hexdump.c revision 167327
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: head/sys/kern/subr_prf.c 167327 2007-03-08 06:44:34Z julian $"); 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 79struct 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 89struct snprintf_arg { 90 char *str; 91 size_t remain; 92}; 93 94extern int log_open; 95 96static void msglogchar(int c, int pri); 97static void putchar(int ch, void *arg); 98static char *ksprintn(char *nbuf, uintmax_t num, int base, int *len, int upper); 99static void snprintf_func(int ch, void *arg); 100 101static int msgbufmapped; /* Set when safe to use msgbuf */ 102int msgbuftrigger; 103 104static int log_console_output = 1; 105TUNABLE_INT("kern.log_console_output", &log_console_output); 106SYSCTL_INT(_kern, OID_AUTO, log_console_output, CTLFLAG_RW, 107 &log_console_output, 0, "Duplicate console output to the syslog."); 108 109static int always_console_output = 0; 110TUNABLE_INT("kern.always_console_output", &always_console_output); 111SYSCTL_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 */ 117void 118tablefull(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 */ 127int 128uprintf(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 mtx_lock(&Giant); 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 retval = kvprintf(fmt, putchar, &pca, 10, ap); 158 va_end(ap); 159out: 160 mtx_unlock(&Giant); 161 return (retval); 162} 163 164/* 165 * tprintf prints on the controlling terminal associated with the given 166 * session, possibly to the log as well. 167 */ 168void 169tprintf(struct proc *p, int pri, const char *fmt, ...) 170{ 171 struct tty *tp = NULL; 172 int flags = 0; 173 va_list ap; 174 struct putchar_arg pca; 175 struct session *sess = NULL; 176 177 mtx_lock(&Giant); 178 if (pri != -1) 179 flags |= TOLOG; 180 if (p != NULL) { 181 PROC_LOCK(p); 182 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) { 183 sess = p->p_session; 184 SESS_LOCK(sess); 185 PROC_UNLOCK(p); 186 SESSHOLD(sess); 187 tp = sess->s_ttyp; 188 SESS_UNLOCK(sess); 189 if (ttycheckoutq(tp, 0)) 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 kvprintf(fmt, putchar, &pca, 10, ap); 201 va_end(ap); 202 if (sess != NULL) 203 SESSRELE(sess); 204 msgbuftrigger = 1; 205 mtx_unlock(&Giant); 206} 207 208/* 209 * Ttyprintf displays a message on a tty; it should be used only by 210 * the tty driver, or anything that knows the underlying tty will not 211 * be revoke(2)'d away. Other callers should use tprintf. 212 */ 213int 214ttyprintf(struct tty *tp, const char *fmt, ...) 215{ 216 va_list ap; 217 struct putchar_arg pca; 218 int retval; 219 220 va_start(ap, fmt); 221 pca.tty = tp; 222 pca.flags = TOTTY; 223 retval = kvprintf(fmt, putchar, &pca, 10, ap); 224 va_end(ap); 225 return (retval); 226} 227 228/* 229 * Log writes to the log buffer, and guarantees not to sleep (so can be 230 * called by interrupt routines). If there is no process reading the 231 * log yet, it writes to the console also. 232 */ 233void 234log(int level, const char *fmt, ...) 