Re: Random Access I/O
On Saturday, 26 March 2016 at 00:10:23 UTC, Chris Williams wrote: None of the access modes for std.stdio.File seem to allow that. Any usage of the "w" mode causes my code to consider the file empty if it pre-exists (though, it doesn't always actually truncate the disk on file?) Mode "a+" or "r+" for append+read or read+write will do it, same as in C. If I was coding in C, I would use open() as it gives more options for access: This function is in `import core.sys.posix.fcntl;` (the documentation is lax on this but generally when you see a Posix function in C that is #include, you can get it in D with `import core.sys.posix.X`.
Re: Random Access I/O
On Saturday, 26 March 2016 at 00:10:23 UTC, Chris Williams wrote: I need to be able to perform random access I/O against a file, creating a new file if it doesn't exist, or opening as-is (no truncation) if it already exists. None of the access modes for std.stdio.File seem to allow that. Any usage of the "w" mode causes my code to consider the file empty if it pre-exists (though, it doesn't always actually truncate the disk on file?) If I was coding in C, I would use open() as it gives more options for access: http://pubs.opengroup.org/onlinepubs/009695399/functions/open.html However, I don't see this exposed in phobos anywhere? The Programming in D book chapter on Files http://ddili.org/ders/d.en/files.html will help. I think the "std.stdio.File struct" section on the same page has what you need. Also, take a look at http://dlang.org/phobos/std_stdio.html#.File.open.
Random Access I/O
I need to be able to perform random access I/O against a file, creating a new file if it doesn't exist, or opening as-is (no truncation) if it already exists. None of the access modes for std.stdio.File seem to allow that. Any usage of the "w" mode causes my code to consider the file empty if it pre-exists (though, it doesn't always actually truncate the disk on file?) If I was coding in C, I would use open() as it gives more options for access: http://pubs.opengroup.org/onlinepubs/009695399/functions/open.html However, I don't see this exposed in phobos anywhere?