subr_prf.c revision 1.103.2.3
1 /* $NetBSD: subr_prf.c,v 1.103.2.3 2007/01/20 00:19:01 ad 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 1.103.2.3 2007/01/20 00:19:01 ad 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 /* mutex_enter(&proclist_mutex); XXXSMP */ 432 433 if (p->p_lflag & PL_CONTROLT && p->p_session->s_ttyvp) { 434 /* No mutex needed; going to process TTY. */ 435 va_start(ap, fmt); 436 kprintf(fmt, TOTTY, p->p_session->s_ttyp, NULL, ap); 437 va_end(ap); 438 } 439 440 /* mutex_exit(&proclist_mutex); XXXSMP */ 441 } 442 443 void 444 uprintf_locked(const char *fmt, ...) 445 { 446 struct proc *p = curproc; 447 va_list ap; 448 449 if (p->p_lflag & PL_CONTROLT && p->p_session->s_ttyvp) { 450 /* No mutex needed; going to process TTY. */ 451 va_start(ap, fmt); 452 kprintf(fmt, TOTTY, p->p_session->s_ttyp, NULL, ap); 453 va_end(ap); 454 } 455 } 456 457 /* 458 * tprintf functions: used to send messages to a specific process 459 * 460 * usage: 461 * get a tpr_t handle on a process "p" by using "tprintf_open(p)" 462 * use the handle when calling "tprintf" 463 * when done, do a "tprintf_close" to drop the handle 464 */ 465 466 /* 467 * tprintf_open: get a tprintf handle on a process "p" 468 * 469 * => returns NULL if process can't be printed to 470 */ 471 472 tpr_t 473 tprintf_open(struct proc *p) 474 { 475 tpr_t cookie; 476 477 cookie = NULL; 478 479 /* mutex_enter(&proclist_mutex); XXXSMP */ 480 if (p->p_lflag & PL_CONTROLT && p->p_session->s_ttyvp) { 481 SESSHOLD(p->p_session); 482 cookie = (tpr_t)p->p_session; 483 } 484 /* mutex_exit(&proclist_mutex) XXXSMP */ 485 486 return cookie; 487 } 488 489 /* 490 * tprintf_close: dispose of a tprintf handle obtained with tprintf_open 491 */ 492 493 void 494 tprintf_close(tpr_t sess) 495 { 496 497 if (sess) 498 SESSRELE((struct session *) sess); 499 } 500 501 /* 502 * tprintf: given tprintf handle to a process [obtained with tprintf_open], 503 * send a message to the controlling tty for that process. 504 * 505 * => also sends message to /dev/klog 506 */ 507 void 508 tprintf(tpr_t tpr, const char *fmt, ...) 509 { 510 struct session *sess = (struct session *)tpr; 511 struct tty *tp = NULL; 512 int s, flags = TOLOG; 513 va_list ap; 514 515 /* mutex_enter(&proclist_mutex); XXXSMP */ 516 if (sess && sess->s_ttyvp && ttycheckoutq(sess->s_ttyp, 0)) { 517 flags |= TOTTY; 518 tp = sess->s_ttyp; 519 } 520 521 KPRINTF_MUTEX_ENTER(s); 522 523 klogpri(LOG_INFO); 524 va_start(ap, fmt); 525 kprintf(fmt, flags, tp, NULL, ap); 526 va_end(ap); 527 528 KPRINTF_MUTEX_EXIT(s); 529 /* mutex_exit(&proclist_mutex); XXXSMP */ 530 531 logwakeup(); 532 } 533 534 535 /* 536 * ttyprintf: send a message to a specific tty 537 * 538 * => should be used only by tty driver or anything that knows the 539 * underlying tty will not be revoked(2)'d away. [otherwise, 540 * use tprintf] 541 */ 542 void 543 ttyprintf(struct tty *tp, const char *fmt, ...) 