The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_prf.c

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    1 /*-
    2  * Copyright (c) 1986, 1988, 1991, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  * (c) UNIX System Laboratories, Inc.
    5  * All or some portions of this file are derived from material licensed
    6  * to the University of California by American Telephone and Telegraph
    7  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
    8  * the permission of UNIX System Laboratories, Inc.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 4. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      @(#)subr_prf.c  8.3 (Berkeley) 1/21/94
   35  */
   36 
   37 #include <sys/cdefs.h>
   38 __FBSDID("$FreeBSD: releng/8.3/sys/kern/subr_prf.c 210305 2010-07-20 18:55:13Z jkim $");
   39 
   40 #include "opt_ddb.h"
   41 #include "opt_printf.h"
   42 
   43 #include <sys/param.h>
   44 #include <sys/systm.h>
   45 #include <sys/lock.h>
   46 #include <sys/kdb.h>
   47 #include <sys/mutex.h>
   48 #include <sys/sx.h>
   49 #include <sys/kernel.h>
   50 #include <sys/msgbuf.h>
   51 #include <sys/malloc.h>
   52 #include <sys/priv.h>
   53 #include <sys/proc.h>
   54 #include <sys/stddef.h>
   55 #include <sys/sysctl.h>
   56 #include <sys/tty.h>
   57 #include <sys/syslog.h>
   58 #include <sys/cons.h>
   59 #include <sys/uio.h>
   60 #include <sys/ctype.h>
   61 
   62 #ifdef DDB
   63 #include <ddb/ddb.h>
   64 #endif
   65 
   66 /*
   67  * Note that stdarg.h and the ANSI style va_start macro is used for both
   68  * ANSI and traditional C compilers.
   69  */
   70 #include <machine/stdarg.h>
   71 
   72 #define TOCONS  0x01
   73 #define TOTTY   0x02
   74 #define TOLOG   0x04
   75 
   76 /* Max number conversion buffer length: a u_quad_t in base 2, plus NUL byte. */
   77 #define MAXNBUF (sizeof(intmax_t) * NBBY + 1)
   78 
   79 struct putchar_arg {
   80         int     flags;
   81         int     pri;
   82         struct  tty *tty;
   83         char    *p_bufr;
   84         size_t  n_bufr;
   85         char    *p_next;
   86         size_t  remain;
   87 };
   88 
   89 struct snprintf_arg {
   90         char    *str;
   91         size_t  remain;
   92 };
   93 
   94 extern  int log_open;
   95 
   96 static void  msglogchar(int c, int pri);
   97 static void  putchar(int ch, void *arg);
   98 static char *ksprintn(char *nbuf, uintmax_t num, int base, int *len, int upper);
   99 static void  snprintf_func(int ch, void *arg);
  100 
  101 static int msgbufmapped;                /* Set when safe to use msgbuf */
  102 int msgbuftrigger;
  103 
  104 static int      log_console_output = 1;
  105 TUNABLE_INT("kern.log_console_output", &log_console_output);
  106 SYSCTL_INT(_kern, OID_AUTO, log_console_output, CTLFLAG_RW,
  107     &log_console_output, 0, "Duplicate console output to the syslog.");
  108 
  109 static int      always_console_output = 0;
  110 TUNABLE_INT("kern.always_console_output", &always_console_output);
  111 SYSCTL_INT(_kern, OID_AUTO, always_console_output, CTLFLAG_RW,
  112     &always_console_output, 0, "Always output to console despite TIOCCONS.");
  113 
  114 /*
  115  * Warn that a system table is full.
  116  */
  117 void
  118 tablefull(const char *tab)
  119 {
  120 
  121         log(LOG_ERR, "%s: table is full\n", tab);
  122 }
  123 
  124 /*
  125  * Uprintf prints to the controlling terminal for the current process.
  126  */
  127 int
  128 uprintf(const char *fmt, ...)
