fmtprint.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"


/*
 * format a string into the output buffer
 * designed for formats which themselves call fmt,
 * but ignore any width flags
 */
int
fmtprint(Fmt *f, char *fmt, ...)
{
	va_list va;
	int n;

	f->flags = 0;
	f->width = 0;
	f->prec = 0;
	va = f->args;
	va_start(f->args, fmt);
	n = dofmt(f, fmt);
	va_end(f->args);
	f->flags = 0;
	f->width = 0;
	f->prec = 0;
	f->args = va;
	if(n >= 0)
		return 0;
	return n;
}