73 lines
2.2 KiB
C
73 lines
2.2 KiB
C
/*
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* Code for setting up command line flags like `./u-boot --help`
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*
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* Copyright (c) 2011 The Chromium OS Authors.
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*
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* Licensed under the GPL-2 or later.
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*/
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#ifndef __SANDBOX_GETOPT_H
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#define __SANDBOX_GETOPT_H
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struct sandbox_state;
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/*
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* Internal structure for storing details about the flag.
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* Most people should not have to dig around in this as
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* it only gets parsed by the core sandbox code. End
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* consumer code should focus on the macros below and
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* the callback function.
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*/
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struct sandbox_cmdline_option {
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/* The long flag name: "help" for "--help" */
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const char *flag;
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/* The (optional) short flag name: "h" for "-h" */
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int flag_short;
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/* The help string shown to the user when processing --help */
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const char *help;
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/* Whether this flag takes an argument */
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int has_arg;
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/* Callback into the end consumer code with the option */
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int (*callback)(struct sandbox_state *state, const char *opt);
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};
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/*
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* Internal macro to expand the lower macros into the necessary
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* magic junk that makes this all work.
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*/
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#define _SANDBOX_CMDLINE_OPT(f, s, ha, h) \
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static struct sandbox_cmdline_option sandbox_cmdline_option_##f = { \
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.flag = #f, \
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.flag_short = s, \
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.help = h, \
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.has_arg = ha, \
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.callback = sandbox_cmdline_cb_##f, \
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}; \
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/* Ppointer to the struct in a special section for the linker script */ \
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static __attribute__((section(".u_boot_sandbox_getopt"), used)) \
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struct sandbox_cmdline_option \
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*sandbox_cmdline_option_##f##_ptr = \
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&sandbox_cmdline_option_##f
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/**
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* Macros for end code to declare new command line flags.
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*
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* @param f The long flag name e.g. help
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* @param ha Does the flag have an argument e.g. 0/1
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* @param h The help string displayed when showing --help
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*
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* This invocation:
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* SANDBOX_CMDLINE_OPT(foo, 0, "The foo arg");
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* Will create a new flag named "--foo" (no short option) that takes
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* no argument. If the user specifies "--foo", then the callback func
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* sandbox_cmdline_cb_foo() will automatically be called.
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*/
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#define SANDBOX_CMDLINE_OPT(f, ha, h) _SANDBOX_CMDLINE_OPT(f, 0, ha, h)
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/*
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* Same as above, but @s is used to specify a short flag e.g.
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* SANDBOX_CMDLINE_OPT(foo, 'f', 0, "The foo arg");
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*/
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#define SANDBOX_CMDLINE_OPT_SHORT(f, s, ha, h) _SANDBOX_CMDLINE_OPT(f, s, ha, h)
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#endif
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