  129 {
  130         va_list ap;
  131         struct putchar_arg pca;
  132         struct proc *p;
  133         struct thread *td;
  134         int retval;
  135 
  136         td = curthread;
  137         if (TD_IS_IDLETHREAD(td))
  138                 return (0);
  139 
  140         sx_slock(&proctree_lock);
  141         p = td->td_proc;
  142         PROC_LOCK(p);
  143         if ((p->p_flag & P_CONTROLT) == 0) {
  144                 PROC_UNLOCK(p);
  145                 retval = 0;
  146                 goto out;
  147         }
  148         SESS_LOCK(p->p_session);
  149         pca.tty = p->p_session->s_ttyp;
  150         SESS_UNLOCK(p->p_session);
  151         PROC_UNLOCK(p);
  152         if (pca.tty == NULL) {
  153                 retval = 0;
  154                 goto out;
  155         }
  156         pca.flags = TOTTY;
  157         va_start(ap, fmt);
  158         tty_lock(pca.tty);
  159         retval = kvprintf(fmt, putchar, &pca, 10, ap);
  160         tty_unlock(pca.tty);
  161         va_end(ap);
  162 out:
  163         sx_sunlock(&proctree_lock);
  164         return (retval);
  165 }
  166 
  167 /*
  168  * tprintf prints on the controlling terminal associated with the given
  169  * session, possibly to the log as well.
  170  */
  171 void
  172 tprintf(struct proc *p, int pri, const char *fmt, ...)
  173 {
  174         struct tty *tp = NULL;
  175         int flags = 0;
  176         va_list ap;
  177         struct putchar_arg pca;
  178         struct session *sess = NULL;
  179 
  180         sx_slock(&proctree_lock);
  181         if (pri != -1)
  182                 flags |= TOLOG;
  183         if (p != NULL) {
  184                 PROC_LOCK(p);
  185                 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) {
  186                         sess = p->p_session;
  187                         sess_hold(sess);
  188                         PROC_UNLOCK(p);
  189                         tp = sess->s_ttyp;
  190                         if (tp != NULL && tty_checkoutq(tp))
  191                                 flags |= TOTTY;
  192                         else
  193                                 tp = NULL;
  194                 } else
  195                         PROC_UNLOCK(p);
  196         }
  197         pca.pri = pri;
  198         pca.tty = tp;
  199         pca.flags = flags;
  200         va_start(ap, fmt);
  201         if (pca.tty != NULL)
  202                 tty_lock(pca.tty);
  203         kvprintf(fmt, putchar, &pca, 10, ap);
  204         if (pca.tty != NULL)
  205                 tty_unlock(pca.tty);
  206         va_end(ap);
  207         if (sess != NULL)
  208                 sess_release(sess);
  209         msgbuftrigger = 1;
  210         sx_sunlock(&proctree_lock);
  211 }
  212 
  213 /*
  214  * Ttyprintf displays a message on a tty; it should be used only by
  215  * the tty driver, or anything that knows the underlying tty will not
  216  * be revoke(2)'d away.  Other callers should use tprintf.
  217  */
  218 int
  219 ttyprintf(struct tty *tp, const char *fmt, ...)
  220 {
  221         va_list ap;
  222         struct putchar_arg pca;
  223         int retval;
  224 
  225         va_start(ap, fmt);
  226         pca.tty = tp;
  227         pca.flags = TOTTY;
  228         retval = kvprintf(fmt, putchar, &pca, 10, ap);
  229         va_end(ap);
  230         return (retval);
  231 }
  232 
  233 /*
  234  * Log writes to the log buffer, and guarantees not to sleep (so can be
  235  * called by interrupt routines).  If there is no process reading the
  236  * log yet, it writes to the console also.
  237  */
  238 void
  239 log(int level, const char *fmt, ...)
  240 {
  241         va_list ap;
  242         struct putchar_arg pca;
  243 
  244         pca.tty = NULL;
  245         pca.pri = level;
  246         pca.flags = log_open ? TOLOG : TOCONS;
  247         pca.p_bufr = NULL;
  248 
  249         va_start(ap, fmt);
  250         kvprintf(fmt, putchar, &pca, 10, ap);
  251         va_end(ap);
  252 
  253         msgbuftrigger = 1;
  254 }
  255 
  256 #define CONSCHUNK 128
  257 
  258 void
  259 log_console(struct uio *uio)
  260 {
  261         int c, i, error, nl;
  262         char *consbuffer;
  263         int pri;
  264 
  265         if (!log_console_output)
  266                 return;
  267 
  268         pri = LOG_INFO | LOG_CONSOLE;
  269         uio = cloneuio(uio);
  270         consbuffer = malloc(CONSCHUNK, M_TEMP, M_WAITOK);
  271 
  272         nl = 0;
  273         while (uio->uio_resid > 0) {
  274                 c = imin(uio->uio_resid, CONSCHUNK);
  275                 error = uiomove(consbuffer, c, uio);
  276                 if (error != 0)
  277                         break;
  278                 for (i = 0; i < c; i++) {
  279                         msglogchar(consbuffer[i], pri);
  280                         if (consbuffer[i] == '\n')
  281                                 nl = 1;
  282                         else
  283                                 nl = 0;
  284                 }
  285         }
  286         if (!nl)
  287                 msglogchar('\n', pri);
  288         msgbuftrigger = 1;
  289         free(uio, M_IOV);
  290         free(consbuffer, M_TEMP);
  291         return;
  292 }
  293 
  294 int
  295 printf(const char *fmt, ...)