235{ 236 va_list ap; 237 struct putchar_arg pca; 238 239 pca.tty = NULL; 240 pca.pri = level; 241 pca.flags = log_open ? TOLOG : TOCONS; 242 pca.p_bufr = NULL; 243 244 va_start(ap, fmt); 245 kvprintf(fmt, putchar, &pca, 10, ap); 246 va_end(ap); 247 248 msgbuftrigger = 1; 249} 250 251#define CONSCHUNK 128 252 253void 254log_console(struct uio *uio) 255{ 256 int c, i, error, nl; 257 char *consbuffer; 258 int pri; 259 260 if (!log_console_output) 261 return; 262 263 pri = LOG_INFO | LOG_CONSOLE; 264 uio = cloneuio(uio); 265 consbuffer = malloc(CONSCHUNK, M_TEMP, M_WAITOK); 266 267 nl = 0; 268 while (uio->uio_resid > 0) { 269 c = imin(uio->uio_resid, CONSCHUNK); 270 error = uiomove(consbuffer, c, uio); 271 if (error != 0) 272 break; 273 for (i = 0; i < c; i++) { 274 msglogchar(consbuffer[i], pri); 275 if (consbuffer[i] == '\n') 276 nl = 1; 277 else 278 nl = 0; 279 } 280 } 281 if (!nl) 282 msglogchar('\n', pri); 283 msgbuftrigger = 1; 284 free(uio, M_IOV); 285 free(consbuffer, M_TEMP); 286 return; 287} 288 289int 290printf(const char *fmt, ...) 291{ 292 va_list ap; 293 struct putchar_arg pca; 294 int retval; 295#ifdef PRINTF_BUFR_SIZE 296 char bufr[PRINTF_BUFR_SIZE]; 297#endif 298 299 va_start(ap, fmt); 300 pca.tty = NULL; 301 pca.flags = TOCONS | TOLOG; 302 pca.pri = -1; 303#ifdef PRINTF_BUFR_SIZE 304 pca.p_bufr = bufr; 305 pca.p_next = pca.p_bufr; 306 pca.n_bufr = sizeof(bufr); 307 pca.remain = sizeof(bufr); 308 *pca.p_next = '\0'; 309#else 310 /* Don't buffer console output. */ 311 pca.p_bufr = NULL; 312#endif 313 314 retval = kvprintf(fmt, putchar, &pca, 10, ap); 315 va_end(ap); 316 317#ifdef PRINTF_BUFR_SIZE 318 /* Write any buffered console output: */ 319 if (*pca.p_bufr != '\0') 320 cnputs(pca.p_bufr); 321#endif 322 323 if (!panicstr) 324 msgbuftrigger = 1; 325 326 return (retval); 327} 328 329int 330vprintf(const char *fmt, va_list ap) 331{ 332 struct putchar_arg pca; 333 int retval; 334#ifdef PRINTF_BUFR_SIZE 335 char bufr[PRINTF_BUFR_SIZE]; 336#endif 337 338 pca.tty = NULL; 339 pca.flags = TOCONS | TOLOG; 340 pca.pri = -1; 341#ifdef PRINTF_BUFR_SIZE 342 pca.p_bufr = bufr; 343 pca.p_next = pca.p_bufr; 344 pca.n_bufr = sizeof(bufr); 345 pca.remain = sizeof(bufr); 346 *pca.p_next = '\0'; 347#else 348 /* Don't buffer console output. */ 349 pca.p_bufr = NULL; 350#endif 351 352 retval = kvprintf(fmt, putchar, &pca, 10, ap); 353 354#ifdef PRINTF_BUFR_SIZE 355 /* Write any buffered console output: */ 356 if (*pca.p_bufr != '\0') 357 cnputs(pca.p_bufr); 358#endif 359 360 if (!panicstr) 361 msgbuftrigger = 1; 362 363 return (retval); 364} 365 366static void 367putcons(int c, struct putchar_arg *ap) 368{ 369 /* Check if no console output buffer was provided. */ 370 if (ap->p_bufr == NULL) 371 /* Output direct to the console. */ 372 cnputc(c); 373 else { 374 /* Buffer the character: */ 375 if (c == '\n') { 376 *ap->p_next++ = '\r'; 377 ap->remain--; 378 } 379 *ap->p_next++ = c; 380 ap->remain--; 381 382 /* Always leave the buffer zero terminated. */ 383 *ap->p_next = '\0'; 384 385 /* Check if the buffer needs to be flushed. */ 386 if (ap->remain < 3 || c == '\n') { 387 cnputs(ap->p_bufr); 388 ap->p_next = ap->p_bufr; 389 ap->remain = ap->n_bufr; 390 *ap->p_next = '\0'; 391 } 392 } 393} 394 395/* 396 * Print a character on console or users terminal. If destination is 397 * the console then the last bunch of characters are saved in msgbuf for 398 * inspection later. 