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Re: built-in printf %f parameter format depend on LC_NUMERIC


From: Chet Ramey
Subject: Re: built-in printf %f parameter format depend on LC_NUMERIC
Date: Tue, 9 Jul 2019 14:28:09 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.2

On 7/9/19 11:26 AM, address@hidden wrote:

> Bash Version: 5.0
> Patch Level: 3
> Release Status: release
> 
> Description:
>         When formatting floating point numbers in Bash's built-in 
>         printf with %s, the argument format depends on the LC_NUMERIC
>         environment variable.

As POSIX requires:

http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap07.html#tag_07_03_04

The `decimal_point' member of the LC_NUMERIC category defines the radix
character in floating point numbers, for both input and output.

>         If the LC_NUMERIC language defines a comma , as decimal 
>         separator, the built-in printf will not be able to recognize 
>         floating-point numbers using a decimal point . as it is when 
>         using the result of bc

This depends on the behavior of strtold/strtod. POSIX requires strtod to
honor the radix character as defined in LC_NUMERIC. Since LC_NUMERIC
determines the radix character for input and output, it looks like `bc'
is not POSIX conformant.

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    address@hidden    http://tiswww.cwru.edu/~chet/



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