git.sesse.net Git - ccbs/blob - bigscreen/widestring.cpp

   1 #include <iconv.h>
   2 #include <endian.h>
   3 #include <exception>
   4 #include <pqxx/util>
   5 #include "widestring.h"
   6
   7 static iconv_t ucs4_iconv;
   8 static bool iconv_initialized = false;
   9
  10 widestring::widestring()
  11 {
  12 }
  13
  14 widestring::widestring(const char *from)
  15 {
  16         *this = from;
  17 }
  18
  19 void widestring::operator= (const char *from)
  20 {
  21         if (!iconv_initialized) {
  22 #if __BYTE_ORDER == __LITTLE_ENDIAN
  23                 ucs4_iconv = iconv_open("ucs-4le", "utf-8");
  24 #else
  25                 ucs4_iconv = iconv_open("ucs-4be", "utf-8");
  26 #endif
  27
  28                 iconv_initialized = true;
  29         }
  30
  31         unsigned bytes = std::strlen(from);
  32         char *from_buf = strdup(from);
  33         wchar_t *to_buf = new wchar_t[bytes + 1];
  34
  35         char *inptr = from_buf, *outptr = reinterpret_cast<char *> (to_buf);
  36
  37         size_t in_left = bytes;
  38         size_t out_left = bytes * sizeof(wchar_t);
  39
  40         size_t ret = iconv(ucs4_iconv, NULL, NULL, &outptr, &out_left);
  41         if (ret == (size_t)(-1)) {
  42                 throw std::runtime_error("Error in iconv during initialization");
  43         }
  44
  45         ret = iconv(ucs4_iconv, &inptr, &in_left, &outptr, &out_left);
  46         if (ret == (size_t)(-1)) {
  47                 perror("iconv");
  48                 throw std::runtime_error("Error in iconv during conversion");
  49         }
  50
  51         erase(begin(), end());
  52         std::copy(to_buf, reinterpret_cast<wchar_t *> (outptr), std::back_inserter(*this));
  53
  54         free(from_buf);
  55         delete[] to_buf;
  56 }
  57
  58 template<>
  59 void pqxx::from_string<widestring>(const char *from, widestring &to)
  60 {
  61         to = from;
  62 }
  63