scan.c

操作系统源代码

/* A lexical scanner generated by flex */

/* scanner skeleton version:
 * $Header: /usr/fsys/odin/a/vern/flex/RCS/flex.skel,v 2.16 90/08/03 14:09:36 vern Exp $
 */

#define FLEX_SCANNER

#include <stdio.h>


/* cfront 1.2 defines "c_plusplus" instead of "__cplusplus" */
#ifdef c_plusplus
#ifndef __cplusplus
#define __cplusplus
#endif
#endif


#ifdef __cplusplus

#include <stdlib.h>
#include <osfcn.h>

/* use prototypes in function declarations */
#define YY_USE_PROTOS

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

#else	/* ! __cplusplus */

#ifdef __STDC__

#ifdef __GNUC__
#include <stddef.h>
void *malloc( size_t );
void free( void* );
#else
#include <stdlib.h>
#endif	/* __GNUC__ */

#define YY_USE_PROTOS
#define YY_USE_CONST

#endif	/* __STDC__ */
#endif	/* ! __cplusplus */


#ifdef __TURBOC__
#define YY_USE_CONST
#endif


#ifndef YY_USE_CONST
#define const
#endif


#ifdef YY_USE_PROTOS
#define YY_PROTO(proto) proto
#else
#define YY_PROTO(proto) ()
/* we can't get here if it's an ANSI C compiler, or a C++ compiler,
 * so it's got to be a K&R compiler, and therefore there's no standard
 * place from which to include these definitions
 */
/* char *malloc();
int free(); */
int read();
#endif


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

/* returned upon end-of-file */
#define YY_END_TOK 0

/* copy whatever the last rule matched to the standard output */

/* cast to (char *) is because for 8-bit chars, yytext is (unsigned char *) */
/* this used to be an fputs(), but since the string might contain NUL's,
 * we now use fwrite()
 */
#define ECHO (void) fwrite( (char *) yytext, yyleng, 1, yyout )

/* gets input and stuffs it into "buf".  number of characters read, or YY_NULL,
 * is returned in "result".
 */
#define YY_INPUT(buf,result,max_size) \
	if ( (result = read( fileno(yyin), (char *) buf, max_size )) < 0 ) \
	    YY_FATAL_ERROR( "read() in flex scanner failed" );
#define YY_NULL 0

/* 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.
 */
#define yyterminate() return ( YY_NULL )

/* report a fatal error */

/* The funky do-while is used to turn this macro definition into
 * a single C statement (which needs a semi-colon terminator).
 * This avoids problems with code like:
 *
 * 	if ( something_happens )
 *		YY_FATAL_ERROR( "oops, the something happened" );
 *	else
 *		everything_okay();
 *
 * Prior to using the do-while the compiler would get upset at the
 * "else" because it interpreted the "if" statement as being all
 * done when it reached the ';' after the YY_FATAL_ERROR() call.
 */

#define YY_FATAL_ERROR(msg) \
	do \
		{ \
		(void) fputs( msg, stderr ); \
		(void) putc( '\n', stderr ); \
		exit( 1 ); \
		} \
	while ( 0 )

/* default yywrap function - always treat EOF as an EOF */
#define yywrap() 1

/* 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 *

/* 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 \
	do \
		{ \
		yy_init_buffer( yy_current_buffer, yyin ); \
		yy_load_buffer_state(); \
		} \
	while ( 0 )

/* default declaration of generated scanner - a define so the user can
 * easily add parameters
 */
#define YY_DECL int yylex YY_PROTO(( void )) 

/* code executed at the end of each rule */
#define YY_BREAK break;

#define YY_END_OF_BUFFER_CHAR 0

#ifndef YY_BUF_SIZE
#define YY_BUF_SIZE (YY_READ_BUF_SIZE * 2) /* size of default input buffer */
#endif

typedef struct yy_buffer_state *YY_BUFFER_STATE;

#define YY_CHAR unsigned char
# line 1 "scan.l"
#define INITIAL 0
# line 2 "scan.l"
/* scan.l: the (f)lex description file for the scanner. */

/*  This file is part of bc written for MINIX.
    Copyright (C) 1991, 1992 Free Software Foundation, Inc.

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License , or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; see the file COPYING.  If not, write to
    the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.

