#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 39
#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;

/* 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 /* ! C99 */

#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
#ifdef __ia64__
/* On IA-64, the buffer size is 16k, not 8k.
 * Moreover, YY_BUF_SIZE is 2*YY_READ_BUF_SIZE in the general case.
 * Ditto for the __ia64__ case accordingly.
 */
#define YY_BUF_SIZE 32768
#else
#define YY_BUF_SIZE 16384
#endif /* __ia64__ */
#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

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

extern yy_size_t 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)
    #define YY_LINENO_REWIND_TO(ptr)
    
/* 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_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.
	 */
	yy_size_t 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 yy_size_t yy_n_chars;		/* number of characters read into yy_ch_buf */
yy_size_t 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,yy_size_t 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() 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) 2000-2012, PostgreSQL Global Development Group
 *
 * src/backend/utils/misc/guc-file.l
 */
#line 11 "guc-file.l"

#include "postgres.h"

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

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


/*
 * flex emits a yy_fatal_error() function that it calls in response to
 * critical errors like malloc failure, file I/O errors, and detection of
 * internal inconsistency.  That function prints a message and calls exit().
 * Mutate it to instead call our handler, which jumps out of the parser.
 */
#undef fprintf
#define fprintf(file, fmt, msg) GUC_flex_fatal(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
};

static unsigned int ConfigFileLineno;
static const char *GUC_flex_fatal_errmsg;
static sigjmp_buf *GUC_flex_fatal_jmp;

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

static int GUC_flex_fatal(const char *msg);
static char *GUC_scanstr(const char *s);

#define YY_NO_INPUT 1
#line 581 "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  );

yy_size_t 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
#ifdef __ia64__
/* On IA-64, the buffer size is 16k, not 8k */
#define YY_READ_BUF_SIZE 16384
#else
#define YY_READ_BUF_SIZE 8192
#endif /* __ia64__ */
#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 do { if (fwrite( GUC_yytext, GUC_yyleng, 1, GUC_yyout )) {} } while (0)
#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, (yy_size_t) 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;
    
	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( );
		}

	{
#line 86 "guc-file.l"


#line 796 "guc-file.c"

	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 88 "guc-file.l"
ConfigFileLineno++; return GUC_EOL;
	YY_BREAK
case 2:
YY_RULE_SETUP
#line 89 "guc-file.l"
/* eat whitespace */
	YY_BREAK
case 3:
YY_RULE_SETUP
#line 90 "guc-file.l"
/* eat comment (.* matches anything until newline) */
	YY_BREAK
case 4:
YY_RULE_SETUP
#line 92 "guc-file.l"
return GUC_ID;
	YY_BREAK
case 5:
YY_RULE_SETUP
#line 93 "guc-file.l"
return GUC_QUALIFIED_ID;
	YY_BREAK
case 6:
YY_RULE_SETUP
#line 94 "guc-file.l"
return GUC_STRING;
	YY_BREAK
case 7:
YY_RULE_SETUP
#line 95 "guc-file.l"
return GUC_UNQUOTED_STRING;
	YY_BREAK
case 8:
YY_RULE_SETUP
#line 96 "guc-file.l"
return GUC_INTEGER;
	YY_BREAK
case 9:
YY_RULE_SETUP
#line 97 "guc-file.l"
return GUC_REAL;
	YY_BREAK
case 10:
YY_RULE_SETUP
#line 98 "guc-file.l"
return GUC_EQUALS;
	YY_BREAK
case 11:
YY_RULE_SETUP
#line 100 "guc-file.l"
return GUC_ERROR;
	YY_BREAK
case 12:
YY_RULE_SETUP
#line 102 "guc-file.l"
YY_FATAL_ERROR( "flex scanner jammed" );
	YY_BREAK
#line 910 "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 user's declarations */
} /* 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_LVALUE;

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

			if ( b->yy_is_our_buffer )
				{
				yy_size_t 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), 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 */
			yy_size_t 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)
{
	yy_size_t 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 yybytes the byte buffer to scan
 * @param _yybytes_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, yy_size_t  _yybytes_len )
{
	YY_BUFFER_STATE b;
	char *buf;
	yy_size_t n;
	yy_size_t 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.
 * 
 */
yy_size_t 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 101 "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)
{
	bool		error = false;
	bool		apply = false;
	int			elevel;
	ConfigVariable *item,
				   *head,
				   *tail;
	int			i;

