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argp_parse
The default behavior of argp_parse
is designed to be convenient
for the most common case of parsing program command line argument. To
modify these defaults, the following flags may be or'd together in the
flags argument to argp_parse
:
ARGP_PARSE_ARGV0
argp_parse
. Unless ARGP_NO_ERRS
is set, the first element
of the argument vector is skipped for option parsing purposes, as it
corresponds to the program name in a command line.
ARGP_NO_ERRS
stderr
; unless
this flag is set, ARGP_PARSE_ARGV0
is ignored, as argv[0]
is used as the program name in the error messages. This flag implies
ARGP_NO_EXIT
. This is based on the assumption that silent exiting
upon errors is bad behavior.
ARGP_NO_ARGS
ARGP_KEY_ARG
, the actual
argument being the value. This flag needn't normally be set, as the
default behavior is to stop parsing as soon as an argument fails to be
parsed. See Argp Parser Functions.
ARGP_IN_ORDER
ARGP_NO_HELP
--help
, which ordinarily
causes usage and option help information to be output to stdout
and exit (0)
.
ARGP_NO_EXIT
ARGP_LONG_ONLY
-
(i.e. -help
). This results in a less useful interface, and its
use is discouraged as it conflicts with the way most GNU programs work
as well as the GNU coding standards.
ARGP_SILENT
ARGP_NO_EXIT
, ARGP_NO_ERRS
, and ARGP_NO_HELP
.