/*	prf.c	1.2	86/11/04	*/
/*	prf.c	4.3	81/05/05	*/

#include "../machine/mtpr.h"

#include "param.h"
#include "../tahoe/cp.h"

/*
 * Scaled down version of C Library printf.
 * Used to print diagnostic information directly on console tty.
 * Since it is not interrupt driven, all system activities are
 * suspended.  Printf should not be used for chit-chat.
 *
 * One additional format: %b is supported to decode error registers.
 * 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=2<BITTWO,BITONE>
 */
/*VARARGS1*/
printf(fmt, x1)
	char *fmt;
	unsigned x1;
{

	prf(fmt, &x1);
}

prf(fmt, adx)
	register char *fmt;
	register u_int *adx;
{
	register int b, c, i;
	char *s;
	int any;

loop:
	while ((c = *fmt++) != '%') {
		if (c == '\0')
			return;
		putchar(c);
	}
again:
	c = *fmt++;
	/* THIS CODE IS VAX DEPENDENT IN HANDLING %l? AND %c */
	switch (c) {

	case 'l':
		goto again;
	case 'x': case 'X':
		b = 16;
		goto number;
	case 'd': case 'D':
	case 'u':		/* what a joke */
		b = 10;
		goto number;
	case 'o': case 'O':
		b = 8;
number:
		printn((u_long)*adx, b);
		break;
	case 'c':
		b = *adx;
		for (i = 24; i >= 0; i -= 8)
			if (c = (b >> i) & 0x7f)
				putchar(c);
		break;
	case 'b':
		b = *adx++;
		s = (char *)*adx;
		printn((u_long)b, *s++);
		any = 0;
		if (b) {
			while (i = *s++) {
				if (b & (1 << (i-1))) {
					putchar(any? ',' : '<');
					any = 1;
					for (; (c = *s) > 32; s++)
						putchar(c);
				} else
					for (; *s > 32; s++)
						;
			}
			if (any)
				putchar('>');
		}
		break;

	case 's':
		s = (char *)*adx;
		while (c = *s++)
			putchar(c);
		break;
	}
	adx++;
	goto loop;
}

/*
 * Printn prints a number n in base b.
 * We don't use recursion to avoid deep kernel stacks.
 */
printn(n, b)
	u_long n;
{
	char prbuf[11];
	register char *cp;

	if (b == 10 && (int)n < 0) {
		putchar('-');
		n = (unsigned)(-(int)n);
	}
	cp = prbuf;
	do {
		*cp++ = "0123456789abcdef"[n%b];
		n /= b;
	} while (n);
	do
		putchar(*--cp);
	while (cp > prbuf);
}

/*
 * Print a character on console.
 */
struct	cpdcb_o cpout;
struct	cpdcb_i cpin;

/* console requires even parity */
#define EVENP

putchar(c)
	char c;
{
	int time;
#ifdef EVENP
	register mask, par;

	for (par = 0, mask = 1; mask != 0200; mask <<= 1, par <<= 1)
		par ^= c&mask;
	c |= par;
#endif EVENP
	cpout.cp_hdr.cp_unit = CPCONS;	/* Resets done bit */
	cpout.cp_hdr.cp_comm = CPWRITE;
	cpout.cp_hdr.cp_count = 1;
	cpout.cp_buf[0] = c;
	mtpr(CPMDCB, &cpout);
	time = 100000;				/* Delay loop */
	while (time--) {
		uncache(&cpout.cp_hdr.cp_unit);
		if (cpout.cp_hdr.cp_unit & CPDONE)
			break;
	}
	if (c == '\n')
		putchar ('\r');
}

getchar()
{
	char c;

	cpin.cp_hdr.cp_unit = CPCONS;	/* Resets done bit */
	cpin.cp_hdr.cp_comm = CPREAD;
	cpin.cp_hdr.cp_count = 1;
	mtpr(CPMDCB, &cpin);
	while ((cpin.cp_hdr.cp_unit & CPDONE) == 0) 
		uncache(&cpin.cp_hdr.cp_unit);
	uncache(&cpin.cpi_buf[0]);
	c = cpin.cpi_buf[0] & 0x7f;
	if (c == '\r')
		c = '\n';
	if (c != '\b' && c != '\177')
		putchar(c);
	return (c);
}

gets(buf)
	char *buf;
{
	register char *lp;
	register c;

	lp = buf;
	for (;;) {
		c = getchar() & 0177;
		switch(c) {
		case '\n':
		case '\r':
			c = '\n';
			*lp++ = '\0';
			return;
		case '\b':
		case '\177':
			if (lp > buf) {
				lp--;
				putchar('\b');
				putchar(' ');
				putchar('\b');
			}
			continue;
		case '#':
			if (--lp < buf)
				lp = buf;
			continue;
		case '@':
		case 'u'&037:
			lp = buf;
			putchar('\n');
			continue;
		default:
			*lp++ = c;
		}
	}
}