fmtfd.c

这是一个同样来自贝尔实验室的和UNIX有着渊源的操作系统, 其简洁的设计和实现易于我们学习和理解

/*
 * 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 <stdarg.h>
#include <string.h>
#include "utf.h"
#include "fmt.h"
#include "fmtdef.h"

/*
 * public routine for final flush of a formatting buffer
 * to a file descriptor; returns total char count.
 */
int
fmtfdflush(Fmt *f)
{
	if(__fmtFdFlush(f) <= 0)
		return -1;
	return f->nfmt;
}

/*
 * initialize an output buffer for buffered printing
 */
int
fmtfdinit(Fmt *f, int fd, char *buf, int size)
{
	f->runes = 0;
	f->start = buf;
	f->to = buf;
	f->stop = buf + size;
	f->flush = __fmtFdFlush;
	f->farg = (void*)fd;
	f->nfmt = 0;
	return 0;
}