sys/kern/subr_prf.c

   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("$FreeBSD$");
  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         struct thread *td = curthread;
 131         struct proc *p = td->td_proc;
 132         va_list ap;
 133         struct putchar_arg pca;
 134         int retval;
 135
 136         if (td == NULL || TD_IS_IDLETHREAD(td))
 137                 return (0);
 138
 139         sx_slock(&proctree_lock);
 140         p = td->td_proc;
 141         PROC_LOCK(p);
 142         if ((p->p_flag & P_CONTROLT) == 0) {
 143                 PROC_UNLOCK(p);
 144                 retval = 0;
 145                 goto out;
 146         }
 147         SESS_LOCK(p->p_session);
 148         pca.tty = p->p_session->s_ttyp;
 149         SESS_UNLOCK(p->p_session);
 150         PROC_UNLOCK(p);
 151         if (pca.tty == NULL) {
 152                 retval = 0;
 153                 goto out;
 154         }
 155         pca.flags = TOTTY;
 156         va_start(ap, fmt);
 157         tty_lock(pca.tty);
 158         retval = kvprintf(fmt, putchar, &pca, 10, ap);
 159         tty_unlock(pca.tty);
 160         va_end(ap);
 161 out:
 162         sx_sunlock(&proctree_lock);
 163         return (retval);
 164 }
 165
 166 /*
 167  * tprintf prints on the controlling terminal associated with the given
 168  * session, possibly to the log as well.
 169  */
 170 void
 171 tprintf(struct proc *p, int pri, const char *fmt, ...)
 172 {
 173         struct tty *tp = NULL;
 174         int flags = 0;
 175         va_list ap;
 176         struct putchar_arg pca;
 177         struct session *sess = NULL;
 178
 179         sx_slock(&proctree_lock);
 180         if (pri != -1)
 181                 flags |= TOLOG;
 182         if (p != NULL) {
 183                 PROC_LOCK(p);
 184                 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) {
 185                         sess = p->p_session;
 186                         sess_hold(sess);
 187                         PROC_UNLOCK(p);
 188                         tp = sess->s_ttyp;
 189                         if (tp != NULL && tty_checkoutq(tp))
 190                                 flags |= TOTTY;
 191                         else
 192                                 tp = NULL;
 193                 } else
 194                         PROC_UNLOCK(p);
 195         }
 196         pca.pri = pri;
 197         pca.tty = tp;
 198         pca.flags = flags;
 199         va_start(ap, fmt);
 200         if (pca.tty != NULL)
 201                 tty_lock(pca.tty);
 202         kvprintf(fmt, putchar, &pca, 10, ap);
 203         if (pca.tty != NULL)
 204                 tty_unlock(pca.tty);
 205         va_end(ap);
 206         if (sess != NULL)
 207                 sess_release(sess);
 208         msgbuftrigger = 1;
 209         sx_sunlock(&proctree_lock);
 210 }
 211
 212 /*
 213  * Ttyprintf displays a message on a tty; it should be used only by
 214  * the tty driver, or anything that knows the underlying tty will not
 215  * be revoke(2)'d away.  Other callers should use tprintf.
 216  */
 217 int
 218 ttyprintf(struct tty *tp, const char *fmt, ...)
 219 {
 220         va_list ap;
 221         struct putchar_arg pca;
 222         int retval;
 223
 224         va_start(ap, fmt);
 225         pca.tty = tp;
 226         pca.flags = TOTTY;
 227         retval = kvprintf(fmt, putchar, &pca, 10, ap);
 228         va_end(ap);
 229         return (retval);
 230 }
 231
 232 /*
 233  * Log writes to the log buffer, and guarantees not to sleep (so can be
 234  * called by interrupt routines).  If there is no process reading the
 235  * log yet, it writes to the console also.
 236  */
 237 void
 238 log(int level, const char *fmt, ...)