	/*
	 * Config files are processed on startup (by the postmaster only)
	 * and on SIGHUP (by the postmaster and its children)
	 */
	Assert((context == PGC_POSTMASTER && !IsUnderPostmaster) ||
		   context == PGC_SIGHUP);

	/*
	 * To avoid cluttering the log, only the postmaster bleats loudly
	 * about problems with the config file.
	 */
	elevel = IsUnderPostmaster ? DEBUG2 : LOG;

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

	if (!ParseConfigFile(ConfigFileName, NULL, true, 0, elevel, &head, &tail))
	{
		/* Syntax error(s) detected in the file, so bail out */
		error = true;
		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 the supplied option names are valid, as an additional
	 * quasi-syntactic check on the validity of the config file.  It is
	 * important that the postmaster and all backends agree on the results
	 * of this phase, else we will have strange inconsistencies about which
	 * processes accept a config file update and which don't.  Hence, unknown
	 * custom variable names have to be accepted without complaint.  For the
	 * same reason, we don't attempt to validate the options' values here.
	 *
	 * In addition, the GUC_IS_IN_FILE flag is set on each existing GUC
	 * variable mentioned in the file.
	 */
	for (item = head; item; item = item->next)
	{
		struct config_generic *record;

		/*
		 * Try to find the variable; but do not create a custom placeholder
		 * if it's not there already.
		 */
		record = find_option(item->name, false, elevel);

		if (record)
		{
			/* Found, so mark it as present in file */
			record->status |= GUC_IS_IN_FILE;
		}
		else if (strchr(item->name, GUC_QUALIFIER_SEPARATOR) == NULL)
		{
			/* Invalid non-custom variable, so complain */
			ereport(elevel,
					(errcode(ERRCODE_UNDEFINED_OBJECT),
					 errmsg("unrecognized configuration parameter \"%s\" in file \"%s\" line %u",
							item->name,
							item->filename, item->sourceline)));
			error = true;
		}
	}

	/*
	 * If we've detected any errors so far, we don't want to risk applying
	 * any changes.
	 */
	if (error)
		goto cleanup_list;

	/* Otherwise, set flag that we're beginning to apply changes */
	apply = true;

	/*
	 * 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,
	 * report that and continue.
	 */
	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("parameter \"%s\" cannot be changed without restarting the server",
							gconf->name)));
			error = true;
			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 (i.e., the boot_val) */
		if (set_config_option(gconf->name, NULL,
							  context, PGC_S_DEFAULT,
							  GUC_ACTION_SET, true, 0) > 0)
		{
			/* Log the change if appropriate */
			if (context == PGC_SIGHUP)
				ereport(elevel,
						(errmsg("parameter \"%s\" removed from configuration file, reset to default",
								gconf->name)));
		}
	}

	/*
	 * Restore any variables determined by environment variables or
	 * dynamically-computed defaults.  This is a no-op except in the case
	 * where one of these had been in the config file and is now removed.
	 *
	 * In particular, we *must not* do this during the postmaster's
	 * initial loading of the file, since the timezone functions in
	 * particular should be run only after initialization is complete.
	 *
	 * XXX this is an unmaintainable crock, because we have to know how
	 * to set (or at least what to call to set) every variable that could
	 * potentially have PGC_S_DYNAMIC_DEFAULT or PGC_S_ENV_VAR source.
	 * However, there's no time to redesign it for 9.1.
	 */
	if (context == PGC_SIGHUP)
	{
		InitializeGUCOptionsFromEnvironment();
		pg_timezone_abbrev_initialize();
		/* this selects SQL_ASCII in processes not connected to a database */
		SetConfigOption("client_encoding", GetDatabaseEncodingName(),
						PGC_BACKEND, PGC_S_DYNAMIC_DEFAULT);
	}

	/*
	 * Now apply the values from the config file.
	 */
	for (item = head; item; item = item->next)
	{
		char   *pre_value = NULL;
		int		scres;

