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to the same values in VALLIST). */
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ptrdiff_t argmatch (char const *arg, char const *const *arglist,
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# define ARGMATCH(Arg, Arglist, Vallist) \
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argmatch (Arg, Arglist, (char const *) (Vallist), sizeof *(Vallist))
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/* xargmatch calls this function when it fails. This function should not
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return. By default, this is a function that calls ARGMATCH_DIE which
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typedef void (*argmatch_exit_fn) (void);
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extern argmatch_exit_fn argmatch_die;