| 1 | /* Argp example #2 -- a pretty minimal program using argp |
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| 2 | Copyright (C) 1991-2022 Free Software Foundation, Inc. |
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| 3 | |
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| 4 | This program is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU General Public License |
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| 6 | as published by the Free Software Foundation; either version 2 |
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| 7 | of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | This program is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 12 | GNU General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU General Public License |
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| 15 | along with this program; if not, see <https://www.gnu.org/licenses/>. |
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| 16 | */ |
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| 17 | |
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| 18 | /* This program doesn't use any options or arguments, but uses |
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| 19 | argp to be compliant with the GNU standard command line |
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| 20 | format. |
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| 21 | |
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| 22 | In addition to making sure no arguments are given, and |
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| 23 | implementing a --help option, this example will have a |
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| 24 | --version option, and will put the given documentation string |
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| 25 | and bug address in the --help output, as per GNU standards. |
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| 26 | |
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| 27 | The variable ARGP contains the argument parser specification; |
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| 28 | adding fields to this structure is the way most parameters are |
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| 29 | passed to argp_parse (the first three fields are usually used, |
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| 30 | but not in this small program). There are also two global |
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| 31 | variables that argp knows about defined here, |
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| 32 | ARGP_PROGRAM_VERSION and ARGP_PROGRAM_BUG_ADDRESS (they are |
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| 33 | global variables because they will almost always be constant |
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| 34 | for a given program, even if it uses different argument |
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| 35 | parsers for various tasks). */ |
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| 36 | |
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| 37 | #include <stdlib.h> |
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| 38 | #include <argp.h> |
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| 39 | |
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| 40 | const char *argp_program_version = |
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| 41 | "argp-ex2 1.0" ; |
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| 42 | const char *argp_program_bug_address = |
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| 43 | "<bug-gnu-utils@@gnu.org>" ; |
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| 44 | |
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| 45 | /* Program documentation. */ |
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| 46 | static char doc[] = |
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| 47 | "Argp example #2 -- a pretty minimal program using argp" ; |
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| 48 | |
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| 49 | /* Our argument parser. The @code{options}, @code{parser}, and |
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| 50 | @code{args_doc} fields are zero because we have neither options or |
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| 51 | arguments; @code{doc} and @code{argp_program_bug_address} will be |
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| 52 | used in the output for @samp{--help}, and the @samp{--version} |
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| 53 | option will print out @code{argp_program_version}. */ |
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| 54 | static struct argp argp = { 0, 0, 0, doc }; |
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| 55 | |
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| 56 | int |
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| 57 | main (int argc, char **argv) |
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| 58 | { |
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| 59 | argp_parse (argp: &argp, argc: argc, argv: argv, flags: 0, arg_index: 0, input: 0); |
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| 60 | exit (0); |
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| 61 | } |
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| 62 | |
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