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      1 /*	$NetBSD: lex.l,v 1.3 2019/12/15 22:50:47 christos Exp $	*/
      2 
      3 %{
      4 /*
      5  * Copyright (c) 1998 - 2017 Kungliga Tekniska Hgskolan
      6  * (Royal Institute of Technology, Stockholm, Sweden).
      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  *
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  *
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  *
     20  * 3. Neither the name of the Institute nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  */
     36 
     37 /*
     38  * This is to handle the definition of this symbol in some AIX
     39  * headers, which will conflict with the definition that lex will
     40  * generate for it.  It's only a problem for AIX lex.
     41  */
     42 
     43 #undef ECHO
     44 
     45 #include "compile_et.h"
     46 #include "parse.h"
     47 #include "lex.h"
     48 
     49 static unsigned lineno = 1;
     50 static int getstring(void);
     51 
     52 #define YY_NO_UNPUT
     53 
     54 #undef ECHO
     55 
     56 %}
     57 
     58 %option nounput
     59 
     60 %%
     61 et			{ return ET; }
     62 error_table		{ return ET; }
     63 ec			{ return EC; }
     64 error_code		{ return EC; }
     65 prefix			{ return PREFIX; }
     66 index			{ return INDEX; }
     67 id			{ return ID; }
     68 end			{ return END; }
     69 [0-9]+			{ yylval.number = atoi(yytext); return NUMBER; }
     70 #[^\n]*			;
     71 [ \t]			;
     72 \n			{ lineno++; }
     73 \"			{ return getstring(); }
     74 [a-zA-Z0-9_]+		{ yylval.string = strdup(yytext); return STRING; }
     75 .			{ return *yytext; }
     76 %%
     77 
     78 int
     79 yywrap ()
     80 {
     81      return 1;
     82 }
     83 
     84 static int
     85 getstring(void)
     86 {
     87     char x[128];
     88     int i = 0;
     89     int c;
     90     int quote = 0;
     91     while(i < sizeof(x) - 1 && (c = input()) != EOF){
     92 	if(quote) {
     93 	    x[i++] = c;
     94 	    quote = 0;
     95 	    continue;
     96 	}
     97 	if(c == '\n'){
     98 	    _lex_error_message("unterminated string");
     99 	    lineno++;
    100 	    break;
    101 	}
    102 	if(c == '\\'){
    103 	    quote++;
    104 	    continue;
    105 	}
    106 	if(c == '\"')
    107 	    break;
    108 	x[i++] = c;
    109     }
    110     x[i] = '\0';
    111     yylval.string = strdup(x);
    112     if (yylval.string == NULL)
    113         err(1, "malloc");
    114     return STRING;
    115 }
    116 
    117 void
    118 _lex_error_message (const char *format, ...)
    119 {
    120      va_list args;
    121 
    122      va_start (args, format);
    123      fprintf (stderr, "%s:%d:", filename, lineno);
    124      vfprintf (stderr, format, args);
    125      va_end (args);
    126      numerror++;
    127 }
    128