argp-parse.c

贝叶斯学习算法分类文本。基于朴素贝叶斯分类器的文本分类的通用算法

/* Hierarchial argument parsing, layered over getopt
   Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Written by Miles Bader <[e-mail]>.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include <getopt.h>

#ifndef _
/* This is for other GNU distributions with internationalized messages.
   When compiling libc, the _ macro is predefined.  */
#ifdef HAVE_LIBINTL_H
# include <libintl.h>
# define _(msgid)       gettext (msgid)
#else
# define _(msgid)       (msgid)
# define gettext(msgid) (msgid)
#endif
#endif

#if _LIBC - 0
#include <libc-lock.h>
#else
#ifdef HAVE_CTHREADS_H
#include <cthreads.h>
#endif
#endif /* _LIBC */

#include "argp.h"
#include "argp-namefrob.h"

/* Getopt return values.  */
#define KEY_END (-1)		/* The end of the options.  */
#define KEY_ARG 1		/* A non-option argument.  */
#define KEY_ERR '?'		/* An error parsing the options.  */

/* The meta-argument used to prevent any further arguments being interpreted
   as options.  */
#define QUOTE "--"

/* The number of bits we steal in a long-option value for our own use.  */
#define GROUP_BITS CHAR_BIT

/* The number of bits available for the user value.  */
#define USER_BITS ((sizeof ((struct option *)0)->val * CHAR_BIT) - GROUP_BITS)
#define USER_MASK ((1 << USER_BITS) - 1)

/* EZ alias for ARGP_ERR_UNKNOWN.  */
#define EBADKEY ARGP_ERR_UNKNOWN

/* Default options.  */

/* When argp is given the --HANG switch, _ARGP_HANG is set and argp will sleep
   for one second intervals, decrementing _ARGP_HANG until it's zero.  Thus
   you can force the program to continue by attaching a debugger and setting
   it to 0 yourself.  */
volatile int _argp_hang = 0;

#define OPT_PROGNAME	-2
#define OPT_USAGE	-3
#define OPT_HANG	-4

static const struct argp_option argp_default_options[] =
{
  {"help",	  '?',    	0, 0,  "Give this help list", -1},
  {"usage",	  OPT_USAGE,	0, 0,  "Give a short usage message"},
  {"program-name",OPT_PROGNAME,"NAME", OPTION_HIDDEN, "Set the program name"},
  {"HANG",	  OPT_HANG,    "SECS", OPTION_ARG_OPTIONAL | OPTION_HIDDEN,
     "Hang for SECS seconds (default 3600)"},
  {0, 0}
};

static error_t
argp_default_parser (int key, char *arg, struct argp_state *state)
{
  switch (key)
    {
    case '?':
      __argp_state_help (state, state->out_stream, ARGP_HELP_STD_HELP);
      break;
    case OPT_USAGE:
      __argp_state_help (state, state->out_stream,
		       ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
      break;

    case OPT_PROGNAME:		/* Set the program name.  */
      program_invocation_name = arg;

      /* [Note that some systems only have PROGRAM_INVOCATION_SHORT_NAME (aka
	 __PROGNAME), in which case, PROGRAM_INVOCATION_NAME is just defined
	 to be that, so we have to be a bit careful here.]  */
      arg = strrchr (arg, '/');
      if (arg)
	program_invocation_short_name = arg + 1;
      else
	program_invocation_short_name = program_invocation_name;

      /* Update what we use for messages.  */
      state->name = program_invocation_short_name;

      if ((state->flags & (ARGP_PARSE_ARGV0 | ARGP_NO_ERRS))
	  == ARGP_PARSE_ARGV0)
	/* Update what getopt uses too.  */
	state->argv[0] = program_invocation_name;

      break;

    case OPT_HANG:
      _argp_hang = atoi (arg ? arg : "3600");
      while (_argp_hang-- > 0)
	__sleep (1);
      break;

    default:
      return EBADKEY;
    }
  return 0;
}

static const struct argp argp_default_argp =
  {argp_default_options, &argp_default_parser};


static const struct argp_option argp_version_options[] =
{
  {"version",	  'V',    	0, 0,  "Print program version", -1},
  {0, 0}
};

static error_t
argp_version_parser (int key, char *arg, struct argp_state *state)
{
  switch (key)
    {
    case 'V':
      if (argp_program_version_hook)
	(*argp_program_version_hook) (state->out_stream, state);
      else if (argp_program_version)
	fprintf (state->out_stream, "%s\n", argp_program_version);
      else
	__argp_error (state, _("No version known!?"));
      if (! (state->flags & ARGP_NO_EXIT))
	exit (0);
      break;
    default:
      return EBADKEY;
    }
  return 0;
}

static const struct argp argp_version_argp =
  {argp_version_options, &argp_version_parser};

