common/strutils.cpp

   1
   2 #include "config.h"
   3
   4 #include "strutils.h"
   5
   6 #include <cstdlib>
   7
   8
   9 #ifdef _WIN32
  10 #define WIN32_LEAN_AND_MEAN
  11 #include <windows.h>
  12
  13 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 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 #endif
  43
  44 namespace al {
  45
  46 al::optional<std::string> getenv(const char *envname)
  47 {
  48     const char *str{std::getenv(envname)};
  49     if(str && str[0] != '\0')
  50         return al::make_optional<std::string>(str);
  51     return al::nullopt;
  52 }
  53
  54 #ifdef _WIN32
  55 al::optional<std::wstring> getenv(const WCHAR *envname)
  56 {
  57     const WCHAR *str{_wgetenv(envname)};
  58     if(str && str[0] != L'\0')
  59         return al::make_optional<std::wstring>(str);
  60     return al::nullopt;
  61 }
  62 #endif
  63
  64 } // namespace al