//
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// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
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// Copyright 2018 Capitar IT Group BV <info@capitar.com>
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//
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// This software is supplied under the terms of the MIT License, a
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// copy of which should be located in the distribution where this
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// file was obtained (LICENSE.txt). A copy of the license may also be
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// found online at https://opensource.org/licenses/MIT.
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//
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#ifndef NNG_SUPPLEMENTAL_UTIL_OPTIONS_H
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#define NNG_SUPPLEMENTAL_UTIL_OPTIONS_H
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#include <stdbool.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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// This is a relatively simple "options parsing" library, used to
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// parse command line options. We would use getopt(3), but there are
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// two problems with getopt(3). First, it isn't available on all
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// platforms (especially Win32), and second, it doesn't support long
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// options. We *exclusively* support long options. POSIX style
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// short option clustering is *NOT* supported.
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struct nng_optspec {
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const char *o_name; // Long style name (may be NULL for short only)
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int o_short; // Short option (no clustering!)
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int o_val; // Value stored on a good parse (>0)
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bool o_arg; // Option takes an argument if true
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};
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typedef struct nng_optspec nng_optspec;
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// Call with *optidx set to 1 to start parsing for a standard program.
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// The val will store the value of the matched "o_val", optarg will be
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// set to match the option string, and optidx will be increment appropriately.
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// Returns -1 when the end of options is reached, 0 on success, or
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// NNG_EINVAL if the option parse is invalid for any reason.
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NNG_DECL int nng_opts_parse(int argc, char *const *argv,
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const nng_optspec *opts, int *val, char **optarg, int *optidx);
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#ifdef __cplusplus
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}
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#endif
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#endif // NNG_SUPPLEMENTAL_UTIL_OPTIONS_H
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