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FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_prf.c
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1 /* $NetBSD: subr_prf.c,v 1.103 2006/09/03 17:06:36 martin Exp $ */ 2 3 /*- 4 * Copyright (c) 1986, 1988, 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)subr_prf.c 8.4 (Berkeley) 5/4/95 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: subr_prf.c,v 1.103 2006/09/03 17:06:36 martin Exp $"); 41 42 #include "opt_ddb.h" 43 #include "opt_ipkdb.h" 44 #include "opt_kgdb.h" 45 #include "opt_multiprocessor.h" 46 #include "opt_dump.h" 47 48 #include <sys/param.h> 49 #include <sys/stdint.h> 50 #include <sys/systm.h> 51 #include <sys/buf.h> 52 #include <sys/reboot.h> 53 #include <sys/msgbuf.h> 54 #include <sys/proc.h> 55 #include <sys/ioctl.h> 56 #include <sys/vnode.h> 57 #include <sys/file.h> 58 #include <sys/tty.h> 59 #include <sys/tprintf.h> 60 #include <sys/syslog.h> 61 #include <sys/malloc.h> 62 #include <sys/lock.h> 63 #include <sys/kprintf.h> 64 65 #include <dev/cons.h> 66 67 #ifdef DDB 68 #include <ddb/ddbvar.h> 69 #include <machine/db_machdep.h> 70 #include <ddb/db_command.h> 71 #include <ddb/db_interface.h> 72 #endif 73 74 #ifdef IPKDB 75 #include <ipkdb/ipkdb.h> 76 #endif 77 78 #if defined(MULTIPROCESSOR) 79 struct simplelock kprintf_slock = SIMPLELOCK_INITIALIZER; 80 #endif /* MULTIPROCESSOR */ 81 82 /* 83 * note that stdarg.h and the ansi style va_start macro is used for both 84 * ansi and traditional c complers. 85 * XXX: this requires that stdarg.h define: va_alist and va_dcl 86 */ 87 #include <machine/stdarg.h> 88 89 90 #ifdef KGDB 91 #include <sys/kgdb.h> 92 #include <machine/cpu.h> 93 #endif 94 #ifdef DDB 95 #include <ddb/db_output.h> /* db_printf, db_putchar prototypes */ 96 #endif 97 98 99 /* 100 * defines 101 */ 102 103 /* max size buffer kprintf needs to print quad_t [size in base 8 + \0] */ 104 #define KPRINTF_BUFSIZE (sizeof(quad_t) * NBBY / 3 + 2) 105 106 107 /* 108 * local prototypes 109 */ 110 111 static void putchar(int, int, struct tty *); 112 113 114 /* 115 * globals 116 */ 117 118 extern struct tty *constty; /* pointer to console "window" tty */ 119 extern int log_open; /* subr_log: is /dev/klog open? */ 120 const char *panicstr; /* arg to first call to panic (used as a flag 121 to indicate that panic has already been called). */ 122 long panicstart, panicend; /* position in the msgbuf of the start and 123 end of the formatted panicstr. */ 124 int doing_shutdown; /* set to indicate shutdown in progress */ 125 126 #ifndef DUMP_ON_PANIC 127 #define DUMP_ON_PANIC 1 128 #endif 129 int dumponpanic = DUMP_ON_PANIC; 130 131 /* 132 * v_putc: routine to putc on virtual console 133 * 134 * the v_putc pointer can be used to redirect the console cnputc elsewhere 135 * [e.g. to a "virtual console"]. 136 */ 137 138 void (*v_putc)(int) = cnputc; /* start with cnputc (normal cons) */ 139 void (*v_flush)(void) = cnflush; /* start with cnflush (normal cons) */ 140 141 const char hexdigits[] = "0123456789abcdef"; 142 const char HEXDIGITS[] = "0123456789ABCDEF"; 143 144 145 /* 146 * functions 147 */ 148 149 /* 150 * tablefull: warn that a system table is full 151 */ 152 153 void 154 tablefull(const char *tab, const char *hint) 155 { 156 if (hint) 157 log(LOG_ERR, "%s: table is full - %s\n", tab, hint); 158 else 159 log(LOG_ERR, "%s: table is full\n", tab); 160 } 161 162 /* 163 * twiddle: spin a little propellor on the console. 164 */ 165 166 void 167 twiddle(void) 168 { 169 static const char twiddle_chars[] = "|/-\\"; 170 static int pos; 171 int s; 172 173 KPRINTF_MUTEX_ENTER(s); 174 175 putchar(twiddle_chars[pos++ & 3], TOCONS, NULL); 176 putchar('\b', TOCONS, NULL); 177 178 KPRINTF_MUTEX_EXIT(s); 179 } 180 181 /* 182 * panic: handle an unresolvable fatal error 183 * 184 * prints "panic: <message>" and reboots. if called twice (i.e. recursive 185 * call) we avoid trying to sync the disk and just reboot (to avoid 186 * recursive panics). 187 */ 188 189 void 190 panic(const char *fmt, ...) 