locale.c

标准c库代码,可以应用于各个系统提供了大量的基本函数

/*
FUNCTION
<<setlocale>>, <<localeconv>>---select or query locale

INDEX
	setlocale
INDEX
	localeconv
INDEX
	_setlocale_r
INDEX
	_localeconv_r

ANSI_SYNOPSIS
	#include <locale.h>
	char *setlocale(int <[category]>, const char *<[locale]>);
	lconv *localeconv(void);

	char *_setlocale_r(void *<[reent]>,
                        int <[category]>, const char *<[locale]>);
	lconv *_localeconv_r(void *<[reent]>);

TRAD_SYNOPSIS
	#include <locale.h>
	char *setlocale(<[category]>, <[locale]>)
	int <[category]>;
	char *<[locale]>;

	lconv *localeconv();

	char *_setlocale_r(<[reent]>, <[category]>, <[locale]>)
	char *<[reent]>;
	int <[category]>;
	char *<[locale]>;

	lconv *_localeconv_r(<[reent]>);
	char *<[reent]>;

DESCRIPTION
<<setlocale>> is the facility defined by ANSI C to condition the
execution environment for international collating and formatting
information; <<localeconv>> reports on the settings of the current
locale.

This is a minimal implementation, supporting only the required <<``C''>>
value for <[locale]>; strings representing other locales are not
honored.  (<<``''>> is also accepted; it represents the default locale
for an implementation, here equivalent to <<``C''>>.)

If you use <<NULL>> as the <[locale]> argument, <<setlocale>> returns
a pointer to the string representing the current locale (always
<<``C''>> in this implementation).  The acceptable values for
<[category]> are defined in `<<locale.h>>' as macros beginning with
<<"LC_">>, but this implementation does not check the values you pass
in the <[category]> argument.

<<localeconv>> returns a pointer to a structure (also defined in
`<<locale.h>>') describing the locale-specific conventions currently
in effect.  

<<_localeconv_r>> and <<_setlocale_r>> are reentrant versions of
<<localeconv>> and <<setlocale>> respectively.  The extra argument
<[reent]> is a pointer to a reentrancy structure.

RETURNS
<<setlocale>> returns either a pointer to a string naming the locale
currently in effect (always <<``C''>> for this implementation), or, if
the locale request cannot be honored, <<NULL>>.

<<localeconv>> returns a pointer to a structure of type <<lconv>>,
which describes the formatting and collating conventions in effect (in
this implementation, always those of the C locale).

PORTABILITY
ANSI C requires <<setlocale>>, but the only locale required across all
implementations is the C locale.

No supporting OS subroutines are required.
*/

/*
 * setlocale, localeconv : internationalize your locale.
 *                         (Only "C" or null supported).
 */

#include <locale.h>
#include <string.h>
#include <limits.h>
#include <reent.h>

static _CONST struct lconv lconv = 
{
  ".", "", "", "", "", "", "", "", "", "",
  CHAR_MAX, CHAR_MAX, CHAR_MAX, CHAR_MAX,
  CHAR_MAX, CHAR_MAX, CHAR_MAX, CHAR_MAX,
};


char *
_DEFUN(_setlocale_r, (p, category, locale),
       struct _reent *p _AND
       int category _AND
       _CONST char *locale)
{
  if (locale && strcmp (locale, "C") && strcmp (locale, ""))
   return 0;

  p->_current_category = category;
  
  p->_current_locale = locale;
  
  return "C";
}


struct lconv *
_DEFUN(_localeconv_r, (data), 
      struct _reent *data)
{
  return (struct lconv *) &lconv;
}

#ifndef _REENT_ONLY

char *
_DEFUN(setlocale, (category, locale),
       int category _AND
       _CONST char *locale)
{
  return _setlocale_r (_REENT, category, locale);
}


struct lconv *
_DEFUN_VOID(localeconv)
{
  return _localeconv_r (_REENT);
}

#endif