From d6583bb2a13f329cf0332ef2570eb8bb8fc0e39c Mon Sep 17 00:00:00 2001
From: Theo de Raadt <deraadt@cvs.openbsd.org>
Date: Wed, 18 Oct 1995 08:53:40 +0000
Subject: initial import of NetBSD tree

---
 usr.bin/lex/scan.l | 710 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 710 insertions(+)
 create mode 100644 usr.bin/lex/scan.l

(limited to 'usr.bin/lex/scan.l')

diff --git a/usr.bin/lex/scan.l b/usr.bin/lex/scan.l
new file mode 100644
index 00000000000..2aada16b478
--- /dev/null
+++ b/usr.bin/lex/scan.l
@@ -0,0 +1,710 @@
+/* scan.l - scanner for flex input */
+
+%{
+/*-
+ * Copyright (c) 1990 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Vern Paxson.
+ * 
+ * The United States Government has rights in this work pursuant
+ * to contract no. DE-AC03-76SF00098 between the United States
+ * Department of Energy and the University of California.
+ *
+ * Redistribution and use in source and binary forms are permitted provided
+ * that: (1) source distributions retain this entire copyright notice and
+ * comment, and (2) distributions including binaries display the following
+ * acknowledgement:  ``This product includes software developed by the
+ * University of California, Berkeley and its contributors'' in the
+ * documentation or other materials provided with the distribution and in
+ * all advertising materials mentioning features or use of this software.
+ * Neither the name of the University nor the names of its contributors may
+ * be used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+/* $Header: /cvs/OpenBSD/src/usr.bin/lex/scan.l,v 1.1 1995/10/18 08:45:32 deraadt Exp $ */
+
+#include "flexdef.h"
+#include "parse.h"
+
+#define ACTION_ECHO add_action( yytext )
+#define ACTION_IFDEF(def, should_define) \
+	{ \
+	if ( should_define ) \
+		action_define( def, 1 ); \
+	}
+
+#define MARK_END_OF_PROLOG mark_prolog();
+
+#define YY_DECL \
+	int flexscan()
+
+#define RETURNCHAR \
+	yylval = (unsigned char) yytext[0]; \
+	return CHAR;
+
+#define RETURNNAME \
+	strcpy( nmstr, yytext ); \
+	return NAME;
+
+#define PUT_BACK_STRING(str, start) \
+	for ( i = strlen( str ) - 1; i >= start; --i ) \
+		unput((str)[i])
+
+#define CHECK_REJECT(str) \
+	if ( all_upper( str ) ) \
+		reject = true;
+
+#define CHECK_YYMORE(str) \
+	if ( all_lower( str ) ) \
+		yymore_used = true;
+%}
+
+%option caseless nodefault outfile="scan.c" stack noyy_top_state
+%option nostdinit
+
+%x SECT2 SECT2PROLOG SECT3 CODEBLOCK PICKUPDEF SC CARETISBOL NUM QUOTE
+%x FIRSTCCL CCL ACTION RECOVER COMMENT ACTION_STRING PERCENT_BRACE_ACTION
+%x OPTION LINEDIR
+
+WS		[[:blank:]]+
+OPTWS		[[:blank:]]*
+NOT_WS		[^[:blank:]\n]
+
+NL		\r?\n
+
+NAME		([[:alpha:]_][[:alnum:]_-]*)
