4.4BSD/usr/src/sys/kern/subr_prf.c
/*-
* Copyright (c) 1986, 1988, 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)subr_prf.c 8.1 (Berkeley) 6/10/93
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/conf.h>
#include <sys/reboot.h>
#include <sys/msgbuf.h>
#include <sys/proc.h>
#include <sys/ioctl.h>
#include <sys/vnode.h>
#include <sys/file.h>
#include <sys/tty.h>
#include <sys/tprintf.h>
#include <sys/syslog.h>
#include <sys/malloc.h>
/*
* Note that stdarg.h and the ANSI style va_start macro is used for both
* ANSI and traditional C compilers.
*/
#include <machine/stdarg.h>
#ifdef KADB
#include <machine/kdbparam.h>
#endif
#define TOCONS 0x01
#define TOTTY 0x02
#define TOLOG 0x04
struct tty *constty; /* pointer to console "window" tty */
extern cnputc(); /* standard console putc */
int (*v_putc)() = cnputc; /* routine to putc on virtual console */
void logpri __P((int level));
static void putchar __P((int ch, int flags, struct tty *tp));
static char *ksprintn __P((u_long num, int base, int *len));
void kprintf __P((const char *fmt, int flags, struct tty *tp, va_list ap));
int consintr = 1; /* Ok to handle console interrupts? */
/*
* Variable panicstr contains argument to first call to panic; used as flag
* to indicate that the kernel has already called panic.
*/
const char *panicstr;
/*
* Panic is called on unresolvable fatal errors. It prints "panic: mesg",
* and then reboots. If we are called twice, then we avoid trying to sync
* the disks as this often leads to recursive panics.
*/
#ifdef __GNUC__
volatile void boot(int flags); /* boot() does not return */
volatile /* panic() does not return */
#endif
void
#ifdef __STDC__
panic(const char *fmt, ...)
#else
panic(fmt, va_alist)
char *fmt;
#endif
{
int bootopt;
va_list ap;
bootopt = RB_AUTOBOOT | RB_DUMP;
if (panicstr)
bootopt |= RB_NOSYNC;
else
panicstr = fmt;
va_start(ap, fmt);
printf("panic: %r\n", fmt, ap);
va_end(ap);
#ifdef KGDB
kgdb_panic();
#endif
#ifdef KADB
if (boothowto & RB_KDB)
kdbpanic();
#endif
boot(bootopt);
}
/*
* Warn that a system table is full.
*/
void
tablefull(tab)
const char *tab;
{
log(LOG_ERR, "%s: table is full\n", tab);
}
/*
* Uprintf prints to the controlling terminal for the current process.
* It may block if the tty queue is overfull. No message is printed if
* the queue does not clear in a reasonable time.
*/
void
#ifdef __STDC__
uprintf(const char *fmt, ...)
#else
uprintf(fmt, va_alist)
char *fmt;
#endif
{
register struct proc *p = curproc;
va_list ap;
if (p->p_flag & SCTTY && p->p_session->s_ttyvp) {
va_start(ap, fmt);
kprintf(fmt, TOTTY, p->p_session->s_ttyp, ap);
va_end(ap);
}
}
tpr_t
tprintf_open(p)
register struct proc *p;
{
if (p->p_flag & SCTTY && p->p_session->s_ttyvp) {
SESSHOLD(p->p_session);
return ((tpr_t) p->p_session);
}
return ((tpr_t) NULL);
}
void
tprintf_close(sess)
tpr_t sess;
{
if (sess)
SESSRELE((struct session *) sess);
}
/*
* tprintf prints on the controlling terminal associated
* with the given session.
*/
void
#ifdef __STDC__
tprintf(tpr_t tpr, const char *fmt, ...)
#else
tprintf(tpr, fmt, va_alist)
tpr_t tpr;
char *fmt;
#endif
{
register struct session *sess = (struct session *)tpr;
struct tty *tp = NULL;
int flags = TOLOG;
va_list ap;
logpri(LOG_INFO);
if (sess && sess->s_ttyvp && ttycheckoutq(sess->s_ttyp, 0)) {
flags |= TOTTY;
tp = sess->s_ttyp;
}
va_start(ap, fmt);
kprintf(fmt, flags, tp, ap);
va_end(ap);
logwakeup();
}
/*
* Ttyprintf displays a message on a tty; it should be used only by
* the tty driver, or anything that knows the underlying tty will not
* be revoke(2)'d away. Other callers should use tprintf.
