Hi Ervin,
according to the lex&yacc manual, there should be a yy_create_buffer called
at the beginning, corresponding to the yy_delete_buffer.
I don't see it in your code.
the example is here:
https://github.com/mbbill/flexbison/blob/master/flexbison/fb2-3.l
Regards.
Giacinto
On Mon, Aug 17, 2020 at 6:30 PM Ervin Hegedüs <airw...@gmail.com> wrote:
> Hi there,
>
> I ran into a problem: the language to be analyzed has a speciel
> expression, eg:
>
> include foo.conf
>
> which means "find and open the file foo.conf, and parse it!".
>
> Here is how I solve that:
>
> in my lexer:
>
> <INITIAL>include[ \t]+[0-9A-Za-z_\/\.\-\*\:]+ { push_sym();
> handle_include((const char *)yytext); return T_INCLUDE_DIRECTIVE_WITH_PATH;
> }
>
> in the parser:
>
> config_include:
> T_INCLUDE_DIRECTIVE_WITH_PATH { free($1); }
> ;
>
> the push_sym():
>
> void push_sym() {
> yylval.s = strdup(yytext);
> if (yylval.s[strlen(yytext)-1] == '\n') {
> yylval.s[strlen(yytext)-1] = '\0';
> }
> }
>
> the handle_include() does a split by space, to get the filename,
> and call open_and_parse(char * fname);
>
> There is a speciel function which opens the input file, and runs
> the parser:
>
> int file_inclusion_level = 0; // a global variable to count the
> inclusion depth
>
> int open_and_parse(char * fname) {
>
> FILE *fp;
> ...
> YY_BUFFER_STATE bufftemp = NULL;
>
> ...
>
> if(fp = fopen(...)) {
> file_inclusion_level++;
>
> if (file_inclusion_level == 1) {
> yy_scan_string(inputbuff);
> }
>
> if (file_inclusion_level > 1) {
> bufftemp = YY_CURRENT_BUFFER;
> yy_scan_string(inputbuff);
> }
>
> yyparse();
>
> if (file_inclusion_level > 1) {
> yy_delete_buffer(YY_CURRENT_BUFFER);
> yy_switch_to_buffer(bufftemp);
> }
>
> fclose(fp);
> file_inclusion_level--;
> yy_flex_destroy();
> }
>
>
> When I run the compiled code, I got a fault:
>
> malloc_consolidate(): invalid chunk size
> Aborted
>
>
> There is a "main" config file with name test_inc_01.conf, which hase two
> lines:
>
> include test_inc_02.conf
> include test_inc_03.conf
>
> Both files have 2 lines:
>
> include test_inc_21.conf
> include test_inc_22.conf
>
> and
>
> include test_inc_31.conf
> include test_inc_32.conf
>
> All 4 files have just a simple config line with few tokens. The
> parser works as well when I'm just parsing the files with
> "relevant" content. But if I pass the test_inc_02.conf (which
> have 2 relevant files - see above), the malloc_consolidate()
> comes again.
>
>
> What's the correct way to handle of "include" methods?
>
>
> Thanks,
>
>
>
> a.
>
>
>
>