191 { 192 int bootopt; 193 va_list ap; 194 195 bootopt = RB_AUTOBOOT; 196 if (dumponpanic) 197 bootopt |= RB_DUMP; 198 if (doing_shutdown) 199 bootopt |= RB_NOSYNC; 200 if (!panicstr) 201 panicstr = fmt; 202 doing_shutdown = 1; 203 204 if (msgbufenabled && msgbufp->msg_magic == MSG_MAGIC) 205 panicstart = msgbufp->msg_bufx; 206 207 va_start(ap, fmt); 208 printf("panic: "); 209 vprintf(fmt, ap); 210 printf("\n"); 211 va_end(ap); 212 213 if (msgbufenabled && msgbufp->msg_magic == MSG_MAGIC) 214 panicend = msgbufp->msg_bufx; 215 216 #ifdef IPKDB 217 ipkdb_panic(); 218 #endif 219 #ifdef KGDB 220 kgdb_panic(); 221 #endif 222 #ifdef KADB 223 if (boothowto & RB_KDB) 224 kdbpanic(); 225 #endif 226 #ifdef DDB 227 if (db_onpanic == 1) 228 Debugger(); 229 else if (db_onpanic >= 0) { 230 static int intrace = 0; 231 232 if (intrace == 0) { 233 intrace = 1; 234 printf("Begin traceback...\n"); 235 db_stack_trace_print( 236 (db_expr_t)(intptr_t)__builtin_frame_address(0), 237 TRUE, 65535, "", printf); 238 printf("End traceback...\n"); 239 intrace = 0; 240 } else 241 printf("Faulted in mid-traceback; aborting..."); 242 if (db_onpanic == 2) 243 Debugger(); 244 } 245 #endif 246 cpu_reboot(bootopt, NULL); 247 } 248 249 /* 250 * kernel logging functions: log, logpri, addlog 251 */ 252 253 /* 254 * log: write to the log buffer 255 * 256 * => will not sleep [so safe to call from interrupt] 257 * => will log to console if /dev/klog isn't open 258 */ 259 260 void 261 log(int level, const char *fmt, ...) 262 { 263 int s; 264 va_list ap; 265 266 KPRINTF_MUTEX_ENTER(s); 267 268 klogpri(level); /* log the level first */ 269 va_start(ap, fmt); 270 kprintf(fmt, TOLOG, NULL, NULL, ap); 271 va_end(ap); 272 if (!log_open) { 273 va_start(ap, fmt); 274 kprintf(fmt, TOCONS, NULL, NULL, ap); 275 va_end(ap); 276 } 277 278 KPRINTF_MUTEX_EXIT(s); 279 280 logwakeup(); /* wake up anyone waiting for log msgs */ 281 } 282 283 /* 284 * vlog: write to the log buffer [already have va_alist] 285 */ 286 287 void 288 vlog(int level, const char *fmt, va_list ap) 289 { 290 int s; 291 292 KPRINTF_MUTEX_ENTER(s); 293 294 klogpri(level); /* log the level first */ 295 kprintf(fmt, TOLOG, NULL, NULL, ap); 296 if (!log_open) 297 kprintf(fmt, TOCONS, NULL, NULL, ap); 298 299 KPRINTF_MUTEX_EXIT(s); 300 301 logwakeup(); /* wake up anyone waiting for log msgs */ 302 } 303 304 /* 305 * logpri: log the priority level to the klog 306 */ 307 308 void 309 logpri(int level) 310 { 311 int s; 312 313 KPRINTF_MUTEX_ENTER(s); 314 klogpri(level); 315 KPRINTF_MUTEX_EXIT(s); 316 } 317 318 /* 319 * Note: we must be in the mutex here! 320 */ 321 void 322 klogpri(int level) 323 { 324 char *p; 325 char snbuf[KPRINTF_BUFSIZE]; 326 327 putchar('<', TOLOG, NULL); 328 snprintf(snbuf, sizeof(snbuf), "%d", level); 329 for (p = snbuf ; *p ; p++) 330 putchar(*p, TOLOG, NULL); 331 putchar('>', TOLOG, NULL); 332 } 333 334 /* 335 * addlog: add info to previous log message 336 */ 337 338 void 339 addlog(const char *fmt, ...) 340 { 341 int s; 342 va_list ap; 343 344 KPRINTF_MUTEX_ENTER(s); 345 346 va_start(ap, fmt); 347 kprintf(fmt, TOLOG, NULL, NULL, ap); 348 va_end(ap); 349 if (!log_open) { 350 va_start(ap, fmt); 351 kprintf(fmt, TOCONS, NULL, NULL, ap); 352 va_end(ap); 353 } 354 355 KPRINTF_MUTEX_EXIT(s); 356 357 logwakeup(); 358 } 359 360 361 /* 362 * putchar: print a single character on console or user terminal. 363 * 364 * => if console, then the last MSGBUFS chars are saved in msgbuf 365 * for inspection later (e.g. dmesg/syslog) 366 * => we must already be in the mutex! 367 */ 368 static void 369 putchar(int c, int flags, struct tty *tp) 370 { 371 struct kern_msgbuf *mbp; 372 373 if (panicstr) 374 constty = NULL; 375 if ((flags & TOCONS) && tp == NULL && constty) { 376 tp = constty; 377 flags |= TOTTY; 378 } 379 if ((flags & TOTTY) && tp && 380 tputchar(c, flags, tp) < 0 && 381 (flags & TOCONS) && tp == constty) 382 constty = NULL; 383 if ((flags & TOLOG) && 384 c != '\0' && c != '\r' && c != 0177 && msgbufenabled) { 385 mbp = msgbufp; 386 if (mbp->msg_magic != MSG_MAGIC) { 387 /* 388 * Arguably should panic or somehow notify the 389 * user... but how? Panic may be too drastic, 390 * and would obliterate the message being kicked 391 * out (maybe a panic itself), and printf 392 * would invoke us recursively. Silently punt 393 * for now. If syslog is running, it should 394 * notice. 