/* Returns the offset into the getopt long options array LONG_OPTIONS of a
   long option with called NAME, or -1 if none is found.  Passing NULL as
   NAME will return the number of options.  */
static int
find_long_option (struct option *long_options, const char *name)
{
  struct option *l = long_options;
  while (l->name != NULL)
    if (name != NULL && strcmp (l->name, name) == 0)
      return l - long_options;
    else
      l++;
  if (name == NULL)
    return l - long_options;
  else
    return -1;
}

/* If we can, we regulate access to getopt, which is non-reentrant, with a
   mutex.  Since the case we're trying to guard against is two different
   threads interfering, and it's possible that someone might want to call
   argp_parse recursively (they're careful), we use a recursive lock if
   possible.  */

#if _LIBC - 0

__libc_lock_define_initialized_recursive (static, getopt_lock)
#define LOCK_GETOPT   __libc_lock_lock_recursive (getopt_lock)
#define UNLOCK_GETOPT __libc_lock_unlock_recursive (getopt_lock)

#else /* !_LIBC */
#ifdef HAVE_CTHREADS_H

static struct mutex getopt_lock = MUTEX_INITIALIZER;
#define LOCK_GETOPT   mutex_lock (&getopt_lock)
#define UNLOCK_GETOPT mutex_unlock (&getopt_lock)

#else /* !HAVE_CTHREADS_H */

#define LOCK_GETOPT    (void)0
#define UNLOCK_GETOPT  (void)0

#endif /* HAVE_CTHREADS_H */
#endif /* _LIBC */

/* This hack to allow programs that know what's going on to call argp
   recursively.  If someday argp is changed not to use the non-reentrant
   getopt interface, we can get rid of this shit.  XXX */
void
_argp_unlock_xxx (void)
{
  UNLOCK_GETOPT;
}

/* The state of a `group' during parsing.  Each group corresponds to a
   particular argp structure from the tree of such descending from the top
   level argp passed to argp_parse.  */
struct group
{
  /* This group's parsing function.  */
  argp_parser_t parser;

  /* Which argp this group is from.  */
  const struct argp *argp;

  /* Points to the point in SHORT_OPTS corresponding to the end of the short
     options for this group.  We use it to determine from which group a
     particular short options is from.  */
  char *short_end;

  /* The number of non-option args sucessfully handled by this parser.  */
  unsigned args_processed;

  /* This group's parser's parent's group.  */
  struct group *parent;
  unsigned parent_index;	/* And the our position in the parent.   */

  /* These fields are swapped into and out of the state structure when
     calling this group's parser.  */
  void *input, **child_inputs;
  void *hook;
};

/* Call GROUP's parser with KEY and ARG, swapping any group-specific info
   from STATE before calling, and back into state afterwards.  If GROUP has
   no parser, EBADKEY is returned.  */
static error_t
group_parse (struct group *group, struct argp_state *state, int key, char *arg)
{
  if (group->parser)
    {
      error_t err;
      state->hook = group->hook;
      state->input = group->input;
      state->child_inputs = group->child_inputs;
      state->arg_num = group->args_processed;
      err = (*group->parser)(key, arg, state);
      group->hook = state->hook;
      return err;
    }
  else
    return EBADKEY;
}

struct parser
{
  const struct argp *argp;

  /* SHORT_OPTS is the getopt short options string for the union of all the
     groups of options.  */
  char *short_opts;
  /* LONG_OPTS is the array of getop long option structures for the union of
     all the groups of options.  */
  struct option *long_opts;

  /* States of the various parsing groups.  */
  struct group *groups;
  /* The end of the GROUPS array.  */
  struct group *egroup;
  /* An vector containing storage for the CHILD_INPUTS field in all groups.  */
  void **child_inputs;

  /* True if we think using getopt is still useful; if false, then
     remaining arguments are just passed verbatim with ARGP_KEY_ARG.  This is
     cleared whenever getopt returns KEY_END, but may be set again if the user
     moves the next argument pointer backwards.  */
  int try_getopt;

