sscanf() issues

Hello,
I would like to check a string, using sscanf, for the format: "http://host:Port/path"

I can't seem to figure it out. What format should I use?
I currently have the following, but it returns 1 instead of 3

Code:

---

sscanf(someString,"http://%s:%d/%s", &host, &port, &path);

---

Any idea?
Thanks.

Don't. Use strstr() instead.

sscanf() puts a value into a variable, but you don't want to do that here. You want to find a string, within a larger string - and that is included in string.h and called strstr().

Well, I would to extract the data from the string. Sorry if I wasn't clear. I want to extract the protocol, the host and the port.

The details of it, depend on the details of the whole original string. Can you post an example of the original string?

Quote:

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Originally Posted by Adak

The details of it, depend on the details of the whole original string. Can you post an example of the original string?

---

http://www.awebsite.com:80/index.html

Ok, I have a bit of a progress here. This looks better, but I'm missing something here, and I dont understand how this really works. I get a different number in port though:

Code:

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sscanf(someString,"http://%[^:]:%d%s",&host,port,&path);

---

> sscanf(someString,"http://%[^:]:%d%s",&host,port,&path);
Well it looks like you removed the & from the wrong one.

Assuming two char arrays, and an int, it would be
sscanf(someString,"http://%[^:]:%d%s",host,&port,path);

Not char array, but simply 2 char pointers. Why does this give me zero in port?

Code:

---

        char* host;
        int port;
        char* path;
       
        sscanf(someString,"http://%[^:]:%d/%[^\n]",&host,&port,&path);
        printf("%s\n",&host);
        printf("%d\n",port);
        printf("%s\n",&path);

---

Because using & on a char pointer to read in a string is just plain wrong.

Which compiler are you using?
If it's gcc / mingw, then use the -Wall flag.

Code:

---

char* host;
int port;
char* path;
       
sscanf(someString,"http://%[^:]:%d/%[^\n]",&host,&port,&path);
printf("%s\n",&host);
printf("%d\n",port);
printf("%s\n",&path);

---

Is that really your code as written? Because you can't read into pointers that aren't pointing anywhere, as you're doing with host and path.

Quote:

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Originally Posted by rags_to_riches

Code:

---

char* host;
int port;
char* path;
       
sscanf(someString,"http://%[^:]:%d/%[^\n]",&host,&port,&path);
printf("%s\n",&host);
printf("%d\n",port);
printf("%s\n",&path);

---

Is that really your code as written? Because you can't read into pointers that aren't pointing anywhere, as you're doing with host and path.

---

I know I'm doing something wrong, obviously, this is not working. Can someone please show me the right way of doing this? not just about the parameters in sscanf, but also the structure of the format. "http://%s:%d/%s" is not good. Can someone shed a light on this as well?
Thanks.

OK guys, It's working now. Can someone please explain to me, since I would like to actually learn what happend here, why this is the right format?

Code:

---

        char host[100];
        char path[100];
        int port;
       
        sscanf(argv[1],"http://%[^:]:%d%*[/]%s",host,&port,path);
        printf("%s\n",host);
        printf("%d\n",port);
        printf("%s\n",path);

---

Thanks.

What can you tell us about

char path[100];

vs.

char *path = malloc( 100 );

vs.

char *path = NULL;


It's also worth trying this.
printf("%p %p %lu\n", (void*)path, (void*)&path, (unsigned long)(sizeof(path)) );

depending on whether path is an array or a pointer.