Print the symbols being reduced, and their result.  */
      for (i = yyprhs[yyn]; yyrhs[i] > 0; i++)
	fprintf (stderr, "%s ", yytname[yyrhs[i]]);
      fprintf (stderr, " -> %s\n", yytname[yyr1[yyn]]);
    }
#endif


  switch (yyn) {

case 1:
#line 174 "cexp.y"
{ expression_value = yyvsp[0].integer.value; ;
    break;}
case 3:
#line 180 "cexp.y"
{ if (pedantic)
			    pedwarn ("comma operator in operand of `#if'");
			  yyval.integer = yyvsp[0].integer; ;
    break;}
case 4:
#line 187 "cexp.y"
{ yyval.integer.value = - yyvsp[0].integer.value;
			  if ((yyval.integer.value & yyvsp[0].integer.value) < 0 && ! yyvsp[0].integer.unsignedp)
			    integer_overflow ();
			  yyval.integer.unsignedp = yyvsp[0].integer.unsignedp; ;
    break;}
case 5:
#line 192 "cexp.y"
{ yyval.integer.value = ! yyvsp[0].integer.value;
			  yyval.integer.unsignedp = 0; ;
    break;}
case 6:
#line 195 "cexp.y"
{ yyval.integer = yyvsp[0].integer; ;
    break;}
case 7:
#line 197 "cexp.y"
{ yyval.integer.value = ~ yyvsp[0].integer.value;
			  yyval.integer.unsignedp = yyvsp[0].integer.unsignedp; ;
    break;}
case 8:
#line 200 "cexp.y"
{ yyval.integer.value = check_assertion (yyvsp[0].name.address, yyvsp[0].name.length,
						      0, NULL_PTR);
			  yyval.integer.unsignedp = 0; ;
    break;}
case 9:
#line 204 "cexp.y"
{ keyword_parsing = 1; ;
    break;}
case 10:
#line 206 "cexp.y"
{ yyval.integer.value = check_assertion (yyvsp[-4].name.address, yyvsp[-4].name.length,
						      1, yyvsp[-1].keywords);
			  keyword_parsing = 0;
			  yyval.integer.unsignedp = 0; ;
    break;}
case 11:
#line 211 "cexp.y"
{ yyval.integer = yyvsp[-1].integer; ;
    break;}
case 12:
#line 216 "cexp.y"
{ yyval.integer.unsignedp = yyvsp[-2].integer.unsignedp || yyvsp[0].integer.unsignedp;
			  if (yyval.integer.unsignedp)
			    yyval.integer.value = (unsigned long) yyvsp[-2].integer.value * yyvsp[0].integer.value;
			  else
			    {
			      yyval.integer.value = yyvsp[-2].integer.value * yyvsp[0].integer.value;
			      if (yyvsp[-2].integer.value
				  && (yyval.integer.value / yyvsp[-2].integer.value != yyvsp[0].integer.value
				      || (yyval.integer.value & yyvsp[-2].integer.value & yyvsp[0].integer.value) < 0))
				integer_overflow ();
			    } ;
    break;}
case 13:
#line 228 "cexp.y"
{ if (yyvsp[0].integer.value == 0)
			    {
			      error ("division by zero in #if");
			      yyvsp[0].integer.value = 1;
			    }
			  yyval.integer.unsignedp = yyvsp[-2].integer.unsignedp || yyvsp[0].integer.unsignedp;
			  if (yyval.integer.unsignedp)
			    yyval.integer.value = (unsigned long) yyvsp[-2].integer.value / yyvsp[0].integer.value;
			  else
			    {
			      yyval.integer.value = yyvsp[-2].integer.value / yyvsp[0].integer.value;
			      if ((yyval.integer.value & yyvsp[-2].integer.value & yyvsp[0].integer.value) < 0)
				integer_overflow ();
			    } ;
    break;}
case 14:
#line 243 "cexp.y"
{ if (yyvsp[0].integer.value == 0)
			    {