  296 {
  297         va_list ap;
  298         int retval;
  299 
  300         va_start(ap, fmt);
  301         retval = vprintf(fmt, ap);
  302         va_end(ap);
  303 
  304         return (retval);
  305 }
  306 
  307 int
  308 vprintf(const char *fmt, va_list ap)
  309 {
  310         struct putchar_arg pca;
  311         int retval;
  312 #ifdef PRINTF_BUFR_SIZE
  313         char bufr[PRINTF_BUFR_SIZE];
  314 #endif
  315 
  316         pca.tty = NULL;
  317         pca.flags = TOCONS | TOLOG;
  318         pca.pri = -1;
  319 #ifdef PRINTF_BUFR_SIZE
  320         pca.p_bufr = bufr;
  321         pca.p_next = pca.p_bufr;
  322         pca.n_bufr = sizeof(bufr);
  323         pca.remain = sizeof(bufr);
  324         *pca.p_next = '\0';
  325 #else
  326         /* Don't buffer console output. */
  327         pca.p_bufr = NULL;
  328 #endif
  329 
  330         retval = kvprintf(fmt, putchar, &pca, 10, ap);
  331 
  332 #ifdef PRINTF_BUFR_SIZE
  333         /* Write any buffered console output: */
  334         if (*pca.p_bufr != '\0')
  335                 cnputs(pca.p_bufr);
  336 #endif
  337 
  338         if (!panicstr)
  339                 msgbuftrigger = 1;
  340 
  341         return (retval);
  342 }
  343 
  344 static void
  345 putcons(int c, struct putchar_arg *ap)
  346 {
  347         /* Check if no console output buffer was provided. */
  348         if (ap->p_bufr == NULL)
  349                 /* Output direct to the console. */
  350                 cnputc(c);
  351         else {
  352                 /* Buffer the character: */
  353                 if (c == '\n') {
  354                         *ap->p_next++ = '\r';
  355                         ap->remain--;
  356                 }
  357                 *ap->p_next++ = c;
  358                 ap->remain--;
  359 
  360                 /* Always leave the buffer zero terminated. */
  361                 *ap->p_next = '\0';
  362 
  363                 /* Check if the buffer needs to be flushed. */
  364                 if (ap->remain < 3 || c == '\n') {
  365                         cnputs(ap->p_bufr);
  366                         ap->p_next = ap->p_bufr;
  367                         ap->remain = ap->n_bufr;
  368                         *ap->p_next = '\0';
  369                 }
  370         }
  371 }
  372 
  373 /*
  374  * Print a character on console or users terminal.  If destination is
  375  * the console then the last bunch of characters are saved in msgbuf for
  376  * inspection later.
  377  */
  378 static void
  379 putchar(int c, void *arg)
  380 {
  381         struct putchar_arg *ap = (struct putchar_arg*) arg;
  382         struct tty *tp = ap->tty;
  383         int flags = ap->flags;
  384 
  385         /* Don't use the tty code after a panic or while in ddb. */
  386         if (kdb_active) {
  387                 if (c != '\0')
  388                         cnputc(c);
  389         } else if (panicstr || ((flags & TOCONS) && constty == NULL)) {
  390                 if (c != '\0')
  391                         putcons(c, ap);
  392         } else {
  393                 if ((flags & TOTTY) && tp != NULL)
  394                         tty_putchar(tp, c);
  395                 if (flags & TOCONS) {
  396                         if (constty != NULL)
  397                                 msgbuf_addchar(&consmsgbuf, c);
  398                         if (always_console_output && c != '\0')
  399                                 putcons(c, ap);
  400                 }
  401         }
  402         if ((flags & TOLOG))
  403                 msglogchar(c, ap->pri);
  404 }
  405 
  406 /*
  407  * Scaled down version of sprintf(3).
