Windows: use wcsftime instead of strftime

src/utils/conftree.cpp

@@ -16,6 +16,7 @@
  */
 #ifdef BUILDING_RECOLL
 #include "autoconfig.h"
+#include "transcode.h"
 #else
 #include "config.h"
 #endif

src/utils/rclutil.cpp

@@ -49,6 +49,7 @@
 #include "md5ut.h"
 #include "log.h"
 #include "smallut.h"
+#include "rclconfig.h"
 
 using namespace std;
 
@@ -277,6 +278,23 @@ string url_gpathS(const string& url)
 #endif
 }
 
+std::string utf8datestring(const std::string& format, struct tm *tm)
+{
+    string u8date;
+#ifdef _WIN32
+    wchar_t wformat[200];
+    utf8towchar(format, wformat, 199);
+    wchar_t wdate[250];
+    wcsftime(wdate, 250, wformat, tm);
+    wchartoutf8(wformat, u8date);
+#else
+    char datebuf[200];
+    strftime(datebuf, 199, format.c_str(), tm);
+    transcode(datebuf, u8date, RclConfig::getLocaleCharset(), "UTF-8");
+#endif
+    return u8date;
+}
+
 const string& tmplocation()
 {
     static string stmpdir;

src/utils/rclutil.h

@@ -47,6 +47,10 @@ extern bool printableUrl(const std::string& fcharset,
 /// "/c/" This should be used only for splitting the path in rcldb.
 extern std::string url_gpathS(const std::string& url);
 
+/// Like strftime but guaranteed utf-8 output (esp. useful on Windows)
+struct tm;
+extern std::string utf8datestring(const std::string& format, struct tm *tm);
+
 /// Retrieve the temp dir location: $RECOLL_TMPDIR else $TMPDIR else /tmp
 extern const std::string& tmplocation();