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/drivers/scsi/aic7xxx/aicasm/aicasm_macro_scan.l

http://github.com/mirrors/linux
LEX | 153 lines | 90 code | 9 blank | 54 comment | 0 complexity | 3c1aa7144931ae9c67ff85f627385792 MD5 | raw file
  1%{
  2/*
  3 * Sub-Lexical Analyzer for macro invokation in 
  4 * the Aic7xxx SCSI Host adapter sequencer assembler.
  5 *
  6 * Copyright (c) 2001 Adaptec Inc.
  7 * All rights reserved.
  8 *
  9 * Redistribution and use in source and binary forms, with or without
 10 * modification, are permitted provided that the following conditions
 11 * are met:
 12 * 1. Redistributions of source code must retain the above copyright
 13 *    notice, this list of conditions, and the following disclaimer,
 14 *    without modification.
 15 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 16 *    substantially similar to the "NO WARRANTY" disclaimer below
 17 *    ("Disclaimer") and any redistribution must be conditioned upon
 18 *    including a substantially similar Disclaimer requirement for further
 19 *    binary redistribution.
 20 * 3. Neither the names of the above-listed copyright holders nor the names
 21 *    of any contributors may be used to endorse or promote products derived
 22 *    from this software without specific prior written permission.
 23 *
 24 * Alternatively, this software may be distributed under the terms of the
 25 * GNU General Public License ("GPL") version 2 as published by the Free
 26 * Software Foundation.
 27 *
 28 * NO WARRANTY
 29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 30 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 31 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 32 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 33 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 37 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 38 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 39 * POSSIBILITY OF SUCH DAMAGES.
 40 *
 41 * $Id: //depot/aic7xxx/aic7xxx/aicasm/aicasm_macro_scan.l#8 $
 42 *
 43 * $FreeBSD$
 44 */
 45
 46#include <sys/types.h>
 47
 48#include <inttypes.h>
 49#include <limits.h>
 50#include <regex.h>
 51#include <stdio.h>
 52#include <string.h>
 53#include <sysexits.h>
 54#include "../queue.h"
 55
 56#include "aicasm.h"
 57#include "aicasm_symbol.h"
 58#include "aicasm_macro_gram.h"
 59
 60#define MAX_STR_CONST 4096
 61static char string_buf[MAX_STR_CONST];
 62static char *string_buf_ptr;
 63static int  parren_count;
 64static char buf[255];
 65int  mmlineno;
 66%}
 67
 68WORD		[A-Za-z_][-A-Za-z_0-9]*
 69SPACE		[ \t]+
 70MCARG		[^(), \t]+
 71
 72%x ARGLIST
 73
 74%%
 75\n			{
 76				++mmlineno;
 77			}
 78\r			;
 79<ARGLIST>{SPACE}	;
 80<ARGLIST>\(		{
 81				parren_count++;
 82				if (parren_count == 1) {
 83					string_buf_ptr = string_buf;
 84					return ('(');
 85				}
 86				*string_buf_ptr++ = '(';
 87			}
 88<ARGLIST>\)		{
 89				if (parren_count == 1) {
 90					if (string_buf_ptr != string_buf) {
 91						/*
 92						 * Return an argument and
 93						 * rescan this parren so we
 94						 * can return it as well.
 95						 */
 96						*string_buf_ptr = '\0';
 97						mmlval.str = string_buf;
 98						string_buf_ptr = string_buf;
 99						unput(')');
100						return T_ARG;
101					}
102					BEGIN INITIAL;
103					return (')');
104				}
105				parren_count--;
106				*string_buf_ptr++ = ')';
107			}
108<ARGLIST>{MCARG}	{
109				char *yptr;
110
111				yptr = mmtext;
112				while (*yptr)
113					*string_buf_ptr++ = *yptr++;
114			}
115<ARGLIST>\,		{
116				if (string_buf_ptr != string_buf) {
117					/*
118					 * Return an argument and
119					 * rescan this comma so we
120					 * can return it as well.
121					 */
122					*string_buf_ptr = '\0';
123					mmlval.str = string_buf;
124					string_buf_ptr = string_buf;
125					unput(',');
126					return T_ARG;
127				}
128				return ',';
129			}
130{WORD}[(]		{
131				/* May be a symbol or a macro invocation. */
132				mmlval.sym = symtable_get(mmtext);
133				if (mmlval.sym->type != MACRO) {
134					stop("Expecting Macro Name",
135					     EX_DATAERR);
136				}
137				unput('(');
138				parren_count = 0;
139				BEGIN ARGLIST;
140				return T_SYMBOL;
141			}
142.			{ 
143				snprintf(buf, sizeof(buf), "Invalid character "
144					 "'%c'", mmtext[0]);
145				stop(buf, EX_DATAERR);
146			}
147%%
148
149int
150mmwrap()
151{
152	stop("EOF encountered in macro call", EX_DATAERR);
153}