1 /* $OpenBSD: subr_prf.c,v 1.69 2006/12/11 05:08:18 deraadt Exp $ */ 2 /* $NetBSD: subr_prf.c,v 1.45 1997/10/24 18:14:25 chuck Exp $ */ 3 4 /*- 5 * Copyright (c) 1986, 1988, 1991, 1993 6 * The Regents of the University of California. All rights reserved. 7 * (c) UNIX System Laboratories, Inc. 8 * All or some portions of this file are derived from material licensed 9 * to the University of California by American Telephone and Telegraph 10 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 11 * the permission of UNIX System Laboratories, Inc. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * @(#)subr_prf.c 8.3 (Berkeley) 1/21/94 38 */ 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/buf.h> 43 #include <sys/conf.h> 44 #include <sys/reboot.h> 45 #include <sys/msgbuf.h> 46 #include <sys/proc.h> 47 #include <sys/ioctl.h> 48 #include <sys/vnode.h> 49 #include <sys/file.h> 50 #include <sys/tty.h> 51 #include <sys/tprintf.h> 52 #include <sys/syslog.h> 53 #include <sys/malloc.h> 54 #include <sys/pool.h> 55 #include <sys/mutex.h> 56 57 #include <dev/cons.h> 58 59 /* 60 * note that stdarg.h and the ansi style va_start macro is used for both 61 * ansi and traditional c compilers. 62 */ 63 #include <sys/stdarg.h> 64 65 #ifdef KGDB 66 #include <sys/kgdb.h> 67 #include <machine/cpu.h> 68 #endif 69 #ifdef DDB 70 #include <ddb/db_output.h> /* db_printf, db_putchar prototypes */ 71 #include <ddb/db_var.h> /* db_log, db_radix */ 72 #endif 73 #if defined(UVM_SWAP_ENCRYPT) 74 extern int uvm_doswapencrypt; 75 #endif 76 77 78 /* 79 * defines 80 */ 81 82 /* flags for kprintf */ 83 #define TOCONS 0x01 /* to the console */ 84 #define TOTTY 0x02 /* to the process' tty */ 85 #define TOLOG 0x04 /* to the kernel message buffer */ 86 #define TOBUFONLY 0x08 /* to the buffer (only) [for snprintf] */ 87 #define TODDB 0x10 /* to ddb console */ 88 #define TOCOUNT 0x20 /* act like [v]snprintf */ 89 90 /* max size buffer kprintf needs to print quad_t [size in base 8 + \0] */ 91 #define KPRINTF_BUFSIZE (sizeof(quad_t) * NBBY / 3 + 2) 92 93 94 /* 95 * local prototypes 96 */ 97 98 int kprintf(const char *, int, void *, char *, va_list); 99 void kputchar(int, int, struct tty *); 100 101 struct mutex kprintf_mutex = MUTEX_INITIALIZER(IPL_HIGH); 102 103 /* 104 * globals 105 */ 106 107 extern struct tty *constty; /* pointer to console "window" tty */ 108 int consintr = 1; /* ok to handle console interrupts? */ 109 extern int log_open; /* subr_log: is /dev/klog open? */ 110 const char *panicstr; /* arg to first call to panic (used as a flag 111 to indicate that panic has already been called). */ 112 #ifdef DDB 113 /* 114 * Enter ddb on panic. 115 */ 116 int db_panic = 1; 117 118 /* 119 * db_console controls if we can be able to enter ddb by a special key 120 * combination (machine dependent). 121 * If DDB_SAFE_CONSOLE is defined in the kernel configuration it allows 122 * to break into console during boot. It's _really_ useful when debugging 123 * some things in the kernel that can cause init(8) to crash. 124 */ 125 #ifdef DDB_SAFE_CONSOLE 126 int db_console = 1; 127 #else 128 int db_console = 0; 129 #endif 130 #endif 131 132 /* 133 * panic on spl assertion failure? 134 */ 135 int splassert_ctl = 0; 136 137 /* 138 * v_putc: routine to putc on virtual console 139 * 140 * the v_putc pointer can be used to redirect the console cnputc elsewhere 141 * [e.g. to a "virtual console"]. 