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guc-file.c

#line 2 "guc-file.c"

#line 4 "guc-file.c"

#define  YY_INT_ALIGNED short int

/* A lexical scanner generated by flex */

#define yy_create_buffer GUC_yy_create_buffer
#define yy_delete_buffer GUC_yy_delete_buffer
#define yy_flex_debug GUC_yy_flex_debug
#define yy_init_buffer GUC_yy_init_buffer
#define yy_flush_buffer GUC_yy_flush_buffer
#define yy_load_buffer_state GUC_yy_load_buffer_state
#define yy_switch_to_buffer GUC_yy_switch_to_buffer
#define yyin GUC_yyin
#define yyleng GUC_yyleng
#define yylex GUC_yylex
#define yylineno GUC_yylineno
#define yyout GUC_yyout
#define yyrestart GUC_yyrestart
#define yytext GUC_yytext
#define yywrap GUC_yywrap
#define yyalloc GUC_yyalloc
#define yyrealloc GUC_yyrealloc
#define yyfree GUC_yyfree

#define FLEX_SCANNER
#define YY_FLEX_MAJOR_VERSION 2
#define YY_FLEX_MINOR_VERSION 5
#define YY_FLEX_SUBMINOR_VERSION 35
#if YY_FLEX_SUBMINOR_VERSION > 0
#define FLEX_BETA
#endif

/* First, we deal with  platform-specific or compiler-specific issues. */

/* begin standard C headers. */
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>

/* end standard C headers. */

/* flex integer type definitions */

#ifndef FLEXINT_H
#define FLEXINT_H

/* C99 systems have <inttypes.h>. Non-C99 systems may or may not. */

#if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L

/* C99 says to define __STDC_LIMIT_MACROS before including stdint.h,
 * if you want the limit (max/min) macros for int types. 
 */
#ifndef __STDC_LIMIT_MACROS
#define __STDC_LIMIT_MACROS 1
#endif

#include <inttypes.h>
typedef int8_t flex_int8_t;
typedef uint8_t flex_uint8_t;
typedef int16_t flex_int16_t;
typedef uint16_t flex_uint16_t;
typedef int32_t flex_int32_t;
typedef uint32_t flex_uint32_t;
#else
typedef signed char flex_int8_t;
typedef short int flex_int16_t;
typedef int flex_int32_t;
typedef unsigned char flex_uint8_t; 
typedef unsigned short int flex_uint16_t;
typedef unsigned int flex_uint32_t;
#endif /* ! C99 */

/* Limits of integral types. */
#ifndef INT8_MIN
#define INT8_MIN               (-128)
#endif
#ifndef INT16_MIN
#define INT16_MIN              (-32767-1)
#endif
#ifndef INT32_MIN
#define INT32_MIN              (-2147483647-1)
#endif
#ifndef INT8_MAX
#define INT8_MAX               (127)
#endif
#ifndef INT16_MAX
#define INT16_MAX              (32767)
#endif
#ifndef INT32_MAX
#define INT32_MAX              (2147483647)
#endif
#ifndef UINT8_MAX
#define UINT8_MAX              (255U)
#endif
#ifndef UINT16_MAX
#define UINT16_MAX             (65535U)
#endif
#ifndef UINT32_MAX
#define UINT32_MAX             (4294967295U)
#endif

#endif /* ! FLEXINT_H */

#ifdef __cplusplus

/* The "const" storage-class-modifier is valid. */
#define YY_USE_CONST

#else /* ! __cplusplus */

/* C99 requires __STDC__ to be defined as 1. */
#if defined (__STDC__)

#define YY_USE_CONST

#endif      /* defined (__STDC__) */
#endif      /* ! __cplusplus */

#ifdef YY_USE_CONST
#define yyconst const
#else
#define yyconst
#endif

/* Returned upon end-of-file. */
#define YY_NULL 0

/* Promotes a possibly negative, possibly signed char to an unsigned
 * integer for use as an array index.  If the signed char is negative,
 * we want to instead treat it as an 8-bit unsigned char, hence the
 * double cast.
 */
#define YY_SC_TO_UI(c) ((unsigned int) (unsigned char) c)

/* Enter a start condition.  This macro really ought to take a parameter,
 * but we do it the disgusting crufty way forced on us by the ()-less
 * definition of BEGIN.
 */
#define BEGIN (yy_start) = 1 + 2 *

/* Translate the current start state into a value that can be later handed
 * to BEGIN to return to the state.  The YYSTATE alias is for lex
 * compatibility.
 */
#define YY_START (((yy_start) - 1) / 2)
#define YYSTATE YY_START

/* Action number for EOF rule of a given start state. */
#define YY_STATE_EOF(state) (YY_END_OF_BUFFER + state + 1)

/* Special action meaning "start processing a new file". */
#define YY_NEW_FILE GUC_yyrestart(GUC_yyin  )

#define YY_END_OF_BUFFER_CHAR 0

/* Size of default input buffer. */
#ifndef YY_BUF_SIZE
#define YY_BUF_SIZE 16384
#endif

/* The state buf must be large enough to hold one state per character in the main buffer.
 */
#define YY_STATE_BUF_SIZE   ((YY_BUF_SIZE + 2) * sizeof(yy_state_type))

#ifndef YY_TYPEDEF_YY_BUFFER_STATE
#define YY_TYPEDEF_YY_BUFFER_STATE
typedef struct yy_buffer_state *YY_BUFFER_STATE;
#endif

extern int GUC_yyleng;

extern FILE *GUC_yyin, *GUC_yyout;

#define EOB_ACT_CONTINUE_SCAN 0
#define EOB_ACT_END_OF_FILE 1
#define EOB_ACT_LAST_MATCH 2

    #define YY_LESS_LINENO(n)
    
/* Return all but the first "n" matched characters back to the input stream. */
#define yyless(n) \
      do \
            { \
            /* Undo effects of setting up GUC_yytext. */ \
        int yyless_macro_arg = (n); \
        YY_LESS_LINENO(yyless_macro_arg);\
            *yy_cp = (yy_hold_char); \
            YY_RESTORE_YY_MORE_OFFSET \
            (yy_c_buf_p) = yy_cp = yy_bp + yyless_macro_arg - YY_MORE_ADJ; \
            YY_DO_BEFORE_ACTION; /* set up GUC_yytext again */ \
            } \
      while ( 0 )

#define unput(c) yyunput( c, (yytext_ptr)  )

#ifndef YY_TYPEDEF_YY_SIZE_T
#define YY_TYPEDEF_YY_SIZE_T
typedef size_t yy_size_t;
#endif

#ifndef YY_STRUCT_YY_BUFFER_STATE
#define YY_STRUCT_YY_BUFFER_STATE
struct yy_buffer_state
      {
      FILE *yy_input_file;

      char *yy_ch_buf;        /* input buffer */
      char *yy_buf_pos;       /* current position in input buffer */

      /* Size of input buffer in bytes, not including room for EOB
       * characters.
       */
      yy_size_t yy_buf_size;

      /* Number of characters read into yy_ch_buf, not including EOB
       * characters.
       */
      int yy_n_chars;

      /* Whether we "own" the buffer - i.e., we know we created it,
       * and can realloc() it to grow it, and should free() it to
       * delete it.
       */
      int yy_is_our_buffer;

      /* Whether this is an "interactive" input source; if so, and
       * if we're using stdio for input, then we want to use getc()
       * instead of fread(), to make sure we stop fetching input after
       * each newline.
       */
      int yy_is_interactive;

      /* Whether we're considered to be at the beginning of a line.
       * If so, '^' rules will be active on the next match, otherwise
       * not.
       */
      int yy_at_bol;

    int yy_bs_lineno; /**< The line count. */
    int yy_bs_column; /**< The column count. */
    
      /* Whether to try to fill the input buffer when we reach the
       * end of it.
       */
      int yy_fill_buffer;

      int yy_buffer_status;

#define YY_BUFFER_NEW 0
#define YY_BUFFER_NORMAL 1
      /* When an EOF's been seen but there's still some text to process
       * then we mark the buffer as YY_EOF_PENDING, to indicate that we
       * shouldn't try reading from the input source any more.  We might
       * still have a bunch of tokens to match, though, because of
       * possible backing-up.
       *
       * When we actually see the EOF, we change the status to "new"
       * (via GUC_yyrestart()), so that the user can continue scanning by
       * just pointing GUC_yyin at a new input file.
       */
#define YY_BUFFER_EOF_PENDING 2

      };
#endif /* !YY_STRUCT_YY_BUFFER_STATE */

/* Stack of input buffers. */
static size_t yy_buffer_stack_top = 0; /**< index of top of stack. */
static size_t yy_buffer_stack_max = 0; /**< capacity of stack. */
static YY_BUFFER_STATE * yy_buffer_stack = 0; /**< Stack as an array. */

/* We provide macros for accessing buffer states in case in the
 * future we want to put the buffer states in a more general
 * "scanner state".
 *
 * Returns the top of the stack, or NULL.
 */
#define YY_CURRENT_BUFFER ( (yy_buffer_stack) \
                          ? (yy_buffer_stack)[(yy_buffer_stack_top)] \
                          : NULL)

/* Same as previous macro, but useful when we know that the buffer stack is not
 * NULL or when we need an lvalue. For internal use only.
 */
#define YY_CURRENT_BUFFER_LVALUE (yy_buffer_stack)[(yy_buffer_stack_top)]

/* yy_hold_char holds the character lost when GUC_yytext is formed. */
static char yy_hold_char;
static int yy_n_chars;        /* number of characters read into yy_ch_buf */
int GUC_yyleng;

/* Points to current character in buffer. */
static char *yy_c_buf_p = (char *) 0;
static int yy_init = 0;       /* whether we need to initialize */
static int yy_start = 0;      /* start state number */