			      error ("division by zero in #if");
			      yyvsp[0].integer.value = 1;
			    }
			  yyval.integer.unsignedp = yyvsp[-2].integer.unsignedp || yyvsp[0].integer.unsignedp;
			  if (yyval.integer.unsignedp)
			    yyval.integer.value = (unsigned long) yyvsp[-2].integer.value % yyvsp[0].integer.value;
			  else
			    yyval.integer.value = yyvsp[-2].integer.value % yyvsp[0].integer.value; ;
    break;}
case 15:
#line 254 "cexp.y"
{ yyval.integer.value = yyvsp[-2].integer.value + yyvsp[0].integer.value;
			  yyval.integer.unsignedp = yyvsp[-2].integer.unsignedp || yyvsp[0].integer.unsignedp;
			  if (! yyval.integer.unsignedp
			      && ! possible_sum_sign (yyvsp[-2].integer.value, yyvsp[0].integer.value,
						      yyval.integer.value))
			    integer_overflow (); ;
    break;}
case 16:
#line 261 "cexp.y"
{ yyval.integer.value = yyvsp[-2].integer.value - yyvsp[0].integer.value;
			  yyval.integer.unsignedp = yyvsp[-2].integer.unsignedp || yyvsp[0].integer.unsignedp;
			  if (! yyval.integer.unsignedp
			      && ! possible_sum_sign (yyval.integer.value, yyvsp[0].integer.value,
						      yyvsp[-2].integer.value))
			    integer_overflow (); ;
    break;}
case 17:
#line 268 "cexp.y"
{ yyval.integer.unsignedp = yyvsp[-2].integer.unsignedp;
			  if (yyvsp[0].integer.value < 0 && ! yyvsp[0].integer.unsignedp)
			    yyval.integer.value = right_shift (&yyvsp[-2].integer, -yyvsp[0].integer.value);
			  else
			    yyval.integer.value = left_shift (&yyvsp[-2].integer, yyvsp[0].integer.value); ;
    break;}
case 18:
#line 274 "cexp.y"
{ yyval.integer.unsignedp = yyvsp[-2].integer.unsignedp;
			  if (yyvsp[0].integer.value < 0 && ! yyvsp[0].integer.unsignedp)
			    yyval.integer.value = left_shift (&yyvsp[-2].integer, -yyvsp[0].integer.value);
			  else
			    yyval.integer.value = right_shift (&yyvsp[-2].integer, yyvsp[0].integer.value); ;
    break;}
case 19:
#line 280 "cexp.y"
{ yyval.integer.value = (yyvsp[-2].integer.value == yyvsp[0].integer.value);
			  yyval.integer.unsignedp = 0; ;
    break;}
case 20:
#line 283 "cexp.y"
{ yyval.integer.value = (yyvsp[-2].integer.value != yyvsp[0].integer.value);
			  yyval.integer.unsignedp = 0; ;
    break;}
case 21:
#line 286 "cexp.y"
{ yyval.integer.unsignedp = 0;
			  if (yyvsp[-2].integer.unsignedp || yyvsp[0].integer.unsignedp)
			    yyval.integer.value = (unsigned long) yyvsp[-2].integer.value <= yyvsp[0].integer.value;
			  else
			    yyval.integer.value = yyvsp[-2].integer.value <= yyvsp[0].integer.value; ;
    break;}
case 22:
#line 292 "cexp.y"
{ yyval.integer.unsignedp = 0;
			  if (yyvsp[-2].integer.unsignedp || yyvsp[0].integer.unsignedp)
			    yyval.integer.value = (unsigned long) yyvsp[-2].integer.value >= yyvsp[0].integer.value;
			  else
			    yyval.integer.value = yyvsp[-2].integer.value >= yyvsp[0].integer.value; ;
    break;}
case 23:
#line 298 "cexp.y"
{ yyval.integer.unsignedp = 0;
			  if (yyvsp[-2].integer.unsignedp || yyvsp[0].integer.unsignedp)
