text: /*
   * printf.c:  Internal prom library printf facility.
   *
   * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   * Copyright (c) 2002 Pete Zaitcev (zaitcev@yahoo.com)
   *
   * We used to warn all over the code: DO NOT USE prom_printf(),
   * and yet people do. Anton's banking code was outputing banks
   * with prom_printf for most of the 2.4 lifetime. Since an effective
   * stick is not available, we deployed a carrot: an early printk
   * through PROM by means of -p boot option. This ought to fix it.
   * USE printk; if you need, deploy -p.
   */
  
  #include <linux/kernel.h>
  
  #include <asm/openprom.h>
  #include <asm/oplib.h>
  
  static char ppbuf[1024];
  
  void
  prom_write(const char *buf, unsigned int n)
  {
  	char ch;
  
  	while (n != 0) {
  		--n;
  		if ((ch = *buf++) == '\n')
  			prom_putchar('\r');
  		prom_putchar(ch);
  	}
  }
  
  void
  prom_printf(char *fmt, ...)
  {
  	va_list args;
  	int i;
  
  	va_start(args, fmt);
  	i = vsnprintf(ppbuf, sizeof(ppbuf), fmt, args);
  	va_end(args);
  
  	prom_write(ppbuf, i);
  }
  