/* * pANS stdio -- vsnprintf */#include "iolib.h"int vsnprintf(char *buf, int nbuf, const char *fmt, va_list args){	int n;	FILE *f=sopenw();	if(f==NULL)		return 0;	setvbuf(f, buf, _IOFBF, nbuf);	n=vfprintf(f, fmt, args);	sclose(f);	return n;}