			    yyval.integer.value = (unsigned long) yyvsp[-2].integer.value < yyvsp[0].integer.value;
			  else
			    yyval.integer.value = yyvsp[-2].integer.value < yyvsp[0].integer.value; ;
    break;}
case 24:
#line 304 "cexp.y"
{ yyval.integer.unsignedp = 0;
			  if (yyvsp[-2].integer.unsignedp || yyvsp[0].integer.unsignedp)
			    yyval.integer.value = (unsigned long) yyvsp[-2].integer.value > yyvsp[0].integer.value;
			  else
			    yyval.integer.value = yyvsp[-2].integer.value > yyvsp[0].integer.value; ;
    break;}
case 25:
#line 310 "cexp.y"
{ yyval.integer.value = yyvsp[-2].integer.value & yyvsp[0].integer.value;
			  yyval.integer.unsignedp = yyvsp[-2].integer.unsignedp || yyvsp[0].integer.unsignedp; ;
    break;}
case 26:
#line 313 "cexp.y"
{ yyval.integer.value = yyvsp[-2].integer.value ^ yyvsp[0].integer.value;
			  yyval.integer.unsignedp = yyvsp[-2].integer.unsignedp || yyvsp[0].integer.unsignedp; ;
    break;}
case 27:
#line 316 "cexp.y"
{ yyval.integer.value = yyvsp[-2].integer.value | yyvsp[0].integer.value;
			  yyval.integer.unsignedp = yyvsp[-2].integer.unsignedp || yyvsp[0].integer.unsignedp; ;
    break;}
case 28:
#line 319 "cexp.y"
{ yyval.integer.value = (yyvsp[-2].integer.value && yyvsp[0].integer.value);
			  yyval.integer.unsignedp = 0; ;
    break;}
case 29:
#line 322 "cexp.y"
{ yyval.integer.value = (yyvsp[-2].integer.value || yyvsp[0].integer.value);
			  yyval.integer.unsignedp = 0; ;
    break;}
case 30:
#line 325 "cexp.y"
{ yyval.integer.value = yyvsp[-4].integer.value ? yyvsp[-2].integer.value : yyvsp[0].integer.value;
			  yyval.integer.unsignedp = yyvsp[-2].integer.unsignedp || yyvsp[0].integer.unsignedp; ;
    break;}
case 31:
#line 328 "cexp.y"
{ yyval.integer = yylval.integer; ;
    break;}
case 32:
#line 330 "cexp.y"
{ yyval.integer = yylval.integer; ;
    break;}
case 33:
#line 332 "cexp.y"
{ yyval.integer.value = 0;
			  yyval.integer.unsignedp = 0; ;
    break;}
case 34:
#line 337 "cexp.y"
{ yyval.keywords = 0; ;
    break;}
case 35:
#line 339 "cexp.y"
{ struct arglist *temp;
			  yyval.keywords = (struct arglist *) xmalloc (sizeof (struct arglist));
			  yyval.keywords->next = yyvsp[-2].keywords;
			  yyval.keywords->name = (U_CHAR *) "(";
			  yyval.keywords->length = 1;
			  temp = yyval.keywords;
			  while (temp != 0 && temp->next != 0)
			    temp = temp->next;
			  temp->next = (struct arglist *) xmalloc (sizeof (struct arglist));
			  temp->next->next = yyvsp[0].keywords;
			  temp->next->name = (U_CHAR *) ")";
			  temp->next->length = 1; ;
    break;}
case 36:
#line 352 "cexp.y"
{ yyval.keywords = (struct arglist *) xmalloc (sizeof (struct arglist));
			  yyval.keywords->name = yyvsp[-1].name.address;
			  yyval.keywords->length = yyvsp[-1].name.length;
			  yyval.keywords->next = yyvsp[0].keywords; ;
    break;}
}
   /* the action file gets copied in in place of this dollarsign */
#line 480 "/usr/local/lib/bison.simple"

