Import Debian changes 2c0-3debian/2c0-3

slib (2c0-3) unstable; urgency=low

  * New maintainer.
  * slibconfig script to automatically configure guile.
  * Fix type in description, closes: Bug#18996

slib (2c0-2) unstable; urgency=low

  * Minor fix for debian/rules targets

slib (2c0-1) unstable; urgency=low

  * New upstream source
  * New maintainer

1 files changed, 257 insertions, 0 deletions

diff --git a/timezone.scm b/timezone.scm
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--- /dev/null
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+;;;; "timezone.scm" Compute timezones and DST from TZ environment variable.
+;;; Copyright (C) 1994, 1996, 1997 Aubrey Jaffer.
+;
+;Permission to copy this software, to redistribute it, and to use it
+;for any purpose is granted, subject to the following restrictions and
+;understandings.
+;
+;1.  Any copy made of this software must include this copyright notice
+;in full.
+;
+;2.  I have made no warrantee or representation that the operation of
+;this software will be error-free, and I am under no obligation to
+;provide any services, by way of maintenance, update, or otherwise.
+;
+;3.  In conjunction with products arising from the use of this
+;material, there shall be no use of my name in any advertising,
+;promotional, or sales literature without prior written consent in
+;each case.
+
+;; The C-library support for time in general and time-zones in particular
+;; stands as a fine example of how *not* to create interfaces.
+;; 
+;; Functions are not consistently named.  Support for GMT is offered in one
+;; direction only; The localtime function returns some timezone data in the
+;; structure which it returns, and some data in shared global variables.
+;; The structure which localtime returns is overwritten with each
+;; invocation.  There is no way to find local time in zones other than GMT
+;; and the local timezone.
+;; 
+;; The tzfile(5) format encodes only a single timezone per file.  There is
+;; no dispatch on zone names, so multiple copies of a timezone file exist
+;; under different names.  The TZ `:' specification is unix filesystem
+;; specific.  The tzfile(5) format makes no provision for byte-order
+;; differences; It mixes 32-bit integer data with characters; specifying
+;; ASCII bytes, it is incompatible with different character sizes.  The
+;; binary format makes it impossible to easily inspect a file for
+;; corruption.
+;; 
+;; I have corrected most of the failings of the C-library time interface in
+;; SLIB while maintaining compatablility.  I wrote support for Linux
+;; timezone files because on a system where TZ is not set, there is no
+;; other way to reveal this information.  HP-UX appears to have a more
+;; sensible arrangement; I invite you to add support for it and other
+;; platforms.
+;; 
+;; Writing this was a long, tedious, and unenlightening process.  I hope it
+;; is useful.
+;;
+;; Sat Nov 15 00:15:33 1997  Aubrey Jaffer  <jaffer@martigny.ai.mit.edu>
+
+(provide 'time-zone)
+(require 'scanf)
+
+(define daylight? #f)
+(define *timezone* 0)
+(define tzname '#("UTC" "???"))
+
+(define tz:default #f)
+
+;;; Parse Posix TZ string.
+
+(define (string->transition-day-time str)
+  (let ((month 0) (week 0) (day #f) (junk #f))
+    (or (case (sscanf str "J%u%s" day junk)
+	  ((1) (and (<= 1 day 365)
+		    (list #f #f day)))
+	  (else #f))
+	(case (sscanf str "%u%s" day junk)
+	  ((1) (and (<= 0 day 365)
+		    (list #f #t day)))
