taskGNU Astronomy Utilities - Tasks: task #16114, Print warning where integer...

 
 

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task #16114: Print warning where integer overflow happens

Submitter:  Pedram Ashofteh Ardakani <pedram>
Submitted:  Tue 01 Feb 2022 10:31:18 AM UTC
 
Should Start On:  Tue 01 Feb 2022 12:00:00 AM UTC Should be Finished on:  Tue 01 Feb 2022 12:00:00 AM UTC
Category:  Arithmetic Priority:  5 - Normal
Item Group:  Enhancement Status:  None
Privacy:  Public Percent Complete:  0%
Assigned to:  tushar_gupta Open/Closed:  Open
Effort:  0.00

Sun 22 May 2022 01:07:55 PM UTC, comment #3: 

Have you made any progress on this Tushar?

Mohammad Akhlaghi <makhlaghi>
Project Administrator
Fri 11 Mar 2022 10:20:37 AM UTC, comment #2: 

This is a good bug you chose Tashar! Its all yours ;-).

Mohammad Akhlaghi <makhlaghi>
Project Administrator
Fri 11 Mar 2022 08:05:32 AM UTC, comment #1: 

I went to this error and want to fix it . Could you please assign this task to me.
Thank you

Tushar Gupta <tushar_gupta>
Project Member
Tue 01 Feb 2022 10:31:18 AM UTC, original submission:  

As explained in bug #61969 , arithmetic reads inputs and uses the smallest numerical data type possible to compute more efficiently with the least amount of memory. However, the user might not be aware of the integer overflow that might happen when calculations result in values that need larger storage types. For example:

$ astarithmetic 254 2 +
0

This happens because 254 and 2 are both of type uint8 that can store a maximum value of 255, so instead of getting the expected result 256, we'd get 0 as the result of an integer overflow. One way to work around this for now is to use floating points in the inputs, for instance:

$ astarithmetic 254.0 2 +
256

Since this is happening silently, we need to at least print a warning to notify the user of the circumstances. So this task is defined here as Mohammad pointed out in bug #61969:

> C library's 'errno.h' has a special error code for such range overflows: 'ERANGE'. We should add a check for this error code within arithmetic and if it happens, a warning should be printed that an overflow has happened (to standard-error; so its even printed with '--quiet'!).

Pedram Ashofteh Ardakani <pedram>
Project Member

 

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    Follow 2 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2022-03-11 makhlaghi Assigned toNone tushar_gupta
    2022-02-01 pedram Carbon-Copy- Added makhlaghi

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