null pointer assignment to argv

[kkirby]

When you assign this->output to argv, and then later on assign a null value to this->output[x], it also updates argv to have a null pointer. This is unexpected and argv shouldn't be modified.

[cofyc]

Hi,

At beginning, I wrote this library to simplify arguments parsing as possible as I can. Modifying original argv may have side effects (see issue #3).

It's hard to change the design now. To work around it, you can make a copy at first, then pass the copy of argv to argparse_parse.