f1550d9d41
behavior of their userland counterparts with respect to return values. Submitted by: Matthew N. Dodd <winter@jurai.net>
816 lines
17 KiB
C
816 lines
17 KiB
C
/*-
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* Copyright (c) 1986, 1988, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)subr_prf.c 8.3 (Berkeley) 1/21/94
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* $Id: subr_prf.c,v 1.57 1999/07/14 17:37:53 peter Exp $
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/msgbuf.h>
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#include <sys/malloc.h>
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#include <sys/proc.h>
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#include <sys/tty.h>
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#include <sys/tprintf.h>
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#include <sys/syslog.h>
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#include <machine/cons.h>
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/*
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* Note that stdarg.h and the ANSI style va_start macro is used for both
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* ANSI and traditional C compilers.
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*/
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#include <machine/stdarg.h>
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#define TOCONS 0x01
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#define TOTTY 0x02
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#define TOLOG 0x04
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/* Max number conversion buffer length: a u_quad_t in base 2, plus NUL byte. */
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#define MAXNBUF (sizeof(quad_t) * NBBY + 1)
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struct putchar_arg {
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int flags;
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struct tty *tty;
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};
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struct snprintf_arg {
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char *str;
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size_t remain;
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};
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struct tty *constty; /* pointer to console "window" tty */
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static void (*v_putc)(int) = cnputc; /* routine to putc on virtual console */
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static void logpri __P((int level));
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static void msglogchar(int c, void *dummyarg);
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static void putchar __P((int ch, void *arg));
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static char *ksprintn __P((char *nbuf, u_long num, int base, int *len));
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static char *ksprintqn __P((char *nbuf, u_quad_t num, int base, int *len));
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static void snprintf_func __P((int ch, void *arg));
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static int consintr = 1; /* Ok to handle console interrupts? */
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static int msgbufmapped; /* Set when safe to use msgbuf */
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/*
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* Warn that a system table is full.
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*/
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void
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tablefull(tab)
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const char *tab;
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{
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log(LOG_ERR, "%s: table is full\n", tab);
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}
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/*
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* Uprintf prints to the controlling terminal for the current process.
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* It may block if the tty queue is overfull. No message is printed if
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* the queue does not clear in a reasonable time.
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*/
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int
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uprintf(const char *fmt, ...)
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{
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struct proc *p = curproc;
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va_list ap;
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struct putchar_arg pca;
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int retval = 0;
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if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) {
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va_start(ap, fmt);
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pca.tty = p->p_session->s_ttyp;
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pca.flags = TOTTY;
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retval = kvprintf(fmt, putchar, &pca, 10, ap);
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va_end(ap);
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}
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return retval;
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}
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tpr_t
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tprintf_open(p)
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register struct proc *p;
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{
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if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) {
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SESSHOLD(p->p_session);
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return ((tpr_t) p->p_session);
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}
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return ((tpr_t) NULL);
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}
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void
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tprintf_close(sess)
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tpr_t sess;
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{
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if (sess)
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SESSRELE((struct session *) sess);
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}
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/*
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* tprintf prints on the controlling terminal associated
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* with the given session.
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*/
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int
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tprintf(tpr_t tpr, const char *fmt, ...)
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{
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register struct session *sess = (struct session *)tpr;
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struct tty *tp = NULL;
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int flags = TOLOG;
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va_list ap;
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struct putchar_arg pca;
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int retval;
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logpri(LOG_INFO);
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if (sess && sess->s_ttyvp && ttycheckoutq(sess->s_ttyp, 0)) {
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flags |= TOTTY;
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tp = sess->s_ttyp;
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}
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va_start(ap, fmt);
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pca.tty = tp;
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pca.flags = flags;
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retval = kvprintf(fmt, putchar, &pca, 10, ap);
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va_end(ap);
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logwakeup();
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return retval;
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}
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/*
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* Ttyprintf displays a message on a tty; it should be used only by
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* the tty driver, or anything that knows the underlying tty will not
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* be revoke(2)'d away. Other callers should use tprintf.
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*/
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int
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ttyprintf(struct tty *tp, const char *fmt, ...)
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{
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va_list ap;
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struct putchar_arg pca;
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int retval;
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va_start(ap, fmt);
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pca.tty = tp;
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pca.flags = TOTTY;
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retval = kvprintf(fmt, putchar, &pca, 10, ap);
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va_end(ap);
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return retval;
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}
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extern int log_open;
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/*
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* Log writes to the log buffer, and guarantees not to sleep (so can be
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* called by interrupt routines). If there is no process reading the
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* log yet, it writes to the console also.
