#include <locale.h>
+#ifdef HAVE_LANGINFO_H
+#include <langinfo.h>
+#endif
+
#include "rrd_graph.h"
#include "rrd_client.h"
}
+static int find_first_weekday(void){
+ static int first_weekday = -1;
+ if (first_weekday == -1){
+#if defined(HAVE_NL_LANGINFO)
+ /* 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
+ }
+ return first_weekday;
+}
/* identify the point where the first gridline, label ... gets placed */
tm. tm_sec = 0;
tm. tm_min = 0;
tm. tm_hour = 0;
- tm. tm_mday -= tm.tm_wday - 1; /* -1 because we want the monday */
+ tm. tm_mday -= tm.tm_wday - find_first_weekday();
- if (tm.tm_wday == 0)
- tm. tm_mday -= 7; /* we want the *previous* monday */
+ if (tm.tm_wday == 0 && find_first_weekday() > 0)
+ tm. tm_mday -= 7; /* we want the *previous* week */
break;
case TMT_MONTH: