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upas/fs: remove unused function date822tounix

--- a/sys/src/cmd/upas/fs/dat.h

+++ b/sys/src/cmd/upas/fs/dat.h

@@ -238,7 +238,6 @@

 void		parse(Mailbox*, Message*, int, int);

 void		parseheaders(Mailbox*, Message*, int, int);

 void		parsebody(Message*, Mailbox*);

-char*		date822tounix(Message*, char*);

 int		strtotm(char*, Tm*);

 char*		lowercase(char*);

--- a/sys/src/cmd/upas/fs/mbox.c

+++ b/sys/src/cmd/upas/fs/mbox.c

@@ -1676,28 +1676,3 @@

 	syslog(Sflag, logf, "%s", buf);

 	fprint(2, "%s", buf2);

 }

-

-/*

- *  convert an RFC822 date into a Unix style date

- *  for when the Unix From line isn't there (e.g. POP3).

- *  enough client programs depend on having a Unix date

- *  that it's easiest to write this conversion code once, right here.

- *

- *  people don't follow RFC822 particularly closely,

- *  so we use strtotm, which is a bunch of heuristics.

- */

-

-char*

-date822tounix(Message *, char *s)

-{

-	char *p, *q;

-	Tm tm;

-

-	if(strtotm(s, &tm) < 0)

-		return nil;

-

-	p = asctime(&tm);

-	if(q = strchr(p, '\n'))

-		*q = '\0';

-	return strdup(p);

-}