hexdump.c revision 116664
156893Sfenner/*- 256893Sfenner * Copyright (c) 1986, 1988, 1991, 1993 356893Sfenner * The Regents of the University of California. All rights reserved. 4127668Sbms * (c) UNIX System Laboratories, Inc. 556893Sfenner * All or some portions of this file are derived from material licensed 656893Sfenner * to the University of California by American Telephone and Telegraph 756893Sfenner * Co. or Unix System Laboratories, Inc. and are reproduced herein with 856893Sfenner * the permission of UNIX System Laboratories, Inc. 956893Sfenner * 1056893Sfenner * Redistribution and use in source and binary forms, with or without 1156893Sfenner * modification, are permitted provided that the following conditions 1256893Sfenner * are met: 1356893Sfenner * 1. Redistributions of source code must retain the above copyright 1456893Sfenner * notice, this list of conditions and the following disclaimer. 1556893Sfenner * 2. Redistributions in binary form must reproduce the above copyright 16127668Sbms * notice, this list of conditions and the following disclaimer in the 1756893Sfenner * documentation and/or other materials provided with the distribution. 1856893Sfenner * 3. All advertising materials mentioning features or use of this software 1956893Sfenner * must display the following acknowledgement: 2056893Sfenner * This product includes software developed by the University of 2156893Sfenner * California, Berkeley and its contributors. 2256893Sfenner * 4. Neither the name of the University nor the names of its contributors 2356893Sfenner * may be used to endorse or promote products derived from this software 2456893Sfenner * without specific prior written permission. 2556893Sfenner * 2656893Sfenner * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2756893Sfenner * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2856893Sfenner * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2956893Sfenner * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 3056893Sfenner * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 3156893Sfenner * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 3256893Sfenner * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3356893Sfenner * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3456893Sfenner * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3556893Sfenner * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3656893Sfenner * SUCH DAMAGE. 3756893Sfenner * 3856893Sfenner * @(#)subr_prf.c 8.3 (Berkeley) 1/21/94 3956893Sfenner */ 4056893Sfenner 4156893Sfenner#include <sys/cdefs.h> 42127668Sbms__FBSDID("$FreeBSD: head/sys/kern/subr_prf.c 116664 2003-06-22 03:20:24Z iedowse $"); 4356893Sfenner 4456893Sfenner#include "opt_ddb.h" 45127668Sbms 46127668Sbms#include <sys/param.h> 4756893Sfenner#include <sys/systm.h> 4856893Sfenner#include <sys/lock.h> 4956893Sfenner#include <sys/mutex.h> 5056893Sfenner#include <sys/sx.h> 5156893Sfenner#include <sys/kernel.h> 5256893Sfenner#include <sys/msgbuf.h> 5356893Sfenner#include <sys/malloc.h> 5456893Sfenner#include <sys/proc.h> 5556893Sfenner#include <sys/stddef.h> 5656893Sfenner#include <sys/sysctl.h> 5756893Sfenner#include <sys/tty.h> 5856893Sfenner#include <sys/syslog.h> 5956893Sfenner#include <sys/cons.h> 6056893Sfenner#include <sys/uio.h> 6156893Sfenner 6256893Sfenner#ifdef DDB 6356893Sfenner#include <ddb/ddb.h> 6456893Sfenner#endif 6556893Sfenner 6656893Sfenner/* 6756893Sfenner * Note that stdarg.h and the ANSI style va_start macro is used for both 6856893Sfenner * ANSI and traditional C compilers. 