/* is_seqnum_cl.c

   A simple Internet stream socket client. This client requests a sequence
   number from the server.

   See also is_seqnum_sv.c.
*/
#include <netdb.h>
#include "is_seqnum.h"

int
main(int argc, char *argv[])
{
    char request[1024];                    /* Requested length of sequence */
    char response[1024];
    int cfd;
    ssize_t numRead;
    struct addrinfo hints;
    struct addrinfo *result, *rp;

    if (argc < 2 || strcmp(argv[1], "--help") == 0)
        printf("%s server-host\n", argv[0]);

    /* Call getaddrinfo() to obtain a list of addresses that
       we can try connecting to */

    memset(&hints, 0, sizeof(struct addrinfo));
    hints.ai_canonname = NULL;
    hints.ai_addr = NULL;
    hints.ai_next = NULL;
    hints.ai_family = AF_UNSPEC;                /* Allows IPv4 or IPv6 */
    hints.ai_socktype = SOCK_STREAM;
    hints.ai_flags = AI_NUMERICSERV;

    if (getaddrinfo(argv[1], PORT_NUM, &hints, &result) != 0)
        err_exit(errno, "getaddrinfo");

    /* Walk through returned list until we find an address structure
       that can be used to successfully connect a socket */

    for (rp = result; rp != NULL; rp = rp->ai_next) {
        cfd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
        if (cfd == -1)
            continue;                           /* On error, try next address */

        if (connect(cfd, rp->ai_addr, rp->ai_addrlen) != -1)
            break;                              /* Success */

        /* Connect failed: close this socket and try next address */

        close(cfd);
    }

    if (rp == NULL)
        err_exit(errno, "Could not connect socket to any address");

    freeaddrinfo(result);

    /* Send requested sequence length, with terminating newline */

    fputs("request:", stdout);
    if(fgets(request, 1024, stdin) != NULL) {
      if (write(cfd, request, strlen(request)) !=  strlen(request))
        err_exit(errno, "Partial/failed write (reqLenStr)");

        numRead = readLine(cfd, response, 1024);
        if (numRead == -1)
            err_exit(errno, "readLine");
        if (numRead == 0)
            err_exit(errno, "Unexpected EOF from server");

        printf("response: %s", response);   /* Includes '\n' */
        puts("request:");
    }
    exit(EXIT_SUCCESS);
}