C指针原理(10)-编译原理-小型计算器实现

flex和bison编译系列

本博客所有内容是原创，如果转载请注明来源

http://blog.csdn.net/myhaspl/

 Cygwin是一组工具，在WINDOWS操作系统下提供LINUX外观，让用户感觉在LINUX环境操作一样。Cygwin关键是cygwin1.dll库，它能模拟LINUX的API层，提供大量的linux API函数。

    但cygwin不能在WINDOWS下运行原生的LINUX程序，如果想在WINDOWS下运行，必须重新编译源代码。而原生 的windows程序也无法意识到自己是工作在一些UNIX机制下，比如说信号、伪终端等，你可以重新从源代码编译你的程序，以便利用Cygwin的提供的UNIX机制。 

安装好cygwin，同时下载flex和bison，如果安装时没有下载，可以再运行一次安装文件，选择install from local directory

安装完毕后进行测试

                 

1、打开cygwin,进入home目录,home目录在WINDOWS系统的cygwin安装目录映射为home目录。

2、首先，在home目录中新建文件夹，在文件夹中放置如下内容的test1.l

/*统计字数*/

%{

int chars=0;

int words=0;

int lines=0;

%}

%%

[a-zA-Z]+  {words++;chars+=strlen(yytext);}

\n  {chars++;lines++;}

.   {chars++;}

%%

main(int argc,char**argv)

{

   yylex();

   printf("%d%d%d\n",lines,words,chars);

}

然后调用flex生成词法分析器

 

Administrator@2012-20121224HD /home/flexlinux

$ cd /home

 

Administrator@2012-20121224HD /home

$ cd flexlinux

 

Administrator@2012-20121224HD /home/flexlinux

$ flex test1.l

 

Administrator@2012-20121224HD /home/flexlinux

$

可以看到目录中的lex.yy.c就是刚生成的C源码，可分析词法。

Administrator@2012-20121224HD /home/flexlinux

$ ls

lex.yy.c  test1.l

 