/* Flag which is used to allow GUC_yywrap()'s to do buffer switches
 * instead of setting up a fresh GUC_yyin.  A bit of a hack ...
 */
static int yy_did_buffer_switch_on_eof;

void GUC_yyrestart (FILE *input_file  );
void GUC_yy_switch_to_buffer (YY_BUFFER_STATE new_buffer  );
YY_BUFFER_STATE GUC_yy_create_buffer (FILE *file,int size  );
void GUC_yy_delete_buffer (YY_BUFFER_STATE b  );
void GUC_yy_flush_buffer (YY_BUFFER_STATE b  );
void GUC_yypush_buffer_state (YY_BUFFER_STATE new_buffer  );
void GUC_yypop_buffer_state (void );

static void GUC_yyensure_buffer_stack (void );
static void GUC_yy_load_buffer_state (void );
static void GUC_yy_init_buffer (YY_BUFFER_STATE b,FILE *file  );

#define YY_FLUSH_BUFFER GUC_yy_flush_buffer(YY_CURRENT_BUFFER )

YY_BUFFER_STATE GUC_yy_scan_buffer (char *base,yy_size_t size  );
YY_BUFFER_STATE GUC_yy_scan_string (yyconst char *yy_str  );
YY_BUFFER_STATE GUC_yy_scan_bytes (yyconst char *bytes,int len  );

void *GUC_yyalloc (yy_size_t  );
void *GUC_yyrealloc (void *,yy_size_t  );
void GUC_yyfree (void *  );

#define yy_new_buffer GUC_yy_create_buffer

#define yy_set_interactive(is_interactive) \
      { \
      if ( ! YY_CURRENT_BUFFER ){ \
        GUC_yyensure_buffer_stack (); \
            YY_CURRENT_BUFFER_LVALUE =    \
            GUC_yy_create_buffer(GUC_yyin,YY_BUF_SIZE ); \
      } \
      YY_CURRENT_BUFFER_LVALUE->yy_is_interactive = is_interactive; \
      }

#define yy_set_bol(at_bol) \
      { \
      if ( ! YY_CURRENT_BUFFER ){\
        GUC_yyensure_buffer_stack (); \
            YY_CURRENT_BUFFER_LVALUE =    \
            GUC_yy_create_buffer(GUC_yyin,YY_BUF_SIZE ); \
      } \
      YY_CURRENT_BUFFER_LVALUE->yy_at_bol = at_bol; \
      }

#define YY_AT_BOL() (YY_CURRENT_BUFFER_LVALUE->yy_at_bol)

/* Begin user sect3 */

#define GUC_yywrap(n) 1
#define YY_SKIP_YYWRAP

typedef unsigned char YY_CHAR;

FILE *GUC_yyin = (FILE *) 0, *GUC_yyout = (FILE *) 0;

typedef int yy_state_type;

extern int GUC_yylineno;

int GUC_yylineno = 1;

extern char *GUC_yytext;
#define yytext_ptr GUC_yytext

static yy_state_type yy_get_previous_state (void );
static yy_state_type yy_try_NUL_trans (yy_state_type current_state  );
static int yy_get_next_buffer (void );
static void yy_fatal_error (yyconst char msg[]  );

/* Done after the current pattern has been matched and before the
 * corresponding action - sets up GUC_yytext.
 */
#define YY_DO_BEFORE_ACTION \
      (yytext_ptr) = yy_bp; \
      GUC_yyleng = (size_t) (yy_cp - yy_bp); \
      (yy_hold_char) = *yy_cp; \
      *yy_cp = '\0'; \
      (yy_c_buf_p) = yy_cp;

#define YY_NUM_RULES 12
#define YY_END_OF_BUFFER 13
/* This struct is not used in this scanner,
   but its presence is necessary. */
struct yy_trans_info
      {
      flex_int32_t yy_verify;
      flex_int32_t yy_nxt;
      };
static yyconst flex_int16_t yy_accept[41] =
    {   0,
        0,    0,   13,   11,    2,    1,    3,   11,   11,    9,
        8,    8,   10,    4,    2,    3,    0,    6,    0,    9,
        8,    8,    9,    0,    8,    8,    7,    7,    4,    4,
        0,    9,    8,    8,    7,    5,    5,    5,    5,    0
    } ;

static yyconst flex_int32_t yy_ec[256] =
    {   0,
        1,    1,    1,    1,    1,    1,    1,    1,    2,    3,
        1,    1,    2,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    2,    1,    1,    4,    1,    1,    1,    5,    1,
        1,    1,    6,    1,    7,    8,    9,   10,   11,   11,
       11,   11,   11,   11,   11,   11,   11,    9,    1,    1,
       12,    1,    1,    1,   13,   13,   13,   13,   14,   13,
       15,   15,   15,   15,   15,   15,   15,   15,   15,   15,
       15,   15,   15,   15,   15,   15,   15,   15,   15,   15,
        1,   16,    1,    1,   17,    1,   13,   13,   13,   13,

       14,   13,   15,   15,   15,   15,   15,   15,   15,   15,
       15,   15,   15,   15,   15,   15,   15,   15,   15,   18,
       15,   15,    1,    1,    1,    1,    1,   19,   19,   19,
       19,   19,   19,   19,   19,   19,   19,   19,   19,   19,
       19,   19,   19,   19,   19,   19,   19,   19,   19,   19,
       19,   19,   19,   19,   19,   19,   19,   19,   19,   19,
       19,   19,   19,   19,   19,   19,   19,   19,   19,   19,
       19,   19,   19,   19,   19,   19,   19,   19,   19,   19,
       19,   19,   19,   19,   19,   19,   19,   19,   19,   19,
       19,   19,   19,   19,   19,   19,   19,   19,   19,   19,

       19,   19,   19,   19,   19,   19,   19,   19,   19,   19,
       19,   19,   19,   19,   19,   19,   19,   19,   19,   19,
       19,   19,   19,   19,   19,   19,   19,   19,   19,   19,
       19,   19,   19,   19,   19,   19,   19,   19,   19,   19,
       19,   19,   19,   19,   19,   19,   19,   19,   19,   19,
       19,   19,   19,   19,   19
    } ;

static yyconst flex_int32_t yy_meta[20] =
    {   0,
        1,    1,    2,    1,    1,    1,    3,    3,    3,    4,
        4,    1,    5,    6,    5,    1,    3,    5,    3
    } ;

static yyconst flex_int16_t yy_base[48] =
    {   0,
        0,    0,   50,  148,   43,  148,    0,   15,   24,   30,
       28,   22,  148,   40,   35,    0,   17,   25,    0,   15,
        0,   10,    0,   52,    0,   54,   10,   66,   79,    0,
       13,   15,    0,    0,    4,   90,  101,    0,    0,  148,
      118,  124,  127,  131,  133,  137,  141
    } ;

static yyconst flex_int16_t yy_def[48] =
    {   0,
       40,    1,   40,   40,   40,   40,   41,   42,   40,   43,
       40,   11,   40,   44,   40,   41,   42,   40,   42,   43,
       11,   11,   20,   40,   45,   40,   46,   40,   44,   29,
       40,   40,   26,   26,   46,   47,   47,   37,   37,    0,
       40,   40,   40,   40,   40,   40,   40
    } ;

static yyconst flex_int16_t yy_nxt[168] =
    {   0,
        4,    5,    6,    7,    8,    9,    9,   10,    4,   11,
       12,   13,   14,   14,   14,    4,   14,   14,   14,   18,
       35,   18,   32,   32,   32,   32,   35,   25,   24,   17,
       19,   20,   19,   21,   22,   20,   15,   22,   22,   25,
       25,   25,   25,   24,   15,   26,   27,   28,   27,   40,
       40,   40,   40,   40,   40,   40,   30,   31,   31,   40,
       40,   32,   32,   33,   33,   40,   34,   34,   25,   40,
       40,   25,   27,   27,   27,   27,   27,   40,   36,   36,
       36,   40,   37,   36,   36,   27,   28,   27,   40,   40,
       40,   40,   40,   40,   40,   30,   27,   27,   27,   40,

       40,   40,   40,   40,   40,   40,   39,   27,   27,   27,
       40,   40,   40,   40,   40,   40,   40,   39,   16,   40,
       16,   16,   16,   16,   17,   40,   17,   17,   17,   17,
       23,   40,   23,   29,   29,   29,   29,   25,   25,   27,
       27,   27,   27,   38,   38,   38,   38,    3,   40,   40,
       40,   40,   40,   40,   40,   40,   40,   40,   40,   40,
       40,   40,   40,   40,   40,   40,   40
    } ;

static yyconst flex_int16_t yy_chk[168] =
    {   0,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    8,
       35,   17,   31,   31,   32,   32,   27,   22,   20,   18,
        8,    9,   17,    9,    9,   11,   15,   11,   11,   12,
       11,   11,   11,   10,    5,   11,   14,   14,   14,    3,
        0,    0,    0,    0,    0,    0,   14,   24,   24,    0,
        0,   24,   24,   26,   26,    0,   26,   26,   26,    0,
        0,   26,   28,   28,   28,   28,   28,    0,   28,   28,
       28,    0,   28,   28,   28,   29,   29,   29,    0,    0,
        0,    0,    0,    0,    0,   29,   36,   36,   36,    0,

        0,    0,    0,    0,    0,    0,   36,   37,   37,   37,
        0,    0,    0,    0,    0,    0,    0,   37,   41,    0,
       41,   41,   41,   41,   42,    0,   42,   42,   42,   42,
       43,    0,   43,   44,   44,   44,   44,   45,   45,   46,
       46,   46,   46,   47,   47,   47,   47,   40,   40,   40,
       40,   40,   40,   40,   40,   40,   40,   40,   40,   40,
       40,   40,   40,   40,   40,   40,   40
    } ;

static yy_state_type yy_last_accepting_state;
static char *yy_last_accepting_cpos;

extern int GUC_yy_flex_debug;
int GUC_yy_flex_debug = 0;

