CODEWITHSUNDEEP
clinuxsocketsclientserver
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Reputation: 177

Readin from socket to buffer, then read line by line from buffer to implement http language

Everything I am dealing with is written in c language. I am sending a request to a database server(in c), the server returns the information, I am able to read it from the socket. My question is now that I have it in a buffer, it is stored as such:

[info here] [info here] \n
[info here] [info here] \n

I need to be able to extract each line in order to add:

<tr><td> [info here] [info here] \n

put it back onto another buffer and send that back into another socket going into a website.

This is the code I am implementing but it's not exiting the loop:

FILE *fp = fdopen(db_sockfd, "r");
while(fgets(buff, sizeof(buff), fp))
{
    sprintf(db_buffer, "<tr><td>%s", buff);
    send(newsockfd, db_buffer, strlen(db_buffer),0);
}

Upvotes: 1

Views: 1946

Answers (1)

Parham Alvani
Parham Alvani

Reputation: 2440

I think you can use fdopen() function and changed your socket fd (file descriptor) into FILE* and then use functions like fgets() in order to read lines. this solution works on linux.
for you while loop I use following code and it worked OK:

int main(int argc, char *argv[])
{
    int server_socket_fd;
    int sck;
    FILE *fp;
    char buffer[1024];  
    char buff[1024];
    struct sockaddr_in server_addr;

    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    server_addr.sin_port = htons(1373);

    server_socket_fd = socket(AF_INET, SOCK_STREAM, 0);
    if (server_socket_fd == -1)
        perror("socket()");

    if (bind(server_socket_fd, (struct sockaddr *)&server_addr,
                sizeof(server_addr)) == -1)
        perror("bind()");

    if (listen(server_socket_fd, 10) == -1)
        perror("listen()"); 

    sck = accept(server_socket_fd, NULL, NULL);
    fp = fdopen(sck, "r");  
    while(fgets(buff, sizeof(buff), fp)) {
            sprintf(buffer, "<tr><td>%s", buff);
            send(sck, buffer, strlen(buffer), 0);
    }   
}

this code exit from while loop when error occurred or when client close connection.

Upvotes: 1

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