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gawk: Printing Messages

 16.4.6 Printing Messages
 You can print different kinds of warning messages from your extension,
 as described here.  Note that for these functions, you must pass in the
 extension ID received from 'gawk' when the extension was loaded:(1)
 'void fatal(awk_ext_id_t id, const char *format, ...);'
      Print a message and then cause 'gawk' to exit immediately.
 'void nonfatal(awk_ext_id_t id, const char *format, ...);'
      Print a nonfatal error message.
 'void warning(awk_ext_id_t id, const char *format, ...);'
      Print a warning message.
 'void lintwarn(awk_ext_id_t id, const char *format, ...);'
      Print a "lint warning."  Normally this is the same as printing a
      warning message, but if 'gawk' was invoked with '--lint=fatal',
      then lint warnings become fatal error messages.
    All of these functions are otherwise like the C 'printf()' family of
 functions, where the 'format' parameter is a string with literal
 characters and formatting codes intermixed.
    ---------- Footnotes ----------
    (1) Because the API uses only ISO C 90 features, it cannot make use
 of the ISO C 99 variadic macro feature to hide that parameter.  More's
 the pity.
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