  yyvsp -= yylen;
  yyssp -= yylen;
#ifdef YYLSP_NEEDED
  yylsp -= yylen;
#endif

#if YYDEBUG != 0
  if (yydebug)
    {
      short *ssp1 = yyss - 1;
      fprintf (stderr, "state stack now");
      while (ssp1 != yyssp)
	fprintf (stderr, " %d", *++ssp1);
      fprintf (stderr, "\n");
    }
#endif

  *++yyvsp = yyval;

#ifdef YYLSP_NEEDED
  yylsp++;
  if (yylen == 0)
    {
      yylsp->first_line = yylloc.first_line;
      yylsp->first_column = yylloc.first_column;
      yylsp->last_line = (yylsp-1)->last_line;
      yylsp->last_column = (yylsp-1)->last_column;
      yylsp->text = 0;
    }
  else
    {
      yylsp->last_line = (yylsp+yylen-1)->last_line;
      yylsp->last_column = (yylsp+yylen-1)->last_column;
    }
#endif

  /* Now "shift" the result of the reduction.
     Determine what state that goes to,
     based on the state we popped back to
     and the rule number reduced by.  */

  yyn = yyr1[yyn];

  yystate = yypgoto[yyn - YYNTBASE] + *yyssp;
  if (yystate >= 0 && yystate <= YYLAST && yycheck[yystate] == *yyssp)
    yystate = yytable[yystate];
  else
    yystate = yydefgoto[yyn - YYNTBASE];

  goto yynewstate;

yyerrlab:   /* here on detecting error */

  if (! yyerrstatus)
    /* If not already recovering from an error, report this error.  */
    {
      ++yynerrs;

#ifdef YYERROR_VERBOSE
      yyn = yypact[yystate];

      if (yyn > YYFLAG && yyn < YYLAST)
	{
	  int size = 0;
	  char *msg;
	  int x, count;

	  count = 0;
	  /* Start X at -yyn if nec to avoid negative indexes in yycheck.  */
	  for (x = (yyn < 0 ? -yyn : 0);
	       x < (sizeof(yytname) / sizeof(char *)); x++)
	    if (yycheck[x + yyn] == x)
	      size += strlen(yytname[x]) + 15, count++;
	  msg = (char *) malloc(size + 15);
	  if (msg != 0)
	    {
	      strcpy(msg, "parse error");

	      if (count < 5)
		{
		  count = 0;
		  for (x = (yyn < 0 ? -yyn : 0);
		       x < (sizeof(yytname) / sizeof(char *)); x++)
		    if (yycheck[x + yyn] == x)
		      {
			strcat(msg, count == 0 ? ", expecting `" : " or `");
			strcat(msg, yytname[x]);
			strcat(msg, "'");
			count++;
		      }
		}
	      yyerror(msg);
	      free(msg);
	    }
	  else
	    yyerror ("parse error; also virtual memory exceeded");
	}
      else
#endif /* YYERROR_VERBOSE */
	yyerror("parse error");
    }

  goto yyerrlab1;
yyerrlab1:   /* here on error raised explicitly by an action */

  if (yyerrstatus == 3)
    {
      /* if just tried and failed to reuse lookahead token after an error, discard it.  */

      /* return failure if at end of input */
      if (yychar == YYEOF)
	YYABORT;

#if YYDEBUG != 0
      if (yydebug)
	fprintf(stderr, "Discarding token %d (%s).\n", yychar, yytname[yychar1]);
#endif

      yychar = YYEMPTY;
    }

  /* Else will try to reuse lookahead token
     after shifting the error token.  */

  yyerrstatus = 3;		/* Each real token shifted decrements this */

  goto yyerrhandle;

yyerrdefault:  /* current state does not do anything special for the error token. */

#if 0
  /* This is wrong; only states that explicitly want error tokens
     should shift them.  */
  yyn = yydefact[yystate];  /* If its default is to accept any token, ok.  Otherwise pop it.*/
  if (yyn) goto yydefault;
#endif

yyerrpop:   /* pop the current state because it cannot handle the error token */

  if (yyssp == yyss) YYABORT;
  yyvsp--;
  yystate = *--yyssp;
#ifdef YYLSP_NEEDED
  yylsp--;
#endif

#if YYDEBUG != 0
  if (yydebug)
    {
      short *ssp1 = yyss - 1;
      fprintf (stderr, "Error: state stack now");
      while (ssp1 != yyssp)
	fprintf (stderr, " %d", *++ssp1);
      fprintf (stderr, "\n");
    }
#endif

yyerrhandle:

  yyn = yypact[yystate];
  if (yyn == YYFLAG)
    goto yyerrdefault;

  yyn += YYTERROR;
  if (yyn < 0 || yyn > YYLAST || yycheck[yyn] != YYTERROR)
    goto yyerrdefault;

  yyn = yytable[yyn];
  if (yyn < 0)
    {
      if (yyn == YYFLAG)
	goto yyerrpop;
      yyn = -yyn;
      goto yyreduce;
    }
  else if (yyn == 0)
    goto yyerrpop;

  if (yyn == YYFINAL)
    YYACCEPT;

#if YYDEBUG != 0
  if (yydebug)
    fprintf(stderr, "Shifting error token, ");
#endif

  *++yyvsp = yylval;
#ifdef YYLSP_NEEDED
  *++yylsp = yylloc;
#endif

  yystate = yyn;
  goto yynewstate;
}
#line 357 "cexp.y"


