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 Högskolan 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