[rtems-libbsd commit] subr_prf.c: Import from FreeBSD
Sebastian Huber
sebh at rtems.org
Fri May 6 12:11:18 UTC 2016
Module: rtems-libbsd
Branch: master
Commit: 469db421d315f39ae94b72b46d590845a4aee2c9
Changeset: http://git.rtems.org/rtems-libbsd/commit/?id=469db421d315f39ae94b72b46d590845a4aee2c9
Author: Sebastian Huber <sebastian.huber at embedded-brains.de>
Date: Wed May 4 12:51:55 2016 +0200
subr_prf.c: Import from FreeBSD
---
freebsd/sys/kern/subr_prf.c | 1126 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 1126 insertions(+)
diff --git a/freebsd/sys/kern/subr_prf.c b/freebsd/sys/kern/subr_prf.c
new file mode 100644
index 0000000..0df816e
--- /dev/null
+++ b/freebsd/sys/kern/subr_prf.c
@@ -0,0 +1,1126 @@
+#include <machine/rtems-bsd-kernel-space.h>
+
+/*-
+ * Copyright (c) 1986, 1988, 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ * (c) UNIX System Laboratories, Inc.
+ * All or some portions of this file are derived from material licensed
+ * to the University of California by American Telephone and Telegraph
+ * Co. or Unix System Laboratories, Inc. and are reproduced herein with
+ * the permission of UNIX System Laboratories, Inc.
+ *
+ * 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.
+ * 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 8.3 (Berkeley) 1/21/94
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <rtems/bsd/local/opt_ddb.h>
+#include <rtems/bsd/local/opt_printf.h>
+
+#include <rtems/bsd/sys/param.h>
+#include <sys/systm.h>
+#include <rtems/bsd/sys/lock.h>
+#include <sys/kdb.h>
+#include <sys/mutex.h>
+#include <sys/sx.h>
+#include <sys/kernel.h>
+#include <sys/msgbuf.h>
+#include <sys/malloc.h>
+#include <sys/priv.h>
+#include <sys/proc.h>
+#include <sys/stddef.h>
+#include <sys/sysctl.h>
+#include <sys/tty.h>
+#include <sys/syslog.h>
+#include <sys/cons.h>
+#include <sys/uio.h>
+#include <sys/ctype.h>
+
+#ifdef DDB
+#include <ddb/ddb.h>
+#endif
+
+/*
+ * Note that stdarg.h and the ANSI style va_start macro is used for both
+ * ANSI and traditional C compilers.
+ */
+#include <machine/stdarg.h>
+
+#define TOCONS 0x01
+#define TOTTY 0x02
+#define TOLOG 0x04
+
+/* Max number conversion buffer length: a u_quad_t in base 2, plus NUL byte. */
+#define MAXNBUF (sizeof(intmax_t) * NBBY + 1)
+
+struct putchar_arg {
+ int flags;
+ int pri;
+ struct tty *tty;
+ char *p_bufr;
+ size_t n_bufr;
+ char *p_next;
+ size_t remain;
+};
+
+struct snprintf_arg {
+ char *str;
+ size_t remain;
+};
+
+extern int log_open;
+
+static void msglogchar(int c, int pri);
+static void msglogstr(char *str, int pri, int filter_cr);
+static void putchar(int ch, void *arg);
+static char *ksprintn(char *nbuf, uintmax_t num, int base, int *len, int upper);
+static void snprintf_func(int ch, void *arg);
+
+static int msgbufmapped; /* Set when safe to use msgbuf */
+int msgbuftrigger;
+
+static int log_console_output = 1;
+TUNABLE_INT("kern.log_console_output", &log_console_output);
+SYSCTL_INT(_kern, OID_AUTO, log_console_output, CTLFLAG_RW,
+ &log_console_output, 0, "Duplicate console output to the syslog.");
+
+/*
+ * See the comment in log_console() below for more explanation of this.
