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I am trying to use the strstr function but it doesn't seem to work with a
dynamically allocated string that I pass into a function.

Specifically, I am using a Macromedia C-level extensibility and the
JavaScript interpreter to write an extension.

http://livedocs.macromedia.com/dream...e2.htm#wp80297

http://livedocs.macromedia.com/dream...tml/wwhelp.htm


While the example in the link above doesn't input 2 strings for me to do a
strstr function, my custom function does.

So something like this seem to work:

char const *stringBIG, *strSUB;
char *stringBIGIndex;
stringBIGIndex= strstr("this is a test", "test"); // this is a const and
it works

HOWEVER, this doesn't seem to work:

char const *stringBIG, *strSUB;
char *stringBIGIndex;
unsigned int strSUBlen, stringBIGlen;

// Convert the stringBIG to a string
stringBIG = JS_ValueToString(cx, argv[0], &stringBIGlen);

strSUB= JS_ValueToString(cx, argv[1], &strSUBlen);

stringBIGIndex= strstr(*stringBIG , *strSUB);


So, if you have a spelled out hard coded constant string, like "this is a
test", it works. But if I want to pass a string dynamically in, convert it
and use the strstr function it doesn't.

I also tried declaring the line
char const *stringBIG, *strSUB;

previously without the const keyword
char *stringBIG, *strSUB;

And that didn't seem to work originally, so I added the const in there.
Still no success.

I am trying to use the <string.h> library but I can't seem to use it in
practical manner.


Thanks.

smnoff said:

<snip>

> char const *stringBIG, *strSUB;

<snip>

> stringBIGIndex= strstr(*stringBIG , *strSUB);

strstr takes const char *, not const char. If stringBIG and strSUB are
pointing to valid strings, then you just need to do this:

stringBIGIndex= strstr(stringBIG , strSUB);

--
Richard Heathfield
"Usenet is a strange place" - dmr 29/7/1999
http://www.cpax.org.uk
email: rjh at above domain (but drop the www, obviously)

smnoff wrote:
> I am trying to use the strstr function but it doesn't seem to work with a
> dynamically allocated string that I pass into a function.
>
> Specifically, I am using a Macromedia C-level extensibility and the
> JavaScript interpreter to write an extension.
>
> http://livedocs.macromedia.com/dream...e2.htm#wp80297
>
> http://livedocs.macromedia.com/dream...tml/wwhelp.htm
>
>
> While the example in the link above doesn't input 2 strings for me to do a
> strstr function, my custom function does.
>
> So something like this seem to work:
>
> char const *stringBIG, *strSUB;
> char *stringBIGIndex;
> stringBIGIndex= strstr("this is a test", "test"); // this is a const and
> it works
>
> HOWEVER, this doesn't seem to work:
>
> char const *stringBIG, *strSUB;
> char *stringBIGIndex;
> unsigned int strSUBlen, stringBIGlen;
>
> // Convert the stringBIG to a string
> stringBIG = JS_ValueToString(cx, argv[0], &stringBIGlen);
>
> strSUB= JS_ValueToString(cx, argv[1], &strSUBlen);
>
> stringBIGIndex= strstr(*stringBIG , *strSUB);

Should be:
stringBIGIndex = strstr(stringBIG, strSUB);

Robert
>
>
> So, if you have a spelled out hard coded constant string, like "this is a
> test", it works. But if I want to pass a string dynamically in, convert it
> and use the strstr function it doesn't.
>
> I also tried declaring the line
> char const *stringBIG, *strSUB;
>
> previously without the const keyword
> char *stringBIG, *strSUB;
>
> And that didn't seem to work originally, so I added the const in there.
> Still no success.
>
> I am trying to use the <string.h> library but I can't seem to use it in
> practical manner.
>
>
> Thanks.
>
>
>
>
>
>
>
>
>
>

It worked when I didn't include the * in strstr as you recommended. Thanks.

Now, I am trying to understand why it worked. I guess when I used the line:

stringBIGIndex= strstr(*stringBIG , *strSUB);

I was already dereferencing to the value? As opposed to just sticking in a
auto allocated variable name?

I guess when I declared this line
char const *stringBIG, *strSUB;

I don't have to separately declare:

char const stringBIG, strSUB; // no * pointer here and because of the
first one above, why?

I know it does it, but don't know how and why it does it.

Can someone please explain?



"Richard Heathfield" <> wrote in message
news:...
> smnoff said:
>
> <snip>
>
>> char const *stringBIG, *strSUB;
>
> <snip>
>
>> stringBIGIndex= strstr(*stringBIG , *strSUB);
>
> strstr takes const char *, not const char. If stringBIG and strSUB are
> pointing to valid strings, then you just need to do this:
>
> stringBIGIndex= strstr(stringBIG , strSUB);
>
> --
> Richard Heathfield
> "Usenet is a strange place" - dmr 29/7/1999
> http://www.cpax.org.uk
> email: rjh at above domain (but drop the www, obviously)

On Tue, 6 Jun 2006 10:54:56 -0500, "smnoff" <>
wrote:

>I am trying to use the strstr function but it doesn't seem to work with a
>dynamically allocated string that I pass into a function.
>
>Specifically, I am using a Macromedia C-level extensibility and the
>JavaScript interpreter to write an extension.
>
>http://livedocs.macromedia.com/dream...e2.htm#wp80297
>
>http://livedocs.macromedia.com/dream...tml/wwhelp.htm
>
>
>While the example in the link above doesn't input 2 strings for me to do a
>strstr function, my custom function does.
>
>So something like this seem to work:
>
> char const *stringBIG, *strSUB;
> char *stringBIGIndex;
> stringBIGIndex= strstr("this is a test", "test"); // this is a const and
>it works

it seems to me str* name are reserved for the compiler
so the above is wrong