/* The intent behind this definition is that it'll catch
 * any uses of REJECT which flex missed.
 */
#define REJECT reject_used_but_not_detected
#define yymore() yymore_used_but_not_detected
#define YY_MORE_ADJ 0
#define YY_RESTORE_YY_MORE_OFFSET
char *GUC_yytext;
#line 1 "guc-file.l"
/* -*-pgsql-c-*- */
/*
 * Scanner for the configuration file
 *
 * Copyright (c) 2000-2009, PostgreSQL Global Development Group
 *
 * $PostgreSQL: pgsql/src/backend/utils/misc/guc-file.l,v 1.59 2009/04/09 14:21:02 tgl Exp $
 */
#line 11 "guc-file.l"

#include "postgres.h"

#include <ctype.h>
#include <unistd.h>

#include "miscadmin.h"
#include "storage/fd.h"
#include "utils/guc.h"


/* Avoid exit() on fatal scanner errors (a bit ugly -- see yy_fatal_error) */
#undef fprintf
#define fprintf(file, fmt, msg)  ereport(ERROR, (errmsg_internal("%s", msg)))

enum {
      GUC_ID = 1,
      GUC_STRING = 2,
      GUC_INTEGER = 3,
      GUC_REAL = 4,
      GUC_EQUALS = 5,
      GUC_UNQUOTED_STRING = 6,
      GUC_QUALIFIED_ID = 7,
      GUC_EOL = 99,
      GUC_ERROR = 100
};

00553 struct name_value_pair
{
      char       *name;
      char       *value;
      char     *filename;
      int               sourceline;
      struct name_value_pair *next;
};

static unsigned int ConfigFileLineno;

/* flex fails to supply a prototype for GUC_yylex, so provide one */
int GUC_yylex(void);

static bool ParseConfigFile(const char *config_file, const char *calling_file,
                                          int depth, GucContext context, int elevel,
                                          struct name_value_pair **head_p,
                                          struct name_value_pair **tail_p);
static void free_name_value_list(struct name_value_pair * list);
static char *GUC_scanstr(const char *s);

#define YY_NO_INPUT 1
#line 576 "guc-file.c"

#define INITIAL 0

#ifndef YY_NO_UNISTD_H
/* Special case for "unistd.h", since it is non-ANSI. We include it way
 * down here because we want the user's section 1 to have been scanned first.
 * The user has a chance to override it with an option.
 */
#include <unistd.h>
#endif

#ifndef YY_EXTRA_TYPE
#define YY_EXTRA_TYPE void *
#endif

static int yy_init_globals (void );

/* Accessor methods to globals.
   These are made visible to non-reentrant scanners for convenience. */

int GUC_yylex_destroy (void );

int GUC_yyget_debug (void );

void GUC_yyset_debug (int debug_flag  );

YY_EXTRA_TYPE GUC_yyget_extra (void );

void GUC_yyset_extra (YY_EXTRA_TYPE user_defined  );

FILE *GUC_yyget_in (void );

void GUC_yyset_in  (FILE * in_str  );

FILE *GUC_yyget_out (void );

void GUC_yyset_out  (FILE * out_str  );

int GUC_yyget_leng (void );

char *GUC_yyget_text (void );

int GUC_yyget_lineno (void );

void GUC_yyset_lineno (int line_number  );

/* Macros after this point can all be overridden by user definitions in
 * section 1.
 */

#ifndef YY_SKIP_YYWRAP
#ifdef __cplusplus
extern "C" int GUC_yywrap (void );
#else
extern int GUC_yywrap (void );
#endif
#endif

#ifndef yytext_ptr
static void yy_flex_strncpy (char *,yyconst char *,int );
#endif

#ifdef YY_NEED_STRLEN
static int yy_flex_strlen (yyconst char * );
#endif

#ifndef YY_NO_INPUT

#ifdef __cplusplus
static int yyinput (void );
#else
static int input (void );
#endif

#endif

/* Amount of stuff to slurp up with each read. */
#ifndef YY_READ_BUF_SIZE
#define YY_READ_BUF_SIZE 8192
#endif

/* Copy whatever the last rule matched to the standard output. */
#ifndef ECHO
/* This used to be an fputs(), but since the string might contain NUL's,
 * we now use fwrite().
 */
#define ECHO fwrite( GUC_yytext, GUC_yyleng, 1, GUC_yyout )
#endif

/* Gets input and stuffs it into "buf".  number of characters read, or YY_NULL,
 * is returned in "result".
 */
#ifndef YY_INPUT
#define YY_INPUT(buf,result,max_size) \
      if ( YY_CURRENT_BUFFER_LVALUE->yy_is_interactive ) \
            { \
            int c = '*'; \
            int n; \
            for ( n = 0; n < max_size && \
                       (c = getc( GUC_yyin )) != EOF && c != '\n'; ++n ) \
                  buf[n] = (char) c; \
            if ( c == '\n' ) \
                  buf[n++] = (char) c; \
            if ( c == EOF && ferror( GUC_yyin ) ) \
                  YY_FATAL_ERROR( "input in flex scanner failed" ); \
            result = n; \
            } \
      else \
            { \
            errno=0; \
            while ( (result = fread(buf, 1, max_size, GUC_yyin))==0 && ferror(GUC_yyin)) \
                  { \
                  if( errno != EINTR) \
                        { \
                        YY_FATAL_ERROR( "input in flex scanner failed" ); \
                        break; \
                        } \
                  errno=0; \
                  clearerr(GUC_yyin); \
                  } \
            }\
\

#endif

/* No semi-colon after return; correct usage is to write "yyterminate();" -
 * we don't want an extra ';' after the "return" because that will cause
 * some compilers to complain about unreachable statements.
 */
#ifndef yyterminate
#define yyterminate() return YY_NULL
#endif

/* Number of entries by which start-condition stack grows. */
#ifndef YY_START_STACK_INCR
#define YY_START_STACK_INCR 25
#endif

/* Report a fatal error. */
#ifndef YY_FATAL_ERROR
#define YY_FATAL_ERROR(msg) yy_fatal_error( msg )
#endif

/* end tables serialization structures and prototypes */

/* Default declaration of generated scanner - a define so the user can
 * easily add parameters.
 */
#ifndef YY_DECL
#define YY_DECL_IS_OURS 1

extern int GUC_yylex (void);

#define YY_DECL int GUC_yylex (void)
#endif /* !YY_DECL */

/* Code executed at the beginning of each rule, after GUC_yytext and GUC_yyleng
 * have been set up.
 */
#ifndef YY_USER_ACTION
#define YY_USER_ACTION
#endif

/* Code executed at the end of each rule. */
#ifndef YY_BREAK
#define YY_BREAK break;
#endif

#define YY_RULE_SETUP \
      YY_USER_ACTION

/** The main scanner function which does all the work.
 */
YY_DECL
{
      register yy_state_type yy_current_state;
      register char *yy_cp, *yy_bp;
      register int yy_act;
    
#line 90 "guc-file.l"


#line 759 "guc-file.c"

      if ( !(yy_init) )
            {
            (yy_init) = 1;

#ifdef YY_USER_INIT
            YY_USER_INIT;
#endif

            if ( ! (yy_start) )
                  (yy_start) = 1;   /* first start state */

            if ( ! GUC_yyin )
                  GUC_yyin = stdin;

            if ( ! GUC_yyout )
                  GUC_yyout = stdout;

            if ( ! YY_CURRENT_BUFFER ) {
                  GUC_yyensure_buffer_stack ();
                  YY_CURRENT_BUFFER_LVALUE =
                        GUC_yy_create_buffer(GUC_yyin,YY_BUF_SIZE );
            }

            GUC_yy_load_buffer_state( );
            }

      while ( 1 )       /* loops until end-of-file is reached */
            {
            yy_cp = (yy_c_buf_p);

            /* Support of GUC_yytext. */
            *yy_cp = (yy_hold_char);

            /* yy_bp points to the position in yy_ch_buf of the start of
             * the current run.
             */
            yy_bp = yy_cp;

            yy_current_state = (yy_start);
yy_match:
            do
                  {
                  register YY_CHAR yy_c = yy_ec[YY_SC_TO_UI(*yy_cp)];
                  if ( yy_accept[yy_current_state] )
                        {
                        (yy_last_accepting_state) = yy_current_state;
                        (yy_last_accepting_cpos) = yy_cp;
                        }
                  while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state )
                        {
                        yy_current_state = (int) yy_def[yy_current_state];
                        if ( yy_current_state >= 41 )
                              yy_c = yy_meta[(unsigned int) yy_c];
                        }
                  yy_current_state = yy_nxt[yy_base[yy_current_state] + (unsigned int) yy_c];
                  ++yy_cp;
                  }
            while ( yy_current_state != 40 );
            yy_cp = (yy_last_accepting_cpos);
            yy_current_state = (yy_last_accepting_state);

yy_find_action:
            yy_act = yy_accept[yy_current_state];

