github.com/hbdrawn/golang@v0.0.0-20141214014649-6b835209aba2/src/lib9/fmt/fmtnull.c (about)

     1  /*
     2   * The authors of this software are Rob Pike and Ken Thompson,
     3   * with contributions from Mike Burrows and Sean Dorward.
     4   *
     5   *     Copyright (c) 2002-2006 by Lucent Technologies.
     6   *     Portions Copyright (c) 2004 Google Inc.
     7   * 
     8   * Permission to use, copy, modify, and distribute this software for any
     9   * purpose without fee is hereby granted, provided that this entire notice
    10   * is included in all copies of any software which is or includes a copy
    11   * or modification of this software and in all copies of the supporting
    12   * documentation for such software.
    13   * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
    14   * WARRANTY.  IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES 
    15   * NOR GOOGLE INC MAKE ANY REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING 
    16   * THE MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
    17   */
    18  
    19  #include <u.h>
    20  #include <libc.h>
    21  #include "fmtdef.h"
    22  
    23  /*
    24   * Absorb output without using resources.
    25   */
    26  static Rune nullbuf[32];
    27  
    28  static int
    29  __fmtnullflush(Fmt *f)
    30  {
    31  	f->to = nullbuf;
    32  	f->nfmt = 0;
    33  	return 0;
    34  }
    35  
    36  int
    37  fmtnullinit(Fmt *f)
    38  {
    39  	memset(f, 0, sizeof *f);
    40  	f->runes = 1;
    41  	f->start = nullbuf;
    42  	f->to = nullbuf;
    43  	f->stop = nullbuf+nelem(nullbuf);
    44  	f->flush = __fmtnullflush;
    45  	fmtlocaleinit(f, nil, nil, nil);
    46  	return 0;
    47  }
    48