    You may contact the author by:
       e-mail:  [e-mail]
      us-mail:  Philip A. Nelson
                Computer Science Department, 9062
                Western Washington University
                Bellingham, WA 98226-9062
       
*************************************************************************/

#include "bcdefs.h"
#include "y.tab.h"
#include "global.h"
#include "proto.h"

/* Using flex, we can ask for a smaller input buffer.  With lex, this
   does nothing! */

#ifdef SMALL_BUF
#undef YY_READ_BUF_SIZE
#define YY_READ_BUF_SIZE 512
#endif

/* We want to define our own yywrap. */
#undef yywrap
_PROTOTYPE(int yywrap, (void));

/* MINIX returns from read with < 0 if SIGINT is  encountered.
   In flex, we can redefine YY_INPUT to the following.  In lex, this
   does nothing! */
#include <errno.h>
#undef  YY_INPUT
#define YY_INPUT(buf,result,max_size) \
	while ( (result = read( fileno(yyin), (char *) buf, max_size )) < 0 ) \
	    if (errno != EINTR) \
		YY_FATAL_ERROR( "read() in flex scanner failed" );

# line 60 "scan.l"

/* done after the current pattern has been matched and before the
 * corresponding action - sets up yytext
 */
#define YY_DO_BEFORE_ACTION \
	yytext = yy_bp; \
	yyleng = yy_cp - yy_bp; \
	yy_hold_char = *yy_cp; \
	*yy_cp = '\0'; \
	yy_c_buf_p = yy_cp;

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

/* return all but the first 'n' matched characters back to the input stream */
#define yyless(n) \
	do \
		{ \
		/* undo effects of setting up yytext */ \
		*yy_cp = yy_hold_char; \
		yy_c_buf_p = yy_cp = yy_bp + n; \
		YY_DO_BEFORE_ACTION; /* set up yytext again */ \
		} \
	while ( 0 )

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


struct yy_buffer_state
    {
    FILE *yy_input_file;

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

    /* size of input buffer in bytes, not including room for EOB characters*/
    int yy_buf_size;	

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

    int yy_eof_status;		/* whether we've seen an EOF on this buffer */
#define EOF_NOT_SEEN 0
    /* "pending" happens when the EOF has been seen but there's still
     * some text process
     */
#define EOF_PENDING 1
#define EOF_DONE 2
    };

static YY_BUFFER_STATE yy_current_buffer;

/* 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"
 */
#define YY_CURRENT_BUFFER yy_current_buffer


/* yy_hold_char holds the character lost when yytext is formed */
static YY_CHAR yy_hold_char;

static int yy_n_chars;		/* number of characters read into yy_ch_buf */



#ifndef YY_USER_ACTION
#define YY_USER_ACTION
#endif

#ifndef YY_USER_INIT
#define YY_USER_INIT
#endif

extern YY_CHAR *yytext;
extern int yyleng;
extern FILE *yyin, *yyout;

YY_CHAR *yytext;
int yyleng;

FILE *yyin = (FILE *) 0, *yyout = (FILE *) 0;

#define YY_END_OF_BUFFER 40
typedef int yy_state_type;
static const short int yy_accept[144] =
    {   0,
        0,    0,   40,   38,   33,   31,   25,   38,   26,   38,
       22,   26,   22,   22,   38,   26,   37,   29,   27,   29,
       38,   22,   35,   35,   35,   35,   35,   35,   35,   35,
       35,   35,   35,   35,   35,   35,   35,   35,   38,   33,
       29,    0,   36,   27,   23,   30,   37,    0,   34,   37,
       37,    0,   28,   32,   35,   35,   35,   35,   35,   35,
       35,   35,   35,    7,   35,   35,   35,   35,   35,   35,
       35,   35,   35,   35,   35,   24,   37,    0,    0,   37,
        0,   35,   35,   35,   35,   35,    6,   35,   35,   35,
       35,   35,   35,   35,   35,   35,   35,   35,   35,   35,

       35,   13,   35,   35,   35,   14,   16,   35,   17,   35,
       35,   35,   35,    3,   15,   35,   35,    9,   35,   35,
        2,   35,   35,   11,   35,   35,   12,   20,   35,   10,
       35,    8,   35,    1,    4,   21,    5,   35,   35,   35,
       19,   18,    0
    } ;

static const YY_CHAR yy_ec[256] =
    {   0,
        1,    1,    1,    1,    1,    1,    1,    1,    2,    3,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    2,    4,    5,    1,    1,    6,    7,    1,    8,
        9,   10,   11,   12,   13,   14,   15,   16,   16,   16,
       16,   16,   16,   16,   16,   16,   16,    1,   17,   18,
       19,   20,    1,    1,   21,   21,   21,   21,   21,   21,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
       22,   23,   24,   25,   26,    1,   27,   28,   29,   30,

       31,   32,   33,   34,   35,   36,   37,   38,   39,   40,
       41,   42,   43,   44,   45,   46,   47,   36,   48,   36,
       49,   36,   50,   51,   52,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,