395 */ 396 msgbufenabled = 0; 397 } else { 398 mbp->msg_bufc[mbp->msg_bufx++] = c; 399 if (mbp->msg_bufx < 0 || mbp->msg_bufx >= mbp->msg_bufs) 400 mbp->msg_bufx = 0; 401 /* If the buffer is full, keep the most recent data. */ 402 if (mbp->msg_bufr == mbp->msg_bufx) { 403 if (++mbp->msg_bufr >= mbp->msg_bufs) 404 mbp->msg_bufr = 0; 405 } 406 } 407 } 408 if ((flags & TOCONS) && constty == NULL && c != '\0') 409 (*v_putc)(c); 410 #ifdef DDB 411 if (flags & TODDB) 412 db_putchar(c); 413 #endif 414 } 415 416 417 /* 418 * uprintf: print to the controlling tty of the current process 419 * 420 * => we may block if the tty queue is full 421 * => no message is printed if the queue doesn't clear in a reasonable 422 * time 423 */ 424 425 void 426 uprintf(const char *fmt, ...) 427 { 428 struct proc *p = curproc; 429 va_list ap; 430 431 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) { 432 /* No mutex needed; going to process TTY. */ 433 va_start(ap, fmt); 434 kprintf(fmt, TOTTY, p->p_session->s_ttyp, NULL, ap); 435 va_end(ap); 436 } 437 } 438 439 /* 440 * tprintf functions: used to send messages to a specific process 441 * 442 * usage: 443 * get a tpr_t handle on a process "p" by using "tprintf_open(p)" 444 * use the handle when calling "tprintf" 445 * when done, do a "tprintf_close" to drop the handle 446 */ 447 448 /* 449 * tprintf_open: get a tprintf handle on a process "p" 450 * 451 * => returns NULL if process can't be printed to 452 */ 453 454 tpr_t 455 tprintf_open(struct proc *p) 456 { 457 458 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) { 459 SESSHOLD(p->p_session); 460 return ((tpr_t) p->p_session); 461 } 462 return ((tpr_t) NULL); 463 } 464 465 /* 466 * tprintf_close: dispose of a tprintf handle obtained with tprintf_open 467 */ 468 469 void 470 tprintf_close(tpr_t sess) 471 { 472 473 if (sess) 474 SESSRELE((struct session *) sess); 475 } 476 477 /* 478 * tprintf: given tprintf handle to a process [obtained with tprintf_open], 479 * send a message to the controlling tty for that process. 480 * 481 * => also sends message to /dev/klog 482 */ 483 void 484 tprintf(tpr_t tpr, const char *fmt, ...) 485 { 486 struct session *sess = (struct session *)tpr; 487 struct tty *tp = NULL; 488 int s, flags = TOLOG; 489 va_list ap; 490 491 if (sess && sess->s_ttyvp && ttycheckoutq(sess->s_ttyp, 0)) { 492 flags |= TOTTY; 493 tp = sess->s_ttyp; 494 } 495 496 KPRINTF_MUTEX_ENTER(s); 497 498 klogpri(LOG_INFO); 499 va_start(ap, fmt); 500 kprintf(fmt, flags, tp, NULL, ap); 501 va_end(ap); 502 503 KPRINTF_MUTEX_EXIT(s); 504 505 logwakeup(); 506 } 507 508 509 /* 510 * ttyprintf: send a message to a specific tty 511 * 512 * => should be used only by tty driver or anything that knows the 513 * underlying tty will not be revoked(2)'d away. [otherwise, 514 * use tprintf] 515 */ 516 void 517 ttyprintf(struct tty *tp, const char *fmt, ...) 518 { 519 va_list ap; 520 521 /* No mutex needed; going to process TTY. */ 522 va_start(ap, fmt); 523 kprintf(fmt, TOTTY, tp, NULL, ap); 524 va_end(ap); 525 } 526 527 #ifdef DDB 528 529 /* 530 * db_printf: printf for DDB (via db_putchar) 531 */ 532 533 void 534 db_printf(const char *fmt, ...) 535 { 536 va_list ap; 537 538 /* No mutex needed; DDB pauses all processors. */ 539 va_start(ap, fmt); 540 kprintf(fmt, TODDB, NULL, NULL, ap); 541 va_end(ap); 542 543 if (db_tee_msgbuf) { 544 va_start(ap, fmt); 545 kprintf(fmt, TOLOG, NULL, NULL, ap); 546 va_end(ap); 547 }; 548 } 549 550 void 551 db_vprintf(const char *fmt, va_list ap) 552 { 553 554 /* No mutex needed; DDB pauses all processors. */ 555 kprintf(fmt, TODDB, NULL, NULL, ap); 556 if (db_tee_msgbuf) 557 kprintf(fmt, TOLOG, NULL, NULL, ap); 558 } 559 560 #endif /* DDB */ 561 562 /* 563 * Device autoconfiguration printf routines. These change their 564 * behavior based on the AB_* flags in boothowto. If AB_SILENT 565 * is set, messages never go to the console (but they still always 566 * go to the log). AB_VERBOSE overrides AB_SILENT. 