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printf.c revision 1.1 
      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 1.1 1994/01/26 02:03:53 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 
     63 /*
     64  * Note that stdarg.h and the ANSI style va_start macro is used for both
     65  * ANSI and traditional C compilers.
     66  */
     67 #define KERNEL
     68 #include <machine/stdarg.h>
     69 #undef KERNEL
     70 
     71 static void kprintn __P((u_long, int));
     72 
     73 void
     74 #if __STDC__
     75 printf(const char *fmt, ...)
     76 #else
     77 printf(fmt /* , va_alist */)
     78 	char *fmt;
     79 #endif
     80 {
     81 	register char *p;
     82 	register int ch, n;
     83 	unsigned long ul;
     84 	int lflag, set;
     85 	va_list ap;
     86 
     87 	va_start(ap, fmt);
     88 	for (;;) {
     89 		while ((ch = *fmt++) != '%') {
     90 			if (ch == '\0')
     91 				return;
     92 			putchar(ch);
     93 		}
     94 		lflag = 0;
     95 reswitch:	switch (ch = *fmt++) {
     96 		case 'l':
     97 			lflag = 1;
     98 			goto reswitch;
     99 		case 'b':
    100 			ul = va_arg(ap, int);
    101 			p = va_arg(ap, char *);
    102 			kprintn(ul, *p++);
    103 
    104 			if (!ul)
    105 				break;
    106 
    107 			for (set = 0; n = *p++;) {
    108 				if (ul & (1 << (n - 1))) {
    109 					putchar(set ? ',' : '<');
    110 					for (; (n = *p) > ' '; ++p)
    111 						putchar(n);
    112 					set = 1;
    113 				} else
    114 					for (; *p > ' '; ++p);
    115 			}
    116 			if (set)
    117 				putchar('>');
    118 			break;
    119 		case 'c':
    120 			ch = va_arg(ap, int);
    121 				putchar(ch & 0x7f);
    122 			break;
    123 		case 's':
    124 			p = va_arg(ap, char *);
    125 			while (ch = *p++)
    126 				putchar(ch);
    127 			break;
    128 		case 'd':
    129 			ul = lflag ?
    130 			    va_arg(ap, long) : va_arg(ap, int);
    131 			if ((long)ul < 0) {
    132 				putchar('-');
    133 				ul = -(long)ul;
    134 			}
    135 			kprintn(ul, 10);
    136 			break;
    137 		case 'o':
    138 			ul = lflag ?
    139 			    va_arg(ap, u_long) : va_arg(ap, u_int);
    140 			kprintn(ul, 8);
    141 			break;
    142 		case 'u':
    143 			ul = lflag ?
    144 			    va_arg(ap, u_long) : va_arg(ap, u_int);
    145 			kprintn(ul, 10);
    146 			break;
    147 		case 'x':
    148 			ul = lflag ?
    149 			    va_arg(ap, u_long) : va_arg(ap, u_int);
    150 			kprintn(ul, 16);
    151 			break;
    152 		default:
    153 			putchar('%');
    154 			if (lflag)
    155 				putchar('l');
    156 			putchar(ch);
    157 		}
    158 	}
    159 	va_end(ap);
    160 }
    161 
    162 static void
    163 kprintn(ul, base)
    164 	unsigned long ul;
    165 	int base;
    166 {
    167 					/* hold a long in base 8 */
    168 	char *p, buf[(sizeof(long) * NBBY / 3) + 1];
    169 
    170 	p = buf;
    171 	do {
    172 		*p++ = "0123456789abcdef"[ul % base];
    173 	} while (ul /= base);
    174 	do {
    175 		putchar(*--p);
    176 	} while (p > buf);
    177 }
    178