[PATCH] strftime: support %q to output the quarter of year

["Pádraig Brady" <P@draigBrady.com>]

This is already supported by gnulib.

* manual/time.texi: Document %q outputs quarter 1..4.
* time/strftime_l.c: Implement %q.
---
 manual/time.texi  | 6 ++++++
 time/strftime_l.c | 4 ++++
 2 files changed, 10 insertions(+)

diff --git a/manual/time.texi b/manual/time.texi
index 8a5f94e..f4c5f87 100644
--- a/manual/time.texi
+++ b/manual/time.texi
@@ -1510,6 +1510,12 @@ most locales @samp{AM}/@samp{PM} format is not supported, in such cases
 
 This format is a GNU extension.
 
+@item %q
+Quarter of the year (@samp{1}@dots{}@samp{4}),
+with January starting the first quarter.
+
+This format is a GNU extension.
+
 @item %r
 The complete calendar time using the AM/PM format of the current locale.
 
diff --git a/time/strftime_l.c b/time/strftime_l.c
index 869e0b9..13db490 100644
--- a/time/strftime_l.c
+++ b/time/strftime_l.c
@@ -1108,6 +1108,10 @@ __strftime_internal (s, maxsize, format, tp, tzset_called ut_argument
 	  goto underlying_strftime;
 #endif
 
+        case L_('q'):           /* GNU extension.  */
+          DO_SIGNED_NUMBER (1, tp->tm_mon < -3, tp->tm_mon / 3 + 1U);
+          break;
+
 	case L_('R'):
 	  subfmt = L_("%H:%M");
 	  goto subformat;
-- 
2.5.5