*/
void
#ifdef __STDC__
ttyprintf(struct tty *tp, const char *fmt, ...)
#else
ttyprintf(tp, fmt, va_alist)
struct tty *tp;
char *fmt;
#endif
{
va_list ap;
va_start(ap, fmt);
kprintf(fmt, TOTTY, tp, ap);
va_end(ap);
}
extern int log_open;
/*
* Log writes to the log buffer, and guarantees not to sleep (so can be
* called by interrupt routines). If there is no process reading the
* log yet, it writes to the console also.
*/
void
#ifdef __STDC__
log(int level, const char *fmt, ...)
#else
log(level, fmt, va_alist)
int level;
char *fmt;
#endif
{
register int s;
va_list ap;
s = splhigh();
logpri(level);
va_start(ap, fmt);
kprintf(fmt, TOLOG, NULL, ap);
splx(s);
va_end(ap);
if (!log_open) {
va_start(ap, fmt);
kprintf(fmt, TOCONS, NULL, ap);
va_end(ap);
}
logwakeup();
}
void
logpri(level)
int level;
{
register int ch;
register char *p;
putchar('<', TOLOG, NULL);
for (p = ksprintn((u_long)level, 10, NULL); ch = *p--;)
putchar(ch, TOLOG, NULL);
putchar('>', TOLOG, NULL);
}
void
#ifdef __STDC__
addlog(const char *fmt, ...)
#else
addlog(fmt, va_alist)
char *fmt;
#endif
{
register int s;
va_list ap;
s = splhigh();
va_start(ap, fmt);
kprintf(fmt, TOLOG, NULL, ap);
splx(s);
va_end(ap);
if (!log_open) {
va_start(ap, fmt);
kprintf(fmt, TOCONS, NULL, ap);
va_end(ap);
}
logwakeup();
}
void
#ifdef __STDC__
printf(const char *fmt, ...)
#else
printf(fmt, va_alist)
char *fmt;
#endif
{
va_list ap;
register int savintr;
savintr = consintr; /* disable interrupts */
consintr = 0;
va_start(ap, fmt);
kprintf(fmt, TOCONS | TOLOG, NULL, ap);
va_end(ap);
if (!panicstr)
logwakeup();
consintr = savintr; /* reenable interrupts */
}
/*
* Scaled down version of printf(3).
*
* Two additional formats:
*
* 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:
*
* kprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n");
*
* would produce output:
*
* reg=3<BITTWO,BITONE>
*
* The format %r passes an additional format string and argument list
* recursively. Its usage is:
*
* fn(char *fmt, ...)
* {
* va_list ap;
* va_start(ap, fmt);
* printf("prefix: %r: suffix\n", fmt, ap);
* va_end(ap);
* }
*
* Space or zero padding and a field width are supported for the numeric
* formats only.
*/
void
kprintf(fmt, flags, tp, ap)
register const char *fmt;
int flags;
struct tty *tp;
va_list ap;
{
register char *p, *q;
register int ch, n;
u_long ul;
int base, lflag, tmp, width;
char padc;
for (;;) {
padc = ' ';
width = 0;
while ((ch = *(u_char *)fmt++) != '%') {
if (ch == '\0')
return;
putchar(ch, flags, tp);
}
lflag = 0;
reswitch: switch (ch = *(u_char *)fmt++) {
case '0':
padc = '0';
goto reswitch;
case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
for (width = 0;; ++fmt) {
width = width * 10 + ch - '0';
ch = *fmt;
if (ch < '0' || ch > '9')
break;
}
goto reswitch;
case 'l':
lflag = 1;
goto reswitch;
case 'b':
ul = va_arg(ap, int);
p = va_arg(ap, char *);
for (q = ksprintn(ul, *p++, NULL); ch = *q--;)
putchar(ch, flags, tp);
if (!ul)
break;
for (tmp = 0; n = *p++;) {
if (ul & (1 << (n - 1))) {
putchar(tmp ? ',' : '<', flags, tp);
for (; (n = *p) > ' '; ++p)
putchar(n, flags, tp);
tmp = 1;
} else
for (; *p > ' '; ++p)
continue;
}
if (tmp)
putchar('>', flags, tp);
break;
case 'c':
putchar(va_arg(ap, int), flags, tp);
break;
case 'r':
p = va_arg(ap, char *);
kprintf(p, flags, tp, va_arg(ap, va_list));
break;
case 's':
p = va_arg(ap, char *);
while (ch = *p++)
putchar(ch, flags, tp);
break;
case 'd':
ul = lflag ? va_arg(ap, long) : va_arg(ap, int);
if ((long)ul < 0) {
putchar('-', flags, tp);
ul = -(long)ul;
}
base = 10;
goto number;
case 'o':
ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int);
base = 8;
goto number;
case 'u':
ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int);
base = 10;
goto number;
case 'x':
ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int);
base = 16;
number: p = ksprintn(ul, base, &tmp);
if (width && (width -= tmp) > 0)
while (width--)
putchar(padc, flags, tp);
while (ch = *p--)
putchar(ch, flags, tp);
break;
default:
putchar('%', flags, tp);
if (lflag)
putchar('l', flags, tp);
/* FALLTHROUGH */
case '%':
putchar(ch, flags, tp);
}
}
}
/*
* Print a character on console or users terminal. If destination is
* the console then the last MSGBUFS characters are saved in msgbuf for
* inspection later.