  408  */
  409 int
  410 sprintf(char *buf, const char *cfmt, ...)
  411 {
  412         int retval;
  413         va_list ap;
  414 
  415         va_start(ap, cfmt);
  416         retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
  417         buf[retval] = '\0';
  418         va_end(ap);
  419         return (retval);
  420 }
  421 
  422 /*
  423  * Scaled down version of vsprintf(3).
  424  */
  425 int
  426 vsprintf(char *buf, const char *cfmt, va_list ap)
  427 {
  428         int retval;
  429 
  430         retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
  431         buf[retval] = '\0';
  432         return (retval);
  433 }
  434 
  435 /*
  436  * Scaled down version of snprintf(3).
  437  */
  438 int
  439 snprintf(char *str, size_t size, const char *format, ...)
  440 {
  441         int retval;
  442         va_list ap;
  443 
  444         va_start(ap, format);
  445         retval = vsnprintf(str, size, format, ap);
  446         va_end(ap);
  447         return(retval);
  448 }
  449 
  450 /*
  451  * Scaled down version of vsnprintf(3).
  452  */
  453 int
  454 vsnprintf(char *str, size_t size, const char *format, va_list ap)
  455 {
  456         struct snprintf_arg info;
  457         int retval;
  458 
  459         info.str = str;
  460         info.remain = size;
  461         retval = kvprintf(format, snprintf_func, &info, 10, ap);
  462         if (info.remain >= 1)
  463                 *info.str++ = '\0';
  464         return (retval);
  465 }
  466 
  467 /*
  468  * Kernel version which takes radix argument vsnprintf(3).
  469  */
  470 int
  471 vsnrprintf(char *str, size_t size, int radix, const char *format, va_list ap)
  472 {
  473         struct snprintf_arg info;
  474         int retval;
  475 
  476         info.str = str;
  477         info.remain = size;
  478         retval = kvprintf(format, snprintf_func, &info, radix, ap);
  479         if (info.remain >= 1)
  480                 *info.str++ = '\0';
  481         return (retval);
  482 }
  483 
  484 static void
  485 snprintf_func(int ch, void *arg)
  486 {
  487         struct snprintf_arg *const info = arg;
  488 
  489         if (info->remain >= 2) {
  490                 *info->str++ = ch;
  491                 info->remain--;
  492         }
  493 }
  494 
  495 /*
  496  * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse
  497  * order; return an optional length and a pointer to the last character
  498  * written in the buffer (i.e., the first character of the string).
  499  * The buffer pointed to by `nbuf' must have length >= MAXNBUF.
  500  */
  501 static char *
  502 ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper)
  503 {
  504         char *p, c;
  505 
  506         p = nbuf;
  507         *p = '\0';
  508         do {
  509                 c = hex2ascii(num % base);
  510                 *++p = upper ? toupper(c) : c;
  511         } while (num /= base);
  512         if (lenp)
  513                 *lenp = p - nbuf;
  514         return (p);
  515 }
  516 
  517 /*
  518  * Scaled down version of printf(3).
  519  *
  520  * Two additional formats:
  521  *
  522  * The format %b is supported to decode error registers.
  523  * Its usage is:
  524  *
  525  *      printf("reg=%b\n", regval, "<base><arg>*");
  526  *
  527  * where <base> is the output base expressed as a control character, e.g.
  528  * \10 gives octal; \20 gives hex.  Each arg is a sequence of characters,
  529  * the first of which gives the bit number to be inspected (origin 1), and
  530  * the next characters (up to a control character, i.e. a character <= 32),
  531  * give the name of the register.  Thus:
  532  *
  533  *      kvprintf("reg=%b\n", 3, "\1\2BITTWO\1BITONE\n");
  534  *
  535  * would produce output:
  536  *
  537  *      reg=3<BITTWO,BITONE>
  538  *
  539  * XXX:  %D  -- Hexdump, takes pointer and separator string:
  540  *              ("%6D", ptr, ":")   -> XX:XX:XX:XX:XX:XX
  541  *              ("%*D", len, ptr, " " -> XX XX XX XX ...