6956893Sfenner */ 7056893Sfenner#include <machine/stdarg.h> 7156893Sfenner 7256893Sfenner#define TOCONS 0x01 7356893Sfenner#define TOTTY 0x02 7456893Sfenner#define TOLOG 0x04 7556893Sfenner 7656893Sfenner/* Max number conversion buffer length: a u_quad_t in base 2, plus NUL byte. */ 7756893Sfenner#define MAXNBUF (sizeof(intmax_t) * NBBY + 1) 7856893Sfenner 7956893Sfennerstruct putchar_arg { 8056893Sfenner int flags; 8156893Sfenner int pri; 8256893Sfenner struct tty *tty; 8356893Sfenner}; 8456893Sfenner 8556893Sfennerstruct snprintf_arg { 8656893Sfenner char *str; 8756893Sfenner size_t remain; 8856893Sfenner}; 8956893Sfenner 9056893Sfennerextern int log_open; 9156893Sfenner 9256893Sfennerstatic void msglogchar(int c, int pri); 9356893Sfennerstatic void putchar(int ch, void *arg); 9456893Sfennerstatic char *ksprintn(char *nbuf, uintmax_t num, int base, int *len); 9556893Sfennerstatic void snprintf_func(int ch, void *arg); 9656893Sfenner 9756893Sfennerstatic int consintr = 1; /* Ok to handle console interrupts? */ 9856893Sfennerstatic int msgbufmapped; /* Set when safe to use msgbuf */ 9956893Sfennerint msgbuftrigger; 10056893Sfenner 10156893Sfennerstatic int log_console_output = 1; 10256893SfennerTUNABLE_INT("kern.log_console_output", &log_console_output); 10356893SfennerSYSCTL_INT(_kern, OID_AUTO, log_console_output, CTLFLAG_RW, 10456893Sfenner &log_console_output, 0, ""); 10556893Sfenner 10656893Sfenner/* 10756893Sfenner * Warn that a system table is full. 10856893Sfenner */ 10956893Sfennervoid 11056893Sfennertablefull(const char *tab) 11156893Sfenner{ 11256893Sfenner 11356893Sfenner log(LOG_ERR, "%s: table is full\n", tab); 11456893Sfenner} 11556893Sfenner 11656893Sfenner/* 11756893Sfenner * Uprintf prints to the controlling terminal for the current process. 11856893Sfenner * It may block if the tty queue is overfull. No message is printed if 11956893Sfenner * the queue does not clear in a reasonable time. 12056893Sfenner */ 12156893Sfennerint 12256893Sfenneruprintf(const char *fmt, ...) 12356893Sfenner{ 12456893Sfenner struct thread *td = curthread; 12556893Sfenner struct proc *p = td->td_proc; 12656893Sfenner va_list ap; 127127668Sbms struct putchar_arg pca; 12856893Sfenner int retval; 12956893Sfenner 13056893Sfenner if (td == NULL || td == PCPU_GET(idlethread)) 13156893Sfenner return (0); 13256893Sfenner 13356893Sfenner p = td->td_proc; 13456893Sfenner PROC_LOCK(p); 135127668Sbms if ((p->p_flag & P_CONTROLT) == 0) { 13656893Sfenner PROC_UNLOCK(p); 13756893Sfenner return (0); 13856893Sfenner } 139127668Sbms SESS_LOCK(p->p_session); 14056893Sfenner pca.tty = p->p_session->s_ttyp; 14156893Sfenner