write method

// brief: write a string to a file

// return 0 if success

// return -1 if failure

 

int write2file(const char *src)
{
    char *w_buf = (char *)src;
    size_t w_len = strlen(src);
    ssize_t written = 0;

    // The return value of 'write' is the number of bytes actually written.  This
    // may be SIZE, but can always be smaller, so call 'write' in a loop, iterating
    // until all the data is written
    while (w_len > 0) {

      if((written = write(fFd, w_buf, w_len)) < 0){
        printf("write error");
        return -1;
      }

      w_buf += written;
      w_len -= written;
    }
    return 0;
}