/* During parsing of a C expression, the pointer to the next character
   is in this variable.  */

static char *lexptr;

/* Take care of parsing a number (anything that starts with a digit).
   Set yylval and return the token type; update lexptr.
   LEN is the number of characters in it.  */

/* maybe needs to actually deal with floating point numbers */

int
parse_number (olen)
     int olen;
{
  register char *p = lexptr;
  register int c;
  register unsigned long n = 0, nd, ULONG_MAX_over_base;
  register int base = 10;
  register int len = olen;
  register int overflow = 0;
  register int digit, largest_digit = 0;
  int spec_long = 0;

  for (c = 0; c < len; c++)
    if (p[c] == '.') {
      /* It's a float since it contains a point.  */
      yyerror ("floating point numbers not allowed in #if expressions");
      return ERROR;
    }

  yylval.integer.unsignedp = 0;

  if (len >= 3 && (!strncmp (p, "0x", 2) || !strncmp (p, "0X", 2))) {
    p += 2;
    base = 16;
    len -= 2;
  }
  else if (*p == '0')
    base = 8;

  ULONG_MAX_over_base = (unsigned long) -1 / base;

  for (; len > 0; len--) {
    c = *p++;

    if (c >= '0' && c <= '9')
      digit = c - '0';
    else if (base == 16 && c >= 'a' && c <= 'f')
      digit = c - 'a' + 10;
    else if (base == 16 && c >= 'A' && c <= 'F')
      digit = c - 'A' + 10;
    else {
      /* `l' means long, and `u' means unsigned.  */
      while (1) {
	if (c == 'l' || c == 'L')
	  {
	    if (spec_long)
	      yyerror ("two `l's in integer constant");
	    spec_long = 1;
	  }
	else if (c == 'u' || c == 'U')
	  {
	    if (yylval.integer.unsignedp)
	      yyerror ("two `u's in integer constant");
	    yylval.integer.unsignedp = 1;
	  }
	else
	  break;

	if (--len == 0)
	  break;
	c = *p++;
      }
      /* Don't look for any more digits after the suffixes.  */
      break;
    }
    if (largest_digit < digit)
      largest_digit = digit;
    nd = n * base + digit;
    overflow |= ULONG_MAX_over_base < n | nd < n;
    n = nd;
  }

  if (len != 0) {
    yyerror ("Invalid number in #if expression");
    return ERROR;
  }

  if (base <= largest_digit)
    warning ("integer constant contains digits beyond the radix");

  if (overflow)
    warning ("integer constant out of range");

  /* If too big to be signed, consider it unsigned.  */
  if ((long) n < 0 && ! yylval.integer.unsignedp)
    {
      if (base == 10)
	warning ("integer constant is so large that it is unsigned");
      yylval.integer.unsignedp = 1;
    }

  lexptr = p;
  yylval.integer.value = n;
  return INT;
}

struct token {
  char *operator;
  int token;
};

static struct token tokentab2[] = {
  {"&&", AND},
  {"||", OR},
  {"<<", LSH},
  {">>", RSH},
  {"==", EQUAL},
  {"!=", NOTEQUAL},
  {"<=", LEQ},
  {">=", GEQ},
  {"++", ERROR},
  {"--", ERROR},
  {NULL, ERROR}
};

/* Read one token, getting characters through lexptr.  */

int
yylex ()
{
  register int c;
  register int namelen;
  register unsigned char *tokstart;
  register struct token *toktab;
  int wide_flag;

 retry:

  tokstart = (unsigned char *) lexptr;
  c = *tokstart;
  /* See if it is a special token of length 2.  */
  if (! keyword_parsing)
    for (toktab = tokentab2; toktab->operator != NULL; toktab++)
      if (c == *toktab->operator && tokstart[1] == toktab->operator[1]) {
	lexptr += 2;
	if (toktab->token == ERROR)
	  {
	    char *buf = (char *) alloca (40);
	    sprintf (buf, "`%s' not allowed in operand of `#if'", toktab->operator);
	    yyerror (buf);
	  }
	return toktab->token;
      }

  switch (c) {
  case 0:
    return 0;
    
  case ' ':
  case '\t':
  case '\r':
  case '\n':
    lexptr++;
    goto retry;
    
