github.com/tcnksm/go@v0.0.0-20141208075154-439b32936367/src/lib9/fmt/fmtfdflush.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   * generic routine for flushing a formatting buffer
    25   * to a file descriptor
    26   */
    27  int
    28  __fmtFdFlush(Fmt *f)
    29  {
    30  	int n;
    31  
    32  	n = (int)((char*)f->to - (char*)f->start);
    33  	if(n && (int)write((int)(uintptr)f->farg, f->start, (size_t)n) != n)
    34  		return 0;
    35  	f->to = f->start;
    36  	return 1;
    37  }