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/crypto/heimdal/lib/sl/slc-lex.l

https://bitbucket.org/freebsd/freebsd-head/
LEX | 160 lines | 112 code | 15 blank | 33 comment | 0 complexity | a9dceef63490f3d57378464ef988fa18 MD5 | raw file
  1%{
  2/*
  3 * Copyright (c) 2004 Kungliga Tekniska Hรถgskolan
  4 * (Royal Institute of Technology, Stockholm, Sweden).
  5 * All rights reserved.
  6 *
  7 * Redistribution and use in source and binary forms, with or without
  8 * modification, are permitted provided that the following conditions
  9 * are met:
 10 *
 11 * 1. Redistributions of source code must retain the above copyright
 12 *    notice, this list of conditions and the following disclaimer.
 13 *
 14 * 2. Redistributions in binary form must reproduce the above copyright
 15 *    notice, this list of conditions and the following disclaimer in the
 16 *    documentation and/or other materials provided with the distribution.
 17 *
 18 * 3. Neither the name of the Institute nor the names of its contributors
 19 *    may be used to endorse or promote products derived from this software
 20 *    without specific prior written permission.
 21 *
 22 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 32 * SUCH DAMAGE.
 33 */
 34
 35/* $Id$ */
 36
 37#undef ECHO
 38
 39#include <stdio.h>
 40#include <string.h>
 41#include <stdarg.h>
 42#include <stdlib.h>
 43#include "slc.h"
 44#include "slc-gram.h"
 45unsigned lineno = 1;
 46
 47static void handle_comment(void);
 48static char * handle_string(void);
 49
 50#define YY_NO_UNPUT
 51
 52#undef ECHO
 53
 54%}
 55
 56%option nounput
 57
 58%%
 59[A-Za-z][-A-Za-z0-9_]*	{
 60			  yylval.string = strdup ((const char *)yytext);
 61			  return LITERAL;
 62			}
 63"\""			{ yylval.string = handle_string(); return STRING; }
 64\n			{ ++lineno; }
 65\/\*			{ handle_comment(); }
 66[={}]			{ return *yytext; }
 67[ \t]			;
 68%%
 69
 70void
 71error_message (const char *format, ...)
 72{
 73     va_list args;
 74
 75     va_start (args, format);
 76     fprintf (stderr, "%s:%d: ", filename, lineno);
 77     vfprintf (stderr, format, args);
 78     va_end (args);
 79     error_flag++;
 80}
 81
 82void
 83yyerror (char *s)
 84{
 85    error_message("%s\n", s);
 86}
 87
 88static void
 89handle_comment(void)
 90{
 91    int c;
 92    int start_lineno = lineno;
 93    int level = 1;
 94    int seen_star = 0;
 95    int seen_slash = 0;
 96    while((c = input()) != EOF) {
 97	if(c == '/') {
 98	    if(seen_star) {
 99		if(--level == 0)
100		    return;
101		seen_star = 0;
102		continue;
103	    }
104	    seen_slash = 1;
105	    continue;
106	} else if(c == '*') {
107	    if(seen_slash) {
108		level++;
109		seen_star = seen_slash = 0;
110		continue;
111	    }
112	    seen_star = 1;
113	    continue;
114	}
115	seen_star = seen_slash = 0;
116	if(c == '\n') {
117	    lineno++;
118	    continue;
119	}
120    }
121    if(c == EOF)
122	error_message("unterminated comment, possibly started on line %d\n", start_lineno);
123}
124
125static char *
126handle_string(void)
127{
128    char x[1024];
129    int i = 0;
130    int c;
131    int quote = 0;
132    while((c = input()) != EOF){
133	if(quote) {
134	    x[i++] = '\\';
135	    x[i++] = c;
136	    quote = 0;
137	    continue;
138	}
139	if(c == '\n'){
140	    error_message("unterminated string");
141	    lineno++;
142	    break;
143	}
144	if(c == '\\'){
145	    quote++;
146	    continue;
147	}
148	if(c == '\"')
149	    break;
150	x[i++] = c;
151    }
152    x[i] = '\0';
153    return strdup(x);
154}
155
156int
157yywrap ()
158{
159     return 1;
160}