  case 'L':
    /* Capital L may start a wide-string or wide-character constant.  */
    if (lexptr[1] == '\'')
      {
	lexptr++;
	wide_flag = 1;
	goto char_constant;
      }
    if (lexptr[1] == '"')
      {
	lexptr++;
	wide_flag = 1;
	goto string_constant;
      }
    break;

  case '\'':
    wide_flag = 0;
  char_constant:
    lexptr++;
    if (keyword_parsing) {
      char *start_ptr = lexptr - 1;
      while (1) {
	c = *lexptr++;
	if (c == '\\')
	  c = parse_escape (&lexptr);
	else if (c == '\'')
	  break;
      }
      yylval.name.address = tokstart;
      yylval.name.length = lexptr - start_ptr;
      return NAME;
    }

    /* This code for reading a character constant
       handles multicharacter constants and wide characters.
       It is mostly copied from c-lex.c.  */
    {
      register int result = 0;
      register num_chars = 0;
      unsigned width = MAX_CHAR_TYPE_SIZE;
      int max_chars;
      char *token_buffer;

      if (wide_flag)
	{
	  width = MAX_WCHAR_TYPE_SIZE;
#ifdef MULTIBYTE_CHARS
	  max_chars = MB_CUR_MAX;
#else
	  max_chars = 1;
#endif
	}
      else
	max_chars = MAX_LONG_TYPE_SIZE / width;

      token_buffer = (char *) alloca (max_chars + 1);

      while (1)
	{
	  c = *lexptr++;

	  if (c == '\'' || c == EOF)
	    break;

	  if (c == '\\')
	    {
	      c = parse_escape (&lexptr);
	      if (width < HOST_BITS_PER_INT
		  && (unsigned) c >= (1 << width))
		pedwarn ("escape sequence out of range for character");
	    }

	  num_chars++;

	  /* Merge character into result; ignore excess chars.  */
	  if (num_chars < max_chars + 1)
	    {
	      if (width < HOST_BITS_PER_INT)
		result = (result << width) | (c & ((1 << width) - 1));
	      else
		result = c;
	      token_buffer[num_chars - 1] = c;
	    }
	}

      token_buffer[num_chars] = 0;

      if (c != '\'')
	error ("malformatted character constant");
      else if (num_chars == 0)
	error ("empty character constant");
      else if (num_chars > max_chars)
	{
	  num_chars = max_chars;
	  error ("character constant too long");
	}
      else if (num_chars != 1 && ! traditional)
	warning ("multi-character character constant");

      /* If char type is signed, sign-extend the constant.  */
      if (! wide_flag)
	{
	  int num_bits = num_chars * width;

	  if (lookup ("__CHAR_UNSIGNED__", sizeof ("__CHAR_UNSIGNED__")-1, -1)
	      || ((result >> (num_bits - 1)) & 1) == 0)
	    yylval.integer.value
	      = result & ((unsigned long) ~0 >> (HOST_BITS_PER_LONG - num_bits));
	  else
	    yylval.integer.value
	      = result | ~((unsigned long) ~0 >> (HOST_BITS_PER_LONG - num_bits));
	}
      else
	{
#ifdef MULTIBYTE_CHARS
	  /* Set the initial shift state and convert the next sequence.  */
	  result = 0;
	  /* In all locales L'\0' is zero and mbtowc will return zero,
	     so don't use it.  */
	  if (num_chars > 1
	      || (num_chars == 1 && token_buffer[0] != '\0'))
	    {
	      wchar_t wc;
	      (void) mbtowc (NULL_PTR, NULL_PTR, 0);
	      if (mbtowc (& wc, token_buffer, num_chars) == num_chars)
		result = wc;
	      else
		warning ("Ignoring invalid multibyte character");
	    }
#endif
	  yylval.integer.value = result;
	}
    }

    /* This is always a signed type.  */
    yylval.integer.unsignedp = 0;
    
    return CHAR;