+ */
+static int log_console_add_linefeed = 0;
+TUNABLE_INT("kern.log_console_add_linefeed", &log_console_add_linefeed);
+SYSCTL_INT(_kern, OID_AUTO, log_console_add_linefeed, CTLFLAG_RW,
+ &log_console_add_linefeed, 0, "log_console() adds extra newlines.");
+
+static int always_console_output = 0;
+TUNABLE_INT("kern.always_console_output", &always_console_output);
+SYSCTL_INT(_kern, OID_AUTO, always_console_output, CTLFLAG_RW,
+ &always_console_output, 0, "Always output to console despite TIOCCONS.");
+
+/*
+ * Warn that a system table is full.
+ */
+void
+tablefull(const char *tab)
+{
+
+ log(LOG_ERR, "%s: table is full\n", tab);
+}
+
+/*
+ * Uprintf prints to the controlling terminal for the current process.
+ */
+int
+uprintf(const char *fmt, ...)
+{
+ va_list ap;
+ struct putchar_arg pca;
+ struct proc *p;
+ struct thread *td;
+ int retval;
+
+ td = curthread;
+ if (TD_IS_IDLETHREAD(td))
+ return (0);
+
+ sx_slock(&proctree_lock);
+ p = td->td_proc;
+ PROC_LOCK(p);
+ if ((p->p_flag & P_CONTROLT) == 0) {
+ PROC_UNLOCK(p);
+ sx_sunlock(&proctree_lock);
+ return (0);
+ }
+ SESS_LOCK(p->p_session);
+ pca.tty = p->p_session->s_ttyp;
+ SESS_UNLOCK(p->p_session);
+ PROC_UNLOCK(p);
+ if (pca.tty == NULL) {
+ sx_sunlock(&proctree_lock);
+ return (0);
+ }
+ pca.flags = TOTTY;
+ pca.p_bufr = NULL;
+ va_start(ap, fmt);
+ tty_lock(pca.tty);
+ sx_sunlock(&proctree_lock);
+ retval = kvprintf(fmt, putchar, &pca, 10, ap);
+ tty_unlock(pca.tty);
+ va_end(ap);
+ return (retval);
+}
+
+/*
+ * tprintf prints on the controlling terminal associated with the given
+ * session, possibly to the log as well.
+ */
+void
+tprintf(struct proc *p, int pri, const char *fmt, ...)
+{
+ struct tty *tp = NULL;
+ int flags = 0;
+ va_list ap;
+ struct putchar_arg pca;
+ struct session *sess = NULL;
+
+ sx_slock(&proctree_lock);
+ if (pri != -1)
+ flags |= TOLOG;
+ if (p != NULL) {
+ PROC_LOCK(p);
+ if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) {
+ sess = p->p_session;
+ sess_hold(sess);
+ PROC_UNLOCK(p);
+ tp = sess->s_ttyp;
+ if (tp != NULL && tty_checkoutq(tp))
+ flags |= TOTTY;
+ else
+ tp = NULL;
+ } else
+ PROC_UNLOCK(p);
+ }
+ pca.pri = pri;
+ pca.tty = tp;
+ pca.flags = flags;
+ pca.p_bufr = NULL;
+ va_start(ap, fmt);
+ if (pca.tty != NULL)
+ tty_lock(pca.tty);
+ sx_sunlock(&proctree_lock);
+ kvprintf(fmt, putchar, &pca, 10, ap);
+ if (pca.tty != NULL)
+ tty_unlock(pca.tty);
+ va_end(ap);
+ if (sess != NULL)
+ sess_release(sess);
+ msgbuftrigger = 1;
+}
+
+/*
+ * 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.
+ */
+int
+ttyprintf(struct tty *tp, const char *fmt, ...)