            YY_DO_BEFORE_ACTION;

do_action:  /* This label is used only to access EOF actions. */

            switch ( yy_act )
      { /* beginning of action switch */
                  case 0: /* must back up */
                  /* undo the effects of YY_DO_BEFORE_ACTION */
                  *yy_cp = (yy_hold_char);
                  yy_cp = (yy_last_accepting_cpos);
                  yy_current_state = (yy_last_accepting_state);
                  goto yy_find_action;

case 1:
/* rule 1 can match eol */
YY_RULE_SETUP
#line 92 "guc-file.l"
ConfigFileLineno++; return GUC_EOL;
      YY_BREAK
case 2:
YY_RULE_SETUP
#line 93 "guc-file.l"
/* eat whitespace */
      YY_BREAK
case 3:
YY_RULE_SETUP
#line 94 "guc-file.l"
/* eat comment (.* matches anything until newline) */
      YY_BREAK
case 4:
YY_RULE_SETUP
#line 96 "guc-file.l"
return GUC_ID;
      YY_BREAK
case 5:
YY_RULE_SETUP
#line 97 "guc-file.l"
return GUC_QUALIFIED_ID;
      YY_BREAK
case 6:
YY_RULE_SETUP
#line 98 "guc-file.l"
return GUC_STRING;
      YY_BREAK
case 7:
YY_RULE_SETUP
#line 99 "guc-file.l"
return GUC_UNQUOTED_STRING;
      YY_BREAK
case 8:
YY_RULE_SETUP
#line 100 "guc-file.l"
return GUC_INTEGER;
      YY_BREAK
case 9:
YY_RULE_SETUP
#line 101 "guc-file.l"
return GUC_REAL;
      YY_BREAK
case 10:
YY_RULE_SETUP
#line 102 "guc-file.l"
return GUC_EQUALS;
      YY_BREAK
case 11:
YY_RULE_SETUP
#line 104 "guc-file.l"
return GUC_ERROR;
      YY_BREAK
case 12:
YY_RULE_SETUP
#line 106 "guc-file.l"
YY_FATAL_ERROR( "flex scanner jammed" );
      YY_BREAK
#line 899 "guc-file.c"
case YY_STATE_EOF(INITIAL):
      yyterminate();

      case YY_END_OF_BUFFER:
            {
            /* Amount of text matched not including the EOB char. */
            int yy_amount_of_matched_text = (int) (yy_cp - (yytext_ptr)) - 1;

            /* Undo the effects of YY_DO_BEFORE_ACTION. */
            *yy_cp = (yy_hold_char);
            YY_RESTORE_YY_MORE_OFFSET

            if ( YY_CURRENT_BUFFER_LVALUE->yy_buffer_status == YY_BUFFER_NEW )
                  {
                  /* We're scanning a new file or input source.  It's
                   * possible that this happened because the user
                   * just pointed GUC_yyin at a new source and called
                   * GUC_yylex().  If so, then we have to assure
                   * consistency between YY_CURRENT_BUFFER and our
                   * globals.  Here is the right place to do so, because
                   * this is the first action (other than possibly a
                   * back-up) that will match for the new input source.
                   */
                  (yy_n_chars) = YY_CURRENT_BUFFER_LVALUE->yy_n_chars;
                  YY_CURRENT_BUFFER_LVALUE->yy_input_file = GUC_yyin;
                  YY_CURRENT_BUFFER_LVALUE->yy_buffer_status = YY_BUFFER_NORMAL;
                  }

            /* Note that here we test for yy_c_buf_p "<=" to the position
             * of the first EOB in the buffer, since yy_c_buf_p will
             * already have been incremented past the NUL character
             * (since all states make transitions on EOB to the
             * end-of-buffer state).  Contrast this with the test
             * in input().
             */
            if ( (yy_c_buf_p) <= &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[(yy_n_chars)] )
                  { /* This was really a NUL. */
                  yy_state_type yy_next_state;

                  (yy_c_buf_p) = (yytext_ptr) + yy_amount_of_matched_text;

                  yy_current_state = yy_get_previous_state(  );

                  /* Okay, we're now positioned to make the NUL
                   * transition.  We couldn't have
                   * yy_get_previous_state() go ahead and do it
                   * for us because it doesn't know how to deal
                   * with the possibility of jamming (and we don't
                   * want to build jamming into it because then it
                   * will run more slowly).
                   */

                  yy_next_state = yy_try_NUL_trans( yy_current_state );

                  yy_bp = (yytext_ptr) + YY_MORE_ADJ;

                  if ( yy_next_state )
                        {
                        /* Consume the NUL. */
                        yy_cp = ++(yy_c_buf_p);
                        yy_current_state = yy_next_state;
                        goto yy_match;
                        }

                  else
                        {
                        yy_cp = (yy_last_accepting_cpos);
                        yy_current_state = (yy_last_accepting_state);
                        goto yy_find_action;
                        }
                  }

            else switch ( yy_get_next_buffer(  ) )
                  {
                  case EOB_ACT_END_OF_FILE:
                        {
                        (yy_did_buffer_switch_on_eof) = 0;

                        if ( GUC_yywrap( ) )
                              {
                              /* Note: because we've taken care in
                               * yy_get_next_buffer() to have set up
                               * GUC_yytext, we can now set up
                               * yy_c_buf_p so that if some total
                               * hoser (like flex itself) wants to
                               * call the scanner after we return the
                               * YY_NULL, it'll still work - another
                               * YY_NULL will get returned.
                               */
                              (yy_c_buf_p) = (yytext_ptr) + YY_MORE_ADJ;

                              yy_act = YY_STATE_EOF(YY_START);
                              goto do_action;
                              }

                        else
                              {
                              if ( ! (yy_did_buffer_switch_on_eof) )
                                    YY_NEW_FILE;
                              }
                        break;
                        }

                  case EOB_ACT_CONTINUE_SCAN:
                        (yy_c_buf_p) =
                              (yytext_ptr) + yy_amount_of_matched_text;

                        yy_current_state = yy_get_previous_state(  );

                        yy_cp = (yy_c_buf_p);
                        yy_bp = (yytext_ptr) + YY_MORE_ADJ;
                        goto yy_match;

                  case EOB_ACT_LAST_MATCH:
                        (yy_c_buf_p) =
                        &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[(yy_n_chars)];

                        yy_current_state = yy_get_previous_state(  );

                        yy_cp = (yy_c_buf_p);
                        yy_bp = (yytext_ptr) + YY_MORE_ADJ;
                        goto yy_find_action;
                  }
            break;
            }

      default:
            YY_FATAL_ERROR(
                  "fatal flex scanner internal error--no action found" );
      } /* end of action switch */
            } /* end of scanning one token */
} /* end of GUC_yylex */

/* yy_get_next_buffer - try to read in a new buffer
 *
 * Returns a code representing an action:
 *    EOB_ACT_LAST_MATCH -
 *    EOB_ACT_CONTINUE_SCAN - continue scanning from current position
 *    EOB_ACT_END_OF_FILE - end of file
 */
static int yy_get_next_buffer (void)
{
      register char *dest = YY_CURRENT_BUFFER_LVALUE->yy_ch_buf;
      register char *source = (yytext_ptr);
      register int number_to_move, i;
      int ret_val;

      if ( (yy_c_buf_p) > &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[(yy_n_chars) + 1] )
            YY_FATAL_ERROR(
            "fatal flex scanner internal error--end of buffer missed" );

      if ( YY_CURRENT_BUFFER_LVALUE->yy_fill_buffer == 0 )
            { /* Don't try to fill the buffer, so this is an EOF. */
            if ( (yy_c_buf_p) - (yytext_ptr) - YY_MORE_ADJ == 1 )
                  {
                  /* We matched a single character, the EOB, so
                   * treat this as a final EOF.
                   */
                  return EOB_ACT_END_OF_FILE;
                  }

            else
                  {
                  /* We matched some text prior to the EOB, first
                   * process it.
                   */
                  return EOB_ACT_LAST_MATCH;
                  }
            }

      /* Try to read more data. */

      /* First move last chars to start of buffer. */
      number_to_move = (int) ((yy_c_buf_p) - (yytext_ptr)) - 1;

      for ( i = 0; i < number_to_move; ++i )
            *(dest++) = *(source++);

      if ( YY_CURRENT_BUFFER_LVALUE->yy_buffer_status == YY_BUFFER_EOF_PENDING )
            /* don't do the read, it's not guaranteed to return an EOF,
             * just force an EOF
             */
            YY_CURRENT_BUFFER_LVALUE->yy_n_chars = (yy_n_chars) = 0;

      else
            {
                  int num_to_read =
                  YY_CURRENT_BUFFER_LVALUE->yy_buf_size - number_to_move - 1;

            while ( num_to_read <= 0 )
                  { /* Not enough room in the buffer - grow it. */

                  /* just a shorter name for the current buffer */
                  YY_BUFFER_STATE b = YY_CURRENT_BUFFER;

                  int yy_c_buf_p_offset =
                        (int) ((yy_c_buf_p) - b->yy_ch_buf);

                  if ( b->yy_is_our_buffer )
                        {
                        int new_size = b->yy_buf_size * 2;

                        if ( new_size <= 0 )
                              b->yy_buf_size += b->yy_buf_size / 8;
                        else
                              b->yy_buf_size *= 2;

                        b->yy_ch_buf = (char *)
                              /* Include room in for 2 EOB chars. */
                              GUC_yyrealloc((void *) b->yy_ch_buf,b->yy_buf_size + 2  );
                        }
                  else
                        /* Can't grow it, we don't own it. */
                        b->yy_ch_buf = 0;

                  if ( ! b->yy_ch_buf )
                        YY_FATAL_ERROR(
                        "fatal error - scanner input buffer overflow" );

                  (yy_c_buf_p) = &b->yy_ch_buf[yy_c_buf_p_offset];

                  num_to_read = YY_CURRENT_BUFFER_LVALUE->yy_buf_size -
                                    number_to_move - 1;

                  }

            if ( num_to_read > YY_READ_BUF_SIZE )
                  num_to_read = YY_READ_BUF_SIZE;

            /* Read in more data. */
            YY_INPUT( (&YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[number_to_move]),
                  (yy_n_chars), (size_t) num_to_read );

            YY_CURRENT_BUFFER_LVALUE->yy_n_chars = (yy_n_chars);
            }

      if ( (yy_n_chars) == 0 )
            {
            if ( number_to_move == YY_MORE_ADJ )
                  {
                  ret_val = EOB_ACT_END_OF_FILE;
                  GUC_yyrestart(GUC_yyin  );
                  }

            else
                  {
                  ret_val = EOB_ACT_LAST_MATCH;
                  YY_CURRENT_BUFFER_LVALUE->yy_buffer_status =
                        YY_BUFFER_EOF_PENDING;
                  }
            }

      else
            ret_val = EOB_ACT_CONTINUE_SCAN;

      if ((yy_size_t) ((yy_n_chars) + number_to_move) > YY_CURRENT_BUFFER_LVALUE->yy_buf_size) {
            /* Extend the array by 50%, plus the number we really need. */
            yy_size_t new_size = (yy_n_chars) + number_to_move + ((yy_n_chars) >> 1);
            YY_CURRENT_BUFFER_LVALUE->yy_ch_buf = (char *) GUC_yyrealloc((void *) YY_CURRENT_BUFFER_LVALUE->yy_ch_buf,new_size  );
            if ( ! YY_CURRENT_BUFFER_LVALUE->yy_ch_buf )
                  YY_FATAL_ERROR( "out of dynamic memory in yy_get_next_buffer()" );
      }