Administrator@2012-20121224HD /home/flexlinux

$

 flex自动生成了下面程序

#line 3 "lex.yy.c"#define  YY_INT_ALIGNED short int/* A lexical scanner generated by flex */#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;#elsetypedef 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 yyrestart(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_STATEtypedef struct yy_buffer_state *YY_BUFFER_STATE;#endifextern int yyleng;extern FILE *yyin, *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 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 yytext again */ \} \while ( 0 )#define unput(c) yyunput( c, (yytext_ptr)  )#ifndef YY_TYPEDEF_YY_SIZE_T#define YY_TYPEDEF_YY_SIZE_Ttypedef size_t yy_size_t;#endif#ifndef YY_STRUCT_YY_BUFFER_STATE#define YY_STRUCT_YY_BUFFER_STATEstruct 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 yyrestart()), so that the user can continue scanning by * just pointing 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 yytext is formed. */static char yy_hold_char;static int yy_n_chars;/* number of characters read into yy_ch_buf */int 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 yywrap()'s to do buffer switches * instead of setting up a fresh yyin.  A bit of a hack ... */static int yy_did_buffer_switch_on_eof;void yyrestart (FILE *input_file  );void yy_switch_to_buffer (YY_BUFFER_STATE new_buffer  );YY_BUFFER_STATE yy_create_buffer (FILE *file,int size  );void yy_delete_buffer (YY_BUFFER_STATE b  );void yy_flush_buffer (YY_BUFFER_STATE b  );void yypush_buffer_state (YY_BUFFER_STATE new_buffer  );void yypop_buffer_state (void );static void yyensure_buffer_stack (void );static void yy_load_buffer_state (void );static void yy_init_buffer (YY_BUFFER_STATE b,FILE *file  );#define YY_FLUSH_BUFFER yy_flush_buffer(YY_CURRENT_BUFFER )YY_BUFFER_STATE yy_scan_buffer (char *base,yy_size_t size  );YY_BUFFER_STATE yy_scan_string (yyconst char *yy_str  );YY_BUFFER_STATE yy_scan_bytes (yyconst char *bytes,int len  );void *yyalloc (yy_size_t  );void *yyrealloc (void *,yy_size_t  );void yyfree (void *  );#define yy_new_buffer yy_create_buffer#define yy_set_interactive(is_interactive) \{ \if ( ! YY_CURRENT_BUFFER ){ \        yyensure_buffer_stack (); \YY_CURRENT_BUFFER_LVALUE =    \            yy_create_buffer(yyin,YY_BUF_SIZE ); \} \YY_CURRENT_BUFFER_LVALUE->yy_is_interactive = is_interactive; \}#define yy_set_bol(at_bol) \{ \if ( ! YY_CURRENT_BUFFER ){\        yyensure_buffer_stack (); \YY_CURRENT_BUFFER_LVALUE =    \            yy_create_buffer(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 */typedef unsigned char YY_CHAR;FILE *yyin = (FILE *) 0, *yyout = (FILE *) 0;typedef int yy_state_type;extern int yylineno;int yylineno = 1;extern char *yytext;#define yytext_ptr yytextstatic 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 yytext. */#define YY_DO_BEFORE_ACTION \(yytext_ptr) = yy_bp; \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 4#define YY_END_OF_BUFFER 5/* 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[9] =    {   0,        0,    0,    5,    3,    2,    1,    1,    0    } ;static yyconst flex_int32_t yy_ec[256] =    {   0,        1,    1,    1,    1,    1,    1,    1,    1,    1,    2,        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,    3,    3,    3,    3,    3,    3,        3,    3,    3,    3,    3,    3,    3,    3,    3,    3,        3,    3,    3,    3,    3,    3,    3,    3,    3,    3,        1,    1,    1,    1,    1,    1,    3,    3,    3,    3,        3,    3,    3,    3,    3,    3,    3,    3,    3,    3,        3,    3,    3,    3,    3,    3,    3,    3,    3,    3,        3,    3,    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,    1,    1,    1    } ;static yyconst flex_int32_t yy_meta[4] =    {   0,        1,    1,    2    } ;static yyconst flex_int16_t yy_base[10] =    {   0,        0,    0,    5,    6,    6,    0,    0,    6,    2    } ;static yyconst flex_int16_t yy_def[10] =    {   0,        8,    1,    8,    8,    8,    9,    9,    0,    8    } ;static yyconst flex_int16_t yy_nxt[10] =    {   0,        4,    5,    6,    7,    8,    3,    8,    8,    8    } ;static yyconst flex_int16_t yy_chk[10] =    {   0,        1,    1,    1,    9,    3,    8,    8,    8,    8    } ;static yy_state_type yy_last_accepting_state;static char *yy_last_accepting_cpos;extern int yy_flex_debug;int 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_OFFSETchar *yytext;#line 1 "test1.l"/*统计字数*/#line 3 "test1.l"int chars=0;int words=0;int lines=0;#line 454 "lex.yy.