567 */ 568 569 /* 570 * aprint_normal: Send to console unless AB_QUIET. Always goes 571 * to the log. 572 */ 573 void 574 aprint_normal(const char *fmt, ...) 575 { 576 va_list ap; 577 int s, flags = TOLOG; 578 579 if ((boothowto & (AB_SILENT|AB_QUIET)) == 0 || 580 (boothowto & AB_VERBOSE) != 0) 581 flags |= TOCONS; 582 583 KPRINTF_MUTEX_ENTER(s); 584 585 va_start(ap, fmt); 586 kprintf(fmt, flags, NULL, NULL, ap); 587 va_end(ap); 588 589 KPRINTF_MUTEX_EXIT(s); 590 591 if (!panicstr) 592 logwakeup(); 593 } 594 595 /* 596 * aprint_error: Send to console unless AB_QUIET. Always goes 597 * to the log. Also counts the number of times called so other 598 * parts of the kernel can report the number of errors during a 599 * given phase of system startup. 600 */ 601 static int aprint_error_count; 602 603 int 604 aprint_get_error_count(void) 605 { 606 int count, s; 607 608 KPRINTF_MUTEX_ENTER(s); 609 610 count = aprint_error_count; 611 aprint_error_count = 0; 612 613 KPRINTF_MUTEX_EXIT(s); 614 615 return (count); 616 } 617 618 void 619 aprint_error(const char *fmt, ...) 620 { 621 va_list ap; 622 int s, flags = TOLOG; 623 624 if ((boothowto & (AB_SILENT|AB_QUIET)) == 0 || 625 (boothowto & AB_VERBOSE) != 0) 626 flags |= TOCONS; 627 628 KPRINTF_MUTEX_ENTER(s); 629 630 aprint_error_count++; 631 632 va_start(ap, fmt); 633 kprintf(fmt, flags, NULL, NULL, ap); 634 va_end(ap); 635 636 KPRINTF_MUTEX_EXIT(s); 637 638 if (!panicstr) 639 logwakeup(); 640 } 641 642 /* 643 * aprint_naive: Send to console only if AB_QUIET. Never goes 644 * to the log. 645 */ 646 void 647 aprint_naive(const char *fmt, ...) 648 { 649 va_list ap; 650 int s; 651 652 if ((boothowto & (AB_QUIET|AB_SILENT|AB_VERBOSE)) == AB_QUIET) { 653 KPRINTF_MUTEX_ENTER(s); 654 655 va_start(ap, fmt); 656 kprintf(fmt, TOCONS, NULL, NULL, ap); 657 va_end(ap); 658 659 KPRINTF_MUTEX_EXIT(s); 660 } 661 } 662 663 /* 664 * aprint_verbose: Send to console only if AB_VERBOSE. Always 665 * goes to the log. 666 */ 667 void 668 aprint_verbose(const char *fmt, ...) 669 { 670 va_list ap; 671 int s, flags = TOLOG; 672 673 if (boothowto & AB_VERBOSE) 674 flags |= TOCONS; 675 676 KPRINTF_MUTEX_ENTER(s); 677 678 va_start(ap, fmt); 679 kprintf(fmt, flags, NULL, NULL, ap); 680 va_end(ap); 681 682 KPRINTF_MUTEX_EXIT(s); 683 684 if (!panicstr) 685 logwakeup(); 686 } 687 688 /* 689 * aprint_debug: Send to console and log only if AB_DEBUG. 690 */ 691 void 692 aprint_debug(const char *fmt, ...) 693 { 694 va_list ap; 695 int s; 696 697 if (boothowto & AB_DEBUG) { 698 KPRINTF_MUTEX_ENTER(s); 699 700 va_start(ap, fmt); 701 kprintf(fmt, TOCONS | TOLOG, NULL, NULL, ap); 702 va_end(ap); 703 704 KPRINTF_MUTEX_EXIT(s); 705 } 706 } 707 708 /* 709 * printf_nolog: Like printf(), but does not send message to the log. 710 */ 711 712 void 713 printf_nolog(const char *fmt, ...) 714 { 715 va_list ap; 716 int s; 717 718 KPRINTF_MUTEX_ENTER(s); 719 720 va_start(ap, fmt); 721 kprintf(fmt, TOCONS, NULL, NULL, ap); 722 va_end(ap); 723 724 KPRINTF_MUTEX_EXIT(s); 725 } 726 727 /* 728 * normal kernel printf functions: printf, vprintf, snprintf, vsnprintf 729 */ 730 731 /* 732 * printf: print a message to the console and the log 733 */ 734 void 735 printf(const char *fmt, ...) 736 { 737 va_list ap; 738 int s; 739 740 KPRINTF_MUTEX_ENTER(s); 741 742 va_start(ap, fmt); 743 kprintf(fmt, TOCONS | TOLOG, NULL, NULL, ap); 744 va_end(ap); 745 746 KPRINTF_MUTEX_EXIT(s); 747 748 if (!panicstr) 749 logwakeup(); 750 } 751 752 /* 753 * vprintf: print a message to the console and the log [already have 754 * va_alist] 755 */ 756 757 void 758 vprintf(const char *fmt, va_list ap) 759 { 760 int s; 761 762 KPRINTF_MUTEX_ENTER(s); 763 764 kprintf(fmt, TOCONS | TOLOG, NULL, NULL, ap); 765 766 KPRINTF_MUTEX_EXIT(s); 767 768 if (!panicstr) 769 logwakeup(); 770 } 771 772 /* 773 * sprintf: print a message to a buffer 774 */ 775 int 776 sprintf(char *bf, const char *fmt, ...) 