ref: 779ea4dafdf5cdbd3b0cf2bd36c1e6070a18ad39
dir: /examples/win32utf8.c/
#if defined(_WIN32)
# include <stdio.h>
# include <stdlib.h>
# include <wchar.h>
/*We need the following two to set stdin/stdout to binary.*/
# include <io.h>
# include <fcntl.h>
# define WIN32_LEAN_AND_MEAN
# define WIN32_EXTRA_LEAN
# include <windows.h>
# include "win32utf8.h"
static char *utf16_to_utf8(const wchar_t *_src){
char *dst;
size_t len;
size_t si;
size_t di;
len=wcslen(_src);
dst=(char *)malloc(sizeof(*dst)*(3*len+1));
if(dst==NULL)return dst;
for(di=si=0;si<len;si++){
unsigned c0;
c0=_src[si];
if(c0<0x80){
/*Can be represented by a 1-byte sequence.*/
dst[di++]=(char)c0;
continue;
}
else if(c0<0x800){
/*Can be represented by a 2-byte sequence.*/
dst[di++]=(char)(0xC0|c0>>6);
dst[di++]=(char)(0x80|c0&0x3F);
continue;
}
else if(c0>=0xD800&&c0<0xDC00){
unsigned c1;
/*This is safe, because c0 was not 0 and _src is NUL-terminated.*/
c1=_src[si+1];
if(c1>=0xDC00&&c1<0xE000){
unsigned w;
/*Surrogate pair.*/
w=((c0&0x3FF)<<10|c1&0x3FF)+0x10000;
/*Can be represented by a 4-byte sequence.*/
dst[di++]=(char)(0xF0|w>>18);
dst[di++]=(char)(0x80|w>>12&0x3F);
dst[di++]=(char)(0x80|w>>6&0x3F);
dst[di++]=(char)(0x80|w&0x3F);
si++;
continue;
}
}
/*Anything else is either a valid 3-byte sequence, an invalid surrogate
pair, or 'not a character'.
In the latter two cases, we just encode the value as a 3-byte
sequence anyway (producing technically invalid UTF-8).
Later error handling will detect the problem, with a better
chance of giving a useful error message.*/
dst[di++]=(char)(0xE0|c0>>12);
dst[di++]=(char)(0x80|c0>>6&0x3F);
dst[di++]=(char)(0x80|c0&0x3F);
}
dst[di++]='\0';
return dst;
}
typedef LPWSTR *(APIENTRY *command_line_to_argv_w_func)(LPCWSTR cmd_line,
int *num_args);
/*Make a best-effort attempt to support UTF-8 on Windows.*/
void win32_utf8_setup(int *_argc,const char ***_argv){
HMODULE hlib;
/*We need to set stdin/stdout to binary mode.
This is unrelated to UTF-8 support, but it's platform specific and we need
to do it in the same places.*/
_setmode(_fileno(stdin),_O_BINARY);
_setmode(_fileno(stdout),_O_BINARY);
hlib=LoadLibraryA("shell32.dll");
if(hlib!=NULL){
command_line_to_argv_w_func command_line_to_argv_w;
/*This function is only available on Windows 2000 or later.*/
command_line_to_argv_w=(command_line_to_argv_w_func)GetProcAddress(hlib,
"CommandLineToArgvW");
if(command_line_to_argv_w!=NULL){
wchar_t **argvw;
int argc;
argvw=(*command_line_to_argv_w)(GetCommandLineW(),&argc);
if(argvw!=NULL){
int ai;
/*Really, I don't see why argc would ever differ from *_argc, but let's
be paranoid.*/
if(argc>*_argc)argc=*_argc;
for(ai=0;ai<argc;ai++){
char *argv;
argv=utf16_to_utf8(argvw[ai]);
if(argv!=NULL)(*_argv)[ai]=argv;
}
*_argc=argc;
LocalFree(argvw);
}
}
FreeLibrary(hlib);
}
# if defined(CP_UTF8)
/*This does not work correctly in all environments (it breaks output in
mingw32 for me), and requires a Unicode font (e.g., when using the default
Raster font, even characters that are available in the font's codepage
won't display properly).*/
/*SetConsoleOutputCP(CP_UTF8);*/
# endif
}
#endif