+{
+ va_list ap;
+ struct putchar_arg pca;
+ int retval;
+
+ va_start(ap, fmt);
+ pca.tty = tp;
+ pca.flags = TOTTY;
+ pca.p_bufr = NULL;
+ retval = kvprintf(fmt, putchar, &pca, 10, ap);
+ va_end(ap);
+ return (retval);
+}
+
+static int
+_vprintf(int level, int flags, const char *fmt, va_list ap)
+{
+ struct putchar_arg pca;
+ int retval;
+#ifdef PRINTF_BUFR_SIZE
+ char bufr[PRINTF_BUFR_SIZE];
+#endif
+
+ pca.tty = NULL;
+ pca.pri = level;
+ pca.flags = flags;
+#ifdef PRINTF_BUFR_SIZE
+ pca.p_bufr = bufr;
+ pca.p_next = pca.p_bufr;
+ pca.n_bufr = sizeof(bufr);
+ pca.remain = sizeof(bufr);
+ *pca.p_next = '\0';
+#else
+ /* Don't buffer console output. */
+ pca.p_bufr = NULL;
+#endif
+
+ retval = kvprintf(fmt, putchar, &pca, 10, ap);
+
+#ifdef PRINTF_BUFR_SIZE
+ /* Write any buffered console/log output: */
+ if (*pca.p_bufr != '\0') {
+ if (pca.flags & TOLOG)
+ msglogstr(pca.p_bufr, level, /*filter_cr*/1);
+
+ if (pca.flags & TOCONS)
+ cnputs(pca.p_bufr);
+ }
+#endif
+
+ return (retval);
+}
+
+/*
+ * 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
+log(int level, const char *fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ (void)_vprintf(level, log_open ? TOLOG : TOCONS, fmt, ap);
+ va_end(ap);
+
+ msgbuftrigger = 1;
+}
+
+#define CONSCHUNK 128
+
+void
+log_console(struct uio *uio)
+{
+ int c, error, nl;
+ char *consbuffer;
+ int pri;
+
+ if (!log_console_output)
+ return;
+
+ pri = LOG_INFO | LOG_CONSOLE;
+ uio = cloneuio(uio);
+ consbuffer = malloc(CONSCHUNK, M_TEMP, M_WAITOK);
+
+ nl = 0;
+ while (uio->uio_resid > 0) {
+ c = imin(uio->uio_resid, CONSCHUNK - 1);
+ error = uiomove(consbuffer, c, uio);
+ if (error != 0)
+ break;
+ /* Make sure we're NUL-terminated */
+ consbuffer[c] = '\0';
+ if (consbuffer[c - 1] == '\n')
+ nl = 1;
+ else
+ nl = 0;
+ msglogstr(consbuffer, pri, /*filter_cr*/ 1);
+ }
+ /*
+ * The previous behavior in log_console() is preserved when
+ * log_console_add_linefeed is non-zero. For that behavior, if an
+ * individual console write came in that was not terminated with a
+ * line feed, it would add a line feed.
+ *
+ * This results in different data in the message buffer than
+ * appears on the system console (which doesn't add extra line feed
+ * characters).
+ *
+ * A number of programs and rc scripts write a line feed, or a period
+ * and a line feed when they have completed their operation. On
+ * the console, this looks seamless, but when displayed with
+ * 'dmesg -a', you wind up with output that looks like this:
+ *
+ * Updating motd:
+ * .
+ *
+ * On the console, it looks like this:
+ * Updating motd:.
+ *
+ * We could add logic to detect that situation, or just not insert
+ * the extra newlines. Set the kern.log_console_add_linefeed
+ * sysctl/tunable variable to get the old behavior.
+ */
+ if (!nl && log_console_add_linefeed) {
+ consbuffer[0] = '\n';
+ consbuffer[1] = '\0';
+ msglogstr(consbuffer, pri, /*filter_cr*/ 1);
+ }
+ msgbuftrigger = 1;
+ free(uio, M_IOV);
+ free(consbuffer, M_TEMP);
+ return;
+}
+
+int
+printf(const char *fmt, ...)