142 */ 143 144 void (*v_putc)(int) = cnputc; /* start with cnputc (normal cons) */ 145 146 147 /* 148 * functions 149 */ 150 151 /* 152 * Partial support (the failure case) of the assertion facility 153 * commonly found in userland. 154 */ 155 void 156 __assert(const char *t, const char *f, int l, const char *e) 157 { 158 159 panic("kernel %sassertion \"%s\" failed: file \"%s\", line %d", 160 t, e, f, l); 161 } 162 163 /* 164 * tablefull: warn that a system table is full 165 */ 166 167 void 168 tablefull(const char *tab) 169 { 170 log(LOG_ERR, "%s: table is full\n", tab); 171 } 172 173 /* 174 * panic: handle an unresolvable fatal error 175 * 176 * prints "panic: <message>" and reboots. if called twice (i.e. recursive 177 * call) we avoid trying to sync the disk and just reboot (to avoid 178 * recursive panics). 179 */ 180 181 void 182 panic(const char *fmt, ...) 183 { 184 static char panicbuf[512]; 185 int bootopt; 186 va_list ap; 187 188 bootopt = RB_AUTOBOOT | RB_DUMP; 189 #if defined(UVM_SWAP_ENCRYPT) 190 if (uvm_doswapencrypt) 191 bootopt &= ~RB_DUMP; 192 #endif 193 va_start(ap, fmt); 194 if (panicstr) 195 bootopt |= RB_NOSYNC; 196 else { 197 vsnprintf(panicbuf, sizeof panicbuf, fmt, ap); 198 panicstr = panicbuf; 199 } 200 va_end(ap); 201 202 printf("panic: "); 203 va_start(ap, fmt); 204 vprintf(fmt, ap); 205 printf("\n"); 206 va_end(ap); 207 208 #ifdef KGDB 209 kgdb_panic(); 210 #endif 211 #ifdef KADB 212 if (boothowto & RB_KDB) 213 kdbpanic(); 214 #endif 215 #ifdef DDB 216 if (db_panic) 217 Debugger(); 218 else 219 db_stack_dump(); 220 #endif 221 boot(bootopt); 222 } 223 224 /* 225 * We print only the function name. The file name is usually very long and 226 * would eat tons of space in the kernel. 227 */ 228 void 229 splassert_fail(int wantipl, int haveipl, const char *func) 230 { 231 232 printf("splassert: %s: want %d have %d\n", func, wantipl, haveipl); 233 switch (splassert_ctl) { 234 case 1: 235 break; 236 case 2: 237 #ifdef DDB 238 db_stack_dump(); 239 #endif 240 break; 241 case 3: 242 #ifdef DDB 243 db_stack_dump(); 244 Debugger(); 245 #endif 246 break; 247 default: 248 panic("spl assertion failure in %s", func); 249 } 250 } 251 252 /* 253 * kernel logging functions: log, logpri, addlog 254 */ 255 256 /* 257 * log: write to the log buffer 258 * 259 * => will not sleep [so safe to call from interrupt] 260 * => will log to console if /dev/klog isn't open 261 */ 262 263 void 264 log(int level, const char *fmt, ...) 265 { 266 int s; 267 va_list ap; 268 269 s = splhigh(); 270 logpri(level); /* log the level first */ 271 va_start(ap, fmt); 272 kprintf(fmt, TOLOG, NULL, NULL, ap); 273 va_end(ap); 274 splx(s); 275 if (!log_open) { 276 va_start(ap, fmt); 277 kprintf(fmt, TOCONS, NULL, NULL, ap); 278 va_end(ap); 279 } 280 logwakeup(); /* wake up anyone waiting for log msgs */ 281 } 282 283 /* 284 * logpri: log the priority level to the klog 285 */ 286 287 void 288 logpri(int level) 289 { 290 char *p; 291 char snbuf[KPRINTF_BUFSIZE]; 292 293 kputchar('<', TOLOG, NULL); 294 snprintf(snbuf, sizeof snbuf, "%d", level); 295 for (p = snbuf ; *p ; p++) 296 kputchar(*p, TOLOG, NULL); 297 kputchar('>', TOLOG, NULL); 298 } 299 300 /* 301 * addlog: add info to previous log message 302 */ 303 304 int 305 addlog(const char *fmt, ...) 