544 { 545 va_list ap; 546 547 /* No mutex needed; going to process TTY. */ 548 va_start(ap, fmt); 549 kprintf(fmt, TOTTY, tp, NULL, ap); 550 va_end(ap); 551 } 552 553 #ifdef DDB 554 555 /* 556 * db_printf: printf for DDB (via db_putchar) 557 */ 558 559 void 560 db_printf(const char *fmt, ...) 561 { 562 va_list ap; 563 564 /* No mutex needed; DDB pauses all processors. */ 565 va_start(ap, fmt); 566 kprintf(fmt, TODDB, NULL, NULL, ap); 567 va_end(ap); 568 569 if (db_tee_msgbuf) { 570 va_start(ap, fmt); 571 kprintf(fmt, TOLOG, NULL, NULL, ap); 572 va_end(ap); 573 }; 574 } 575 576 void 577 db_vprintf(const char *fmt, va_list ap) 578 { 579 580 /* No mutex needed; DDB pauses all processors. */ 581 kprintf(fmt, TODDB, NULL, NULL, ap); 582 if (db_tee_msgbuf) 583 kprintf(fmt, TOLOG, NULL, NULL, ap); 584 } 585 586 #endif /* DDB */ 587 588 /* 589 * Device autoconfiguration printf routines. These change their 590 * behavior based on the AB_* flags in boothowto. If AB_SILENT 591 * is set, messages never go to the console (but they still always 592 * go to the log). AB_VERBOSE overrides AB_SILENT. 593 */ 594 595 /* 596 * aprint_normal: Send to console unless AB_QUIET. Always goes 597 * to the log. 598 */ 599 void 600 aprint_normal(const char *fmt, ...) 601 { 602 va_list ap; 603 int s, flags = TOLOG; 604 605 if ((boothowto & (AB_SILENT|AB_QUIET)) == 0 || 606 (boothowto & AB_VERBOSE) != 0) 607 flags |= TOCONS; 608 609 KPRINTF_MUTEX_ENTER(s); 610 611 va_start(ap, fmt); 612 kprintf(fmt, flags, NULL, NULL, ap); 613 va_end(ap); 614 615 KPRINTF_MUTEX_EXIT(s); 616 617 if (!panicstr) 618 logwakeup(); 619 } 620 621 /* 622 * aprint_error: Send to console unless AB_QUIET. Always goes 623 * to the log. Also counts the number of times called so other 624 * parts of the kernel can report the number of errors during a 625 * given phase of system startup. 626 */ 627 static int aprint_error_count; 628 629 int 630 aprint_get_error_count(void) 631 { 632 int count, s; 633 634 KPRINTF_MUTEX_ENTER(s); 635 636 count = aprint_error_count; 637 aprint_error_count = 0; 638 639 KPRINTF_MUTEX_EXIT(s); 640 641 return (count); 642 } 643 644 void 645 aprint_error(const char *fmt, ...) 646 { 647 va_list ap; 648 int s, flags = TOLOG; 649 650 if ((boothowto & (AB_SILENT|AB_QUIET)) == 0 || 651 (boothowto & AB_VERBOSE) != 0) 652 flags |= TOCONS; 653 654 KPRINTF_MUTEX_ENTER(s); 655 656 aprint_error_count++; 657 658 va_start(ap, fmt); 659 kprintf(fmt, flags, NULL, NULL, ap); 660 va_end(ap); 661 662 KPRINTF_MUTEX_EXIT(s); 663 664 if (!panicstr) 665 logwakeup(); 666 } 667 668 /* 669 * aprint_naive: Send to console only if AB_QUIET. Never goes 670 * to the log. 671 */ 672 void 673 aprint_naive(const char *fmt, ...) 674 { 675 va_list ap; 676 int s; 677 678 if ((boothowto & (AB_QUIET|AB_SILENT|AB_VERBOSE)) == AB_QUIET) { 679 KPRINTF_MUTEX_ENTER(s); 680 681 va_start(ap, fmt); 682 kprintf(fmt, TOCONS, NULL, NULL, ap); 683 va_end(ap); 684 685 KPRINTF_MUTEX_EXIT(s); 686 } 687 } 688 689 /* 690 * aprint_verbose: Send to console only if AB_VERBOSE. Always 691 * goes to the log. 692 */ 693 void 694 aprint_verbose(const char *fmt, ...) 