[OSSIM] ossimString C-local conversion patch

[Stéphane A. <otb...@gm...>]

Hello,

I'm developer on the OTB project (https://www.orfeo-toolbox.org/) which
uses OSSIM and runs on some Linux/Windows/OSX non-english systems (such as
fr_FR.UTF-8). Those systems use the comma ',' as decimal point as opposed
to the POSIX dot '.' decimal separator.

However, the product meta-data always use the point '.' decimal separator
and the ossimString class always considers the system locale (on a French
system the decimal separator will be the comma ','). So, there are some
issues regarding conversion of meta-data values on our target platforms. As
for an example a '1.5' string would be converted to a 1 numerical value.

Please find enclosed a patch I started but remains unfinished and untested
which consists in:

   1. adding a useCLocal force flag to all string-numerical conversion
   functions of the ossimString
   2. use the std::istringstream.imbue( std::locale::classic() ) to do that
   3. also include some ossimString private template functions to factorize
   some code
   4. use the useCLocale everywhere in the OSSIM library were meta-data
   string-value conversion occurs and let other use of the ossimString class
   choose to use the system or C/POSIX locale.

The OTB PSC and developer team would like to know if the people of the
OSSIM project would be interested in including such a a patch in future
OSSIM releases.

Best regards,

http://orfeo-toolbox.org

Stéphane ALBERT
Ingénieur d'études et développement
Business Unit E-SPACE & Geo Information, Département APPLICATIONS

CS Systèmes d'Information
Parc de la Grande Plaine - 5, Rue Brindejonc des Moulinais - BP 15872
31506 Toulouse Cedex 05 - France