[PATCH v2 1/2] ucrtbase: strftime %z returns 4-digit timezone.

[Jeff Smith]

Signed-off-by: Jeff Smith 
---
 dlls/msvcrt/time.c         | 26 ++++++++++++++++++++++++++
 dlls/ucrtbase/tests/misc.c |  6 ++++++
 2 files changed, 32 insertions(+)

diff --git a/dlls/msvcrt/time.c b/dlls/msvcrt/time.c
index 9787d18e3f..535ea2dbd7 100644
--- a/dlls/msvcrt/time.c
+++ b/dlls/msvcrt/time.c
@@ -1033,6 +1033,26 @@ static inline BOOL strftime_time(char *str, MSVCRT_size_t *pos, MSVCRT_size_t ma
     return TRUE;
 }

+static inline BOOL strftime_tzdiff(char *str, MSVCRT_size_t *pos, MSVCRT_size_t max, int dst)
+{
+    MSVCRT_size_t len;
+    MSVCRT_long tz = MSVCRT___timezone + (dst * MSVCRT__dstbias);
+
+    char sign = (tz > 0) ? '-' : '+';
+    unsigned int minutes = ((tz < 0) ? -tz : tz) / 60;
+    unsigned int hours = minutes / 60;
+
+    len = MSVCRT__snprintf(str+*pos, max-*pos, "%c%02u%02u", sign, hours, minutes % 60);
+    if(len == -1) {
+        *str = 0;
+        *MSVCRT__errno() = MSVCRT_ERANGE;
+        return FALSE;
+    }
+
+    *pos += len;
+    return TRUE;
+}
+
 static inline BOOL strftime_str(char *str, MSVCRT_size_t *pos, MSVCRT_size_t max, char *src)
 {
     MSVCRT_size_t len = strlen(src);
@@ -1300,6 +1320,12 @@ static MSVCRT_size_t strftime_helper(char *str, MSVCRT_size_t max, const char *f
                 return 0;
             break;
         case 'z':
+#if _MSVCR_VER>=140
+            MSVCRT__tzset();
+            if(!strftime_tzdiff(str, &ret, max, mstm->tm_isdst ? 1 : 0))
+                return 0;
+            break;
+#endif
         case 'Z':
             MSVCRT__tzset();
             if(MSVCRT__get_tzname(&tmp, str+ret, max-ret, mstm->tm_isdst ? 1 : 0))
diff --git a/dlls/ucrtbase/tests/misc.c b/dlls/ucrtbase/tests/misc.c
index 3a1598fee2..014d66d595 100644
--- a/dlls/ucrtbase/tests/misc.c
+++ b/dlls/ucrtbase/tests/misc.c
@@ -1005,6 +1005,12 @@ static void test_strftime(void)
     todo_wine ok(retA == 2, "expected 2, got %d\n", (int)retA);
     todo_wine ok(!strcmp(bufA, "53"), "got %s\n", bufA);

+    retA = p_strftime(bufA, sizeof(bufA), "%z", &tm2);
+    ok(retA == 5, "expected 5, got %d\n", (int)retA);
+    ok((bufA[0] == '+' || bufA[0] == '-') &&
+        isdigit(bufA[1]) && isdigit(bufA[2]) &&
+        isdigit(bufA[3]) && isdigit(bufA[4]), "got %s\n", bufA);
+
     for(i=0; i<14; i++)
     {
         __time32_t t = (365*2 + i - 7) * 24 * 60 * 60;