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*/
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int
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log(int level, const char *fmt, ...)
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{
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register int s;
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va_list ap;
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int retval;
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s = splhigh();
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logpri(level);
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va_start(ap, fmt);
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retval = kvprintf(fmt, msglogchar, NULL, 10, ap);
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va_end(ap);
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splx(s);
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if (!log_open) {
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struct putchar_arg pca;
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va_start(ap, fmt);
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pca.tty = NULL;
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pca.flags = TOCONS;
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retval += kvprintf(fmt, putchar, &pca, 10, ap);
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va_end(ap);
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}
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logwakeup();
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return retval;
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}
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static void
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logpri(level)
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int level;
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{
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char nbuf[MAXNBUF];
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register char *p;
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msglogchar('<', NULL);
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for (p = ksprintn(nbuf, (u_long)level, 10, NULL); *p;)
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msglogchar(*p--, NULL);
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msglogchar('>', NULL);
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}
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int
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addlog(const char *fmt, ...)
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{
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register int s;
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va_list ap;
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int retval;
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s = splhigh();
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va_start(ap, fmt);
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retval = kvprintf(fmt, msglogchar, NULL, 10, ap);
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splx(s);
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va_end(ap);
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if (!log_open) {
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struct putchar_arg pca;
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va_start(ap, fmt);
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pca.tty = NULL;
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pca.flags = TOCONS;
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retval += kvprintf(fmt, putchar, &pca, 10, ap);
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va_end(ap);
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}
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logwakeup();
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return (retval);
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}
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int
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printf(const char *fmt, ...)
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{
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va_list ap;
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register int savintr;
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struct putchar_arg pca;
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int retval;
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savintr = consintr; /* disable interrupts */
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consintr = 0;
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va_start(ap, fmt);
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pca.tty = NULL;
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pca.flags = TOCONS | TOLOG;
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retval = kvprintf(fmt, putchar, &pca, 10, ap);
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va_end(ap);
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if (!panicstr)
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logwakeup();
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consintr = savintr; /* reenable interrupts */
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return retval;
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}
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int
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vprintf(const char *fmt, va_list ap)
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{
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register int savintr;
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struct putchar_arg pca;
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int retval;
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savintr = consintr; /* disable interrupts */
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consintr = 0;
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pca.tty = NULL;
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pca.flags = TOCONS | TOLOG;
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retval = kvprintf(fmt, putchar, &pca, 10, ap);
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if (!panicstr)
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logwakeup();
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consintr = savintr; /* reenable interrupts */
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return retval;
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}
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/*
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* Print a character on console or users terminal. If destination is
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* the console then the last bunch of characters are saved in msgbuf for
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* inspection later.
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*/
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static void
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putchar(int c, void *arg)
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{
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struct putchar_arg *ap = (struct putchar_arg*) arg;
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int flags = ap->flags;
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struct tty *tp = ap->tty;
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if (panicstr)
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constty = NULL;
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if ((flags & TOCONS) && tp == NULL && constty) {
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tp = constty;
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flags |= TOTTY;
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}
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if ((flags & TOTTY) && tp && tputchar(c, tp) < 0 &&
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(flags & TOCONS) && tp == constty)
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constty = NULL;
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if ((flags & TOLOG))
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msglogchar(c, NULL);
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if ((flags & TOCONS) && constty == NULL && c != '\0')
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(*v_putc)(c);
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}
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/*
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* Scaled down version of sprintf(3).
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*/
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int
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sprintf(char *buf, const char *cfmt, ...)
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{
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int retval;
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va_list ap;
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va_start(ap, cfmt);
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retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
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buf[retval] = '\0';
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va_end(ap);
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return retval;
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}
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/*
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* Scaled down version of vsprintf(3).
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*/
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int
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vsprintf(char *buf, const char *cfmt, va_list ap)
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{
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int retval;
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retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
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buf[retval] = '\0';
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return retval;
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}
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/*
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* Scaled down version of snprintf(3).
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*/
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int
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snprintf(char *str, size_t size, const char *format, ...)
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{
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int retval;
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va_list ap;
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va_start(ap, format);
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retval = vsnprintf(str, size, format, ap);
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va_end(ap);
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return(retval);
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}
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/*
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* Scaled down version of vsnprintf(3).
