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trust: make filesystem path construction flexible

Daiki Ueno requested to merge dueno/gnutls:wip/dueno/ca-path into master

To handle pathnames longer than the fixed length (previously 256), this adds a set of internal API functions around the gnutls_pathbuf_st struct, which enables to safely and efficiently construct pathnames. The new API initially uses the statically allocated buffer and starts allocating memory on heap only after the limit has reached.

Fixes: #1280 (closed)

Checklist

  • Commits have Signed-off-by: with name/author being identical to the commit author
  • Code modified for feature
  • Test suite updated with functionality tests
  • Test suite updated with negative tests
  • Documentation updated / NEWS entry present (for non-trivial changes)
  • CI timeout is 2h or higher (see Settings/CICD/General pipelines/Timeout)

Reviewer's checklist:

  • Any issues marked for closing are addressed
  • There is a test suite reasonably covering new functionality or modifications
  • Function naming, parameters, return values, types, etc., are consistent and according to CONTRIBUTION.md
  • This feature/change has adequate documentation added
  • No obvious mistakes in the code
Edited by Daiki Ueno

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