X-Git-Url: http://git.kpe.io/?p=kmrcl.git;a=blobdiff_plain;f=io.lisp;h=61298add617fceb73802eaba82e48457f7dd411b;hp=db94854156e6dbd0bae9052a5e14746bb9857f7b;hb=e9927af19ebf762b2311f296643c00e3aa9cbb00;hpb=e4718cf4751ba0ca9029e30f40b28d17305ed7c3

diff --git a/io.lisp b/io.lisp
index db94854..61298ad 100644
--- a/io.lisp
+++ b/io.lisp
@@ -219,4 +219,111 @@
 	    (list root)
 	    (error "root not directory ~A" root)))))
 
-  
+
+(defmacro with-utime-decoding ((utime &optional zone) &body body)
+  "UTIME is a universal-time, ZONE is a number of hours offset from UTC, or NIL to use local time.  Execute BODY in an environment where SECOND MINUTE HOUR DAY-OF-MONTH MONTH YEAR DAY-OF-WEEK DAYLIGHT-P ZONE are bound to the decoded components of the universal time"
+  `(multiple-value-bind
+       (second minute hour day-of-month month year day-of-week daylight-p zone)
+       (decode-universal-time ,utime ,@(if zone (list zone)))
+     (declare (ignorable second minute hour day-of-month month year day-of-week daylight-p zone))
+     ,@body))
+
+(defvar +datetime-number-strings+ 
+  (make-array 61 :adjustable nil :element-type 'string :fill-pointer nil
+	      :initial-contents 
+	      '("00" "01" "02" "03" "04" "05" "06" "07" "08" "09" "10" "11"
+		"12" "13" "14" "15" "16" "17" "18" "19" "20" "21" "22" "23"
+		"24" "25" "26" "27" "28" "29" "30" "31"	"32" "33" "34" "35"
+		"36" "37" "38" "39" "40" "41" "42" "43" "44" "45" "46" "47"
+		"48" "49" "50" "51" "52" "53" "54" "55" "56" "57" "58" "59"
+		"60")))
+
+(defun is-dst (utime)
+  (with-utime-decoding (utime)
+    daylight-p))
+
+
+(defmacro with-utime-decoding-utc-offset ((utime utc-offset) &body body)
+  (with-gensyms (zone)
+    `(let* ((,zone (cond
+		    ((eq :utc ,utc-offset) 
+		     0)
+		    ((null utc-offset)
+		     nil)
+		    (t
+		     (if (is-dst ,utime)
+			 (1- (- ,utc-offset))
+		       (- ,utc-offset))))))
+       (if ,zone
+	   (with-utime-decoding (,utime ,zone)
+	     ,@body)
+	 (with-utime-decoding (,utime)
+	   ,@body)))))
+
+
+(defun write-utime-hms (utime &key utc-offset stream)
+  (if stream
+      (write-utime-hms-stream utime stream utc-offset)
+    (with-output-to-string (s)
+      (write-utime-hms-stream utime s utc-offset))))
+
+(defun write-utime-hms-stream (utime stream &optional utc-offset)
+  (with-utime-decoding-utc-offset (utime utc-offset)
+    (write-string (aref +datetime-number-strings+ hour) stream)
+    (write-char #\: stream)
+    (write-string (aref +datetime-number-strings+ minute) stream)
+    (write-char #\: stream)
+    (write-string (aref +datetime-number-strings+ second) stream)))
+
+(defun write-utime-hm (utime &key utc-offset stream)
+  (if stream
+      (write-utime-hm-stream utime stream utc-offset)
+    (with-output-to-string (s)
+      (write-utime-hm-stream utime s utc-offset))))
+
+(defun write-utime-hm-stream (utime stream &optional utc-offset)
+  (with-utime-decoding-utc-offset (utime utc-offset)
+    (write-string (aref +datetime-number-strings+ hour) stream)
+    (write-char #\: stream)
+    (write-string (aref +datetime-number-strings+ minute) stream)))
+
+
+(defun write-utime-ymdhms (utime &key stream utc-offset)
+  (if stream
+      (write-utime-ymdhms-stream utime stream utc-offset)
+    (with-output-to-string (s)
+      (write-utime-ymdhms-stream utime s utc-offset))))
+
+(defun write-utime-ymdhms-stream (utime stream &optional utc-offset)
+  (with-utime-decoding-utc-offset (utime utc-offset)
+    (write-string (prefixed-fixnum-string year nil 4) stream)
+    (write-char #\/ stream)
+    (write-string (aref +datetime-number-strings+ month) stream)
+    (write-char #\/ stream)
+    (write-string (aref +datetime-number-strings+ day-of-month) stream)
+    (write-char #\space stream)
+    (write-string (aref +datetime-number-strings+ hour) stream)
+    (write-char #\: stream)
+    (write-string (aref +datetime-number-strings+ minute) stream)
+    (write-char #\: stream)
+    (write-string (aref +datetime-number-strings+ second) stream)))
+
+(defun write-utime-ymdhm (utime &key stream utc-offset)
+  (if stream
+      (write-utime-ymdhm-stream utime stream utc-offset)
+    (with-output-to-string (s)
+      (write-utime-ymdhm-stream utime s utc-offset))))
+
+(defun write-utime-ymdhm-stream (utime stream &optional utc-offset)
+  (with-utime-decoding-utc-offset (utime utc-offset)
+    (write-string (prefixed-fixnum-string year nil 4) stream)
+    (write-char #\/ stream)
+    (write-string (aref +datetime-number-strings+ month) stream)
+    (write-char #\/ stream)
+    (write-string (aref +datetime-number-strings+ day-of-month) stream)
+    (write-char #\space stream)
+    (write-string (aref +datetime-number-strings+ hour) stream)
+    (write-char #\: stream)
+    (write-string (aref +datetime-number-strings+ minute) stream)))
+
+