TCP-Socket/socketFunctions.h at master · btc989/TCP-Socket · GitHub

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int read_line (int fd, char *ptr, int line_size)
{
    int n;
    int rc;
    char c;

    for (n = 1; n < line_size; n++)
    {
        if ((rc = read_n (fd, &c, 1)) == 1)
        {
	    *ptr++ = c;
	    if (c == '\n')
	    {
	        break;
            }
        }
        else if (rc == 0)
        {
            if (n == 1)
            {
                return (0);
            }
            else
            {
                break;
            }
        }
        else
        {
	    return (-1);
        }
    }
    *ptr = 0;

    return (n);
}

int write_n (int fd, char *ptr, int n_bytes)
{
    int n_left;
    int n_written;

    n_left = n_bytes;

    while (n_left > 0)
    {
        n_written = write (fd, ptr, n_left);
        if (n_written <= 0)
        {
	    return (n_written);
        }
        n_left = n_left - n_written;
        ptr = ptr + n_written;
    }

    return (n_bytes - n_left);
}

int read_n (int fd, char *ptr, int n_bytes)
{
    int n_left;
    int n_read;

    n_left = n_bytes;

    while (n_left > 0)
    {
        n_read = read (fd, ptr, n_left);
        if (n_read < 0)
        {
	    return (n_read);
        }
        else if (n_read == 0)
        {
	    break;
        }
        n_left = n_left - n_read;
        ptr = ptr + n_read;
    }

    return (n_bytes - n_left);
}