V10/cmd/flex/flex.skel
/* A lexical scanner generated by flex */
/* scanner skeleton version:
* $Header: flex.skel,v 2.0 89/06/20 15:49:46 vern Locked $
*/
#include <stdio.h>
#define FLEX_SCANNER
/* amount of stuff to slurp up with each read */
#ifndef YY_READ_BUF_SIZE
#define YY_READ_BUF_SIZE 8192
#endif
#ifndef YY_BUF_SIZE
#define YY_BUF_SIZE (YY_READ_BUF_SIZE * 2) /* size of input buffer */
#endif
/* returned upon end-of-file */
#define YY_END_TOK 0
/* copy whatever the last rule matched to the standard output */
#define ECHO fputs( yytext, 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), buf, max_size )) < 0 ) \
YY_FATAL_ERROR( "read() in flex scanner failed" );
#define YY_NULL 0
#define yyterminate() return ( YY_NULL )
/* report a fatal error */
#define YY_FATAL_ERROR(msg) \
{ \
fputs( msg, stderr ); \
putc( '\n', stderr ); \
exit( 1 ); \
}
/* 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 goto new_file
/* default declaration of generated scanner - a define so the user can
* easily add parameters
*/
#ifdef __STDC__
#define YY_DECL int yylex( void )
#else
#define YY_DECL int yylex()
#endif
/* code executed at the end of each rule */
#define YY_BREAK break;
#define YY_END_OF_BUFFER_CHAR 0
/* done after the current pattern has been matched and before the
* corresponding action - sets up yytext
*/
#define YY_DO_BEFORE_ACTION \
yytext = yy_bp; \
yy_hold_char = *yy_cp; \
*yy_cp = '\0'; \
yy_c_buf_p = yy_cp;
/* returns the length of the matched text */
#define yyleng (yy_cp - yy_bp)
#define EOB_ACT_RESTART_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) \
{ \
*yy_cp = yy_hold_char; /* undo effects of setting up yytext */ \
yy_c_buf_p = yy_cp = yy_bp + n; \
YY_DO_BEFORE_ACTION; /* set up yytext again */ \
}
#define unput(c) yyunput( c, yy_bp )
#define YY_USER_ACTION
FILE *yyin = (FILE *) 0, *yyout = (FILE *) 0;
char *yytext;
#ifndef __STDC__
#define const
#endif
%% section 1 code and the data tables for the DFA go here
/* these variables are all declared out here so that section 3 code can
* manipulate them
*/
static char *yy_c_buf_p; /* points to current character in buffer */
static int yy_init = 1; /* whether we need to initialize */
static int yy_start = 0; /* start state number */
/* true when we've seen an EOF for the current input file */
static int yy_eof_has_been_seen;
static int yy_n_chars; /* number of characters read into yy_ch_buf */
/* yy_ch_buf has to be 2 characters longer than YY_BUF_SIZE because we need
* to put in 2 end-of-buffer characters (this is explained where it is
* done) at the end of yy_ch_buf
*/
static char yy_ch_buf[YY_BUF_SIZE + 2];
/* yy_hold_char holds the character lost when yytext is formed */
static char yy_hold_char;
static yy_state_type yy_last_accepting_state;
static char *yy_last_accepting_cpos;
#ifdef __STDC__
static yy_state_type yy_get_previous_state( void );
static int yy_get_next_buffer( void );
static void yyunput( int c, char *buf_ptr );
static int input( void );
static void yyrestart( FILE *input_file );
#else
static yy_state_type yy_get_previous_state();
static int yy_get_next_buffer();
static void yyunput();
static int input();
static void yyrestart();
#endif
YY_DECL
{
register yy_state_type yy_current_state;
register char *yy_cp, *yy_bp;
register int yy_act;
%% user's declarations go here
if ( yy_init )
{
if ( ! yy_start )
yy_start = 1; /* first start state */
if ( ! yyin )
yyin = stdin;
if ( ! yyout )
yyout = stdout;
new_file:
/* this is where we enter upon encountering an end-of-file and
* yywrap() indicating that we should continue processing
*/
/* we put in the '\n' and start reading from [1] so that an
* initial match-at-newline will be true.
*/
yy_ch_buf[0] = '\n';
yy_n_chars = 1;
/* 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.
*/
yy_ch_buf[yy_n_chars] = YY_END_OF_BUFFER_CHAR;
yy_ch_buf[yy_n_chars + 1] = YY_END_OF_BUFFER_CHAR;
yy_eof_has_been_seen = 0;
yytext = yy_c_buf_p = &yy_ch_buf[1];
yy_hold_char = *yy_c_buf_p;
yy_init = 0;
}
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.