695 { 696 va_list ap; 697 int s, flags = TOLOG; 698 699 if (boothowto & AB_VERBOSE) 700 flags |= TOCONS; 701 702 KPRINTF_MUTEX_ENTER(s); 703 704 va_start(ap, fmt); 705 kprintf(fmt, flags, NULL, NULL, ap); 706 va_end(ap); 707 708 KPRINTF_MUTEX_EXIT(s); 709 710 if (!panicstr) 711 logwakeup(); 712 } 713 714 /* 715 * aprint_debug: Send to console and log only if AB_DEBUG. 716 */ 717 void 718 aprint_debug(const char *fmt, ...) 719 { 720 va_list ap; 721 int s; 722 723 if (boothowto & AB_DEBUG) { 724 KPRINTF_MUTEX_ENTER(s); 725 726 va_start(ap, fmt); 727 kprintf(fmt, TOCONS | TOLOG, NULL, NULL, ap); 728 va_end(ap); 729 730 KPRINTF_MUTEX_EXIT(s); 731 } 732 } 733 734 /* 735 * printf_nolog: Like printf(), but does not send message to the log. 736 */ 737 738 void 739 printf_nolog(const char *fmt, ...) 740 { 741 va_list ap; 742 int s; 743 744 KPRINTF_MUTEX_ENTER(s); 745 746 va_start(ap, fmt); 747 kprintf(fmt, TOCONS, NULL, NULL, ap); 748 va_end(ap); 749 750 KPRINTF_MUTEX_EXIT(s); 751 } 752 753 /* 754 * normal kernel printf functions: printf, vprintf, snprintf, vsnprintf 755 */ 756 757 /* 758 * printf: print a message to the console and the log 759 */ 760 void 761 printf(const char *fmt, ...) 762 { 763 va_list ap; 764 int s; 765 766 KPRINTF_MUTEX_ENTER(s); 767 768 va_start(ap, fmt); 769 kprintf(fmt, TOCONS | TOLOG, NULL, NULL, ap); 770 va_end(ap); 771 772 KPRINTF_MUTEX_EXIT(s); 773 774 if (!panicstr) 775 logwakeup(); 776 } 777 778 /* 779 * vprintf: print a message to the console and the log [already have 780 * va_alist] 781 */ 782 783 void 784 vprintf(const char *fmt, va_list ap) 785 { 786 int s; 787 788 KPRINTF_MUTEX_ENTER(s); 789 790 kprintf(fmt, TOCONS | TOLOG, NULL, NULL, ap); 791 792 KPRINTF_MUTEX_EXIT(s); 793 794 if (!panicstr) 795 logwakeup(); 796 } 797 798 /* 799 * sprintf: print a message to a buffer 800 */ 801 int 802 sprintf(char *bf, const char *fmt, ...) 803 { 804 int retval; 805 va_list ap; 806 807 va_start(ap, fmt); 808 retval = kprintf(fmt, TOBUFONLY, NULL, bf, ap); 809 va_end(ap); 810 *(bf + retval) = 0; /* null terminate */ 811 return(retval); 812 } 813 814 /* 815 * vsprintf: print a message to a buffer [already have va_alist] 816 */ 817 818 int 819 vsprintf(char *bf, const char *fmt, va_list ap) 820 { 821 int retval; 822 823 retval = kprintf(fmt, TOBUFONLY, NULL, bf, ap); 824 *(bf + retval) = 0; /* null terminate */ 825 return (retval); 826 } 827 828 /* 829 * snprintf: print a message to a buffer 830 */ 831 int 832 snprintf(char *bf, size_t size, const char *fmt, ...) 