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*/
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int
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vsnprintf(char *str, size_t size, const char *format, va_list ap)
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{
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struct snprintf_arg info;
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int retval;
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info.str = str;
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info.remain = size;
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retval = kvprintf(format, snprintf_func, &info, 10, ap);
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if (info.remain >= 1)
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*info.str++ = '\0';
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return retval;
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}
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static void
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snprintf_func(int ch, void *arg)
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{
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struct snprintf_arg *const info = arg;
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if (info->remain >= 2) {
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*info->str++ = ch;
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info->remain--;
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}
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}
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/*
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* Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse
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* order; return an optional length and a pointer to the last character
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* written in the buffer (i.e., the first character of the string).
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* The buffer pointed to by `nbuf' must have length >= MAXNBUF.
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*/
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static char *
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ksprintn(nbuf, ul, base, lenp)
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char *nbuf;
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register u_long ul;
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register int base, *lenp;
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{
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register char *p;
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p = nbuf;
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*p = '\0';
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do {
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*++p = hex2ascii(ul % base);
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} while (ul /= base);
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if (lenp)
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*lenp = p - nbuf;
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return (p);
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}
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/* ksprintn, but for a quad_t. */
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static char *
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ksprintqn(nbuf, uq, base, lenp)
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char *nbuf;
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register u_quad_t uq;
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register int base, *lenp;
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{
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register char *p;
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p = nbuf;
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*p = '\0';
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do {
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*++p = hex2ascii(uq % base);
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} while (uq /= base);
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if (lenp)
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*lenp = p - nbuf;
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return (p);
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}
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/*
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* Scaled down version of printf(3).
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*
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* Two additional formats:
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*
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* The format %b is supported to decode error registers.
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* Its usage is:
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*
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* printf("reg=%b\n", regval, "<base><arg>*");
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*
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* where <base> is the output base expressed as a control character, e.g.
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* \10 gives octal; \20 gives hex. Each arg is a sequence of characters,
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* the first of which gives the bit number to be inspected (origin 1), and
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* the next characters (up to a control character, i.e. a character <= 32),
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* give the name of the register. Thus:
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*
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* kvprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n");
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*
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* would produce output:
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*
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* reg=3<BITTWO,BITONE>
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*
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* XXX: %D -- Hexdump, takes pointer and separator string:
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* ("%6D", ptr, ":") -> XX:XX:XX:XX:XX:XX
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* ("%*D", len, ptr, " " -> XX XX XX XX ...
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*/
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int
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kvprintf(char const *fmt, void (*func)(int, void*), void *arg, int radix, va_list ap)
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{
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#define PCHAR(c) {int cc=(c); if (func) (*func)(cc,arg); else *d++ = cc; retval++; }
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char nbuf[MAXNBUF];
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char *p, *q, *d;
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u_char *up;