 239 {
 240         va_list ap;
 241         struct putchar_arg pca;
 242
 243         pca.tty = NULL;
 244         pca.pri = level;
 245         pca.flags = log_open ? TOLOG : TOCONS;
 246         pca.p_bufr = NULL;
 247
 248         va_start(ap, fmt);
 249         kvprintf(fmt, putchar, &pca, 10, ap);
 250         va_end(ap);
 251
 252         msgbuftrigger = 1;
 253 }
 254
 255 #define CONSCHUNK 128
 256
 257 void
 258 log_console(struct uio *uio)
 259 {
 260         int c, i, error, nl;
 261         char *consbuffer;
 262         int pri;
 263
 264         if (!log_console_output)
 265                 return;
 266
 267         pri = LOG_INFO | LOG_CONSOLE;
 268         uio = cloneuio(uio);
 269         consbuffer = malloc(CONSCHUNK, M_TEMP, M_WAITOK);
 270
 271         nl = 0;
 272         while (uio->uio_resid > 0) {
 273                 c = imin(uio->uio_resid, CONSCHUNK);
 274                 error = uiomove(consbuffer, c, uio);
 275                 if (error != 0)
 276                         break;
 277                 for (i = 0; i < c; i++) {
 278                         msglogchar(consbuffer[i], pri);
 279                         if (consbuffer[i] == '\n')
 280                                 nl = 1;
 281                         else
 282                                 nl = 0;
 283                 }
 284         }
 285         if (!nl)
 286                 msglogchar('\n', pri);
 287         msgbuftrigger = 1;
 288         free(uio, M_IOV);
 289         free(consbuffer, M_TEMP);
 290         return;
 291 }
 292
 293 int
 294 printf(const char *fmt, ...)
 295 {
 296         va_list ap;
 297         struct putchar_arg pca;
 298         int retval;
 299 #ifdef PRINTF_BUFR_SIZE
 300         char bufr[PRINTF_BUFR_SIZE];
 301 #endif
 302
 303         va_start(ap, fmt);
 304         pca.tty = NULL;
 305         pca.flags = TOCONS | TOLOG;
 306         pca.pri = -1;
 307 #ifdef PRINTF_BUFR_SIZE
 308         pca.p_bufr = bufr;
 309         pca.p_next = pca.p_bufr;
 310         pca.n_bufr = sizeof(bufr);
 311         pca.remain = sizeof(bufr);
 312         *pca.p_next = '\0';
 313 #else
 314         /* Don't buffer console output. */
 315         pca.p_bufr = NULL;
 316 #endif
 317
 318         retval = kvprintf(fmt, putchar, &pca, 10, ap);
 319         va_end(ap);
 320
 321 #ifdef PRINTF_BUFR_SIZE
 322         /* Write any buffered console output: */
 323         if (*pca.p_bufr != '\0')
 324                 cnputs(pca.p_bufr);
 325 #endif
 326
 327         if (!panicstr)
 328                 msgbuftrigger = 1;
 329
 330         return (retval);
 331 }
 332
 333 int
 334 vprintf(const char *fmt, va_list ap)
 335 {
 336         struct putchar_arg pca;
 337         int retval;
 338 #ifdef PRINTF_BUFR_SIZE
 339         char bufr[PRINTF_BUFR_SIZE];
 340 #endif
 341
 342         pca.tty = NULL;
 343         pca.flags = TOCONS | TOLOG;
 344         pca.pri = -1;
 345 #ifdef PRINTF_BUFR_SIZE
 346         pca.p_bufr = bufr;
 347         pca.p_next = pca.p_bufr;
 348         pca.n_bufr = sizeof(bufr);
 349         pca.remain = sizeof(bufr);
 350         *pca.p_next = '\0';
 351 #else
 352         /* Don't buffer console output. */
 353         pca.p_bufr = NULL;
 354 #endif
 355
 356         retval = kvprintf(fmt, putchar, &pca, 10, ap);
 357
 358 #ifdef PRINTF_BUFR_SIZE
 359         /* Write any buffered console output: */
 360         if (*pca.p_bufr != '\0')
 361                 cnputs(pca.p_bufr);
 362 #endif
 363
 364         if (!panicstr)
 365                 msgbuftrigger = 1;
 366
 367         return (retval);
 368 }
 369
 370 static void
 371 putcons(int c, struct putchar_arg *ap)
 372 {
 373         /* Check if no console output buffer was provided. */
 374         if (ap->p_bufr == NULL)