		/* In SIGHUP cases in the postmaster, we want to report changes */
		if (context == PGC_SIGHUP && !IsUnderPostmaster)
		{
			const char *preval = GetConfigOption(item->name, true, false);

			/* If option doesn't exist yet or is NULL, treat as empty string */
			if (!preval)
				preval = "";
			/* must dup, else might have dangling pointer below */
			pre_value = pstrdup(preval);
		}

		scres = set_config_option(item->name, item->value,
								  context, PGC_S_FILE,
								  GUC_ACTION_SET, true, 0);
		if (scres > 0)
		{
			/* variable was updated, so log the change if appropriate */
			if (pre_value)
			{
				const char *post_value = GetConfigOption(item->name, true, false);

				if (!post_value)
					post_value = "";
				if (strcmp(pre_value, post_value) != 0)
					ereport(elevel,
							(errmsg("parameter \"%s\" changed to \"%s\"",
									item->name, item->value)));
			}
		}
		else if (scres == 0)
			error = true;
		/* else no error but variable's active value was not changed */

		/*
		 * We should update source location unless there was an error, since
		 * even if the active value didn't change, the reset value might have.
		 * (In the postmaster, there won't be a difference, but it does matter
		 * in backends.)
		 */
		if (scres != 0)
			set_config_sourcefile(item->name, item->filename,
								  item->sourceline);

		if (pre_value)
			pfree(pre_value);
	}

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

 cleanup_list:
	FreeConfigVariables(head);

	if (error)
	{
		/* During postmaster startup, any error is fatal */
		if (context == PGC_POSTMASTER)
			ereport(ERROR,
					(errcode(ERRCODE_CONFIG_FILE_ERROR),
					 errmsg("configuration file \"%s\" contains errors",
							ConfigFileName)));
		else if (apply)
			ereport(elevel,
					(errcode(ERRCODE_CONFIG_FILE_ERROR),
					 errmsg("configuration file \"%s\" contains errors; unaffected changes were applied",
							ConfigFileName)));
		else
			ereport(elevel,
					(errcode(ERRCODE_CONFIG_FILE_ERROR),
					 errmsg("configuration file \"%s\" contains errors; no changes were applied",
							ConfigFileName)));
	}
}

/*
 * Read and parse a single configuration file.  This function recurses
 * to handle "include" directives.
 *
 * See ParseConfigFp for details.  This one merely adds opening the
 * file rather than working from a caller-supplied file descriptor,
 * and absolute-ifying the path name if necessary.
 */
bool
ParseConfigFile(const char *config_file, const char *calling_file, bool strict,
				int depth, int elevel,
				ConfigVariable **head_p,
				ConfigVariable **tail_p)
{
	bool		OK = true;
	FILE	   *fp;
	char		abs_path[MAXPGPATH];

	/*
	 * 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))
	{
		if (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;
		}
		else
		{
			/*
			 * calling_file is NULL, we make an absolute path from $PGDATA
			 */
			join_path_components(abs_path, data_directory, config_file);
			canonicalize_path(abs_path);
			config_file = abs_path;
		}
	}

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

		ereport(LOG,
				(errmsg("skipping missing configuration file \"%s\"",
						config_file)));
		return OK;
	}

	OK = ParseConfigFp(fp, config_file, depth, elevel, head_p, tail_p);

	FreeFile(fp);

	return OK;
}

/*
 * Flex fatal errors bring us here.  Stash the error message and jump back to
 * ParseConfigFp().  Assume all msg arguments point to string constants; this
 * holds for flex 2.5.31 (earliest we support) and flex 2.5.35 (latest as of
 * this writing).  Otherwise, we would need to copy the message.
 *
 * We return "int" since this takes the place of calls to fprintf().
*/
static int
GUC_flex_fatal(const char *msg)
{
	GUC_flex_fatal_errmsg = msg;
	siglongjmp(*GUC_flex_fatal_jmp, 1);
	return 0;	/* keep compiler quiet */
}