+{
+ va_list ap;
+ int retval;
+
+ va_start(ap, fmt);
+ retval = vprintf(fmt, ap);
+ va_end(ap);
+
+ return (retval);
+}
+
+int
+vprintf(const char *fmt, va_list ap)
+{
+ int retval;
+
+ retval = _vprintf(-1, TOCONS | TOLOG, fmt, ap);
+
+ if (!panicstr)
+ msgbuftrigger = 1;
+
+ return (retval);
+}
+
+static void
+putbuf(int c, struct putchar_arg *ap)
+{
+ /* Check if no console output buffer was provided. */
+ if (ap->p_bufr == NULL) {
+ /* Output direct to the console. */
+ if (ap->flags & TOCONS)
+ cnputc(c);
+
+ if (ap->flags & TOLOG)
+ msglogchar(c, ap->pri);
+ } else {
+ /* Buffer the character: */
+ *ap->p_next++ = c;
+ ap->remain--;
+
+ /* Always leave the buffer zero terminated. */
+ *ap->p_next = '\0';
+
+ /* Check if the buffer needs to be flushed. */
+ if (ap->remain == 2 || c == '\n') {
+
+ if (ap->flags & TOLOG)
+ msglogstr(ap->p_bufr, ap->pri, /*filter_cr*/1);
+
+ if (ap->flags & TOCONS) {
+ if ((panicstr == NULL) && (constty != NULL))
+ msgbuf_addstr(&consmsgbuf, -1,
+ ap->p_bufr, /*filter_cr*/ 0);
+
+ if ((constty == NULL) ||(always_console_output))
+ cnputs(ap->p_bufr);
+ }
+
+ ap->p_next = ap->p_bufr;
+ ap->remain = ap->n_bufr;
+ *ap->p_next = '\0';
+ }
+
+ /*
+ * Since we fill the buffer up one character at a time,
+ * this should not happen. We should always catch it when
+ * ap->remain == 2 (if not sooner due to a newline), flush
+ * the buffer and move on. One way this could happen is
+ * if someone sets PRINTF_BUFR_SIZE to 1 or something
+ * similarly silly.
+ */
+ KASSERT(ap->remain > 2, ("Bad buffer logic, remain = %zd",
+ ap->remain));
+ }
+}
+
+/*
+ * Print a character on console or users terminal. If destination is
+ * the console then the last bunch of characters are saved in msgbuf for
+ * inspection later.
+ */
+static void
+putchar(int c, void *arg)
+{
+ struct putchar_arg *ap = (struct putchar_arg*) arg;
+ struct tty *tp = ap->tty;
+ int flags = ap->flags;
+ int putbuf_done = 0;
+
+ /* Don't use the tty code after a panic or while in ddb. */
+ if (kdb_active) {
+ if (c != '\0')
+ cnputc(c);
+ } else {
+ if ((panicstr == NULL) && (flags & TOTTY) && (tp != NULL))
+ tty_putchar(tp, c);
+
+ if (flags & TOCONS) {
+ putbuf(c, ap);
+ putbuf_done = 1;
+ }
+ }
+ if ((flags & TOLOG) && (putbuf_done == 0)) {
+ if (c != '\0')
+ putbuf(c, ap);
+ }
+}
+
+/*
+ * Scaled down version of sprintf(3).
+ */
+int
+sprintf(char *buf, const char *cfmt, ...)
+{
+ int retval;
+ va_list ap;
+
+ va_start(ap, cfmt);
+ retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
+ buf[retval] = '\0';
+ va_end(ap);
+ return (retval);
+}
+
+/*
+ * Scaled down version of vsprintf(3).
+ */
+int
+vsprintf(char *buf, const char *cfmt, va_list ap)
+{
+ int retval;
+
+ retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
+ buf[retval] = '\0';
+ return (retval);
+}
+
+/*
+ * Scaled down version of snprintf(3).
+ */
+int
+snprintf(char *str, size_t size, const char *format, ...)
