[c]: 语言环境设置 -- setlocale()

[c]:  语言环境设置 -- setlocale()

一、语言环境设置【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】

 1 [wit@fedora tmp]$ gcc -v
 2 
 3 Using built-in specs.
 4 
 5 COLLECT_GCC=gcc
 6 
 7 COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/13/lto-wrapper
 8 
 9 OFFLOAD_TARGET_NAMES=nvptx-none
10 
11 OFFLOAD_TARGET_DEFAULT=1
12 
13 Target: x86_64-redhat-linux
14 
15 Configured with: ../configure 
16 
17 --enable-bootstrap 
18 
19 --enable-languages=c,c++,fortran,objc,obj-c++,ada,go,d,m2,lto 
20 
21 --prefix=/usr 
22 
23 --mandir=/usr/share/man 
24 
25 --infodir=/usr/share/info 
26 
27 --with-bugurl=http://bugzilla.redhat.com/bugzilla 
28 
29 --enable-shared 
30 
31 --enable-threads=posix 
32 
33 --enable-checking=release 
34 
35 --enable-multilib 
36 
37 --with-system-zlib 
38 
39 --enable-__cxa_atexit 
40 
41 --disable-libunwind-exceptions 
42 
43 --enable-gnu-unique-object
44 
45 --enable-linker-build-id 
46 
47 --with-gcc-major-version-only 
48 
49 --enable-libstdcxx-backtrace 
50 
51 --with-libstdcxx-zoneinfo=/usr/share/zoneinfo 
52 
53 --with-linker-hash-style=gnu 
54 
55 --enable-plugin 
56 
57 --enable-initfini-array 
58 
59 --with-isl=/builddir/build/BUILD/gcc-13.2.1-20231011/obj-x86_64-redhat-linux/isl-install 
60 
61 --enable-offload-targets=nvptx-none 
62 
63 --without-cuda-driver 
64 
65 --enable-offload-defaulted 
66 
67 --enable-gnu-indirect-function 
68 
69 --enable-cet 
70 
71 --with-tune=generic 
72 
73 --with-arch_32=i686 
74 
75 --build=x86_64-redhat-linux 
76 
77 --with-build-config=bootstrap-lto 
78 
79 --enable-link-serialization=1
80 
81 Thread model: posix
82 
83 Supported LTO compression algorithms: zlib zstd
84 
85 gcc version 13.2.1 20231011 (Red Hat 13.2.1-4) (GCC)

　　4、【gcc  帮助信息】

 1 [wit@fedora tmp]$ gcc  --help
 2 Usage: gcc [options] file...
 3 Options:
 4   -pass-exit-codes         Exit with highest error code from a phase.
 5   --help                   Display this information.
 6   --target-help            Display target specific command line options (including assembler and linker options).
 7   --help={common|optimizers|params|target|warnings|[^]{joined|separate|undocumented}}[,...].
 8                            Display specific types of command line options.
 9   (Use '-v --help' to display command line options of sub-processes).
10   --version                Display compiler version information.
11   -dumpspecs               Display all of the built in spec strings.
12   -dumpversion             Display the version of the compiler.
13   -dumpmachine             Display the compiler's target processor.
14   -foffload=<targets>      Specify offloading targets.
15   -print-search-dirs       Display the directories in the compiler's search path.
16   -print-libgcc-file-name  Display the name of the compiler's companion library.
17   -print-file-name=<lib>   Display the full path to library <lib>.
18   -print-prog-name=<prog>  Display the full path to compiler component <prog>.
19   -print-multiarch         Display the target's normalized GNU triplet, used as
20                            a component in the library path.
21   -print-multi-directory   Display the root directory for versions of libgcc.
22   -print-multi-lib         Display the mapping between command line options and
23                            multiple library search directories.
24   -print-multi-os-directory Display the relative path to OS libraries.
25   -print-sysroot           Display the target libraries directory.
26   -print-sysroot-headers-suffix Display the sysroot suffix used to find headers.
27   -Wa,<options>            Pass comma-separated <options> on to the assembler.
28   -Wp,<options>            Pass comma-separated <options> on to the preprocessor.
29   -Wl,<options>            Pass comma-separated <options> on to the linker.
30   -Xassembler <arg>        Pass <arg> on to the assembler.
31   -Xpreprocessor <arg>     Pass <arg> on to the preprocessor.
32   -Xlinker <arg>           Pass <arg> on to the linker.
33   -save-temps              Do not delete intermediate files.
34   -save-temps=<arg>        Do not delete intermediate files.
35   -no-canonical-prefixes   Do not canonicalize paths when building relative
36                            prefixes to other gcc components.
37   -pipe                    Use pipes rather than intermediate files.
38   -time                    Time the execution of each subprocess.
39   -specs=<file>            Override built-in specs with the contents of <file>.
40   -std=<standard>          Assume that the input sources are for <standard>.
41   --sysroot=<directory>    Use <directory> as the root directory for headers
42                            and libraries.
43   -B <directory>           Add <directory> to the compiler's search paths.
44   -v                       Display the programs invoked by the compiler.
45   -###                     Like -v but options quoted and commands not executed.
46   -E                       Preprocess only; do not compile, assemble or link.
47   -S                       Compile only; do not assemble or link.
48   -c                       Compile and assemble, but do not link.
49   -o <file>                Place the output into <file>.
50   -pie                     Create a dynamically linked position independent
51                            executable.
52   -shared                  Create a shared library.
53   -x <language>            Specify the language of the following input files.
54                            Permissible languages include: c c++ assembler none
55                            'none' means revert to the default behavior of
56                            guessing the language based on the file's extension.
57 
58 Options starting with -g, -f, -m, -O, -W, or --param are automatically
59  passed on to the various sub-processes invoked by gcc.  In order to pass
60  other options on to these processes the -W<letter> options must be used.
61 
62 For bug reporting instructions, please see:
63 <http://bugzilla.redhat.com/bugzilla>.
64 [wit@fedora tmp]$ 
65 [wit@fedora tmp]$ 

二、源代码

 1 [wit@fedora tmp]$ cat  locale.c 
 2 #include <locale.h>
 3 #include <stdio.h>
 4 #include <time.h>
 5  
 6 int main ()
 7 {
 8    time_t currtime;
 9    struct tm *timer;
10    char buffer[80];
11  
12    time( &currtime );
13    timer = localtime( &currtime );
14  
15    printf("Locale is: %s\n", setlocale(LC_ALL, "en_GB.UTF-8"));
16    strftime(buffer,80,"%c", timer );
17    printf("Date is: %s\n", buffer);
18  
19   
20    printf("Locale is: %s\n", setlocale(LC_ALL, "zh_CN.UTF-8"));
21    strftime(buffer,80,"%c", timer );
22    printf("Date is: %s\n", buffer);
23  
24    return(0);
25 }

三、运行结果

1 [wit@fedora tmp]$ gcc -g -Wall -std=c2x -o locale locale.c && ./locale
2 Locale is: en_GB.UTF-8
3 Date is: Thu 18 Jan 2024 22:50:30 CST
4 Locale is: zh_CN.UTF-8
5 Date is: 2024年01月18日 星期四 22时50分30秒
6 [wit@fedora tmp]$ 
7 [wit@fedora tmp]$ 

四、参考资料

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