- a switch for aneristic purposes

ddate.1

@@ -7,6 +7,9 @@ ddate \- convert Gregorian dates to Discordian dates
 .B ddate
 .RI [ \fB+\fPformat]
 .RI [ date ]
+.B ddate
+.RI \-a
+.RI [ date ]
 .SH DESCRIPTION
 .B ddate
 prints the date in Discordian date format.
@@ -77,6 +80,9 @@ Celebrate Bureflux
 Today's St. Tib's Day, 3162.
 .br
 
+.SH OPTIONS
+.br -a converts a discordian date into gregorian date
+
 .SH BUGS
 
 .B ddate(1)
@@ -98,6 +104,8 @@ Major rewrite by Lee H:. O:. Smith, KYTP, aka Andrew Bulhak (acb@dev.null.org)
 .br
 Gregorian B.C.E. dates fixed by Chaplain Nyan the Wiser, aka Dan Dart (ntw@dandart.co.uk)
 .br
+Added curse of the greyface by Franz_Nord
+.br
 Five tons of flax.
 
 .SH DISTRIBUTION POLICY

ddate.c

@@ -43,6 +43,9 @@
    15th of Confusion, 3180:
    - call out adherents of the wrong fruit
 
+   40th of Confusion, 3184 Franz_Nord
+   - -a option added the curse of the greyface
+
    FIVE TONS OF FLAX
 */
 
@@ -180,6 +183,7 @@ int load_fortunes(char *fn, char *delim, char** result);
 
 struct disc_time convert(int,int);
 struct disc_time makeday(int,int,int);
+struct disc_time unmakeday(int,int,int);
 
 int
 main (int argc, char *argv[]) {
@@ -204,6 +208,7 @@ main (int argc, char *argv[]) {
 	    switch(argv[pi][1]) {
 	    case 'V':
 		printf(("%s (%s)\n"), progname, PACKAGE_STRING);
+	    case 'a': goto aneris;
 	    default: goto usage;
 	    }
 	default: goto thud;
@@ -240,6 +245,27 @@ main (int argc, char *argv[]) {
     format(schwa, fnord, hastur);
     printf("%s\n", schwa);
 
+    return 0;
+  aneris:
+    if (argc-pi==4){
+        int moe=atoi(argv[pi+1]), larry=atoi(argv[pi+2]), curly=atoi(argv[pi+3]);
+	hastur = unmakeday(
+ #ifdef US_FORMAT
+           moe,larry,
+ #else
+           larry,moe,
+ #endif
+           curly);
+	if (hastur.season == -1){
+		printf("Invalid date -- out of range\n");
+		return -1;
+	}
+#ifdef US_FORMAT
+	printf("%d %d %d\n", hastur.season, hastur.day, hastur.year);
+#else
+	printf("%d %d %d\n", hastur.day, hastur.season, hastur.year);
+#endif
+    }
     return 0;
 }
 
@@ -356,6 +382,42 @@ struct disc_time makeday(int imonth,int iday,int iyear) /*i for input */
     return funkychickens;
 }
 
+struct disc_time unmakeday(int imonth, int iday, int iyear)
+{
+    struct disc_time funkychickens;
+    int days;
+    int month;
+    int cal[12] = { 31,28,31,30,31,30,31,31,30,31,30,31 };
+    int leap;
+
+    memset(&funkychickens,0,sizeof(funkychickens));
+
+    /* basic range checks */
+    if(iday < 1 || iday > 73 | imonth < 1 || imonth > 5)
+    {
+	funkychickens.season = -1;
+	return funkychickens;
+    }
+
+    month = 0;
+    days = iday + (imonth - 1) * 73;
+    funkychickens.year = iyear-1166;
+    leap = leapp(iyear);
+    days += leap;
+
+    while(days>cal[month] || (leap && month == 1 && days>cal[month]+1)) {
+	days -= (cal[month] + ((leap && month == 1) ? 1 : 0));
+	month++;
+    }
+
+    month++;
+    funkychickens.season = month;
+    funkychickens.day = days;
+
+    // TODO: restumrechnung
+    return funkychickens;
+}
+
 struct disc_time convert(int nday, int nyear)
 {  struct disc_time funkychickens;