bson_strndup()
Synopsis
char *
bson_strndup (const char *str,
              size_t      n_bytes);Parameters
str  | 
A string to copy.  | 
n_bytes  | 
A size_t.  | 
Description
Allocates a new string and copies up to n_bytes from str into it. A trailing \0 is always set.
Returns
A newly allocated string that should be freed with bson_free().