+static int utf_8_valid(const char *str)
+{
+ yaz_iconv_t cd = yaz_iconv_open("utf-8", "utf-8");
+ if (cd)
+ {
+ /* check that query is UTF-8 encoded */
+ char *inbuf = (char *) str; /* we know iconv does not alter this */
+ size_t inbytesleft = strlen(inbuf);
+
+ size_t outbytesleft = strlen(inbuf) + 10;
+ char *out = xmalloc(outbytesleft);
+ char *outbuf = out;
+ size_t r = yaz_iconv(cd, &inbuf, &inbytesleft, &outbuf, &outbytesleft);
+
+ /* if OK, try flushing the rest */
+ if (r != (size_t) (-1))
+ r = yaz_iconv(cd, 0, 0, &outbuf, &outbytesleft);
+ yaz_iconv_close(cd);
+ xfree(out);
+ if (r == (size_t) (-1))
+ return 0;
+ }
+ return 1;
+}
+