Source

asterisk / ast_expr2.c

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/* A Bison parser, made by GNU Bison 2.0.  */

/* Skeleton parser for Yacc-like parsing with Bison,
   Copyright (C) 1984, 1989, 1990, 2000, 2001, 2002, 2003, 2004 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 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, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

/* As a special exception, when this file is copied by Bison into a
   Bison output file, you may use that output file without restriction.
   This special exception was added by the Free Software Foundation
   in version 1.24 of Bison.  */

/* Written by Richard Stallman by simplifying the original so called
   ``semantic'' parser.  */

/* All symbols defined below should begin with yy or YY, to avoid
   infringing on user name space.  This should be done even for local
   variables, as they might otherwise be expanded by user macros.
   There are some unavoidable exceptions within include files to
   define necessary library symbols; they are noted "INFRINGES ON
   USER NAME SPACE" below.  */

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

/* Skeleton name.  */
#define YYSKELETON_NAME "yacc.c"

/* Pure parsers.  */
#define YYPURE 1

/* Using locations.  */
#define YYLSP_NEEDED 1

/* Substitute the variable and function names.  */
#define yyparse ast_yyparse
#define yylex   ast_yylex
#define yyerror ast_yyerror
#define yylval  ast_yylval
#define yychar  ast_yychar
#define yydebug ast_yydebug
#define yynerrs ast_yynerrs
#define yylloc ast_yylloc

/* Tokens.  */
#ifndef YYTOKENTYPE
# define YYTOKENTYPE
   /* Put the tokens into the symbol table, so that GDB and other debuggers
      know about them.  */
   enum yytokentype {
     TOK_COLONCOLON = 258,
     TOK_COND = 259,
     TOK_OR = 260,
     TOK_AND = 261,
     TOK_NE = 262,
     TOK_LE = 263,
     TOK_GE = 264,
     TOK_LT = 265,
     TOK_GT = 266,
     TOK_EQ = 267,
     TOK_MINUS = 268,
     TOK_PLUS = 269,
     TOK_MOD = 270,
     TOK_DIV = 271,
     TOK_MULT = 272,
     TOK_COMPL = 273,
     TOK_EQTILDE = 274,
     TOK_COLON = 275,
     TOK_LP = 276,
     TOK_RP = 277,
     TOKEN = 278
   };
#endif
#define TOK_COLONCOLON 258
#define TOK_COND 259
#define TOK_OR 260
#define TOK_AND 261
#define TOK_NE 262
#define TOK_LE 263
#define TOK_GE 264
#define TOK_LT 265
#define TOK_GT 266
#define TOK_EQ 267
#define TOK_MINUS 268
#define TOK_PLUS 269
#define TOK_MOD 270
#define TOK_DIV 271
#define TOK_MULT 272
#define TOK_COMPL 273
#define TOK_EQTILDE 274
#define TOK_COLON 275
#define TOK_LP 276
#define TOK_RP 277
#define TOKEN 278




/* Copy the first part of user declarations.  */
#line 1 "ast_expr2.y"

/* Written by Pace Willisson (pace@blitz.com) 
 * and placed in the public domain.
 *
 * Largely rewritten by J.T. Conklin (jtc@wimsey.com)
 *
 * And then overhauled twice by Steve Murphy (murf@e-tools.com)
 * to add double-quoted strings, allow mult. spaces, improve
 * error messages, and then to fold in a flex scanner for the 
 * yylex operation.
 *
 * $FreeBSD: src/bin/expr/expr.y,v 1.16 2000/07/22 10:59:36 se Exp $
 */

#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <locale.h>
#include <ctype.h>
#if !defined(SOLARIS) && !defined(__CYGWIN__)
#include <err.h>
#else
#define quad_t int64_t
#endif
#include <errno.h>
#include <regex.h>
#include <limits.h>
#include <asterisk/ast_expr.h>
#include <asterisk/logger.h>

#if defined(LONG_LONG_MIN) && !defined(QUAD_MIN)
#define QUAD_MIN LONG_LONG_MIN
#endif
#if defined(LONG_LONG_MAX) && !defined(QUAD_MAX)
#define QUAD_MAX LONG_LONG_MAX
#endif

#  if ! defined(QUAD_MIN)
#   define QUAD_MIN     (-0x7fffffffffffffffLL-1)
#  endif
#  if ! defined(QUAD_MAX)
#   define QUAD_MAX     (0x7fffffffffffffffLL)
#  endif

#define YYPARSE_PARAM parseio
#define YYLEX_PARAM ((struct parse_io *)parseio)->scanner
#define YYERROR_VERBOSE 1

enum valtype {
	AST_EXPR_integer, AST_EXPR_numeric_string, AST_EXPR_string
} ;

#ifdef STANDALONE
void ast_log(int level, const char *file, int line, const char *function, const char *fmt, ...) __attribute__ ((format (printf,5,6)));
#endif

struct val {
	enum valtype type;
	union {
		char *s;
		quad_t i;
	} u;
} ;

typedef void *yyscan_t;

struct parse_io
{
	char *string;
	struct val *val;
	yyscan_t scanner;
};
 
static int		chk_div __P((quad_t, quad_t));
static int		chk_minus __P((quad_t, quad_t, quad_t));
static int		chk_plus __P((quad_t, quad_t, quad_t));
static int		chk_times __P((quad_t, quad_t, quad_t));
static void		free_value __P((struct val *));
static int		is_zero_or_null __P((struct val *));
static int		isstring __P((struct val *));
static struct val	*make_integer __P((quad_t));
static struct val	*make_str __P((const char *));
static struct val	*op_and __P((struct val *, struct val *));
static struct val	*op_colon __P((struct val *, struct val *));
static struct val	*op_eqtilde __P((struct val *, struct val *));
static struct val	*op_div __P((struct val *, struct val *));
static struct val	*op_eq __P((struct val *, struct val *));
static struct val	*op_ge __P((struct val *, struct val *));
static struct val	*op_gt __P((struct val *, struct val *));
static struct val	*op_le __P((struct val *, struct val *));
static struct val	*op_lt __P((struct val *, struct val *));
static struct val	*op_cond __P((struct val *, struct val *, struct val *));
static struct val	*op_minus __P((struct val *, struct val *));
static struct val	*op_negate __P((struct val *));
static struct val	*op_compl __P((struct val *));
static struct val	*op_ne __P((struct val *, struct val *));
static struct val	*op_or __P((struct val *, struct val *));
static struct val	*op_plus __P((struct val *, struct val *));
static struct val	*op_rem __P((struct val *, struct val *));
static struct val	*op_times __P((struct val *, struct val *));
static quad_t		to_integer __P((struct val *));
static void		to_string __P((struct val *));

/* uh, if I want to predeclare yylex with a YYLTYPE, I have to predeclare the yyltype... sigh */
typedef struct yyltype
{
  int first_line;
  int first_column;

  int last_line;
  int last_column;
} yyltype;

# define YYLTYPE yyltype
# define YYLTYPE_IS_TRIVIAL 1

/* we will get warning about no prototype for yylex! But we can't
   define it here, we have no definition yet for YYSTYPE. */

int		ast_yyerror(const char *,YYLTYPE *, struct parse_io *);
 
/* I wanted to add args to the yyerror routine, so I could print out
   some useful info about the error. Not as easy as it looks, but it
   is possible. */
#define ast_yyerror(x) ast_yyerror(x,&yyloc,parseio)
#define DESTROY(x) { \
if ((x)->type == AST_EXPR_numeric_string || (x)->type == AST_EXPR_string) \
	free((x)->u.s); \
	(x)->u.s = 0; \
	free(x); \
}


/* Enabling traces.  */
#ifndef YYDEBUG
# define YYDEBUG 0
#endif

/* Enabling verbose error messages.  */
#ifdef YYERROR_VERBOSE
# undef YYERROR_VERBOSE
# define YYERROR_VERBOSE 1
#else
# define YYERROR_VERBOSE 0
#endif

#if ! defined (YYSTYPE) && ! defined (YYSTYPE_IS_DECLARED)
#line 142 "ast_expr2.y"
typedef union YYSTYPE {
	struct val *val;
} YYSTYPE;
/* Line 190 of yacc.c.  */
#line 268 "ast_expr2.c"
# define yystype YYSTYPE /* obsolescent; will be withdrawn */
# define YYSTYPE_IS_DECLARED 1
# define YYSTYPE_IS_TRIVIAL 1
#endif

#if ! defined (YYLTYPE) && ! defined (YYLTYPE_IS_DECLARED)
typedef struct YYLTYPE
{
  int first_line;
  int first_column;
  int last_line;
  int last_column;
} YYLTYPE;
# define yyltype YYLTYPE /* obsolescent; will be withdrawn */
# define YYLTYPE_IS_DECLARED 1
# define YYLTYPE_IS_TRIVIAL 1
#endif


/* Copy the second part of user declarations.  */
#line 146 "ast_expr2.y"

extern int		ast_yylex __P((YYSTYPE *, YYLTYPE *, yyscan_t));


