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