 375                 /* Output direct to the console. */
 376                 cnputc(c);
 377         else {
 378                 /* Buffer the character: */
 379                 if (c == '\n') {
 380                         *ap->p_next++ = '\r';
 381                         ap->remain--;
 382                 }
 383                 *ap->p_next++ = c;
 384                 ap->remain--;
 385
 386                 /* Always leave the buffer zero terminated. */
 387                 *ap->p_next = '\0';
 388
 389                 /* Check if the buffer needs to be flushed. */
 390                 if (ap->remain < 3 || c == '\n') {
 391                         cnputs(ap->p_bufr);
 392                         ap->p_next = ap->p_bufr;
 393                         ap->remain = ap->n_bufr;
 394                         *ap->p_next = '\0';
 395                 }
 396         }
 397 }
 398
 399 /*
 400  * Print a character on console or users terminal.  If destination is
 401  * the console then the last bunch of characters are saved in msgbuf for
 402  * inspection later.
 403  */
 404 static void
 405 putchar(int c, void *arg)
 406 {
 407         struct putchar_arg *ap = (struct putchar_arg*) arg;
 408         struct tty *tp = ap->tty;
 409         int flags = ap->flags;
 410
 411         /* Don't use the tty code after a panic or while in ddb. */
 412         if (kdb_active) {
 413                 if (c != '\0')
 414                         cnputc(c);
 415         } else if (panicstr || ((flags & TOCONS) && constty == NULL)) {
 416                 if (c != '\0')
 417                         putcons(c, ap);
 418         } else {
 419                 if ((flags & TOTTY) && tp != NULL)
 420                         tty_putchar(tp, c);
 421                 if (flags & TOCONS) {
 422                         if (constty != NULL)
 423                                 msgbuf_addchar(&consmsgbuf, c);
 424                         if (always_console_output && c != '\0')
 425                                 putcons(c, ap);
 426                 }
 427         }
 428         if ((flags & TOLOG))
 429                 msglogchar(c, ap->pri);
 430 }
 431
 432 /*
 433  * Scaled down version of sprintf(3).
 434  */
 435 int
 436 sprintf(char *buf, const char *cfmt, ...)
 437 {
 438         int retval;
 439         va_list ap;
 440
 441         va_start(ap, cfmt);
 442         retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
 443         buf[retval] = '\0';
 444         va_end(ap);
 445         return (retval);
 446 }
 447
 448 /*
 449  * Scaled down version of vsprintf(3).
 450  */
 451 int
 452 vsprintf(char *buf, const char *cfmt, va_list ap)
 453 {
 454         int retval;
 455
 456         retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
 457         buf[retval] = '\0';
 458         return (retval);
 459 }
 460
 461 /*
 462  * Scaled down version of snprintf(3).
 463  */
 464 int
 465 snprintf(char *str, size_t size, const char *format, ...)
 466 {
 467         int retval;
 468         va_list ap;
 469
 470         va_start(ap, format);
 471         retval = vsnprintf(str, size, format, ap);
 472         va_end(ap);
 473         return(retval);
 474 }
 475
 476 /*
 477  * Scaled down version of vsnprintf(3).
 478  */
 479 int
 480 vsnprintf(char *str, size_t size, const char *format, va_list ap)
 481 {
 482         struct snprintf_arg info;
 483         int retval;
 484
 485         info.str = str;
 486         info.remain = size;
 487         retval = kvprintf(format, snprintf_func, &info, 10, ap);
 488         if (info.remain >= 1)
 489                 *info.str++ = '\0';
 490         return (retval);
 491 }
 492
 493 /*
 494  * Kernel version which takes radix argument vsnprintf(3).
