[unix-history] / usr / src / sys / stand / printf.c

/*-
 * Copyright (c) 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *	@(#)printf.c	8.1 (Berkeley) %G%
 */

/*
 * 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>

/*
 * Note that stdarg.h and the ANSI style va_start macro is used for both
 * ANSI and traditional C compilers.
 */
#define KERNEL
#include <machine/stdarg.h>
#undef KERNEL

static void kprintn __P((u_long, int));

void
#if __STDC__
printf(const char *fmt, ...)
#else
printf(fmt /* , va_alist */)
	char *fmt;
#endif
{
	register char *p;
	register int ch, n;
	unsigned long ul;
	int lflag, set;
	va_list ap;

	va_start(ap, fmt);
	for (;;) {
		while ((ch = *fmt++) != '%') {
			if (ch == '\0')
				return;
			putchar(ch);
		}
		lflag = 0;
reswitch:	switch (ch = *fmt++) {
		case 'l':
			lflag = 1;
			goto reswitch;
		case 'b':
			ul = va_arg(ap, int);
			p = va_arg(ap, char *);
			kprintn(ul, *p++);

			if (!ul)
				break;

			for (set = 0; n = *p++;) {
				if (ul & (1 << (n - 1))) {
					putchar(set ? ',' : '<');
					for (; (n = *p) > ' '; ++p)
						putchar(n);
					set = 1;
				} else
					for (; *p > ' '; ++p);
			}
			if (set)
				putchar('>');
			break;
		case 'c':
			ch = va_arg(ap, int);
				putchar(ch & 0x7f);
			break;
		case 's':
			p = va_arg(ap, char *);
			while (ch = *p++)
				putchar(ch);
			break;
		case 'd':
			ul = lflag ?
			    va_arg(ap, long) : va_arg(ap, int);
			if ((long)ul < 0) {
				putchar('-');
				ul = -(long)ul;
			}
			kprintn(ul, 10);
			break;
		case 'o':
			ul = lflag ?
			    va_arg(ap, u_long) : va_arg(ap, u_int);
			kprintn(ul, 8);
			break;
		case 'u':
			ul = lflag ?
			    va_arg(ap, u_long) : va_arg(ap, u_int);
			kprintn(ul, 10);
			break;
		case 'x':
			ul = lflag ?
			    va_arg(ap, u_long) : va_arg(ap, u_int);
			kprintn(ul, 16);
			break;
		default:
			putchar('%');
			if (lflag)
				putchar('l');
			putchar(ch);
		}
	}
	va_end(ap);
}

static void
kprintn(ul, base)
	unsigned long ul;
	int base;
{
					/* hold a long in base 8 */
	char *p, buf[(sizeof(long) * NBBY / 3) + 1];

	p = buf;
	do {
		*p++ = "0123456789abcdef"[ul % base];
	} while (ul /= base);
	do {
		putchar(*--p);
	} while (p > buf);
}
Commit	Line	Data
5c40db76	1	/*-
80409bdc KB	2	* Copyright (c) 1993
80409bdc KB	3	* The Regents of the University of California. All rights reserved.
5c40db76 KM	4	*
	5	* %sccs.include.redist.c%
	6	*
80409bdc	7	* @(#)printf.c 8.1 (Berkeley) %G%
5c40db76 KM	8	*/
	9
	10	/*
	11	* Scaled down version of printf(3).
	12	*
	13	* One additional format:
	14	*
	15	* The format %b is supported to decode error registers.
	16	* Its usage is:
	17	*
	18	* printf("reg=%b\n", regval, "<base><arg>*");
	19	*
	20	* where <base> is the output base expressed as a control character, e.g.
	21	* \10 gives octal; \20 gives hex. Each arg is a sequence of characters,
	22	* the first of which gives the bit number to be inspected (origin 1), and
	23	* the next characters (up to a control character, i.e. a character <= 32),
	24	* give the name of the register. Thus:
	25	*
	26	* printf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n");
	27	*
	28	* would produce output:
	29	*
	30	* reg=3<BITTWO,BITONE>
	31	*/
	32
	33	#include <sys/cdefs.h>
	34	#include <sys/types.h>
	35
	36	/*
	37	* Note that stdarg.h and the ANSI style va_start macro is used for both
	38	* ANSI and traditional C compilers.
	39	*/
	40	#define KERNEL
	41	#include <machine/stdarg.h>
	42	#undef KERNEL
	43
	44	static void kprintn __P((u_long, int));
	45
	46	void
	47	#if __STDC__
	48	printf(const char *fmt, ...)
	49	#else
	50	printf(fmt /* , va_alist */)
	51	char *fmt;
	52	#endif
	53	{
	54	register char *p;
	55	register int ch, n;
	56	unsigned long ul;
	57	int lflag, set;
	58	va_list ap;
	59
	60	va_start(ap, fmt);
	61	for (;;) {
	62	while ((ch = *fmt++) != '%') {
	63	if (ch == '\0')
	64	return;
	65	putchar(ch);
	66	}
	67	lflag = 0;
	68	reswitch: switch (ch = *fmt++) {
	69	case 'l':
	70	lflag = 1;
	71	goto reswitch;
72	case 'b':
73	ul = va_arg(ap, int);
74	p = va_arg(ap, char *);
75	kprintn(ul, *p++);
76
77	if (!ul)
78	break;
79
80	for (set = 0; n = *p++;) {
81	if (ul & (1 << (n - 1))) {
82	putchar(set ? ',' : '<');
83	for (; (n = *p) > ' '; ++p)
84	putchar(n);
85	set = 1;
86	} else
87	for (; *p > ' '; ++p);
88	}
89	if (set)
90	putchar('>');
91	break;
92	case 'c':
93	ch = va_arg(ap, int);
94	putchar(ch & 0x7f);
95	break;
96	case 's':
97	p = va_arg(ap, char *);
98	while (ch = *p++)
99	putchar(ch);
100	break;
101	case 'd':
102	ul = lflag ?
103	va_arg(ap, long) : va_arg(ap, int);
104	if ((long)ul < 0) {
105	putchar('-');
106	ul = -(long)ul;
107	}
108	kprintn(ul, 10);
109	break;
110	case 'o':
111	ul = lflag ?
112	va_arg(ap, u_long) : va_arg(ap, u_int);
113	kprintn(ul, 8);
114	break;
115	case 'u':
116	ul = lflag ?
117	va_arg(ap, u_long) : va_arg(ap, u_int);
118	kprintn(ul, 10);
119	break;
120	case 'x':
121	ul = lflag ?
122	va_arg(ap, u_long) : va_arg(ap, u_int);
123	kprintn(ul, 16);
124	break;
125	default:
126	putchar('%');
127	if (lflag)
128	putchar('l');
129	putchar(ch);
130	}
131	}
132	va_end(ap);
133	}
134
135	static void
136	kprintn(ul, base)
137	unsigned long ul;
138	int base;
139	{
140	/* hold a long in base 8 */
141	char p, buf[(sizeof(long) NBBY / 3) + 1];
142
143	p = buf;
144	do {
145	*p++ = "0123456789abcdef"[ul % base];
146	} while (ul /= base);
147	do {
148	putchar(*--p);
149	} while (p > buf);
150	}