嵌入式系统设计与实例开发源码

				/* $Id: printf.c,v 1.3 1997/03/18 18:00:00 jj Exp $				 * printf.c:  Internal prom library printf facility.				 *				 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)				 * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)				 */								/* This routine is internal to the prom library, no one else should know				 * about or use it!  It's simple and smelly anyway....				 */								#include 								#include 				#include 								static char ppbuf[1024];								extern void prom_puts (char *, int);								void				prom_printf(char *fmt, ...)				{					va_list args;					char ch, *bptr, *last;					int i;									va_start(args, fmt);					i = vsprintf(ppbuf, fmt, args);									bptr = ppbuf;					last = ppbuf;									while((ch = *(bptr++)) != 0) {						if(ch == '\n') {							if (last < bptr - 1)								prom_puts (last, bptr - 1 - last);							prom_putchar('\r');							last = bptr - 1;						}					}					if (last < bptr - 1)						prom_puts (last, bptr - 1 - last);					va_end(args);					return;				}