 495  */
 496 int
 497 vsnrprintf(char *str, size_t size, int radix, const char *format, va_list ap)
 498 {
 499         struct snprintf_arg info;
 500         int retval;
 501
 502         info.str = str;
 503         info.remain = size;
 504         retval = kvprintf(format, snprintf_func, &info, radix, ap);
 505         if (info.remain >= 1)
 506                 *info.str++ = '\0';
 507         return (retval);
 508 }
 509
 510 static void
 511 snprintf_func(int ch, void *arg)
 512 {
 513         struct snprintf_arg *const info = arg;
 514
 515         if (info->remain >= 2) {
 516                 *info->str++ = ch;
 517                 info->remain--;
 518         }
 519 }
 520
 521 /*
 522  * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse
 523  * order; return an optional length and a pointer to the last character
 524  * written in the buffer (i.e., the first character of the string).
 525  * The buffer pointed to by `nbuf' must have length >= MAXNBUF.
 526  */
 527 static char *
 528 ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper)
 529 {
 530         char *p, c;
 531
 532         p = nbuf;
 533         *p = '\0';
 534         do {
 535                 c = hex2ascii(num % base);
 536                 *++p = upper ? toupper(c) : c;
 537         } while (num /= base);
 538         if (lenp)
 539                 *lenp = p - nbuf;
 540         return (p);
 541 }
 542
 543 /*
 544  * Scaled down version of printf(3).
 545  *
 546  * Two additional formats:
 547  *
 548  * The format %b is supported to decode error registers.
 549  * Its usage is:
 550  *
 551  *      printf("reg=%b\n", regval, "<base><arg>*");
 552  *
 553  * where <base> is the output base expressed as a control character, e.g.
 554  * \10 gives octal; \20 gives hex.  Each arg is a sequence of characters,
 555  * the first of which gives the bit number to be inspected (origin 1), and
 556  * the next characters (up to a control character, i.e. a character <= 32),
 557  * give the name of the register.  Thus:
 558  *
 559  *      kvprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n");
 560  *
 561  * would produce output:
 562  *
 563  *      reg=3<BITTWO,BITONE>
 564  *
 565  * XXX:  %D  -- Hexdump, takes pointer and separator string:
 566  *              ("%6D", ptr, ":")   -> XX:XX:XX:XX:XX:XX
 567  *              ("%*D", len, ptr, " " -> XX XX XX XX ...
 568  */
 569 int
 570 kvprintf(char const *fmt, void (*func)(int, void*), void *arg, int radix, va_list ap)
 571 {
 572 #define PCHAR(c) {int cc=(c); if (func) (*func)(cc,arg); else *d++ = cc; retval++; }
 573         char nbuf[MAXNBUF];
 574         char *d;
 575         const char *p, *percent, *q;
 576         u_char *up;
 577         int ch, n;
 578         uintmax_t num;
 579         int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot;
 580         int cflag, hflag, jflag, tflag, zflag;
 581         int dwidth, upper;
 582         char padc;
 583         int stop = 0, retval = 0;
 584
 585         num = 0;
 586         if (!func)
 587                 d = (char *) arg;
 588         else
 589                 d = NULL;
 590
 591         if (fmt == NULL)
 592                 fmt = "(fmt null)\n";
 593
 594         if (radix < 2 || radix > 36)
 595                 radix = 10;
 596
 597         for (;;) {
 598                 padc = ' ';
 599                 width = 0;
 600                 while ((ch = (u_char)*fmt++) != '%' || stop) {
 601                         if (ch == '\0')
 602                                 return (retval);
 603                         PCHAR(ch);
 604                 }
 605                 percent = fmt - 1;
 606                 qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0;
 607                 sign = 0; dot = 0; dwidth = 0; upper = 0;
 608                 cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 0;
 609 reswitch:       switch (ch = (u_char)*fmt++) {
 610                 case '.':
 611                         dot = 1;
 612                         goto reswitch;
 613                 case '#':
 614                         sharpflag = 1;
 615                         goto reswitch;
 616                 case '+':
 617                         sign = 1;
 618                         goto reswitch;
 619                 case '-':
 620                         ladjust = 1;
 621                         goto reswitch;
 622                 case '%':
 623                         PCHAR(ch);
 624                         break;
 625                 case '*':
 626                         if (!dot) {
 627                                 width = va_arg(ap, int);
 628                                 if (width < 0) {
 629                                         ladjust = !ladjust;
 630                                         width = -width;
 631                                 }
 632                         } else {
 633                                 dwidth = va_arg(ap, int);
 634                         }
 635                         goto reswitch;
 636                 case '0':
 637                         if (!dot) {
 638                                 padc = '0';
 639                                 goto reswitch;
 640                         }
 641                 case '1': case '2': case '3': case '4':
 642                 case '5': case '6': case '7': case '8': case '9':
 643                                 for (n = 0;; ++fmt) {