777 { 778 int retval; 779 va_list ap; 780 781 va_start(ap, fmt); 782 retval = kprintf(fmt, TOBUFONLY, NULL, bf, ap); 783 va_end(ap); 784 *(bf + retval) = 0; /* null terminate */ 785 return(retval); 786 } 787 788 /* 789 * vsprintf: print a message to a buffer [already have va_alist] 790 */ 791 792 int 793 vsprintf(char *bf, const char *fmt, va_list ap) 794 { 795 int retval; 796 797 retval = kprintf(fmt, TOBUFONLY, NULL, bf, ap); 798 *(bf + retval) = 0; /* null terminate */ 799 return (retval); 800 } 801 802 /* 803 * snprintf: print a message to a buffer 804 */ 805 int 806 snprintf(char *bf, size_t size, const char *fmt, ...) 807 { 808 int retval; 809 va_list ap; 810 char *p; 811 812 if (size < 1) 813 return (-1); 814 p = bf + size - 1; 815 va_start(ap, fmt); 816 retval = kprintf(fmt, TOBUFONLY, &p, bf, ap); 817 va_end(ap); 818 *(p) = 0; /* null terminate */ 819 return(retval); 820 } 821 822 /* 823 * vsnprintf: print a message to a buffer [already have va_alist] 824 */ 825 int 826 vsnprintf(char *bf, size_t size, const char *fmt, va_list ap) 827 { 828 int retval; 829 char *p; 830 831 if (size < 1) 832 return (-1); 833 p = bf + size - 1; 834 retval = kprintf(fmt, TOBUFONLY, &p, bf, ap); 835 *(p) = 0; /* null terminate */ 836 return(retval); 837 } 838 839 /* 840 * bitmask_snprintf: print an interpreted bitmask to a buffer 841 * 842 * => returns pointer to the buffer 843 */ 844 char * 845 bitmask_snprintf(u_quad_t val, const char *p, char *bf, size_t buflen) 846 { 847 char *bp, *q; 848 size_t left; 849 const char *sbase; 850 char snbuf[KPRINTF_BUFSIZE]; 851 int base, bit, ch, len, sep; 852 u_quad_t field; 853 854 bp = bf; 855 memset(bf, 0, buflen); 856 857 /* 858 * Always leave room for the trailing NULL. 859 */ 860 left = buflen - 1; 861 862 /* 863 * Print the value into the buffer. Abort if there's not 864 * enough room. 865 */ 866 if (buflen < KPRINTF_BUFSIZE) 867 return (bf); 868 869 ch = *p++; 870 base = ch != '\177' ? ch : *p++; 871 sbase = base == 8 ? "%qo" : base == 10 ? "%qd" : base == 16 ? "%qx" : 0; 872 if (sbase == 0) 873 return (bf); /* punt if not oct, dec, or hex */ 874 875 snprintf(snbuf, sizeof(snbuf), sbase, val); 876 for (q = snbuf ; *q ; q++) { 877 *bp++ = *q; 878 left--; 879 } 880 881 /* 882 * If the value we printed was 0 and we're using the old-style format, 883 * or if we don't have room for "<x>", we're done. 884 */ 885 if (((val == 0) && (ch != '\177')) || left < 3) 886 return (bf); 887 888 #define PUTBYTE(b, c, l) do { \ 889 *(b)++ = (c); \ 890 if (--(l) == 0) \ 891 goto out; \ 892 } while (/*CONSTCOND*/ 0) 893 #define PUTSTR(b, p, l) do { \ 894 int c; \ 895 while ((c = *(p)++) != 0) { \ 896 *(b)++ = c; \ 897 if (--(l) == 0) \ 898 goto out; \ 899 } \ 900 } while (/*CONSTCOND*/ 0) 901 902 /* 903 * Chris Torek's new bitmask format is identified by a leading \177 904 */ 905 sep = '<'; 906 if (ch != '\177') { 907 /* old (standard) format. */ 908 for (;(bit = *p++) != 0;) { 909 if (val & (1 << (bit - 1))) { 910 PUTBYTE(bp, sep, left); 911 for (; (ch = *p) > ' '; ++p) { 912 PUTBYTE(bp, ch, left); 913 } 914 sep = ','; 915 } else 916 for (; *p > ' '; ++p) 917 continue; 918 } 919 } else { 920 /* new quad-capable format; also does fields. */ 921 field = val; 922 while ((ch = *p++) != '\0') { 923 bit = *p++; /* now 0-origin */ 924 switch (ch) { 925 case 'b': 926 if (((u_int)(val >> bit) & 1) == 0) 927 goto skip; 928 PUTBYTE(bp, sep, left); 929 PUTSTR(bp, p, left); 930 sep = ','; 931 break; 932 case 'f': 933 case 'F': 934 len = *p++; /* field length */ 935 field = (val >> bit) & ((1ULL << len) - 1); 936 if (ch == 'F') /* just extract */ 937 break; 938 PUTBYTE(bp, sep, left); 939 sep = ','; 940 PUTSTR(bp, p, left); 941 PUTBYTE(bp, '=', left); 942 sprintf(snbuf, sbase, field); 943 q = snbuf; PUTSTR(bp, q, left); 944 break; 945 case '=': 946 case ':': 947 /* 948 * Here "bit" is actually a value instead, 949 * to be compared against the last field. 