  /* State block supplied to parsing routines.  */
  struct argp_state state;

  /* Memory used by this parser.  */
  void *storage;
};

/* The next usable entries in the various parser tables being filled in by
   convert_options.  */
struct parser_convert_state
{
  struct parser *parser;
  char *short_end;
  struct option *long_end;
  void **child_inputs_end;
};

/* Converts all options in ARGP (which is put in GROUP) and ancestors
   into getopt options stored in SHORT_OPTS and LONG_OPTS; SHORT_END and
   CVT->LONG_END are the points at which new options are added.  Returns the
   next unused group entry.  CVT holds state used during the conversion.  */
static struct group *
convert_options (const struct argp *argp,
		 struct group *parent, unsigned parent_index,
		 struct group *group, struct parser_convert_state *cvt)
{
  /* REAL is the most recent non-alias value of OPT.  */
  const struct argp_option *real = argp->options;
  const struct argp_child *children = argp->children;

  if (real || argp->parser)
    {
      const struct argp_option *opt;

      if (real)
	for (opt = real; !__option_is_end (opt); opt++)
	  {
	    if (! (opt->flags & OPTION_ALIAS))
	      /* OPT isn't an alias, so we can use values from it.  */
	      real = opt;

	    if (! (real->flags & OPTION_DOC))
	      /* A real option (not just documentation).  */
	      {
		if (__option_is_short (opt))
		  /* OPT can be used as a short option.  */
		  {
		    *cvt->short_end++ = opt->key;
		    if (real->arg)
		      {
			*cvt->short_end++ = ':';
			if (real->flags & OPTION_ARG_OPTIONAL)
			  *cvt->short_end++ = ':';
		      }
		    *cvt->short_end = '\0'; /* keep 0 terminated */
		  }

		if (opt->name
		    && find_long_option (cvt->parser->long_opts, opt->name) < 0)
		  /* OPT can be used as a long option.  */
		  {
		    cvt->long_end->name = opt->name;
		    cvt->long_end->has_arg =
		      (real->arg
		       ? (real->flags & OPTION_ARG_OPTIONAL
			  ? optional_argument
			  : required_argument)
		       : no_argument);
		    cvt->long_end->flag = 0;
		    /* we add a disambiguating code to all the user's
		       values (which is removed before we actually call
		       the function to parse the value); this means that
		       the user loses use of the high 8 bits in all his
		       values (the sign of the lower bits is preserved
		       however)...  */
		    cvt->long_end->val =
		      ((opt->key | real->key) & USER_MASK)
		      + (((group - cvt->parser->groups) + 1) << USER_BITS);

		    /* Keep the LONG_OPTS list terminated.  */
		    (++cvt->long_end)->name = NULL;
		  }
	      }
	    }

      group->parser = argp->parser;
      group->argp = argp;
      group->short_end = cvt->short_end;
      group->args_processed = 0;
      group->parent = parent;
      group->parent_index = parent_index;
      group->input = 0;
      group->hook = 0;
      group->child_inputs = 0;

      if (children)
	/* Assign GROUP's CHILD_INPUTS field some space from
           CVT->child_inputs_end.*/
	{
	  unsigned num_children = 0;
	  while (children[num_children].argp)
	    num_children++;
	  group->child_inputs = cvt->child_inputs_end;
	  cvt->child_inputs_end += num_children;
	}

      parent = group++;
    }
  else
    parent = 0;

  if (children)
    {
      unsigned index = 0;
      while (children->argp)
	group =
	  convert_options (children++->argp, parent, index++, group, cvt);
    }

  return group;
}

/* Find the merged set of getopt options, with keys appropiately prefixed. */
static void
parser_convert (struct parser *parser, const struct argp *argp, int flags)
{
  struct parser_convert_state cvt;

  cvt.parser = parser;
  cvt.short_end = parser->short_opts;
  cvt.long_end = parser->long_opts;
  cvt.child_inputs_end = parser->child_inputs;

  if (flags & ARGP_IN_ORDER)
    *cvt.short_end++ = '-';
  else if (flags & ARGP_NO_ARGS)
    *cvt.short_end++ = '+';
  *cvt.short_end = '\0';

  cvt.long_end->name = NULL;

  parser->argp = argp;

  if (argp)
    parser->egroup = convert_options (argp, 0, 0, parser->groups, &cvt);
  else
    parser->egroup = parser->groups; /* No parsers at all! */