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ios: add "writeonly" field

--- a/src/ios.c

+++ b/src/ios.c

@@ -656,6 +656,11 @@

 static usize

 ios_copy_(sl_ios *to, sl_ios *from, usize nbytes, bool all)

 {

+	// FIXME(sigrid): ios doesn't really care about errors

+	// this needs a big fix everywhere

+	if(to->readonly || from->writeonly)

+		return 0;

+

 	usize total = 0, avail;

 	if(!ios_eof(from)){

 		do{

@@ -761,8 +766,10 @@

 	s = ios_fd(s, fd, 1, 1);

 	if(fd < 0)

 		goto open_file_err;

-	if(!wr)

+	if(!wr && rd)

 		s->readonly = true;

+	if(wr && !rd)

+		s->writeonly = true;

 	s->loc.filename = MEM_STRDUP(fname);

 	return s;

 open_file_err:

--- a/src/ios.h

+++ b/src/ios.h

@@ -43,6 +43,7 @@

 	int fd;

 	bool readonly;

+	bool writeonly;

 	bool ownbuf;

 	bool ownfd;

 	bool _eof;