xref: /plan9/sys/src/ape/lib/fmt/fmtfdflush.c (revision 40ef9009116dd37656783aaadc8782c1d8bfb056)
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 <stdarg.h>
15 #include <unistd.h>
16 #include "fmt.h"
17 #include "fmtdef.h"
18 
19 /*
20  * generic routine for flushing a formatting buffer
21  * to a file descriptor
22  */
23 int
__fmtFdFlush(Fmt * f)24 __fmtFdFlush(Fmt *f)
25 {
26 	int n;
27 
28 	n = (char*)f->to - (char*)f->start;
29 	if(n && write((int)f->farg, f->start, n) != n)
30 		return 0;
31 	f->to = f->start;
32 	return 1;
33 }
34