misc pre-mba changes (non-recursive printf, futz, resuba, %uXX...)

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

/*      subr_prf.c      4.7     %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"

/*
* 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);
}

/*
* 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);
}

/* THIS CODE IS VAX DEPENDENT */
prf(fmt, adx, touser)
register char *fmt;
register u_int *adx;
{
       register int b, c;
       char *s;

loop:
       while ((c = *fmt++) != '%') {
               if(c == '\0')
                       return;
               putchar(c, touser);
       }
again:
       c = *fmt++;
       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(*adx, b, touser);
               break;
       case 'c':
               c = *adx;
               while (c) {
                       putchar(c&0x7f, touser);
                       c >>= 8;
               }
               break;
       case 's':
               s = (char *)*adx;
               while (c = *s++)
                       putchar(c, touser);
               break;
       }
       adx++;
       goto loop;
}
/* END VAX DEPENDENT CODE */

printn(n, b, touser)
       unsigned long n;
{
       char buf[11];
       register char *cp;

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

/*
* 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 %d/%d\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);
}

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

       if (touser) {
               register struct tty *tp = u.u_ttyp;

               if (tp && (tp->t_state&CARR_ON)) {
                       register s = spl6();
                       if (c == '\n')
                               ttyoutput('\r', tp);
                       ttyoutput(c, tp);
                       ttstart(tp);
                       splx(s);
               }
               return;
       }
       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);
}