950 * This only works for values in [0..255], 951 * of course. 952 */ 953 if ((int)field != bit) 954 goto skip; 955 if (ch == '=') 956 PUTBYTE(bp, '=', left); 957 PUTSTR(bp, p, left); 958 break; 959 default: 960 skip: 961 while (*p++ != '\0') 962 continue; 963 break; 964 } 965 } 966 } 967 if (sep != '<') 968 PUTBYTE(bp, '>', left); 969 970 out: 971 return (bf); 972 973 #undef PUTBYTE 974 #undef PUTSTR 975 } 976 977 /* 978 * kprintf: scaled down version of printf(3). 979 * 980 * this version based on vfprintf() from libc which was derived from 981 * software contributed to Berkeley by Chris Torek. 982 * 983 * NOTE: The kprintf mutex must be held if we're going TOBUF or TOCONS! 984 */ 985 986 /* 987 * macros for converting digits to letters and vice versa 988 */ 989 #define to_digit(c) ((c) - '') 990 #define is_digit(c) ((unsigned)to_digit(c) <= 9) 991 #define to_char(n) ((n) + '') 992 993 /* 994 * flags used during conversion. 995 */ 996 #define ALT 0x001 /* alternate form */ 997 #define HEXPREFIX 0x002 /* add 0x or 0X prefix */ 998 #define LADJUST 0x004 /* left adjustment */ 999 #define LONGDBL 0x008 /* long double; unimplemented */ 1000 #define LONGINT 0x010 /* long integer */ 1001 #define QUADINT 0x020 /* quad integer */ 1002 #define SHORTINT 0x040 /* short integer */ 1003 #define MAXINT 0x080 /* intmax_t */ 1004 #define PTRINT 0x100 /* intptr_t */ 1005 #define SIZEINT 0x200 /* size_t */ 1006 #define ZEROPAD 0x400 /* zero (as opposed to blank) pad */ 1007 #define FPT 0x800 /* Floating point number */ 1008 1009 /* 1010 * To extend shorts properly, we need both signed and unsigned 1011 * argument extraction methods. 1012 */ 1013 #define SARG() \ 1014 (flags&MAXINT ? va_arg(ap, intmax_t) : \ 1015 flags&PTRINT ? va_arg(ap, intptr_t) : \ 1016 flags&SIZEINT ? va_arg(ap, ssize_t) : /* XXX */ \ 1017 flags&QUADINT ? va_arg(ap, quad_t) : \ 1018 flags&LONGINT ? va_arg(ap, long) : \ 1019 flags&SHORTINT ? (long)(short)va_arg(ap, int) : \ 1020 (long)va_arg(ap, int)) 1021 #define UARG() \ 1022 (flags&MAXINT ? va_arg(ap, uintmax_t) : \ 1023 flags&PTRINT ? va_arg(ap, uintptr_t) : \ 1024 flags&SIZEINT ? va_arg(ap, size_t) : \ 1025 flags&QUADINT ? va_arg(ap, u_quad_t) : \ 1026 flags&LONGINT ? va_arg(ap, u_long) : \ 1027 flags&SHORTINT ? (u_long)(u_short)va_arg(ap, int) : \ 1028 (u_long)va_arg(ap, u_int)) 1029 1030 #define KPRINTF_PUTCHAR(C) { \ 1031 if (oflags == TOBUFONLY) { \ 1032 if ((vp != NULL) && (sbuf == tailp)) { \ 1033 ret += 1; /* indicate error */ \ 1034 goto overflow; \ 1035 } \ 1036 *sbuf++ = (C); \ 1037 } else { \ 1038 putchar((C), oflags, (struct tty *)vp); \ 1039 } \ 1040 } 1041 1042 /* 1043 * Guts of kernel printf. Note, we already expect to be in a mutex! 1044 */ 1045 int 1046 kprintf(const char *fmt0, int oflags, void *vp, char *sbuf, va_list ap) 1047 { 1048 const char *fmt; /* format string */ 1049 int ch; /* character from fmt */ 1050 int n; /* handy integer (short term usage) */ 1051 char *cp; /* handy char pointer (short term usage) */ 1052 int flags; /* flags as above */ 1053 int ret; /* return value accumulator */ 1054 int width; /* width from format (%8d), or 0 */ 1055 int prec; /* precision from format (%.3d), or -1 */ 1056 char sign; /* sign prefix (' ', '+', '-', or \0) */ 1057 1058 u_quad_t _uquad; /* integer arguments %[diouxX] */ 1059 enum { OCT, DEC, HEX } base;/* base for [diouxX] conversion */ 1060 int dprec; /* a copy of prec if [diouxX], 0 otherwise */ 1061 int realsz; /* field size expanded by dprec */ 1062 int size; /* size of converted field or string */ 1063 const char *xdigs; /* digits for [xX] conversion */ 1064 char bf[KPRINTF_BUFSIZE]; /* space for %c, %[diouxX] */ 1065 char *tailp; /* tail pointer for snprintf */ 1066 1067 tailp = NULL; /* XXX: shutup gcc */ 1068 if (oflags == TOBUFONLY && (vp != NULL)) 1069 tailp = *(char **)vp; 1070 1071 cp = NULL; /* XXX: shutup gcc */ 1072 size = 0; /* XXX: shutup gcc */ 1073 1074 fmt = fmt0; 1075 ret = 0; 1076 1077 xdigs = NULL; /* XXX: shut up gcc warning */ 1078 1079 /* 1080 * Scan the format for conversions (`%' character). 