 644                                         n = n * 10 + ch - '0';
 645                                         ch = *fmt;
 646                                         if (ch < '0' || ch > '9')
 647                                                 break;
 648                                 }
 649                         if (dot)
 650                                 dwidth = n;
 651                         else
 652                                 width = n;
 653                         goto reswitch;
 654                 case 'b':
 655                         num = (u_int)va_arg(ap, int);
 656                         p = va_arg(ap, char *);
 657                         for (q = ksprintn(nbuf, num, *p++, NULL, 0); *q;)
 658                                 PCHAR(*q--);
 659
 660                         if (num == 0)
 661                                 break;
 662
 663                         for (tmp = 0; *p;) {
 664                                 n = *p++;
 665                                 if (num & (1 << (n - 1))) {
 666                                         PCHAR(tmp ? ',' : '<');
 667                                         for (; (n = *p) > ' '; ++p)
 668                                                 PCHAR(n);
 669                                         tmp = 1;
 670                                 } else
 671                                         for (; *p > ' '; ++p)
 672                                                 continue;
 673                         }
 674                         if (tmp)
 675                                 PCHAR('>');
 676                         break;
 677                 case 'c':
 678                         PCHAR(va_arg(ap, int));
 679                         break;
 680                 case 'D':
 681                         up = va_arg(ap, u_char *);
 682                         p = va_arg(ap, char *);
 683                         if (!width)
 684                                 width = 16;
 685                         while(width--) {
 686                                 PCHAR(hex2ascii(*up >> 4));
 687                                 PCHAR(hex2ascii(*up & 0x0f));
 688                                 up++;
 689                                 if (width)
 690                                         for (q=p;*q;q++)
 691                                                 PCHAR(*q);
 692                         }
 693                         break;
 694                 case 'd':
 695                 case 'i':
 696                         base = 10;
 697                         sign = 1;
 698                         goto handle_sign;
 699                 case 'h':
 700                         if (hflag) {
 701                                 hflag = 0;
 702                                 cflag = 1;
 703                         } else
 704                                 hflag = 1;
 705                         goto reswitch;
 706                 case 'j':
 707                         jflag = 1;
 708                         goto reswitch;
 709                 case 'l':
 710                         if (lflag) {
 711                                 lflag = 0;
 712                                 qflag = 1;
 713                         } else
 714                                 lflag = 1;
 715                         goto reswitch;
 716                 case 'n':
 717                         if (jflag)
 718                                 *(va_arg(ap, intmax_t *)) = retval;
 719                         else if (qflag)
 720                                 *(va_arg(ap, quad_t *)) = retval;
 721                         else if (lflag)
 722                                 *(va_arg(ap, long *)) = retval;
 723                         else if (zflag)
 724                                 *(va_arg(ap, size_t *)) = retval;
 725                         else if (hflag)
 726                                 *(va_arg(ap, short *)) = retval;
 727                         else if (cflag)
 728                                 *(va_arg(ap, char *)) = retval;
 729                         else
 730                                 *(va_arg(ap, int *)) = retval;
 731                         break;
 732                 case 'o':
 733                         base = 8;
 734                         goto handle_nosign;
 735                 case 'p':
 736                         base = 16;
 737                         sharpflag = (width == 0);
 738                         sign = 0;
 739                         num = (uintptr_t)va_arg(ap, void *);
 740                         goto number;
 741                 case 'q':
 742                         qflag = 1;
 743                         goto reswitch;
 744                 case 'r':
 745                         base = radix;
 746                         if (sign)
 747                                 goto handle_sign;
 748                         goto handle_nosign;
 749                 case 's':
 750                         p = va_arg(ap, char *);
 751                         if (p == NULL)
 752                                 p = "(null)";
 753                         if (!dot)
 754                                 n = strlen (p);
 755                         else
 756                                 for (n = 0; n < dwidth && p[n]; n++)
 757                                         continue;
 758
 759                         width -= n;