833 { 834 int retval; 835 va_list ap; 836 char *p; 837 838 if (size < 1) 839 return (-1); 840 p = bf + size - 1; 841 va_start(ap, fmt); 842 retval = kprintf(fmt, TOBUFONLY, &p, bf, ap); 843 va_end(ap); 844 *(p) = 0; /* null terminate */ 845 return(retval); 846 } 847 848 /* 849 * vsnprintf: print a message to a buffer [already have va_alist] 850 */ 851 int 852 vsnprintf(char *bf, size_t size, const char *fmt, va_list ap) 853 { 854 int retval; 855 char *p; 856 857 if (size < 1) 858 return (-1); 859 p = bf + size - 1; 860 retval = kprintf(fmt, TOBUFONLY, &p, bf, ap); 861 *(p) = 0; /* null terminate */ 862 return(retval); 863 } 864 865 /* 866 * bitmask_snprintf: print an interpreted bitmask to a buffer 867 * 868 * => returns pointer to the buffer 869 */ 870 char * 871 bitmask_snprintf(u_quad_t val, const char *p, char *bf, size_t buflen) 872 { 873 char *bp, *q; 874 size_t left; 875 const char *sbase; 876 char snbuf[KPRINTF_BUFSIZE]; 877 int base, bit, ch, len, sep; 878 u_quad_t field; 879 880 bp = bf; 881 memset(bf, 0, buflen); 882 883 /* 884 * Always leave room for the trailing NULL. 885 */ 886 left = buflen - 1; 887 888 /* 889 * Print the value into the buffer. Abort if there's not 890 * enough room. 891 */ 892 if (buflen < KPRINTF_BUFSIZE) 893 return (bf); 894 895 ch = *p++; 896 base = ch != '\177' ? ch : *p++; 897 sbase = base == 8 ? "%qo" : base == 10 ? "%qd" : base == 16 ? "%qx" : 0; 898 if (sbase == 0) 899 return (bf); /* punt if not oct, dec, or hex */ 900 901 snprintf(snbuf, sizeof(snbuf), sbase, val); 902 for (q = snbuf ; *q ; q++) { 903 *bp++ = *q; 904 left--; 905 } 906 907 /* 908 * If the value we printed was 0 and we're using the old-style format, 909 * or if we don't have room for "<x>", we're done. 910 */ 911 if (((val == 0) && (ch != '\177')) || left < 3) 912 return (bf); 913 914 #define PUTBYTE(b, c, l) do { \ 915 *(b)++ = (c); \ 916 if (--(l) == 0) \ 917 goto out; \ 918 } while (/*CONSTCOND*/ 0) 919 #define PUTSTR(b, p, l) do { \ 920 int c; \ 921 while ((c = *(p)++) != 0) { \ 922 *(b)++ = c; \ 923 if (--(l) == 0) \ 924 goto out; \ 925 } \ 926 } while (/*CONSTCOND*/ 0) 927 928 /* 929 * Chris Torek's new bitmask format is identified by a leading \177 930 */ 931 sep = '<'; 932 if (ch != '\177') { 933 /* old (standard) format. */ 934 for (;(bit = *p++) != 0;) { 935 if (val & (1 << (bit - 1))) { 936 PUTBYTE(bp, sep, left); 937 for (; (ch = *p) > ' '; ++p) { 938 PUTBYTE(bp, ch, left); 939 } 940 sep = ','; 941 } else 942 for (; *p > ' '; ++p) 943 continue; 944 } 945 } else { 946 /* new quad-capable format; also does fields. */ 947 field = val; 948 while ((ch = *p++) != '\0') { 949 bit = *p++; /* now 0-origin */ 950 switch (ch) { 951 case 'b': 952 if (((u_int)(val >> bit) & 1) == 0) 953 goto skip; 954 PUTBYTE(bp, sep, left); 955 PUTSTR(bp, p, left); 956 sep = ','; 957 break; 958 case 'f': 959 case 'F': 960 len = *p++; /* field length */ 961 field = (val >> bit) & ((1ULL << len) - 1); 962 if (ch == 'F') /* just extract */ 963 break; 964 PUTBYTE(bp, sep, left); 965 sep = ','; 966 PUTSTR(bp, p, left); 967 PUTBYTE(bp, '=', left); 968 sprintf(snbuf, sbase, field); 969 q = snbuf; PUTSTR(bp, q, left); 970 break; 971 case '=': 972 case ':': 973 /* 974 * Here "bit" is actually a value instead, 975 * to be compared against the last field. 976 * This only works for values in [0..255], 977 * of course. 