/* Line 213 of yacc.c.  */
#line 295 "ast_expr2.c"

#if ! defined (yyoverflow) || YYERROR_VERBOSE

# ifndef YYFREE
#  define YYFREE free
# endif
# ifndef YYMALLOC
#  define YYMALLOC malloc
# endif

/* The parser invokes alloca or malloc; define the necessary symbols.  */

# ifdef YYSTACK_USE_ALLOCA
#  if YYSTACK_USE_ALLOCA
#   ifdef __GNUC__
#    define YYSTACK_ALLOC __builtin_alloca
#   else
#    define YYSTACK_ALLOC alloca
#   endif
#  endif
# endif

# ifdef YYSTACK_ALLOC
   /* Pacify GCC's `empty if-body' warning. */
#  define YYSTACK_FREE(Ptr) do { /* empty */; } while (0)
# else
#  if defined (__STDC__) || defined (__cplusplus)
#   include <stdlib.h> /* INFRINGES ON USER NAME SPACE */
#   define YYSIZE_T size_t
#  endif
#  define YYSTACK_ALLOC YYMALLOC
#  define YYSTACK_FREE YYFREE
# endif
#endif /* ! defined (yyoverflow) || YYERROR_VERBOSE */


#if (! defined (yyoverflow) \
     && (! defined (__cplusplus) \
	 || (defined (YYLTYPE_IS_TRIVIAL) && YYLTYPE_IS_TRIVIAL \
             && defined (YYSTYPE_IS_TRIVIAL) && YYSTYPE_IS_TRIVIAL)))

/* A type that is properly aligned for any stack member.  */
union yyalloc
{
  short int yyss;
  YYSTYPE yyvs;
    YYLTYPE yyls;
};

/* The size of the maximum gap between one aligned stack and the next.  */
# define YYSTACK_GAP_MAXIMUM (sizeof (union yyalloc) - 1)

/* The size of an array large to enough to hold all stacks, each with
   N elements.  */
# define YYSTACK_BYTES(N) \
     ((N) * (sizeof (short int) + sizeof (YYSTYPE) + sizeof (YYLTYPE))	\
      + 2 * YYSTACK_GAP_MAXIMUM)

/* Copy COUNT objects from FROM to TO.  The source and destination do
   not overlap.  */
# ifndef YYCOPY
#  if defined (__GNUC__) && 1 < __GNUC__
#   define YYCOPY(To, From, Count) \
      __builtin_memcpy (To, From, (Count) * sizeof (*(From)))
#  else
#   define YYCOPY(To, From, Count)		\
      do					\
	{					\
	  register YYSIZE_T yyi;		\
	  for (yyi = 0; yyi < (Count); yyi++)	\
	    (To)[yyi] = (From)[yyi];		\
	}					\
      while (0)
#  endif
# endif

/* Relocate STACK from its old location to the new one.  The
   local variables YYSIZE and YYSTACKSIZE give the old and new number of
   elements in the stack, and YYPTR gives the new location of the
   stack.  Advance YYPTR to a properly aligned location for the next
   stack.  */
# define YYSTACK_RELOCATE(Stack)					\
    do									\
      {									\
	YYSIZE_T yynewbytes;						\
	YYCOPY (&yyptr->Stack, Stack, yysize);				\
	Stack = &yyptr->Stack;						\
	yynewbytes = yystacksize * sizeof (*Stack) + YYSTACK_GAP_MAXIMUM; \
	yyptr += yynewbytes / sizeof (*yyptr);				\
      }									\
    while (0)

#endif

#if defined (__STDC__) || defined (__cplusplus)
   typedef signed char yysigned_char;
#else
   typedef short int yysigned_char;
#endif

/* YYFINAL -- State number of the termination state. */
#define YYFINAL  10
/* YYLAST -- Last index in YYTABLE.  */
#define YYLAST   140

/* YYNTOKENS -- Number of terminals. */
#define YYNTOKENS  24
/* YYNNTS -- Number of nonterminals. */
#define YYNNTS  3
/* YYNRULES -- Number of rules. */
#define YYNRULES  22
/* YYNRULES -- Number of states. */
#define YYNSTATES  46

/* YYTRANSLATE(YYLEX) -- Bison symbol number corresponding to YYLEX.  */
#define YYUNDEFTOK  2
#define YYMAXUTOK   278

#define YYTRANSLATE(YYX) 						\
  ((unsigned int) (YYX) <= YYMAXUTOK ? yytranslate[YYX] : YYUNDEFTOK)

/* YYTRANSLATE[YYLEX] -- Bison symbol number corresponding to YYLEX.  */
static const unsigned 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,     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,     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,     7,     8,     9,    10,    11,    12,    13,    14,
      15,    16,    17,    18,    19,    20,    21,    22,    23
};

#if YYDEBUG
/* YYPRHS[YYN] -- Index of the first RHS symbol of rule number YYN in
   YYRHS.  */
static const unsigned char yyprhs[] =
{
       0,     0,     3,     5,     7,    11,    15,    19,    23,    27,
      31,    35,    39,    43,    47,    51,    54,    57,    61,    65,
      69,    73,    77
};

/* YYRHS -- A `-1'-separated list of the rules' RHS. */
static const yysigned_char yyrhs[] =
{
      25,     0,    -1,    26,    -1,    23,    -1,    21,    26,    22,
      -1,    26,     5,    26,    -1,    26,     6,    26,    -1,    26,
      12,    26,    -1,    26,    11,    26,    -1,    26,    10,    26,
      -1,    26,     9,    26,    -1,    26,     8,    26,    -1,    26,
       7,    26,    -1,    26,    14,    26,    -1,    26,    13,    26,
      -1,    13,    26,    -1,    18,    26,    -1,    26,    17,    26,
      -1,    26,    16,    26,    -1,    26,    15,    26,    -1,    26,
      20,    26,    -1,    26,    19,    26,    -1,    26,     4,    26,
       3,    26,    -1
};

/* YYRLINE[YYN] -- source line where rule number YYN was defined.  */
static const unsigned char yyrline[] =
{
       0,   165,   165,   175,   176,   180,   184,   188,   192,   196,
     200,   204,   208,   212,   216,   220,   224,   228,   232,   236,
     240,   244,   248
};
#endif

#if YYDEBUG || YYERROR_VERBOSE
/* YYTNME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
   First, the terminals, then, starting at YYNTOKENS, nonterminals. */
static const char *const yytname[] =
{
  "$end", "error", "$undefined", "TOK_COLONCOLON", "TOK_COND", "TOK_OR",
  "TOK_AND", "TOK_NE", "TOK_LE", "TOK_GE", "TOK_LT", "TOK_GT", "TOK_EQ",
  "TOK_MINUS", "TOK_PLUS", "TOK_MOD", "TOK_DIV", "TOK_MULT", "TOK_COMPL",
  "TOK_EQTILDE", "TOK_COLON", "TOK_LP", "TOK_RP", "TOKEN", "$accept",
  "start", "expr", 0
};
#endif

# ifdef YYPRINT
/* YYTOKNUM[YYLEX-NUM] -- Internal token number corresponding to
   token YYLEX-NUM.  */
static const unsigned short int yytoknum[] =
{
       0,   256,   257,   258,   259,   260,   261,   262,   263,   264,
     265,   266,   267,   268,   269,   270,   271,   272,   273,   274,
     275,   276,   277,   278
};
# endif

/* YYR1[YYN] -- Symbol number of symbol that rule YYN derives.  */
static const unsigned char yyr1[] =
{
       0,    24,    25,    26,    26,    26,    26,    26,    26,    26,
      26,    26,    26,    26,    26,    26,    26,    26,    26,    26,
      26,    26,    26
};

/* YYR2[YYN] -- Number of symbols composing right hand side of rule YYN.  */
static const unsigned char yyr2[] =
{
       0,     2,     1,     1,     3,     3,     3,     3,     3,     3,
       3,     3,     3,     3,     3,     2,     2,     3,     3,     3,
       3,     3,     5
};

/* YYDEFACT[STATE-NAME] -- Default rule to reduce with in state
   STATE-NUM when YYTABLE doesn't specify something else to do.  Zero
   means the default is an error.  */
static const unsigned char yydefact[] =
{
       0,     0,     0,     0,     3,     0,     2,    15,    16,     0,
       1,     0,     0,     0,     0,     0,     0,     0,     0,     0,
       0,     0,     0,     0,     0,     0,     0,     4,     0,     5,
       6,    12,    11,    10,     9,     8,     7,    14,    13,    19,
      18,    17,    21,    20,     0,    22
};

/* YYDEFGOTO[NTERM-NUM]. */
static const yysigned_char yydefgoto[] =
{
      -1,     5,     6
};

/* YYPACT[STATE-NUM] -- Index in YYTABLE of the portion describing
   STATE-NUM.  */
#define YYPACT_NINF -13
static const yysigned_char yypact[] =
{
     109,   109,   109,   109,   -13,     6,    59,   106,   106,    22,
     -13,   109,   109,   109,   109,   109,   109,   109,   109,   109,
     109,   109,   109,   109,   109,   109,   109,   -13,    42,    90,
     104,   120,   120,   120,   120,   120,   120,   -12,   -12,   106,
     106,   106,   -13,   -13,   109,    75
};

