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