SESS_UNLOCK(p->p_session); 14256893Sfenner PROC_UNLOCK(p); 14356893Sfenner if (pca.tty == NULL) 14456893Sfenner return (0); 14556893Sfenner pca.flags = TOTTY; 14656893Sfenner va_start(ap, fmt); 14756893Sfenner retval = kvprintf(fmt, putchar, &pca, 10, ap); 14856893Sfenner va_end(ap); 14956893Sfenner 15056893Sfenner return (retval); 15156893Sfenner} 15256893Sfenner 15356893Sfenner/* 15456893Sfenner * tprintf prints on the controlling terminal associated 15556893Sfenner * with the given session, possibly to the log as well. 15656893Sfenner */ 15756893Sfennervoid 15875115Sfennertprintf(struct proc *p, int pri, const char *fmt, ...) 15956893Sfenner{ 16056893Sfenner struct tty *tp = NULL; 16156893Sfenner int flags = 0; 16275115Sfenner va_list ap; 16375115Sfenner struct putchar_arg pca; 16456893Sfenner struct session *sess = NULL; 16556893Sfenner 16656893Sfenner if (pri != -1) 16756893Sfenner flags |= TOLOG; 16856893Sfenner if (p != NULL) { 16956893Sfenner PROC_LOCK(p); 17056893Sfenner if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) { 17156893Sfenner sess = p->p_session; 17256893Sfenner SESS_LOCK(sess); 17356893Sfenner PROC_UNLOCK(p); 17456893Sfenner SESSHOLD(sess); 17556893Sfenner tp = sess->s_ttyp; 17656893Sfenner SESS_UNLOCK(sess); 177127668Sbms if (ttycheckoutq(tp, 0)) 17856893Sfenner flags |= TOTTY; 17956893Sfenner else 18056893Sfenner tp = NULL; 18156893Sfenner } else 18256893Sfenner PROC_UNLOCK(p); 18356893Sfenner } 18456893Sfenner pca.pri = pri; 18556893Sfenner pca.tty = tp; 18656893Sfenner pca.flags = flags; 18756893Sfenner va_start(ap, fmt); 18856893Sfenner kvprintf(fmt, putchar, &pca, 10, ap); 18956893Sfenner va_end(ap); 19056893Sfenner if (sess != NULL) { 19156893Sfenner SESS_LOCK(sess); 19256893Sfenner SESSRELE(sess); 19356893Sfenner SESS_UNLOCK(sess); 19456893Sfenner } 19556893Sfenner msgbuftrigger = 1; 19656893Sfenner} 19756893Sfenner 19856893Sfenner/* 19956893Sfenner * Ttyprintf displays a message on a tty; it should be used only by 20056893Sfenner * the tty driver, or anything that knows the underlying tty will not 20156893Sfenner * be revoke(2)'d away. Other callers should use tprintf. 20256893Sfenner */ 20356893Sfennerint 20456893Sfennerttyprintf(struct tty *tp, const char *fmt, ...) 20556893Sfenner{ 20656893Sfenner va_list ap; 20756893Sfenner struct putchar_arg pca; 20856893Sfenner int retval; 20956893Sfenner 21056893Sfenner va_start(ap, fmt); 21156893Sfenner pca.tty = tp; 21256893Sfenner pca.flags = TOTTY; 21356893Sfenner retval = kvprintf(fmt, putchar, &pca, 10, ap); 21456893Sfenner va_end(ap); 21556893Sfenner return (retval); 21656893Sfenner} 21756893Sfenner 21856893Sfenner/* 21975115Sfenner * Log writes to the log buffer, and guarantees not to sleep (so can be 22056893Sfenner * called by interrupt routines). If there is no process reading the 22156893Sfenner * log yet, it writes to the console also. 22256893Sfenner */ 22356893Sfennervoid 22456893Sfennerlog(int level, const char *fmt, ...) 