399 */ 400static void 401putchar(int c, void *arg) 402{ 403 struct putchar_arg *ap = (struct putchar_arg*) arg; 404 struct tty *tp = ap->tty; 405 int flags = ap->flags; 406 407 /* Don't use the tty code after a panic or while in ddb. */ 408 if (kdb_active) { 409 if (c != '\0') 410 cnputc(c); 411 } else if (panicstr || ((flags & TOCONS) && constty == NULL)) { 412 if (c != '\0') 413 putcons(c, ap); 414 } else { 415 if ((flags & TOTTY) && tp != NULL) 416 tputchar(c, tp); 417 if (flags & TOCONS) { 418 if (constty != NULL) 419 msgbuf_addchar(&consmsgbuf, c); 420 if (always_console_output && c != '\0') 421 putcons(c, ap); 422 } 423 } 424 if ((flags & TOLOG)) 425 msglogchar(c, ap->pri); 426} 427 428/* 429 * Scaled down version of sprintf(3). 430 */ 431int 432sprintf(char *buf, const char *cfmt, ...) 433{ 434 int retval; 435 va_list ap; 436 437 va_start(ap, cfmt); 438 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap); 439 buf[retval] = '\0'; 440 va_end(ap); 441 return (retval); 442} 443 444/* 445 * Scaled down version of vsprintf(3). 446 */ 447int 448vsprintf(char *buf, const char *cfmt, va_list ap) 449{ 450 int retval; 451 452 retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap); 453 buf[retval] = '\0'; 454 return (retval); 455} 456 457/* 458 * Scaled down version of snprintf(3). 459 */ 460int 461snprintf(char *str, size_t size, const char *format, ...) 462{ 463 int retval; 464 va_list ap; 465 466 va_start(ap, format); 467 retval = vsnprintf(str, size, format, ap); 468 va_end(ap); 469 return(retval); 470} 471 472/* 473 * Scaled down version of vsnprintf(3). 474 */ 475int 476vsnprintf(char *str, size_t size, const char *format, va_list ap) 477{ 478 struct snprintf_arg info; 479 int retval; 480 481 info.str = str; 482 info.remain = size; 483 retval = kvprintf(format, snprintf_func, &info, 10, ap); 484 if (info.remain >= 1) 485 *info.str++ = '\0'; 486 return (retval); 487} 488 489/* 490 * Kernel version which takes radix argument vsnprintf(3). 491 */ 492int 493vsnrprintf(char *str, size_t size, int radix, const char *format, va_list ap) 494{ 495 struct snprintf_arg info; 496 int retval; 497 498 info.str = str; 499 info.remain = size; 500 retval = kvprintf(format, snprintf_func, &info, radix, ap); 501 if (info.remain >= 1) 502 *info.str++ = '\0'; 503 return (retval); 504} 505 506static void 507snprintf_func(int ch, void *arg) 508{ 509 struct snprintf_arg *const info = arg; 510 511 if (info->remain >= 2) { 512 *info->str++ = ch; 513 info->remain--; 514 } 515} 516 517/* 518 * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse 519 * order; return an optional length and a pointer to the last character 520 * written in the buffer (i.e., the first character of the string). 