 760
 761                         if (!ladjust && width > 0)
 762                                 while (width--)
 763                                         PCHAR(padc);
 764                         while (n--)
 765                                 PCHAR(*p++);
 766                         if (ladjust && width > 0)
 767                                 while (width--)
 768                                         PCHAR(padc);
 769                         break;
 770                 case 't':
 771                         tflag = 1;
 772                         goto reswitch;
 773                 case 'u':
 774                         base = 10;
 775                         goto handle_nosign;
 776                 case 'X':
 777                         upper = 1;
 778                 case 'x':
 779                         base = 16;
 780                         goto handle_nosign;
 781                 case 'y':
 782                         base = 16;
 783                         sign = 1;
 784                         goto handle_sign;
 785                 case 'z':
 786                         zflag = 1;
 787                         goto reswitch;
 788 handle_nosign:
 789                         sign = 0;
 790                         if (jflag)
 791                                 num = va_arg(ap, uintmax_t);
 792                         else if (qflag)
 793                                 num = va_arg(ap, u_quad_t);
 794                         else if (tflag)
 795                                 num = va_arg(ap, ptrdiff_t);
 796                         else if (lflag)
 797                                 num = va_arg(ap, u_long);
 798                         else if (zflag)
 799                                 num = va_arg(ap, size_t);
 800                         else if (hflag)
 801                                 num = (u_short)va_arg(ap, int);
 802                         else if (cflag)
 803                                 num = (u_char)va_arg(ap, int);
 804                         else
 805                                 num = va_arg(ap, u_int);
 806                         goto number;
 807 handle_sign:
 808                         if (jflag)
 809                                 num = va_arg(ap, intmax_t);
 810                         else if (qflag)
 811                                 num = va_arg(ap, quad_t);
 812                         else if (tflag)
 813                                 num = va_arg(ap, ptrdiff_t);
 814                         else if (lflag)
 815                                 num = va_arg(ap, long);
 816                         else if (zflag)
 817                                 num = va_arg(ap, size_t);
 818                         else if (hflag)
 819                                 num = (short)va_arg(ap, int);
 820                         else if (cflag)
 821                                 num = (char)va_arg(ap, int);
 822                         else
 823                                 num = va_arg(ap, int);
 824 number:
 825                         if (sign && (intmax_t)num < 0) {
 826                                 neg = 1;
 827                                 num = -(intmax_t)num;
 828                         }
 829                         p = ksprintn(nbuf, num, base, &tmp, upper);
 830                         if (sharpflag && num != 0) {
 831                                 if (base == 8)
 832                                         tmp++;
 833                                 else if (base == 16)
 834                                         tmp += 2;
 835                         }
 836                         if (neg)
 837                                 tmp++;
 838
 839                         if (!ladjust && padc != '0' && width
 840                             && (width -= tmp) > 0)
 841                                 while (width--)
 842                                         PCHAR(padc);
 843                         if (neg)
 844                                 PCHAR('-');
 845                         if (sharpflag && num != 0) {
 846                                 if (base == 8) {
 847                                         PCHAR('0');
 848                                 } else if (base == 16) {
 849                                         PCHAR('0');
 850                                         PCHAR('x');
 851                                 }
 852                         }
 853                         if (!ladjust && width && (width -= tmp) > 0)
 854                                 while (width--)
 855                                         PCHAR(padc);
 856
 857                         while (*p)
 858                                 PCHAR(*p--);
 859
 860                         if (ladjust && width && (width -= tmp) > 0)
 861                                 while (width--)
 862                                         PCHAR(padc);
 863
 864                         break;
 865                 default:
 866                         while (percent < fmt)
 867                                 PCHAR(*percent++);
 868                         /*
 869                          * Since we ignore an formatting argument it is no
 870                          * longer safe to obey the remaining formatting
 871                          * arguments as the arguments will no longer match
 872                          * the format specs.
