alters cal(1) to ignore case of month names and abbreviations on command line.
this way, month names from mail headers and messages can be passed unchanged.

Reference: /n/sources/patch/maybe/cal-mon-icase
Date: Tue Mar  2 16:19:46 CET 2010
Signed-off-by: yarikos@gmail.com

--- /sys/src/cmd/cal.c	Tue Mar  2 16:14:40 2010
+++ /sys/src/cmd/cal.c	Tue Mar  2 16:14:37 2010
@@ -166,7 +166,7 @@
 	char *s;
 
 	for(n=0; s=dict[n].word; n++)
-		if(strcmp(s, str) == 0)
+		if(cistrcmp(s, str) == 0)
 			return -dict[n].val;
 	n = 0;
 	s = str;
--- /sys/man/1/cal	Tue Mar  2 16:14:46 2010
+++ /sys/man/1/cal	Tue Mar  2 16:14:43 2010
@@ -14,8 +14,8 @@
 prints a calendar.
 .I Month
 is either a number from 1 to 12,
-a lower case month name,
-or a lower case three-letter prefix of a month name.
+a month name,
+or a three-letter abbreviation of a month name.
 .I Year
 can be between 1
 and 9999.
Binary files cal.0.orig and cal.0 differ