+NOT_NAME	[^[:alpha:]_*\n]+
+
+SCNAME		{NAME}
+
+ESCSEQ		(\\([^\n]|[0-7]{1,3}|x[[:xdigit:]]{1,2}))
+
+FIRST_CCL_CHAR	([^\\\n]|{ESCSEQ})
+CCL_CHAR	([^\\\n\]]|{ESCSEQ})
+CCL_EXPR	("[:"[[:alpha:]]+":]")
+
+LEXOPT		[aceknopr]
+
+%%
+	static int bracelevel, didadef, indented_code;
+	static int doing_rule_action = false;
+	static int option_sense;
+
+	int doing_codeblock = false;
+	int i;
+	Char nmdef[MAXLINE], myesc();
+
+
+<INITIAL>{
+	^{WS}		indented_code = true; BEGIN(CODEBLOCK);
+	^"/*"		ACTION_ECHO; yy_push_state( COMMENT );
+	^#{OPTWS}line{WS}	yy_push_state( LINEDIR );
+	^"%s"{NAME}?	return SCDECL;
+	^"%x"{NAME}?	return XSCDECL;
+	^"%{".*{NL}	{
+			++linenum;
+			line_directive_out( (FILE *) 0, 1 );
+			indented_code = false;
+			BEGIN(CODEBLOCK);
+			}
+
+	{WS}		/* discard */
+
+	^"%%".*		{
+			sectnum = 2;
+			bracelevel = 0;
+			mark_defs1();
+			line_directive_out( (FILE *) 0, 1 );
+			BEGIN(SECT2PROLOG);
+			return SECTEND;
+			}
+
+	^"%pointer".*{NL}	yytext_is_array = false; ++linenum;
+	^"%array".*{NL}		yytext_is_array = true; ++linenum;
+
+	^"%option"	BEGIN(OPTION); return OPTION_OP;
+
+	^"%"{LEXOPT}{OPTWS}[[:digit:]]*{OPTWS}{NL}	++linenum; /* ignore */
+	^"%"{LEXOPT}{WS}.*{NL}	++linenum;	/* ignore */
+
+	^"%"[^sxaceknopr{}].*	synerr( _( "unrecognized '%' directive" ) );
+
+	^{NAME}		{
+			strcpy( nmstr, yytext );
+			didadef = false;
+			BEGIN(PICKUPDEF);
+			}
+
+	{SCNAME}	RETURNNAME;
+	^{OPTWS}{NL}	++linenum; /* allows blank lines in section 1 */
+	{OPTWS}{NL}	ACTION_ECHO; ++linenum; /* maybe end of comment line */
+}
+
+
+<COMMENT>{
+	"*/"		ACTION_ECHO; yy_pop_state();
+	"*"		ACTION_ECHO;
+	[^*\n]+		ACTION_ECHO;
+	[^*\n]*{NL}	++linenum; ACTION_ECHO;
+}
+
+<LINEDIR>{
+	\n		yy_pop_state();
+	[[:digit:]]+	linenum = myctoi( yytext );
+
+	\"[^"\n]*\"	{
+			flex_free( (void *) infilename );
+			infilename = copy_string( yytext + 1 );
+			infilename[strlen( infilename ) - 1] = '\0';
+			}
+	.		/* ignore spurious characters */
+}
+
+<CODEBLOCK>{
+	^"%}".*{NL}	++linenum; BEGIN(INITIAL);
+
+	{NAME}|{NOT_NAME}|.	ACTION_ECHO;
+
+	{NL}		{
+			++linenum;
+			ACTION_ECHO;
+			if ( indented_code )
+				BEGIN(INITIAL);
+			}
+}
+
+
+<PICKUPDEF>{
+	{WS}		/* separates name and definition */
+
+	{NOT_WS}.*	{
+			strcpy( (char *) nmdef, yytext );
+
+			/* Skip trailing whitespace. */
+			for ( i = strlen( (char *) nmdef ) - 1;
+			      i >= 0 && (nmdef[i] == ' ' || nmdef[i] == '\t');
+			      --i )
+				;
+
+			nmdef[i + 1] = '\0';
+
+			ndinstal( nmstr, nmdef );
+			didadef = true;
+			}
+
+	{NL}		{
+			if ( ! didadef )
+				synerr( _( "incomplete name definition" ) );
+			BEGIN(INITIAL);
+			++linenum;
+			}
+}
+
+
+<OPTION>{