+{
+ int retval;
+ va_list ap;
+
+ va_start(ap, format);
+ retval = vsnprintf(str, size, format, ap);
+ va_end(ap);
+ return(retval);
+}
+
+/*
+ * Scaled down version of vsnprintf(3).
+ */
+int
+vsnprintf(char *str, size_t size, const char *format, va_list ap)
+{
+ struct snprintf_arg info;
+ int retval;
+
+ info.str = str;
+ info.remain = size;
+ retval = kvprintf(format, snprintf_func, &info, 10, ap);
+ if (info.remain >= 1)
+ *info.str++ = '\0';
+ return (retval);
+}
+
+/*
+ * Kernel version which takes radix argument vsnprintf(3).
+ */
+int
+vsnrprintf(char *str, size_t size, int radix, const char *format, va_list ap)
+{
+ struct snprintf_arg info;
+ int retval;
+
+ info.str = str;
+ info.remain = size;
+ retval = kvprintf(format, snprintf_func, &info, radix, ap);
+ if (info.remain >= 1)
+ *info.str++ = '\0';
+ return (retval);
+}
+
+static void
+snprintf_func(int ch, void *arg)
+{
+ struct snprintf_arg *const info = arg;
+
+ if (info->remain >= 2) {
+ *info->str++ = ch;
+ info->remain--;
+ }
+}
+
+/*
+ * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse
+ * order; return an optional length and a pointer to the last character
+ * written in the buffer (i.e., the first character of the string).
+ * The buffer pointed to by `nbuf' must have length >= MAXNBUF.
+ */
+static char *
+ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper)
+{
+ char *p, c;
+
+ p = nbuf;
+ *p = '\0';
+ do {
+ c = hex2ascii(num % base);
+ *++p = upper ? toupper(c) : c;
+ } while (num /= base);
+ if (lenp)
+ *lenp = p - nbuf;
+ return (p);
+}
+
+/*
+ * 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:
+ *
+ * kvprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n");
+ *
+ * would produce output:
+ *
+ * reg=3<BITTWO,BITONE>
+ *
+ * XXX: %D -- Hexdump, takes pointer and separator string:
+ * ("%6D", ptr, ":") -> XX:XX:XX:XX:XX:XX
+ * ("%*D", len, ptr, " " -> XX XX XX XX ...
+ */
+int
+kvprintf(char const *fmt, void (*func)(int, void*), void *arg, int radix, va_list ap)
+{
+#define PCHAR(c) {int cc=(c); if (func) (*func)(cc,arg); else *d++ = cc; retval++; }
+ char nbuf[MAXNBUF];
+ char *d;
+ const char *p, *percent, *q;
+ u_char *up;
+ int ch, n;
+ uintmax_t num;
+ int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot;
+ int cflag, hflag, jflag, tflag, zflag;
+ int dwidth, upper;
+ char padc;
+ int stop = 0, retval = 0;
+
+ num = 0;
+ if (!func)
+ d = (char *) arg;
+ else
+ d = NULL;
+
+ if (fmt == NULL)
+ fmt = "(fmt null)\n";
+
+ if (radix < 2 || radix > 36)
+ radix = 10;
+
+ for (;;) {
+ padc = ' ';
+ width = 0;
+ while ((ch = (u_char)*fmt++) != '%' || stop) {
+ if (ch == '\0')
+ return (retval);
+ PCHAR(ch);
+ }
+ percent = fmt - 1;
+ qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0;
