Special project

[Julio Jerez]

guys I am working on a project that I will share later.
I am using a utility tha use fopen and I can no change it.

here is my quertion, is ther a way to open a file in memory?

like reading form memory isntera to a file
like:

fscans (file, "&datat)

[Marc]

I'm not entirely sure if your problem is to

0) let the utility, which is a seperate process, use a memory located file (for example created with CreateFile) as an input parameter and open it with fopen
1) have data in the same process and just want to parse it by getting a file handle for it and using the f* functions to read it piece by piece - but everything happens in the same process.

For 0) I had a similar problem once before, but I had access to the src. I changed it to use CreateFile because I didn't find a way to use fopen to access shared memories. I think it's not possible.

For 1) Afaik, FILE always represents a file on the disk or some special things like COM1. The polymorphism required for this is not available.

[Julio Jerez]

0) let the utility, which is a seperate process, use a memory located file (for example created with CreateFile) as an input parameter and open it with fopen

I guess that will be an option, how do I do that?

I am using Lex and Bison and tey use buffered files.
besically I want the option of using a piece of memory af a file.
The other alternative is me writing the lexcal code which Is not and atrcative preprostion.

do you know an alternative to Lex/Bison? tah can use Yacc Grammar

[martinsm]

Lex and Bison can read input from string (const char*). That how I use them in my project.
Here is some information how to do it:
http://stackoverflow.com/questions/7806 ... flex-lexer

[Julio Jerez]

awesome that is exactly what I need.
I use Bison and Yacc in Xenix OS since 1989 and I love it, but I never had to used it reading from a memory buffer before.

Also I was looking for a newer version of Bison, the one I am uing is from 1999
But I can not find any with a visual studio build

[martinsm]

What do you mean - visual studio build? Bison generates y.tab.c/h file, which you compile for your project. Only non-MSVC compatible thing I have found there, that there is #include <unistd.h> directive. And MSVC has no unistd.h file. I get around that by creating empty unistd.h file for MSVC

Latest bison usable from windows probably can be downloaded here: http://gnuwin32.sourceforge.net/packages/bison.htm

[Julio Jerez]

Latest bison usable from windows probably can be downloaded here: http://gnuwin32.sourceforge.net/packages/bison.htm

yes that is it,
I searched in Google some many different phrases like Bison for Win, and Bison for Visual studio and I could not find anything, I do have a working version but it is too old.
Thank you that is what I need.

[Julio Jerez]

well that link takes me to the same link I foudn in me search.
http://ftp.gnu.org/gnu/bison/

but none of those downloads have a Visual Studio project of a binary that I can use.
They used to have VS6 build.

[martinsm]

You need to download this file from there: http://downloads.sourceforge.net/gnuwin ... -setup.exe (Complete package, except sources)
It gives perfectly valid windows binary.
(additionaly you would want to install also flex from same site: http://gnuwin32.sourceforge.net/packages/flex.htm )

[Julio Jerez]

I added this to teh project

Code: Select all

%{
#include <stdafx.h>
#include <stdio.h>
#include <ScriptCompile.h>


#ifdef YYSTYPE
#undef YYSTYPE
#endif

#define YY_NEVER_INTERACTIVE 1
#define YYSTYPE int

#include "scriptgrammar.cpp.h"

// Julio I added this
#define YY_BUFFER_STATE yy_scan_string(const char *str)

void count();
void comment();
int check_type();


%}

...

but it did not work do you know how to I instruct the Lex Grammar to scan from memory buffer?

[martinsm]

I am doing it around yyparse() call:

Code: Select all


typedef struct yy_buffer_state* YY_BUFFER_STATE;
extern YY_BUFFER_STATE yy_scan_string(const char*);
extern void yy_delete_buffer(YY_BUFFER_STATE);
extern int yyparse();

int main()
{
    // ...

    YY_BUFFER_STATE buf = yy_scan_string(memory_buffer);
    yyparse();
    yy_delete_buffer(buf);

    // ...
}

[Julio Jerez]

it work!! awesome teh unly diffrence is tah I used a prefix, but otehr tah tah work like a cham.

Code: Select all

typedef struct yy_buffer_state* YY_BUFFER_STATE;
extern YY_BUFFER_STATE cScript_scan_string(const char*);
extern void cScript_delete_buffer(YY_BUFFER_STATE b);

void* CSriptCompile (const char* program)
{
       YY_BUFFER_STATE buf = cScript_scan_string(program);
        cScriptparse ();
        cScript_delete_buffer(buf);
}