common/win_main_utf8.h

   1 #ifndef WIN_MAIN_UTF8_H
   2 #define WIN_MAIN_UTF8_H
   3
   4 /* For Windows systems this provides a way to get UTF-8 encoded argv strings,
   5  * and also overrides fopen to accept UTF-8 filenames. Working with wmain
   6  * directly complicates cross-platform compatibility, while normal main() in
   7  * Windows uses the current codepage (which has limited availability of
   8  * characters).
   9  *
  10  * For MinGW, you must link with -municode
  11  */
  12 #ifdef _WIN32
  13 #define WIN32_LEAN_AND_MEAN
  14 #include <windows.h>
  15 #include <shellapi.h>
  16
  17 static FILE *my_fopen(const char *fname, const char *mode)
  18 {
  19     WCHAR *wname=NULL, *wmode=NULL;
  20     int namelen, modelen;
  21     FILE *file = NULL;
  22     errno_t err;
  23
  24     namelen = MultiByteToWideChar(CP_UTF8, 0, fname, -1, NULL, 0);
  25     modelen = MultiByteToWideChar(CP_UTF8, 0, mode, -1, NULL, 0);
  26
  27     if(namelen <= 0 || modelen <= 0)
  28     {
  29         fprintf(stderr, "Failed to convert UTF-8 fname \"%s\", mode \"%s\"\n", fname, mode);
  30         return NULL;
  31     }
  32
  33     wname = calloc(sizeof(WCHAR), namelen+modelen);
  34     wmode = wname + namelen;
  35     MultiByteToWideChar(CP_UTF8, 0, fname, -1, wname, namelen);
  36     MultiByteToWideChar(CP_UTF8, 0, mode, -1, wmode, modelen);
  37
  38     err = _wfopen_s(&file, wname, wmode);
  39     if(err)
  40     {
  41         errno = err;
  42         file = NULL;
  43     }
  44
  45     free(wname);
  46
  47     return file;
  48 }
  49 #define fopen my_fopen
  50
  51
  52 static char **arglist;
  53 static void cleanup_arglist(void)
  54 {
  55     free(arglist);
  56 }
  57
  58 static void GetUnicodeArgs(int *argc, char ***argv)
  59 {
  60     size_t total;
  61     wchar_t **args;
  62     int nargs, i;
  63
  64     args = CommandLineToArgvW(GetCommandLineW(), &nargs);
  65     if(!args)
  66     {
  67         fprintf(stderr, "Failed to get command line args: %ld\n", GetLastError());
  68         exit(EXIT_FAILURE);
  69     }
  70
  71     total = sizeof(**argv) * nargs;
  72     for(i = 0;i < nargs;i++)
  73         total += WideCharToMultiByte(CP_UTF8, 0, args[i], -1, NULL, 0, NULL, NULL);
  74
  75     atexit(cleanup_arglist);
  76     arglist = *argv = calloc(1, total);
  77     (*argv)[0] = (char*)(*argv + nargs);
  78     for(i = 0;i < nargs-1;i++)
  79     {
  80         int len = WideCharToMultiByte(CP_UTF8, 0, args[i], -1, (*argv)[i], 65535, NULL, NULL);
  81         (*argv)[i+1] = (*argv)[i] + len;
  82     }
  83     WideCharToMultiByte(CP_UTF8, 0, args[i], -1, (*argv)[i], 65535, NULL, NULL);
  84     *argc = nargs;
  85
  86     LocalFree(args);
  87 }
  88 #define GET_UNICODE_ARGS(argc, argv) GetUnicodeArgs(argc, argv)
  89
  90 #else
  91
  92 /* Do nothing. */
  93 #define GET_UNICODE_ARGS(argc, argv)
  94
  95 #endif
  96
  97 #endif /* WIN_MAIN_UTF8_H */