22556893Sfenner{ 22656893Sfenner va_list ap; 22756893Sfenner struct putchar_arg pca; 22856893Sfenner 22956893Sfenner pca.tty = NULL; 23056893Sfenner pca.pri = level; 23156893Sfenner pca.flags = log_open ? TOLOG : TOCONS; 23256893Sfenner 23356893Sfenner va_start(ap, fmt); 23456893Sfenner kvprintf(fmt, putchar, &pca, 10, ap); 23556893Sfenner va_end(ap); 23656893Sfenner 23756893Sfenner msgbuftrigger = 1; 23856893Sfenner} 23956893Sfenner 24056893Sfenner#define CONSCHUNK 128 24156893Sfenner 24256893Sfennervoid 24356893Sfennerlog_console(struct uio *uio) 24456893Sfenner{ 24556893Sfenner int c, i, error, iovlen, nl; 24656893Sfenner struct uio muio; 24756893Sfenner struct iovec *miov = NULL; 24856893Sfenner char *consbuffer; 24956893Sfenner int pri; 25056893Sfenner 25156893Sfenner if (!log_console_output) 25256893Sfenner return; 25356893Sfenner 25456893Sfenner pri = LOG_INFO | LOG_CONSOLE; 25556893Sfenner muio = *uio; 25656893Sfenner iovlen = uio->uio_iovcnt * sizeof (struct iovec); 25756893Sfenner MALLOC(miov, struct iovec *, iovlen, M_TEMP, M_WAITOK); 25856893Sfenner MALLOC(consbuffer, char *, CONSCHUNK, M_TEMP, M_WAITOK); 25975115Sfenner bcopy(muio.uio_iov, miov, iovlen); 26056893Sfenner muio.uio_iov = miov; 26156893Sfenner uio = &muio; 26256893Sfenner 26356893Sfenner nl = 0; 26456893Sfenner while (uio->uio_resid > 0) { 26556893Sfenner c = imin(uio->uio_resid, CONSCHUNK); 26656893Sfenner error = uiomove(consbuffer, c, uio); 26756893Sfenner if (error != 0) 26856893Sfenner break; 26956893Sfenner for (i = 0; i < c; i++) { 27056893Sfenner msglogchar(consbuffer[i], pri); 27156893Sfenner if (consbuffer[i] == '\n') 27256893Sfenner nl = 1; 27356893Sfenner else 27456893Sfenner nl = 0; 27575115Sfenner } 27656893Sfenner } 27756893Sfenner if (!nl) 27856893Sfenner msglogchar('\n', pri); 27956893Sfenner msgbuftrigger = 1; 28056893Sfenner FREE(miov, M_TEMP); 28156893Sfenner FREE(consbuffer, M_TEMP); 282 return; 283} 284 285int 286printf(const char *fmt, ...) 287{ 288 va_list ap; 289 int savintr; 290 struct putchar_arg pca; 291 int retval; 292 293 savintr = consintr; /* disable interrupts */ 294 consintr = 0; 295 va_start(ap, fmt); 296 pca.tty = NULL; 297 pca.flags = TOCONS | TOLOG; 298 pca.pri = -1; 299 retval = kvprintf(fmt, putchar, &pca, 10, ap); 300 va_end(ap); 301 if (!panicstr) 302 msgbuftrigger = 1; 303 consintr = savintr; /* reenable interrupts */ 304 return (retval); 305} 306 307int 308vprintf(const char *fmt, va_list ap) 309{ 310 int savintr; 311 struct putchar_arg pca; 312 int retval; 313 314 savintr = consintr; /* disable interrupts */ 315 consintr = 0; 316 pca.tty = NULL; 317 pca.flags = TOCONS | TOLOG; 318 pca.pri = -1; 319 retval = kvprintf(fmt, putchar, &pca, 10, ap); 320 if (!panicstr) 321 msgbuftrigger = 1; 322 consintr = savintr; /* reenable interrupts */ 323 return (retval); 324} 325 326/* 327 * Print a character on console or users terminal. If destination is 328 * the console then the last bunch of characters are saved in msgbuf for 329 * inspection later. 