common/strutils.h

   1 #ifndef AL_STRUTILS_H
   2 #define AL_STRUTILS_H
   3
   4 #include <string>
   5
   6 #include "aloptional.h"
   7
   8 #ifdef _WIN32
   9 #define WIN32_LEAN_AND_MEAN
  10 #include <windows.h>
  11
  12
  13 inline std::string wstr_to_utf8(const WCHAR *wstr)
  14 {
  15     std::string ret;
  16
  17     int len = WideCharToMultiByte(CP_UTF8, 0, wstr, -1, nullptr, 0, nullptr, nullptr);
  18     if(len > 0)
  19     {
  20         ret.resize(len);
  21         WideCharToMultiByte(CP_UTF8, 0, wstr, -1, &ret[0], len, nullptr, nullptr);
  22         ret.pop_back();
  23     }
  24
  25     return ret;
  26 }
  27
  28 inline std::wstring utf8_to_wstr(const char *str)
  29 {
  30     std::wstring ret;
  31
  32     int len = MultiByteToWideChar(CP_UTF8, 0, str, -1, nullptr, 0);
  33     if(len > 0)
  34     {
  35         ret.resize(len);
  36         MultiByteToWideChar(CP_UTF8, 0, str, -1, &ret[0], len);
  37         ret.pop_back();
  38     }
  39
  40     return ret;
  41 }
  42
  43 #endif
  44
  45 namespace al {
  46
  47 al::optional<std::string> getenv(const char *envname);
  48 #ifdef _WIN32
  49 al::optional<std::wstring> getenv(const WCHAR *envname);
  50 #endif
  51
  52 } // namespace al
  53
  54 #endif /* AL_STRUTILS_H */