  542  */
  543 int
  544 kvprintf(char const *fmt, void (*func)(int, void*), void *arg, int radix, va_list ap)
  545 {
  546 #define PCHAR(c) {int cc=(c); if (func) (*func)(cc,arg); else *d++ = cc; retval++; }
  547         char nbuf[MAXNBUF];
  548         char *d;
  549         const char *p, *percent, *q;
  550         u_char *up;
  551         int ch, n;
  552         uintmax_t num;
  553         int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot;
  554         int cflag, hflag, jflag, tflag, zflag;
  555         int dwidth, upper;
  556         char padc;
  557         int stop = 0, retval = 0;
  558 
  559         num = 0;
  560         if (!func)
  561                 d = (char *) arg;
  562         else
  563                 d = NULL;
  564 
  565         if (fmt == NULL)
  566                 fmt = "(fmt null)\n";
  567 
  568         if (radix < 2 || radix > 36)
  569                 radix = 10;
  570 
  571         for (;;) {
  572                 padc = ' ';
  573                 width = 0;
  574                 while ((ch = (u_char)*fmt++) != '%' || stop) {
  575                         if (ch == '\0')
  576                                 return (retval);
  577                         PCHAR(ch);
  578                 }
  579                 percent = fmt - 1;
  580                 qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0;
  581                 sign = 0; dot = 0; dwidth = 0; upper = 0;
  582                 cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 0;
  583 reswitch:       switch (ch = (u_char)*fmt++) {
  584                 case '.':
  585                         dot = 1;
  586                         goto reswitch;
  587                 case '#':
  588                         sharpflag = 1;
  589                         goto reswitch;
  590                 case '+':
  591                         sign = 1;
  592                         goto reswitch;
  593                 case '-':
  594                         ladjust = 1;
  595                         goto reswitch;
  596                 case '%':
  597                         PCHAR(ch);
  598                         break;
  599                 case '*':
  600                         if (!dot) {
  601                                 width = va_arg(ap, int);
  602                                 if (width < 0) {
  603                                         ladjust = !ladjust;
  604                                         width = -width;
  605                                 }
  606                         } else {
  607                                 dwidth = va_arg(ap, int);
  608                         }
  609                         goto reswitch;
  610                 case '':
  611                         if (!dot) {
  612                                 padc = '';
  613                                 goto reswitch;
  614                         }
  615                 case '1': case '2': case '3': case '4':
  616                 case '5': case '6': case '7': case '8': case '9':
  617                                 for (n = 0;; ++fmt) {
  618                                         n = n * 10 + ch - '';
  619                                         ch = *fmt;
  620                                         if (ch < '' || ch > '9')
  621                                                 break;
  622                                 }
  623                         if (dot)
  624                                 dwidth = n;
  625                         else
  626                                 width = n;
  627                         goto reswitch;
  628                 case 'b':
  629                         num = (u_int)va_arg(ap, int);
  630                         p = va_arg(ap, char *);
  631                         for (q = ksprintn(nbuf, num, *p++, NULL, 0); *q;)
  632                                 PCHAR(*q--);
  633 
  634                         if (num == 0)
  635                                 break;
  636 
  637                         for (tmp = 0; *p;) {
  638                                 n = *p++;
  639                                 if (num & (1 << (n - 1))) {
  640                                         PCHAR(tmp ? ',' : '<');
  641                                         for (; (n = *p) > ' '; ++p)
  642                                                 PCHAR(n);
  643                                         tmp = 1;
  644                                 } else
  645                                         for (; *p > ' '; ++p)
  646                                                 continue;
  647                         }
  648                         if (tmp)
  649                                 PCHAR('>');
  650                         break;
  651                 case 'c':
  652                         PCHAR(va_arg(ap, int));
  653                         break;
  654                 case 'D':
  655                         up = va_arg(ap, u_char *);
  656                         p = va_arg(ap, char *);
  657                         if (!width)
  658                                 width = 16;
  659                         while(width--) {
  660                                 PCHAR(hex2ascii(*up >> 4));