306 { 307 int s; 308 va_list ap; 309 310 s = splhigh(); 311 va_start(ap, fmt); 312 kprintf(fmt, TOLOG, NULL, NULL, ap); 313 va_end(ap); 314 splx(s); 315 if (!log_open) { 316 va_start(ap, fmt); 317 kprintf(fmt, TOCONS, NULL, NULL, ap); 318 va_end(ap); 319 } 320 logwakeup(); 321 return(0); 322 } 323 324 325 /* 326 * kputchar: print a single character on console or user terminal. 327 * 328 * => if console, then the last MSGBUFS chars are saved in msgbuf 329 * for inspection later (e.g. dmesg/syslog) 330 */ 331 void 332 kputchar(int c, int flags, struct tty *tp) 333 { 334 extern int msgbufmapped; 335 336 if (panicstr) 337 constty = NULL; 338 if ((flags & TOCONS) && tp == NULL && constty) { 339 tp = constty; 340 flags |= TOTTY; 341 } 342 if ((flags & TOTTY) && tp && tputchar(c, tp) < 0 && 343 (flags & TOCONS) && tp == constty) 344 constty = NULL; 345 if ((flags & TOLOG) && 346 c != '\0' && c != '\r' && c != 0177 && msgbufmapped) 347 msgbuf_putchar(c); 348 if ((flags & TOCONS) && constty == NULL && c != '\0') 349 (*v_putc)(c); 350 #ifdef DDB 351 if (flags & TODDB) 352 db_putchar(c); 353 #endif 354 } 355 356 357 /* 358 * uprintf: print to the controlling tty of the current process 359 * 360 * => we may block if the tty queue is full 361 * => no message is printed if the queue doesn't clear in a reasonable 362 * time 363 */ 364 365 void 366 uprintf(const char *fmt, ...) 367 { 368 struct proc *p = curproc; 369 va_list ap; 370 371 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) { 372 va_start(ap, fmt); 373 kprintf(fmt, TOTTY, p->p_session->s_ttyp, NULL, ap); 374 va_end(ap); 375 } 376 } 377 378 #if defined(NFSSERVER) || defined(NFSCLIENT) 379 380 /* 381 * tprintf functions: used to send messages to a specific process 382 * 383 * usage: 384 * get a tpr_t handle on a process "p" by using "tprintf_open(p)" 385 * use the handle when calling "tprintf" 386 * when done, do a "tprintf_close" to drop the handle 387 */ 388 389 /* 390 * tprintf_open: get a tprintf handle on a process "p" 391 * 392 * => returns NULL if process can't be printed to 393 */ 394 395 tpr_t 396 tprintf_open(struct proc *p) 397 { 398 399 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) { 400 SESSHOLD(p->p_session); 401 return ((tpr_t) p->p_session); 402 } 403 return ((tpr_t) NULL); 404 } 405 406 /* 407 * tprintf_close: dispose of a tprintf handle obtained with tprintf_open 408 */ 409 410 void 411 tprintf_close(tpr_t sess) 412 { 413 414 if (sess) 415 SESSRELE((struct session *) sess); 416 } 417 418 /* 419 * tprintf: given tprintf handle to a process [obtained with tprintf_open], 420 * send a message to the controlling tty for that process. 421 * 422 * => also sends message to /dev/klog 423 */ 424 void 425 tprintf(tpr_t tpr, const char *fmt, ...) 426 { 427 struct session *sess = (struct session *)tpr; 428 struct tty *tp = NULL; 429 int flags = TOLOG; 430 va_list ap; 431 432 logpri(LOG_INFO); 433 if (sess && sess->s_ttyvp && ttycheckoutq(sess->s_ttyp, 0)) { 434 flags |= TOTTY; 435 tp = sess->s_ttyp; 436 } 437 va_start(ap, fmt); 438 kprintf(fmt, flags, tp, NULL, ap); 439 va_end(ap); 440 logwakeup(); 441 } 442 443 #endif /* NFSSERVER || NFSCLIENT */ 444 445 446 /* 447 * ttyprintf: send a message to a specific tty 448 * 449 * => should be used only by tty driver or anything that knows the 450 * underlying tty will not be revoked(2)'d away. [otherwise, 451 * use tprintf] 452 */ 453 void 454 ttyprintf(struct tty *tp, const char *fmt, ...) 