+	{NL}		++linenum; BEGIN(INITIAL);
+	{WS}		option_sense = true;
+
+	"="		return '=';
+
+	no		option_sense = ! option_sense;
+
+	7bit		csize = option_sense ? 128 : 256;
+	8bit		csize = option_sense ? 256 : 128;
+
+	align		long_align = option_sense;
+	always-interactive	{
+			action_define( "YY_ALWAYS_INTERACTIVE", option_sense );
+			}
+	array		yytext_is_array = option_sense;
+	backup		backing_up_report = option_sense;
+	batch		interactive = ! option_sense;
+	"c++"		C_plus_plus = option_sense;
+	caseful|case-sensitive		caseins = ! option_sense;
+	caseless|case-insensitive	caseins = option_sense;
+	debug		ddebug = option_sense;
+	default		spprdflt = ! option_sense;
+	ecs		useecs = option_sense;
+	fast		{
+			useecs = usemecs = false;
+			use_read = fullspd = true;
+			}
+	full		{
+			useecs = usemecs = false;
+			use_read = fulltbl = true;
+			}
+	input		ACTION_IFDEF("YY_NO_INPUT", ! option_sense);
+	interactive	interactive = option_sense;
+	lex-compat	lex_compat = option_sense;
+	main		{
+			action_define( "YY_MAIN", option_sense );
+			do_yywrap = ! option_sense;
+			}
+	meta-ecs	usemecs = option_sense;
+	never-interactive	{
+			action_define( "YY_NEVER_INTERACTIVE", option_sense );
+			}
+	perf-report	performance_report += option_sense ? 1 : -1;
+	pointer		yytext_is_array = ! option_sense;
+	read		use_read = option_sense;
+	reject		reject_really_used = option_sense;
+	stack		action_define( "YY_STACK_USED", option_sense );
+	stdinit		do_stdinit = option_sense;
+	stdout		use_stdout = option_sense;
+	unput		ACTION_IFDEF("YY_NO_UNPUT", ! option_sense);
+	verbose		printstats = option_sense;
+	warn		nowarn = ! option_sense;
+	yylineno	do_yylineno = option_sense;
+	yymore		yymore_really_used = option_sense;
+	yywrap		do_yywrap = option_sense;
+
+	yy_push_state	ACTION_IFDEF("YY_NO_PUSH_STATE", ! option_sense);
+	yy_pop_state	ACTION_IFDEF("YY_NO_POP_STATE", ! option_sense);
+	yy_top_state	ACTION_IFDEF("YY_NO_TOP_STATE", ! option_sense);
+
+	yy_scan_buffer	ACTION_IFDEF("YY_NO_SCAN_BUFFER", ! option_sense);
+	yy_scan_bytes	ACTION_IFDEF("YY_NO_SCAN_BYTES", ! option_sense);
+	yy_scan_string	ACTION_IFDEF("YY_NO_SCAN_STRING", ! option_sense);
+
+	outfile		return OPT_OUTFILE;
+	prefix		return OPT_PREFIX;
+	yyclass		return OPT_YYCLASS;
+
+	\"[^"\n]*\"	{
+			strcpy( nmstr, yytext + 1 );
+			nmstr[strlen( nmstr ) - 1] = '\0';
+			return NAME;
+			}
+
+	(([a-mo-z]|n[a-np-z])[[:alpha:]\-+]*)|.	{
+			format_synerr( _( "unrecognized %%option: %s" ),
+				yytext );
+			BEGIN(RECOVER);
+			}
+}
+
+<RECOVER>.*{NL}		++linenum; BEGIN(INITIAL);
+
+
+<SECT2PROLOG>{
+	^"%{".*	++bracelevel; yyless( 2 );	/* eat only %{ */
+	^"%}".*	--bracelevel; yyless( 2 );	/* eat only %} */
+
+	^{WS}.*	ACTION_ECHO;	/* indented code in prolog */
+
+	^{NOT_WS}.*	{	/* non-indented code */
+			if ( bracelevel <= 0 )
+				{ /* not in %{ ... %} */
+				yyless( 0 );	/* put it all back */
+				yy_set_bol( 1 );
+				mark_prolog();
+				BEGIN(SECT2);
+				}
+			else
+				ACTION_ECHO;
+			}
+
+	.*		ACTION_ECHO;
+	{NL}	++linenum; ACTION_ECHO;
+
+	<<EOF>>		{
+			mark_prolog();
+			sectnum = 0;
+			yyterminate(); /* to stop the parser */
+			}
+}
+
+<SECT2>{
+	^{OPTWS}{NL}	++linenum; /* allow blank lines in section 2 */
+
+	^{OPTWS}"%{"	{
+			indented_code = false;
+			doing_codeblock = true;
+			bracelevel = 1;
+			BEGIN(PERCENT_BRACE_ACTION);
+			}
+
+	^{OPTWS}"<"	BEGIN(SC); return '<';
+	^{OPTWS}"^"	return '^';
+	\"		BEGIN(QUOTE); return '"';
+	"{"/[[:digit:]]	BEGIN(NUM); return '{';
+	"$"/([[:blank:]]|{NL})	return '$';
+
+	{WS}"%{"		{
+			bracelevel = 1;
+			BEGIN(PERCENT_BRACE_ACTION);
+
+			if ( in_rule )
+				{
+				doing_rule_action = true;
+				in_rule = false;
+				return '\n';
+				}
+			}
+	{WS}"|".*{NL}	continued_action = true; ++linenum; return '\n';
+
+	^{WS}"/*"	{
+			yyless( yyleng - 2 );	/* put back '/', '*' */
+			bracelevel = 0;
+			continued_action = false;
+			BEGIN(ACTION);
+			}
+
+	^{WS}		/* allow indented rules */
+
+	{WS}		{
+			/* This rule is separate from the one below because
+			 * otherwise we get variable trailing context, so
+			 * we can't build the scanner using -{f,F}.
+			 */
+			bracelevel = 0;
+			continued_action = false;
+			BEGIN(ACTION);
+
+			if ( in_rule )
+				{
+				doing_rule_action = true;
+				in_rule = false;
+				return '\n';
+				}
+			}
+
+	{OPTWS}{NL}	{
+			bracelevel = 0;
+			continued_action = false;
+			BEGIN(ACTION);
+			unput( '\n' );	/* so <ACTION> sees it */
+
+			if ( in_rule )
+				{
+				doing_rule_action = true;
+				in_rule = false;
+				return '\n';
+				}
+			}
+
+	^{OPTWS}"<<EOF>>"	|
+	"<<EOF>>"	return EOF_OP;
+
+	^"%%".*		{
+			sectnum = 3;
+			BEGIN(SECT3);
+			yyterminate(); /* to stop the parser */
+			}
+
+	"["({FIRST_CCL_CHAR}|{CCL_EXPR})({CCL_CHAR}|{CCL_EXPR})*	{
+			int cclval;
+
+			strcpy( nmstr, yytext );
+
+			/* Check to see if we've already encountered this
+			 * ccl.
+			 */
+			if ( (cclval = ccllookup( (Char *) nmstr )) != 0 )
+				{
+				if ( input() != ']' )
+					synerr( _( "bad character class" ) );
+
+				yylval = cclval;
+				++cclreuse;
+				return PREVCCL;
+				}
+			else
+				{
+				/* We fudge a bit.  We know that this ccl will
+				 * soon be numbered as lastccl + 1 by cclinit.
+				 */
+				cclinstal( (Char *) nmstr, lastccl + 1 );
+
+				/* Push back everything but the leading bracket
+				 * so the ccl can be rescanned.
