[9fans] rc error messages

[erik quanstrom <quanstro@quanstro.net>]

steve mentioned that rc is not very forthcoming with information on
where runtime errors occur.

here's a little patch that makes rc a little bit more forthcoming.
but it's still pretty useless in the face of functions.

- erik

; diff -c exec.c /n/dump/2008/1021/sys/src/cmd/rc/exec.c
exec.c:887,916 - /n/dump/2008/1021/sys/src/cmd/rc/exec.c:887,898
  }

  void
- hisfault(char *buf, int n)
- {
- 	struct thread *t;
-
- 	for(t = runq; !t->cmdfile; t = t->ret){
- 		if(t->ret == 0)
- 			break;
- 	}
- 	if(t->cmdfile && !t->iflag)
- 		snprint(buf, n, "%s:%d ", t->cmdfile, t->lineno);
- 	else
- 		snprint(buf, n, "");
- }
-
- void
  Xerror(char *s)
  {
- 	char buf[1024];
-
- 	hisfault(buf, sizeof buf);
  	if(strcmp(argv0, "rc")==0 || strcmp(argv0, "/bin/rc")==0)
- 		pfmt(err, "rc: %s%s: %r\n", buf, s);
+ 		pfmt(err, "rc: %s: %r\n", s);
  	else
- 		pfmt(err, "rc (%s): %s%s: %r\n", argv0, buf, s);
+ 		pfmt(err, "rc (%s): %s: %r\n", argv0, s);
  	flush(err);
  	setstatus("error");
  	while(!runq->iflag) Xreturn();
exec.c:919,931 - /n/dump/2008/1021/sys/src/cmd/rc/exec.c:901,910
  void
  Xerror1(char *s)
  {
- 	char buf[1024];
-
- 	hisfault(buf, sizeof buf);
  	if(strcmp(argv0, "rc")==0 || strcmp(argv0, "/bin/rc")==0)
- 		pfmt(err, "rc: %s%s\n", buf, s);
+ 		pfmt(err, "rc: %s\n", s);
  	else
- 		pfmt(err, "rc (%s): %s%s\n", argv0, buf, s);
+ 		pfmt(err, "rc (%s): %s\n", argv0, s);
  	flush(err);
  	setstatus("error");
  	while(!runq->iflag) Xreturn();