C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
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setbuf, setvbuf
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─────Run-Time Library───────────────────────────────────────────────────────
 
  Include:   <stdio.h>
 
  Syntax:    void setbuf( FILE *stream, char *buffer );
             int setvbuf( FILE *stream, char *buffer,
                          int mode, size_t size );
 
             mode: _IOFBF, _IOLBF, _IONBF
 
  Returns:   for setvbuf, 0 if successful, or a nonzero value if an
             illegal type or buffer size is specified.
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