330 */ 331static void 332putchar(int c, void *arg) 333{ 334 struct putchar_arg *ap = (struct putchar_arg*) arg; 335 struct tty *tp = ap->tty; 336 int consdirect, flags = ap->flags; 337 338 consdirect = ((flags & TOCONS) && constty == NULL); 339 /* Don't use the tty code after a panic or while in ddb. */ 340 if (panicstr) 341 consdirect = 1; 342#ifdef DDB 343 if (db_active) 344 consdirect = 1; 345#endif 346 if (consdirect) { 347 if (c != '\0') 348 cnputc(c); 349 } else { 350 if ((flags & TOTTY) && tp != NULL) 351 tputchar(c, tp); 352 if ((flags & TOCONS) && constty != NULL) 353 msgbuf_addchar(&consmsgbuf, c); 354 } 355 if ((flags & TOLOG)) 356 msglogchar(c, ap->pri); 357} 358 359/* 360 * Scaled down version of sprintf(3). 361 */ 362int 363sprintf(char *buf, const char *cfmt, ...) 364{ 365 int retval; 366 va_list ap; 367 368 va_start(ap, cfmt); 369 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap); 370 buf[retval] = '\0'; 371 va_end(ap); 372 return (retval); 373} 374 375/* 376 * Scaled down version of vsprintf(3). 377 */ 378int 379vsprintf(char *buf, const char *cfmt, va_list ap) 380{ 381 int retval; 382 383 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap); 384 buf[retval] = '\0'; 385 return (retval); 386} 387 388/* 389 * Scaled down version of snprintf(3). 390 */ 391int 392snprintf(char *str, size_t size, const char *format, ...) 393{ 394 int retval; 395 va_list ap; 396 397 va_start(ap, format); 398 retval = vsnprintf(str, size, format, ap); 399 va_end(ap); 400 return(retval); 401} 402 403/* 404 * Scaled down version of vsnprintf(3). 405 */ 406int 407vsnprintf(char *str, size_t size, const char *format, va_list ap) 408{ 409 struct snprintf_arg info; 410 int retval; 411 412 info.str = str; 413 info.remain = size; 414 retval = kvprintf(format, snprintf_func, &info, 10, ap); 415 if (info.remain >= 1) 416 *info.str++ = '\0'; 417 return (retval); 418} 419 420/* 421 * Kernel version which takes radix argument vsnprintf(3). 422 */ 423int 424vsnrprintf(char *str, size_t size, int radix, const char *format, va_list ap) 425{ 426 struct snprintf_arg info; 427 int retval; 428 429 info.str = str; 430 info.remain = size; 431 retval = kvprintf(format, snprintf_func, &info, radix, ap); 432 if (info.remain >= 1) 433 *info.str++ = '\0'; 434 return (retval); 435} 436 437static void 438snprintf_func(int ch, void *arg) 439{ 440 struct snprintf_arg *const info = arg; 441 442 if (info->remain >= 2) { 443 *info->str++ = ch; 444 info->remain--; 445 } 446} 447 448/* 449 * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse 450 * order; return an optional length and a pointer to the last character 451 * written in the buffer (i.e., the first character of the string). 452 * The buffer pointed to by `nbuf' must have length >= MAXNBUF. 453 */ 454static char * 455ksprintn(char *nbuf, uintmax_t num, int base, int *lenp) 456{ 457 char *p; 458 459 p = nbuf; 460 *p = '\0'; 461 do { 462 *++p = hex2ascii(num % base); 463 } while (num /= base); 464 if (lenp) 465 *lenp = p - nbuf; 466 return (p); 467} 468 469/* 470 * Scaled down version of printf(3). 471 * 472 * Two additional formats: 473 * 474 * The format %b is supported to decode error registers. 