[task #15774] Use libcurl to contact remote servers, not the curl executable

[Mohammad Akhlaghi]

URL:
  <https://savannah.gnu.org/task/?15774>

                 Summary: Use libcurl to contact remote servers, not the curl
executable
                 Project: GNU Astronomy Utilities
            Submitted by: makhlaghi
            Submitted on: Tue 15 Sep 2020 01:02:41 AM BST
         Should Start On: Tue 15 Sep 2020 12:00:00 AM BST
   Should be Finished on: Tue 15 Sep 2020 12:00:00 AM BST
                Category: Query
                Priority: 5 - Normal
              Item Group: Enhancement
                  Status: Postponed
                 Privacy: Public
        Percent Complete: 0%
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                  Effort: 0.00

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Details:

Currently the Query program uses the 'curl' executable (from the 'cURL'
package) to access the remote repositories. But the curl executable requires a
'system' call, that doesn't give us much control over the outcome.

The 'libcurl' library (that also comes with 'cURL') is a much better way to
access the remote servers because control won't leave Gnuastro's programs, and
we can probably have more control over the outputs and errors and etc.

But currently I have no experience with it, if anyone reading this is familiar
with libcurl and has time, it would be great if you can complete this task
;-). 




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