1 /*
2 * The authors of this software are Rob Pike and Ken Thompson.
3 * Copyright (c) 2002 by Lucent Technologies.
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose without fee is hereby granted, provided that this entire notice
6 * is included in all copies of any software which is or includes a copy
7 * or modification of this software and in all copies of the supporting
8 * documentation for such software.
9 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
10 * WARRANTY. IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES MAKE ANY
11 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
12 * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
13 */
14 #include "lib9.h"
15 #include "fmtdef.h"
16
17 /*
18 * generic routine for flushing a formatting buffer
19 * to a file descriptor
20 */
21 int
_fmtFdFlush(Fmt * f)22 _fmtFdFlush(Fmt *f)
23 {
24 int n;
25
26 n = (char*)f->to - (char*)f->start;
27 if(n && write((int)f->farg, f->start, n) != n)
28 return 0;
29 f->to = f->start;
30 return 1;
31 }
32
33 int
vfprint(int fd,char * fmt,va_list args)34 vfprint(int fd, char *fmt, va_list args)
35 {
36 Fmt f;
37 char buf[256];
38 int n;
39
40 fmtfdinit(&f, fd, buf, sizeof(buf));
41 va_copy(f.args, args);
42 n = dofmt(&f, fmt);
43 va_end(f.args);
44 if(n > 0 && _fmtFdFlush(&f) == 0)
45 return -1;
46 return n;
47 }
48