475 * Its usage is: 476 * 477 * printf("reg=%b\n", regval, "<base><arg>*"); 478 * 479 * where <base> is the output base expressed as a control character, e.g. 480 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters, 481 * the first of which gives the bit number to be inspected (origin 1), and 482 * the next characters (up to a control character, i.e. a character <= 32), 483 * give the name of the register. Thus: 484 * 485 * kvprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n"); 486 * 487 * would produce output: 488 * 489 * reg=3<BITTWO,BITONE> 490 * 491 * XXX: %D -- Hexdump, takes pointer and separator string: 492 * ("%6D", ptr, ":") -> XX:XX:XX:XX:XX:XX 493 * ("%*D", len, ptr, " " -> XX XX XX XX ... 494 */ 495int 496kvprintf(char const *fmt, void (*func)(int, void*), void *arg, int radix, va_list ap) 497{ 498#define PCHAR(c) {int cc=(c); if (func) (*func)(cc,arg); else *d++ = cc; retval++; } 499 char nbuf[MAXNBUF]; 500 char *d; 501 const char *p, *percent, *q; 502 u_char *up; 503 int ch, n; 504 uintmax_t num; 505 int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot; 506 int jflag, tflag, zflag; 507 int dwidth; 508 char padc; 509 int retval = 0; 510 511 num = 0; 512 if (!func) 513 d = (char *) arg; 514 else 515 d = NULL; 516 517 if (fmt == NULL) 518 fmt = "(fmt null)\n"; 519 520 if (radix < 2 || radix > 36) 521 radix = 10; 522 523 for (;;) { 524 padc = ' '; 525 width = 0; 526 while ((ch = (u_char)*fmt++) != '%') { 527 if (ch == '\0') 528 return (retval); 529 PCHAR(ch); 530 } 531 percent = fmt - 1; 532 qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0; 533 sign = 0; dot = 0; dwidth = 0; 534 jflag = 0; tflag = 0; zflag = 0; 535reswitch: switch (ch = (u_char)*fmt++) { 536 case '.': 537 dot = 1; 538 goto reswitch; 539 case '#': 540 sharpflag = 1; 541 goto reswitch; 542 case '+': 543 sign = 1; 544 goto reswitch; 545 case '-': 546 ladjust = 1; 547 goto reswitch; 548 case '%': 549 PCHAR(ch); 550 break; 551 case '*': 552 if (!dot) { 553 width = va_arg(ap, int); 554 if (width < 0) { 555 ladjust = !ladjust; 556 width = -width; 557 } 558 } else { 559 dwidth = va_arg(ap, int); 560 } 561 goto reswitch; 562 case '0': 563 if (!dot) { 564 padc = '0'; 565 goto reswitch; 566 } 567 case '1': case '2': case '3': case '4': 568 case '5': case '6': case '7': case '8': case '9': 569 for (n = 0;; ++fmt) { 570 n = n * 10 + ch - '0'; 571 ch = *fmt; 572 if (ch < '0' || ch > '9') 573 break; 574 } 575 if (dot) 576 dwidth = n; 577 else 578 width = n; 579 goto reswitch; 580 case 'b': 581 num = (u_int)va_arg(ap, int); 582 p = va_arg(ap, char *); 583 for (q = ksprintn(nbuf, num, *p++, NULL); *q;) 584 PCHAR(*q--); 585 586 if (num == 0) 587 break; 588 589 for (tmp = 0; *p;) { 590 n = *p++; 591 if (num & (1 << (n - 1))) { 592 PCHAR(tmp ? ',' : '<'); 593 for (; (n = *p) > ' '; ++p) 594 PCHAR(n); 595 tmp = 1; 596 } else 597 for (; *p > ' '; ++p) 598 continue; 599 } 600 if (tmp) 601 PCHAR('>'); 602 break; 603 case 'c': 604 PCHAR(va_arg(ap, int)); 605 break; 606 case 'D': 607 up = va_arg(ap, u_char *); 608 p = va_arg(ap, char *); 609 if (!width) 610 width = 16; 611 while(width--) { 612 PCHAR(hex2ascii(*up >> 4)); 613 PCHAR(hex2ascii(*up & 0x0f)); 614 up++; 615 if (width) 