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/*
* This file is part of flex.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
f * are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE.
*/
%{
/* A scanner file to build "scanner.c".
Input language is any text.
"#include <filename>" causes a buffer switch.
*/
#include <stdio.h>
#include <stdlib.h>
#include "config.h"
int error = 0;
%}
%option 8bit prefix="test"
%option nounput nomain noyywrap noinput
%option warn
%x GET_FILENAME
%{
#define MAX_INCLUDE_DEPTH 10
YY_BUFFER_STATE include_stack[MAX_INCLUDE_DEPTH];
int include_stack_ptr = 0;
%}
%%
<INITIAL>{
^"#include"[[:blank:]]+"<" { BEGIN(GET_FILENAME); }
.|\n { ECHO; }
}
<GET_FILENAME>{
[[:alnum:]_.-]+> {
/* recurse */
yytext[yyleng-1]='\0';
include_stack[include_stack_ptr++] = YY_CURRENT_BUFFER;
if((yyin=fopen(yytext,"r"))==NULL) {
fprintf(stderr,"*** Error: Could not open include file \"%s\".\n",yytext);
error = 1;
yyterminate();
}
yy_switch_to_buffer( yy_create_buffer( yyin, YY_BUF_SIZE ));
BEGIN(0);
}
.|\n {
fprintf(stderr,"Invalid input \"%s\".\n", yytext);
error = 1;
yyterminate();
}
}
<<EOF>> {
if ( --include_stack_ptr < 0 ) {
yyterminate();
}
else {
fclose(yyin);
yy_delete_buffer( YY_CURRENT_BUFFER );
yy_switch_to_buffer( include_stack[include_stack_ptr] );
}
}
%%
int main(int argc, char** argv);
int
main ( int argc, char** argv )
{
FILE * fp;
if( argc != 2 ) {
fprintf(stderr,"*** Error: Must specify one filename.\n");
exit(-1);
}
if((fp=fopen(argv[1],"r"))==NULL) {
fprintf(stderr,"*** Error: fopen(%s) failed.\n",argv[1]);
exit(-1);
}
yyin = fp;
yyout = stdout;
yylex();
if (!error)
printf("TEST RETURNING OK.\n");
else
exit(-1);
return 0;
}
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