+ sign = 0; dot = 0; dwidth = 0; upper = 0;
+ cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 0;
+reswitch: switch (ch = (u_char)*fmt++) {
+ case '.':
+ dot = 1;
+ goto reswitch;
+ case '#':
+ sharpflag = 1;
+ goto reswitch;
+ case '+':
+ sign = 1;
+ goto reswitch;
+ case '-':
+ ladjust = 1;
+ goto reswitch;
+ case '%':
+ PCHAR(ch);
+ break;
+ case '*':
+ if (!dot) {
+ width = va_arg(ap, int);
+ if (width < 0) {
+ ladjust = !ladjust;
+ width = -width;
+ }
+ } else {
+ dwidth = va_arg(ap, int);
+ }
+ goto reswitch;
+ case '0':
+ if (!dot) {
+ padc = '0';
+ goto reswitch;
+ }
+ case '1': case '2': case '3': case '4':
+ case '5': case '6': case '7': case '8': case '9':
+ for (n = 0;; ++fmt) {
+ n = n * 10 + ch - '0';
+ ch = *fmt;
+ if (ch < '0' || ch > '9')
+ break;
+ }
+ if (dot)
+ dwidth = n;
+ else
+ width = n;
+ goto reswitch;
+ case 'b':
+ num = (u_int)va_arg(ap, int);
+ p = va_arg(ap, char *);
+ for (q = ksprintn(nbuf, num, *p++, NULL, 0); *q;)
+ PCHAR(*q--);
+
+ if (num == 0)
+ break;
+
+ for (tmp = 0; *p;) {
+ n = *p++;
+ if (num & (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':
+ case 'i':
+ base = 10;
+ sign = 1;
+ goto handle_sign;
+ case 'h':
+ if (hflag) {
+ hflag = 0;
+ cflag = 1;
+ } else
+ hflag = 1;
+ goto reswitch;
+ case 'j':
+ jflag = 1;
+ goto reswitch;
+ case 'l':
+ if (lflag) {
+ lflag = 0;
+ qflag = 1;
+ } else
+ lflag = 1;
+ goto reswitch;
+ case 'n':
+ if (jflag)
+ *(va_arg(ap, intmax_t *)) = retval;
+ else if (qflag)
+ *(va_arg(ap, quad_t *)) = retval;
+ else if (lflag)
+ *(va_arg(ap, long *)) = retval;
+ else if (zflag)
+ *(va_arg(ap, size_t *)) = retval;
+ else if (hflag)
+ *(va_arg(ap, short *)) = retval;
+ else if (cflag)
+ *(va_arg(ap, char *)) = retval;
+ else
+ *(va_arg(ap, int *)) = retval;
+ break;
+ case 'o':
+ base = 8;
+ goto handle_nosign;
+ case 'p':
+ base = 16;
+ sharpflag = (width == 0);
+ sign = 0;
+ num = (uintptr_t)va_arg(ap, void *);
+ goto number;
+ case 'q':
+ qflag = 1;
+ goto reswitch;
+ case 'r':
+ base = radix;
+ if (sign)
+ goto handle_sign;
+ goto handle_nosign;
+ 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 't':
+ tflag = 1;
+ goto reswitch;
+ case 'u':
+ base = 10;
+ goto handle_nosign;
+ case 'X':
+ upper = 1;
+ case 'x':
+ base = 16;
+ goto handle_nosign;
+ case 'y':
+ base = 16;
+ sign = 1;
+ goto handle_sign;
+ case 'z':
+ zflag = 1;
+ goto reswitch;
+handle_nosign:
+ sign = 0;
+ if (jflag)
+ num = va_arg(ap, uintmax_t);
+ else if (qflag)
+ num = va_arg(ap, u_quad_t);
+ else if (tflag)
+ num = va_arg(ap, ptrdiff_t);
+ else if (lflag)
+ num = va_arg(ap, u_long);
+ else if (zflag)
+ num = va_arg(ap, size_t);
+ else if (hflag)
+ num = (u_short)va_arg(ap, int);
+ else if (cflag)
+ num = (u_char)va_arg(ap, int);
+ else
+ num = va_arg(ap, u_int);