    /* some of these chars are invalid in constant expressions;
       maybe do something about them later */
  case '/':
  case '+':
  case '-':
  case '*':
  case '%':
  case '|':
  case '&':
  case '^':
  case '~':
  case '!':
  case '@':
  case '<':
  case '>':
  case '[':
  case ']':
  case '.':
  case '?':
  case ':':
  case '=':
  case '{':
  case '}':
  case ',':
  case '#':
    if (keyword_parsing)
      break;
  case '(':
  case ')':
    lexptr++;
    return c;

  case '"':
  string_constant:
    if (keyword_parsing) {
      char *start_ptr = lexptr;
      lexptr++;
      while (1) {
	c = *lexptr++;
	if (c == '\\')
	  c = parse_escape (&lexptr);
	else if (c == '"')
	  break;
      }
      yylval.name.address = tokstart;
      yylval.name.length = lexptr - start_ptr;
      return NAME;
    }
    yyerror ("string constants not allowed in #if expressions");
    return ERROR;
  }

  if (c >= '0' && c <= '9' && !keyword_parsing) {
    /* It's a number */
    for (namelen = 0;
	 c = tokstart[namelen], is_idchar[c] || c == '.'; 
	 namelen++)
      ;
    return parse_number (namelen);
  }

  /* It is a name.  See how long it is.  */

  if (keyword_parsing) {
    for (namelen = 0;; namelen++) {
      if (is_hor_space[tokstart[namelen]])
	break;
      if (tokstart[namelen] == '(' || tokstart[namelen] == ')')
	break;
      if (tokstart[namelen] == '"' || tokstart[namelen] == '\'')
	break;
    }
  } else {
    if (!is_idstart[c]) {
      yyerror ("Invalid token in expression");
      return ERROR;
    }

    for (namelen = 0; is_idchar[tokstart[namelen]]; namelen++)
      ;
  }
  
  lexptr += namelen;
  yylval.name.address = tokstart;
  yylval.name.length = namelen;
  return NAME;
}


/* Parse a C escape sequence.  STRING_PTR points to a variable
   containing a pointer to the string to parse.  That pointer
   is updated past the characters we use.  The value of the
   escape sequence is returned.

   A negative value means the sequence \ newline was seen,
   which is supposed to be equivalent to nothing at all.

   If \ is followed by a null character, we return a negative
   value and leave the string pointer pointing at the null character.

   If \ is followed by 000, we return 0 and leave the string pointer
   after the zeros.  A value of 0 does not mean end of string.  */

int
parse_escape (string_ptr)
     char **string_ptr;
{
  register int c = *(*string_ptr)++;
  switch (c)
    {
    case 'a':
      return TARGET_BELL;
    case 'b':
      return TARGET_BS;
    case 'e':
    case 'E':
      if (pedantic)
	pedwarn ("non-ANSI-standard escape sequence, `\\%c'", c);
      return 033;
    case 'f':
      return TARGET_FF;
    case 'n':
      return TARGET_NEWLINE;
    case 'r':
      return TARGET_CR;
    case 't':
      return TARGET_TAB;
    case 'v':
      return TARGET_VT;
    case '\n':
      return -2;
    case 0:
      (*string_ptr)--;
      return 0;
      
    case '0':
    case '1':
    case '2':
    case '3':
    case '4':
    case '5':
    case '6':
    case '7':
      {
	register int i = c - '0';
	register int count = 0;
	while (++count < 3)
	  {
	    c = *(*string_ptr)++;
	    if (c >= '0' && c <= '7')
	      i = (i << 3) + c - '0';
	    else
	      {
		(*string_ptr)--;
		break;
	      }
	  }
	if ((i & ~((1 << MAX_CHAR_TYPE_SIZE) - 1)) != 0)
	  {
	    i &= (1 << MAX_CHAR_TYPE_SIZE) - 1;
	    warning ("octal character constant does not fit in a byte");
	  }
	return i;
      }
    case 'x':
      {
	register unsigned i = 0, overflow = 0, digits_found = 0, digit;
	for (;;)
	  {
	    c = *(*string_ptr)++;
	    if (c >= '0' && c <= '9')
	      digit = c - '0';
	    else if (c >= 'a' && c <= 'f')
	      digit = c - 'a' + 10;
	    else if (c >= 'A' && c <= 'F')
	      digit = c - 'A' + 10;
	    else
	      {
		(*string_ptr)--;
		break;
	      }
	    overflow |= i ^ (i << 4 >> 4);
	    i = (i << 4) + digit;
	    digits_found = 1;
	  }
	if (!digits_found)
	  yyerror ("\\x used with no following hex digits");
	if (overflow | (i & ~((1 << BITS_PER_UNIT) - 1)))
	  {
	    i &= (1 << BITS_PER_UNIT) - 1;
	    warning ("hex character constant does not fit in a byte");
	  }
	return i;
      }
    default:
      return c;
    }
}