978 */ 979 if ((int)field != bit) 980 goto skip; 981 if (ch == '=') 982 PUTBYTE(bp, '=', left); 983 PUTSTR(bp, p, left); 984 break; 985 default: 986 skip: 987 while (*p++ != '\0') 988 continue; 989 break; 990 } 991 } 992 } 993 if (sep != '<') 994 PUTBYTE(bp, '>', left); 995 996 out: 997 return (bf); 998 999 #undef PUTBYTE 1000 #undef PUTSTR 1001 } 1002 1003 /* 1004 * kprintf: scaled down version of printf(3). 1005 * 1006 * this version based on vfprintf() from libc which was derived from 1007 * software contributed to Berkeley by Chris Torek. 1008 * 1009 * NOTE: The kprintf mutex must be held if we're going TOBUF or TOCONS! 1010 */ 1011 1012 /* 1013 * macros for converting digits to letters and vice versa 1014 */ 1015 #define to_digit(c) ((c) - '0') 1016 #define is_digit(c) ((unsigned)to_digit(c) <= 9) 1017 #define to_char(n) ((n) + '0') 1018 1019 /* 1020 * flags used during conversion. 1021 */ 1022 #define ALT 0x001 /* alternate form */ 1023 #define HEXPREFIX 0x002 /* add 0x or 0X prefix */ 1024 #define LADJUST 0x004 /* left adjustment */ 1025 #define LONGDBL 0x008 /* long double; unimplemented */ 1026 #define LONGINT 0x010 /* long integer */ 1027 #define QUADINT 0x020 /* quad integer */ 1028 #define SHORTINT 0x040 /* short integer */ 1029 #define MAXINT 0x080 /* intmax_t */ 1030 #define PTRINT 0x100 /* intptr_t */ 1031 #define SIZEINT 0x200 /* size_t */ 1032 #define ZEROPAD 0x400 /* zero (as opposed to blank) pad */ 1033 #define FPT 0x800 /* Floating point number */ 1034 1035 /* 1036 * To extend shorts properly, we need both signed and unsigned 1037 * argument extraction methods. 1038 */ 1039 #define SARG() \ 1040 (flags&MAXINT ? va_arg(ap, intmax_t) : \ 1041 flags&PTRINT ? va_arg(ap, intptr_t) : \ 1042 flags&SIZEINT ? va_arg(ap, ssize_t) : /* XXX */ \ 1043 flags&QUADINT ? va_arg(ap, quad_t) : \ 1044 flags&LONGINT ? va_arg(ap, long) : \ 1045 flags&SHORTINT ? (long)(short)va_arg(ap, int) : \ 1046 (long)va_arg(ap, int)) 1047 #define UARG() \ 1048 (flags&MAXINT ? va_arg(ap, uintmax_t) : \ 1049 flags&PTRINT ? va_arg(ap, uintptr_t) : \ 1050 flags&SIZEINT ? va_arg(ap, size_t) : \ 1051 flags&QUADINT ? va_arg(ap, u_quad_t) : \ 1052 flags&LONGINT ? va_arg(ap, u_long) : \ 1053 flags&SHORTINT ? (u_long)(u_short)va_arg(ap, int) : \ 1054 (u_long)va_arg(ap, u_int)) 1055 1056 #define KPRINTF_PUTCHAR(C) { \ 1057 if (oflags == TOBUFONLY) { \ 1058 if ((vp != NULL) && (sbuf == tailp)) { \ 1059 ret += 1; /* indicate error */ \ 1060 goto overflow; \ 1061 } \ 1062 *sbuf++ = (C); \ 1063 } else { \ 1064 putchar((C), oflags, (struct tty *)vp); \ 1065 } \ 1066 } 1067 1068 /* 1069 * Guts of kernel printf. Note, we already expect to be in a mutex! 