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[unix-history] / usr / src / sys / kern / subr_prf.c

/*	subr_prf.c	4.6	%G%	*/

#include "../h/param.h"
#include "../h/systm.h"
#include "../h/seg.h"
#include "../h/buf.h"
#include "../h/conf.h"
#include "../h/mtpr.h"
#include "../h/reboot.h"
#include "../h/vm.h"
#include "../h/msgbuf.h"
#include "../h/dir.h"
#include "../h/user.h"
#include "../h/tty.h"

#ifdef TRACE
#define	TRCBUFS	4096
char	trcbuf[TRCBUFS];
char	*trcbufp = trcbuf;
int	trcwrap;
int	trcprt = TRCBUFS;
#endif

/*
 * In case console is off,
 * panicstr contains argument to last
 * call to panic.
 */

char	*panicstr;

/*
 * Scaled down version of C Library printf.
 * Only %s %u %d (==%u) %o %x %D are recognized.
 * Used to print diagnostic information
 * directly on console tty.
 * Since it is not interrupt driven,
 * all system activities are pretty much
 * suspended.
 * Printf should not be used for chit-chat.
 */
/*VARARGS1*/
printf(fmt, x1)
register char *fmt;
unsigned x1;
{

	prf(fmt, &x1, 0);
}

#ifdef TRACE
trace(fmt, x1)
register char *fmt;
unsigned x1;
{

	prf(fmt, &x1, 1);
}

#endif

prf(fmt, adx, trace)
register char *fmt;
register unsigned int *adx;
{
	register c;
	char *s;

loop:
	while((c = *fmt++) != '%') {
		if(c == '\0')
			return;
		putchar(c, trace);
	}
	c = *fmt++;
	if (c == 'X')
		printx((long)*adx, trace);
	else if (c == 'd' || c == 'u' || c == 'o' || c == 'x')
		printn((long)*adx, c=='o'? 8: (c=='x'? 16:10), trace);
	else if (c == 's') {
		s = (char *)*adx;
		while (c = *s++)
#ifdef TRACE
			if (trace == 1) {
				*trcbufp++ = c;
				if (trcbufp >= &trcbuf[TRCBUFS]) {
					trcbufp = trcbuf;
					trcwrap = 1;
				}
			} else
#endif
				putchar(c, trace);
	} else if (c == 'D') {
		printn(*(long *)adx, 10, trace);
		adx += (sizeof(long) / sizeof(int)) - 1;
	}
	adx++;
	goto loop;
}

printx(x, trace)
long x;
{
	int i;

	for (i = 0; i < 8; i++)
		putchar("0123456789ABCDEF"[(x>>((7-i)*4))&0xf], trace);
}

/*
 * Print an integer in base b.  If the base is ten it is condidered a
 * signed integer otherwise it is treated as unsigned.
 */
printn(n, b, trace)
unsigned long n;
{
	register unsigned long a;
	register long a1 = n;

	if (b == 10 && a1 < 0) {
		putchar('-', trace);
		n = -a1;
	}
	if(a = n/b)
		printn(a, b, trace);
	putchar("0123456789ABCDEF"[(int)(n%b)], trace);
}

/*
 * Panic is called on unresolvable fatal errors.
 * It syncs, prints "panic: mesg", and then reboots.
 */
panic(s)
char *s;
{
	panicstr = s;
	printf("panic: %s\n", s);
	(void) spl0();
	for(;;)
		boot(RB_PANIC, RB_AUTOBOOT);
}

/*
 * prdev prints a warning message of the
 * form "mesg on dev x/y".
 * x and y are the major and minor parts of
 * the device argument.
 */
prdev(str, dev)
char *str;
dev_t dev;
{

	printf("%s on dev %u/%u\n", str, major(dev), minor(dev));
}

/*
 * deverr prints a diagnostic from
 * a device driver.
 * It prints the device, block number,
 * and an octal word (usually some error
 * status register) passed as argument.
 */
deverror(bp, o1, o2)
register struct buf *bp;
{

	printf("bn=%d er=%x,%x", bp->b_blkno, o1,o2);
	prdev("", bp->b_dev);
}

#ifdef TRACE
dumptrc()
{
	register char *cp;
	register int pos, nch;

	nch = trcprt;
	if (nch < 0 || nch > TRCBUFS)
		nch = TRCBUFS;
	pos = (trcbufp - trcbuf) - nch;
	if (pos < 0)
		if (trcwrap)
			pos += TRCBUFS;
		else {
			nch += pos;
			pos = 0;
		}
	for (cp = &trcbuf[pos]; nch > 0; nch--) {
		putchar(*cp++, 0);
		if (cp >= &trcbuf[TRCBUFS])
			cp = trcbuf;
	}
}
#else
/*ARGSUSED*/
dumptrc(nch)
	int nch;
{

}
#endif

/*
 * Print a character on console or in internal trace buffer.
 * If destination is console then the last MSGBUFS characters
 * are saved in msgbuf for inspection later.
 */
/*ARGSUSED*/
putchar(c, trace)
register c;
{

	if (trace == 2) {
		register struct tty *tp;
		register s;

		if ((tp = u.u_ttyp) && (tp->t_state&CARR_ON)) {
			s = spl7();
			ttyoutput(c, tp);
			ttstart(tp);
			splx(s);
		}
		return;
	}
#ifdef TRACE
	if (trace) {
		*trcbufp++ = c;
		if (trcbufp >= &trcbuf[TRCBUFS]) {
			trcbufp = trcbuf;
			trcwrap = 1;
		}
		return;
	}
#endif
	if (c != '\0' && c != '\r' && c != 0177) {
		if (msgbuf.msg_magic != MSG_MAGIC) {
			msgbuf.msg_bufx = 0;
			msgbuf.msg_magic = MSG_MAGIC;
		}
		if (msgbuf.msg_bufx < 0 || msgbuf.msg_bufx >= MSG_BSIZE)
			msgbuf.msg_bufx = 0;
		msgbuf.msg_bufc[msgbuf.msg_bufx++] = c;
	}
	if (c == 0)
		return;
	cnputc(c);
}

/*
 * print to the current users terminal,
 * guarantee not to sleep (so can be called by intr routine)
 * no watermark checking - so no verbose messages
 */

/*VARARGS1*/
uprintf(fmt, x1)
char	*fmt;
unsigned x1;
{
	prf(fmt, &x1, 2);
}