vfprintf.c

很好用的

#include <stdarg.h>
#include <stdio.h>

/* -------------------------------------------------------------------- */
/* -------------------------------------------------------------------- */
static int copytoout(void *cfarg, char *str, int len)
{
	int	n;

	n = len;
	while (n--)
	{
		putc(*str, (FILE *)cfarg);
		str++;
	}

	return len;
}

/* -------------------------------------------------------------------- */
/* -------------------------------------------------------------------- */
int libport_vfprintf(FILE *fp, char *fmt, va_list args)
{
	return format(copytoout, fp, -1, fmt, args);
}