1081 */ 1082 for (;;) { 1083 while (*fmt != '%' && *fmt) { 1084 ret++; 1085 KPRINTF_PUTCHAR(*fmt++); 1086 } 1087 if (*fmt == 0) 1088 goto done; 1089 1090 fmt++; /* skip over '%' */ 1091 1092 flags = 0; 1093 dprec = 0; 1094 width = 0; 1095 prec = -1; 1096 sign = '\0'; 1097 1098 rflag: ch = *fmt++; 1099 reswitch: switch (ch) { 1100 case ' ': 1101 /* 1102 * ``If the space and + flags both appear, the space 1103 * flag will be ignored.'' 1104 * -- ANSI X3J11 1105 */ 1106 if (!sign) 1107 sign = ' '; 1108 goto rflag; 1109 case '#': 1110 flags |= ALT; 1111 goto rflag; 1112 case '*': 1113 /* 1114 * ``A negative field width argument is taken as a 1115 * - flag followed by a positive field width.'' 1116 * -- ANSI X3J11 1117 * They don't exclude field widths read from args. 1118 */ 1119 if ((width = va_arg(ap, int)) >= 0) 1120 goto rflag; 1121 width = -width; 1122 /* FALLTHROUGH */ 1123 case '-': 1124 flags |= LADJUST; 1125 goto rflag; 1126 case '+': 1127 sign = '+'; 1128 goto rflag; 1129 case '.': 1130 if ((ch = *fmt++) == '*') { 1131 n = va_arg(ap, int); 1132 prec = n < 0 ? -1 : n; 1133 goto rflag; 1134 } 1135 n = 0; 1136 while (is_digit(ch)) { 1137 n = 10 * n + to_digit(ch); 1138 ch = *fmt++; 1139 } 1140 prec = n < 0 ? -1 : n; 1141 goto reswitch; 1142 case '': 1143 /* 1144 * ``Note that 0 is taken as a flag, not as the 1145 * beginning of a field width.'' 1146 * -- ANSI X3J11 1147 */ 1148 flags |= ZEROPAD; 1149 goto rflag; 1150 case '1': case '2': case '3': case '4': 1151 case '5': case '6': case '7': case '8': case '9': 1152 n = 0; 1153 do { 1154 n = 10 * n + to_digit(ch); 1155 ch = *fmt++; 1156 } while (is_digit(ch)); 1157 width = n; 1158 goto reswitch; 1159 case 'h': 1160 flags |= SHORTINT; 1161 goto rflag; 1162 case 'j': 1163 flags |= MAXINT; 1164 goto rflag; 1165 case 'l': 1166 if (*fmt == 'l') { 1167 fmt++; 1168 flags |= QUADINT; 1169 } else { 1170 flags |= LONGINT; 1171 } 1172 goto rflag; 1173 case 'q': 1174 flags |= QUADINT; 1175 goto rflag; 1176 case 't': 1177 flags |= PTRINT; 1178 goto rflag; 1179 case 'z': 1180 flags |= SIZEINT; 1181 goto rflag; 1182 case 'c': 1183 *(cp = bf) = va_arg(ap, int); 1184 size = 1; 1185 sign = '\0'; 1186 break; 1187 case 'D': 1188 flags |= LONGINT; 1189 /*FALLTHROUGH*/ 1190 case 'd': 1191 case 'i': 1192 _uquad = SARG(); 1193 if ((quad_t)_uquad < 0) { 1194 _uquad = -_uquad; 1195 sign = '-'; 1196 } 1197 base = DEC; 1198 goto number; 1199 case 'n': 1200 if (flags & MAXINT) 1201 *va_arg(ap, intmax_t *) = ret; 1202 else if (flags & PTRINT) 1203 *va_arg(ap, intptr_t *) = ret; 1204 else if (flags & SIZEINT) 1205 *va_arg(ap, ssize_t *) = ret; 1206 else if (flags & QUADINT) 1207 *va_arg(ap, quad_t *) = ret; 1208 else if (flags & LONGINT) 1209 *va_arg(ap, long *) = ret; 1210 else if (flags & SHORTINT) 1211 *va_arg(ap, short *) = ret; 1212 else 1213 *va_arg(ap, int *) = ret; 1214 continue; /* no output */ 1215 case 'O': 1216 flags |= LONGINT; 1217 /*FALLTHROUGH*/ 1218 case 'o': 1219 _uquad = UARG(); 1220 base = OCT; 1221 goto nosign; 1222 case 'p': 1223 /* 1224 * ``The argument shall be a pointer to void. The 1225 * value of the pointer is converted to a sequence 1226 * of printable characters, in an implementation- 1227 * defined manner.'' 1228 * -- ANSI X3J11 1229 */ 1230 /* NOSTRICT */ 1231 _uquad = (u_long)va_arg(ap, void *); 1232 base = HEX; 1233 xdigs = hexdigits; 1234 flags |= HEXPREFIX; 1235 ch = 'x'; 1236 goto nosign; 1237 case 's': 1238 if ((cp = va_arg(ap, char *)) == NULL) 1239 /*XXXUNCONST*/ 1240 cp = __UNCONST("(null)"); 1241 if (prec >= 0) { 1242 /* 1243 * can't use strlen; can only look for the 1244 * NUL in the first `prec' characters, and 1245 * strlen() will go further. 