455 { 456 va_list ap; 457 458 va_start(ap, fmt); 459 kprintf(fmt, TOTTY, tp, NULL, ap); 460 va_end(ap); 461 } 462 463 #ifdef DDB 464 465 /* 466 * db_printf: printf for DDB (via db_putchar) 467 */ 468 469 int 470 db_printf(const char *fmt, ...) 471 { 472 va_list ap; 473 int flags, retval; 474 475 flags = TODDB; 476 if (db_log) 477 flags |= TOLOG; 478 va_start(ap, fmt); 479 retval = kprintf(fmt, flags, NULL, NULL, ap); 480 va_end(ap); 481 return(retval); 482 } 483 484 #endif /* DDB */ 485 486 487 /* 488 * normal kernel printf functions: printf, vprintf, snprintf 489 */ 490 491 /* 492 * printf: print a message to the console and the log 493 */ 494 int 495 printf(const char *fmt, ...) 496 { 497 va_list ap; 498 int savintr, retval; 499 500 mtx_enter(&kprintf_mutex); 501 502 savintr = consintr; /* disable interrupts */ 503 consintr = 0; 504 va_start(ap, fmt); 505 retval = kprintf(fmt, TOCONS | TOLOG, NULL, NULL, ap); 506 va_end(ap); 507 if (!panicstr) 508 logwakeup(); 509 consintr = savintr; /* reenable interrupts */ 510 511 mtx_leave(&kprintf_mutex); 512 513 return(retval); 514 } 515 516 /* 517 * vprintf: print a message to the console and the log [already have a 518 * va_list] 519 */ 520 521 int 522 vprintf(const char *fmt, va_list ap) 523 { 524 int savintr, retval; 525 526 mtx_enter(&kprintf_mutex); 527 528 savintr = consintr; /* disable interrupts */ 529 consintr = 0; 530 retval = kprintf(fmt, TOCONS | TOLOG, NULL, NULL, ap); 531 if (!panicstr) 532 logwakeup(); 533 consintr = savintr; /* reenable interrupts */ 534 535 mtx_leave(&kprintf_mutex); 536 537 return (retval); 538 } 539 540 /* 541 * snprintf: print a message to a buffer 542 */ 543 int 544 snprintf(char *buf, size_t size, const char *fmt, ...) 545 { 546 int retval; 547 va_list ap; 548 char *p; 549 550 p = buf + size - 1; 551 if (size < 1) 552 p = buf; 553 va_start(ap, fmt); 554 retval = kprintf(fmt, TOBUFONLY | TOCOUNT, &p, buf, ap); 555 va_end(ap); 556 if (size > 0) 557 *(p) = 0; /* null terminate */ 558 return(retval); 559 } 560 561 /* 562 * vsnprintf: print a message to a buffer [already have va_alist] 563 */ 564 int 565 vsnprintf(char *buf, size_t size, const char *fmt, va_list ap) 566 { 567 int retval; 568 char *p; 569 570 p = buf + size - 1; 571 if (size < 1) 572 p = buf; 573 retval = kprintf(fmt, TOBUFONLY | TOCOUNT, &p, buf, ap); 574 if (size > 0) 575 *(p) = 0; /* null terminate */ 576 return(retval); 577 } 578 579 /* 580 * kprintf: scaled down version of printf(3). 581 * 582 * this version based on vfprintf() from libc which was derived from 583 * software contributed to Berkeley by Chris Torek. 584 * 585 * Two additional formats: 586 * 587 * The format %b is supported to decode error registers. 588 * Its usage is: 589 * 590 * printf("reg=%b\n", regval, "<base><arg>*"); 591 * 592 * where <base> is the output base expressed as a control character, e.g. 593 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters, 594 * the first of which gives the bit number to be inspected (origin 1), and 595 * the next characters (up to a control character, i.e. a character <= 32), 596 * give the name of the register. Thus: 597 * 598 * kprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n"); 599 * 600 * would produce output: 601 * 602 * reg=3<BITTWO,BITONE> 603 * 604 * To support larger integers (> 32 bits), %b formatting will also accept 605 * control characters in the region 0x80 - 0xff. 0x80 refers to bit 0, 606 * 0x81 refers to bit 1, and so on. The equivalent string to the above is: 607 * 608 * kprintf("reg=%b\n", 3, "\10\201BITTWO\200BITONE\n"); 609 * 610 * and would produce the same output. 