+				 */
+				yyless( 1 );
+
+				BEGIN(FIRSTCCL);
+				return '[';
+				}
+			}
+
+	"{"{NAME}"}"	{
+			register Char *nmdefptr;
+			Char *ndlookup();
+
+			strcpy( nmstr, yytext + 1 );
+			nmstr[yyleng - 2] = '\0';  /* chop trailing brace */
+
+			if ( (nmdefptr = ndlookup( nmstr )) == 0 )
+				format_synerr(
+					_( "undefined definition {%s}" ),
+						nmstr );
+
+			else
+				{ /* push back name surrounded by ()'s */
+				int len = strlen( (char *) nmdefptr );
+
+				if ( lex_compat || nmdefptr[0] == '^' ||
+				     (len > 0 && nmdefptr[len - 1] == '$') )
+					{ /* don't use ()'s after all */
+					PUT_BACK_STRING((char *) nmdefptr, 0);
+
+					if ( nmdefptr[0] == '^' )
+						BEGIN(CARETISBOL);
+					}
+
+				else
+					{
+					unput(')');
+					PUT_BACK_STRING((char *) nmdefptr, 0);
+					unput('(');
+					}
+				}
+			}
+
+	[/|*+?.(){}]	return (unsigned char) yytext[0];
+	.		RETURNCHAR;
+}
+
+
+<SC>{
+	[,*]		return (unsigned char) yytext[0];
+	">"		BEGIN(SECT2); return '>';
+	">"/^		BEGIN(CARETISBOL); return '>';
+	{SCNAME}	RETURNNAME;
+	.		{
+			format_synerr( _( "bad <start condition>: %s" ),
+				yytext );
+			}
+}
+
+<CARETISBOL>"^"		BEGIN(SECT2); return '^';
+
+
+<QUOTE>{
+	[^"\n]		RETURNCHAR;
+	\"		BEGIN(SECT2); return '"';
+
+	{NL}		{
+			synerr( _( "missing quote" ) );
+			BEGIN(SECT2);
+			++linenum;
+			return '"';
+			}
+}
+
+
+<FIRSTCCL>{
+	"^"/[^-\]\n]	BEGIN(CCL); return '^';
+	"^"/("-"|"]")	return '^';
+	.		BEGIN(CCL); RETURNCHAR;
+}
+
+<CCL>{
+	-/[^\]\n]	return '-';
+	[^\]\n]		RETURNCHAR;
+	"]"		BEGIN(SECT2); return ']';
+	.|{NL}		{
+			synerr( _( "bad character class" ) );
+			BEGIN(SECT2);
+			return ']';
+			}
+}
+
+<FIRSTCCL,CCL>{
+	"[:alnum:]"	BEGIN(CCL); return CCE_ALNUM;
+	"[:alpha:]"	BEGIN(CCL); return CCE_ALPHA;
+	"[:blank:]"	BEGIN(CCL); return CCE_BLANK;
+	"[:cntrl:]"	BEGIN(CCL); return CCE_CNTRL;
+	"[:digit:]"	BEGIN(CCL); return CCE_DIGIT;
+	"[:graph:]"	BEGIN(CCL); return CCE_GRAPH;
+	"[:lower:]"	BEGIN(CCL); return CCE_LOWER;
+	"[:print:]"	BEGIN(CCL); return CCE_PRINT;
+	"[:punct:]"	BEGIN(CCL); return CCE_PUNCT;
+	"[:space:]"	BEGIN(CCL); return CCE_SPACE;
+	"[:upper:]"	BEGIN(CCL); return CCE_UPPER;
+	"[:xdigit:]"	BEGIN(CCL); return CCE_XDIGIT;
+	{CCL_EXPR}	{
+			format_synerr(
+				_( "bad character class expression: %s" ),
+					yytext );
+			BEGIN(CCL); return CCE_ALNUM;
+			}
+}
+
+<NUM>{
+	[[:digit:]]+	{
+			yylval = myctoi( yytext );
+			return NUMBER;
+			}
+
+	","		return ',';
+	"}"		BEGIN(SECT2); return '}';
+
+	.		{
+			synerr( _( "bad character inside {}'s" ) );
+			BEGIN(SECT2);
+			return '}';
+			}
+
+	{NL}		{
+			synerr( _( "missing }" ) );
+			BEGIN(SECT2);
+			++linenum;