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int ch, n;
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u_long ul;
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u_quad_t uq;
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int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot;
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int dwidth;
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char padc;
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int retval = 0;
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ul = 0;
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uq = 0;
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if (!func)
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d = (char *) arg;
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else
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d = NULL;
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if (fmt == NULL)
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fmt = "(fmt null)\n";
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if (radix < 2 || radix > 36)
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radix = 10;
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for (;;) {
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padc = ' ';
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width = 0;
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while ((ch = (u_char)*fmt++) != '%') {
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if (ch == '\0')
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return retval;
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PCHAR(ch);
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}
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qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0;
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sign = 0; dot = 0; dwidth = 0;
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reswitch: switch (ch = (u_char)*fmt++) {
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case '.':
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dot = 1;
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goto reswitch;
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case '#':
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sharpflag = 1;
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goto reswitch;
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case '+':
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sign = 1;
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goto reswitch;
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case '-':
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ladjust = 1;
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goto reswitch;
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case '%':
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PCHAR(ch);
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break;
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case '*':
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if (!dot) {
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width = va_arg(ap, int);
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if (width < 0) {
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ladjust = !ladjust;
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width = -width;
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}
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} else {
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dwidth = va_arg(ap, int);
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}
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goto reswitch;
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case '0':
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if (!dot) {
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padc = '0';
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goto reswitch;
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}
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case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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for (n = 0;; ++fmt) {
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n = n * 10 + ch - '0';
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ch = *fmt;
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if (ch < '0' || ch > '9')
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break;
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}
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if (dot)
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dwidth = n;
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else
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|
width = n;
|
|
goto reswitch;
|
|
case 'b':
|
|
ul = va_arg(ap, int);
|
|
p = va_arg(ap, char *);
|
|
for (q = ksprintn(nbuf, ul, *p++, NULL); *q;)
|
|
PCHAR(*q--);
|
|
|
|
if (!ul)
|
|
break;
|
|
|
|
for (tmp = 0; *p;) {
|
|
n = *p++;
|
|
if (ul & (1 << (n - 1))) {
|
|
PCHAR(tmp ? ',' : '<');
|
|
for (; (n = *p) > ' '; ++p)
|
|
PCHAR(n);
|
|
tmp = 1;
|
|
} else
|
|
for (; *p > ' '; ++p)
|
|
continue;
|
|
}
|
|
if (tmp)
|
|
PCHAR('>');
|
|
break;
|
|
case 'c':
|
|
PCHAR(va_arg(ap, int));
|
|
break;
|
|
case 'D':
|
|
up = va_arg(ap, u_char *);
|
|
p = va_arg(ap, char *);
|
|
if (!width)
|
|
width = 16;
|
|
while(width--) {
|
|
PCHAR(hex2ascii(*up >> 4));
|
|
PCHAR(hex2ascii(*up & 0x0f));
|
|
up++;
|
|
if (width)
|
|
for (q=p;*q;q++)
|
|
PCHAR(*q);
|
|
}
|
|
break;
|
|
case 'd':
|
|
if (qflag)
|
|
uq = va_arg(ap, quad_t);
|
|
else if (lflag)
|
|
ul = va_arg(ap, long);
|
|
else
|
|
ul = va_arg(ap, int);
|
|
sign = 1;
|
|
base = 10;
|
|
goto number;
|
|
case 'l':
|
|
lflag = 1;
|
|
goto reswitch;
|
|
case 'o':
|
|
if (qflag)
|
|
uq = va_arg(ap, u_quad_t);
|
|
else if (lflag)
|
|
ul = va_arg(ap, u_long);
|
|
else
|
|
ul = va_arg(ap, u_int);
|
|
base = 8;
|
|
goto nosign;
|
|
case 'p':
|
|
ul = (uintptr_t)va_arg(ap, void *);
|
|
base = 16;
|
|
sharpflag = (width == 0);
|
|
goto nosign;
|
|
case 'q':
|
|
qflag = 1;
|
|
goto reswitch;
|
|
case 'n':
|
|
case 'r':
|
|
if (qflag)
|
|
uq = va_arg(ap, u_quad_t);
|
|
else if (lflag)
|
|
ul = va_arg(ap, u_long);
|
|
else
|
|
ul = sign ?
|
|
(u_long)va_arg(ap, int) : va_arg(ap, u_int);
|
|
base = radix;
|
|
goto number;
|
|
case 's':
|
|
p = va_arg(ap, char *);
|
|
if (p == NULL)
|
|
p = "(null)";
|
|
if (!dot)
|
|
n = strlen (p);
|
|
else
|
|
for (n = 0; n < dwidth && p[n]; n++)
|
|
continue;
|
|
|
|
width -= n;
|
|
|
|
if (!ladjust && width > 0)
|
|
while (width--)
|
|
PCHAR(padc);
|
|
while (n--)
|
|
PCHAR(*p++);
|
|
if (ladjust && width > 0)
|
|
while (width--)
|
|
PCHAR(padc);
|
|
break;
|
|
case 'u':
|
|
if (qflag)
|
|
uq = va_arg(ap, u_quad_t);
|
|
else if (lflag)
|
|
ul = va_arg(ap, u_long);
|
|
else
|
|
ul = va_arg(ap, u_int);
|
|
base = 10;
|
|
goto nosign;
|
|
case 'x':
|
|
if (qflag)
|
|
uq = va_arg(ap, u_quad_t);
|
|
else if (lflag)
|
|
ul = va_arg(ap, u_long);
|
|
else
|
|
ul = va_arg(ap, u_int);
|
|
base = 16;
|
|
goto nosign;
|
|
case 'z':
|
|
if (qflag)
|
|
uq = va_arg(ap, u_quad_t);
|
|
else if (lflag)
|
|
ul = va_arg(ap, u_long);
|
|
else
|
|
ul = sign ?
