text: /*	$OpenBSD: printf.c,v 1.24 2006/09/18 21:11:50 mpf Exp $	*/
  /*	$NetBSD: printf.c,v 1.10 1996/11/30 04:19:21 gwr Exp $	*/
  
  /*-
   * Copyright (c) 1993
   *	The Regents of the University of California.  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   *	@(#)printf.c	8.1 (Berkeley) 6/11/93
   */
  
  /*
   * Scaled down version of printf(3).
   *
   * One additional format:
   *
   * The format %b is supported to decode error registers.
   * Its usage is:
   *
   *	printf("reg=%b\n", regval, "<base><arg>*");
   *
   * where <base> is the output base expressed as a control character, e.g.
   * \10 gives octal; \20 gives hex.  Each arg is a sequence of characters,
   * the first of which gives the bit number to be inspected (origin 1), and
   * the next characters (up to a control character, i.e. a character <= 32),
   * give the name of the register.  Thus:
   *
   *	printf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n");
   *
   * would produce output:
   *
   *	reg=3<BITTWO,BITONE>
   */
  
  #include <sys/cdefs.h>
  #include <sys/types.h>
  #include <sys/stdarg.h>
  
  #include "stand.h"
  
  void kprintn(void (*)(int), u_long, int);
  #ifdef LIBSA_LONGLONG_PRINTF
  void kprintn64(void (*)(int), u_int64_t, int);
  #endif
  void kdoprnt(void (*)(int), const char *, va_list);
  
  const char hexdig[] = "0123456789abcdef";
  
  void
  printf(const char *fmt, ...)
  {
  	va_list ap;
  
  	va_start(ap, fmt);
  	kdoprnt(putchar, fmt, ap);
  	va_end(ap);
  }
  
  void
  vprintf(const char *fmt, va_list ap)
  {
  	kdoprnt(putchar, fmt, ap);
  }
  
  void
  kdoprnt(void (*put)(int), const char *fmt, va_list ap)
  {
  #ifdef LIBSA_LONGLONG_PRINTF
  	u_int64_t ull;
  #endif
  	unsigned long ul;
  	int ch, lflag;
  	char *p;
  
  	for (;;) {
  		while ((ch = *fmt++) != '%') {
  			if (ch == '\0')
  				return;
  			put(ch);
  		}
  		lflag = 0;
  reswitch:	switch (ch = *fmt++) {
  		case 'l':
  			lflag++;
  			goto reswitch;
  #ifndef	STRIPPED
  		case 'b':
  		{
  			int set, n;
  
  			ul = va_arg(ap, int);
  			p = va_arg(ap, char *);
  			kprintn(put, ul, *p++);
  
  			if (!ul)
  				break;
  
  			for (set = 0; (n = *p++);) {
  				if (ul & (1 << (n - 1))) {
  					put(set ? ',' : '<');
  					for (; (n = *p) > ' '; ++p)
  						put(n);
  					set = 1;
  				} else
  					for (; *p > ' '; ++p)
  						;
  			}
  			if (set)
  				put('>');
  		}
  			break;
  #endif
  		case 'c':
  			ch = va_arg(ap, int);
  			put(ch & 0x7f);
  			break;
  		case 's':
  			p = va_arg(ap, char *);
  			while ((ch = *p++))
  				put(ch);
  			break;
  		case 'd':
  #ifdef LIBSA_LONGLONG_PRINTF
  			if (lflag > 1) {
  				ull = va_arg(ap, int64_t);
  				if ((int64_t)ull < 0) {
  					put('-');
  					ull = -(int64_t)ull;
  				}
  				kprintn64(put, ull, 10);
  				break;
  			} 
  #endif
  			ul = lflag ?
  			    va_arg(ap, long) : va_arg(ap, int);
  			if ((long)ul < 0) {
  				put('-');
  				ul = -(long)ul;
  			}
  			kprintn(put, ul, 10);
  			break;
  		case 'o':
  #ifdef LIBSA_LONGLONG_PRINTF
  			if (lflag > 1) {
  				ull = va_arg(ap, u_int64_t);
  				kprintn64(put, ull, 8);
  				break;
  			} 
  #endif
  			ul = lflag ?
  			    va_arg(ap, u_long) : va_arg(ap, u_int);
  			kprintn(put, ul, 8);
  			break;
  		case 'u':
  #ifdef LIBSA_LONGLONG_PRINTF
  			if (lflag > 1) {
  				ull = va_arg(ap, u_int64_t);
  				kprintn64(put, ull, 10);
  				break;
  			} 
  #endif
  			ul = lflag ?
  			    va_arg(ap, u_long) : va_arg(ap, u_int);
  			kprintn(put, ul, 10);
  			break;
  		case 'p':
  			put('0');
  			put('x');
  			lflag += sizeof(void *)==sizeof(u_long)? 1 : 0;
  		case 'x':
  #ifdef LIBSA_LONGLONG_PRINTF
  			if (lflag > 1) {
  				ull = va_arg(ap, u_int64_t);
  				kprintn64(put, ull, 16);
  				break;
  			}
  #else
   			if (lflag > 1) {
  				/* hold an int64_t in base 16 */
  				char *p, buf[(sizeof(u_int64_t) * NBBY / 4) + 1];
  				u_int64_t ull;
  
   				ull = va_arg(ap, u_int64_t);
  				p = buf;
  				do {
  					*p++ = hexdig[ull & 15];
  				} while (ull >>= 4);
  				do {
  					put(*--p);
  				} while (p > buf);
   				break;
   			}
  #endif
  			ul = lflag ?
  			    va_arg(ap, u_long) : va_arg(ap, u_int);
  			kprintn(put, ul, 16);
  			break;
  		default:
  			put('%');
  #ifdef LIBSA_LONGLONG_PRINTF
  			while (--lflag)
  #else
  			if (lflag)
  #endif
  				put('l');
  			put(ch);
  		}
  	}
  	va_end(ap);
  }
  
  void
  kprintn(void (*put)(int), unsigned long ul, int base)
  {
  	/* hold a long in base 8 */
  	char *p, buf[(sizeof(long) * NBBY / 3) + 1];
  
  	p = buf;
  	do {
  		*p++ = hexdig[ul % base];
  	} while (ul /= base);
  	do {
  		put(*--p);
  	} while (p > buf);
  }
  
  #ifdef LIBSA_LONGLONG_PRINTF
  void
  kprintn64(void (*put)(int), u_int64_t ull, int base)
  {
  	/* hold an int64_t in base 8 */
  	char *p, buf[(sizeof(u_int64_t) * NBBY / 3) + 1];
  
  	p = buf;
  	do {
  		*p++ = hexdig[ull % base];
  	} while (ull /= base);
  	do {
  		put(*--p);
  	} while (p > buf);
  }
  #endif
  
  int donottwiddle = 0;
  
  void
  twiddle(void)
  {
  	static int pos;
  
  	if (!donottwiddle) {
  		putchar("|/-\\"[pos++ & 3]);
  		putchar('\b');
  	}
  }
  