#include "net_tools.h"

int create_tcp_client(char* host, char* service) {
    int err, sock;
    struct addrinfo conf;
    struct addrinfo *result, *cursor;

    memset(&conf, 0, sizeof(struct addrinfo));
    conf.ai_family = AF_UNSPEC;
    conf.ai_socktype = SOCK_STREAM;
    conf.ai_flags = 0;
    conf.ai_protocol = 0;

    err = getaddrinfo(host, service, &conf, &result);
    if (err != 0) {
        fprintf(stderr, "Error with getaddrinfo()\n");
        exit(EXIT_FAILURE);
    }

    for (cursor = result; cursor != NULL; cursor = cursor->ai_next) {
        sock = socket(cursor->ai_family, cursor->ai_socktype, cursor->ai_protocol);
        if (sock == -1) continue;
        if (connect(sock, cursor->ai_addr, cursor->ai_addrlen) != -1) break;
        close(sock);
    }

    if (cursor == NULL) {
        fprintf(stderr, "No connect worked\n");
        exit(EXIT_FAILURE);
    }

    freeaddrinfo(result);

    return sock;
}

int read_entity(int fd, void* entity, int size) {
    int remaining = size;
    int total_read = 0;

    while (remaining > 0) {
        int nread = read(fd, ((char*)entity)+total_read, remaining);
        if (nread == -1) {
            return nread;
        }
        remaining -= nread;
        total_read += nread;
    }
    return total_read;
}

void fill_buffer(size_t* written, char* dest, void *src, size_t n) {
    memcpy(dest+*written, src, n);
    *written += n;
}