zargs(3)

zargs(3)

CZMQ Manual - CZMQ/4.1.1

Name

zargs - Class for Platform independent command line argument parsing helpers

Synopsis

//  This is a draft class, and may change without notice. It is disabled in
//  stable builds by default. If you use this in applications, please ask
//  for it to be pushed to stable state. Use --enable-drafts to enable.
#ifdef CZMQ_BUILD_DRAFT_API
//  *** Draft method, for development use, may change without warning ***
//  Create a new zargs from command line arguments.
CZMQ_EXPORT zargs_t *
    zargs_new (int argc, char **argv);

//  *** Draft method, for development use, may change without warning ***
//  Destroy zargs instance.
CZMQ_EXPORT void
    zargs_destroy (zargs_t **self_p);

//  *** Draft method, for development use, may change without warning ***
//  Return program name (argv[0])
CZMQ_EXPORT const char *
    zargs_progname (zargs_t *self);

//  *** Draft method, for development use, may change without warning ***
//  Return number of positional arguments
CZMQ_EXPORT size_t
    zargs_arguments (zargs_t *self);

//  *** Draft method, for development use, may change without warning ***
//  Return first positional argument or NULL
CZMQ_EXPORT const char *
    zargs_first (zargs_t *self);

//  *** Draft method, for development use, may change without warning ***
//  Return next positional argument or NULL
CZMQ_EXPORT const char *
    zargs_next (zargs_t *self);

//  *** Draft method, for development use, may change without warning ***
//  Return first named parameter value, or NULL if there are no named
//  parameters, or value for which zargs_param_empty (arg) returns true.
CZMQ_EXPORT const char *
    zargs_param_first (zargs_t *self);

//  *** Draft method, for development use, may change without warning ***
//  Return next named parameter value, or NULL if there are no named
//  parameters, or value for which zargs_param_empty (arg) returns true.
CZMQ_EXPORT const char *
    zargs_param_next (zargs_t *self);

//  *** Draft method, for development use, may change without warning ***
//  Return current parameter name, or NULL if there are no named
//  parameters.
CZMQ_EXPORT const char *
    zargs_param_name (zargs_t *self);

//  *** Draft method, for development use, may change without warning ***
//  Return value of named parameter, NULL if no given parameter has
//  been specified, or special value for wich zargs_param_empty ()
//  returns true.
CZMQ_EXPORT const char *
    zargs_param_lookup (zargs_t *self, const char *keys);

//  *** Draft method, for development use, may change without warning ***
//  Return value of named parameter(s), NULL if no given parameter has
//  been specified, or special value for wich zargs_param_empty ()
//  returns true.
CZMQ_EXPORT const char *
    zargs_param_lookupx (zargs_t *self, const char *keys, ...);

//  *** Draft method, for development use, may change without warning ***
//  Returns true if there are --help -h arguments
CZMQ_EXPORT bool
    zargs_has_help (zargs_t *self);

//  *** Draft method, for development use, may change without warning ***
//  Returns true if parameter did not have a value
CZMQ_EXPORT bool
    zargs_param_empty (const char *arg);

//  *** Draft method, for development use, may change without warning ***
//  Print an instance of zargs.
CZMQ_EXPORT void
    zargs_print (zargs_t *self);

//  *** Draft method, for development use, may change without warning ***
//  Self test of this class.
CZMQ_EXPORT void
    zargs_test (bool verbose);

#endif // CZMQ_BUILD_DRAFT_API
Please add '@interface' section in './../src/zargs.c'.

Description

zargs - Platform independent command line argument parsing helpers

Platform independent command line argument parsing helpers

There are two kind of elements provided by this class foo —named-parameter —parameter with_value positional arguments -a gain-parameter zargs keeps poision only for arguments, parameters are to be accessed like hash.

It DOES: * provide easy to use CLASS compatible API for accessing argv * is platform independent * provide getopt_long style — argument, which delimits parameters from arguments * makes parameters positon independent

It does NOT * change argv * provide a "declarative" way to define command line interface

In future it SHALL * hide several formats of command line to one (-Idir, —include=dir, —include dir are the same from API pov)

Please add @discuss section in ./../src/zargs.c.

Example

From zargs_test method

// Simple create/destroy test

char *argv1[] = {"progname", "--named1", "-n1", "val1", "positional1", "--with", "value", "--with2=value2", "-W3value3", "--", "--thisis", "considered", "positional", NULL};

zargs_t *self = zargs_new (13, argv1);
assert (self);

assert (streq (zargs_progname (self), "progname"));
assert (streq (zargs_first (self), "positional1"));
assert (streq (zargs_next (self), "--thisis"));
assert (streq (zargs_next (self), "considered"));
assert (streq (zargs_next (self), "positional"));
assert (!zargs_next (self));

assert (zargs_param_empty (zargs_param_lookup (self, "--named1")));
assert (!zargs_param_empty (zargs_param_lookup (self, "-n1")));
assert (streq (zargs_param_lookupx (self, "--not at all", "-n1", NULL), "val1"));
// TODO: this does not look like an easy hack w/o allocating extra memory
// ???
//assert (streq (zargs_param_lookup (self, "--with", NULL), "value2"));
 zargs_destroy (&self);

Authors

The czmq manual was written by the authors in the AUTHORS file.

Resources

Main web site:

Report bugs to the email <gro.qmorez.stsil|ved-qmorez#gro.qmorez.stsil|ved-qmorez>

Copyright

Copyright (c) the Contributors as noted in the AUTHORS file. This file is part of CZMQ, the high-level C binding for ØMQ: http://czmq.zeromq.org. This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/. LICENSE included with the czmq distribution.