void
yyerror (s)
     char *s;
{
  error (s);
  longjmp (parse_return_error, 1);
}

static void
integer_overflow ()
{
  if (pedantic)
    pedwarn ("integer overflow in preprocessor expression");
}

static long
left_shift (a, b)
     struct constant *a;
     unsigned long b;
{
  if (b >= HOST_BITS_PER_LONG)
    {
      if (! a->unsignedp && a->value != 0)
	integer_overflow ();
      return 0;
    }
  else if (a->unsignedp)
    return (unsigned long) a->value << b;
  else
    {
      long l = a->value << b;
      if (l >> b != a->value)
	integer_overflow ();
      return l;
    }
}

static long
right_shift (a, b)
     struct constant *a;
     unsigned long b;
{
  if (b >= HOST_BITS_PER_LONG)
    return a->unsignedp ? 0 : a->value >> (HOST_BITS_PER_LONG - 1);
  else if (a->unsignedp)
    return (unsigned long) a->value >> b;
  else
    return a->value >> b;
}

/* This page contains the entry point to this file.  */

/* Parse STRING as an expression, and complain if this fails
   to use up all of the contents of STRING.  */
/* We do not support C comments.  They should be removed before
   this function is called.  */

HOST_WIDE_INT
parse_c_expression (string)
     char *string;
{
  lexptr = string;
  
  if (lexptr == 0 || *lexptr == 0) {
    error ("empty #if expression");
    return 0;			/* don't include the #if group */
  }

  /* if there is some sort of scanning error, just return 0 and assume
     the parsing routine has printed an error message somewhere.
     there is surely a better thing to do than this.     */
  if (setjmp (parse_return_error))
    return 0;

  if (yyparse ())
    return 0;			/* actually this is never reached
				   the way things stand. */
  if (*lexptr)
    error ("Junk after end of expression.");

  return expression_value;	/* set by yyparse () */
}

#ifdef TEST_EXP_READER
extern int yydebug;

/* Main program for testing purposes.  */
int
main ()
{
  int n, c;
  char buf[1024];

/*
  yydebug = 1;
*/
  initialize_random_junk ();

  for (;;) {
    printf ("enter expression: ");
    n = 0;
    while ((buf[n] = getchar ()) != '\n' && buf[n] != EOF)
      n++;
    if (buf[n] == EOF)
      break;
    buf[n] = '\0';
    printf ("parser returned %ld\n", parse_c_expression (buf));
  }

  return 0;
}

/* table to tell if char can be part of a C identifier. */
unsigned char is_idchar[256];
/* table to tell if char can be first char of a c identifier. */
unsigned char is_idstart[256];
/* table to tell if c is horizontal space.  isspace () thinks that
   newline is space; this is not a good idea for this program. */
char is_hor_space[256];

/*
 * initialize random junk in the hash table and maybe other places
 */
initialize_random_junk ()
{
  register int i;

  /*
   * Set up is_idchar and is_idstart tables.  These should be
   * faster than saying (is_alpha (c) || c == '_'), etc.
   * Must do set up these things before calling any routines tthat
   * refer to them.
   */
  for (i = 'a'; i <= 'z'; i++) {
    ++is_idchar[i - 'a' + 'A'];
    ++is_idchar[i];
    ++is_idstart[i - 'a' + 'A'];
    ++is_idstart[i];
  }
  for (i = '0'; i <= '9'; i++)
    ++is_idchar[i];
  ++is_idchar['_'];
  ++is_idstart['_'];
#if DOLLARS_IN_IDENTIFIERS
  ++is_idchar['$'];
  ++is_idstart['$'];
#endif

  /* horizontal space table */
  ++is_hor_space[' '];
  ++is_hor_space['\t'];
}

error (msg)
{
  printf ("error: %s\n", msg);
}

warning (msg)
{
  printf ("warning: %s\n", msg);
}

struct hashnode *
lookup (name, len, hash)
     char *name;
     int len;
     int hash;
{
  return (DEFAULT_SIGNED_CHAR) ? 0 : ((struct hashnode *) -1);
}
#endif