        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1
    } ;

static const YY_CHAR yy_meta[53] =
    {   0,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    2,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    2,    2,    2,    2,    2,
        2,    2,    2,    2,    2,    2,    2,    2,    2,    2,
        2,    2,    2,    2,    2,    2,    2,    2,    2,    1,
        1,    1
    } ;

static const short int yy_base[146] =
    {   0,
        0,    0,  193,  194,  190,  194,  172,  185,  170,  181,
      194,  168,   42,   41,   41,   46,   52,  167,   61,  166,
      181,  164,  135,  137,  139,  148,  140,  136,    0,  149,
       27,   50,  147,  130,  126,  141,   40,   36,  120,  168,
      194,  164,  194,  194,  194,  194,   66,  165,  194,   72,
       76,  164,  194,  194,    0,  120,  134,  124,  131,  117,
      117,  122,  132,    0,  113,  117,  117,  128,  119,  118,
       52,  125,  107,  106,  114,  194,   80,  145,   84,   88,
      144,  105,  118,   98,  108,  111,    0,   95,   95,   93,
      105,  102,   91,   95,   88,  103,   85,   93,   84,   85,

       90,    0,   90,   91,   85,    0,    0,   93,    0,   77,
       76,   90,   74,    0,    0,   75,   87,    0,   90,   85,
        0,   75,   83,    0,   76,   63,    0,    0,   66,    0,
       62,    0,   47,    0,    0,    0,    0,   45,   53,   29,
        0,    0,  194,  111,   56
    } ;

static const short int yy_def[146] =
    {   0,
      143,    1,  143,  143,  143,  143,  143,  144,  143,  143,
      143,  143,  143,  143,  143,  143,  143,  143,  143,  143,
      143,  143,  145,  145,  145,  145,  145,  145,  145,  145,
      145,  145,  145,  145,  145,  145,  145,  145,  143,  143,
      143,  144,  143,  143,  143,  143,  143,  143,  143,  143,
      143,  143,  143,  143,  145,  145,  145,  145,  145,  145,
      145,  145,  145,  145,  145,  145,  145,  145,  145,  145,
      145,  145,  145,  145,  145,  143,  143,  143,  143,  143,
      143,  145,  145,  145,  145,  145,  145,  145,  145,  145,
      145,  145,  145,  145,  145,  145,  145,  145,  145,  145,

      145,  145,  145,  145,  145,  145,  145,  145,  145,  145,
      145,  145,  145,  145,  145,  145,  145,  145,  145,  145,
      145,  145,  145,  145,  145,  145,  145,  145,  145,  145,
      145,  145,  145,  145,  145,  145,  145,  145,  145,  145,
      145,  145,    0,  143,  143
    } ;

static const short int yy_nxt[247] =
    {   0,
        4,    5,    6,    7,    8,    9,   10,   11,   11,   12,
       13,   11,   14,   15,   16,   17,   11,   18,   19,   20,
       17,   11,   21,   11,   22,    4,   23,   24,   25,   26,
       27,   28,   29,   30,   31,   29,   29,   32,   29,   29,
       33,   34,   35,   36,   37,   29,   29,   38,   29,   11,
       39,   11,   46,   46,   63,   49,   47,   55,   64,   44,
       44,   47,   74,   48,   44,   50,   53,   51,   72,   75,
       53,   53,   51,   53,   52,   53,   65,  142,   96,   41,
       66,   77,   73,  141,   67,   53,   77,   80,   78,   50,
      140,   51,   80,  139,   81,   77,   51,   97,   52,   47,

       77,  138,   78,   80,   47,  137,   48,  136,   80,  135,
       81,   42,   42,  134,  133,  132,  131,  130,  129,  128,
      127,  126,  125,  124,  123,  122,  121,  120,  119,  118,
      117,  116,  115,  114,  113,  112,  111,  110,  109,  108,
      107,  106,  105,  104,  103,  102,   80,   77,  101,  100,
       99,   98,   95,   94,   93,   92,   91,   90,   89,   88,
       87,   86,   85,   84,   83,   82,   51,   79,   43,   40,
       76,   71,   70,   69,   68,   62,   61,   60,   59,   58,
       57,   56,   44,   54,   41,   41,   44,   45,   44,   43,
       41,   40,  143,    3,  143,  143,  143,  143,  143,  143,

      143,  143,  143,  143,  143,  143,  143,  143,  143,  143,
      143,  143,  143,  143,  143,  143,  143,  143,  143,  143,
      143,  143,  143,  143,  143,  143,  143,  143,  143,  143,
      143,  143,  143,  143,  143,  143,  143,  143,  143,  143,
      143,  143,  143,  143,  143,  143
    } ;

static const short int yy_chk[247] =
    {   0,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,    1,    1,    1,    1,    1,    1,    1,    1,
        1,    1,   13,   14,   31,   16,   15,  145,   31,   14,
       13,   15,   38,   15,   16,   17,   19,   17,   37,   38,
       19,   19,   17,   19,   17,   19,   32,  140,   71,   19,
       32,   47,   37,  139,   32,   19,   47,   50,   47,   51,
      138,   51,   50,  133,   50,   77,   51,   71,   51,   79,