      (yy_n_chars) += number_to_move;
      YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[(yy_n_chars)] = YY_END_OF_BUFFER_CHAR;
      YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[(yy_n_chars) + 1] = YY_END_OF_BUFFER_CHAR;

      (yytext_ptr) = &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[0];

      return ret_val;
}

/* yy_get_previous_state - get the state just before the EOB char was reached */

    static yy_state_type yy_get_previous_state (void)
{
      register yy_state_type yy_current_state;
      register char *yy_cp;
    
      yy_current_state = (yy_start);

      for ( yy_cp = (yytext_ptr) + YY_MORE_ADJ; yy_cp < (yy_c_buf_p); ++yy_cp )
            {
            register YY_CHAR yy_c = (*yy_cp ? yy_ec[YY_SC_TO_UI(*yy_cp)] : 1);
            if ( yy_accept[yy_current_state] )
                  {
                  (yy_last_accepting_state) = yy_current_state;
                  (yy_last_accepting_cpos) = yy_cp;
                  }
            while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state )
                  {
                  yy_current_state = (int) yy_def[yy_current_state];
                  if ( yy_current_state >= 41 )
                        yy_c = yy_meta[(unsigned int) yy_c];
                  }
            yy_current_state = yy_nxt[yy_base[yy_current_state] + (unsigned int) yy_c];
            }

      return yy_current_state;
}

/* yy_try_NUL_trans - try to make a transition on the NUL character
 *
 * synopsis
 *    next_state = yy_try_NUL_trans( current_state );
 */
    static yy_state_type yy_try_NUL_trans  (yy_state_type yy_current_state )
{
      register int yy_is_jam;
      register char *yy_cp = (yy_c_buf_p);

      register YY_CHAR yy_c = 1;
      if ( yy_accept[yy_current_state] )
            {
            (yy_last_accepting_state) = yy_current_state;
            (yy_last_accepting_cpos) = yy_cp;
            }
      while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state )
            {
            yy_current_state = (int) yy_def[yy_current_state];
            if ( yy_current_state >= 41 )
                  yy_c = yy_meta[(unsigned int) yy_c];
            }
      yy_current_state = yy_nxt[yy_base[yy_current_state] + (unsigned int) yy_c];
      yy_is_jam = (yy_current_state == 40);

      return yy_is_jam ? 0 : yy_current_state;
}

#ifndef YY_NO_INPUT
#ifdef __cplusplus
    static int yyinput (void)
#else
    static int input  (void)
#endif

{
      int c;
    
      *(yy_c_buf_p) = (yy_hold_char);

      if ( *(yy_c_buf_p) == YY_END_OF_BUFFER_CHAR )
            {
            /* yy_c_buf_p now points to the character we want to return.
             * If this occurs *before* the EOB characters, then it's a
             * valid NUL; if not, then we've hit the end of the buffer.
             */
            if ( (yy_c_buf_p) < &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[(yy_n_chars)] )
                  /* This was really a NUL. */
                  *(yy_c_buf_p) = '\0';

            else
                  { /* need more input */
                  int offset = (yy_c_buf_p) - (yytext_ptr);
                  ++(yy_c_buf_p);

                  switch ( yy_get_next_buffer(  ) )
                        {
                        case EOB_ACT_LAST_MATCH:
                              /* This happens because yy_g_n_b()
                               * sees that we've accumulated a
                               * token and flags that we need to
                               * try matching the token before
                               * proceeding.  But for input(),
                               * there's no matching to consider.
                               * So convert the EOB_ACT_LAST_MATCH
                               * to EOB_ACT_END_OF_FILE.
                               */

                              /* Reset buffer status. */
                              GUC_yyrestart(GUC_yyin );

                              /*FALLTHROUGH*/

                        case EOB_ACT_END_OF_FILE:
                              {
                              if ( GUC_yywrap( ) )
                                    return EOF;

                              if ( ! (yy_did_buffer_switch_on_eof) )
                                    YY_NEW_FILE;
#ifdef __cplusplus
                              return yyinput();
#else
                              return input();
#endif
                              }

                        case EOB_ACT_CONTINUE_SCAN:
                              (yy_c_buf_p) = (yytext_ptr) + offset;
                              break;
                        }
                  }
            }

      c = *(unsigned char *) (yy_c_buf_p);      /* cast for 8-bit char's */
      *(yy_c_buf_p) = '\0';   /* preserve GUC_yytext */
      (yy_hold_char) = *++(yy_c_buf_p);

      return c;
}
#endif      /* ifndef YY_NO_INPUT */

/** Immediately switch to a different input stream.
 * @param input_file A readable stream.
 * 
 * @note This function does not reset the start condition to @c INITIAL .
 */
    void GUC_yyrestart  (FILE * input_file )
{
    
      if ( ! YY_CURRENT_BUFFER ){
        GUC_yyensure_buffer_stack ();
            YY_CURRENT_BUFFER_LVALUE =
            GUC_yy_create_buffer(GUC_yyin,YY_BUF_SIZE );
      }

      GUC_yy_init_buffer(YY_CURRENT_BUFFER,input_file );
      GUC_yy_load_buffer_state( );
}

/** Switch to a different input buffer.
 * @param new_buffer The new input buffer.
 * 
 */
    void GUC_yy_switch_to_buffer  (YY_BUFFER_STATE  new_buffer )
{
    
      /* TODO. We should be able to replace this entire function body
       * with
       *          GUC_yypop_buffer_state();
       *          GUC_yypush_buffer_state(new_buffer);
     */
      GUC_yyensure_buffer_stack ();
      if ( YY_CURRENT_BUFFER == new_buffer )
            return;

      if ( YY_CURRENT_BUFFER )
            {
            /* Flush out information for old buffer. */
            *(yy_c_buf_p) = (yy_hold_char);
            YY_CURRENT_BUFFER_LVALUE->yy_buf_pos = (yy_c_buf_p);
            YY_CURRENT_BUFFER_LVALUE->yy_n_chars = (yy_n_chars);
            }

      YY_CURRENT_BUFFER_LVALUE = new_buffer;
      GUC_yy_load_buffer_state( );

      /* We don't actually know whether we did this switch during
       * EOF (GUC_yywrap()) processing, but the only time this flag
       * is looked at is after GUC_yywrap() is called, so it's safe
       * to go ahead and always set it.
       */
      (yy_did_buffer_switch_on_eof) = 1;
}

static void GUC_yy_load_buffer_state  (void)
{
      (yy_n_chars) = YY_CURRENT_BUFFER_LVALUE->yy_n_chars;
      (yytext_ptr) = (yy_c_buf_p) = YY_CURRENT_BUFFER_LVALUE->yy_buf_pos;
      GUC_yyin = YY_CURRENT_BUFFER_LVALUE->yy_input_file;
      (yy_hold_char) = *(yy_c_buf_p);
}

/** Allocate and initialize an input buffer state.
 * @param file A readable stream.
 * @param size The character buffer size in bytes. When in doubt, use @c YY_BUF_SIZE.
 * 
 * @return the allocated buffer state.
 */
    YY_BUFFER_STATE GUC_yy_create_buffer  (FILE * file, int  size )
{
      YY_BUFFER_STATE b;
    
      b = (YY_BUFFER_STATE) GUC_yyalloc(sizeof( struct yy_buffer_state )  );
      if ( ! b )
            YY_FATAL_ERROR( "out of dynamic memory in GUC_yy_create_buffer()" );

      b->yy_buf_size = size;

      /* yy_ch_buf has to be 2 characters longer than the size given because
       * we need to put in 2 end-of-buffer characters.
       */
      b->yy_ch_buf = (char *) GUC_yyalloc(b->yy_buf_size + 2  );
      if ( ! b->yy_ch_buf )
            YY_FATAL_ERROR( "out of dynamic memory in GUC_yy_create_buffer()" );

      b->yy_is_our_buffer = 1;

      GUC_yy_init_buffer(b,file );

      return b;
}

/** Destroy the buffer.
 * @param b a buffer created with GUC_yy_create_buffer()
 * 
 */
    void GUC_yy_delete_buffer (YY_BUFFER_STATE  b )
{
    
      if ( ! b )
            return;

      if ( b == YY_CURRENT_BUFFER ) /* Not sure if we should pop here. */
            YY_CURRENT_BUFFER_LVALUE = (YY_BUFFER_STATE) 0;

      if ( b->yy_is_our_buffer )
            GUC_yyfree((void *) b->yy_ch_buf  );

      GUC_yyfree((void *) b  );
}

/* Initializes or reinitializes a buffer.
 * This function is sometimes called more than once on the same buffer,
 * such as during a GUC_yyrestart() or at EOF.
 */
    static void GUC_yy_init_buffer  (YY_BUFFER_STATE  b, FILE * file )

{
      int oerrno = errno;
    
      GUC_yy_flush_buffer(b );

      b->yy_input_file = file;
      b->yy_fill_buffer = 1;

    /* If b is the current buffer, then GUC_yy_init_buffer was _probably_
     * called from GUC_yyrestart() or through yy_get_next_buffer.
     * In that case, we don't want to reset the lineno or column.
     */
    if (b != YY_CURRENT_BUFFER){
        b->yy_bs_lineno = 1;
        b->yy_bs_column = 0;
    }

        b->yy_is_interactive = 0;
    
      errno = oerrno;
}

/** Discard all buffered characters. On the next scan, YY_INPUT will be called.
 * @param b the buffer state to be flushed, usually @c YY_CURRENT_BUFFER.
 * 
 */
    void GUC_yy_flush_buffer (YY_BUFFER_STATE  b )
{
      if ( ! b )
            return;

      b->yy_n_chars = 0;

