mandatory and optional options with argc and argv

Asked Dec 22 '22 at 19:46

Active Dec 22 '22 at 20:28

Viewed 57 times

I want to create a programme that will have mandatory option and optional option.

Mandatory:

-d <device>

Optional:

-h : help
-m <value> : launch an internal function with the value of the argument.
... (other optional option with or without argument).

I see how manage only optional option but how to cohabitate the mandatory and optional?

Other info: the mandatory option will give the information on what /dev/video# to open and needs to be done before parsing the optional options where functions will be called that need to have the file descriptor already opened.

I tried to manage it with getopt() but I did not see how to manage both mandatory and optional options.

edited Dec 22 '22 at 20:28

Jonathan Leffler

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asked Dec 22 '22 at 19:46

eone

2

In your program logic, if you are not finding a "mandatory" option in the list of the options provided - generate an error. – Eugene Sh. Dec 22 '22 at 19:50
This has already been answered here: https://stackoverflow.com/questions/26976495/mandatory-parameter-getopt-in-c – codyne Dec 22 '22 at 19:50
3

Read all of the option values first, then process them. – dbush Dec 22 '22 at 19:50
1

eone, "I tried to manage it with getopt()" ==>post your try here. – chux - Reinstate Monica Dec 22 '22 at 20:40

mandatory and optional options with argc and argv

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