kicad-developers team mailing list archive

[jp charras <jp.charras@xxxxxxxxxx>]

Le 04/12/2016 à 13:46, Michael Steinberg a écrit :
> 
> Am 04.12.2016 um 13:33 schrieb jp charras:
>> It is similar to a string comparison (for string sorting) but unlike the usual strncmp() or
>> strncasecmp() functions, when digits are encountered in a string, they are converted to a number and
>> this is the number value which is taken in account for comparison.
>>
>> This is especially useful to sort component references or value.
>> For instance:
>> when the 2 strings U12 and U2 are compared by ASCII value:
>> In usual comparison (from ASCII value), U120 is sorted before U20
>> In StrNumCmp:
>> 120 is read as a integer value
>> 20  is read as a integer value
>> and comparisons are between U<120> and U<20> where <120> and <20> are integers, not chars.
>>
>> and U120 is sorted after U20
> 
> Hello Jean-Pierre,
> 
> thank you for the information.
> So a numeric character range is to be treated as one character position whose value its the parsed
> number, right?

Right.

> Is the aLength parameter designed to mean raw character counts, or character/number positions? Would
> "U12" compare smaller to "U2" at aLength == 2?


Please consider aLength  as the count of characters to take in account.
(I mean "U12" compare to "U2" at aLength == 2 compare "U1" and "U2")

> Cases like "U12A4A3" vs. "U12A4A4" are also specified where the latter would compare "greater", yes?
> 
> Michael

Yes, although is is a corner case, but it can happens.


-- 
Jean-Pierre CHARRAS