      /* We always need two end-of-buffer characters.  The first causes
       * a transition to the end-of-buffer state.  The second causes
       * a jam in that state.
       */
      b->yy_ch_buf[0] = YY_END_OF_BUFFER_CHAR;
      b->yy_ch_buf[1] = YY_END_OF_BUFFER_CHAR;

      b->yy_buf_pos = &b->yy_ch_buf[0];

      b->yy_at_bol = 1;
      b->yy_buffer_status = YY_BUFFER_NEW;

      if ( b == YY_CURRENT_BUFFER )
            GUC_yy_load_buffer_state( );
}

/** Pushes the new state onto the stack. The new state becomes
 *  the current state. This function will allocate the stack
 *  if necessary.
 *  @param new_buffer The new state.
 *  
 */
void GUC_yypush_buffer_state (YY_BUFFER_STATE new_buffer )
{
      if (new_buffer == NULL)
            return;

      GUC_yyensure_buffer_stack();

      /* This block is copied from GUC_yy_switch_to_buffer. */
      if ( YY_CURRENT_BUFFER )
            {
            /* Flush out information for old buffer. */
            *(yy_c_buf_p) = (yy_hold_char);
            YY_CURRENT_BUFFER_LVALUE->yy_buf_pos = (yy_c_buf_p);
            YY_CURRENT_BUFFER_LVALUE->yy_n_chars = (yy_n_chars);
            }

      /* Only push if top exists. Otherwise, replace top. */
      if (YY_CURRENT_BUFFER)
            (yy_buffer_stack_top)++;
      YY_CURRENT_BUFFER_LVALUE = new_buffer;

      /* copied from GUC_yy_switch_to_buffer. */
      GUC_yy_load_buffer_state( );
      (yy_did_buffer_switch_on_eof) = 1;
}

/** Removes and deletes the top of the stack, if present.
 *  The next element becomes the new top.
 *  
 */
void GUC_yypop_buffer_state (void)
{
      if (!YY_CURRENT_BUFFER)
            return;

      GUC_yy_delete_buffer(YY_CURRENT_BUFFER );
      YY_CURRENT_BUFFER_LVALUE = NULL;
      if ((yy_buffer_stack_top) > 0)
            --(yy_buffer_stack_top);

      if (YY_CURRENT_BUFFER) {
            GUC_yy_load_buffer_state( );
            (yy_did_buffer_switch_on_eof) = 1;
      }
}

/* Allocates the stack if it does not exist.
 *  Guarantees space for at least one push.
 */
static void GUC_yyensure_buffer_stack (void)
{
      int num_to_alloc;
    
      if (!(yy_buffer_stack)) {

            /* First allocation is just for 2 elements, since we don't know if this
             * scanner will even need a stack. We use 2 instead of 1 to avoid an
             * immediate realloc on the next call.
         */
            num_to_alloc = 1;
            (yy_buffer_stack) = (struct yy_buffer_state**)GUC_yyalloc
                                                (num_to_alloc * sizeof(struct yy_buffer_state*)
                                                );
            if ( ! (yy_buffer_stack) )
                  YY_FATAL_ERROR( "out of dynamic memory in GUC_yyensure_buffer_stack()" );
                                                  
            memset((yy_buffer_stack), 0, num_to_alloc * sizeof(struct yy_buffer_state*));
                        
            (yy_buffer_stack_max) = num_to_alloc;
            (yy_buffer_stack_top) = 0;
            return;
      }

      if ((yy_buffer_stack_top) >= ((yy_buffer_stack_max)) - 1){

            /* Increase the buffer to prepare for a possible push. */
            int grow_size = 8 /* arbitrary grow size */;

            num_to_alloc = (yy_buffer_stack_max) + grow_size;
            (yy_buffer_stack) = (struct yy_buffer_state**)GUC_yyrealloc
                                                ((yy_buffer_stack),
                                                num_to_alloc * sizeof(struct yy_buffer_state*)
                                                );
            if ( ! (yy_buffer_stack) )
                  YY_FATAL_ERROR( "out of dynamic memory in GUC_yyensure_buffer_stack()" );

            /* zero only the new slots.*/
            memset((yy_buffer_stack) + (yy_buffer_stack_max), 0, grow_size * sizeof(struct yy_buffer_state*));
            (yy_buffer_stack_max) = num_to_alloc;
      }
}

/** Setup the input buffer state to scan directly from a user-specified character buffer.
 * @param base the character buffer
 * @param size the size in bytes of the character buffer
 * 
 * @return the newly allocated buffer state object. 
 */
YY_BUFFER_STATE GUC_yy_scan_buffer  (char * base, yy_size_t  size )
{
      YY_BUFFER_STATE b;
    
      if ( size < 2 ||
           base[size-2] != YY_END_OF_BUFFER_CHAR ||
           base[size-1] != YY_END_OF_BUFFER_CHAR )
            /* They forgot to leave room for the EOB's. */
            return 0;

      b = (YY_BUFFER_STATE) GUC_yyalloc(sizeof( struct yy_buffer_state )  );
      if ( ! b )
            YY_FATAL_ERROR( "out of dynamic memory in GUC_yy_scan_buffer()" );

      b->yy_buf_size = size - 2;    /* "- 2" to take care of EOB's */
      b->yy_buf_pos = b->yy_ch_buf = base;
      b->yy_is_our_buffer = 0;
      b->yy_input_file = 0;
      b->yy_n_chars = b->yy_buf_size;
      b->yy_is_interactive = 0;
      b->yy_at_bol = 1;
      b->yy_fill_buffer = 0;
      b->yy_buffer_status = YY_BUFFER_NEW;

      GUC_yy_switch_to_buffer(b  );

      return b;
}

/** Setup the input buffer state to scan a string. The next call to GUC_yylex() will
 * scan from a @e copy of @a str.
 * @param yystr a NUL-terminated string to scan
 * 
 * @return the newly allocated buffer state object.
 * @note If you want to scan bytes that may contain NUL values, then use
 *       GUC_yy_scan_bytes() instead.
 */
YY_BUFFER_STATE GUC_yy_scan_string (yyconst char * yystr )
{
    
      return GUC_yy_scan_bytes(yystr,strlen(yystr) );
}

/** Setup the input buffer state to scan the given bytes. The next call to GUC_yylex() will
 * scan from a @e copy of @a bytes.
 * @param bytes the byte buffer to scan
 * @param len the number of bytes in the buffer pointed to by @a bytes.
 * 
 * @return the newly allocated buffer state object.
 */
YY_BUFFER_STATE GUC_yy_scan_bytes  (yyconst char * yybytes, int  _yybytes_len )
{
      YY_BUFFER_STATE b;
      char *buf;
      yy_size_t n;
      int i;
    
      /* Get memory for full buffer, including space for trailing EOB's. */
      n = _yybytes_len + 2;
      buf = (char *) GUC_yyalloc(n  );
      if ( ! buf )
            YY_FATAL_ERROR( "out of dynamic memory in GUC_yy_scan_bytes()" );

      for ( i = 0; i < _yybytes_len; ++i )
            buf[i] = yybytes[i];

      buf[_yybytes_len] = buf[_yybytes_len+1] = YY_END_OF_BUFFER_CHAR;

      b = GUC_yy_scan_buffer(buf,n );
      if ( ! b )
            YY_FATAL_ERROR( "bad buffer in GUC_yy_scan_bytes()" );

      /* It's okay to grow etc. this buffer, and we should throw it
       * away when we're done.
       */
      b->yy_is_our_buffer = 1;

      return b;
}

#ifndef YY_EXIT_FAILURE
#define YY_EXIT_FAILURE 2
#endif

static void yy_fatal_error (yyconst char* msg )
{
      (void) fprintf( stderr, "%s\n", msg );
      exit( YY_EXIT_FAILURE );
}

/* Redefine yyless() so it works in section 3 code. */

#undef yyless
#define yyless(n) \
      do \
            { \
            /* Undo effects of setting up GUC_yytext. */ \
        int yyless_macro_arg = (n); \
        YY_LESS_LINENO(yyless_macro_arg);\
            GUC_yytext[GUC_yyleng] = (yy_hold_char); \
            (yy_c_buf_p) = GUC_yytext + yyless_macro_arg; \
            (yy_hold_char) = *(yy_c_buf_p); \
            *(yy_c_buf_p) = '\0'; \
            GUC_yyleng = yyless_macro_arg; \
            } \
      while ( 0 )

/* Accessor  methods (get/set functions) to struct members. */

/** Get the current line number.
 * 
 */
int GUC_yyget_lineno  (void)
{
        
    return GUC_yylineno;
}

/** Get the input stream.
 * 
 */
FILE *GUC_yyget_in  (void)
{
        return GUC_yyin;
}

/** Get the output stream.
 * 
 */
FILE *GUC_yyget_out  (void)
{
        return GUC_yyout;
}

/** Get the length of the current token.
 * 
 */
int GUC_yyget_leng  (void)
{
        return GUC_yyleng;
}

/** Get the current token.
 * 
 */

char *GUC_yyget_text  (void)
{
        return GUC_yytext;
}

/** Set the current line number.
 * @param line_number
 * 
 */
void GUC_yyset_lineno (int  line_number )
{
    
    GUC_yylineno = line_number;
}

/** Set the input stream. This does not discard the current
 * input buffer.
 * @param in_str A readable stream.
 * 
 * @see GUC_yy_switch_to_buffer
 */
void GUC_yyset_in (FILE *  in_str )
{
        GUC_yyin = in_str ;
}

void GUC_yyset_out (FILE *  out_str )
{
        GUC_yyout = out_str ;
}

int GUC_yyget_debug  (void)
{
        return GUC_yy_flex_debug;
}

void GUC_yyset_debug (int  bdebug )
{
        GUC_yy_flex_debug = bdebug ;
}

static int yy_init_globals (void)
{
        /* Initialization is the same as for the non-reentrant scanner.
     * This function is called from GUC_yylex_destroy(), so don't allocate here.
     */

