1 /* 2 * This file is part of flex. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 f * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21 * PURPOSE. 22 */ 23 24 %{ 25 /* A scanner file to build "scanner.c". 26 Input language is any text. 27 "#include <filename>" causes a buffer switch. 28 */ 29 #include <stdio.h> 30 #include <stdlib.h> 31 #include "config.h" 32 33 int error = 0; 34 %} 35 36 %option 8bit prefix="test" 37 %option nounput nomain noyywrap noinput 38 %option warn 39 40 %x GET_FILENAME 41 %{ 42 43 #define MAX_INCLUDE_DEPTH 10 44 YY_BUFFER_STATE include_stack[MAX_INCLUDE_DEPTH]; 45 int include_stack_ptr = 0; 46 %} 47 %% 48 49 <INITIAL>{ 50 ^"#include"[[:blank:]]+"<" { BEGIN(GET_FILENAME); } 51 .|\n { ECHO; } 52 } 53 54 <GET_FILENAME>{ 55 [[:alnum:]_.-]+> { 56 /* recurse */ 57 yytext[yyleng-1]='\0'; 58 include_stack[include_stack_ptr++] = YY_CURRENT_BUFFER; 59 if((yyin=fopen(yytext,"r"))==NULL) { 60 fprintf(stderr,"*** Error: Could not open include file \"%s\".\n",yytext); 61 error = 1; 62 yyterminate(); 63 } 64 yy_switch_to_buffer( yy_create_buffer( yyin, YY_BUF_SIZE )); 65 BEGIN(0); 66 } 67 .|\n { 68 fprintf(stderr,"Invalid input \"%s\".\n", yytext); 69 error = 1; 70 yyterminate(); 71 } 72 } 73 74 <<EOF>> { 75 if ( --include_stack_ptr < 0 ) { 76 yyterminate(); 77 } 78 else { 79 fclose(yyin); 80 yy_delete_buffer( YY_CURRENT_BUFFER ); 81 yy_switch_to_buffer( include_stack[include_stack_ptr] ); 82 } 83 } 84 85 %% 86 87 int main(int argc, char** argv); 88 89 int 90 main ( int argc, char** argv ) 91 { 92 FILE * fp; 93 if( argc != 2 ) { 94 fprintf(stderr,"*** Error: Must specify one filename.\n"); 95 exit(-1); 96 } 97 if((fp=fopen(argv[1],"r"))==NULL) { 98 fprintf(stderr,"*** Error: fopen(%s) failed.\n",argv[1]); 99 exit(-1); 100 } 101 yyin = fp; 102 yyout = stdout; 103 yylex(); 104 if (!error) 105 printf("TEST RETURNING OK.\n"); 106 else 107 exit(-1); 108 return 0; 109 } 110