/* YYPGOTO[NTERM-NUM].  */
static const yysigned_char yypgoto[] =
{
     -13,   -13,    -1
};

/* YYTABLE[YYPACT[STATE-NUM]].  What to do in state STATE-NUM.  If
   positive, shift that token.  If negative, reduce the rule which
   number is the opposite.  If zero, do what YYDEFACT says.
   If YYTABLE_NINF, syntax error.  */
#define YYTABLE_NINF -1
static const unsigned char yytable[] =
{
       7,     8,     9,    22,    23,    24,    10,    25,    26,     0,
      28,    29,    30,    31,    32,    33,    34,    35,    36,    37,
      38,    39,    40,    41,    42,    43,    11,    12,    13,    14,
      15,    16,    17,    18,    19,    20,    21,    22,    23,    24,
       0,    25,    26,    45,    27,    44,    11,    12,    13,    14,
      15,    16,    17,    18,    19,    20,    21,    22,    23,    24,
       0,    25,    26,    11,    12,    13,    14,    15,    16,    17,
      18,    19,    20,    21,    22,    23,    24,     0,    25,    26,
      12,    13,    14,    15,    16,    17,    18,    19,    20,    21,
      22,    23,    24,     0,    25,    26,    13,    14,    15,    16,
      17,    18,    19,    20,    21,    22,    23,    24,     0,    25,
      26,    14,    15,    16,    17,    18,    19,    20,    21,    22,
      23,    24,     1,    25,    26,    25,    26,     2,     0,     0,
       3,     0,     4,    20,    21,    22,    23,    24,     0,    25,
      26
};

static const yysigned_char yycheck[] =
{
       1,     2,     3,    15,    16,    17,     0,    19,    20,    -1,
      11,    12,    13,    14,    15,    16,    17,    18,    19,    20,
      21,    22,    23,    24,    25,    26,     4,     5,     6,     7,
       8,     9,    10,    11,    12,    13,    14,    15,    16,    17,
      -1,    19,    20,    44,    22,     3,     4,     5,     6,     7,
       8,     9,    10,    11,    12,    13,    14,    15,    16,    17,
      -1,    19,    20,     4,     5,     6,     7,     8,     9,    10,
      11,    12,    13,    14,    15,    16,    17,    -1,    19,    20,
       5,     6,     7,     8,     9,    10,    11,    12,    13,    14,
      15,    16,    17,    -1,    19,    20,     6,     7,     8,     9,
      10,    11,    12,    13,    14,    15,    16,    17,    -1,    19,
      20,     7,     8,     9,    10,    11,    12,    13,    14,    15,
      16,    17,    13,    19,    20,    19,    20,    18,    -1,    -1,
      21,    -1,    23,    13,    14,    15,    16,    17,    -1,    19,
      20
};

/* YYSTOS[STATE-NUM] -- The (internal number of the) accessing
   symbol of state STATE-NUM.  */
static const unsigned char yystos[] =
{
       0,    13,    18,    21,    23,    25,    26,    26,    26,    26,
       0,     4,     5,     6,     7,     8,     9,    10,    11,    12,
      13,    14,    15,    16,    17,    19,    20,    22,    26,    26,
      26,    26,    26,    26,    26,    26,    26,    26,    26,    26,
      26,    26,    26,    26,     3,    26
};

#if ! defined (YYSIZE_T) && defined (__SIZE_TYPE__)
# define YYSIZE_T __SIZE_TYPE__
#endif
#if ! defined (YYSIZE_T) && defined (size_t)
# define YYSIZE_T size_t
#endif
#if ! defined (YYSIZE_T)
# if defined (__STDC__) || defined (__cplusplus)
#  include <stddef.h> /* INFRINGES ON USER NAME SPACE */
#  define YYSIZE_T size_t
# endif
#endif
#if ! defined (YYSIZE_T)
# define YYSIZE_T unsigned int
#endif

#define yyerrok		(yyerrstatus = 0)
#define yyclearin	(yychar = YYEMPTY)
#define YYEMPTY		(-2)
#define YYEOF		0

#define YYACCEPT	goto yyacceptlab
#define YYABORT		goto yyabortlab
#define YYERROR		goto yyerrorlab


/* 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);						\
      yytoken = YYTRANSLATE (yychar);				\
      YYPOPSTACK;						\
      goto yybackup;						\
    }								\
  else								\
    { 								\
      yyerror ("syntax error: cannot back up");\
      YYERROR;							\
    }								\
while (0)


#define YYTERROR	1
#define YYERRCODE	256


/* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N].
   If N is 0, then set CURRENT to the empty location which ends
   the previous symbol: RHS[0] (always defined).  */

#define YYRHSLOC(Rhs, K) ((Rhs)[K])
#ifndef YYLLOC_DEFAULT
# define YYLLOC_DEFAULT(Current, Rhs, N)				\
    do									\
      if (N)								\
	{								\
	  (Current).first_line   = YYRHSLOC (Rhs, 1).first_line;	\
	  (Current).first_column = YYRHSLOC (Rhs, 1).first_column;	\
	  (Current).last_line    = YYRHSLOC (Rhs, N).last_line;		\
	  (Current).last_column  = YYRHSLOC (Rhs, N).last_column;	\
	}								\
      else								\
	{								\
	  (Current).first_line   = (Current).last_line   =		\
	    YYRHSLOC (Rhs, 0).last_line;				\
	  (Current).first_column = (Current).last_column =		\
	    YYRHSLOC (Rhs, 0).last_column;				\
	}								\
    while (0)
#endif


/* YY_LOCATION_PRINT -- Print the location on the stream.
   This macro was not mandated originally: define only if we know
   we won't break user code: when these are the locations we know.  */

#ifndef YY_LOCATION_PRINT
# if YYLTYPE_IS_TRIVIAL
#  define YY_LOCATION_PRINT(File, Loc)			\
     fprintf (File, "%d.%d-%d.%d",			\
              (Loc).first_line, (Loc).first_column,	\
              (Loc).last_line,  (Loc).last_column)
# else
#  define YY_LOCATION_PRINT(File, Loc) ((void) 0)
# endif
#endif


/* YYLEX -- calling `yylex' with the right arguments.  */

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

/* Enable debugging if requested.  */
#if YYDEBUG

# ifndef YYFPRINTF
#  include <stdio.h> /* INFRINGES ON USER NAME SPACE */
#  define YYFPRINTF fprintf
# endif

# define YYDPRINTF(Args)			\
do {						\
  if (yydebug)					\
    YYFPRINTF Args;				\
} while (0)

# define YY_SYMBOL_PRINT(Title, Type, Value, Location)		\
do {								\
  if (yydebug)							\
    {								\
      YYFPRINTF (stderr, "%s ", Title);				\
      yysymprint (stderr, 					\
                  Type, Value, Location);	\
      YYFPRINTF (stderr, "\n");					\
    }								\
} while (0)

/*------------------------------------------------------------------.
| yy_stack_print -- Print the state stack from its BOTTOM up to its |
| TOP (included).                                                   |
`------------------------------------------------------------------*/

#if defined (__STDC__) || defined (__cplusplus)
static void
yy_stack_print (short int *bottom, short int *top)
#else
static void
yy_stack_print (bottom, top)
    short int *bottom;
    short int *top;
#endif
{
  YYFPRINTF (stderr, "Stack now");
  for (/* Nothing. */; bottom <= top; ++bottom)
    YYFPRINTF (stderr, " %d", *bottom);
  YYFPRINTF (stderr, "\n");
}

# define YY_STACK_PRINT(Bottom, Top)				\
do {								\
  if (yydebug)							\
    yy_stack_print ((Bottom), (Top));				\
} while (0)


/*------------------------------------------------.
| Report that the YYRULE is going to be reduced.  |
`------------------------------------------------*/

#if defined (__STDC__) || defined (__cplusplus)
static void
yy_reduce_print (int yyrule)
#else
static void
yy_reduce_print (yyrule)
    int yyrule;
#endif
{
  int yyi;
  unsigned int yylno = yyrline[yyrule];
  YYFPRINTF (stderr, "Reducing stack by rule %d (line %u), ",
             yyrule - 1, yylno);
  /* Print the symbols being reduced, and their result.  */
  for (yyi = yyprhs[yyrule]; 0 <= yyrhs[yyi]; yyi++)
    YYFPRINTF (stderr, "%s ", yytname [yyrhs[yyi]]);
  YYFPRINTF (stderr, "-> %s\n", yytname [yyr1[yyrule]]);
}

