1 #include <u.h>
2 #include <libc.h>
3 #include "fmtdef.h"
4
5 /*
6 * generic routine for flushing a formatting buffer
7 * to a file descriptor
8 */
9 int
_fmtFdFlush(Fmt * f)10 _fmtFdFlush(Fmt *f)
11 {
12 int n;
13
14 n = (char*)f->to - (char*)f->start;
15 if(n && write((int)(uintptr)f->farg, f->start, n) != n)
16 return 0;
17 f->to = f->start;
18 return 1;
19 }
20
21 int
vfprint(int fd,char * fmt,va_list args)22 vfprint(int fd, char *fmt, va_list args)
23 {
24 Fmt f;
25 char buf[256];
26 int n;
27
28 fmtfdinit(&f, fd, buf, sizeof(buf));
29 f.args = args;
30 n = dofmt(&f, fmt);
31 if(n > 0 && _fmtFdFlush(&f) == 0)
32 return -1;
33 return n;
34 }
35