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 * 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
34 %option 8bit prefix="test"
35 %option nounput nomain noyywrap noinput
36 %option warn
37
38 %x GET_FILENAME
39
40 %%
41
42 <INITIAL>{
43 ^"#include"[[:blank:]]+"<" { BEGIN(GET_FILENAME); }
44 .|\n { ECHO; }
45 }
46
47 <GET_FILENAME>{
48 [[:alnum:]_.-]+> {
49 /* recurse */
50 yytext[yyleng-1]='\0';
51 if((yyin=fopen(yytext,"r"))==NULL) {
52 fprintf(stderr,"*** Error: Could not open include file \"%s\".\n",yytext);
53 yyterminate();
54 }
55 yypush_buffer_state( yy_create_buffer( yyin, YY_BUF_SIZE ));
56 BEGIN(0);
57 }
58 .|\n {
59 fprintf(stderr,"Invalid input \"%s\".\n", yytext);
60 yyterminate();
61 }
62 }
63
64 <<EOF>> {
65 fclose(yyin);
66 yypop_buffer_state();
67 if(!YY_CURRENT_BUFFER)
68 yyterminate();
69 }
70
71 %%
72
73 int main(int argc, char** argv);
74
75 int
main(int argc,char ** argv)76 main ( int argc, char** argv )
77 {
78 FILE * fp;
79 if( argc != 2 ) {
80 fprintf(stderr,"*** Error: Must specify one filename.\n");
81 exit(-1);
82 }
83 if((fp=fopen(argv[1],"r"))==NULL) {
84 fprintf(stderr,"*** Error: fopen(%s) failed.\n",argv[1]);
85 exit(-1);
86 }
87 yyin = fp;
88 yyout = stdout;
89 yylex();
90 printf("TEST RETURNING OK.\n");
91 return 0;
92 }
93