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例 1 convenient way how glob() can replace opendir() and friends.
fwrite

this multiple-stage type of processing, similar to a stairway, allows convenient processing of a variable number of arguments.
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fdf_error() returns a textual description for the fdf error code given in error_code. the function uses the internal error code set by the last operation if no error_code is given, so fdf_error() is a convenient shortcut for fdf_error(fdf_errno()).
the function uses the internal error code set by the last operation if no error_code is given, so fdf_error() is a convenient shortcut for fdf_error(fdf_errno()).