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 *#endifstatic int yy_init_globals (void );/* Accessor methods to globals.   These are made visible to non-reentrant scanners for convenience. */int yylex_destroy (void );int yyget_debug (void );void yyset_debug (int debug_flag  );YY_EXTRA_TYPE yyget_extra (void );void yyset_extra (YY_EXTRA_TYPE user_defined  );FILE *yyget_in (void );void yyset_in  (FILE * in_str  );FILE *yyget_out (void );void yyset_out  (FILE * out_str  );int yyget_leng (void );char *yyget_text (void );int yyget_lineno (void );void yyset_lineno (int line_number  );/* Macros after this point can all be overridden by user definitions in * section 1. */#ifndef YY_SKIP_YYWRAP#ifdef __cplusplusextern "C" int yywrap (void );#elseextern int yywrap (void );#endif#endif    static void yyunput (int c,char *buf_ptr  );    #ifndef yytext_ptrstatic void yy_flex_strncpy (char *,yyconst char *,int );#endif#ifdef YY_NEED_STRLENstatic int yy_flex_strlen (yyconst char * );#endif#ifndef YY_NO_INPUT#ifdef __cplusplusstatic int yyinput (void );#elsestatic 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( yytext, yyleng, 1, 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( yyin )) != EOF && c != '\n'; ++n ) \buf[n] = (char) c; \if ( c == '\n' ) \buf[n++] = (char) c; \if ( c == EOF && ferror( yyin ) ) \YY_FATAL_ERROR( "input in flex scanner failed" ); \result = n; \} \else \{ \errno=0; \while ( (result = fread(buf, 1, max_size, yyin))==0 && ferror(yyin)) \{ \if( errno != EINTR) \{ \YY_FATAL_ERROR( "input in flex scanner failed" ); \break; \} \errno=0; \clearerr(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 1extern int yylex (void);#define YY_DECL int yylex (void)#endif /* !YY_DECL *//* Code executed at the beginning of each rule, after yytext and 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 7 "test1.l"#line 638 "lex.yy.c"if ( !(yy_init) ){(yy_init) = 1;#ifdef YY_USER_INITYY_USER_INIT;#endifif ( ! (yy_start) )(yy_start) = 1;/* first start state */if ( ! yyin )yyin = stdin;if ( ! yyout )yyout = stdout;if ( ! YY_CURRENT_BUFFER ) {yyensure_buffer_stack ();YY_CURRENT_BUFFER_LVALUE =yy_create_buffer(yyin,YY_BUF_SIZE );}yy_load_buffer_state( );}while ( 1 )/* loops until end-of-file is reached */{yy_cp = (yy_c_buf_p);/* Support of 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 >= 9 )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_base[yy_current_state] != 6 );yy_find_action:yy_act = yy_accept[yy_current_state];if ( yy_act == 0 ){ /* have to back up */yy_cp = (yy_last_accepting_cpos);yy_current_state = (yy_last_accepting_state);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:YY_RULE_SETUP#line 8 "test1.l"{words++;chars+=strlen(yytext);}YY_BREAKcase 2:/* rule 2 can match eol */YY_RULE_SETUP#line 9 "test1.l"{chars++;lines++;}YY_BREAKcase 3:YY_RULE_SETUP#line 10 "test1.l"{chars++;}YY_BREAKcase 4:YY_RULE_SETUP#line 11 "test1.l"ECHO;YY_BREAK#line 742 "lex.yy.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_OFFSETif ( 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 yyin at a new source and called * 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 = 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_c_buf_p);goto yy_find_action;}}else switch ( yy_get_next_buffer(  ) ){case EOB_ACT_END_OF_FILE:{(yy_did_buffer_switch_on_eof) = 0;if ( yywrap( ) ){/* Note: because we've taken care in * yy_get_next_buffer() to have set up * 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 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;elseb->yy_buf_size *= 2;b->yy_ch_buf = (char *)/* Include room in for 2 EOB chars. */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;yyrestart(yyin  );}else{ret_val = EOB_ACT_LAST_MATCH;YY_CURRENT_BUFFER_LVALUE->yy_buffer_status =YY_BUFFER_EOF_PENDING;}}elseret_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 *) 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 >= 9 )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 >= 9 )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 == 8);return yy_is_jam ? 