+	  (else #f))
+	(case (sscanf str "M%u.%u.%u%s" month week day junk)
+	  ((3) (and (<= 1 month 12)
+		    (<= 1 week 5)
+		    (<= 0 day 6)
+		    (list month week day)))
+	  (else #f)))))
+
+(define (string->transition-time str)
+  (let ((date #f) (time "2") (junk #f))
+    (and (or (eqv? 2 (sscanf str "%[JM.0-9]/%[:0-9]%s" date time junk))
+	     (eqv? 1 (sscanf str "%[JM.0-9]" date junk)))
+	 (let ((day (string->transition-day-time date))
+	       (tim (string->time-offset time)))
+	   (and day tim (append day (list tim)))))))
+
+(define (string->time-offset str)
+  (and str (string? str) (positive? (string-length str))
+       (let ((hh #f) (mm 0) (ss 0) (junk #f))
+	 (and (<= 1 (sscanf (if (memv (string-ref str 0) '(#\+ #\-))
+				(substring str 1 (string-length str))
+				str)
+			    "%u:%u:%u%s" hh mm ss junk)
+		  3)
+	      hh (<= 0 hh 23) (<= 0 mm 59) (<= 0 ss 59)
+	      (* (if (char=? #\- (string-ref str 0)) -1 1)
+		 (+ ss (* 60 (+ mm (* hh 60)))))))))
+
+(define (string->time-zone tz)
+  (let ((tzname #f) (offset #f) (dtzname #f) (doffset #f)
+		    (start-str #f) (end-str #f) (junk #f))
+    (define found
+      (sscanf
+       tz "%[^0-9,+-]%[-:+0-9]%[^0-9,+-]%[-:+0-9],%[JM.0-9/:],%[JM.0-9/:]%s"
+       tzname offset dtzname doffset start-str end-str junk))
+    (set! offset (string->time-offset offset))
+    (set! doffset (string->time-offset doffset))
+    (cond
+     ((and offset (eqv? 3 found))
+      (set! doffset (+ -3600 offset))
+      (set! found
+	    (+ 1
+	       (sscanf
+		tz "%[^0-9,+-]%[-:+0-9]%[^0-9,+-],%[JM.0-9/:],%[JM.0-9/:]%s"
+		tzname offset dtzname start-str end-str junk)))
+      (set! offset (string->time-offset offset))))
+    (case found
+      ((2) (vector 'tz:fixed tz tzname offset))
+      ((4) (vector 'tz:rule tz tzname dtzname offset doffset
+		   (list 4 1 0 7200) (list 10 5 0 7200)))
+      ((6) (let ((start (string->transition-time start-str))
+		 (end   (string->transition-time   end-str)))
+	     (and
+	      start end
+	      (vector 'tz:rule tz tzname dtzname offset doffset start end))))
+      (else #f))))
+
+(define (read-tzfile path)
+  (require 'tzfile)
+  (let ((realpath
+	 (cond ((not path) (in-vicinity tzfile:vicinity "localtime"))
+	       ((or (char-alphabetic? (string-ref path 0))
+		    (char-numeric? (string-ref path 0)))
+		(in-vicinity tzfile:vicinity path))
+	       (else path))))
+    (if (file-exists? realpath)
+	(let ((zone (tzfile:read realpath)))
+	  (if zone (list->vector (cons 'tz:file zone))
+	      (slib:error 'read-tzfile realpath)))
+	(slib:error 'read-tzfile "file not found:" realpath)
+	)))
+
+(define (time-zone tz)
+  (cond ((not tz) (read-tzfile #f))
+	((vector? tz) tz)
+	((eqv? #\: (string-ref tz 0))
+	 (read-tzfile (substring tz 1 (string-length tz))))
+	(else (string->time-zone tz))))
+
+;;; Use the timezone
+
+(define (tzrule->caltime year previous-gmt-offset
+			 tr-month tr-week tr-day tr-time)
+  (define leap? (leap-year? year))
+  (define gmmt
+    (time:invert time:gmtime
+		 (vector 0 0 0 1 (if tr-month (+ -1 tr-month) 0) year #f #f 0)))
+  (offset-time
+   gmmt
+   (+ tr-time previous-gmt-offset
+      (* 3600 24
+	 (if tr-month
+	     (let* ((fdow (vector-ref (time:gmtime gmmt) 6)))
+	       (case tr-week
+		 ((1 2 3 4) (+ (modulo (- tr-day fdow) 7)
+			       (* 7 (+ -1 tr-week))))
+		 ((5)
+		  (do ((mmax (vector-ref
+			      (vector-ref time:days/month (if leap? 1 0))
+			      (+ -1 tr-month)))