*/
static void
putchar(c, flags, tp)
register int c;
int flags;
struct tty *tp;
{
extern int msgbufmapped;
register struct msgbuf *mbp;
if (panicstr)
constty = NULL;
if ((flags & TOCONS) && tp == NULL && constty) {
tp = constty;
flags |= TOTTY;
}
if ((flags & TOTTY) && tp && tputchar(c, tp) < 0 &&
(flags & TOCONS) && tp == constty)
constty = NULL;
if ((flags & TOLOG) &&
c != '\0' && c != '\r' && c != 0177 && msgbufmapped) {
mbp = msgbufp;
if (mbp->msg_magic != MSG_MAGIC) {
bzero((caddr_t)mbp, sizeof(*mbp));
mbp->msg_magic = MSG_MAGIC;
}
mbp->msg_bufc[mbp->msg_bufx++] = c;
if (mbp->msg_bufx < 0 || mbp->msg_bufx >= MSG_BSIZE)
mbp->msg_bufx = 0;
}
if ((flags & TOCONS) && constty == NULL && c != '\0')
(*v_putc)(c);
}
/*
* Scaled down version of sprintf(3).
*/
#ifdef __STDC__
sprintf(char *buf, const char *cfmt, ...)
#else
sprintf(buf, cfmt, va_alist)
char *buf, *cfmt;
#endif
{
register const char *fmt = cfmt;
register char *p, *bp;
register int ch, base;
u_long ul;
int lflag;
va_list ap;
va_start(ap, cfmt);
for (bp = buf; ; ) {
while ((ch = *(u_char *)fmt++) != '%')
if ((*bp++ = ch) == '\0')
return ((bp - buf) - 1);
lflag = 0;
reswitch: switch (ch = *(u_char *)fmt++) {
case 'l':
lflag = 1;
goto reswitch;
case 'c':
*bp++ = va_arg(ap, int);
break;
case 's':
p = va_arg(ap, char *);
while (*bp++ = *p++)
continue;
--bp;
break;
case 'd':
ul = lflag ? va_arg(ap, long) : va_arg(ap, int);
if ((long)ul < 0) {
*bp++ = '-';
ul = -(long)ul;
}
base = 10;
goto number;
break;
case 'o':
ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int);
base = 8;
goto number;
break;
case 'u':
ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int);
base = 10;
goto number;
break;
case 'x':
ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int);
base = 16;
number: for (p = ksprintn(ul, base, NULL); ch = *p--;)
*bp++ = ch;
break;
default:
*bp++ = '%';
if (lflag)
*bp++ = 'l';
/* FALLTHROUGH */
case '%':
*bp++ = ch;
}
}
va_end(ap);
}
/*
* Put a number (base <= 16) in a buffer in reverse order; return an
* optional length and a pointer to the NULL terminated (preceded?)
* buffer.
*/
static char *
ksprintn(ul, base, lenp)
register u_long ul;
register int base, *lenp;
{ /* A long in base 8, plus NULL. */
static char buf[sizeof(long) * NBBY / 3 + 2];
register char *p;
p = buf;
do {
*++p = "0123456789abcdef"[ul % base];
} while (ul /= base);
if (lenp)
*lenp = p - buf;
return (p);
}