1070 */ 1071 int 1072 kprintf(const char *fmt0, int oflags, void *vp, char *sbuf, va_list ap) 1073 { 1074 const char *fmt; /* format string */ 1075 int ch; /* character from fmt */ 1076 int n; /* handy integer (short term usage) */ 1077 char *cp; /* handy char pointer (short term usage) */ 1078 int flags; /* flags as above */ 1079 int ret; /* return value accumulator */ 1080 int width; /* width from format (%8d), or 0 */ 1081 int prec; /* precision from format (%.3d), or -1 */ 1082 char sign; /* sign prefix (' ', '+', '-', or \0) */ 1083 1084 u_quad_t _uquad; /* integer arguments %[diouxX] */ 1085 enum { OCT, DEC, HEX } base;/* base for [diouxX] conversion */ 1086 int dprec; /* a copy of prec if [diouxX], 0 otherwise */ 1087 int realsz; /* field size expanded by dprec */ 1088 int size; /* size of converted field or string */ 1089 const char *xdigs; /* digits for [xX] conversion */ 1090 char bf[KPRINTF_BUFSIZE]; /* space for %c, %[diouxX] */ 1091 char *tailp; /* tail pointer for snprintf */ 1092 1093 tailp = NULL; /* XXX: shutup gcc */ 1094 if (oflags == TOBUFONLY && (vp != NULL)) 1095 tailp = *(char **)vp; 1096 1097 cp = NULL; /* XXX: shutup gcc */ 1098 size = 0; /* XXX: shutup gcc */ 1099 1100 fmt = fmt0; 1101 ret = 0; 1102 1103 xdigs = NULL; /* XXX: shut up gcc warning */ 1104 1105 /* 1106 * Scan the format for conversions (`%' character). 1107 */ 1108 for (;;) { 1109 while (*fmt != '%' && *fmt) { 1110 ret++; 1111 KPRINTF_PUTCHAR(*fmt++); 1112 } 1113 if (*fmt == 0) 1114 goto done; 1115 1116 fmt++; /* skip over '%' */ 1117 1118 flags = 0; 1119 dprec = 0; 1120 width = 0; 1121 prec = -1; 1122 sign = '\0'; 1123 1124 rflag: ch = *fmt++; 1125 reswitch: switch (ch) { 1126 case ' ': 1127 /* 1128 * ``If the space and + flags both appear, the space 1129 * flag will be ignored.'' 1130 * -- ANSI X3J11 1131 */ 1132 if (!sign) 1133 sign = ' '; 1134 goto rflag; 1135 case '#': 1136 flags |= ALT; 1137 goto rflag; 1138 case '*': 1139 /* 1140 * ``A negative field width argument is taken as a 1141 * - flag followed by a positive field width.'' 1142 * -- ANSI X3J11 1143 * They don't exclude field widths read from args. 1144 */ 1145 if ((width = va_arg(ap, int)) >= 0) 1146 goto rflag; 1147 width = -width; 1148 /* FALLTHROUGH */ 1149 case '-': 1150 flags |= LADJUST; 1151 goto rflag; 1152 case '+': 1153 sign = '+'; 1154 goto rflag; 1155 case '.': 1156 if ((ch = *fmt++) == '*') { 1157 n = va_arg(ap, int); 1158 prec = n < 0 ? -1 : n; 1159 goto rflag; 1160 } 1161 n = 0; 1162 while (is_digit(ch)) { 1163 n = 10 * n + to_digit(ch); 1164 ch = *fmt++; 1165 } 1166 prec = n < 0 ? -1 : n; 1167 goto reswitch; 1168 case '0': 1169 /* 1170 * ``Note that 0 is taken as a flag, not as the 1171 * beginning of a field width.'' 1172 * -- ANSI X3J11 1173 */ 1174 flags |= ZEROPAD; 1175 goto rflag; 1176 case '1': case '2': case '3': case '4': 1177 case '5': case '6': case '7': case '8': case '9': 1178 n = 0; 1179 do { 1180 n = 10 * n + to_digit(ch); 1181 ch = *fmt++; 1182 } while (is_digit(ch)); 1183 width = n; 1184 goto reswitch; 1185 case 'h': 1186 flags |= SHORTINT; 1187 goto rflag; 1188 case 'j': 1189 flags |= MAXINT; 1190 goto rflag; 1191 case 'l': 1192 if (*fmt == 'l') { 1193 fmt++; 1194 flags |= QUADINT; 1195 } else { 1196 flags |= LONGINT; 1197 } 1198 goto rflag; 1199 case 