use _NL_TIME_WEEK_1STDAY to determin the first day of the week.

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@2018 a5681a0c-68f1-0310-ab6d-d61299d08faa

diff --git a/program/src/rrd_graph.c b/program/src/rrd_graph.c
index bd7e3c341a2dd3f8934146736f14c3914363bcd0..390a66ec162ebe8ee80c48cf3932a62bf5eab7ed 100644 (file)
--- a/program/src/rrd_graph.c
+++ b/program/src/rrd_graph.c
@@ -1364,7 +1364,11 @@ static int find_first_weekday(void){
     static int first_weekday = -1;
     if (first_weekday == -1){
 #if defined(HAVE_NL_LANGINFO)
-        first_weekday = nl_langinfo(_NL_TIME_FIRST_WEEKDAY)[0] - 1;
+        /* according to http://sourceware.org/ml/libc-locales/2009-q1/msg00011.html */
+        long week_1stday_l = (long) nl_langinfo (_NL_TIME_WEEK_1STDAY);
+        if (week_1stday_l == 19971130) first_weekday = 0; /* Sun */
+        else if (week_1stday_l == 19971201) first_weekday = 1; /* Mon */
+        else first_weekday = 1; /* we go for a monday default */
 #else
         first_weekday = 1;
 #endif