github.com/ccccaoqing/test@v0.0.0-20220510085219-3985d23445c0/src/libbio/bprint.c (about)

     1  /*
     2  http://code.google.com/p/inferno-os/source/browse/libbio/bprint.c
     3  
     4  	Copyright © 1994-1999 Lucent Technologies Inc.  All rights reserved.
     5  	Revisions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com).  All rights reserved.
     6  	Revisions Copyright © 2010 Google Inc.  All rights reserved.
     7  
     8  Permission is hereby granted, free of charge, to any person obtaining a copy
     9  of this software and associated documentation files (the "Software"), to deal
    10  in the Software without restriction, including without limitation the rights
    11  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    12  copies of the Software, and to permit persons to whom the Software is
    13  furnished to do so, subject to the following conditions:
    14  
    15  The above copyright notice and this permission notice shall be included in
    16  all copies or substantial portions of the Software.
    17  
    18  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    19  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    20  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
    21  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    22  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    23  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    24  THE SOFTWARE.
    25  */
    26  
    27  #include	<u.h>
    28  #include	<libc.h>
    29  #include	<bio.h>
    30  
    31  int
    32  Bprint(Biobuf *bp, char *fmt, ...)
    33  {
    34  	int n;
    35  	va_list arg;
    36  
    37  	va_start(arg, fmt);
    38  	n = Bvprint(bp, fmt, arg);
    39  	va_end(arg);
    40  	return n;
    41  }
    42  
    43  static int
    44  bflush(Fmt *f)
    45  {
    46  	Biobuf *bp;
    47  	
    48  	if(f->stop == nil)
    49  		return 0;
    50  
    51  	bp = f->farg;
    52  	bp->ocount = (int)((char*)f->to - (char*)f->stop);
    53  	if(Bflush(bp) < 0) {
    54  		f->stop = nil;
    55  		f->to = nil;
    56  		return 0;
    57  	}
    58  	f->to = (char*)f->stop + bp->ocount;
    59  	
    60  	return 1;
    61  }
    62  
    63  int
    64  Bvprint(Biobuf *bp, char *fmt, va_list arg)
    65  {
    66  	int n;
    67  	Fmt f;
    68  	
    69  	memset(&f, 0, sizeof f);
    70  	fmtlocaleinit(&f, nil, nil, nil);
    71  	f.stop = bp->ebuf;
    72  	f.to = (char*)f.stop + bp->ocount;
    73  	f.flush = bflush;
    74  	f.farg = bp;
    75  
    76  	n = fmtvprint(&f, fmt, arg);
    77  
    78  	if(f.stop != nil)
    79  		bp->ocount = (int)((char*)f.to - (char*)f.stop);
    80  
    81  	return n;
    82  }