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computers / comp.sys.unisys / Re: 2200 UCS C Question

SubjectAuthor
* 2200 UCS C QuestionKira Ash
`* Re: 2200 UCS C QuestionAndrew
 `- Re: 2200 UCS C QuestionKira Ash

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2200 UCS C Question

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Subject: 2200 UCS C Question
From: hpeinteg...@gmail.com (Kira Ash)
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 by: Kira Ash - Thu, 8 Sep 2022 16:44 UTC

Hi all,

I'm fairly new to the OS 2200 environment. I noticed that when I invoke newly compiled UCS C programs with @XQT, access to stdin works as expected - the user is prompted for input by getchar(), for instance. However, when invoking the program directly (via @programname), the program immediately completes without prompting for input, and garbage is present in the input buffers. I'm probably missing something obvious, but I would very much appreciate any suggestions as to why this is!!

Kira

Re: 2200 UCS C Question

<tfddfl$nh9$1@gioia.aioe.org>

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From: Dou...@hyperspace.vogon.gov (Andrew)
Newsgroups: comp.sys.unisys
Subject: Re: 2200 UCS C Question
Date: Thu, 8 Sep 2022 20:49:25 +0200
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 by: Andrew - Thu, 8 Sep 2022 18:49 UTC

Kira Ash wrote:
> Hi all,
>
> I'm fairly new to the OS 2200 environment. I noticed that when I invoke newly compiled UCS C programs with @XQT, access to stdin works as expected - the user is prompted for input by getchar(), for instance. However, when invoking the program directly (via @programname), the program immediately completes without prompting for input, and garbage is present in the input buffers. I'm probably missing something obvious, but I would very much appreciate any suggestions as to why this is!!
>
> Kira
>

If you call a program as a processor, the first thing you get to read is
the fields on the processor call. As an example,
@UC,opts file.input-elt,file2.output-om
The normal procedure is to call RINF$ (SYSLIB) to move all this
information to an internal buffer, RINF$ uses some form of ER READ$ or
ER SYMB$ to do this. Once you have read the command line you can start
using getchar() normally.

If you call a program using @xqt you don't have anything RINF$
understands so you can move straight to user-input.

Re: 2200 UCS C Question

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Subject: Re: 2200 UCS C Question
From: hpeinteg...@gmail.com (Kira Ash)
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 by: Kira Ash - Thu, 8 Sep 2022 19:23 UTC

On Thursday, September 8, 2022 at 11:49:32 AM UTC-7, Andrew wrote:
> Kira Ash wrote:
> > Hi all,
> >
> > I'm fairly new to the OS 2200 environment. I noticed that when I invoke newly compiled UCS C programs with @XQT, access to stdin works as expected - the user is prompted for input by getchar(), for instance. However, when invoking the program directly (via @programname), the program immediately completes without prompting for input, and garbage is present in the input buffers. I'm probably missing something obvious, but I would very much appreciate any suggestions as to why this is!!
> >
> > Kira
> >
> If you call a program as a processor, the first thing you get to read is
> the fields on the processor call. As an example,
> @UC,opts file.input-elt,file2.output-om
> The normal procedure is to call RINF$ (SYSLIB) to move all this
> information to an internal buffer, RINF$ uses some form of ER READ$ or
> ER SYMB$ to do this. Once you have read the command line you can start
> using getchar() normally.
>
> If you call a program using @xqt you don't have anything RINF$
> understands so you can move straight to user-input.

Thank you so much! That explains it.

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