+#include <iconv.h>
+#include <endian.h>
+#include <exception>
+#include <pqxx/util>
+#include "widestring.h"
+
+static iconv_t ucs4_iconv;
+static bool iconv_initialized = false;
+
+void widestring::operator= (const char *from)
+{
+ if (!iconv_initialized) {
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+ ucs4_iconv = iconv_open("ucs-4le", "utf-8");
+#else
+ ucs4_iconv = iconv_open("ucs-4be", "utf-8");
+#endif
+
+ iconv_initialized = true;
+ }
+
+ unsigned bytes = std::strlen(from);
+ char *from_buf = strdup(from);
+ wchar_t *to_buf = new wchar_t[bytes + 1];
+
+ char *inptr = from_buf, *outptr = reinterpret_cast<char *> (to_buf);
+
+ size_t in_left = bytes;
+ size_t out_left = bytes * sizeof(wchar_t);
+
+ size_t ret = iconv(ucs4_iconv, NULL, NULL, &outptr, &out_left);
+ if (ret == (size_t)(-1)) {
+ throw std::runtime_error("Error in iconv during initialization");
+ }
+
+ ret = iconv(ucs4_iconv, &inptr, &in_left, &outptr, &out_left);
+ if (ret == (size_t)(-1)) {
+ perror("iconv");
+ throw std::runtime_error("Error in iconv during conversion");
+ }
+
+ erase(begin(), end());
+ std::copy(to_buf, reinterpret_cast<wchar_t *> (outptr), std::back_inserter(*this));
+
+ free(from_buf);
+ delete[] to_buf;
+}
+
+template<>
+void pqxx::from_string<widestring>(const char *from, widestring &to)
+{
+ to = from;
+}
+