Hi !

I have a C module, compiled with DMC.
Coming from this C module:

extern (C)
{
  int ccleng;     // strlen(cctext)
  int pos;
  char *cctext;   // point into an input buffer
  int yylex();
}

cctext is a pointer to a buffer allocated by yylex().
the buffer is small and can be freed or overwritten
by yylex();

In the D module, i do:

char[] dtext = toString(cclex);

and dtext get corrupted (not always).

I guess toString do not make a new copy of cctext,
just point to it.

How can i duplicate cctext, in D ? (strdup does not exist ?)
Will the D copy be garbage collected ?

Thanks

Carlos Smith wrote:
> Hi !
> 
> I have a C module, compiled with DMC.
> Coming from this C module:
> 
> extern (C)
> {
>   int ccleng;     // strlen(cctext)
>   int pos;
>   char *cctext;   // point into an input buffer
>   int yylex();
> }
> 
> cctext is a pointer to a buffer allocated by yylex().
> the buffer is small and can be freed or overwritten
> by yylex();
> 
> In the D module, i do:
> 
> char[] dtext = toString(cclex);
> 
> and dtext get corrupted (not always).
> 
> I guess toString do not make a new copy of cctext,
> just point to it.
> 
> How can i duplicate cctext, in D ? (strdup does not exist ?)

char[] dtext = toString(cclex).dup;

> Will the D copy be garbage collected ?
> 

Yes.

-- 
Kirk McDonald
http://kirkmcdonald.blogspot.com
Pyd: Connecting D and Python
http://pyd.dsource.org

"Carlos Smith" <carlos-smith@sympatico.ca> wrote in message news:f5bvrr$2ui6$1@digitalmars.com...
> Hi !
>
> I have a C module, compiled with DMC.
> Coming from this C module:
>
> extern (C)
> {
>  int ccleng;     // strlen(cctext)
>  int pos;
>  char *cctext;   // point into an input buffer
>  int yylex();
> }
>
> cctext is a pointer to a buffer allocated by yylex().
> the buffer is small and can be freed or overwritten
> by yylex();
>
> In the D module, i do:
>
> char[] dtext = toString(cclex);
>
> and dtext get corrupted (not always).
>
> I guess toString do not make a new copy of cctext,
> just point to it.
>
> How can i duplicate cctext, in D ? (strdup does not exist ?)
> Will the D copy be garbage collected ?

Slice and dup!

char[] dtext = cctext[0 .. ccleng].dup;

You can slice pointers to turn them into D arrays, and then you can .dup them to copy the array into a new array.  This duplicated array will not be overwritten by yylex() and will be garbage collected.

"Kirk McDonald" <kirklin.mcdonald@gmail.com> wrote in message news:f5c3ko$3vh$1@digitalmars.com...

NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOooooooo........

"Jarrett Billingsley" <kb3ctd2@yahoo.com> wrote in message
news:f5c3nr$47l$1@digitalmars.com...
: "Kirk McDonald" <kirklin.mcdonald@gmail.com> wrote in
message
: news:f5c3ko$3vh$1@digitalmars.com...
:
: NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOooooooo........
:

Thanks to both of you !

But, i am sorry to say that i dont understand that NO...

What does it means ?

Are you saying that Kirk is wrong ?
Or is it a form of humour ?

Carlos Smith wrote:
> But, i am sorry to say that i dont understand that NO...
> 
> What does it means ?
> 
> Are you saying that Kirk is wrong ?
> Or is it a form of humour ?

I think he was pwned.... :)

Regards, Frank

0ffh wrote:
> Carlos Smith wrote:
> 
>> But, i am sorry to say that i dont understand that NO...
>>
>> What does it means ?
>>
>> Are you saying that Kirk is wrong ?
>> Or is it a form of humour ?
> 
> 
> I think he was pwned.... :)
> 
> Regards, Frank

in his favor, Mr. Billingsley version saves a function call and doesn't need to probe for the end-of-string.

"Carlos Smith" <carlos-smith@sympatico.ca> wrote in message news:f5c4bj$5bp$1@digitalmars.com...
> But, i am sorry to say that i dont understand that NO...
>
> What does it means ?
>
> Are you saying that Kirk is wrong ?
> Or is it a form of humour ?

We just posted at almost exactly the same time with almost exactly the same answer, that's all :)

BCS wrote:
> in his favor, Mr. Billingsley version saves a function call and doesn't need to probe for the end-of-string.

You're right, let's call it a performance-typing tradeoff... :)

Regards, Frank