 873                          */
 874                         stop = 1;
 875                         break;
 876                 }
 877         }
 878 #undef PCHAR
 879 }
 880
 881 /*
 882  * Put character in log buffer with a particular priority.
 883  */
 884 static void
 885 msglogchar(int c, int pri)
 886 {
 887         static int lastpri = -1;
 888         static int dangling;
 889         char nbuf[MAXNBUF];
 890         char *p;
 891
 892         if (!msgbufmapped)
 893                 return;
 894         if (c == '\0' || c == '\r')
 895                 return;
 896         if (pri != -1 && pri != lastpri) {
 897                 if (dangling) {
 898                         msgbuf_addchar(msgbufp, '\n');
 899                         dangling = 0;
 900                 }
 901                 msgbuf_addchar(msgbufp, '<');
 902                 for (p = ksprintn(nbuf, (uintmax_t)pri, 10, NULL, 0); *p;)
 903                         msgbuf_addchar(msgbufp, *p--);
 904                 msgbuf_addchar(msgbufp, '>');
 905                 lastpri = pri;
 906         }
 907         msgbuf_addchar(msgbufp, c);
 908         if (c == '\n') {
 909                 dangling = 0;
 910                 lastpri = -1;
 911         } else {
 912                 dangling = 1;
 913         }
 914 }
 915
 916 void
 917 msgbufinit(void *ptr, int size)
 918 {
 919         char *cp;
 920         static struct msgbuf *oldp = NULL;
 921
 922         size -= sizeof(*msgbufp);
 923         cp = (char *)ptr;
 924         msgbufp = (struct msgbuf *)(cp + size);
 925         msgbuf_reinit(msgbufp, cp, size);
 926         if (msgbufmapped && oldp != msgbufp)
 927                 msgbuf_copy(oldp, msgbufp);
 928         msgbufmapped = 1;
 929         oldp = msgbufp;
 930 }
 931
 932 static int unprivileged_read_msgbuf = 1;
 933 SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_read_msgbuf,
 934     CTLFLAG_RW, &unprivileged_read_msgbuf, 0,
 935     "Unprivileged processes may read the kernel message buffer");
 936
 937 /* Sysctls for accessing/clearing the msgbuf */
 938 static int
 939 sysctl_kern_msgbuf(SYSCTL_HANDLER_ARGS)
 940 {
 941         char buf[128];
 942         u_int seq;
 943         int error, len;
 944
 945         if (!unprivileged_read_msgbuf) {
 946                 error = priv_check(req->td, PRIV_MSGBUF);
 947                 if (error)
 948                         return (error);
 949         }
 950
 951         /* Read the whole buffer, one chunk at a time. */
 952         msgbuf_peekbytes(msgbufp, NULL, 0, &seq);
 953         while ((len = msgbuf_peekbytes(msgbufp, buf, sizeof(buf), &seq)) > 0) {
 954                 error = sysctl_handle_opaque(oidp, buf, len, req);
 955                 if (error)
 956                         return (error);
 957         }
 958         return (0);
 959 }
 960
 961 SYSCTL_PROC(_kern, OID_AUTO, msgbuf, CTLTYPE_STRING | CTLFLAG_RD,
 962     0, 0, sysctl_kern_msgbuf, "A", "Contents of kernel message buffer");
 963
 964 static int msgbuf_clearflag;
 965
 966 static int
 967 sysctl_kern_msgbuf_clear(SYSCTL_HANDLER_ARGS)
 968 {
 969         int error;
 970         error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req);
