#define LF 10
#define CR 13
#define NUL 0

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h> 

char *strcat(char *s1, const char *s2);
int  connect(int socket, const struct sockaddr *address, socklen_t address_len);
void bzero(char *s, int n);
char *strcpy (const char *dest,const char *src);
int  strlen(const char *string);
int  read(int sockfd, char *buf, unsigned int nbytes);
int  write(int sockfd, char *buf, unsigned int nbytes);
void bcopy(const void *s1, void *s2, size_t n);
void exit(int status);

void error(char *msg)
{
    perror(msg);
    exit(0);
}

int main(int argc, char *argv[])
{
    int sockfd, portno, n, i;
    struct sockaddr_in serv_addr;
    struct hostent *server;

    printf( "444444444444444444444444444444444444444444444444444444444444444444444444\n" );


    char crlfstr[3];
    crlfstr[0] = CR; 
    crlfstr[1] = LF;
    crlfstr[2] = NUL;

    char buffer[256];
    
    portno = 80;
    sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if (sockfd < 0) 
        error("ERROR opening socket");
    server = gethostbyname("abebooks.com");
    if (server == NULL) {
        fprintf(stderr,"ERROR, no such host\n");
        exit(0);
    }
    bzero((char *) &serv_addr, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    bcopy((char *)server->h_addr, 
         (char *)&serv_addr.sin_addr.s_addr,
         server->h_length);
    serv_addr.sin_port = htons(portno);
    if (connect( sockfd, &serv_addr, sizeof(serv_addr) ) < 0) 
        error("ERROR connecting");

    bzero(buffer,256);

    strcpy( buffer, "POST " );
    strcat( buffer, "/servlet/SearchResults?isbn=0380718774" );
    strcat( buffer, " HTTP/1.1" );
    strcat( buffer, crlfstr );

    strcat( buffer, "Content-Type:application/x-www-form-urlencoded" );
    strcat( buffer, crlfstr );

    strcat( buffer, "Host: www.abebooks.com" );

    strcat( buffer, crlfstr );

    strcat( buffer, crlfstr ); //blank line

    strcat( buffer, crlfstr );  //terminal blank line

    printf("%s\n", buffer );


    n = write(sockfd,buffer,strlen(buffer));
    if (n < 0) {
      error("ERROR writing to socket");
    }
    else printf( "Wrote to socket without errors\n"); 

    for ( i =1; i<=50; i++){
      bzero(buffer,256);
      n = read(sockfd,buffer,255);
      if (n < 0) {
         error("ERROR - reading from socket");
      } else printf("%s\n",buffer);
    }
    
    printf( "===================================================================\n" );
    return 0;
}