ref: ac4840116ef15e2fc65d0e68f7e16d3a8a1aa2f8
dir: /sys/src/cmd/unix/drawterm/libc/vfprint.c/
#include <u.h>
#include <libc.h>
#include "fmtdef.h"
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;
}