611 * 612 * Like the rest of printf, %b can be prefixed to handle various size 613 * modifiers, eg. %b is for "int", %lb is for "long", and %llb supports 614 * "long long". 615 * 616 * This code is large and complicated... 617 */ 618 619 /* 620 * macros for converting digits to letters and vice versa 621 */ 622 #define to_digit(c) ((c) - '0') 623 #define is_digit(c) ((unsigned)to_digit(c) <= 9) 624 #define to_char(n) ((n) + '0') 625 626 /* 627 * flags used during conversion. 628 */ 629 #define ALT 0x001 /* alternate form */ 630 #define HEXPREFIX 0x002 /* add 0x or 0X prefix */ 631 #define LADJUST 0x004 /* left adjustment */ 632 #define LONGDBL 0x008 /* long double; unimplemented */ 633 #define LONGINT 0x010 /* long integer */ 634 #define QUADINT 0x020 /* quad integer */ 635 #define SHORTINT 0x040 /* short integer */ 636 #define ZEROPAD 0x080 /* zero (as opposed to blank) pad */ 637 #define FPT 0x100 /* Floating point number */ 638 639 /* 640 * To extend shorts properly, we need both signed and unsigned 641 * argument extraction methods. 642 */ 643 #define SARG() \ 644 (flags&QUADINT ? va_arg(ap, quad_t) : \ 645 flags&LONGINT ? va_arg(ap, long) : \ 646 flags&SHORTINT ? (long)(short)va_arg(ap, int) : \ 647 (long)va_arg(ap, int)) 648 #define UARG() \ 649 (flags&QUADINT ? va_arg(ap, u_quad_t) : \ 650 flags&LONGINT ? va_arg(ap, u_long) : \ 651 flags&SHORTINT ? (u_long)(u_short)va_arg(ap, int) : \ 652 (u_long)va_arg(ap, u_int)) 653 654 #define KPRINTF_PUTCHAR(C) do { \ 655 int chr = (C); \ 656 ret += 1; \ 657 if (oflags & TOBUFONLY) { \ 658 if ((vp != NULL) && (sbuf == tailp)) { \ 659 if (!(oflags & TOCOUNT)) \ 660 goto overflow; \ 661 } else \ 662 *sbuf++ = chr; \ 663 } else { \ 664 kputchar(chr, oflags, (struct tty *)vp); \ 665 } \ 666 } while(0) 667 668 int 669 kprintf(const char *fmt0, int oflags, void *vp, char *sbuf, va_list ap) 670 { 671 char *fmt; /* format string */ 672 int ch; /* character from fmt */ 673 int n; /* handy integer (short term usage) */ 674 char *cp = NULL; /* handy char pointer (short term usage) */ 675 int flags; /* flags as above */ 676 int ret; /* return value accumulator */ 677 int width; /* width from format (%8d), or 0 */ 678 int prec; /* precision from format (%.3d), or -1 */ 679 char sign; /* sign prefix (' ', '+', '-', or \0) */ 680 681 u_quad_t _uquad; /* integer arguments %[diouxX] */ 682 enum { OCT, DEC, HEX } base;/* base for [diouxX] conversion */ 683 int dprec; /* a copy of prec if [diouxX], 0 otherwise */ 684 int realsz; /* field size expanded by dprec */ 685 int size = 0; /* size of converted field or string */ 686 char *xdigs = NULL; /* digits for [xX] conversion */ 687 char buf[KPRINTF_BUFSIZE]; /* space for %c, %[diouxX] */ 688 char *tailp = NULL; /* tail pointer for snprintf */ 689 690 if ((oflags & TOBUFONLY) && (vp != NULL)) 691 tailp = *(char **)vp; 692 693 fmt = (char *)fmt0; 694 ret = 0; 695 696 /* 697 * Scan the format for conversions (`%' character). 