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upas: appendfolder(): skip the address from unix header before date

--- a/sys/src/cmd/upas/common/folder.c

+++ b/sys/src/cmd/upas/common/folder.c

@@ -186,8 +186,8 @@

 int

 appendfolder(Biobuf *b, char *addr, int fd)

 {

-	char *s;

-	int r, n;

+	char *s, *t;

+	int r;

 	Biobuf bin;

 	Folder *f;

 	Tm tm;

@@ -196,10 +196,11 @@

 	Bseek(f->out, 0, 2);

 	Binit(&bin, fd, OREAD);

 	s = Brdstr(&bin, '\n', 0);

-	n = strlen(s);

-	if(!s || strncmp(s, "From ", 5) != 0)

+	if(s == nil || strncmp(s, "From ", 5) != 0)

 		Bprint(f->out, "From %s %.28s\n", addr, ctime(f->t));

-	else if(n > 5 && tmparse(&tm, Ctimefmt, s + 5, nil, nil) != nil)

+	else if(strncmp(s, "From ", 5) == 0 

+		&& (t = strchr(s + 5, ' ')) != nil

+		&& tmparse(&tm, Ctimefmt, t + 1, nil, nil) != nil)

 		f->t = tm2sec(&tm);

 	if(s)

 		Bwrite(f->out, s, strlen(s));