#include "conn_handler.h"

// Return the maximum socket descriptor set in the argument.
int find_max_fd(const fd_set *fs) {
    int ret = 0;
    for(int i = FD_SETSIZE - 1; i>=0 && ret==0; --i){
        if( FD_ISSET(i, fs) ){
            ret = i;
        }
    }
    return ret;
}

// Return the file descriptor when the listen socket binds a new connection.
int bind_and_listen( const char *service ) {
    struct addrinfo hints;
    struct addrinfo *rp, *result;
    int s;

    /* Build address data structure */
    memset( &hints, 0, sizeof( struct addrinfo ) );
    hints.ai_family = AF_UNSPEC;
    hints.ai_socktype = SOCK_STREAM;
    hints.ai_flags = AI_PASSIVE;
    hints.ai_protocol = 0;

    /* Get local address info */
    if ( ( s = getaddrinfo( NULL, service, &hints, &result ) ) != 0 ) {
        fprintf( stderr, "stream-talk-server: getaddrinfo: %s\n", gai_strerror( s ) );
        return -1;
    }

    /* Iterate through the address list and try to perform passive open */
    for ( rp = result; rp != NULL; rp = rp->ai_next ) {
        if ( ( s = socket( rp->ai_family, rp->ai_socktype, rp->ai_protocol ) ) == -1 ) {
            continue;
        }

        if ( !bind( s, rp->ai_addr, rp->ai_addrlen ) ) {
            break;
        }

        close( s );
    }
    if ( rp == NULL ) {
        perror( "stream-talk-server: bind" );
        return -1;
    }
    if ( listen( s, MAX_PENDING ) == -1 ) {
        perror( "stream-talk-server: listen" );
        close( s );
        return -1;
    }
    freeaddrinfo( result );

    return s;
}