  661                                 PCHAR(hex2ascii(*up & 0x0f));
  662                                 up++;
  663                                 if (width)
  664                                         for (q=p;*q;q++)
  665                                                 PCHAR(*q);
  666                         }
  667                         break;
  668                 case 'd':
  669                 case 'i':
  670                         base = 10;
  671                         sign = 1;
  672                         goto handle_sign;
  673                 case 'h':
  674                         if (hflag) {
  675                                 hflag = 0;
  676                                 cflag = 1;
  677                         } else
  678                                 hflag = 1;
  679                         goto reswitch;
  680                 case 'j':
  681                         jflag = 1;
  682                         goto reswitch;
  683                 case 'l':
  684                         if (lflag) {
  685                                 lflag = 0;
  686                                 qflag = 1;
  687                         } else
  688                                 lflag = 1;
  689                         goto reswitch;
  690                 case 'n':
  691                         if (jflag)
  692                                 *(va_arg(ap, intmax_t *)) = retval;
  693                         else if (qflag)
  694                                 *(va_arg(ap, quad_t *)) = retval;
  695                         else if (lflag)
  696                                 *(va_arg(ap, long *)) = retval;
  697                         else if (zflag)
  698                                 *(va_arg(ap, size_t *)) = retval;
  699                         else if (hflag)
  700                                 *(va_arg(ap, short *)) = retval;
  701                         else if (cflag)
  702                                 *(va_arg(ap, char *)) = retval;
  703                         else
  704                                 *(va_arg(ap, int *)) = retval;
  705                         break;
  706                 case 'o':
  707                         base = 8;
  708                         goto handle_nosign;
  709                 case 'p':
  710                         base = 16;
  711                         sharpflag = (width == 0);
  712                         sign = 0;
  713                         num = (uintptr_t)va_arg(ap, void *);
  714                         goto number;
  715                 case 'q':
  716                         qflag = 1;
  717                         goto reswitch;
  718                 case 'r':
  719                         base = radix;
  720                         if (sign)
  721                                 goto handle_sign;
  722                         goto handle_nosign;
  723                 case 's':
  724                         p = va_arg(ap, char *);
  725                         if (p == NULL)
  726                                 p = "(null)";
  727                         if (!dot)
  728                                 n = strlen (p);
  729                         else
  730                                 for (n = 0; n < dwidth && p[n]; n++)
  731                                         continue;
  732 
  733                         width -= n;
  734 
  735                         if (!ladjust && width > 0)
  736                                 while (width--)
  737                                         PCHAR(padc);
  738                         while (n--)
  739                                 PCHAR(*p++);
  740                         if (ladjust && width > 0)
  741                                 while (width--)
  742                                         PCHAR(padc);
  743                         break;
  744                 case 't':
  745                         tflag = 1;
  746                         goto reswitch;
  747                 case 'u':
  748                         base = 10;
  749                         goto handle_nosign;
  750                 case 'X':
  751                         upper = 1;
  752                 case 'x':
  753                         base = 16;
  754                         goto handle_nosign;
  755                 case 'y':
  756                         base = 16;
  757                         sign = 1;
  758                         goto handle_sign;
  759                 case 'z':
  760                         zflag = 1;
  761                         goto reswitch;
  762 handle_nosign:
  763                         sign = 0;
  764                         if (jflag)
  765                                 num = va_arg(ap, uintmax_t);
  766                         else if (qflag)
  767                                 num = va_arg(ap, u_quad_t);
  768                         else if (tflag)
  769                                 num = va_arg(ap, ptrdiff_t);
  770                         else if (lflag)
  771                                 num = va_arg(ap, u_long);
  772                         else if (zflag)
  773                                 num = va_arg(ap, size_t);