+ goto number;
+handle_sign:
+ if (jflag)
+ num = va_arg(ap, intmax_t);
+ else if (qflag)
+ num = va_arg(ap, quad_t);
+ else if (tflag)
+ num = va_arg(ap, ptrdiff_t);
+ else if (lflag)
+ num = va_arg(ap, long);
+ else if (zflag)
+ num = va_arg(ap, ssize_t);
+ else if (hflag)
+ num = (short)va_arg(ap, int);
+ else if (cflag)
+ num = (char)va_arg(ap, int);
+ else
+ num = va_arg(ap, int);
+number:
+ if (sign && (intmax_t)num < 0) {
+ neg = 1;
+ num = -(intmax_t)num;
+ }
+ p = ksprintn(nbuf, num, base, &n, upper);
+ tmp = 0;
+ if (sharpflag && num != 0) {
+ if (base == 8)
+ tmp++;
+ else if (base == 16)
+ tmp += 2;
+ }
+ if (neg)
+ tmp++;
+
+ if (!ladjust && padc == '0')
+ dwidth = width - tmp;
+ width -= tmp + imax(dwidth, n);
+ dwidth -= n;
+ if (!ladjust)
+ while (width-- > 0)
+ PCHAR(' ');
+ if (neg)
+ PCHAR('-');
+ if (sharpflag && num != 0) {
+ if (base == 8) {
+ PCHAR('0');
+ } else if (base == 16) {
+ PCHAR('0');
+ PCHAR('x');
+ }
+ }
+ while (dwidth-- > 0)
+ PCHAR('0');
+
+ while (*p)
+ PCHAR(*p--);
+
+ if (ladjust)
+ while (width-- > 0)
+ PCHAR(' ');
+
+ break;
+ default:
+ while (percent < fmt)
+ PCHAR(*percent++);
+ /*
+ * Since we ignore an formatting argument it is no
+ * longer safe to obey the remaining formatting
+ * arguments as the arguments will no longer match
+ * the format specs.
+ */
+ stop = 1;
+ break;
+ }
+ }
+#undef PCHAR
+}
+
+/*
+ * Put character in log buffer with a particular priority.
+ */
+static void
+msglogchar(int c, int pri)
+{
+ static int lastpri = -1;
+ static int dangling;
+ char nbuf[MAXNBUF];
+ char *p;
+
+ if (!msgbufmapped)
+ return;
+ if (c == '\0' || c == '\r')
+ return;
+ if (pri != -1 && pri != lastpri) {
+ if (dangling) {
+ msgbuf_addchar(msgbufp, '\n');
+ dangling = 0;
+ }
+ msgbuf_addchar(msgbufp, '<');
+ for (p = ksprintn(nbuf, (uintmax_t)pri, 10, NULL, 0); *p;)
+ msgbuf_addchar(msgbufp, *p--);
+ msgbuf_addchar(msgbufp, '>');
+ lastpri = pri;
+ }
+ msgbuf_addchar(msgbufp, c);
+ if (c == '\n') {
+ dangling = 0;
+ lastpri = -1;
+ } else {
+ dangling = 1;
+ }
+}
+
+static void
+msglogstr(char *str, int pri, int filter_cr)
+{
+ if (!msgbufmapped)
+ return;
+
+ msgbuf_addstr(msgbufp, pri, str, filter_cr);
+}
+
+void
+msgbufinit(void *ptr, int size)
+{
+ char *cp;
+ static struct msgbuf *oldp = NULL;
+
+ size -= sizeof(*msgbufp);
+ cp = (char *)ptr;
+ msgbufp = (struct msgbuf *)(cp + size);
+ msgbuf_reinit(msgbufp, cp, size);
+ if (msgbufmapped && oldp != msgbufp)
+ msgbuf_copy(oldp, msgbufp);
+ msgbufmapped = 1;
+ oldp = msgbufp;
+}
+
+static int unprivileged_read_msgbuf = 1;
+SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_read_msgbuf,
+ CTLFLAG_RW, &unprivileged_read_msgbuf, 0,
+ "Unprivileged processes may read the kernel message buffer");
+
