Concatenating char buffer into a string

Question

In the following snippet, I receive the data until I have completely received all the data from the socket client. I keep on storing the data in a char buffer of size 300.

Answer 1

You can do this something like the following. I assume that buffer does not contain a string.

ssize_t b;
char buffer[300]
size_t n = 1;
char *s = calloc( 1, sizeof( char ) );

while((b = recv(socket_fd,buffer,sizeof(buffer))) > 0) {

    char *tmp = realloc( s, b + n );

    if ( !tmp )
    {
        // report an error
        break;
    }

    s = tmp;
    memcpy( s + n - 1, buffer, b );
    n += b;
    s[n - 1] = '\0';  
}