Question

I’m trying to code an IRC bot. The bot connects to the server, however I can’t get it to join a channel.

int conn;
char sbuf[512];

// Function I'm trying to use
void join(char *fmt, ...){
    va_list ap;
    va_start(ap,fmt);
    vsnprintf(sbuf,512, fmt,ap);
    va_end(ap);

    printf("<< %s",sbuf);
    write(conn,sbuf,strlen(sbuff));
}

// in main function 
int main(){
    const char * chanm = "test";

    // Here is where I get my error, line 38
    join("JOIN %s\r\n", chanm);
}

Can someone please tell me what am I doing wrong?

I get the error message:
ircbot.c:38 warning: deprecated conversion from string constant to char*

Answer 1

Change your function heading to:

void join(const char *fmt, ...){

The problem is that "JOIN %s\r\n" is a constant string, and you were trying to pass it to a non-constant char *. Since you don’t intend to modify fmt within your join function, you should declare it as const char *fmt.