616 for (q=p;*q;q++) 617 PCHAR(*q); 618 } 619 break; 620 case 'd': 621 case 'i': 622 base = 10; 623 sign = 1; 624 goto handle_sign; 625 case 'j': 626 jflag = 1; 627 goto reswitch; 628 case 'l': 629 if (lflag) { 630 lflag = 0; 631 qflag = 1; 632 } else 633 lflag = 1; 634 goto reswitch; 635 case 'n': 636 if (jflag) 637 *(va_arg(ap, intmax_t *)) = retval; 638 else if (qflag) 639 *(va_arg(ap, quad_t *)) = retval; 640 else if (lflag) 641 *(va_arg(ap, long *)) = retval; 642 else if (zflag) 643 *(va_arg(ap, size_t *)) = retval; 644 else 645 *(va_arg(ap, int *)) = retval; 646 break; 647 case 'o': 648 base = 8; 649 goto handle_nosign; 650 case 'p': 651 base = 16; 652 sharpflag = (width == 0); 653 sign = 0; 654 num = (uintptr_t)va_arg(ap, void *); 655 goto number; 656 case 'q': 657 qflag = 1; 658 goto reswitch; 659 case 'r': 660 base = radix; 661 if (sign) 662 goto handle_sign; 663 goto handle_nosign; 664 case 's': 665 p = va_arg(ap, char *); 666 if (p == NULL) 667 p = "(null)"; 668 if (!dot) 669 n = strlen (p); 670 else 671 for (n = 0; n < dwidth && p[n]; n++) 672 continue; 673 674 width -= n; 675 676 if (!ladjust && width > 0) 677 while (width--) 678 PCHAR(padc); 679 while (n--) 680 PCHAR(*p++); 681 if (ladjust && width > 0) 682 while (width--) 683 PCHAR(padc); 684 break; 685 case 't': 686 tflag = 1; 687 goto reswitch; 688 case 'u': 689 base = 10; 690 goto handle_nosign; 691 case 'x': 692 case 'X': 693 base = 16; 694 goto handle_nosign; 695 case 'y': 696 base = 16; 697 sign = 1; 698 goto handle_sign; 699 case 'z': 700 zflag = 1; 701 goto reswitch; 702handle_nosign: 703 sign = 0; 704 if (jflag) 705 num = va_arg(ap, uintmax_t); 706 else if (qflag) 707 num = va_arg(ap, u_quad_t); 708 else if (tflag) 709 num = va_arg(ap, ptrdiff_t); 710 else if (lflag) 711 num = va_arg(ap, u_long); 712 else if (zflag) 713 num = va_arg(ap, size_t); 714 else 715 num = va_arg(ap, u_int); 716 goto number; 717handle_sign: 718 if (jflag) 719 num = va_arg(ap, intmax_t); 720 else if (qflag) 721 num = va_arg(ap, quad_t); 722 else if (tflag) 723 num = va_arg(ap, ptrdiff_t); 724 else if (lflag) 725 num = va_arg(ap, long); 726 else if (zflag) 727 num = va_arg(ap, size_t); 728 else 729 num = va_arg(ap, int); 730number: 731 if (sign && (intmax_t)num < 0) { 732 neg = 1; 733 num = -(intmax_t)num; 734 } 735 p = ksprintn(nbuf, num, base, &tmp); 736 if (sharpflag && num != 0) { 737 if (base == 8) 738 tmp++; 739 else if (base == 16) 740 tmp += 2; 741 } 742 if (neg) 743 tmp++; 744 745 if (!ladjust && width && (width -= tmp) > 0) 746 while (width--) 747 PCHAR(padc); 748 if (neg) 749 PCHAR('-'); 750 if (sharpflag && num != 0) { 751 if (base == 8) { 752 PCHAR('0'); 753 } else if (base == 16) { 754 PCHAR('0'); 755 PCHAR('x'); 756 } 757 } 758 759 while (*p) 760 PCHAR(*p--); 761 762 if (ladjust && width && (width -= tmp) > 0) 763 while (width--) 764 PCHAR(padc); 765 766 break; 767 default: 768 while (percent < fmt) 769 PCHAR(*percent++); 770 break; 771 } 772 } 773#undef PCHAR 774} 775 776/* 777 * Put character in log buffer with a particular priority. 