*/
%% yymore()-related code goes here
%% code to set up and find next match goes here
/* bogus while loop to let YY_BACK_TRACK, EOB_ACT_LAST_MATCH,
* and EOF actions branch here without introducing an optimizer-
* daunting goto
*/
while ( 1 )
{
%% code to find the action number goes here
YY_DO_BEFORE_ACTION;
YY_USER_ACTION;
#ifdef FLEX_DEBUG
fprintf( stderr, "--accepting rule #%d (\"%s\")\n",
yy_act, yytext );
#endif
do_action: /* this label is used only to access EOF actions */
switch ( yy_act )
{
%% actions go here
case YY_END_OF_BUFFER:
/* undo the effects of YY_DO_BEFORE_ACTION */
*yy_cp = yy_hold_char;
yytext = yy_bp;
switch ( yy_get_next_buffer() )
{
case EOB_ACT_END_OF_FILE:
{
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;
yy_act = YY_STATE_EOF((yy_start - 1) / 2);
goto do_action;
}
else
YY_NEW_FILE;
}
break;
case EOB_ACT_RESTART_SCAN:
yy_c_buf_p = yytext;
yy_hold_char = *yy_c_buf_p;
break;
case EOB_ACT_LAST_MATCH:
yy_c_buf_p = &yy_ch_buf[yy_n_chars];
yy_current_state = yy_get_previous_state();
yy_cp = yy_c_buf_p;
yy_bp = yytext;
continue; /* go to "YY_DO_BEFORE_ACTION" */
}
break;
default:
printf( "action # %d\n", yy_act );
YY_FATAL_ERROR( "fatal flex scanner internal error" );
}
break; /* exit bogus while loop */
}
}
}
/* yy_get_next_buffer - try to read in new buffer
*
* synopsis
* int yy_get_next_buffer();
*
* returns a code representing an action
* EOB_ACT_LAST_MATCH -
* EOB_ACT_RESTART_SCAN - restart the scanner
* EOB_ACT_END_OF_FILE - end of file
*/
static int yy_get_next_buffer()
{
register char *dest = yy_ch_buf;
register char *source = yytext - 1; /* copy prev. char, too */
register int number_to_move, i;
int ret_val;
if ( yy_c_buf_p != &yy_ch_buf[yy_n_chars + 1] )
{
YY_FATAL_ERROR( "NULL in input" );
/*NOTREACHED*/
}
/* try to read more data */
/* first move last chars to start of buffer */
number_to_move = yy_c_buf_p - yytext;
for ( i = 0; i < number_to_move; ++i )
*(dest++) = *(source++);
if ( yy_eof_has_been_seen )
/* don't do the read, it's not guaranteed to return an EOF,
* just force an EOF
*/
yy_n_chars = 0;
else
{
int num_to_read = 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_ch_buf[number_to_move]), yy_n_chars, num_to_read );
}
if ( yy_n_chars == 0 )
{
if ( number_to_move == 1 )
ret_val = EOB_ACT_END_OF_FILE;
else
ret_val = EOB_ACT_LAST_MATCH;
yy_eof_has_been_seen = 1;
}
else
ret_val = EOB_ACT_RESTART_SCAN;
yy_n_chars += number_to_move;
yy_ch_buf[yy_n_chars] = YY_END_OF_BUFFER_CHAR;
yy_ch_buf[yy_n_chars + 1] = YY_END_OF_BUFFER_CHAR;
/* yytext begins at the second character in
* yy_ch_buf; the first character is the one which
* preceded it before reading in the latest buffer;
* it needs to be kept around in case it's a
* newline, so yy_get_previous_state() will have
* with '^' rules active
*/
yytext = &yy_ch_buf[1];
return ( ret_val );
}
/* yy_get_previous_state - get the state just before the EOB char was reached
*
* synopsis
* yy_state_type yy_get_previous_state();
*/
static yy_state_type yy_get_previous_state()
{
register yy_state_type yy_current_state;
register char *yy_cp;
%% code to get the start state into yy_current_state goes here
for ( yy_cp = yytext; yy_cp < yy_c_buf_p; ++yy_cp )
{
%% code to find the next state goes here
}
return ( yy_current_state );
}
#ifdef __STDC__
static void yyunput( int c, register char *yy_bp )
#else
static void yyunput( c, yy_bp )
int c;
register char *yy_bp;
#endif
{
register char *yy_cp = yy_c_buf_p;
*yy_cp = yy_hold_char; /* undo effects of setting up yytext */
if ( yy_cp < yy_ch_buf + 2 )
{ /* need to shift things up to make room */
register int number_to_move = yy_n_chars + 2; /* +2 for EOB chars */
register char *dest = &yy_ch_buf[YY_BUF_SIZE + 2];
register char *source = &yy_ch_buf[number_to_move];
while ( source > yy_ch_buf )
*--dest = *--source;
yy_cp += dest - source;
yy_bp += dest - source;
if ( yy_cp < yy_ch_buf + 2 )
YY_FATAL_ERROR( "flex scanner push-back overflow" );
}
if ( yy_cp > yy_bp && yy_cp[-1] == '\n' )
yy_cp[-2] = '\n';
*--yy_cp = c;
YY_DO_BEFORE_ACTION; /* set up yytext again */
}
static int input()
{
int c;
char *yy_cp = yy_c_buf_p;
*yy_cp = yy_hold_char;
if ( *yy_c_buf_p == YY_END_OF_BUFFER_CHAR )
{ /* need more input */
yytext = yy_c_buf_p;
++yy_c_buf_p;
switch ( yy_get_next_buffer() )
{
/* this code, unfortunately, is somewhat redundant with
* that above
*/
case EOB_ACT_END_OF_FILE:
{
if ( yywrap() )
{
yy_c_buf_p = yytext;
return ( EOF );
}
yy_ch_buf[0] = '\n';
yy_n_chars = 1;
yy_ch_buf[yy_n_chars] = YY_END_OF_BUFFER_CHAR;
yy_ch_buf[yy_n_chars + 1] = YY_END_OF_BUFFER_CHAR;
yy_eof_has_been_seen = 0;
yytext = yy_c_buf_p = &yy_ch_buf[1];
yy_hold_char = *yy_c_buf_p;
return ( input() );
}
break;
case EOB_ACT_RESTART_SCAN:
yy_c_buf_p = yytext;
break;
case EOB_ACT_LAST_MATCH:
YY_FATAL_ERROR( "unexpected last match in input()" );
}
}
c = *yy_c_buf_p;
yy_hold_char = *++yy_c_buf_p;
return ( c );
}
#ifdef __STDC__
static void yyrestart( FILE *input_file )
#else
static void yyrestart( input_file )
FILE *input_file;
#endif
{
if ( yyin != stdin )
fclose( yyin );
yyin = input_file;
yy_init = 1;
}