the contents of buf is received through a socket.Code:if(strstr(buf,"PING")) { sscanf(buf,"PING :%s",str); printf("BOT WILL SEND BACK %s\n",str); }
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?
7. It is easier to write an incorrect program than understand a correct one.
40. There are two ways to write error-free programs; only the third one works.*
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?
7. It is easier to write an incorrect program than understand a correct one.
40. There are two ways to write error-free programs; only the third one works.*
that should work but still doesn't give me anything back from sscanfCode:char *p; p = buf; while((*p++ = getchar()) != '\n'); *p='\0';
I thought you said the contents came from a socket?
7. It is easier to write an incorrect program than understand a correct one.
40. There are two ways to write error-free programs; only the third one works.*
They did.
Code:sread = recv(s, buf, sizeof(buf),0); //contents stored in buf
Code:buf[sread] = '\0'; /* ??? */
7. It is easier to write an incorrect program than understand a correct one.
40. There are two ways to write error-free programs; only the third one works.*
That doesn't work either.
I'm really at a lost right now.
Hmm.Could it be that PING doesn't start the string and you discard the return value from strstr?Originally Posted by Dave_Sinkula
7. It is easier to write an incorrect program than understand a correct one.
40. There are two ways to write error-free programs; only the third one works.*
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:#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 :%19s", str) == 1 ) { printf("BOT WILL SEND BACK \"%s\"\n", str); } } return 0 ; } /* my input/output BOT WILL SEND BACK "some" */
7. It is easier to write an incorrect program than understand a correct one.
40. There are two ways to write error-free programs; only the third one works.*
