Sring help

Code:

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if(strstr(buf,"PING"))
        {
            sscanf(buf,"PING :%s",str);
            printf("BOT WILL SEND BACK %s\n",str);
        }

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the contents of buf is received through a socket.
buf is declared as char buf[1024];
strstr finds PING but sscanf does not place it into str.
In fact, str is blank.
That is the correct format as well so the statement isn't wrong.
Why would be str be coming back black?
Thanks

Is buf null terminated? What does it look like right before the call to sscanf?

Thats the problem I think I'm running into.
It's not null terminated.
How can I add it to the end of the string.
I've tride for looping to the end and then add buf[j] = '\0'; but that doesn't change the outcome.

Keep track of what you've received and add a null terminator at the end?

Code:

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char *p;
p = buf;
while((*p++ = getchar()) != '\n');
*p='\0';

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that should work but still doesn't give me anything back from sscanf

I thought you said the contents came from a socket?

They did.

Code:

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sread = recv(s, buf, sizeof(buf),0); //contents stored in buf

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Code:

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buf[sread] = '\0'; /* ??? */

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That doesn't work either.
I'm really at a lost right now.

Hmm.

Quote:

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Originally Posted by Dave_Sinkula

What does it look like right before the call to sscanf?

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Could it be that PING doesn't start the string and you discard the return value from strstr?

I have error checking on strstr and it's not there.
I print out buf before parsing the string and yes PING starts.
PING :blah.blah.blah

Code:

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#include <stdio.h>
#include <string.h>

int main()
{
  const char buf[] = "yada yada yada PING: some text";
  char str[20];
  const char *ptr = strstr(buf,"PING");
  if ( ptr )
  {
      if ( sscanf(ptr, "PING :&#37;19s", str) == 1 )
      {
        printf("BOT WILL SEND BACK \"%s\"\n", str);
      }
  }
  return 0 ;
}

/* my input/output
BOT WILL SEND BACK "some"
*/

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