# define YY_REDUCE_PRINT(Rule)		\
do {					\
  if (yydebug)				\
    yy_reduce_print (Rule);		\
} while (0)

/* Nonzero means print parse trace.  It is left uninitialized so that
   multiple parsers can coexist.  */
int yydebug;
#else /* !YYDEBUG */
# define YYDPRINTF(Args)
# define YY_SYMBOL_PRINT(Title, Type, Value, Location)
# define YY_STACK_PRINT(Bottom, Top)
# define YY_REDUCE_PRINT(Rule)
#endif /* !YYDEBUG */


/* YYINITDEPTH -- initial size of the parser's stacks.  */
#ifndef	YYINITDEPTH
# define YYINITDEPTH 200
#endif

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

   Do not make this value too large; the results are undefined if
   SIZE_MAX < YYSTACK_BYTES (YYMAXDEPTH)
   evaluated with infinite-precision integer arithmetic.  */

#ifndef YYMAXDEPTH
# define YYMAXDEPTH 10000
#endif



#if YYERROR_VERBOSE

# ifndef yystrlen
#  if defined (__GLIBC__) && defined (_STRING_H)
#   define yystrlen strlen
#  else
/* Return the length of YYSTR.  */
static YYSIZE_T
#   if defined (__STDC__) || defined (__cplusplus)
yystrlen (const char *yystr)
#   else
yystrlen (yystr)
     const char *yystr;
#   endif
{
  register const char *yys = yystr;

  while (*yys++ != '\0')
    continue;

  return yys - yystr - 1;
}
#  endif
# endif

# ifndef yystpcpy
#  if defined (__GLIBC__) && defined (_STRING_H) && defined (_GNU_SOURCE)
#   define yystpcpy stpcpy
#  else
/* Copy YYSRC to YYDEST, returning the address of the terminating '\0' in
   YYDEST.  */
static char *
#   if defined (__STDC__) || defined (__cplusplus)
yystpcpy (char *yydest, const char *yysrc)
#   else
yystpcpy (yydest, yysrc)
     char *yydest;
     const char *yysrc;
#   endif
{
  register char *yyd = yydest;
  register const char *yys = yysrc;

  while ((*yyd++ = *yys++) != '\0')
    continue;

  return yyd - 1;
}
#  endif
# endif

#endif /* !YYERROR_VERBOSE */



#if YYDEBUG
/*--------------------------------.
| Print this symbol on YYOUTPUT.  |
`--------------------------------*/

#if defined (__STDC__) || defined (__cplusplus)
static void
yysymprint (FILE *yyoutput, int yytype, YYSTYPE *yyvaluep, YYLTYPE *yylocationp)
#else
static void
yysymprint (yyoutput, yytype, yyvaluep, yylocationp)
    FILE *yyoutput;
    int yytype;
    YYSTYPE *yyvaluep;
    YYLTYPE *yylocationp;
#endif
{
  /* Pacify ``unused variable'' warnings.  */
  (void) yyvaluep;
  (void) yylocationp;

  if (yytype < YYNTOKENS)
    YYFPRINTF (yyoutput, "token %s (", yytname[yytype]);
  else
    YYFPRINTF (yyoutput, "nterm %s (", yytname[yytype]);

  YY_LOCATION_PRINT (yyoutput, *yylocationp);
  fprintf (yyoutput, ": ");

# ifdef YYPRINT
  if (yytype < YYNTOKENS)
    YYPRINT (yyoutput, yytoknum[yytype], *yyvaluep);
# endif
  switch (yytype)
    {
      default:
        break;
    }
  YYFPRINTF (yyoutput, ")");
}

#endif /* ! YYDEBUG */
/*-----------------------------------------------.
| Release the memory associated to this symbol.  |
`-----------------------------------------------*/

#if defined (__STDC__) || defined (__cplusplus)
static void
yydestruct (const char *yymsg, int yytype, YYSTYPE *yyvaluep, YYLTYPE *yylocationp)
#else
static void
yydestruct (yymsg, yytype, yyvaluep, yylocationp)
    const char *yymsg;
    int yytype;
    YYSTYPE *yyvaluep;
    YYLTYPE *yylocationp;
#endif
{
  /* Pacify ``unused variable'' warnings.  */
  (void) yyvaluep;
  (void) yylocationp;

  if (!yymsg)
    yymsg = "Deleting";
  YY_SYMBOL_PRINT (yymsg, yytype, yyvaluep, yylocationp);

  switch (yytype)
    {

      default:
        break;
    }
}


/* Prevent warnings from -Wmissing-prototypes.  */

#ifdef YYPARSE_PARAM
# if defined (__STDC__) || defined (__cplusplus)
int yyparse (void *YYPARSE_PARAM);
# else
int yyparse ();
# endif
#else /* ! YYPARSE_PARAM */
#if defined (__STDC__) || defined (__cplusplus)
int yyparse (void);
#else
int yyparse ();
#endif
#endif /* ! YYPARSE_PARAM */






/*----------.
| yyparse.  |
`----------*/

#ifdef YYPARSE_PARAM
# if defined (__STDC__) || defined (__cplusplus)
int yyparse (void *YYPARSE_PARAM)
# else
int yyparse (YYPARSE_PARAM)
  void *YYPARSE_PARAM;
# endif
#else /* ! YYPARSE_PARAM */
#if defined (__STDC__) || defined (__cplusplus)
int
yyparse (void)
#else
int
yyparse ()

#endif
#endif
{
  /* The look-ahead symbol.  */
int yychar;

/* The semantic value of the look-ahead symbol.  */
YYSTYPE yylval;

/* Number of syntax errors so far.  */
int yynerrs;
/* Location data for the look-ahead symbol.  */
YYLTYPE yylloc;

  register int yystate;
  register int yyn;
  int yyresult;
  /* Number of tokens to shift before error messages enabled.  */
  int yyerrstatus;
  /* Look-ahead token as an internal (translated) token number.  */
  int yytoken = 0;

  /* Three stacks and their tools:
     `yyss': related to states,
     `yyvs': related to semantic values,
     `yyls': related to locations.

     Refer to the stacks thru separate pointers, to allow yyoverflow
     to reallocate them elsewhere.  */

  /* The state stack.  */
  short int yyssa[YYINITDEPTH];
  short int *yyss = yyssa;
  register short int *yyssp;

  /* The semantic value stack.  */
  YYSTYPE yyvsa[YYINITDEPTH];
  YYSTYPE *yyvs = yyvsa;
  register YYSTYPE *yyvsp;

  /* The location stack.  */
  YYLTYPE yylsa[YYINITDEPTH];
  YYLTYPE *yyls = yylsa;
  YYLTYPE *yylsp;
  /* The locations where the error started and ended. */
  YYLTYPE yyerror_range[2];

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

  YYSIZE_T yystacksize = YYINITDEPTH;

  /* The variables used to return semantic value and location from the
     action routines.  */
  YYSTYPE yyval;
  YYLTYPE yyloc;

  /* When reducing, the number of symbols on the RHS of the reduced
     rule.  */
  int yylen;

  YYDPRINTF ((stderr, "Starting parse\n"));

  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;
  yyvsp = yyvs;
  yylsp = yyls;
#if YYLTYPE_IS_TRIVIAL
  /* Initialize the default location before parsing starts.  */
  yylloc.first_line   = yylloc.last_line   = 1;
  yylloc.first_column = yylloc.last_column = 0;
#endif


  yyvsp[0] = yylval;
    yylsp[0] = yylloc;

  goto yysetstate;

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

 yysetstate:
  *yyssp = yystate;

  if (yyss + yystacksize - 1 <= yyssp)
    {
      /* Get the current used size of the three stacks, in elements.  */
      YYSIZE_T yysize = yyssp - yyss + 1;

#ifdef yyoverflow
      {
	/* 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 int *yyss1 = yyss;
	YYLTYPE *yyls1 = yyls;

	/* Each stack pointer address is followed by the size of the
	   data in use in that stack, in bytes.  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, yysize * sizeof (*yyssp),
		    &yyvs1, yysize * sizeof (*yyvsp),
		    &yyls1, yysize * sizeof (*yylsp),
		    &yystacksize);
	yyls = yyls1;
	yyss = yyss1;
	yyvs = yyvs1;
      }
#else /* no yyoverflow */
# ifndef YYSTACK_RELOCATE
      goto yyoverflowlab;
# else
      /* Extend the stack our own way.  */
      if (YYMAXDEPTH <= yystacksize)
	goto yyoverflowlab;
      yystacksize *= 2;
      if (YYMAXDEPTH < yystacksize)
	yystacksize = YYMAXDEPTH;

      {
	short int *yyss1 = yyss;
	union yyalloc *yyptr =
	  (union yyalloc *) YYSTACK_ALLOC (YYSTACK_BYTES (yystacksize));
	if (! yyptr)
	  goto yyoverflowlab;
	YYSTACK_RELOCATE (yyss);
	YYSTACK_RELOCATE (yyvs);
	YYSTACK_RELOCATE (yyls);
#  undef YYSTACK_RELOCATE
	if (yyss1 != yyssa)
	  YYSTACK_FREE (yyss1);
      }
# endif
#endif /* no yyoverflow */

      yyssp = yyss + yysize - 1;
      yyvsp = yyvs + yysize - 1;
      yylsp = yyls + yysize - 1;