521 * The buffer pointed to by `nbuf' must have length >= MAXNBUF. 522 */ 523static char * 524ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper) 525{ 526 char *p, c; 527 528 p = nbuf; 529 *p = '\0'; 530 do { 531 c = hex2ascii(num % base); 532 *++p = upper ? toupper(c) : c; 533 } while (num /= base); 534 if (lenp) 535 *lenp = p - nbuf; 536 return (p); 537} 538 539/* 540 * Scaled down version of printf(3). 541 * 542 * Two additional formats: 543 * 544 * The format %b is supported to decode error registers. 545 * Its usage is: 546 * 547 * printf("reg=%b\n", regval, "<base><arg>*"); 548 * 549 * where <base> is the output base expressed as a control character, e.g. 550 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters, 551 * the first of which gives the bit number to be inspected (origin 1), and 552 * the next characters (up to a control character, i.e. a character <= 32), 553 * give the name of the register. Thus: 554 * 555 * kvprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n"); 556 * 557 * would produce output: 558 * 559 * reg=3<BITTWO,BITONE> 560 * 561 * XXX: %D -- Hexdump, takes pointer and separator string: 562 * ("%6D", ptr, ":") -> XX:XX:XX:XX:XX:XX 563 * ("%*D", len, ptr, " " -> XX XX XX XX ... 564 */ 565int 566kvprintf(char const *fmt, void (*func)(int, void*), void *arg, int radix, va_list ap) 567{ 568#define PCHAR(c) {int cc=(c); if (func) (*func)(cc,arg); else *d++ = cc; retval++; } 569 char nbuf[MAXNBUF]; 570 char *d; 571 const char *p, *percent, *q; 572 u_char *up; 573 int ch, n; 574 uintmax_t num; 575 int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot; 576 int cflag, hflag, jflag, tflag, zflag; 577 int dwidth, upper; 578 char padc; 579 int stop = 0, retval = 0; 580 581 num = 0; 582 if (!func) 583 d = (char *) arg; 584 else 585 d = NULL; 586 587 if (fmt == NULL) 588 fmt = "(fmt null)\n"; 589 590 if (radix < 2 || radix > 36) 591 radix = 10; 592 593 for (;;) { 594 padc = ' '; 595 width = 0; 596 while ((ch = (u_char)*fmt++) != '%' || stop) { 597 if (ch == '\0') 598 return (retval); 599 PCHAR(ch); 600 } 601 percent = fmt - 1; 602 qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0; 603 sign = 0; dot = 0; dwidth = 0; upper = 0; 604 cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 0; 605reswitch: switch (ch = (u_char)*fmt++) { 606 case '.': 607 dot = 1; 608 goto reswitch; 609 case '#': 610 sharpflag = 1; 611 goto reswitch; 612 case '+': 613 sign = 1; 614 goto reswitch; 615 case '-': 616 ladjust = 1; 617 goto reswitch; 618 case '%': 619 PCHAR(ch); 620 break; 621 case '*': 622 if (!dot) { 623 width = va_arg(ap, int); 624 if (width < 0) { 625 ladjust = !ladjust; 626 width = -width; 627 } 628 } else { 629 dwidth = va_arg(ap, int); 630 } 631 goto reswitch; 632 case '0': 633 if (!dot) { 634 padc = '0'; 635 goto reswitch; 636 } 637 case '1': case '2': case '3': case '4': 638 case '5': case '6': case '7': case '8': case '9': 639 for (n = 0;; ++fmt) { 640 n = n * 10 + ch - '0'; 641 ch = *fmt; 642 if (ch < '0' || ch > '9') 643 break; 644 } 645 if (dot) 646 dwidth = n; 647 else 648 width = n; 649 goto reswitch; 650 case 'b': 651 num = (u_int)va_arg(ap, int); 652 p = va_arg(ap, char *); 653 for (q = ksprintn(nbuf, num, *p++, NULL, 0); *q;) 654 PCHAR(*q--); 655 656 if (num == 0) 657 break; 658 659 for (tmp = 0; *p;) { 660 n = *p++; 661 if (num & (1 << (n - 1))) { 662 PCHAR(tmp ? ',' : '<'); 663 for (; (n = *p) > ' '; ++p) 664 PCHAR(n); 665 tmp = 1; 666 } else 667 for (; *p > ' '; ++p) 668 continue; 669 } 670 if (tmp) 671 PCHAR('>'); 672 break; 673 case 'c': 674 PCHAR(va_arg(ap, int)); 675 break; 676 case 'D': 677 up = va_arg(ap, u_char *); 678 p = va_arg(ap, char *); 679 if (!width) 680 width = 16; 681 while(width--) { 682 PCHAR(hex2ascii(*up >> 4)); 683 PCHAR(hex2ascii(*up & 0x0f)); 684 up++; 685 if (width) 686 for (q=p;*q;q++) 687 PCHAR(*q); 688 } 689 break; 690 case 'd': 691 case 'i': 692 base = 10; 693 sign = 1; 694 goto handle_sign; 695 case 'h': 696 if (hflag) { 697 hflag = 0; 698 cflag = 1; 699 } else 700 hflag = 1; 701 goto reswitch; 702 case 'j': 703 jflag = 1; 704 goto reswitch; 705 case 'l': 706 if (lflag) { 707 lflag = 0; 708 qflag = 1; 709 } else 710 lflag = 1; 711 goto reswitch; 712 case 'n': 713 if (jflag) 714 *(va_arg(ap, intmax_t *)) = retval; 715 else if (qflag) 716 *(va_arg(ap, quad_t *)) = retval; 717 else if (lflag) 718 *(va_arg(ap, long *)) = retval; 719 else if (zflag) 720 *(va_arg(ap, size_t *)) = retval; 721 else if (hflag) 722 *(va_arg(ap, short *)) = retval; 723 else if (cflag) 724 *(va_arg(ap, char *)) = retval; 725 else 726 *(va_arg(ap, int *)) = retval; 727 break; 728 case 'o': 729 base = 8; 730 goto handle_nosign; 731 case 'p': 732 base = 16; 733 sharpflag = (width == 0); 734 sign = 0; 735 num = (uintptr_t)va_arg(ap, void *); 736 goto number; 737 case 'q': 738 qflag = 1; 739 goto reswitch; 740 case 'r': 741 base = radix; 742 if (sign) 743 goto handle_sign; 744 goto handle_nosign; 745 case 's': 746 p = va_arg(ap, char *); 747 if (p == NULL) 748 p = "(null)"; 749 if (!dot) 750 n = strlen (p); 751 else 752 for (n = 0; n < dwidth && p[n]; n++) 753 continue; 754 755 width -= n; 756 757 if (!ladjust && width > 0) 758 while (width--) 759 PCHAR(padc); 760 while (n--) 761 PCHAR(*p++); 762 if (ladjust && width > 0) 763 while (width--) 764 PCHAR(padc); 765 break; 766 case 't': 767 tflag = 1; 768 goto reswitch; 769 case 'u': 770 base = 10; 771 goto handle_nosign; 772 case 'X': 773 upper = 1; 774 case 'x': 775 base = 16; 776 goto handle_nosign; 777 case 'y': 778 base = 16; 779 sign = 1; 780 goto handle_sign; 781 case 'z': 782 zflag = 1; 783 goto reswitch; 784handle_nosign: 785 sign = 0; 786 if (jflag) 787 num = va_arg(ap, uintmax_t); 788 else if (qflag) 789 num = va_arg(ap, u_quad_t); 790 else if (tflag) 791 num = va_arg(ap, ptrdiff_t); 792 else if (lflag) 793 num = va_arg(ap, u_long); 794 else