|
|
(u_long)va_arg(ap, int) : va_arg(ap, u_int);
|
|
base = 16;
|
|
goto number;
|
|
nosign: sign = 0;
|
|
number:
|
|
if (qflag) {
|
|
if (sign && (quad_t)uq < 0) {
|
|
neg = 1;
|
|
uq = -(quad_t)uq;
|
|
}
|
|
p = ksprintqn(nbuf, uq, base, &tmp);
|
|
} else {
|
|
if (sign && (long)ul < 0) {
|
|
neg = 1;
|
|
ul = -(long)ul;
|
|
}
|
|
p = ksprintn(nbuf, ul, base, &tmp);
|
|
}
|
|
if (sharpflag && (qflag ? uq != 0 : ul != 0)) {
|
|
if (base == 8)
|
|
tmp++;
|
|
else if (base == 16)
|
|
tmp += 2;
|
|
}
|
|
if (neg)
|
|
tmp++;
|
|
|
|
if (!ladjust && width && (width -= tmp) > 0)
|
|
while (width--)
|
|
PCHAR(padc);
|
|
if (neg)
|
|
PCHAR('-');
|
|
if (sharpflag && (qflag ? uq != 0 : ul != 0)) {
|
|
if (base == 8) {
|
|
PCHAR('0');
|
|
} else if (base == 16) {
|
|
PCHAR('0');
|
|
PCHAR('x');
|
|
}
|
|
}
|
|
|
|
while (*p)
|
|
PCHAR(*p--);
|
|
|
|
if (ladjust && width && (width -= tmp) > 0)
|
|
while (width--)
|
|
PCHAR(padc);
|
|
|
|
break;
|
|
default:
|
|
PCHAR('%');
|
|
if (lflag)
|
|
PCHAR('l');
|
|
PCHAR(ch);
|
|
break;
|
|
}
|
|
}
|
|
#undef PCHAR
|
|
}
|
|
|
|
/*
|
|
* Put character in log buffer.
|
|
*/
|
|
static void
|
|
msglogchar(int c, void *dummyarg)
|
|
{
|
|
struct msgbuf *mbp;
|
|
|
|
if (c != '\0' && c != '\r' && c != 0177 && msgbufmapped) {
|
|
mbp = msgbufp;
|
|
mbp->msg_ptr[mbp->msg_bufx++] = c;
|
|
if (mbp->msg_bufx >= mbp->msg_size)
|
|
mbp->msg_bufx = 0;
|
|
/* If the buffer is full, keep the most recent data. */
|
|
if (mbp->msg_bufr == mbp->msg_bufx) {
|
|
if (++mbp->msg_bufr >= mbp->msg_size)
|
|
mbp->msg_bufr = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
msgbufcopy(struct msgbuf *oldp)
|
|
{
|
|
int pos;
|
|
|
|
pos = oldp->msg_bufr;
|
|
while (pos != oldp->msg_bufx) {
|
|
msglogchar(oldp->msg_ptr[pos], NULL);
|
|
if (++pos >= oldp->msg_size)
|
|
pos = 0;
|
|
}
|
|
}
|
|
|
|
void
|
|
msgbufinit(void *ptr, size_t size)
|
|
{
|
|
char *cp;
|
|
static struct msgbuf *oldp = NULL;
|
|
|
|
cp = (char *)ptr;
|
|
msgbufp = (struct msgbuf *) (cp + size - sizeof(*msgbufp));
|
|
if (msgbufp->msg_magic != MSG_MAGIC || msgbufp->msg_ptr != cp) {
|
|
bzero(cp, size);
|
|
msgbufp->msg_magic = MSG_MAGIC;
|
|
msgbufp->msg_size = (char *)msgbufp - cp;
|
|
msgbufp->msg_ptr = cp;
|
|
}
|
|
if (msgbufmapped && oldp != msgbufp)
|
|
msgbufcopy(oldp);
|
|
msgbufmapped = 1;
|
|
oldp = msgbufp;
|
|
}
|
|
|
|
#include "opt_ddb.h"
|
|
#ifdef DDB
|
|
#include <ddb/ddb.h>
|
|
|
|
DB_SHOW_COMMAND(msgbuf, db_show_msgbuf)
|
|
{
|
|
int i, j;
|
|
|
|
if (!msgbufmapped) {
|
|
db_printf("msgbuf not mapped yet\n");
|
|
return;
|
|
}
|
|
db_printf("msgbufp = %p\n", msgbufp);
|
|
db_printf("magic = %x, size = %d, r= %d, w = %d, ptr = %p\n",
|
|
msgbufp->msg_magic, msgbufp->msg_size, msgbufp->msg_bufr,
|
|
msgbufp->msg_bufx, msgbufp->msg_ptr);
|
|
for (i = 0; i < msgbufp->msg_size; i++) {
|
|
j = (i + msgbufp->msg_bufr) % msgbufp->msg_size;
|
|
db_printf("%c", msgbufp->msg_ptr[j]);
|
|
}
|
|
db_printf("\n");
|
|
}
|
|
|
|
#endif /* DDB */
|