      YYDPRINTF ((stderr, "Stack size increased to %lu\n",
		  (unsigned long int) yystacksize));

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

  YYDPRINTF ((stderr, "Entering state %d\n", yystate));

  goto yybackup;

/*-----------.
| yybackup.  |
`-----------*/
yybackup:

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

  /* First try to decide what to do without reference to look-ahead token.  */

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

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

  /* YYCHAR is either YYEMPTY or YYEOF or a valid look-ahead symbol.  */
  if (yychar == YYEMPTY)
    {
      YYDPRINTF ((stderr, "Reading a token: "));
      yychar = YYLEX;
    }

  if (yychar <= YYEOF)
    {
      yychar = yytoken = YYEOF;
      YYDPRINTF ((stderr, "Now at end of input.\n"));
    }
  else
    {
      yytoken = YYTRANSLATE (yychar);
      YY_SYMBOL_PRINT ("Next token is", yytoken, &yylval, &yylloc);
    }

  /* If the proper action on seeing token YYTOKEN is to reduce or to
     detect an error, take that action.  */
  yyn += yytoken;
  if (yyn < 0 || YYLAST < yyn || yycheck[yyn] != yytoken)
    goto yydefault;
  yyn = yytable[yyn];
  if (yyn <= 0)
    {
      if (yyn == 0 || yyn == YYTABLE_NINF)
	goto yyerrlab;
      yyn = -yyn;
      goto yyreduce;
    }

  if (yyn == YYFINAL)
    YYACCEPT;

  /* Shift the look-ahead token.  */
  YY_SYMBOL_PRINT ("Shifting", yytoken, &yylval, &yylloc);

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

  *++yyvsp = yylval;
  *++yylsp = yylloc;

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

  yystate = yyn;
  goto yynewstate;


/*-----------------------------------------------------------.
| yydefault -- do the default action for the current state.  |
`-----------------------------------------------------------*/
yydefault:
  yyn = yydefact[yystate];
  if (yyn == 0)
    goto yyerrlab;
  goto yyreduce;


/*-----------------------------.
| yyreduce -- Do a reduction.  |
`-----------------------------*/
yyreduce:
  /* yyn is the number of a rule to reduce with.  */
  yylen = yyr2[yyn];

  /* If YYLEN is nonzero, implement the default value of the action:
     `$$ = $1'.

     Otherwise, the following line sets YYVAL to garbage.
     This behavior is undocumented and Bison
     users should not rely upon it.  Assigning to YYVAL
     unconditionally makes the parser a bit smaller, and it avoids a
     GCC warning that YYVAL may be used uninitialized.  */
  yyval = yyvsp[1-yylen];

  /* Default location. */
  YYLLOC_DEFAULT (yyloc, yylsp - yylen, yylen);
  YY_REDUCE_PRINT (yyn);
  switch (yyn)
    {
        case 2:
#line 165 "ast_expr2.y"
    { ((struct parse_io *)parseio)->val = (struct val *)calloc(sizeof(struct val),1);
              ((struct parse_io *)parseio)->val->type = (yyvsp[0].val)->type;
              if( (yyvsp[0].val)->type == AST_EXPR_integer )
				  ((struct parse_io *)parseio)->val->u.i = (yyvsp[0].val)->u.i;
              else
				  ((struct parse_io *)parseio)->val->u.s = (yyvsp[0].val)->u.s; 
			  free((yyvsp[0].val));
			;}
    break;

  case 3:
#line 175 "ast_expr2.y"
    { (yyval.val)= (yyvsp[0].val);;}
    break;

  case 4:
#line 176 "ast_expr2.y"
    { (yyval.val) = (yyvsp[-1].val); 
	                       (yyloc).first_column = (yylsp[-2]).first_column; (yyloc).last_column = (yylsp[0]).last_column; 
						   (yyloc).first_line=0; (yyloc).last_line=0;
							DESTROY((yyvsp[-2].val)); DESTROY((yyvsp[0].val)); ;}
    break;

  case 5:
#line 180 "ast_expr2.y"
    { (yyval.val) = op_or ((yyvsp[-2].val), (yyvsp[0].val));
						DESTROY((yyvsp[-1].val));	
                         (yyloc).first_column = (yylsp[-2]).first_column; (yyloc).last_column = (yylsp[0]).last_column; 
						 (yyloc).first_line=0; (yyloc).last_line=0;;}
    break;

  case 6:
#line 184 "ast_expr2.y"
    { (yyval.val) = op_and ((yyvsp[-2].val), (yyvsp[0].val)); 
						DESTROY((yyvsp[-1].val));	
	                      (yyloc).first_column = (yylsp[-2]).first_column; (yyloc).last_column = (yylsp[0]).last_column; 
                          (yyloc).first_line=0; (yyloc).last_line=0;;}
    break;

  case 7:
#line 188 "ast_expr2.y"
    { (yyval.val) = op_eq ((yyvsp[-2].val), (yyvsp[0].val));
						DESTROY((yyvsp[-1].val));	
	                     (yyloc).first_column = (yylsp[-2]).first_column; (yyloc).last_column = (yylsp[0]).last_column;
						 (yyloc).first_line=0; (yyloc).last_line=0;;}
    break;

  case 8:
#line 192 "ast_expr2.y"
    { (yyval.val) = op_gt ((yyvsp[-2].val), (yyvsp[0].val));
						DESTROY((yyvsp[-1].val));	
                         (yyloc).first_column = (yylsp[-2]).first_column; (yyloc).last_column = (yylsp[0]).last_column;
						 (yyloc).first_line=0; (yyloc).last_line=0;;}
    break;

  case 9:
#line 196 "ast_expr2.y"
    { (yyval.val) = op_lt ((yyvsp[-2].val), (yyvsp[0].val)); 
						DESTROY((yyvsp[-1].val));	
	                     (yyloc).first_column = (yylsp[-2]).first_column; (yyloc).last_column = (yylsp[0]).last_column; 
						 (yyloc).first_line=0; (yyloc).last_line=0;;}
    break;

  case 10:
#line 200 "ast_expr2.y"
    { (yyval.val) = op_ge ((yyvsp[-2].val), (yyvsp[0].val)); 
						DESTROY((yyvsp[-1].val));	
	                      (yyloc).first_column = (yylsp[-2]).first_column; (yyloc).last_column = (yylsp[0]).last_column; 
						  (yyloc).first_line=0; (yyloc).last_line=0;;}
    break;

  case 11:
#line 204 "ast_expr2.y"
    { (yyval.val) = op_le ((yyvsp[-2].val), (yyvsp[0].val)); 
						DESTROY((yyvsp[-1].val));	
	                      (yyloc).first_column = (yylsp[-2]).first_column; (yyloc).last_column = (yylsp[0]).last_column; 
						  (yyloc).first_line=0; (yyloc).last_line=0;;}
    break;

  case 12:
#line 208 "ast_expr2.y"
    { (yyval.val) = op_ne ((yyvsp[-2].val), (yyvsp[0].val)); 
						DESTROY((yyvsp[-1].val));	
	                      (yyloc).first_column = (yylsp[-2]).first_column; (yyloc).last_column = (yylsp[0]).last_column; 
						  (yyloc).first_line=0; (yyloc).last_line=0;;}
    break;

  case 13:
#line 212 "ast_expr2.y"
    { (yyval.val) = op_plus ((yyvsp[-2].val), (yyvsp[0].val)); 
						DESTROY((yyvsp[-1].val));	
	                       (yyloc).first_column = (yylsp[-2]).first_column; (yyloc).last_column = (yylsp[0]).last_column; 
						   (yyloc).first_line=0; (yyloc).last_line=0;;}
    break;

  case 14:
#line 216 "ast_expr2.y"
    { (yyval.val) = op_minus ((yyvsp[-2].val), (yyvsp[0].val)); 
						DESTROY((yyvsp[-1].val));	
	                        (yyloc).first_column = (yylsp[-2]).first_column; (yyloc).last_column = (yylsp[0]).last_column; 
							(yyloc).first_line=0; (yyloc).last_line=0;;}
    break;

  case 15:
#line 220 "ast_expr2.y"
    { (yyval.val) = op_negate ((yyvsp[0].val)); 
						DESTROY((yyvsp[-1].val));	
	                        (yyloc).first_column = (yylsp[-1]).first_column; (yyloc).last_column = (yylsp[0]).last_column; 
							(yyloc).first_line=0; (yyloc).last_line=0;;}
    break;

  case 16:
#line 224 "ast_expr2.y"
    { (yyval.val) = op_compl ((yyvsp[0].val)); 
						DESTROY((yyvsp[-1].val));	
	                        (yyloc).first_column = (yylsp[-1]).first_column; (yyloc).last_column = (yylsp[0]).last_column; 
							(yyloc).first_line=0; (yyloc).last_line=0;;}
    break;