    (yy_buffer_stack) = 0;
    (yy_buffer_stack_top) = 0;
    (yy_buffer_stack_max) = 0;
    (yy_c_buf_p) = (char *) 0;
    (yy_init) = 0;
    (yy_start) = 0;

/* Defined in main.c */
#ifdef YY_STDINIT
    GUC_yyin = stdin;
    GUC_yyout = stdout;
#else
    GUC_yyin = (FILE *) 0;
    GUC_yyout = (FILE *) 0;
#endif

    /* For future reference: Set errno on error, since we are called by
     * GUC_yylex_init()
     */
    return 0;
}

/* GUC_yylex_destroy is for both reentrant and non-reentrant scanners. */
int GUC_yylex_destroy  (void)
{
    
    /* Pop the buffer stack, destroying each element. */
      while(YY_CURRENT_BUFFER){
            GUC_yy_delete_buffer(YY_CURRENT_BUFFER  );
            YY_CURRENT_BUFFER_LVALUE = NULL;
            GUC_yypop_buffer_state();
      }

      /* Destroy the stack itself. */
      GUC_yyfree((yy_buffer_stack) );
      (yy_buffer_stack) = NULL;

    /* Reset the globals. This is important in a non-reentrant scanner so the next time
     * GUC_yylex() is called, initialization will occur. */
    yy_init_globals( );

    return 0;
}

/*
 * Internal utility routines.
 */

#ifndef yytext_ptr
static void yy_flex_strncpy (char* s1, yyconst char * s2, int n )
{
      register int i;
      for ( i = 0; i < n; ++i )
            s1[i] = s2[i];
}
#endif

#ifdef YY_NEED_STRLEN
static int yy_flex_strlen (yyconst char * s )
{
      register int n;
      for ( n = 0; s[n]; ++n )
            ;

      return n;
}
#endif

void *GUC_yyalloc (yy_size_t  size )
{
      return (void *) malloc( size );
}

void *GUC_yyrealloc  (void * ptr, yy_size_t  size )
{
      /* The cast to (char *) in the following accommodates both
       * implementations that use char* generic pointers, and those
       * that use void* generic pointers.  It works with the latter
       * because both ANSI C and C++ allow castless assignment from
       * any pointer type to void*, and deal with argument conversions
       * as though doing an assignment.
       */
      return (void *) realloc( (char *) ptr, size );
}

void GUC_yyfree (void * ptr )
{
      free( (char *) ptr );   /* see GUC_yyrealloc() for (char *) cast */
}

#define YYTABLES_NAME "yytables"

#line 106 "guc-file.l"





/*
 * Exported function to read and process the configuration file. The
 * parameter indicates in what context the file is being read --- either
 * postmaster startup (including standalone-backend startup) or SIGHUP.
 * All options mentioned in the configuration file are set to new values.
 * If an error occurs, no values will be changed.
 */
void
ProcessConfigFile(GucContext context)
{
      int               elevel;
      struct name_value_pair *item, *head, *tail;
      char     *cvc = NULL;
      struct config_string *cvc_struct;
      const char *envvar;
      int               i;

      Assert(context == PGC_POSTMASTER || context == PGC_SIGHUP);

      if (context == PGC_SIGHUP)
      {
            /*
             * To avoid cluttering the log, only the postmaster bleats loudly
             * about problems with the config file.
             */
            elevel = IsUnderPostmaster ? DEBUG2 : LOG;
      }
      else
            elevel = ERROR;

      /* Parse the file into a list of option names and values */
      head = tail = NULL;

      if (!ParseConfigFile(ConfigFileName, NULL,
                                     0, context, elevel,
                                     &head, &tail))
            goto cleanup_list;

      /*
       * We need the proposed new value of custom_variable_classes to check
       * custom variables with.  ParseConfigFile ensured that if it's in
       * the file, it's first in the list.  But first check to see if we
       * have an active value from the command line, which should override
       * the file in any case.  (Since there's no relevant env var, the
       * only possible nondefault sources are the file and ARGV.)
       */
      cvc_struct = (struct config_string *)
            find_option("custom_variable_classes", false, elevel);
      if (cvc_struct && cvc_struct->gen.reset_source > PGC_S_FILE)
      {
            cvc = guc_strdup(elevel, cvc_struct->reset_val);
            if (cvc == NULL)
                  goto cleanup_list;
      }
      else if (head != NULL &&
                   guc_name_compare(head->name, "custom_variable_classes") == 0)
      {
            /*
             * Need to canonicalize the value via the assign hook.  Casting away
             * const is a bit ugly, but we know the result is malloc'd.
             */
            cvc = (char *) assign_custom_variable_classes(head->value,
                                                                                false, PGC_S_FILE);
            if (cvc == NULL)
            {
                  ereport(elevel,
                              (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                               errmsg("invalid value for parameter \"%s\": \"%s\"",
                                          head->name, head->value)));
                  goto cleanup_list;
            }
      }

      /*
       * Mark all extant GUC variables as not present in the config file.
       * We need this so that we can tell below which ones have been removed
       * from the file since we last processed it.
       */
      for (i = 0; i < num_guc_variables; i++)
      {
            struct config_generic *gconf = guc_variables[i];

            gconf->status &= ~GUC_IS_IN_FILE;
      }

      /*
       * Check if all options are valid.  As a side-effect, the GUC_IS_IN_FILE
       * flag is set on each GUC variable mentioned in the list.
       */
      for (item = head; item; item = item->next)
      {
            char *sep = strchr(item->name, GUC_QUALIFIER_SEPARATOR);

            if (sep)
            {
                  /*
                   * We have to consider three cases for custom variables:
                   *
                   * 1. The class name is not valid according to the (new) setting
                   * of custom_variable_classes.  If so, reject.  We don't care
                   * which side is at fault.
                   */
                  if (!is_custom_class(item->name, sep - item->name, cvc))
                  {
                        ereport(elevel,
                                    (errcode(ERRCODE_UNDEFINED_OBJECT),
                                     errmsg("unrecognized configuration parameter \"%s\"",
                                                item->name)));
                        goto cleanup_list;
                  }
                  /*
                   * 2. There is no GUC entry.  If we called set_config_option then
                   * it would make a placeholder, which we don't want to do yet,
                   * since we could still fail further down the list.  Do nothing
                   * (assuming that making the placeholder will succeed later).
                   */
                  if (find_option(item->name, false, elevel) == NULL)
                        continue;
                  /*
                   * 3. There is already a GUC entry (either real or placeholder) for
                   * the variable.  In this case we should let set_config_option
                   * check it, since the assignment could well fail if it's a real
                   * entry.
                   */
            }

            if (!set_config_option(item->name, item->value, context,
                                             PGC_S_FILE, GUC_ACTION_SET, false))
                  goto cleanup_list;
      }

      /*
       * Check for variables having been removed from the config file, and
       * revert their reset values (and perhaps also effective values) to the
       * boot-time defaults.  If such a variable can't be changed after startup,
       * just throw a warning and continue.  (This is analogous to the fact that
       * set_config_option only throws a warning for a new but different value.
       * If we wanted to make it a hard error, we'd need an extra pass over the
       * list so that we could throw the error before starting to apply
       * changes.)
       */
      for (i = 0; i < num_guc_variables; i++)
      {
            struct config_generic *gconf = guc_variables[i];
            GucStack   *stack;

            if (gconf->reset_source != PGC_S_FILE ||
                  (gconf->status & GUC_IS_IN_FILE))
                  continue;
            if (gconf->context < PGC_SIGHUP)
            {
                  ereport(elevel,
                              (errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
                               errmsg("attempted change of parameter \"%s\" ignored",
                                          gconf->name),
                               errdetail("This parameter cannot be changed after server start.")));
                  continue;
            }

            /*
             * Reset any "file" sources to "default", else set_config_option
             * will not override those settings.
             */
            if (gconf->reset_source == PGC_S_FILE)
                  gconf->reset_source = PGC_S_DEFAULT;
            if (gconf->source == PGC_S_FILE)
                  gconf->source = PGC_S_DEFAULT;
            for (stack = gconf->stack; stack; stack = stack->prev)
            {
                  if (stack->source == PGC_S_FILE)
                        stack->source = PGC_S_DEFAULT;
            }

            /* Now we can re-apply the wired-in default */
            set_config_option(gconf->name, NULL, context, PGC_S_DEFAULT,
                                      GUC_ACTION_SET, true);
      }

      /*
       * Restore any variables determined by environment variables.  This
       * is a no-op except in the case where one of these had been in the
       * config file and is now removed.  PGC_S_ENV_VAR will override the
       * wired-in default we just applied, but cannot override any other source.
       *
       * Keep this list in sync with InitializeGUCOptions()!
       * PGPORT can be ignored, because it cannot be changed without restart.
       * We assume rlimit hasn't changed, either.
       */
      envvar = getenv("PGDATESTYLE");
      if (envvar != NULL)
            set_config_option("datestyle", envvar, PGC_POSTMASTER,
                                      PGC_S_ENV_VAR, GUC_ACTION_SET, true);

      envvar = getenv("PGCLIENTENCODING");
      if (envvar != NULL)
            set_config_option("client_encoding", envvar, PGC_POSTMASTER,
                                      PGC_S_ENV_VAR, GUC_ACTION_SET, true);


      /* If we got here all the options checked out okay, so apply them. */
      for (item = head; item; item = item->next)
      {
            if (set_config_option(item->name, item->value, context,
                                                 PGC_S_FILE, GUC_ACTION_SET, true))
            {
                  set_config_sourcefile(item->name, item->filename,
                                                  item->sourceline);
            }
      }