  774                         else if (hflag)
  775                                 num = (u_short)va_arg(ap, int);
  776                         else if (cflag)
  777                                 num = (u_char)va_arg(ap, int);
  778                         else
  779                                 num = va_arg(ap, u_int);
  780                         goto number;
  781 handle_sign:
  782                         if (jflag)
  783                                 num = va_arg(ap, intmax_t);
  784                         else if (qflag)
  785                                 num = va_arg(ap, quad_t);
  786                         else if (tflag)
  787                                 num = va_arg(ap, ptrdiff_t);
  788                         else if (lflag)
  789                                 num = va_arg(ap, long);
  790                         else if (zflag)
  791                                 num = va_arg(ap, ssize_t);
  792                         else if (hflag)
  793                                 num = (short)va_arg(ap, int);
  794                         else if (cflag)
  795                                 num = (char)va_arg(ap, int);
  796                         else
  797                                 num = va_arg(ap, int);
  798 number:
  799                         if (sign && (intmax_t)num < 0) {
  800                                 neg = 1;
  801                                 num = -(intmax_t)num;
  802                         }
  803                         p = ksprintn(nbuf, num, base, &n, upper);
  804                         tmp = 0;
  805                         if (sharpflag && num != 0) {
  806                                 if (base == 8)
  807                                         tmp++;
  808                                 else if (base == 16)
  809                                         tmp += 2;
  810                         }
  811                         if (neg)
  812                                 tmp++;
  813 
  814                         if (!ladjust && padc == '')
  815                                 dwidth = width - tmp;
  816                         width -= tmp + imax(dwidth, n);
  817                         dwidth -= n;
  818                         if (!ladjust)
  819                                 while (width-- > 0)
  820                                         PCHAR(' ');
  821                         if (neg)
  822                                 PCHAR('-');
  823                         if (sharpflag && num != 0) {
  824                                 if (base == 8) {
  825                                         PCHAR('');
  826                                 } else if (base == 16) {
  827                                         PCHAR('');
  828                                         PCHAR('x');
  829                                 }
  830                         }
  831                         while (dwidth-- > 0)
  832                                 PCHAR('');
  833 
  834                         while (*p)
  835                                 PCHAR(*p--);
  836 
  837                         if (ladjust)
  838                                 while (width-- > 0)
  839                                         PCHAR(' ');
  840 
  841                         break;
  842                 default:
  843                         while (percent < fmt)
  844                                 PCHAR(*percent++);
  845                         /*
  846                          * Since we ignore an formatting argument it is no 
  847                          * longer safe to obey the remaining formatting
  848                          * arguments as the arguments will no longer match
  849                          * the format specs.
  850                          */
  851                         stop = 1;
  852                         break;
  853                 }
  854         }
  855 #undef PCHAR
  856 }
  857 
  858 /*
  859  * Put character in log buffer with a particular priority.
  860  */
  861 static void
  862 msglogchar(int c, int pri)
  863 {
  864         static int lastpri = -1;
  865         static int dangling;
  866         char nbuf[MAXNBUF];
  867         char *p;
  868 
  869         if (!msgbufmapped)
  870                 return;
  871         if (c == '\0' || c == '\r')
  872                 return;
  873         if (pri != -1 && pri != lastpri) {
  874                 if (dangling) {
  875                         msgbuf_addchar(msgbufp, '\n');
  876                         dangling = 0;
  877                 }
  878                 msgbuf_addchar(msgbufp, '<');
  879                 for (p = ksprintn(nbuf, (uintmax_t)pri, 10, NULL, 0); *p;)
  880                         msgbuf_addchar(msgbufp, *p--);
  881                 msgbuf_addchar(msgbufp, '>');
  882                 lastpri = pri;
  883         }
  884         msgbuf_addchar(msgbufp, c);
  885         if (c == '\n') {
  886                 dangling = 0;
  887                 lastpri = -1;
  888         } else {
  889                 dangling = 1;
  890         }
  891 }
  892 
  893 void
  894 msgbufinit(void *ptr, int size)
  895 {
  896         char *cp;
