Experimental Physics and
Industrial Control System

Ben Franksen via Tech-talk <tech-talk at aps.anl.gov> · Sat, 13 Mar 2021 11:18:44 +0100

Am 13.03.21 um 10:02 schrieb Ralph Lange via Tech-talk:
> On Sat, 13 Mar 2021 at 00:40, Manoussakis, Adamandios via Tech-talk <
> tech-talk at aps.anl.gov> wrote:
> 
>> It seems like strcmp works when it is placed in an if statement but not as
>> shown below inside the when()
>>
>>
>>
>> *when (strcmp(voltage, "STANDBY")==0) {*
>>
>>             /* turn light on */
>>
>>             light = 8;
>>
>>             pvPut(light);
>>
>>     } state light_on
>>
>> }
>>
> 
> The sequencer reference manual is quite precisely showing what allowed
> expressions are:
> https://www-csr.bessy.de/control/SoftDist/sequencer/Reference.html#expressions
> 
> Other than in C, in State Notation Language (SNL) a function call is not an
> expression.

This is wrong. A function call definitely is an expression and the docs
say so. It may be obscured by the fact that function call is a postfix
operator (not my invention: that's how C defines it).

The posted code should work. If it doesn't then something else is wrong.

Adamandios: what exactly means "does not work"? WHat is the behavior you
see, what do you expected?

Cheers
Ben
-- 
I would rather have questions that cannot be answered, than answers that
cannot be questioned.  -- Richard Feynman

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System