[Info-vax] C limitations, was: Re: VMS process communication

[Dan Cross]

In article <kakrvrFq0fdU9 at mid.individual.net>,
bill  <bill.gunshannon at gmail.com> wrote:
>On 4/23/2023 9:54 AM, Bob Eager wrote:
>> On Sun, 23 Apr 2023 09:51:11 -0400, Arne Vajhøj wrote:
>> 
>>> On 4/23/2023 9:46 AM, bill wrote:
>>>> On 4/22/2023 7:47 PM, Arne Vajhøj wrote:
>>>>> True. In C the isdigit function would be much better than a range
>>>>> check.
>>>>
>>>> A cute idea, but also a modern accretion. Early C didn't have it and as
>>>> much as people like to say comparing a char to it's numeric value is
>>>> not a good idea it was quite common at one time.  I know,
>>>> because I was the one tasked with porting some of this code to Primix
>>>> where the chars all had a different numeric value.  I don't know why
>>>> they did it, but they did.
>>>
>>> Different people may have different definitions of "modern".
>>>
>>> isdigit is in C89 so it has been standard for over 30 years.
>> 
>> It's in the original K&R book, so that's back as far as 1978. Hardly a
>> 'modern accretion'!
>
>It is not in Ultrix-11 :-).  I assume that also means V7.

It is certainly in V7 and is referenced all over Ultrix-11,
though curiously, `ctype.h` seems to be missing from the archive
I have of that.  However, it's in v7m.

>Don't remember it in System III.

It was definitely in System III.

> Don't know when it came
>about but I was already trying to port a lot of Univ C
>programs by 1982.  A bit before C89.

That's very odd.  Was that some kind of micro?

	- Dan C.