linux嵌入式课程实践中的一个关于声卡驱动程序 。

				/* $Id: printf.c,v 1.7 2000/02/08 20:24:23 davem Exp $				 * printf.c:  Internal prom library printf facility.				 *				 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)				 */								/* 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];								void				prom_printf(char *fmt, ...)				{					va_list args;					char ch, *bptr;					int i;									va_start(args, fmt);					i = vsprintf(ppbuf, fmt, args);									bptr = ppbuf;									while((ch = *(bptr++)) != 0) {						if(ch == '\n')							prom_putchar('\r');										prom_putchar(ch);					}					va_end(args);					return;				}