698 */ 699 for (;;) { 700 while (*fmt != '%' && *fmt) { 701 KPRINTF_PUTCHAR(*fmt++); 702 } 703 if (*fmt == 0) 704 goto done; 705 706 fmt++; /* skip over '%' */ 707 708 flags = 0; 709 dprec = 0; 710 width = 0; 711 prec = -1; 712 sign = '\0'; 713 714 rflag: ch = *fmt++; 715 reswitch: switch (ch) { 716 /* XXX: non-standard '%b' format */ 717 case 'b': { 718 char *b, *z; 719 int tmp; 720 _uquad = UARG(); 721 b = va_arg(ap, char *); 722 if (*b == 8) 723 snprintf(buf, sizeof buf, "%llo", _uquad); 724 else if (*b == 10) 725 snprintf(buf, sizeof buf, "%lld", _uquad); 726 else if (*b == 16) 727 snprintf(buf, sizeof buf, "%llx", _uquad); 728 else 729 break; 730 b++; 731 732 z = buf; 733 while (*z) { 734 KPRINTF_PUTCHAR(*z++); 735 } 736 737 if (_uquad) { 738 tmp = 0; 739 while ((n = *b++) != 0) { 740 if (n & 0x80) 741 n &= 0x7f; 742 else if (n <= ' ') 743 n = n - 1; 744 if (_uquad & (1LL << n)) { 745 KPRINTF_PUTCHAR(tmp ? ',':'<'); 746 while (*b > ' ' && 747 (*b & 0x80) == 0) { 748 KPRINTF_PUTCHAR(*b); 749 b++; 750 } 751 tmp = 1; 752 } else { 753 while (*b > ' ' && 754 (*b & 0x80) == 0) 755 b++; 756 } 757 } 758 if (tmp) { 759 KPRINTF_PUTCHAR('>'); 760 } 761 } 762 continue; /* no output */ 763 } 764 765 #ifdef DDB 766 /* XXX: non-standard '%r' format (print int in db_radix) */ 767 case 'r': 768 if ((oflags & TODDB) == 0) 769 goto default_case; 770 771 if (db_radix == 16) 772 goto case_z; /* signed hex */ 773 _uquad = SARG(); 774 if ((quad_t)_uquad < 0) { 775 _uquad = -_uquad; 776 sign = '-'; 777 } 778 base = (db_radix == 8) ? OCT : DEC; 779 goto number; 780 781 782 /* XXX: non-standard '%z' format ("signed hex", a "hex %i")*/ 783 case 'z': 784 case_z: 785 if ((oflags & TODDB) == 0) 786 goto default_case; 787 788 xdigs = "0123456789abcdef"; 789 ch = 'x'; /* the 'x' in '0x' (below) */ 790 _uquad = SARG(); 791 base = HEX; 792 /* leading 0x/X only if non-zero */ 793 if (flags & ALT && _uquad != 0) 794 flags |= HEXPREFIX; 795 if ((quad_t)_uquad < 0) { 796 _uquad = -_uquad; 797 sign = '-'; 798 } 799 goto number; 800 #endif 801 802 case ' ': 803 /* 804 * ``If the space and + flags both appear, the space 805 * flag will be ignored.'' 806 * -- ANSI X3J11 807 */ 808 if (!sign) 809 sign = ' '; 810 goto rflag; 811 case '#': 812 flags |= ALT; 813 goto rflag; 814 case '*': 815 /* 816 * ``A negative field width argument is taken as a 817 * - flag followed by a positive field width.'' 818 * -- ANSI X3J11 819 * They don't exclude field widths read from args. 820 */ 821 if ((width = va_arg(ap, int)) >= 0) 822 goto rflag; 823 width = -width; 824 /* FALLTHROUGH */ 825 case '-': 826 flags |= LADJUST; 827 goto rflag; 828 case '+': 829 sign = '+'; 830 goto rflag; 831 case '.': 832 if ((ch = *fmt++) == '*') { 833 n = va_arg(ap, int); 834 prec = n < 0 ? -1 : n; 835 goto rflag; 836 } 837 n = 0; 838 while (is_digit(ch)) { 839 n = 10 * n + to_digit(ch); 840 ch = *fmt++; 841 } 842 prec = n < 0 ? -1 : n; 843 goto reswitch; 844 case '0': 845 /* 846 * ``Note that 0 is taken as a flag, not as the 847 * beginning of a field width.'' 