printf.c revision 1.21 
1/*	$OpenBSD: printf.c,v 1.21 2003/08/11 06:23:09 deraadt Exp $	*/
2/*	$NetBSD: printf.c,v 1.10 1996/11/30 04:19:21 gwr Exp $	*/
3
4/*-
5 * Copyright (c) 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 *	@(#)printf.c	8.1 (Berkeley) 6/11/93
33 */
34
35/*
36 * Scaled down version of printf(3).
37 *
38 * One additional format:
39 *
40 * The format %b is supported to decode error registers.
41 * Its usage is:
42 *
43 *	printf("reg=%b\n", regval, "<base><arg>*");
44 *
45 * where <base> is the output base expressed as a control character, e.g.
46 * \10 gives octal; \20 gives hex.  Each arg is a sequence of characters,
47 * the first of which gives the bit number to be inspected (origin 1), and
48 * the next characters (up to a control character, i.e. a character <= 32),
49 * give the name of the register.  Thus:
50 *
51 *	printf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n");
52 *
53 * would produce output:
54 *
55 *	reg=3<BITTWO,BITONE>
56 */
57
58#include <sys/cdefs.h>
59#include <sys/types.h>
60#include <machine/stdarg.h>
61
62#include "stand.h"
63
64void kprintn(void (*)(int), u_long, int);
65void kdoprnt(void (*)(int), const char *, va_list);
66
67void
68printf(const char *fmt, ...)
69{
70	va_list ap;
71
72	va_start(ap, fmt);
73	kdoprnt(putchar, fmt, ap);
74	va_end(ap);
75}
76
77void
78vprintf(const char *fmt, va_list ap)
79{
80	kdoprnt(putchar, fmt, ap);
81}
82
83void
84kdoprnt(void (*put)(int), const char *fmt, va_list ap)
85{
86	unsigned long ul;
87	int ch, lflag;
88	char *p;
89
90	for (;;) {
91		while ((ch = *fmt++) != '%') {
92			if (ch == '\0')
93				return;
94			put(ch);
95		}
96		lflag = 0;
97reswitch:	switch (ch = *fmt++) {
98		case 'l':
99			lflag = 1;
100			goto reswitch;
101#ifndef	STRIPPED
102		case 'b':
103		{
104			int set, n;
105
106			ul = va_arg(ap, int);
107			p = va_arg(ap, char *);
108			kprintn(put, ul, *p++);
109
110			if (!ul)
111				break;
112
113			for (set = 0; (n = *p++);) {
114				if (ul & (1 << (n - 1))) {
115					put(set ? ',' : '<');
116					for (; (n = *p) > ' '; ++p)
117						put(n);
118					set = 1;
119				} else
120					for (; *p > ' '; ++p)
121						;
122			}
123			if (set)
124				put('>');
125		}
126			break;
127#endif
128		case 'c':
129			ch = va_arg(ap, int);
130			put(ch & 0x7f);
131			break;
132		case 's':
133			p = va_arg(ap, char *);
134			while ((ch = *p++))
135				put(ch);
136			break;
137		case 'd':
138			ul = lflag ?
139			    va_arg(ap, long) : va_arg(ap, int);
140			if ((long)ul < 0) {
141				put('-');
142				ul = -(long)ul;
143			}
144			kprintn(put, ul, 10);
145			break;
146		case 'o':
147			ul = lflag ?
148			    va_arg(ap, u_long) : va_arg(ap, u_int);
149			kprintn(put, ul, 8);
150			break;
151		case 'u':
152			ul = lflag ?
153			    va_arg(ap, u_long) : va_arg(ap, u_int);
154			kprintn(put, ul, 10);
155			break;
156		case 'p':
157			put('0');
158			put('x');
159			lflag += sizeof(void *)==sizeof(u_long)? 1 : 0;
160		case 'x':
161			ul = lflag ?
162			    va_arg(ap, u_long) : va_arg(ap, u_int);
163			kprintn(put, ul, 16);
164			break;
165		default:
166			put('%');
167			if (lflag)
168				put('l');
169			put(ch);
170		}
171	}
172	va_end(ap);
173}
174
175void
176kprintn(void (*put)(int), unsigned long ul, int base)
177{
178	/* hold a long in base 8 */
179	char *p, buf[(sizeof(long) * NBBY / 3) + 1];
180
181	p = buf;
182	do {
183		*p++ = "0123456789abcdef"[ul % base];
184	} while (ul /= base);
185	do {
186		put(*--p);
187	} while (p > buf);
188}
189
190int donottwiddle = 0;
191
192void
193twiddle(void)
194{
195	static int pos;
196
197	if (!donottwiddle) {
198		putchar("|/-\\"[pos++ & 3]);
199		putchar('\b');
200	}
201}
202