778 */ 779static void 780msglogchar(int c, int pri) 781{ 782 static int lastpri = -1; 783 static int dangling; 784 char nbuf[MAXNBUF]; 785 char *p; 786 787 if (!msgbufmapped) 788 return; 789 if (c == '\0' || c == '\r') 790 return; 791 if (pri != -1 && pri != lastpri) { 792 if (dangling) { 793 msgbuf_addchar(msgbufp, '\n'); 794 dangling = 0; 795 } 796 msgbuf_addchar(msgbufp, '<'); 797 for (p = ksprintn(nbuf, (uintmax_t)pri, 10, NULL); *p;) 798 msgbuf_addchar(msgbufp, *p--); 799 msgbuf_addchar(msgbufp, '>'); 800 lastpri = pri; 801 } 802 msgbuf_addchar(msgbufp, c); 803 if (c == '\n') { 804 dangling = 0; 805 lastpri = -1; 806 } else { 807 dangling = 1; 808 } 809} 810 811void 812msgbufinit(void *ptr, int size) 813{ 814 char *cp; 815 static struct msgbuf *oldp = NULL; 816 817 size -= sizeof(*msgbufp); 818 cp = (char *)ptr; 819 msgbufp = (struct msgbuf *)(cp + size); 820 msgbuf_reinit(msgbufp, cp, size); 821 if (msgbufmapped && oldp != msgbufp) 822 msgbuf_copy(oldp, msgbufp); 823 msgbufmapped = 1; 824 oldp = msgbufp; 825} 826 827SYSCTL_DECL(_security_bsd); 828 829static int unprivileged_read_msgbuf = 1; 830SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_read_msgbuf, 831 CTLFLAG_RW, &unprivileged_read_msgbuf, 0, 832 "Unprivileged processes may read the kernel message buffer"); 833 834/* Sysctls for accessing/clearing the msgbuf */ 835static int 836sysctl_kern_msgbuf(SYSCTL_HANDLER_ARGS) 837{ 838 char buf[128]; 839 u_int seq; 840 int error, len; 841 842 if (!unprivileged_read_msgbuf) { 843 error = suser(req->td); 844 if (error) 845 return (error); 846 } 847 848 /* Read the whole buffer, one chunk at a time. */ 849 msgbuf_peekbytes(msgbufp, NULL, 0, &seq); 850 while ((len = msgbuf_peekbytes(msgbufp, buf, sizeof(buf), &seq)) > 0) { 851 error = sysctl_handle_opaque(oidp, buf, len, req); 852 if (error) 853 return (error); 854 } 855 return (0); 856} 857 858SYSCTL_PROC(_kern, OID_AUTO, msgbuf, CTLTYPE_STRING | CTLFLAG_RD, 859 0, 0, sysctl_kern_msgbuf, "A", "Contents of kernel message buffer"); 860 861static int msgbuf_clearflag; 862 863static int 864sysctl_kern_msgbuf_clear(SYSCTL_HANDLER_ARGS) 865{ 866 int error; 867 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req); 868 if (!error && req->newptr) { 869 msgbuf_clear(msgbufp); 870 msgbuf_clearflag = 0; 871 } 872 return (error); 873} 874 875SYSCTL_PROC(_kern, OID_AUTO, msgbuf_clear, 876 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE, &msgbuf_clearflag, 0, 877 sysctl_kern_msgbuf_clear, "I", "Clear kernel message buffer"); 878 879#ifdef DDB 880 881DB_SHOW_COMMAND(msgbuf, db_show_msgbuf) 882{ 883 int i, j; 884 885 if (!msgbufmapped) { 886 db_printf("msgbuf not mapped yet\n"); 887 return; 888 } 889 db_printf("msgbufp = %p\n", msgbufp); 890 db_printf("magic = %x, size = %d, r= %u, w = %u, ptr = %p, cksum= %u\n", 891 msgbufp->msg_magic, msgbufp->msg_size, msgbufp->msg_rseq, 892 msgbufp->msg_wseq, msgbufp->msg_ptr, msgbufp->msg_cksum); 893 for (i = 0; i < msgbufp->msg_size; i++) { 894 j = MSGBUF_SEQ_TO_POS(msgbufp, i + msgbufp->msg_rseq); 895 db_printf("%c", msgbufp->msg_ptr[j]); 896 } 897 db_printf("\n"); 898} 899 900#endif /* DDB */ 901