ref: a411870ee4640241e3c494367d922847da84f972
dir: /lib9/vfprint.c/
/*
* The authors of this software are Rob Pike and Ken Thompson.
* Copyright (c) 2002 by Lucent Technologies.
* Permission to use, copy, modify, and distribute this software for any
* purpose without fee is hereby granted, provided that this entire notice
* is included in all copies of any software which is or includes a copy
* or modification of this software and in all copies of the supporting
* documentation for such software.
* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTY. IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES MAKE ANY
* REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
* OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
*/
#include "lib9.h"
#include "fmtdef.h"
/*
* generic routine for flushing a formatting buffer
* to a file descriptor
*/
int
_fmtFdFlush(Fmt *f)
{
int n;
n = (char*)f->to - (char*)f->start;
if(n && write((int)f->farg, f->start, n) != n)
return 0;
f->to = f->start;
return 1;
}
int
vfprint(int fd, char *fmt, va_list args)
{
Fmt f;
char buf[256];
int n;
fmtfdinit(&f, fd, buf, sizeof(buf));
va_copy(f.args, args);
n = dofmt(&f, fmt);
va_end(f.args);
if(n > 0 && _fmtFdFlush(&f) == 0)
return -1;
return n;
}