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twiddle.c revision 1.2 
      1 /*	$NetBSD: twiddle.c,v 1.2 1999/02/22 07:53:52 simonb Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  *
     35  *	@(#)printf.c	8.1 (Berkeley) 6/11/93
     36  */
     37 
     38 /*
     39  * Scaled down version of printf(3).
     40  *
     41  * One additional format:
     42  *
     43  * The format %b is supported to decode error registers.
     44  * Its usage is:
     45  *
     46  *	printf("reg=%b\n", regval, "<base><arg>*");
     47  *
     48  * where <base> is the output base expressed as a control character, e.g.
     49  * \10 gives octal; \20 gives hex.  Each arg is a sequence of characters,
     50  * the first of which gives the bit number to be inspected (origin 1), and
     51  * the next characters (up to a control character, i.e. a character <= 32),
     52  * give the name of the register.  Thus:
     53  *
     54  *	printf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n");
     55  *
     56  * would produce output:
     57  *
     58  *	reg=3<BITTWO,BITONE>
     59  */
     60 
     61 #include <sys/cdefs.h>
     62 #include <sys/types.h>
     63 
     64 #include "stand.h"
     65 
     66 #define TWIDDLE_CHARS	"|/-\\"
     67 
     68 void
     69 twiddle()
     70 {
     71 	static int pos;
     72 
     73 #ifdef SA_NOPUTCHAR
     74 	printf("%c\b", TWIDDLE_CHARS[pos++ & 3]);
     75 #else
     76 	putchar(TWIDDLE_CHARS[pos++ & 3]);
     77 	putchar('\b');
     78 #endif
     79 
     80 }
     81