  case 17:
#line 228 "ast_expr2.y"
    { (yyval.val) = op_times ((yyvsp[-2].val), (yyvsp[0].val)); 
						DESTROY((yyvsp[-1].val));	
	                       (yyloc).first_column = (yylsp[-2]).first_column; (yyloc).last_column = (yylsp[0]).last_column; 
						   (yyloc).first_line=0; (yyloc).last_line=0;;}
    break;

  case 18:
#line 232 "ast_expr2.y"
    { (yyval.val) = op_div ((yyvsp[-2].val), (yyvsp[0].val)); 
						DESTROY((yyvsp[-1].val));	
	                      (yyloc).first_column = (yylsp[-2]).first_column; (yyloc).last_column = (yylsp[0]).last_column; 
						  (yyloc).first_line=0; (yyloc).last_line=0;;}
    break;

  case 19:
#line 236 "ast_expr2.y"
    { (yyval.val) = op_rem ((yyvsp[-2].val), (yyvsp[0].val)); 
						DESTROY((yyvsp[-1].val));	
	                      (yyloc).first_column = (yylsp[-2]).first_column; (yyloc).last_column = (yylsp[0]).last_column; 
						  (yyloc).first_line=0; (yyloc).last_line=0;;}
    break;

  case 20:
#line 240 "ast_expr2.y"
    { (yyval.val) = op_colon ((yyvsp[-2].val), (yyvsp[0].val)); 
						DESTROY((yyvsp[-1].val));	
	                        (yyloc).first_column = (yylsp[-2]).first_column; (yyloc).last_column = (yylsp[0]).last_column; 
							(yyloc).first_line=0; (yyloc).last_line=0;;}
    break;

  case 21:
#line 244 "ast_expr2.y"
    { (yyval.val) = op_eqtilde ((yyvsp[-2].val), (yyvsp[0].val)); 
						DESTROY((yyvsp[-1].val));	
	                        (yyloc).first_column = (yylsp[-2]).first_column; (yyloc).last_column = (yylsp[0]).last_column; 
							(yyloc).first_line=0; (yyloc).last_line=0;;}
    break;

  case 22:
#line 248 "ast_expr2.y"
    { (yyval.val) = op_cond ((yyvsp[-4].val), (yyvsp[-2].val), (yyvsp[0].val)); 
						DESTROY((yyvsp[-3].val));	
						DESTROY((yyvsp[-1].val));	
	                        (yyloc).first_column = (yylsp[-4]).first_column; (yyloc).last_column = (yylsp[-2]).last_column; 
							(yyloc).first_line=0; (yyloc).last_line=0;;}
    break;


    }

/* Line 1037 of yacc.c.  */
#line 1445 "ast_expr2.c"

  yyvsp -= yylen;
  yyssp -= yylen;
  yylsp -= yylen;

  YY_STACK_PRINT (yyss, yyssp);

  *++yyvsp = yyval;
  *++yylsp = yyloc;

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

  goto yynewstate;


/*------------------------------------.
| yyerrlab -- here on detecting error |
`------------------------------------*/
yyerrlab:
  /* If not already recovering from an error, report this error.  */
  if (!yyerrstatus)
    {
      ++yynerrs;
#if YYERROR_VERBOSE
      yyn = yypact[yystate];

      if (YYPACT_NINF < yyn && yyn < YYLAST)
	{
	  YYSIZE_T yysize = 0;
	  int yytype = YYTRANSLATE (yychar);
	  const char* yyprefix;
	  char *yymsg;
	  int yyx;

	  /* Start YYX at -YYN if negative to avoid negative indexes in
	     YYCHECK.  */
	  int yyxbegin = yyn < 0 ? -yyn : 0;

	  /* Stay within bounds of both yycheck and yytname.  */
	  int yychecklim = YYLAST - yyn;
	  int yyxend = yychecklim < YYNTOKENS ? yychecklim : YYNTOKENS;
	  int yycount = 0;

	  yyprefix = ", expecting ";
	  for (yyx = yyxbegin; yyx < yyxend; ++yyx)
	    if (yycheck[yyx + yyn] == yyx && yyx != YYTERROR)
	      {
		yysize += yystrlen (yyprefix) + yystrlen (yytname [yyx]);
		yycount += 1;
		if (yycount == 5)
		  {
		    yysize = 0;
		    break;
		  }
	      }
	  yysize += (sizeof ("syntax error, unexpected ")
		     + yystrlen (yytname[yytype]));
	  yymsg = (char *) YYSTACK_ALLOC (yysize);
	  if (yymsg != 0)
	    {
	      char *yyp = yystpcpy (yymsg, "syntax error, unexpected ");
	      yyp = yystpcpy (yyp, yytname[yytype]);

	      if (yycount < 5)
		{
		  yyprefix = ", expecting ";
		  for (yyx = yyxbegin; yyx < yyxend; ++yyx)
		    if (yycheck[yyx + yyn] == yyx && yyx != YYTERROR)
		      {
			yyp = yystpcpy (yyp, yyprefix);
			yyp = yystpcpy (yyp, yytname[yyx]);
			yyprefix = " or ";
		      }
		}
	      yyerror (yymsg);
	      YYSTACK_FREE (yymsg);
	    }
	  else
	    yyerror ("syntax error; also virtual memory exhausted");
	}
      else
#endif /* YYERROR_VERBOSE */
	yyerror ("syntax error");
    }

  yyerror_range[0] = yylloc;

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

      if (yychar <= YYEOF)
        {
          /* If at end of input, pop the error token,
	     then the rest of the stack, then return failure.  */
	  if (yychar == YYEOF)
	     for (;;)
	       {
                 yyerror_range[0] = *yylsp;
		 YYPOPSTACK;
		 if (yyssp == yyss)
		   YYABORT;
		 yydestruct ("Error: popping",
                             yystos[*yyssp], yyvsp, yylsp);
	       }
        }
      else
	{
	  yydestruct ("Error: discarding", yytoken, &yylval, &yylloc);
	  yychar = YYEMPTY;
	}
    }

  /* Else will try to reuse look-ahead token after shifting the error
     token.  */
  goto yyerrlab1;


/*---------------------------------------------------.
| yyerrorlab -- error raised explicitly by YYERROR.  |
`---------------------------------------------------*/
yyerrorlab:

#ifdef __GNUC__
  /* Pacify GCC when the user code never invokes YYERROR and the label
     yyerrorlab therefore never appears in user code.  */
  if (0)
     goto yyerrorlab;
#endif

  yyerror_range[0] = yylsp[1-yylen];
  yylsp -= yylen;
  yyvsp -= yylen;
  yyssp -= yylen;
  yystate = *yyssp;
  goto yyerrlab1;


/*-------------------------------------------------------------.
| yyerrlab1 -- common code for both syntax error and YYERROR.  |
`-------------------------------------------------------------*/
yyerrlab1:
  yyerrstatus = 3;	/* Each real token shifted decrements this.  */

  for (;;)
    {
      yyn = yypact[yystate];
      if (yyn != YYPACT_NINF)
	{
	  yyn += YYTERROR;
	  if (0 <= yyn && yyn <= YYLAST && yycheck[yyn] == YYTERROR)
	    {
	      yyn = yytable[yyn];
	      if (0 < yyn)
		break;
	    }
	}

      /* Pop the current state because it cannot handle the error token.  */
      if (yyssp == yyss)
	YYABORT;

      yyerror_range[0] = *yylsp;
      yydestruct ("Error: popping", yystos[yystate], yyvsp, yylsp);
      YYPOPSTACK;
      yystate = *yyssp;
      YY_STACK_PRINT (yyss, yyssp);
    }

  if (yyn == YYFINAL)
    YYACCEPT;

  *++yyvsp = yylval;

  yyerror_range[1] = yylloc;
  /* Using YYLLOC is tempting, but would change the location of
     the look-ahead.  YYLOC is available though. */
  YYLLOC_DEFAULT (yyloc, yyerror_range - 1, 2);
  *++yylsp = yyloc;

  /* Shift the error token. */
  YY_SYMBOL_PRINT ("Shifting", yystos[yyn], yyvsp, yylsp);

  yystate = yyn;
  goto yynewstate;


/*-------------------------------------.
| yyacceptlab -- YYACCEPT comes here.  |
`-------------------------------------*/
yyacceptlab:
  yyresult = 0;
  goto yyreturn;

/*-----------------------------------.
| yyabortlab -- YYABORT comes here.  |
`-----------------------------------*/
yyabortlab:
  yydestruct ("Error: discarding lookahead",
              yytoken, &yylval, &yylloc);
  yychar = YYEMPTY;
  yyresult = 1;
  goto yyreturn;

#ifndef yyoverflow
/*----------------------------------------------.
| yyoverflowlab -- parser overflow comes here.  |
`----------------------------------------------*/
yyoverflowlab:
  yyerror ("parser stack overflow");
  yyresult = 2;
  /* Fall through.  */
#endif

yyreturn:
#ifndef yyoverflow
  if (yyss != yyssa)
    YYSTACK_FREE (yyss);
#endif
  return yyresult;
}


