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printf.c revision 1.3 
      1 /*-
      2  * Copyright (c) 1993
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  *
     33  *	from: @(#)printf.c	8.1 (Berkeley) 6/11/93
     34  *	     $Id: printf.c,v 1.3 1994/08/22 21:56:10 brezak Exp $
     35  */
     36 
     37 /*
     38  * Scaled down version of printf(3).
     39  *
     40  * One additional format:
     41  *
     42  * The format %b is supported to decode error registers.
     43  * Its usage is:
     44  *
     45  *	printf("reg=%b\n", regval, "<base><arg>*");
     46  *
     47  * where <base> is the output base expressed as a control character, e.g.
     48  * \10 gives octal; \20 gives hex.  Each arg is a sequence of characters,
     49  * the first of which gives the bit number to be inspected (origin 1), and
     50  * the next characters (up to a control character, i.e. a character <= 32),
     51  * give the name of the register.  Thus:
     52  *
     53  *	printf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n");
     54  *
     55  * would produce output:
     56  *
     57  *	reg=3<BITTWO,BITONE>
     58  */
     59 
     60 #include <sys/cdefs.h>
     61 #include <sys/types.h>
     62 #ifdef __STDC__
     63 #include <stdarg.h>
     64 #else
     65 #include <varargs.h>
     66 #endif
     67 
     68 #include "stand.h"
     69 
     70 static void kprintn __P((u_long, int));
     71 
     72 void
     73 #ifdef __STDC__
     74 printf(const char *fmt, ...)
     75 #else
     76 printf(fmt, va_alist)
     77 	char *fmt;
     78 #endif
     79 {
     80 	register char *p;
     81 	register int ch, n;
     82 	unsigned long ul;
     83 	int lflag, set;
     84 	va_list ap;
     85 
     86 #ifdef __STDC__
     87 	va_start(ap, fmt);
     88 #else
     89 	va_start(ap);
     90 #endif
     91 	for (;;) {
     92 		while ((ch = *fmt++) != '%') {
     93 			if (ch == '\0')
     94 				return;
     95 			putchar(ch);
     96 		}
     97 		lflag = 0;
     98 reswitch:	switch (ch = *fmt++) {
     99 		case 'l':
    100 			lflag = 1;
    101 			goto reswitch;
    102 		case 'b':
    103 			ul = va_arg(ap, int);
    104 			p = va_arg(ap, char *);
    105 			kprintn(ul, *p++);
    106 
    107 			if (!ul)
    108 				break;
    109 
    110 			for (set = 0; (n = *p++);) {
    111 				if (ul & (1 << (n - 1))) {
    112 					putchar(set ? ',' : '<');
    113 					for (; (n = *p) > ' '; ++p)
    114 						putchar(n);
    115 					set = 1;
    116 				} else
    117 					for (; *p > ' '; ++p);
    118 			}
    119 			if (set)
    120 				putchar('>');
    121 			break;
    122 		case 'c':
    123 			ch = va_arg(ap, int);
    124 				putchar(ch & 0x7f);
    125 			break;
    126 		case 's':
    127 			p = va_arg(ap, char *);
    128 			while ((ch = *p++))
    129 				putchar(ch);
    130 			break;
    131 		case 'd':
    132 			ul = lflag ?
    133 			    va_arg(ap, long) : va_arg(ap, int);
    134 			if ((long)ul < 0) {
    135 				putchar('-');
    136 				ul = -(long)ul;
    137 			}
    138 			kprintn(ul, 10);
    139 			break;
    140 		case 'o':
    141 			ul = lflag ?
    142 			    va_arg(ap, u_long) : va_arg(ap, u_int);
    143 			kprintn(ul, 8);
    144 			break;
    145 		case 'u':
    146 			ul = lflag ?
    147 			    va_arg(ap, u_long) : va_arg(ap, u_int);
    148 			kprintn(ul, 10);
    149 			break;
    150 		case 'x':
    151 			ul = lflag ?
    152 			    va_arg(ap, u_long) : va_arg(ap, u_int);
    153 			kprintn(ul, 16);
    154 			break;
    155 		default:
    156 			putchar('%');
    157 			if (lflag)
    158 				putchar('l');
    159 			putchar(ch);
    160 		}
    161 	}
    162 	va_end(ap);
    163 }
    164 
    165 static void
    166 kprintn(ul, base)
    167 	unsigned long ul;
    168 	int base;
    169 {
    170 					/* hold a long in base 8 */
    171 	char *p, buf[(sizeof(long) * NBBY / 3) + 1];
    172 
    173 	p = buf;
    174 	do {
    175 		*p++ = "0123456789abcdef"[ul % base];
    176 	} while (ul /= base);
    177 	do {
    178 		putchar(*--p);
    179 	} while (p > buf);
    180 }
    181