C函数setlocale()返回NULL
本帖最后由 dt3tc 于 2018-8-25 14:57 编辑去头文件看只找到函数声明,找不到函数定义
gcc 6.4 .0
sabayon Linux
谢谢
#include <stdio.h>
#include <locale.h>
#include <wchar.h>
int main(){
// 使用指定的 locale
char* locname = setlocale(LC_ALL,"zh_CN.UTF-8");
if ( NULL == locname ) {
printf("setlocale() with %s failed.\n","zh_CN.UTF-8");
}
else
{
printf("setlocale() with %s succeed.\n","zh_CN.UTF-8");
}
return 0;
}
与该库函数直接关联的头文件
/* Copyright (C) 1991-2017 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, see
<http://www.gnu.org/licenses/>.*/
/*
* ISO C99 Standard: 7.11 Localization <locale.h>
*/
#ifndef _LOCALE_H
#define _LOCALE_H 1
#include <features.h>
#define __need_NULL
#include <stddef.h>
#include <bits/locale.h>
__BEGIN_DECLS
/* These are the possibilities for the first argument to setlocale.
The code assumes that the lowest LC_* symbol has the value zero.*/
#define LC_CTYPE __LC_CTYPE
#define LC_NUMERIC __LC_NUMERIC
#define LC_TIME __LC_TIME
#define LC_COLLATE __LC_COLLATE
#define LC_MONETARY __LC_MONETARY
#define LC_MESSAGES __LC_MESSAGES
#define LC_ALL __LC_ALL
#define LC_PAPER __LC_PAPER
#define LC_NAME __LC_NAME
#define LC_ADDRESS __LC_ADDRESS
#define LC_TELEPHONE __LC_TELEPHONE
#define LC_MEASUREMENT __LC_MEASUREMENT
#define LC_IDENTIFICATION __LC_IDENTIFICATION
/* Structure giving information about numeric and monetary notation.*/
struct lconv
{
/* Numeric (non-monetary) information.*/
char *decimal_point; /* Decimal point character.*/
char *thousands_sep; /* Thousands separator.*/
/* Each element is the number of digits in each group;
elements with higher indices are farther left.
An element with value CHAR_MAX means that no further grouping is done.
An element with value 0 means that the previous element is used
for all groups farther left.*/
char *grouping;
/* Monetary information.*/
/* First three chars are a currency symbol from ISO 4217.
Fourth char is the separator.Fifth char is '\0'.*/
char *int_curr_symbol;
char *currency_symbol; /* Local currency symbol.*/
char *mon_decimal_point; /* Decimal point character.*/
char *mon_thousands_sep; /* Thousands separator.*/
char *mon_grouping; /* Like `grouping' element (above).*/
char *positive_sign; /* Sign for positive values.*/
char *negative_sign; /* Sign for negative values.*/
char int_frac_digits; /* Int'l fractional digits.*/
char frac_digits; /* Local fractional digits.*/
/* 1 if currency_symbol precedes a positive value, 0 if succeeds.*/
char p_cs_precedes;
/* 1 iff a space separates currency_symbol from a positive value.*/
char p_sep_by_space;
/* 1 if currency_symbol precedes a negative value, 0 if succeeds.*/
char n_cs_precedes;
/* 1 iff a space separates currency_symbol from a negative value.*/
char n_sep_by_space;
/* Positive and negative sign positions:
0 Parentheses surround the quantity and currency_symbol.
1 The sign string precedes the quantity and currency_symbol.
2 The sign string follows the quantity and currency_symbol.
3 The sign string immediately precedes the currency_symbol.
4 The sign string immediately follows the currency_symbol.*/
char p_sign_posn;
char n_sign_posn;
#ifdef __USE_ISOC99
/* 1 if int_curr_symbol precedes a positive value, 0 if succeeds.*/
char int_p_cs_precedes;
/* 1 iff a space separates int_curr_symbol from a positive value.*/
char int_p_sep_by_space;
/* 1 if int_curr_symbol precedes a negative value, 0 if succeeds.*/
char int_n_cs_precedes;
/* 1 iff a space separates int_curr_symbol from a negative value.*/
char int_n_sep_by_space;
/* Positive and negative sign positions:
0 Parentheses surround the quantity and int_curr_symbol.
1 The sign string precedes the quantity and int_curr_symbol.
2 The sign string follows the quantity and int_curr_symbol.
3 The sign string immediately precedes the int_curr_symbol.
4 The sign string immediately follows the int_curr_symbol.*/
char int_p_sign_posn;
char int_n_sign_posn;
#else
char __int_p_cs_precedes;
char __int_p_sep_by_space;
char __int_n_cs_precedes;
char __int_n_sep_by_space;
char __int_p_sign_posn;
char __int_n_sign_posn;
#endif
};
/* Set and/or return the current locale.*/
extern char *setlocale (int __category, const char *__locale) __THROW;
/* Return the numeric/monetary information for the current locale.*/
extern struct lconv *localeconv (void) __THROW;
#ifdef __USE_XOPEN2K8
/* POSIX.1-2008 extends the locale interface with functions for
explicit creation and manipulation of 'locale_t' objects
representing locale contexts, and a set of parallel
locale-sensitive text processing functions that take a locale_t
argument.This enables applications to work with data from
multiple locales simultaneously and thread-safely.*/
# include <bits/types/locale_t.h>
/* Return a reference to a data structure representing a set of locale
datasets.Unlike for the CATEGORY parameter for `setlocale' the
CATEGORY_MASK parameter here uses a single bit for each category,
made by OR'ing together LC_*_MASK bits above.*/
extern locale_t newlocale (int __category_mask, const char *__locale,
locale_t __base) __THROW;
/* These are the bits that can be set in the CATEGORY_MASK argument to
`newlocale'.In the GNU implementation, LC_FOO_MASK has the value
of (1 << LC_FOO), but this is not a part of the interface that
callers can assume will be true.*/
# define LC_CTYPE_MASK (1 << __LC_CTYPE)
# define LC_NUMERIC_MASK (1 << __LC_NUMERIC)
# define LC_TIME_MASK (1 << __LC_TIME)
# define LC_COLLATE_MASK (1 << __LC_COLLATE)
# define LC_MONETARY_MASK (1 << __LC_MONETARY)
# define LC_MESSAGES_MASK (1 << __LC_MESSAGES)
# define LC_PAPER_MASK (1 << __LC_PAPER)
# define LC_NAME_MASK (1 << __LC_NAME)
# define LC_ADDRESS_MASK (1 << __LC_ADDRESS)
# define LC_TELEPHONE_MASK (1 << __LC_TELEPHONE)
# define LC_MEASUREMENT_MASK (1 << __LC_MEASUREMENT)
# define LC_IDENTIFICATION_MASK (1 << __LC_IDENTIFICATION)
# define LC_ALL_MASK (LC_CTYPE_MASK \
| LC_NUMERIC_MASK \
| LC_TIME_MASK \
| LC_COLLATE_MASK \
| LC_MONETARY_MASK \
| LC_MESSAGES_MASK \
| LC_PAPER_MASK \
| LC_NAME_MASK \
| LC_ADDRESS_MASK \
| LC_TELEPHONE_MASK \
| LC_MEASUREMENT_MASK \
| LC_IDENTIFICATION_MASK \
)
/* Return a duplicate of the set of locale in DATASET.All usage
counters are increased if necessary.*/
extern locale_t duplocale (locale_t __dataset) __THROW;
/* Free the data associated with a locale dataset previously returned
by a call to `setlocale_r'.*/
extern void freelocale (locale_t __dataset) __THROW;
/* Switch the current thread's locale to DATASET.
If DATASET is null, instead just return the current setting.
The special value LC_GLOBAL_LOCALE is the initial setting
for all threads and can also be installed any time, meaning
the thread uses the global settings controlled by `setlocale'.*/
extern locale_t uselocale (locale_t __dataset) __THROW;
/* This value can be passed to `uselocale' and may be returned by it.
Passing this value to any other function has undefined behavior.*/
# define LC_GLOBAL_LOCALE ((locale_t) -1L)
#endif
__END_DECLS
#endif /* locale.h*/
有些函数封装起来了,看不到的
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