'q': 1200 flags |= QUADINT; 1201 goto rflag; 1202 case 't': 1203 flags |= PTRINT; 1204 goto rflag; 1205 case 'z': 1206 flags |= SIZEINT; 1207 goto rflag; 1208 case 'c': 1209 *(cp = bf) = va_arg(ap, int); 1210 size = 1; 1211 sign = '\0'; 1212 break; 1213 case 'D': 1214 flags |= LONGINT; 1215 /*FALLTHROUGH*/ 1216 case 'd': 1217 case 'i': 1218 _uquad = SARG(); 1219 if ((quad_t)_uquad < 0) { 1220 _uquad = -_uquad; 1221 sign = '-'; 1222 } 1223 base = DEC; 1224 goto number; 1225 case 'n': 1226 if (flags & MAXINT) 1227 *va_arg(ap, intmax_t *) = ret; 1228 else if (flags & PTRINT) 1229 *va_arg(ap, intptr_t *) = ret; 1230 else if (flags & SIZEINT) 1231 *va_arg(ap, ssize_t *) = ret; 1232 else if (flags & QUADINT) 1233 *va_arg(ap, quad_t *) = ret; 1234 else if (flags & LONGINT) 1235 *va_arg(ap, long *) = ret; 1236 else if (flags & SHORTINT) 1237 *va_arg(ap, short *) = ret; 1238 else 1239 *va_arg(ap, int *) = ret; 1240 continue; /* no output */ 1241 case 'O': 1242 flags |= LONGINT; 1243 /*FALLTHROUGH*/ 1244 case 'o': 1245 _uquad = UARG(); 1246 base = OCT; 1247 goto nosign; 1248 case 'p': 1249 /* 1250 * ``The argument shall be a pointer to void. The 1251 * value of the pointer is converted to a sequence 1252 * of printable characters, in an implementation- 1253 * defined manner.'' 1254 * -- ANSI X3J11 1255 */ 1256 /* NOSTRICT */ 1257 _uquad = (u_long)va_arg(ap, void *); 1258 base = HEX; 1259 xdigs = hexdigits; 1260 flags |= HEXPREFIX; 1261 ch = 'x'; 1262 goto nosign; 1263 case 's': 1264 if ((cp = va_arg(ap, char *)) == NULL) 1265 /*XXXUNCONST*/ 1266 cp = __UNCONST("(null)"); 1267 if (prec >= 0) { 1268 /* 1269 * can't use strlen; can only look for the 1270 * NUL in the first `prec' characters, and 1271 * strlen() will go further. 1272 */ 1273 char *p = memchr(cp, 0, prec); 1274 1275 if (p != NULL) { 1276 size = p - cp; 1277 if (size > prec) 1278 size = prec; 1279 } else 1280 size = prec; 1281 } else 1282 size = strlen(cp); 1283 sign = '\0'; 1284 break; 1285 case 'U': 1286 flags |= LONGINT; 1287 /*FALLTHROUGH*/ 1288 case 'u': 1289 _uquad = UARG(); 1290 base = DEC; 1291 goto nosign; 1292 case 'X': 1293 xdigs = HEXDIGITS; 1294 goto hex; 1295 case 'x': 1296 xdigs = hexdigits; 1297 hex: _uquad = UARG(); 1298 base = HEX; 1299 /* leading 0x/X only if non-zero */ 1300 if (flags & ALT && _uquad != 0) 1301 flags |= HEXPREFIX; 1302 1303 /* unsigned conversions */ 1304 nosign: sign = '\0'; 1305 /* 1306 * ``... diouXx conversions ... if a precision is 1307 * specified, the 0 flag will be ignored.'' 1308 * -- ANSI X3J11 1309 */ 1310 number: if ((dprec = prec) >= 0) 1311 flags &= ~ZEROPAD; 1312 1313 /* 1314 * ``The result of converting a zero value with an 1315 * explicit precision of zero is no characters.'' 1316 * -- ANSI X3J11 1317 */ 1318 cp = bf + KPRINTF_BUFSIZE; 1319 if (_uquad != 0 || prec != 0) { 1320 /* 1321 * Unsigned mod is hard, and unsigned mod 1322 * by a constant is easier than that by 1323 * a variable; hence this switch. 