localeinfo.h

用于嵌入式Linux系统的标准C的库函数

/* Declarations for internal libc locale interfaces
   Copyright (C) 1995, 96, 97, 98, 99,2000,2001 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 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
   Lesser General Public License for more details.

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

#ifndef _LOCALEINFO_H
#define _LOCALEINFO_H 1

#include <stddef.h>
#include <langinfo.h>
#include <limits.h>
#include <time.h>
#include <stdint.h>
#include <sys/types.h>

/* This has to be changed whenever a new locale is defined.  */
#define __LC_LAST	13

#include "loadinfo.h"	/* For loaded_l10nfile definition.  */

/* Magic number at the beginning of a locale data file for CATEGORY.  */
#define	LIMAGIC(category)	((unsigned int) (0x20000828 ^ (category)))

/* Two special weight constants for the collation data.  */
#define IGNORE_CHAR	2

/* We use a special value for the usage counter in `locale_data' to
   signal that this data must never be removed anymore.  */
#define MAX_USAGE_COUNT (UINT_MAX - 1)
#define UNDELETABLE	UINT_MAX

/* Structure describing locale data in core for a category.  */
struct locale_data
{
  const char *name;
  const char *filedata;		/* Region mapping the file data.  */
  off_t filesize;		/* Size of the file (and the region).  */
  int mmaped;			/* If nonzero the data is mmaped.  */

  unsigned int usage_count;	/* Counter for users.  */

  int use_translit;		/* Nonzero if the mb*towv*() and wc*tomb()
				   functions should use transliteration.  */
  const char *options;		/* Extra options from the locale name,
				   not used in the path to the locale data.  */

  unsigned int nstrings;	/* Number of strings below.  */
  union locale_data_value
  {
    const uint32_t *wstr;
    const char *string;
    unsigned int word;
  }
  values __flexarr;	/* Items, usually pointers into `filedata'.  */
};

/* We know three kinds of collation sorting rules.  */
enum coll_sort_rule
{
  illegal_0__,
  sort_forward,
  sort_backward,
  illegal_3__,
  sort_position,
  sort_forward_position,
  sort_backward_position,
  sort_mask
};

/* We can map the types of the entries into a few categories.  */
enum value_type
{
  none,
  string,
  stringarray,
  byte,
  bytearray,
  word,
  stringlist,
  wordarray,
  wstring,
  wstringarray,
  wstringlist
};


/* Definitions for `era' information from LC_TIME.  */
#define ERA_NAME_FORMAT_MEMBERS 4
#define ERA_M_NAME   0
#define ERA_M_FORMAT 1
#define ERA_W_NAME   2
#define ERA_W_FORMAT 3


/* Structure to access `era' information from LC_TIME.  */
struct era_entry
{
  uint32_t direction;		/* Contains '+' or '-'.  */
  int32_t offset;
  int32_t start_date[3];
  int32_t stop_date[3];
  const char *era_name;
  const char *era_format;
  const wchar_t *era_wname;
  const wchar_t *era_wformat;
  int absolute_direction;
  /* absolute direction:
     +1 indicates that year number is higher in the future. (like A.D.)
     -1 indicates that year number is higher in the past. (like B.C.)  */
};


/* LC_CTYPE specific:
   Hardwired indices for standard wide character translation mappings.  */
enum
{
  __TOW_toupper = 0,
  __TOW_tolower = 1
};


/* LC_CTYPE specific:
   Access a wide character class with a single character index.
   _ISCTYPE (c, desc) = iswctype (btowc (c), desc).
   c must be an `unsigned char'.  desc must be a nonzero wctype_t.  */
#define _ISCTYPE(c, desc) \
  (((((const uint32_t *) (desc)) - 8)[(c) >> 5] >> ((c) & 0x1f)) & 1)


/* For each category declare the variable for the current locale data.  */
#define DEFINE_CATEGORY(category, category_name, items, a) \
extern struct locale_data *_nl_current_##category;
#include "categories.def"
#undef	DEFINE_CATEGORY

extern const char *const _nl_category_names[__LC_LAST];
extern const size_t _nl_category_name_sizes[__LC_LAST];
extern struct locale_data * *const _nl_current[__LC_LAST];

/* Extract the current CATEGORY locale's string for ITEM.  */
#define _NL_CURRENT(category, item) \
  (_nl_current_##category->values[_NL_ITEM_INDEX (item)].string)

/* Extract the current CATEGORY locale's string for ITEM.  */
#define _NL_CURRENT_WSTR(category, item) \
  ((wchar_t *) (_nl_current_##category->values[_NL_ITEM_INDEX (item)].wstr))

/* Extract the current CATEGORY locale's word for ITEM.  */
#define _NL_CURRENT_WORD(category, item) \
  (_nl_current_##category->values[_NL_ITEM_INDEX (item)].word)

/* This is used in lc-CATEGORY.c to define _nl_current_CATEGORY.  */
#define _NL_CURRENT_DEFINE(category) \
  extern struct locale_data _nl_C_##category; \
  struct locale_data *_nl_current_##category = &_nl_C_##category

/* Load the locale data for CATEGORY from the file specified by *NAME.
   If *NAME is "", use environment variables as specified by POSIX,
   and fill in *NAME with the actual name used.  The directories
   listed in LOCALE_PATH are searched for the locale files.  */
extern struct locale_data *_nl_find_locale (const char *locale_path,
					    size_t locale_path_len,
					    int category, const char **name);

/* Try to load the file described by FILE.  */
extern void _nl_load_locale (struct loaded_l10nfile *file, int category);

/* Free all resource.  */
extern void _nl_unload_locale (struct locale_data *locale);

/* Free the locale and give back all memory if the usage count is one.  */
extern void _nl_remove_locale (int locale, struct locale_data *data);


/* Return `era' entry which corresponds to TP.  Used in strftime.  */
extern struct era_entry *_nl_get_era_entry (const struct tm *tp);

/* Return `era' cnt'th entry .  Used in strptime.  */
extern struct era_entry *_nl_select_era_entry (int cnt);

/* Return `alt_digit' which corresponds to NUMBER.  Used in strftime.  */
extern const char *_nl_get_alt_digit (unsigned int number);

/* Similar, but now for wide characters.  */
extern const wchar_t *_nl_get_walt_digit (unsigned int number);

/* Parse string as alternative digit and return numeric value.  */
extern int _nl_parse_alt_digit (const char **strp);

/* Postload processing.  */
extern void _nl_postload_ctype (void);
extern void _nl_postload_time (void);


#endif	/* localeinfo.h */