From 05779fbb9b641aa19c4ca0dc2283d62eadaa18fc Mon Sep 17 00:00:00 2001
From: Selva Nair <selva.nair@gmail.com>
Date: Sun, 26 Jun 2022 15:37:11 -0400
Subject: [PATCH] Add LocalizedFileTime function

- refactor LocalizedTime

Signed-off-by: Selva Nair <selva.nair@gmail.com>
---
 localization.c | 61 ++++++++++++++++++++++++++++++++++++++++----------
 localization.h |  1 +
 2 files changed, 50 insertions(+), 12 deletions(-)

diff --git a/localization.c b/localization.c
index ca385f8..ea204ce 100644
--- a/localization.c
+++ b/localization.c
@@ -101,33 +101,70 @@ SetGUILanguage(LANGID langId)
     gui_language = langId;
 }
 
-int
-LocalizedTime(const time_t t, LPTSTR buf, size_t size)
+static int
+LocalizedSystemTime(const SYSTEMTIME *st, wchar_t *buf, size_t size)
 {
-    /* Convert Unix timestamp to Win32 SYSTEMTIME */
-    FILETIME lft;
-    SYSTEMTIME st;
-    LONGLONG tmp = Int32x32To64(t, 10000000) + 116444736000000000;
-    FILETIME ft = { .dwLowDateTime = (DWORD) tmp, .dwHighDateTime = tmp >> 32};
-    FileTimeToLocalFileTime(&ft, &lft);
-    FileTimeToSystemTime(&lft, &st);
-
     int date_size = 0, time_size = 0;
     LCID locale = MAKELCID(GetGUILanguage(), SORT_DEFAULT);
 
+    if (size == 0 || buf == NULL)
+    {
+        date_size = GetDateFormat(locale, DATE_SHORTDATE, st, NULL, NULL, 0);
+        time_size = GetTimeFormat(locale, TIME_NOSECONDS, st, NULL, NULL, 0);
+        return date_size + time_size;
+    }
+
     if (size > 0) {
-        date_size = GetDateFormat(locale, DATE_SHORTDATE, &st, NULL,
+        date_size = GetDateFormat(locale, DATE_SHORTDATE, st, NULL,
                                   buf, size);
         if (date_size)
             buf[date_size - 1] = ' ';
     }
     if (size - date_size > 0) {
-        time_size = GetTimeFormat(locale, TIME_NOSECONDS, &st, NULL,
+        time_size = GetTimeFormat(locale, TIME_NOSECONDS, st, NULL,
                                   buf + date_size, size - date_size);
     }
     return date_size + time_size;
 }
 
+/*
+ * Convert filetime to a wide character string -- caller must free the
+ * result after use.
+ */
+wchar_t *
+LocalizedFileTime(const FILETIME *ft)
+{
+    FILETIME lft;
+    SYSTEMTIME st;
+    FileTimeToLocalFileTime(ft, &lft);
+    FileTimeToSystemTime(&lft, &st);
+    wchar_t *buf = NULL;
+
+    int size = LocalizedSystemTime(&st, NULL, 0);
+    if (size > 0)
+    {
+        buf = calloc(1, size*sizeof(wchar_t));
+        if (buf)
+        {
+            LocalizedSystemTime(&st, buf, size);
+        }
+    }
+    return buf;
+}
+
+int
+LocalizedTime(const time_t t, LPTSTR buf, size_t size)
+{
+    /* Convert Unix timestamp to Win32 SYSTEMTIME */
+    FILETIME lft;
+    SYSTEMTIME st;
+    LONGLONG tmp = Int32x32To64(t, 10000000) + 116444736000000000;
+    FILETIME ft = { .dwLowDateTime = (DWORD) tmp, .dwHighDateTime = tmp >> 32};
+    FileTimeToLocalFileTime(&ft, &lft);
+    FileTimeToSystemTime(&lft, &st);
+
+    return LocalizedSystemTime(&st, buf, size);
+}
 
 static int
 LoadStringLang(UINT stringId, LANGID langId, PTSTR buffer, int bufferSize, va_list args)
diff --git a/localization.h b/localization.h
index 856ffe1..18eec80 100644
--- a/localization.h
+++ b/localization.h
@@ -23,6 +23,7 @@
 #define LOCALIZATION_H
 
 int LocalizedTime(const time_t, LPTSTR, size_t);
+wchar_t *LocalizedFileTime(const FILETIME *ft);
 PTSTR LoadLocalizedString(const UINT, ...);
 int LoadLocalizedStringBuf(PTSTR, const int, const UINT, ...);
 void ShowLocalizedMsg(const UINT, ...);