#line 255 "ast_expr2.y"


static struct val *
make_integer (quad_t i)
{
	struct val *vp;

	vp = (struct val *) malloc (sizeof (*vp));
	if (vp == NULL) {
		ast_log(LOG_WARNING, "malloc() failed\n");
		return(NULL);
	}

	vp->type = AST_EXPR_integer;
	vp->u.i  = i;
	return vp; 
}

static struct val *
make_str (const char *s)
{
	struct val *vp;
	size_t i;
	int isint;

	vp = (struct val *) malloc (sizeof (*vp));
	if (vp == NULL || ((vp->u.s = strdup (s)) == NULL)) {
		ast_log(LOG_WARNING,"malloc() failed\n");
		return(NULL);
	}

	for(i = 1, isint = isdigit(s[0]) || s[0] == '-';
	    isint && i < strlen(s);
	    i++)
	{
		if(!isdigit(s[i]))
			 isint = 0;
	}

	if (isint)
		vp->type = AST_EXPR_numeric_string;
	else	
		vp->type = AST_EXPR_string;

	return vp;
}


static void
free_value (struct val *vp)
{	
	if (vp==NULL) {
		return;
	}
	if (vp->type == AST_EXPR_string || vp->type == AST_EXPR_numeric_string)
		free (vp->u.s);	
	free(vp);
}


static quad_t
to_integer (struct val *vp)
{
	quad_t i;
	
	if (vp == NULL) {
		ast_log(LOG_WARNING,"vp==NULL in to_integer()\n");
		return(0);
	}

	if (vp->type == AST_EXPR_integer)
		return 1;

	if (vp->type == AST_EXPR_string)
		return 0;

	/* vp->type == AST_EXPR_numeric_string, make it numeric */
	errno = 0;
	i  = strtoll(vp->u.s, (char**)NULL, 10);
	if (errno != 0) {
		ast_log(LOG_WARNING,"Conversion of %s to integer under/overflowed!\n", vp->u.s);
		free(vp->u.s);
		vp->u.s = 0;
		return(0);
	}
	free (vp->u.s);
	vp->u.i = i;
	vp->type = AST_EXPR_integer;
	return 1;
}

static void
strip_quotes(struct val *vp)
{
	if (vp->type != AST_EXPR_string && vp->type != AST_EXPR_numeric_string)
		return;
	
	if( vp->u.s[0] == '"' && vp->u.s[strlen(vp->u.s)-1] == '"' )
	{
		char *f, *t;
		f = vp->u.s;
		t = vp->u.s;
		
		while( *f )
		{
			if( *f  && *f != '"' )
				*t++ = *f++;
			else
				f++;
		}
		*t = *f;
	}
}

static void
to_string (struct val *vp)
{
	char *tmp;

	if (vp->type == AST_EXPR_string || vp->type == AST_EXPR_numeric_string)
		return;

	tmp = malloc ((size_t)25);
	if (tmp == NULL) {
		ast_log(LOG_WARNING,"malloc() failed\n");
		return;
	}

	sprintf(tmp, "%ld", (long int) vp->u.i);
	vp->type = AST_EXPR_string;
	vp->u.s  = tmp;
}


static int
isstring (struct val *vp)
{
	/* only TRUE if this string is not a valid integer */
	return (vp->type == AST_EXPR_string);
}


static int
is_zero_or_null (struct val *vp)
{
	if (vp->type == AST_EXPR_integer) {
		return (vp->u.i == 0);
	} else {
		return (*vp->u.s == 0 || (to_integer (vp) && vp->u.i == 0));
	}
	/* NOTREACHED */
}

#ifdef STANDALONE

void ast_log(int level, const char *file, int line, const char *function, const char *fmt, ...)
{
	va_list vars;
	va_start(vars,fmt);
	
        printf("LOG: lev:%d file:%s  line:%d func: %s  ",
                   level, file, line, function);
	vprintf(fmt, vars);
	fflush(stdout);
	va_end(vars);
}


int main(int argc,char **argv) {
	char s[4096];
	
	if (ast_expr(argv[1], s, sizeof(s)))
		printf("=====%s======\n",s);
	else
		printf("No result\n");
}

#endif

#undef ast_yyerror
#define ast_yyerror(x) ast_yyerror(x, YYLTYPE *yylloc, struct parse_io *parseio)

/* I put the ast_yyerror func in the flex input file,
   because it refers to the buffer state. Best to
   let it access the BUFFER stuff there and not trying
   define all the structs, macros etc. in this file! */


static struct val *
op_or (struct val *a, struct val *b)
{
	if (is_zero_or_null (a)) {
		free_value (a);
		return (b);
	} else {
		free_value (b);
		return (a);
	}
}
		
static struct val *
op_and (struct val *a, struct val *b)
{
	if (is_zero_or_null (a) || is_zero_or_null (b)) {
		free_value (a);
		free_value (b);
		return (make_integer ((quad_t)0));
	} else {
		free_value (b);
		return (a);
	}
}

static struct val *
op_eq (struct val *a, struct val *b)
{
	struct val *r; 

	if (isstring (a) || isstring (b)) {
		to_string (a);
		to_string (b);	
		r = make_integer ((quad_t)(strcoll (a->u.s, b->u.s) == 0));
	} else {
#ifdef DEBUG_FOR_CONVERSIONS
		char buffer[2000];
		sprintf(buffer,"Converting '%s' and '%s' ", a->u.s, b->u.s);
#endif
		(void)to_integer(a);
		(void)to_integer(b);
#ifdef DEBUG_FOR_CONVERSIONS
		ast_log(LOG_WARNING,"%s to '%lld' and '%lld'\n", buffer, a->u.i, b->u.i);
#endif
		r = make_integer ((quad_t)(a->u.i == b->u.i));
	}

	free_value (a);
	free_value (b);
	return r;
}

static struct val *
op_gt (struct val *a, struct val *b)
{
	struct val *r;

	if (isstring (a) || isstring (b)) {
		to_string (a);
		to_string (b);
		r = make_integer ((quad_t)(strcoll (a->u.s, b->u.s) > 0));
	} else {
		(void)to_integer(a);
		(void)to_integer(b);
		r = make_integer ((quad_t)(a->u.i > b->u.i));
	}

	free_value (a);
	free_value (b);
	return r;
}

static struct val *
op_lt (struct val *a, struct val *b)
{
	struct val *r;

	if (isstring (a) || isstring (b)) {
		to_string (a);
		to_string (b);
		r = make_integer ((quad_t)(strcoll (a->u.s, b->u.s) < 0));
	} else {
		(void)to_integer(a);
		(void)to_integer(b);
		r = make_integer ((quad_t)(a->u.i < b->u.i));
	}

	free_value (a);
	free_value (b);
	return r;
}

static struct val *
op_ge (struct val *a, struct val *b)
{
	struct val *r;

	if (isstring (a) || isstring (b)) {
		to_string (a);
		to_string (b);
		r = make_integer ((quad_t)(strcoll (a->u.s, b->u.s) >= 0));
	} else {
		(void)to_integer(a);
		(void)to_integer(b);
		r = make_integer ((quad_t)(a->u.i >= b->u.i));
	}

	free_value (a);
	free_value (b);
	return r;
}

static struct val *
op_le (struct val *a, struct val *b)
{
	struct val *r;

	if (isstring (a) || isstring (b)) {
		to_string (a);
		to_string (b);
		r = make_integer ((quad_t)(strcoll (a->u.s, b->u.s) <= 0));
	} else {
		(void)to_integer(a);
		(void)to_integer(b);
		r = make_integer ((quad_t)(a->u.i <= b->u.i));
	}

	free_value (a);
	free_value (b);
	return r;
}

static struct val *
op_cond (struct val *a, struct val *b, struct val *c)
{
	struct val *r;

	if( isstring(a) )
	{
		if( strlen(a->u.s) && strcmp(a->u.s, "\"\"") != 0 && strcmp(a->u.s,"0") != 0 )
		{
			free_value(a);
			free_value(c);
			r = b;
		}
		else
		{
			free_value(a);
			free_value(b);
			r = c;
		}
	}
	else
	{
		(void)to_integer(a);
		if( a->u.i )
		{
			free_value(a);
			free_value(c);
			r = b;
		}
		else
		{
			free_value(a);
			free_value(b);
			r = c;
		}
	}
	return r;
}

static struct val *
op_ne (struct val *a, struct val *b)
{
	struct val *r;

	if (isstring (a) || isstring (b)) {
		to_string (a);
		to_string (b);
		r = make_integer ((quad_t)(strcoll (a->u.s, b->u.s) != 0));
	} else {
		(void)to_integer(a);
		(void)to_integer(b);
		r = make_integer ((quad_t)(a->u.i != b->u.i));
	}

	free_value (a);
	free_value (b);
	return r;
}

static int
chk_plus (quad_t a, quad_t b, quad_t r)
{
	/* sum of two positive numbers must be positive */
	if (a > 0 && b > 0 && r <= 0)
		return 1;
	/* sum of two negative numbers must be negative */
	if (a < 0 && b < 0 && r >= 0)
		return 1;
	/* all other cases are OK */
	return 0;
}