+			return '}';
+			}
+}
+
+
+<PERCENT_BRACE_ACTION>{
+	{OPTWS}"%}".*		bracelevel = 0;
+
+	<ACTION>"/*"		ACTION_ECHO; yy_push_state( COMMENT );
+
+	<CODEBLOCK,ACTION>{
+		"reject"	{
+			ACTION_ECHO;
+			CHECK_REJECT(yytext);
+			}
+		"yymore"	{
+			ACTION_ECHO;
+			CHECK_YYMORE(yytext);
+			}
+	}
+
+	{NAME}|{NOT_NAME}|.	ACTION_ECHO;
+	{NL}		{
+			++linenum;
+			ACTION_ECHO;
+			if ( bracelevel == 0 ||
+			     (doing_codeblock && indented_code) )
+				{
+				if ( doing_rule_action )
+					add_action( "\tYY_BREAK\n" );
+
+				doing_rule_action = doing_codeblock = false;
+				BEGIN(SECT2);
+				}
+			}
+}
+
+
+	/* Reject and YYmore() are checked for above, in PERCENT_BRACE_ACTION */
+<ACTION>{
+	"{"		ACTION_ECHO; ++bracelevel;
+	"}"		ACTION_ECHO; --bracelevel;
+	[^[:alpha:]_{}"'/\n]+	ACTION_ECHO;
+	{NAME}		ACTION_ECHO;
+	"'"([^'\\\n]|\\.)*"'"	ACTION_ECHO; /* character constant */
+	\"		ACTION_ECHO; BEGIN(ACTION_STRING);
+	{NL}		{
+			++linenum;
+			ACTION_ECHO;
+			if ( bracelevel == 0 )
+				{
+				if ( doing_rule_action )
+					add_action( "\tYY_BREAK\n" );
+
+				doing_rule_action = false;
+				BEGIN(SECT2);
+				}
+			}
+	.		ACTION_ECHO;
+}
+
+<ACTION_STRING>{
+	[^"\\\n]+	ACTION_ECHO;
+	\\.		ACTION_ECHO;
+	{NL}		++linenum; ACTION_ECHO;
+	\"		ACTION_ECHO; BEGIN(ACTION);
+	.		ACTION_ECHO;
+}
+
+<COMMENT,ACTION,ACTION_STRING><<EOF>>	{
+			synerr( _( "EOF encountered inside an action" ) );
+			yyterminate();
+			}
+
+
+<SECT2,QUOTE,FIRSTCCL,CCL>{ESCSEQ}	{
+			yylval = myesc( (Char *) yytext );
+
+			if ( YY_START == FIRSTCCL )
+				BEGIN(CCL);
+
+			return CHAR;
+			}
+
+
+<SECT3>{
+	.*(\n?)		ECHO;
+	<<EOF>>		sectnum = 0; yyterminate();
+}
+
+<*>.|\n			format_synerr( _( "bad character: %s" ), yytext );
+
+%%
+
+
+int yywrap()
+	{
+	if ( --num_input_files > 0 )
+		{
+		set_input_file( *++input_files );
+		return 0;
+		}
+
+	else
+		return 1;
+	}
+
+
+/* set_input_file - open the given file (if NULL, stdin) for scanning */
+
+void set_input_file( file )
+char *file;
+	{
+	if ( file && strcmp( file, "-" ) )
+		{
+		infilename = copy_string( file );
+		yyin = fopen( infilename, "r" );
+
+		if ( yyin == NULL )
+			lerrsf( _( "can't open %s" ), file );
+		}
+
+	else
+		{
+		yyin = stdin;
+		infilename = copy_string( "<stdin>" );
+		}
+
+	linenum = 1;
+	}
+
+
+/* Wrapper routines for accessing the scanner's malloc routines. */
+
+void *flex_alloc( size )
+size_t size;
+	{
+	return (void *) malloc( size );
+	}
+
+void *flex_realloc( ptr, size )
+void *ptr;
+size_t size;
+	{
+	return (void *) realloc( ptr, size );
+	}
+
+void flex_free( ptr )
+void *ptr;
+	{
+	if ( ptr )
+		free( ptr );
+	}
-- 
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