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upas/marshal: make attachment failure fatal

--- a/sys/src/cmd/upas/marshal/marshal.c

+++ b/sys/src/cmd/upas/marshal/marshal.c

@@ -136,6 +136,7 @@

 char *login;

 Alias *aliases;

 int rfc822syntaxerror;

+int attachfailed;

 char lastchar;

 char *replymsg;

@@ -308,6 +309,10 @@

 		holding = holdon();

 		headersrv = readheaders(&in, &flags, &hdrstring,

 			eightflag? &to: nil, eightflag? &cc: nil, eightflag? &bcc: nil, l, 1);

+		if(attachfailed){

+			Bdrain(&in);

+			fatal("attachment(s) failed, message not sent");

+		}

 		if(rfc822syntaxerror){

 			Bdrain(&in);

 			fatal("rfc822 syntax error, message not sent");

@@ -501,8 +506,11 @@

 				if(att == nil)

 					break;

 				*att = mkattach(hdrval(s_to_c(sline)), nil, hdrtype == Hinclude);

-				if(*att != nil)

-					att = &(*att)->next;

+				if(*att == nil){

+					attachfailed = 1;

+					return Error;

+				}

+				att = &(*att)->next;

 				break;

 			}

 			s_free(sline);