Question about r3980 \ VOGONS

Question about r3980

Topic actions

First post, by NewRisingSun

Posted on 2016-04-19, 13:00

NewRisingSun Offline

Rank Oldbie

Rank: Oldbie
Posts: 906
Joined: 2005-09-02, 02:26

I agree that fwrite should have sector_size as the third rather than the second parameter so as not to always return 1, but I don't understand why it makes a difference whether the last action was a read or write for deciding whether fseek is needed or not.

Reply 1 of 1, by Qbix

Posted on 2016-04-19, 13:13

Qbix Offline

Rank DOSBox Author

Rank: DOSBox Author
Posts: 11323
Joined: 2002-11-27, 14:50
Location: Fryslan

from https://www.daemon-systems.org/man/fwrite.3.html

1     Mixing fread() and fwrite() calls without setting the file position
2     explicitly using fsetpos(3) between read and write or write and read
3     operations will lead to unexpected results because of buffering the file
4     pointer not being set to the expected position after each operation
5     completes.  This behavior is allowed by ANSI C for efficiency and it will
6     not be changed.

Water flows down the stream
How to ask questions the smart way!

Go to top of page Go to top of page

Back to DOSBox Development