usr/src/sys/tahoe/stand/prf.c

/*      prf.c   1.3     88/03/02        */
/*      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;
}

/*
 * 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);
}