SWI-Prolog -- API-function PL_STRINGS

Documentation
- Reference manual
  - Foreign Language Interface
    - The Foreign Include File
      - String buffering
        
        PL_STRINGS_MARK()
        
        PL_STRINGS_RELEASE()
- Packages

Availability:C-language interface function

void PL_STRINGS_MARK()

void PL_STRINGS_RELEASE()

These macros must be paired and create a C block ({...}). Any string created using BUF_STACK after PL_STRINGS_MARK() is released by the corresponding PL_STRINGS_RELEASE(). These macros should be used like below. Note that strings returned by any of the Prolog functions between this pair may be invalidated.

  ...
  PL_STRINGS_MARK();
    <operations involving strings>
  PL_STRINGS_RELEASE();
  ...