/*
 * Read and parse a single configuration file.  This function recurses
 * to handle "include" directives.
 *
 * Input parameters:
 *	fp: file pointer from AllocateFile for the configuration file to parse
 *	config_file: absolute or relative path name of the configuration file
 *	depth: recursion depth (should be 0 in the outermost call)
 *	elevel: error logging level to use
 * 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 ConfigVariable list.
 *
 * Note: if elevel >= ERROR then an error will not return control to the
 * caller, so there is no need to check the return value in that case.
 */
bool
ParseConfigFp(FILE *fp, const char *config_file, int depth, int elevel,
			  ConfigVariable **head_p, ConfigVariable **tail_p)
{
	volatile bool OK = true;
	unsigned int save_ConfigFileLineno = ConfigFileLineno;
	sigjmp_buf *save_GUC_flex_fatal_jmp = GUC_flex_fatal_jmp;
	sigjmp_buf	flex_fatal_jmp;
	volatile YY_BUFFER_STATE lex_buffer = NULL;
	int			errorcount;
	int			token;

	if (sigsetjmp(flex_fatal_jmp, 1) == 0)
		GUC_flex_fatal_jmp = &flex_fatal_jmp;
	else
	{
		/*
		 * Regain control after a fatal, internal flex error.  It may have
		 * corrupted parser state.  Consequently, abandon the file, but trust
		 * that the state remains sane enough for GUC_yy_delete_buffer().
		 */
		elog(elevel, "%s at file \"%s\" line %u",
			 GUC_flex_fatal_errmsg, config_file, ConfigFileLineno);

		OK = false;
		goto cleanup;
	}

	/*
	 * Parse
	 */
	ConfigFileLineno = 1;
	errorcount = 0;

	lex_buffer = GUC_yy_create_buffer(fp,YY_BUF_SIZE);
	GUC_yy_switch_to_buffer(lex_buffer);

	/* This loop iterates once per logical line */
	while ((token = GUC_yylex()))
	{
		char	   *opt_name = NULL;
		char	   *opt_value = NULL;
		ConfigVariable *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_if_exists") == 0)
		{
			/*
			 * An include_if_exists directive isn't a variable and should be
			 * processed immediately.
			 */
			if (!ParseConfigFile(opt_value, config_file, false,
								 depth + 1, elevel,
								 head_p, tail_p))
				OK = false;
			GUC_yy_switch_to_buffer(lex_buffer);
			pfree(opt_name);
			pfree(opt_value);
		}
		else if (guc_name_compare(opt_name, "include") == 0)
		{
			/*
			 * An include directive isn't a variable and should be processed
			 * immediately.
			 */
			if (!ParseConfigFile(opt_value, config_file, true,
								 depth + 1, elevel,
								 head_p, tail_p))
				OK = false;
			GUC_yy_switch_to_buffer(lex_buffer);
			pfree(opt_name);
			pfree(opt_value);
		}
		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;
		continue;

	parse_error:
		/* release storage if we allocated any on this line */
		if (opt_name)
			pfree(opt_name);
		if (opt_value)
			pfree(opt_value);

		/* report the 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;
		errorcount++;

		/*
		 * To avoid producing too much noise when fed a totally bogus file,
		 * give up after 100 syntax errors per file (an arbitrary number).
		 * Also, if we're only logging the errors at DEBUG level anyway,
		 * might as well give up immediately.  (This prevents postmaster
		 * children from bloating the logs with duplicate complaints.)
		 */
		if (errorcount >= 100 || elevel <= DEBUG1)
		{
			ereport(elevel,
					(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
					 errmsg("too many syntax errors found, abandoning file \"%s\"",
							config_file)));
			break;
		}

		/* resync to next end-of-line or EOF */
		while (token != GUC_EOL && token != 0)
			token = GUC_yylex();
		/* break out of loop on EOF */
		if (token == 0)
			break;
	}

cleanup:
	GUC_yy_delete_buffer(lex_buffer);
	/* Each recursion level must save and restore these static variables. */
	ConfigFileLineno = save_ConfigFileLineno;
	GUC_flex_fatal_jmp = save_GUC_flex_fatal_jmp;
	return OK;
}


/*
 * Free a list of ConfigVariables, including the names and the values
 */
void
FreeConfigVariables(ConfigVariable *list)
{
	ConfigVariable *item;

	item = list;
	while (item)
	{
		ConfigVariable *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;
}