1246 */ 1247 char *p = memchr(cp, 0, prec); 1248 1249 if (p != NULL) { 1250 size = p - cp; 1251 if (size > prec) 1252 size = prec; 1253 } else 1254 size = prec; 1255 } else 1256 size = strlen(cp); 1257 sign = '\0'; 1258 break; 1259 case 'U': 1260 flags |= LONGINT; 1261 /*FALLTHROUGH*/ 1262 case 'u': 1263 _uquad = UARG(); 1264 base = DEC; 1265 goto nosign; 1266 case 'X': 1267 xdigs = HEXDIGITS; 1268 goto hex; 1269 case 'x': 1270 xdigs = hexdigits; 1271 hex: _uquad = UARG(); 1272 base = HEX; 1273 /* leading 0x/X only if non-zero */ 1274 if (flags & ALT && _uquad != 0) 1275 flags |= HEXPREFIX; 1276 1277 /* unsigned conversions */ 1278 nosign: sign = '\0'; 1279 /* 1280 * ``... diouXx conversions ... if a precision is 1281 * specified, the 0 flag will be ignored.'' 1282 * -- ANSI X3J11 1283 */ 1284 number: if ((dprec = prec) >= 0) 1285 flags &= ~ZEROPAD; 1286 1287 /* 1288 * ``The result of converting a zero value with an 1289 * explicit precision of zero is no characters.'' 1290 * -- ANSI X3J11 1291 */ 1292 cp = bf + KPRINTF_BUFSIZE; 1293 if (_uquad != 0 || prec != 0) { 1294 /* 1295 * Unsigned mod is hard, and unsigned mod 1296 * by a constant is easier than that by 1297 * a variable; hence this switch. 1298 */ 1299 switch (base) { 1300 case OCT: 1301 do { 1302 *--cp = to_char(_uquad & 7); 1303 _uquad >>= 3; 1304 } while (_uquad); 1305 /* handle octal leading 0 */ 1306 if (flags & ALT && *cp != '') 1307 *--cp = ''; 1308 break; 1309 1310 case DEC: 1311 /* many numbers are 1 digit */ 1312 while (_uquad >= 10) { 1313 *--cp = to_char(_uquad % 10); 1314 _uquad /= 10; 1315 } 1316 *--cp = to_char(_uquad); 1317 break; 1318 1319 case HEX: 1320 do { 1321 *--cp = xdigs[_uquad & 15]; 1322 _uquad >>= 4; 1323 } while (_uquad); 1324 break; 1325 1326 default: 1327 /*XXXUNCONST*/ 1328 cp = __UNCONST("bug in kprintf: bad base"); 1329 size = strlen(cp); 1330 goto skipsize; 1331 } 1332 } 1333 size = bf + KPRINTF_BUFSIZE - cp; 1334 skipsize: 1335 break; 1336 default: /* "%?" prints ?, unless ? is NUL */ 1337 if (ch == '\0') 1338 goto done; 1339 /* pretend it was %c with argument ch */ 1340 cp = bf; 1341 *cp = ch; 1342 size = 1; 1343 sign = '\0'; 1344 break; 1345 } 1346 1347 /* 1348 * All reasonable formats wind up here. At this point, `cp' 1349 * points to a string which (if not flags&LADJUST) should be 1350 * padded out to `width' places. If flags&ZEROPAD, it should 1351 * first be prefixed by any sign or other prefix; otherwise, 1352 * it should be blank padded before the prefix is emitted. 1353 * After any left-hand padding and prefixing, emit zeroes 1354 * required by a decimal [diouxX] precision, then print the 1355 * string proper, then emit zeroes required by any leftover 1356 * floating precision; finally, if LADJUST, pad with blanks. 1357 * 1358 * Compute actual size, so we know how much to pad. 1359 * size excludes decimal prec; realsz includes it. 1360 */ 1361 realsz = dprec > size ? dprec : size; 1362 if (sign) 1363 realsz++; 1364 else if (flags & HEXPREFIX) 1365 realsz+= 2; 1366 1367 /* adjust ret */ 1368 ret += width > realsz ? width : realsz; 1369 1370 /* right-adjusting blank padding */ 1371 if ((flags & (LADJUST|ZEROPAD)) == 0) { 1372 n = width - realsz; 1373 while (n-- > 0) 1374 KPRINTF_PUTCHAR(' '); 1375 } 1376 1377 /* prefix */ 1378 if (sign) { 1379 KPRINTF_PUTCHAR(sign); 1380 } else if (flags & HEXPREFIX) { 1381 KPRINTF_PUTCHAR(''); 1382 KPRINTF_PUTCHAR(ch); 1383 } 1384 1385 /* right-adjusting zero padding */ 1386 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) { 1387 n = width - realsz; 1388 while (n-- > 0) 1389 KPRINTF_PUTCHAR(''); 1390 } 1391 1392 /* leading zeroes from decimal precision */ 1393 n = dprec - size; 1394 while (n-- > 0) 1395 KPRINTF_PUTCHAR(''); 1396 1397 /* the string or number proper */ 1398 while (size--) 1399 KPRINTF_PUTCHAR(*cp++); 1400 /* left-adjusting padding (always blank) */ 1401 if (flags & LADJUST) { 1402 n = width - realsz; 1403 while (n-- > 0) 1404 KPRINTF_PUTCHAR(' '); 1405 } 1406 } 1407 1408 done: 1409 if ((oflags == TOBUFONLY) && (vp != NULL)) 1410 *(char **)vp = sbuf; 1411 (*v_flush)(); 1412 overflow: 1413 return (ret); 1414 /* NOTREACHED */ 1415 }
Cache object: 7af0afcfb4f1ebed300d969e0e313706
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