if (zflag) 795 num = va_arg(ap, size_t); 796 else if (hflag) 797 num = (u_short)va_arg(ap, int); 798 else if (cflag) 799 num = (u_char)va_arg(ap, int); 800 else 801 num = va_arg(ap, u_int); 802 goto number; 803handle_sign: 804 if (jflag) 805 num = va_arg(ap, intmax_t); 806 else if (qflag) 807 num = va_arg(ap, quad_t); 808 else if (tflag) 809 num = va_arg(ap, ptrdiff_t); 810 else if (lflag) 811 num = va_arg(ap, long); 812 else if (zflag) 813 num = va_arg(ap, size_t); 814 else if (hflag) 815 num = (short)va_arg(ap, int); 816 else if (cflag) 817 num = (char)va_arg(ap, int); 818 else 819 num = va_arg(ap, int); 820number: 821 if (sign && (intmax_t)num < 0) { 822 neg = 1; 823 num = -(intmax_t)num; 824 } 825 p = ksprintn(nbuf, num, base, &tmp, upper); 826 if (sharpflag && num != 0) { 827 if (base == 8) 828 tmp++; 829 else if (base == 16) 830 tmp += 2; 831 } 832 if (neg) 833 tmp++; 834 835 if (!ladjust && padc != '0' && width 836 && (width -= tmp) > 0) 837 while (width--) 838 PCHAR(padc); 839 if (neg) 840 PCHAR('-'); 841 if (sharpflag && num != 0) { 842 if (base == 8) { 843 PCHAR('0'); 844 } else if (base == 16) { 845 PCHAR('0'); 846 PCHAR('x'); 847 } 848 } 849 if (!ladjust && width && (width -= tmp) > 0) 850 while (width--) 851 PCHAR(padc); 852 853 while (*p) 854 PCHAR(*p--); 855 856 if (ladjust && width && (width -= tmp) > 0) 857 while (width--) 858 PCHAR(padc); 859 860 break; 861 default: 862 while (percent < fmt) 863 PCHAR(*percent++); 864 /* 865 * Since we ignore an formatting argument it is no 866 * longer safe to obey the remaining formatting 867 * arguments as the arguments will no longer match 868 * the format specs. 869 */ 870 stop = 1; 871 break; 872 } 873 } 874#undef PCHAR 875} 876 877/* 878 * Put character in log buffer with a particular priority. 879 */ 880static void 881msglogchar(int c, int pri) 882{ 883 static int lastpri = -1; 884 static int dangling; 885 char nbuf[MAXNBUF]; 886 char *p; 887 888 if (!msgbufmapped) 889 return; 890 if (c == '\0' || c == '\r') 891 return; 892 if (pri != -1 && pri != lastpri) { 893 if (dangling) { 894 msgbuf_addchar(msgbufp, '\n'); 895 dangling = 0; 896 } 897 msgbuf_addchar(msgbufp, '<'); 898 for (p = ksprintn(nbuf, (uintmax_t)pri, 10, NULL, 0); *p;) 899 msgbuf_addchar(msgbufp, *p--); 900 msgbuf_addchar(msgbufp, '>'); 901 lastpri = pri; 902 } 903 msgbuf_addchar(msgbufp, c); 904 if (c == '\n') { 905 dangling = 0; 906 lastpri = -1; 907 } else { 908 dangling = 1; 909 } 910} 911 912void 913msgbufinit(void *ptr, int size) 914{ 915 char *cp; 916 static struct msgbuf *oldp = NULL; 917 918 size -= sizeof(*msgbufp); 919 cp = (char *)ptr; 920 msgbufp = (struct msgbuf *)(cp + size); 921 msgbuf_reinit(msgbufp, cp, size); 922 if (msgbufmapped && oldp != msgbufp) 923 msgbuf_copy(oldp, msgbufp); 924 msgbufmapped = 1; 925 oldp = msgbufp; 926} 927 928static int unprivileged_read_msgbuf = 1; 929SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_read_msgbuf, 930 CTLFLAG_RW, &unprivileged_read_msgbuf, 0, 931 "Unprivileged processes