0 : yy_current_state;}    static void yyunput (int c, register char * yy_bp ){register char *yy_cp;        yy_cp = (yy_c_buf_p);/* undo effects of setting up yytext */*yy_cp = (yy_hold_char);if ( yy_cp < YY_CURRENT_BUFFER_LVALUE->yy_ch_buf + 2 ){ /* need to shift things up to make room *//* +2 for EOB chars. */register int number_to_move = (yy_n_chars) + 2;register char *dest = &YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[YY_CURRENT_BUFFER_LVALUE->yy_buf_size + 2];register char *source =&YY_CURRENT_BUFFER_LVALUE->yy_ch_buf[number_to_move];while ( source > YY_CURRENT_BUFFER_LVALUE->yy_ch_buf )*--dest = *--source;yy_cp += (int) (dest - source);yy_bp += (int) (dest - source);YY_CURRENT_BUFFER_LVALUE->yy_n_chars =(yy_n_chars) = YY_CURRENT_BUFFER_LVALUE->yy_buf_size;if ( yy_cp < YY_CURRENT_BUFFER_LVALUE->yy_ch_buf + 2 )YY_FATAL_ERROR( "flex scanner push-back overflow" );}*--yy_cp = (char) c;(yytext_ptr) = yy_bp;(yy_hold_char) = *yy_cp;(yy_c_buf_p) = yy_cp;}#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. */yyrestart(yyin );/*FALLTHROUGH*/case EOB_ACT_END_OF_FILE:{if ( yywrap( ) )return EOF;if ( ! (yy_did_buffer_switch_on_eof) )YY_NEW_FILE;#ifdef __cplusplusreturn yyinput();#elsereturn 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 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 yyrestart  (FILE * input_file ){    if ( ! YY_CURRENT_BUFFER ){        yyensure_buffer_stack ();YY_CURRENT_BUFFER_LVALUE =            yy_create_buffer(yyin,YY_BUF_SIZE );}yy_init_buffer(YY_CURRENT_BUFFER,input_file );yy_load_buffer_state( );}/** Switch to a different input buffer. * @param new_buffer The new input buffer. *  */    void yy_switch_to_buffer  (YY_BUFFER_STATE  new_buffer ){    /* TODO. We should be able to replace this entire function body * with *yypop_buffer_state(); *yypush_buffer_state(new_buffer);     */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;yy_load_buffer_state( );/* We don't actually know whether we did this switch during * EOF (yywrap()) processing, but the only time this flag * is looked at is after yywrap() is called, so it's safe * to go ahead and always set it. */(yy_did_buffer_switch_on_eof) = 1;}static void 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;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 yy_create_buffer  (FILE * file, int  size ){YY_BUFFER_STATE b;    b = (YY_BUFFER_STATE) yyalloc(sizeof( struct yy_buffer_state )  );if ( ! b )YY_FATAL_ERROR( "out of dynamic memory in 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 *) yyalloc(b->yy_buf_size + 2  );if ( ! b->yy_ch_buf )YY_FATAL_ERROR( "out of dynamic memory in yy_create_buffer()" );b->yy_is_our_buffer = 1;yy_init_buffer(b,file );return b;}/** Destroy the buffer. * @param b a buffer created with yy_create_buffer() *  */    void 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 )yyfree((void *) b->yy_ch_buf  );yyfree((void *) b  );}#ifndef __cplusplusextern int isatty (int );#endif /* __cplusplus */    /* Initializes or reinitializes a buffer. * This function is sometimes called more than once on the same buffer, * such as during a yyrestart() or at EOF. */    static void yy_init_buffer  (YY_BUFFER_STATE  b, FILE * file ){int oerrno = errno;    yy_flush_buffer(b );b->yy_input_file = file;b->yy_fill_buffer = 1;    /* If b is the current buffer, then yy_init_buffer was _probably_     * called from 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 = file ? (isatty( fileno(file) ) > 0) : 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 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 )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 yypush_buffer_state (YY_BUFFER_STATE new_buffer ){    if (new_buffer == NULL)return;yyensure_buffer_stack();/* This block is copied from 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 yy_switch_to_buffer. */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 yypop_buffer_state (void){    if (!YY_CURRENT_BUFFER)return;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) {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 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**)yyalloc(num_to_alloc * sizeof(struct yy_buffer_state*));if ( ! (yy_buffer_stack) )YY_FATAL_ERROR( "out of dynamic memory in 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**)yyrealloc((yy_buffer_stack),num_to_alloc * sizeof(struct yy_buffer_state*));if ( ! (yy_buffer_stack) )YY_FATAL_ERROR( "out of dynamic memory in 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 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) yyalloc(sizeof( struct yy_buffer_state )  );if ( ! b )YY_FATAL_ERROR( "out of dynamic memory in 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;yy_switch_to_buffer(b  );return b;}/** Setup the input buffer state to scan a string. The next call to 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 *       yy_scan_bytes() instead. */YY_BUFFER_STATE yy_scan_string (yyconst char * yystr ){    return yy_scan_bytes(yystr,strlen(yystr) );}/** Setup the input buffer state to scan the given bytes. The next call to 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 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 *) yyalloc(n  );if ( ! buf )YY_FATAL_ERROR( "out of dynamic memory in 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 = yy_scan_buffer(buf,n );if ( ! b )YY_FATAL_ERROR( "bad buffer in 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#endifstatic 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 yytext. */ \        int yyless_macro_arg = (n); \        YY_LESS_LINENO(yyless_macro_arg);\yytext[yyleng] = (yy_hold_char); \(yy_c_buf_p) = yytext + yyless_macro_arg; \(yy_hold_char) = *(yy_c_buf_p); \*(yy_c_buf_p) = '\0'; \yyleng = yyless_macro_arg; \} \while ( 0 )/* Accessor  methods (get/set functions) to struct members. *//** Get the current line number. *  */int yyget_lineno  (void){            return yylineno;}/** Get the input stream. *  */FILE *yyget_in  (void){        return yyin;}/** Get the output stream. *  */FILE *yyget_out  (void){        return yyout;}/** Get the length of the current token. *  */int yyget_leng  (void){        return yyleng;}/** Get the current token. *  */char *yyget_text  (void){        return yytext;}/** Set the current line number. * @param line_number *  */void yyset_lineno (int  line_number ){        yylineno = line_number;}/** Set the input stream. This does not discard the current * input buffer. * @param in_str A readable stream. *  * @see yy_switch_to_buffer */void yyset_in (FILE *  in_str ){        yyin = in_str ;}void yyset_out (FILE *  out_str ){        yyout = out_str ;}int yyget_debug  (void){        return yy_flex_debug;}void yyset_debug (int  bdebug ){        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 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    yyin = stdin;    yyout = stdout;#else    yyin = (FILE *) 0;    yyout = (FILE *) 0;#endif    /* For future reference: Set errno on error, since we are called by     * yylex_init()     */    return 0;}/* yylex_destroy is for both reentrant and non-reentrant scanners. */int yylex_destroy  (void){        /* Pop the buffer stack, destroying each element. */while(YY_CURRENT_BUFFER){yy_delete_buffer(YY_CURRENT_BUFFER  );YY_CURRENT_BUFFER_LVALUE = NULL;yypop_buffer_state();}/* Destroy the stack itself. */yyfree((yy_buffer_stack) );(yy_buffer_stack) = NULL;    /* Reset the globals. This is important in a non-reentrant scanner so the next time     * yylex() is called, initialization will occur. */    yy_init_globals( );    return 0;}/* * Internal utility routines. */#ifndef yytext_ptrstatic 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_STRLENstatic int yy_flex_strlen (yyconst char * s ){register int n;for ( n = 0; s[n]; ++n );return n;}#endifvoid *yyalloc (yy_size_t  size ){return (void *) malloc( size );}void *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 yyfree (void * ptr ){free( (char *) ptr );/* see yyrealloc() for (char *) cast */}#define YYTABLES_NAME "yytables"#line 11 "test1.l"main(int argc,char**argv){   yylex();   printf("%d%d%d\n",lines,words,chars);}

编译该程序后，运行，统计出了行数、单词数、字符数。

Administrator@2012-20121224HD /home/flexlinux
$ gcc lex.yy.c -lfl


Administrator@2012-20121224HD /home/flexlinux
$ ./a
hello,world
myhaspl
2-3-20


Administrator@2012-20121224HD /home/flexlinux
$