 971         if (!error && req->newptr) {
 972                 msgbuf_clear(msgbufp);
 973                 msgbuf_clearflag = 0;
 974         }
 975         return (error);
 976 }
 977
 978 SYSCTL_PROC(_kern, OID_AUTO, msgbuf_clear,
 979     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE, &msgbuf_clearflag, 0,
 980     sysctl_kern_msgbuf_clear, "I", "Clear kernel message buffer");
 981
 982 #ifdef DDB
 983
 984 DB_SHOW_COMMAND(msgbuf, db_show_msgbuf)
 985 {
 986         int i, j;
 987
 988         if (!msgbufmapped) {
 989                 db_printf("msgbuf not mapped yet\n");
 990                 return;
 991         }
 992         db_printf("msgbufp = %p\n", msgbufp);
 993         db_printf("magic = %x, size = %d, r= %u, w = %u, ptr = %p, cksum= %u\n",
 994             msgbufp->msg_magic, msgbufp->msg_size, msgbufp->msg_rseq,
 995             msgbufp->msg_wseq, msgbufp->msg_ptr, msgbufp->msg_cksum);
 996         for (i = 0; i < msgbufp->msg_size && !db_pager_quit; i++) {
 997                 j = MSGBUF_SEQ_TO_POS(msgbufp, i + msgbufp->msg_rseq);
 998                 db_printf("%c", msgbufp->msg_ptr[j]);
 999         }
1000         db_printf("\n");
1001 }
1002
1003 #endif /* DDB */
1004
1005 void
1006 hexdump(const void *ptr, int length, const char *hdr, int flags)
1007 {
1008         int i, j, k;
1009         int cols;
1010         const unsigned char *cp;
1011         char delim;
1012
1013         if ((flags & HD_DELIM_MASK) != 0)
1014                 delim = (flags & HD_DELIM_MASK) >> 8;
1015         else
1016                 delim = ' ';
1017
1018         if ((flags & HD_COLUMN_MASK) != 0)
1019                 cols = flags & HD_COLUMN_MASK;
1020         else
1021                 cols = 16;
1022
1023         cp = ptr;
1024         for (i = 0; i < length; i+= cols) {
1025                 if (hdr != NULL)
1026                         printf("%s", hdr);
1027
1028                 if ((flags & HD_OMIT_COUNT) == 0)
1029                         printf("%04x  ", i);
1030
1031                 if ((flags & HD_OMIT_HEX) == 0) {
1032                         for (j = 0; j < cols; j++) {
1033                                 k = i + j;
1034                                 if (k < length)
1035                                         printf("%c%02x", delim, cp[k]);
1036                                 else
1037                                         printf("   ");
1038                         }
1039                 }
1040
1041                 if ((flags & HD_OMIT_CHARS) == 0) {
1042                         printf("  |");
1043                         for (j = 0; j < cols; j++) {
1044                                 k = i + j;
1045                                 if (k >= length)
1046                                         printf(" ");
1047                                 else if (cp[k] >= ' ' && cp[k] <= '~')
1048                                         printf("%c", cp[k]);
1049                                 else
1050                                         printf(".");
1051                         }
1052                         printf("|");
1053                 }
1054                 printf("\n");
1055         }
1056 }
1057