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- From: dmak@dworkin.ccs.northeastern.edu (Dave Mak)
- Subject: AmigaDOS vs. ANSI SAS implementation [Was Re: SAS C6.1 datecmp bug]
- In-Reply-To: walker@twix.unx.sas.com's message of Tue, 22 Dec 1992 13: 50:04 GMT
- Message-ID: <DMAK.92Dec25000536@dec5120a.ccs.northeastern.edu>
- Sender: news@random.ccs.northeastern.edu
- Nntp-Posting-Host: dec5120a.ccs.northeastern.edu
- Reply-To: dmak@dworkin.ccs.northeastern.edu
- Organization: College of Computer Science, Northeastern University
- References: <BzD93n.JCo@usenet.ucs.indiana.edu> <BzEqDF.A5H@unx.sas.com>
- <1992Dec21.030843.16107@bohra.cpg.oz.au> <BzMJJB.84z@unx.sas.com>
- <BznyFH.J3s@unx.sas.com>
- Date: Fri, 25 Dec 1992 05:05:36 GMT
- Lines: 73
-
- In article <BznyFH.J3s@unx.sas.com> walker@twix.unx.sas.com (Doug Walker) writes:
-
- >In article <BzMJJB.84z@unx.sas.com>, jamie@cdevil.unx.sas.com (James Cooper) writes:
- >|> Doug was correct. Out of all those people, things can still slip past... for
- >|> instance, one of the things fixed in 6.1 over 6.0 was not being able to compile
- >|> with the F4 key in SE. This was finally traced down to having the system
- >|> WildStar bit turned on. You might claim this is a common thing to do, but none
- >|> of the Beta testers uses that bit, so it wasn't found until after release.
-
- >...or if they do, they don't use SE, or if they do, they don't compile
- >using F4, or if they do, they shrugged their shoulders when it happened
- >and used right-Amiga-B instead.
-
- >|> As for why it was broken when you got it... well, I don't know any programmers
- >|> who use the ANSI functions unless they are porting code, and we've only had 3
- >|> people complain about the datecmp() function so far... and all of the complaints
- >|> were *after* 6.1 came out. The function was there in 6.0, and hasn't been
- >|> touched since, but we never knew there was a problem, so we couldn't fix it.
-
- >Huh? Many, many people use the ANSI functions. datecmp() is not an
- >ANSI function, however, it's an AmigaDOS function. This is probably
- >why it got by unnoticed.
-
- Some people seem to be getting difftime and datecmp (two different functions)
- confused, but this leads me to another question:
-
- Forgive me if this shows off my ignorance in compiler design, but I'm curious
- as to which routines are better performance wise. AmigaDOS or their ANSI
- equivalents? Case in point: ANSI time routines vs. AmigaDOS stuff. Is it a
- simple programmer preference (portability bet. diff. systems vs. portability
- bet. diff. Amiga compilers?) or are their performance differences?
-
- Does clock() {ANSI} return a value based on the hardware clock less accurately
- than the timer() {AmigaDOS} ignoring their return type differences?
-
- >The bug was a simple = vs == typo in datecmp(). I have fixed it and
- >the fix will be in 6.2. I suggest coding a datecmp() yourself,
- >it's pretty obvious how it has to work. In fact, here it is:
-
- >(Actually, assuming the fields in the DateStamp structure can
- >never be negative, you could use a simple memcmp() on it...
- >hmmm....)
-
- Is this a hint on how you might optimize functions that do this?
-
- >Right now, 6.2 is being held pending discovery of a weird memory-
- >trashing bug on '040 machines that was introduced after 6.1 was
- >shipped. I apologize for the delay; I'd love to be able to ship
- >it right now, but until we locate this problem, we can't ship
- >anything.
-
- Just wanted to add my $.02 worth re: SAS/C v6.x. After receiving version 6.0
- in the mail as an upgrade, I was really impressed by the professional quality
- of the package. Admittedly, a lot of the major changes (ie: better Workbench
- interface) was in 5.10b, but the new context sensitive help, EMITS tech.
- support and performance improvements brings the premier Ami. C devel. package
- just C++ shy from Borland C Pro. -- The top C devel. system for
- MS-DOS/Windows.
-
-
- >--
- > *****
- >=*|_o_o|\\=====Doug Walker, Software Distiller====== BBS: (919)460-7430 =
- > *|. o.| || 1200/2400/9600 Dual
- > | o |// For all you do, this bug's for you!
- > ======
- >usenet: walker@unx.sas.com bix: djwalker
- >Any opinions expressed are mine, not those of SAS Institute, Inc.
-
- --
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