+		       (d (modulo (- tr-day fdow) 7) (+ 7 d)))
+		      ((>= d mmax) (+ -7 d))))
+		 (else (slib:error 'tzrule->caltime
+				   "week out of range" tr-week))))
+	     (+ tr-day
+		(if (and (not tr-week) (>= tr-day 60) (leap-year? year))
+		    1 0)))))))
+
+(define (tz:params caltime tz)
+  (case (vector-ref tz 0)
+    ((tz:fixed) (list 0 (vector-ref tz 3) (vector-ref tz 2)))
+    ((tz:rule)
+     (let* ((year (vector-ref (time:gmtime caltime) 5))
+	    (ttime0 (apply tzrule->caltime
+			   year (vector-ref tz 4) (vector-ref tz 6)))
+	    (ttime1 (apply tzrule->caltime
+			   year (vector-ref tz 5) (vector-ref tz 7)))
+	    (dst (if (and (not (negative? (difftime caltime ttime0)))
+			  (negative? (difftime caltime ttime1)))
+		     1 0)))
+       (list dst (vector-ref tz (+ 4 dst)) (vector-ref tz (+ 2 dst)))
+       ;;(for-each display (list (gtime ttime0) (gtime caltime) (gtime ttime1)))
+       ))
+    ((tz:file) (let ((zone-spec (tzfile:get-zone-spec caltime tz)))
+		 (list (if (vector-ref zone-spec 2) 1 0)
+		       (- (vector-ref zone-spec 1))
+		       (vector-ref zone-spec 0))))
+    (else (slib:error 'tz:params "unknown timezone type" tz))))
+
+(define (tz:std-offset zone)
+  (case (vector-ref zone 0)
+    ((tz:fixed) (vector-ref zone 3))
+    ((tz:rule) (vector-ref zone 4))
+    ((tz:file)
+     (let ((mode-table (vector-ref zone 2)))
+       (do ((type-idx 0 (+ 1 type-idx)))
+	   ((or (>= type-idx (vector-length mode-table))
+		(not (vector-ref (vector-ref mode-table type-idx) 2)))
+	    (if (>= type-idx (vector-length mode-table))
+		(vector-ref (vector-ref mode-table 0) 1)
+		(- (vector-ref (vector-ref mode-table type-idx) 1)))))))
+    (else (slib:error 'tz:std-offset "unknown timezone type" tz))))
+
+;;; Interpret the TZ envariable.
+(define (tzset . opt-tz)
+  (define tz (if (null? opt-tz)
+		 (getenv "TZ")
+		 (car opt-tz)))
+  (if (or (not tz:default)
+	  (and (string? tz) (not (string-ci=? tz (vector-ref tz:default 1)))))
+      (set! tz:default (or (time-zone tz) '#(tz:fixed "UTC" "GMT" 0))))
+  (case (vector-ref tz:default 0)
+    ((tz:fixed)
+     (set! tzname (vector (vector-ref tz:default 2) "???"))
+     (set! daylight? #f)
+     (set! *timezone* (vector-ref tz:default 3)))
+    ((tz:rule)
+     (set! tzname (vector (vector-ref tz:default 2)
+			  (vector-ref tz:default 3)))
+     (set! daylight? #t)
+     (set! *timezone* (vector-ref tz:default 4)))
+    ((tz:file)
+     (let ((mode-table (vector-ref tz:default 2))
+	   (transition-types (vector-ref tz:default 5)))
+       (set! daylight? #f)
+       (set! *timezone* (vector-ref (vector-ref mode-table 0) 1))
+       (set! tzname (make-vector 2 #f))
+       (do ((type-idx 0 (+ 1 type-idx)))
+	   ((>= type-idx (vector-length mode-table)))
+	 (let ((rec (vector-ref mode-table type-idx)))
+	   (if (vector-ref rec 2)
+	       (set! daylight? #t)
+	       (set! *timezone* (- (vector-ref rec 1))))))
+
+       (do ((transition-idx (+ -1 (vector-length transition-types))
+			    (+ -1 transition-idx)))
+	   ((or (negative? transition-idx)
+		(and (vector-ref tzname 0) (vector-ref tzname 1))))
+	 (let ((rec (vector-ref mode-table
+				(vector-ref transition-types transition-idx))))
+	   (if (vector-ref rec 2)
+	       (if (not (vector-ref tzname 1))
+		   (vector-set! tzname 1 (vector-ref rec 0)))
+	       (if (not (vector-ref tzname 0))
+		   (vector-set! tzname 0 (vector-ref rec 0))))))))
+    (else (slib:error 'tzset "unknown timezone type" tz)))
+  tz:default)