      /* Remember when we last successfully loaded the config file. */
      PgReloadTime = GetCurrentTimestamp();

 cleanup_list:
      free_name_value_list(head);
      if (cvc)
            free(cvc);
}


/*
 * Read and parse a single configuration file.  This function recurses
 * to handle "include" directives.
 *
 * Input parameters:
 *    config_file: absolute or relative path of file to read
 *    calling_file: absolute path of file containing the "include" directive,
 *          or NULL at outer level (config_file must be absolute at outer level)
 *    depth: recursion depth (used only to prevent infinite recursion)
 *    context: GucContext passed to ProcessConfigFile()
 *    elevel: error logging level determined by ProcessConfigFile()
 * Output parameters:
 *    head_p, tail_p: head and tail of linked list of name/value pairs
 *
 * *head_p and *tail_p must be initialized to NULL before calling the outer
 * recursion level.  On exit, they contain a list of name-value pairs read
 * from the input file(s).
 *
 * Returns TRUE if successful, FALSE if an error occurred.  The error has
 * already been ereport'd, it is only necessary for the caller to clean up
 * its own state and release the name/value pairs list.
 *
 * Note: if elevel >= ERROR then an error will not return control to the
 * caller, and internal state such as open files will not be cleaned up.
 * This case occurs only during postmaster or standalone-backend startup,
 * where an error will lead to immediate process exit anyway; so there is
 * no point in contorting the code so it can clean up nicely.
 */
static bool
ParseConfigFile(const char *config_file, const char *calling_file,
                        int depth, GucContext context, int elevel,
                        struct name_value_pair **head_p,
                        struct name_value_pair **tail_p)
{
      bool        OK = true;
      char        abs_path[MAXPGPATH];
      FILE     *fp;
      YY_BUFFER_STATE lex_buffer;
      int               token;

      /*
       * Reject too-deep include nesting depth.  This is just a safety check
       * to avoid dumping core due to stack overflow if an include file loops
       * back to itself.  The maximum nesting depth is pretty arbitrary.
       */
      if (depth > 10)
      {
            ereport(elevel,
                        (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
                         errmsg("could not open configuration file \"%s\": maximum nesting depth exceeded",
                                    config_file)));
            return false;
      }

      /*
       * If config_file is a relative path, convert to absolute.  We consider
       * it to be relative to the directory holding the calling file.
       */
      if (!is_absolute_path(config_file))
      {
            Assert(calling_file != NULL);
            strlcpy(abs_path, calling_file, sizeof(abs_path));
            get_parent_directory(abs_path);
            join_path_components(abs_path, abs_path, config_file);
            canonicalize_path(abs_path);
            config_file = abs_path;
      }

      fp = AllocateFile(config_file, "r");
      if (!fp)
      {
            ereport(elevel,
                        (errcode_for_file_access(),
                         errmsg("could not open configuration file \"%s\": %m",
                                    config_file)));
            return false;
      }

      /*
       * Parse
       */
      lex_buffer = GUC_yy_create_buffer(fp,YY_BUF_SIZE);
      GUC_yy_switch_to_buffer(lex_buffer);

      ConfigFileLineno = 1;

      /* This loop iterates once per logical line */
      while ((token = GUC_yylex()))
      {
            char     *opt_name, *opt_value;
            struct name_value_pair *item;

            if (token == GUC_EOL)   /* empty or comment line */
                  continue;

            /* first token on line is option name */
            if (token != GUC_ID && token != GUC_QUALIFIED_ID)
                  goto parse_error;
            opt_name = pstrdup(GUC_yytext);

            /* next we have an optional equal sign; discard if present */
            token = GUC_yylex();
            if (token == GUC_EQUALS)
                  token = GUC_yylex();

            /* now we must have the option value */
            if (token != GUC_ID &&
                  token != GUC_STRING && 
                  token != GUC_INTEGER && 
                  token != GUC_REAL && 
                  token != GUC_UNQUOTED_STRING)
                  goto parse_error;
            if (token == GUC_STRING)      /* strip quotes and escapes */
                  opt_value = GUC_scanstr(GUC_yytext);
            else
                  opt_value = pstrdup(GUC_yytext);

            /* now we'd like an end of line, or possibly EOF */
            token = GUC_yylex();
            if (token != GUC_EOL)
            {
                  if (token != 0)
                        goto parse_error;
                  /* treat EOF like \n for line numbering purposes, cf bug 4752 */
                  ConfigFileLineno++;
            }

            /* OK, process the option name and value */
            if (guc_name_compare(opt_name, "include") == 0)
            {
                  /*
                   * An include directive isn't a variable and should be processed
                   * immediately.
                   */
                  unsigned int save_ConfigFileLineno = ConfigFileLineno;

                  if (!ParseConfigFile(opt_value, config_file,
                                                 depth + 1, context, elevel,
                                                 head_p, tail_p))
                  {
                        pfree(opt_name);
                        pfree(opt_value);
                        OK = false;
                        goto cleanup_exit;
                  }
                  GUC_yy_switch_to_buffer(lex_buffer);
                  ConfigFileLineno = save_ConfigFileLineno;
                  pfree(opt_name);
                  pfree(opt_value);
            }
            else if (guc_name_compare(opt_name, "custom_variable_classes") == 0)
            {
                  /*
                   * This variable must be processed first as it controls
                   * the validity of other variables; so it goes at the head
                   * of the result list.  If we already found a value for it,
                   * replace with this one.
                   */
                  item = *head_p;
                  if (item != NULL &&
                        guc_name_compare(item->name, "custom_variable_classes") == 0)
                  {
                        /* replace existing head item */
                        pfree(item->name);
                        pfree(item->value);
                        item->name = opt_name;
                        item->value = opt_value;
                        item->filename = pstrdup(config_file);
                        item->sourceline = ConfigFileLineno-1;
                  }
                  else
                  {
                        /* prepend to list */
                        item = palloc(sizeof *item);
                        item->name = opt_name;
                        item->value = opt_value;
                        item->filename = pstrdup(config_file);
                        item->sourceline = ConfigFileLineno-1;
                        item->next = *head_p;
                        *head_p = item;
                        if (*tail_p == NULL)
                              *tail_p = item;
                  }
            }
            else
            {
                  /* ordinary variable, append to list */
                  item = palloc(sizeof *item);
                  item->name = opt_name;
                  item->value = opt_value;
                  item->filename = pstrdup(config_file);
                  item->sourceline = ConfigFileLineno-1;
                  item->next = NULL;
                  if (*head_p == NULL)
                        *head_p = item;
                  else
                        (*tail_p)->next = item;
                  *tail_p = item;
            }

            /* break out of loop if read EOF, else loop for next line */
            if (token == 0)
                  break;
      }

      /* successful completion of parsing */
      goto cleanup_exit;

 parse_error:
      if (token == GUC_EOL || token == 0)
            ereport(elevel,
                        (errcode(ERRCODE_SYNTAX_ERROR),
                         errmsg("syntax error in file \"%s\" line %u, near end of line",
                                    config_file, ConfigFileLineno - 1)));
      else
            ereport(elevel,
                        (errcode(ERRCODE_SYNTAX_ERROR),
                         errmsg("syntax error in file \"%s\" line %u, near token \"%s\"", 
                                    config_file, ConfigFileLineno, GUC_yytext)));
      OK = false;

cleanup_exit:
      GUC_yy_delete_buffer(lex_buffer);
      FreeFile(fp);
      return OK;
}


/*
 * Free a list of name/value pairs, including the names and the values
 */
static void
free_name_value_list(struct name_value_pair *list)
{
      struct name_value_pair *item;

      item = list;
      while (item)
      {
            struct name_value_pair *next = item->next;

            pfree(item->name);
            pfree(item->value);
            pfree(item->filename);
            pfree(item);
            item = next;
      }
}


/*
 *          scanstr
 *
 * Strip the quotes surrounding the given string, and collapse any embedded
 * '' sequences and backslash escapes.
 *
 * the string returned is palloc'd and should eventually be pfree'd by the
 * caller.
 */
static char *
GUC_scanstr(const char *s)
{
      char     *newStr;
      int               len,
                        i,
                        j;

      Assert(s != NULL && s[0] == '\'');
      len = strlen(s);
      Assert(len >= 2);
      Assert(s[len-1] == '\'');

      /* Skip the leading quote; we'll handle the trailing quote below */
      s++, len--;

      /* Since len still includes trailing quote, this is enough space */
      newStr = palloc(len);

      for (i = 0, j = 0; i < len; i++)
      {
            if (s[i] == '\\')
            {
                  i++;
                  switch (s[i])
                  {
                        case 'b':
                              newStr[j] = '\b';
                              break;
                        case 'f':
                              newStr[j] = '\f';
                              break;
                        case 'n':
                              newStr[j] = '\n';
                              break;
                        case 'r':
                              newStr[j] = '\r';
                              break;
                        case 't':
                              newStr[j] = '\t';
                              break;
                        case '0':
                        case '1':
                        case '2':
                        case '3':
                        case '4':
                        case '5':
                        case '6':
                        case '7':
                              {
                                    int               k;
                                    long        octVal = 0;

                                    for (k = 0;
                                           s[i + k] >= '0' && s[i + k] <= '7' && k < 3;
                                           k++)
                                          octVal = (octVal << 3) + (s[i + k] - '0');
                                    i += k - 1;
                                    newStr[j] = ((char) octVal);
                              }
                              break;
                        default:
                              newStr[j] = s[i];
                              break;
                  }                             /* switch */
            }
            else if (s[i] == '\'' && s[i+1] == '\'')
            {
                  /* doubled quote becomes just one quote */
                  newStr[j] = s[++i];
            }
            else
                  newStr[j] = s[i];
            j++;
      }

      /* We copied the ending quote to newStr, so replace with \0 */
      Assert(j > 0 && j <= len);
      newStr[--j] = '\0';

      return newStr;
}


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