  897         static struct msgbuf *oldp = NULL;
  898 
  899         size -= sizeof(*msgbufp);
  900         cp = (char *)ptr;
  901         msgbufp = (struct msgbuf *)(cp + size);
  902         msgbuf_reinit(msgbufp, cp, size);
  903         if (msgbufmapped && oldp != msgbufp)
  904                 msgbuf_copy(oldp, msgbufp);
  905         msgbufmapped = 1;
  906         oldp = msgbufp;
  907 }
  908 
  909 static int unprivileged_read_msgbuf = 1;
  910 SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_read_msgbuf,
  911     CTLFLAG_RW, &unprivileged_read_msgbuf, 0,
  912     "Unprivileged processes may read the kernel message buffer");
  913 
  914 /* Sysctls for accessing/clearing the msgbuf */
  915 static int
  916 sysctl_kern_msgbuf(SYSCTL_HANDLER_ARGS)
  917 {
  918         char buf[128];
  919         u_int seq;
  920         int error, len;
  921 
  922         if (!unprivileged_read_msgbuf) {
  923                 error = priv_check(req->td, PRIV_MSGBUF);
  924                 if (error)
  925                         return (error);
  926         }
  927 
  928         /* Read the whole buffer, one chunk at a time. */
  929         msgbuf_peekbytes(msgbufp, NULL, 0, &seq);
  930         while ((len = msgbuf_peekbytes(msgbufp, buf, sizeof(buf), &seq)) > 0) {
  931                 error = sysctl_handle_opaque(oidp, buf, len, req);
  932                 if (error)
  933                         return (error);
  934         }
  935         return (0);
  936 }
  937 
  938 SYSCTL_PROC(_kern, OID_AUTO, msgbuf, CTLTYPE_STRING | CTLFLAG_RD,
  939     NULL, 0, sysctl_kern_msgbuf, "A", "Contents of kernel message buffer");
  940 
  941 static int msgbuf_clearflag;
  942 
  943 static int
  944 sysctl_kern_msgbuf_clear(SYSCTL_HANDLER_ARGS)
  945 {
  946         int error;
  947         error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req);
  948         if (!error && req->newptr) {
  949                 msgbuf_clear(msgbufp);
  950                 msgbuf_clearflag = 0;
  951         }
  952         return (error);
  953 }
  954 
  955 SYSCTL_PROC(_kern, OID_AUTO, msgbuf_clear,
  956     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE, &msgbuf_clearflag, 0,
  957     sysctl_kern_msgbuf_clear, "I", "Clear kernel message buffer");
  958 
  959 #ifdef DDB
  960 
  961 DB_SHOW_COMMAND(msgbuf, db_show_msgbuf)
  962 {
  963         int i, j;
  964 
  965         if (!msgbufmapped) {
  966                 db_printf("msgbuf not mapped yet\n");
  967                 return;
  968         }
  969         db_printf("msgbufp = %p\n", msgbufp);
  970         db_printf("magic = %x, size = %d, r= %u, w = %u, ptr = %p, cksum= %u\n",
  971             msgbufp->msg_magic, msgbufp->msg_size, msgbufp->msg_rseq,
  972             msgbufp->msg_wseq, msgbufp->msg_ptr, msgbufp->msg_cksum);
  973         for (i = 0; i < msgbufp->msg_size && !db_pager_quit; i++) {
  974                 j = MSGBUF_SEQ_TO_POS(msgbufp, i + msgbufp->msg_rseq);
  975                 db_printf("%c", msgbufp->msg_ptr[j]);
  976         }
  977         db_printf("\n");
  978 }
  979 
  980 #endif /* DDB */
  981 
  982 void
  983 hexdump(const void *ptr, int length, const char *hdr, int flags)
  984 {
  985         int i, j, k;
  986         int cols;
  987         const unsigned char *cp;
  988         char delim;
  989 
  990         if ((flags & HD_DELIM_MASK) != 0)
  991                 delim = (flags & HD_DELIM_MASK) >> 8;
  992         else
  993                 delim = ' ';
  994 
  995         if ((flags & HD_COLUMN_MASK) != 0)
  996                 cols = flags & HD_COLUMN_MASK;
  997         else
  998                 cols = 16;
  999 
 1000         cp = ptr;
 1001         for (i = 0; i < length; i+= cols) {
 1002                 if (hdr != NULL)
 1003                         printf("%s", hdr);
 1004 
 1005                 if ((flags & HD_OMIT_COUNT) == 0)
 1006                         printf("%04x  ", i);
 1007 
 1008                 if ((flags & HD_OMIT_HEX) == 0) {
 1009                         for (j = 0; j < cols; j++) {
 1010                                 k = i + j;
 1011                                 if (k < length)
 1012                                         printf("%c%02x", delim, cp[k]);
 1013                                 else
 1014                                         printf("   ");
 1015                         }
 1016                 }
 1017 
 1018                 if ((flags & HD_OMIT_CHARS) == 0) {
 1019                         printf("  |");
 1020                         for (j = 0; j < cols; j++) {
 1021                                 k = i + j;
 1022                                 if (k >= length)
 1023                                         printf(" ");
 1024                                 else if (cp[k] >= ' ' && cp[k] <= '~')
 1025                                         printf("%c", cp[k]);
 1026                                 else
 1027                                         printf(".");
 1028                         }
 1029                         printf("|");
 1030                 }
 1031                 printf("\n");
 1032         }
 1033 }
 1034 

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