1324 */ 1325 switch (base) { 1326 case OCT: 1327 do { 1328 *--cp = to_char(_uquad & 7); 1329 _uquad >>= 3; 1330 } while (_uquad); 1331 /* handle octal leading 0 */ 1332 if (flags & ALT && *cp != '0') 1333 *--cp = '0'; 1334 break; 1335 1336 case DEC: 1337 /* many numbers are 1 digit */ 1338 while (_uquad >= 10) { 1339 *--cp = to_char(_uquad % 10); 1340 _uquad /= 10; 1341 } 1342 *--cp = to_char(_uquad); 1343 break; 1344 1345 case HEX: 1346 do { 1347 *--cp = xdigs[_uquad & 15]; 1348 _uquad >>= 4; 1349 } while (_uquad); 1350 break; 1351 1352 default: 1353 /*XXXUNCONST*/ 1354 cp = __UNCONST("bug in kprintf: bad base"); 1355 size = strlen(cp); 1356 goto skipsize; 1357 } 1358 } 1359 size = bf + KPRINTF_BUFSIZE - cp; 1360 skipsize: 1361 break; 1362 default: /* "%?" prints ?, unless ? is NUL */ 1363 if (ch == '\0') 1364 goto done; 1365 /* pretend it was %c with argument ch */ 1366 cp = bf; 1367 *cp = ch; 1368 size = 1; 1369 sign = '\0'; 1370 break; 1371 } 1372 1373 /* 1374 * All reasonable formats wind up here. At this point, `cp' 1375 * points to a string which (if not flags&LADJUST) should be 1376 * padded out to `width' places. If flags&ZEROPAD, it should 1377 * first be prefixed by any sign or other prefix; otherwise, 1378 * it should be blank padded before the prefix is emitted. 1379 * After any left-hand padding and prefixing, emit zeroes 1380 * required by a decimal [diouxX] precision, then print the 1381 * string proper, then emit zeroes required by any leftover 1382 * floating precision; finally, if LADJUST, pad with blanks. 1383 * 1384 * Compute actual size, so we know how much to pad. 1385 * size excludes decimal prec; realsz includes it. 1386 */ 1387 realsz = dprec > size ? dprec : size; 1388 if (sign) 1389 realsz++; 1390 else if (flags & HEXPREFIX) 1391 realsz+= 2; 1392 1393 /* adjust ret */ 1394 ret += width > realsz ? width : realsz; 1395 1396 /* right-adjusting blank padding */ 1397 if ((flags & (LADJUST|ZEROPAD)) == 0) { 1398 n = width - realsz; 1399 while (n-- > 0) 1400 KPRINTF_PUTCHAR(' '); 1401 } 1402 1403 /* prefix */ 1404 if (sign) { 1405 KPRINTF_PUTCHAR(sign); 1406 } else if (flags & HEXPREFIX) { 1407 KPRINTF_PUTCHAR('0'); 1408 KPRINTF_PUTCHAR(ch); 1409 } 1410 1411 /* right-adjusting zero padding */ 1412 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) { 1413 n = width - realsz; 1414 while (n-- > 0) 1415 KPRINTF_PUTCHAR('0'); 1416 } 1417 1418 /* leading zeroes from decimal precision */ 1419 n = dprec - size; 1420 while (n-- > 0) 1421 KPRINTF_PUTCHAR('0'); 1422 1423 /* the string or number proper */ 1424 while (size--) 1425 KPRINTF_PUTCHAR(*cp++); 1426 /* left-adjusting padding (always blank) */ 1427 if (flags & LADJUST) { 1428 n = width - realsz; 1429 while (n-- > 0) 1430 KPRINTF_PUTCHAR(' '); 1431 } 1432 } 1433 1434 done: 1435 if ((oflags == TOBUFONLY) && (vp != NULL)) 1436 *(char **)vp = sbuf; 1437 (*v_flush)(); 1438 overflow: 1439 return (ret); 1440 /* NOTREACHED */ 1441 } 1442
Indexes created Sun Sep 21 20:09:37 GMT 2025