static struct val *
op_plus (struct val *a, struct val *b)
{
	struct val *r;

	if (!to_integer (a)) {
		ast_log(LOG_WARNING,"non-numeric argument\n");
		if (!to_integer (b)) {
			free_value(a);
			free_value(b);
			return make_integer(0);
		} else {
			free_value(a);
			return (b);
		}
	} else if (!to_integer(b)) {
		free_value(b);
		return (a);
	}

	r = make_integer (/*(quad_t)*/(a->u.i + b->u.i));
	if (chk_plus (a->u.i, b->u.i, r->u.i)) {
		ast_log(LOG_WARNING,"overflow\n");
	}
	free_value (a);
	free_value (b);
	return r;
}

static int
chk_minus (quad_t a, quad_t b, quad_t r)
{
	/* special case subtraction of QUAD_MIN */
	if (b == QUAD_MIN) {
		if (a >= 0)
			return 1;
		else
			return 0;
	}
	/* this is allowed for b != QUAD_MIN */
	return chk_plus (a, -b, r);
}

static struct val *
op_minus (struct val *a, struct val *b)
{
	struct val *r;

	if (!to_integer (a)) {
		ast_log(LOG_WARNING, "non-numeric argument\n");
		if (!to_integer (b)) {
			free_value(a);
			free_value(b);
			return make_integer(0);
		} else {
			r = make_integer(0 - b->u.i);
			free_value(a);
			free_value(b);
			return (r);
		}
	} else if (!to_integer(b)) {
		ast_log(LOG_WARNING, "non-numeric argument\n");
		free_value(b);
		return (a);
	}

	r = make_integer (/*(quad_t)*/(a->u.i - b->u.i));
	if (chk_minus (a->u.i, b->u.i, r->u.i)) {
		ast_log(LOG_WARNING, "overflow\n");
	}
	free_value (a);
	free_value (b);
	return r;
}

static struct val *
op_negate (struct val *a)
{
	struct val *r;

	if (!to_integer (a) ) {
		free_value(a);
		ast_log(LOG_WARNING, "non-numeric argument\n");
		return make_integer(0);
	}

	r = make_integer (/*(quad_t)*/(- a->u.i));
	if (chk_minus (0, a->u.i, r->u.i)) {
		ast_log(LOG_WARNING, "overflow\n");
	}
	free_value (a);
	return r;
}

static struct val *
op_compl (struct val *a)
{
	int v1 = 1;
	struct val *r;
	
	if( !a )
	{
		v1 = 0;
	}
	else
	{
		switch( a->type )
		{
		case AST_EXPR_integer:
			if( a->u.i == 0 )
				v1 = 0;
			break;
			
		case AST_EXPR_string:
			if( a->u.s == 0 )
				v1 = 0;
			else
			{
				if( a->u.s[0] == 0 )
					v1 = 0;
				else if (strlen(a->u.s) == 1 && a->u.s[0] == '0' )
					v1 = 0;
			}
			break;
			
		case AST_EXPR_numeric_string:
			if( a->u.s == 0 )
				v1 = 0;
			else
			{
				if( a->u.s[0] == 0 )
					v1 = 0;
				else if (strlen(a->u.s) == 1 && a->u.s[0] == '0' )
					v1 = 0;
			}
			break;
		}
	}
	
	r = make_integer (!v1);
	free_value (a);
	return r;
}

static int
chk_times (quad_t a, quad_t b, quad_t r)
{
	/* special case: first operand is 0, no overflow possible */
	if (a == 0)
		return 0;
	/* cerify that result of division matches second operand */
	if (r / a != b)
		return 1;
	return 0;
}

static struct val *
op_times (struct val *a, struct val *b)
{
	struct val *r;

	if (!to_integer (a) || !to_integer (b)) {
		free_value(a);
		free_value(b);
		ast_log(LOG_WARNING, "non-numeric argument\n");
		return(make_integer(0));
	}

	r = make_integer (/*(quad_t)*/(a->u.i * b->u.i));
	if (chk_times (a->u.i, b->u.i, r->u.i)) {
		ast_log(LOG_WARNING, "overflow\n");
	}
	free_value (a);
	free_value (b);
	return (r);
}

static int
chk_div (quad_t a, quad_t b)
{
	/* div by zero has been taken care of before */
	/* only QUAD_MIN / -1 causes overflow */
	if (a == QUAD_MIN && b == -1)
		return 1;
	/* everything else is OK */
	return 0;
}

static struct val *
op_div (struct val *a, struct val *b)
{
	struct val *r;

	if (!to_integer (a)) {
		free_value(a);
		free_value(b);
		ast_log(LOG_WARNING, "non-numeric argument\n");
		return make_integer(0);
	} else if (!to_integer (b)) {
		free_value(a);
		free_value(b);
		ast_log(LOG_WARNING, "non-numeric argument\n");
		return make_integer(INT_MAX);
	}

	if (b->u.i == 0) {
		ast_log(LOG_WARNING, "division by zero\n");		
		free_value(a);
		free_value(b);
		return make_integer(INT_MAX);
	}

	r = make_integer (/*(quad_t)*/(a->u.i / b->u.i));
	if (chk_div (a->u.i, b->u.i)) {
		ast_log(LOG_WARNING, "overflow\n");
	}
	free_value (a);
	free_value (b);
	return r;
}
	
static struct val *
op_rem (struct val *a, struct val *b)
{
	struct val *r;

	if (!to_integer (a) || !to_integer (b)) {
		ast_log(LOG_WARNING, "non-numeric argument\n");
		free_value(a);
		free_value(b);
		return make_integer(0);
	}

	if (b->u.i == 0) {
		ast_log(LOG_WARNING, "div by zero\n");
		free_value(a);
		return(b);
	}

	r = make_integer (/*(quad_t)*/(a->u.i % b->u.i));
	/* chk_rem necessary ??? */
	free_value (a);
	free_value (b);
	return r;
}
	

static struct val *
op_colon (struct val *a, struct val *b)
{
	regex_t rp;
	regmatch_t rm[2];
	char errbuf[256];
	int eval;
	struct val *v;

	/* coerce to both arguments to strings */
	to_string(a);
	to_string(b);
	/* strip double quotes from both -- they'll screw up the pattern, and the search string starting at ^ */
	strip_quotes(a);
	strip_quotes(b);
	/* compile regular expression */
	if ((eval = regcomp (&rp, b->u.s, REG_EXTENDED)) != 0) {
		regerror (eval, &rp, errbuf, sizeof(errbuf));
		ast_log(LOG_WARNING,"regcomp() error : %s",errbuf);
		free_value(a);
		free_value(b);
		return make_str("");		
	}

	/* compare string against pattern */
	/* remember that patterns are anchored to the beginning of the line */
	if (regexec(&rp, a->u.s, (size_t)2, rm, 0) == 0 && rm[0].rm_so == 0) {
		if (rm[1].rm_so >= 0) {
			*(a->u.s + rm[1].rm_eo) = '\0';
			v = make_str (a->u.s + rm[1].rm_so);

		} else {
			v = make_integer ((quad_t)(rm[0].rm_eo - rm[0].rm_so));
		}
	} else {
		if (rp.re_nsub == 0) {
			v = make_integer ((quad_t)0);
		} else {
			v = make_str ("");
		}
	}

	/* free arguments and pattern buffer */
	free_value (a);
	free_value (b);
	regfree (&rp);

	return v;
}
	

static struct val *
op_eqtilde (struct val *a, struct val *b)
{
	regex_t rp;
	regmatch_t rm[2];
	char errbuf[256];
	int eval;
	struct val *v;

	/* coerce to both arguments to strings */
	to_string(a);
	to_string(b);
	/* strip double quotes from both -- they'll screw up the pattern, and the search string starting at ^ */
	strip_quotes(a);
	strip_quotes(b);
	/* compile regular expression */
	if ((eval = regcomp (&rp, b->u.s, REG_EXTENDED)) != 0) {
		regerror (eval, &rp, errbuf, sizeof(errbuf));
		ast_log(LOG_WARNING,"regcomp() error : %s",errbuf);
		free_value(a);
		free_value(b);
		return make_str("");		
	}

	/* compare string against pattern */
	/* remember that patterns are anchored to the beginning of the line */
	if (regexec(&rp, a->u.s, (size_t)2, rm, 0) == 0 ) {
		if (rm[1].rm_so >= 0) {
			*(a->u.s + rm[1].rm_eo) = '\0';
			v = make_str (a->u.s + rm[1].rm_so);

		} else {
			v = make_integer ((quad_t)(rm[0].rm_eo - rm[0].rm_so));
		}
	} else {
		if (rp.re_nsub == 0) {
			v = make_integer ((quad_t)0);
		} else {
			v = make_str ("");
		}
	}

	/* free arguments and pattern buffer */
	free_value (a);
	free_value (b);
	regfree (&rp);

	return v;
}