may read the kernel message buffer"); 932 933/* Sysctls for accessing/clearing the msgbuf */ 934static int 935sysctl_kern_msgbuf(SYSCTL_HANDLER_ARGS) 936{ 937 char buf[128]; 938 u_int seq; 939 int error, len; 940 941 if (!unprivileged_read_msgbuf) { 942 error = priv_check(req->td, PRIV_MSGBUF); 943 if (error) 944 return (error); 945 } 946 947 /* Read the whole buffer, one chunk at a time. */ 948 msgbuf_peekbytes(msgbufp, NULL, 0, &seq); 949 while ((len = msgbuf_peekbytes(msgbufp, buf, sizeof(buf), &seq)) > 0) { 950 error = sysctl_handle_opaque(oidp, buf, len, req); 951 if (error) 952 return (error); 953 } 954 return (0); 955} 956 957SYSCTL_PROC(_kern, OID_AUTO, msgbuf, CTLTYPE_STRING | CTLFLAG_RD, 958 0, 0, sysctl_kern_msgbuf, "A", "Contents of kernel message buffer"); 959 960static int msgbuf_clearflag; 961 962static int 963sysctl_kern_msgbuf_clear(SYSCTL_HANDLER_ARGS) 964{ 965 int error; 966 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req); 967 if (!error && req->newptr) { 968 msgbuf_clear(msgbufp); 969 msgbuf_clearflag = 0; 970 } 971 return (error); 972} 973 974SYSCTL_PROC(_kern, OID_AUTO, msgbuf_clear, 975 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE, &msgbuf_clearflag, 0, 976 sysctl_kern_msgbuf_clear, "I", "Clear kernel message buffer"); 977 978#ifdef DDB 979 980DB_SHOW_COMMAND(msgbuf, db_show_msgbuf) 981{ 982 int i, j; 983 984 if (!msgbufmapped) { 985 db_printf("msgbuf not mapped yet\n"); 986 return; 987 } 988 db_printf("msgbufp = %p\n", msgbufp); 989 db_printf("magic = %x, size = %d, r= %u, w = %u, ptr = %p, cksum= %u\n", 990 msgbufp->msg_magic, msgbufp->msg_size, msgbufp->msg_rseq, 991 msgbufp->msg_wseq, msgbufp->msg_ptr, msgbufp->msg_cksum); 992 for (i = 0; i < msgbufp->msg_size && !db_pager_quit; i++) { 993 j = MSGBUF_SEQ_TO_POS(msgbufp, i + msgbufp->msg_rseq); 994 db_printf("%c", msgbufp->msg_ptr[j]); 995 } 996 db_printf("\n"); 997} 998 999#endif /* DDB */ 1000 1001void 1002hexdump(const void *ptr, int length, const char *hdr, int flags) 1003{ 1004 int i, j, k; 1005 int cols; 1006 const unsigned char *cp; 1007 char delim; 1008 1009 if ((flags & HD_DELIM_MASK) != 0) 1010 delim = (flags & HD_DELIM_MASK) >> 8; 1011 else 1012 delim = ' '; 1013 1014 if ((flags & HD_COLUMN_MASK) != 0) 1015 cols = flags & HD_COLUMN_MASK; 1016 else 1017 cols = 16; 1018 1019 cp = ptr; 1020 for (i = 0; i < length; i+= cols) { 1021 if (hdr != NULL) 1022 printf("%s", hdr); 1023 1024 if ((flags & HD_OMIT_COUNT) == 0) 1025 printf("%04x ", i); 1026 1027 if ((flags & HD_OMIT_HEX) == 0) { 1028 for (j = 0; j < cols; j++) { 1029 k = i + j; 1030 if (k < length) 1031 printf("%c%02x", delim, cp[k]); 1032 else 1033 printf(" "); 1034 } 1035 } 1036 1037 if ((flags & HD_OMIT_CHARS) == 0) { 1038 printf(" |"); 1039 for (j = 0; j < cols; j++) { 1040 k = i + j; 1041 if (k >= length) 1042 printf(" "); 1043 else if (cp[k] >= ' ' && cp[k] <= '~') 1044 printf("%c", cp[k]); 1045 else 1046 printf("."); 1047 } 1048 printf("|"); 1049 } 1050 printf("\n"); 1051 } 1052} 1053 1054