[c]: 语言环境设置 -- setlocale()

[c]:  语言环境设置 -- setlocale()

 

 

 

 

一、语言环境设置【 Linux - Fedora 】

 

 

　　1、【Linux -- 类redhat 】语言环境设置

 

　　　　1.1、查看语言环境【/etc/locale.conf】：/etc/locale.conf    

 

 

　　2、【Linux -- 类debian 】语言环境设置

 

　　　　2.1、查看语言环境【/etc/default/locale】：/etc/default/locale     

 

 

　　3、【gcc    版本信息】

[wit@fedora tmp]$ gcc -v

Using built-in specs.

COLLECT_GCC=gcc

COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/13/lto-wrapper

OFFLOAD_TARGET_NAMES=nvptx-none

OFFLOAD_TARGET_DEFAULT=1

Target: x86_64-redhat-linux

Configured with: ../configure 

--enable-bootstrap 

--enable-languages=c,c++,fortran,objc,obj-c++,ada,go,d,m2,lto 

--prefix=/usr 

--mandir=/usr/share/man 

--infodir=/usr/share/info 

--with-bugurl=http://bugzilla.redhat.com/bugzilla 

--enable-shared 

--enable-threads=posix 

--enable-checking=release 

--enable-multilib 

--with-system-zlib 

--enable-__cxa_atexit 

--disable-libunwind-exceptions 

--enable-gnu-unique-object

--enable-linker-build-id 

--with-gcc-major-version-only 

--enable-libstdcxx-backtrace 

--with-libstdcxx-zoneinfo=/usr/share/zoneinfo 

--with-linker-hash-style=gnu 

--enable-plugin 

--enable-initfini-array 

--with-isl=/builddir/build/BUILD/gcc-13.2.1-20231011/obj-x86_64-redhat-linux/isl-install 

--enable-offload-targets=nvptx-none 

--without-cuda-driver 

--enable-offload-defaulted 

--enable-gnu-indirect-function 

--enable-cet 

--with-tune=generic 

--with-arch_32=i686 

--build=x86_64-redhat-linux 

--with-build-config=bootstrap-lto 

--enable-link-serialization=1

Thread model: posix

Supported LTO compression algorithms: zlib zstd

gcc version 13.2.1 20231011 (Red Hat 13.2.1-4) (GCC)

 

 

　　4、【gcc  帮助信息】

[wit@fedora tmp]$ gcc  --help
Usage: gcc [options] file...
Options:
  -pass-exit-codes         Exit with highest error code from a phase.
  --help                   Display this information.
  --target-help            Display target specific command line options (including assembler and linker options).
  --help={common|optimizers|params|target|warnings|[^]{joined|separate|undocumented}}[,...].
                           Display specific types of command line options.
  (Use '-v --help' to display command line options of sub-processes).
  --version                Display compiler version information.
  -dumpspecs               Display all of the built in spec strings.
  -dumpversion             Display the version of the compiler.
  -dumpmachine             Display the compiler's target processor.
  -foffload=<targets>      Specify offloading targets.
  -print-search-dirs       Display the directories in the compiler's search path.
  -print-libgcc-file-name  Display the name of the compiler's companion library.
  -print-file-name=<lib>   Display the full path to library <lib>.
  -print-prog-name=<prog>  Display the full path to compiler component <prog>.
  -print-multiarch         Display the target's normalized GNU triplet, used as
                           a component in the library path.
  -print-multi-directory   Display the root directory for versions of libgcc.
  -print-multi-lib         Display the mapping between command line options and
                           multiple library search directories.
  -print-multi-os-directory Display the relative path to OS libraries.
  -print-sysroot           Display the target libraries directory.
  -print-sysroot-headers-suffix Display the sysroot suffix used to find headers.
  -Wa,<options>            Pass comma-separated <options> on to the assembler.
  -Wp,<options>            Pass comma-separated <options> on to the preprocessor.
  -Wl,<options>            Pass comma-separated <options> on to the linker.
  -Xassembler <arg>        Pass <arg> on to the assembler.
  -Xpreprocessor <arg>     Pass <arg> on to the preprocessor.
  -Xlinker <arg>           Pass <arg> on to the linker.
  -save-temps              Do not delete intermediate files.
  -save-temps=<arg>        Do not delete intermediate files.
  -no-canonical-prefixes   Do not canonicalize paths when building relative
                           prefixes to other gcc components.
  -pipe                    Use pipes rather than intermediate files.
  -time                    Time the execution of each subprocess.
  -specs=<file>            Override built-in specs with the contents of <file>.
  -std=<standard>          Assume that the input sources are for <standard>.
  --sysroot=<directory>    Use <directory> as the root directory for headers
                           and libraries.
  -B <directory>           Add <directory> to the compiler's search paths.
  -v                       Display the programs invoked by the compiler.
  -###                     Like -v but options quoted and commands not executed.
  -E                       Preprocess only; do not compile, assemble or link.
  -S                       Compile only; do not assemble or link.
  -c                       Compile and assemble, but do not link.
  -o <file>                Place the output into <file>.
  -pie                     Create a dynamically linked position independent
                           executable.
  -shared                  Create a shared library.
  -x <language>            Specify the language of the following input files.
                           Permissible languages include: c c++ assembler none
                           'none' means revert to the default behavior of
                           guessing the language based on the file's extension.

Options starting with -g, -f, -m, -O, -W, or --param are automatically
 passed on to the various sub-processes invoked by gcc.  In order to pass
 other options on to these processes the -W<letter> options must be used.

For bug reporting instructions, please see:
<http://bugzilla.redhat.com/bugzilla>.
[wit@fedora tmp]$ 
[wit@fedora tmp]$ 

 

 

 

 

二、源代码

// locale.c


#include <locale.h>
#include <stdio.h>
#include <time.h>

 
int main ()
{
   time_t currtime;
   struct tm *timer;
   char buffer[80];
 
   time( &currtime );
   timer = localtime( &currtime );
 
   printf("\n\nLocale is: %s\n", setlocale(LC_ALL, "en_GB.UTF-8"));
   strftime(buffer,80,"%c", timer );
   printf("Date is: %s\n", buffer);
 
   printf("\n\nLocale is: %s\n", setlocale(LC_ALL, "zh_CN.UTF-8"));
   strftime(buffer,80,"%c", timer );
   printf("Date is: %s\n", buffer);
   printf("\n\n");
 
   return 0;

}

 

 

 

 

三、运行结果

[wit@fedora tmp]$ gcc -g -Wall -std=c2x -o locale locale.c && ./locale


Locale is: en_GB.UTF-8
Date is: Thu 18 Jan 2024 22:56:25 CST


Locale is: zh_CN.UTF-8
Date is: 2024年01月18日 星期四 22时56分25秒


[wit@fedora tmp]$ 
[wit@fedora tmp]$ 

 

 

 

 

四、参考资料

 

　　1、　　C 库函数 - setlocale()　　--　　https://www.runoob.com/cprogramming/c-function-setlocale.html