+/* Sysctls for accessing/clearing the msgbuf */
+static int
+sysctl_kern_msgbuf(SYSCTL_HANDLER_ARGS)
+{
+ char buf[128];
+ u_int seq;
+ int error, len;
+
+ if (!unprivileged_read_msgbuf) {
+ error = priv_check(req->td, PRIV_MSGBUF);
+ if (error)
+ return (error);
+ }
+
+ /* Read the whole buffer, one chunk at a time. */
+ mtx_lock(&msgbuf_lock);
+ msgbuf_peekbytes(msgbufp, NULL, 0, &seq);
+ for (;;) {
+ len = msgbuf_peekbytes(msgbufp, buf, sizeof(buf), &seq);
+ mtx_unlock(&msgbuf_lock);
+ if (len == 0)
+ return (0);
+
+ error = sysctl_handle_opaque(oidp, buf, len, req);
+ if (error)
+ return (error);
+
+ mtx_lock(&msgbuf_lock);
+ }
+}
+
+SYSCTL_PROC(_kern, OID_AUTO, msgbuf,
+ CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE,
+ NULL, 0, sysctl_kern_msgbuf, "A", "Contents of kernel message buffer");
+
+static int msgbuf_clearflag;
+
+static int
+sysctl_kern_msgbuf_clear(SYSCTL_HANDLER_ARGS)
+{
+ int error;
+ error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req);
+ if (!error && req->newptr) {
+ mtx_lock(&msgbuf_lock);
+ msgbuf_clear(msgbufp);
+ mtx_unlock(&msgbuf_lock);
+ msgbuf_clearflag = 0;
+ }
+ return (error);
+}
+
+SYSCTL_PROC(_kern, OID_AUTO, msgbuf_clear,
+ CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE | CTLFLAG_MPSAFE,
+ &msgbuf_clearflag, 0, sysctl_kern_msgbuf_clear, "I",
+ "Clear kernel message buffer");
+
+#ifdef DDB
+
+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= %u, w = %u, ptr = %p, cksum= %u\n",
+ msgbufp->msg_magic, msgbufp->msg_size, msgbufp->msg_rseq,
+ msgbufp->msg_wseq, msgbufp->msg_ptr, msgbufp->msg_cksum);
+ for (i = 0; i < msgbufp->msg_size && !db_pager_quit; i++) {
+ j = MSGBUF_SEQ_TO_POS(msgbufp, i + msgbufp->msg_rseq);
+ db_printf("%c", msgbufp->msg_ptr[j]);
+ }
+ db_printf("\n");
+}
+
+#endif /* DDB */
+
+void
+hexdump(const void *ptr, int length, const char *hdr, int flags)
+{
+ int i, j, k;
+ int cols;
+ const unsigned char *cp;
+ char delim;
+
+ if ((flags & HD_DELIM_MASK) != 0)
+ delim = (flags & HD_DELIM_MASK) >> 8;
+ else
+ delim = ' ';
+
+ if ((flags & HD_COLUMN_MASK) != 0)
+ cols = flags & HD_COLUMN_MASK;
+ else
+ cols = 16;
+
+ cp = ptr;
+ for (i = 0; i < length; i+= cols) {
+ if (hdr != NULL)
+ printf("%s", hdr);
+
+ if ((flags & HD_OMIT_COUNT) == 0)
+ printf("%04x ", i);
+
+ if ((flags & HD_OMIT_HEX) == 0) {
+ for (j = 0; j < cols; j++) {
+ k = i + j;
+ if (k < length)
+ printf("%c%02x", delim, cp[k]);
+ else
+ printf(" ");
+ }
+ }
+
+ if ((flags & HD_OMIT_CHARS) == 0) {
+ printf(" |");
+ for (j = 0; j < cols; j++) {
+ k = i + j;
+ if (k >= length)
+ printf(" ");
+ else if (cp[k] >= ' ' && cp[k] <= '~')
+ printf("%c", cp[k]);
+ else
+ printf(".");
+ }
+ printf("|");
+ }
+ printf("\n");
+ }
+}
+
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