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+/* ========================================================================
+ * Copyright 1988-2006 University of Washington
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 
+ * ========================================================================
+ */
+
+/*
+ * Program:	UNIX mail routines
+ *
+ * Author:	Mark Crispin
+ *		Networks and Distributed Computing
+ *		Computing & Communications
+ *		University of Washington
+ *		Administration Building, AG-44
+ *		Seattle, WA  98195
+ *		Internet: MRC@CAC.Washington.EDU
+ *
+ * Date:	20 December 1989
+ * Last Edited:	30 August 2006
+ */
+
+
+/*				DEDICATION
+ *
+ *  This file is dedicated to my dog, Unix, also known as Yun-chan and
+ * Unix J. Terwilliker Jehosophat Aloysius Monstrosity Animal Beast.  Unix
+ * passed away at the age of 11 1/2 on September 14, 1996, 12:18 PM PDT, after
+ * a two-month bout with cirrhosis of the liver.
+ *
+ *  He was a dear friend, and I miss him terribly.
+ *
+ *  Lift a leg, Yunie.  Luv ya forever!!!!
+ */
+
+/* Validate line
+ * Accepts: pointer to candidate string to validate as a From header
+ *	    return pointer to end of date/time field
+ *	    return pointer to offset from t of time (hours of ``mmm dd hh:mm'')
+ *	    return pointer to offset from t of time zone (if non-zero)
+ * Returns: t,ti,zn set if valid From string, else ti is NIL
+ */
+
+#define VALID(s,x,ti,zn) {						\
+  ti = 0;								\
+  if ((*s == 'F') && (s[1] == 'r') && (s[2] == 'o') && (s[3] == 'm') &&	\
+      (s[4] == ' ')) {							\
+    for (x = s + 5; *x && *x != '\012'; x++);				\
+    if (*x) {								\
+      if (x[-1] == '\015') --x;						\
+      if (x - s >= 41) {						\
+	for (zn = -1; x[zn] != ' '; zn--);				\
+	if ((x[zn-1] == 'm') && (x[zn-2] == 'o') && (x[zn-3] == 'r') &&	\
+	    (x[zn-4] == 'f') && (x[zn-5] == ' ') && (x[zn-6] == 'e') &&	\
+	    (x[zn-7] == 't') && (x[zn-8] == 'o') && (x[zn-9] == 'm') &&	\
+	    (x[zn-10] == 'e') && (x[zn-11] == 'r') && (x[zn-12] == ' '))\
+	  x += zn - 12;							\
+      }									\
+      if (x - s >= 27) {						\
+	if (x[-5] == ' ') {						\
+	  if (x[-8] == ':') zn = 0,ti = -5;				\
+	  else if (x[-9] == ' ') ti = zn = -9;				\
+	  else if ((x[-11] == ' ') && ((x[-10]=='+') || (x[-10]=='-')))	\
+	    ti = zn = -11;						\
+	}								\
+	else if (x[-4] == ' ') {					\
+	  if (x[-9] == ' ') zn = -4,ti = -9;				\
+	}								\
+	else if (x[-6] == ' ') {					\
+	  if ((x[-11] == ' ') && ((x[-5] == '+') || (x[-5] == '-')))	\
+	    zn = -6,ti = -11;						\
+	}								\
+	if (ti && !((x[ti - 3] == ':') &&				\
+		    (x[ti -= ((x[ti - 6] == ':') ? 9 : 6)] == ' ') &&	\
+		    (x[ti - 3] == ' ') && (x[ti - 7] == ' ') &&		\
+		    (x[ti - 11] == ' '))) ti = 0;			\
+      }									\
+    }									\
+  }									\
+}
+
+/* You are not expected to understand this macro, but read the next page if
+ * you are not faint of heart.
+ *
+ * Known formats to the VALID macro are:
+ *		From user Wed Dec  2 05:53 1992
+ * BSD		From user Wed Dec  2 05:53:22 1992
+ * SysV		From user Wed Dec  2 05:53 PST 1992
+ * rn		From user Wed Dec  2 05:53:22 PST 1992
+ *		From user Wed Dec  2 05:53 -0700 1992
+ * emacs	From user Wed Dec  2 05:53:22 -0700 1992
+ *		From user Wed Dec  2 05:53 1992 PST
+ *		From user Wed Dec  2 05:53:22 1992 PST
+ *		From user Wed Dec  2 05:53 1992 -0700
+ * Solaris	From user Wed Dec  2 05:53:22 1992 -0700
+ *
+ * Plus all of the above with `` remote from xxx'' after it. Thank you very
+ * much, smail and Solaris, for making my life considerably more complicated.
+ */
+
+/*
+ * What?  You want to understand the VALID macro anyway?  Alright, since you
+ * insist.  Actually, it isn't really all that difficult, provided that you
+ * take it step by step.
+ *
+ * Line 1	Initializes the return ti value to failure (0);
+ * Lines 2-3	Validates that the 1st-5th characters are ``From ''.
+ * Lines 4-6	Validates that there is an end of line and points x at it.
+ * Lines 7-14	First checks to see if the line is at least 41 characters long.
+ *		If so, it scans backwards to find the rightmost space.  From
+ *		that point, it scans backwards to see if the string matches
+ *		`` remote from''.  If so, it sets x to point to the space at
+ *		the start of the string.
+ * Line 15	Makes sure that there are at least 27 characters in the line.
+ * Lines 16-21	Checks if the date/time ends with the year (there is a space
+ *		five characters back).  If there is a colon three characters
+ *		further back, there is no timezone field, so zn is set to 0
+ *		and ti is set in front of the year.  Otherwise, there must
+ *		either to be a space four characters back for a three-letter
+ *		timezone, or a space six characters back followed by a + or -
+ *		for a numeric timezone; in either case, zn and ti become the
+ *		offset of the space immediately before it.
+ * Lines 22-24	Are the failure case for line 14.  If there is a space four
+ *		characters back, it is a three-letter timezone; there must be a
+ *		space for the year nine characters back.  zn is the zone
+ *		offset; ti is the offset of the space.
+ * Lines 25-28	Are the failure case for line 20.  If there is a space six
+ *		characters back, it is a numeric timezone; there must be a
+ *		space eleven characters back and a + or - five characters back.
+ *		zn is the zone offset; ti is the offset of the space.
+ * Line 29-32	If ti is valid, make sure that the string before ti is of the
+ *		form www mmm dd hh:mm or www mmm dd hh:mm:ss, otherwise
+ *		invalidate ti.  There must be a colon three characters back
+ *		and a space six or nine	characters back (depending upon
+ *		whether or not the character six characters back is a colon).
+ *		There must be a space three characters further back (in front
+ *		of the day), one seven characters back (in front of the month),
+ *		and one eleven characters back (in front of the day of week).
+ *		ti is set to be the offset of the space before the time.
+ *
+ * Why a macro?  It gets invoked a *lot* in a tight loop.  On some of the
+ * newer pipelined machines it is faster being open-coded than it would be if
+ * subroutines are called.
+ *
+ * Why does it scan backwards from the end of the line, instead of doing the
+ * much easier forward scan?  There is no deterministic way to parse the
+ * ``user'' field, because it may contain unquoted spaces!  Yes, I tested it to
+ * see if unquoted spaces were possible.  They are, and I've encountered enough
+ * evil mail to be totally unwilling to trust that ``it will never happen''.
+ */
+
+/* Build parameters */
+
+#define KODRETRY 15		/* kiss-of-death retry in seconds */
+#define LOCKTIMEOUT 5		/* lock timeout in minutes */