848 * -- ANSI X3J11 849 */ 850 flags |= ZEROPAD; 851 goto rflag; 852 case '1': case '2': case '3': case '4': 853 case '5': case '6': case '7': case '8': case '9': 854 n = 0; 855 do { 856 n = 10 * n + to_digit(ch); 857 ch = *fmt++; 858 } while (is_digit(ch)); 859 width = n; 860 goto reswitch; 861 case 'h': 862 flags |= SHORTINT; 863 goto rflag; 864 case 'l': 865 if (*fmt == 'l') { 866 fmt++; 867 flags |= QUADINT; 868 } else { 869 flags |= LONGINT; 870 } 871 goto rflag; 872 case 'q': 873 flags |= QUADINT; 874 goto rflag; 875 case 'c': 876 *(cp = buf) = va_arg(ap, int); 877 size = 1; 878 sign = '\0'; 879 break; 880 case 'D': 881 flags |= LONGINT; 882 /*FALLTHROUGH*/ 883 case 'd': 884 case 'i': 885 _uquad = SARG(); 886 if ((quad_t)_uquad < 0) { 887 _uquad = -_uquad; 888 sign = '-'; 889 } 890 base = DEC; 891 goto number; 892 case 'n': 893 #ifdef DDB 894 /* XXX: non-standard '%n' format */ 895 /* 896 * XXX: HACK! DDB wants '%n' to be a '%u' printed 897 * in db_radix format. this should die since '%n' 898 * is already defined in standard printf to write 899 * the number of chars printed so far to the arg (which 900 * should be a pointer. 901 */ 902 if (oflags & TODDB) { 903 if (db_radix == 16) 904 ch = 'x'; /* convert to %x */ 905 else if (db_radix == 8) 906 ch = 'o'; /* convert to %o */ 907 else 908 ch = 'u'; /* convert to %u */ 909 910 /* ... and start again */ 911 goto reswitch; 912 } 913 914 #endif 915 if (flags & QUADINT) 916 *va_arg(ap, quad_t *) = ret; 917 else if (flags & LONGINT) 918 *va_arg(ap, long *) = ret; 919 else if (flags & SHORTINT) 920 *va_arg(ap, short *) = ret; 921 else 922 *va_arg(ap, int *) = ret; 923 continue; /* no output */ 924 case 'O': 925 flags |= LONGINT; 926 /*FALLTHROUGH*/ 927 case 'o': 928 _uquad = UARG(); 929 base = OCT; 930 goto nosign; 931 case 'p': 932 /* 933 * ``The argument shall be a pointer to void. The 934 * value of the pointer is converted to a sequence 935 * of printable characters, in an implementation- 936 * defined manner.'' 937 * -- ANSI X3J11 938 */ 939 /* NOSTRICT */ 940 _uquad = (u_long)va_arg(ap, void *); 941 base = HEX; 942 xdigs = "0123456789abcdef"; 943 flags |= HEXPREFIX; 944 ch = 'x'; 945 goto nosign; 946 case 's': 947 if ((cp = va_arg(ap, char *)) == NULL) 948 cp = "(null)"; 949 if (prec >= 0) { 950 /* 951 * can't use strlen; can only look for the 952 * NUL in the first `prec' characters, and 953 * strlen() will go further. 954 */ 955 char *p = memchr(cp, 0, prec); 956 957 if (p != NULL) { 958 size = p - cp; 959 if (size > prec) 960 size = prec; 961 } else 962 size = prec; 963 } else 964 size = strlen(cp); 965 sign = '\0'; 966 break; 967 case 'U': 968 flags |= LONGINT; 969 /*FALLTHROUGH*/ 970 case 'u': 971 _uquad = UARG(); 972 base = DEC; 973 goto nosign; 974 case 'X': 975 xdigs = "0123456789ABCDEF"; 976 goto hex; 977 case 'x': 978 xdigs = "0123456789abcdef"; 979 hex: _uquad = UARG(); 980 base = HEX; 981 /* leading 0x/X only if non-zero */ 982 if (flags & ALT && _uquad != 0) 983 flags |= HEXPREFIX; 984 985 /* unsigned conversions */ 986 nosign: sign = '\0'; 987 /* 988 * ``... diouXx conversions ... if a precision is 989 * specified, the 0 flag will be ignored.'' 990 * -- ANSI X3J11 991 */ 992 number: if ((dprec = prec) >= 0) 993 flags &= ~ZEROPAD; 994 995 /* 996 * ``The result of converting a zero value with an 997 * explicit precision of zero is no characters.'' 998 * -- ANSI X3J11 999 */ 1000 cp = buf + KPRINTF_BUFSIZE; 1001 if (_uquad != 0 || prec != 0) { 1002 /* 1003 * Unsigned mod is hard, and unsigned mod 1004 * by a constant is easier than that by 1005 * a variable; hence this switch. 1006 */ 1007 switch (base) { 1008 case OCT: 1009 do { 1010 *--cp = to_char(_uquad & 7); 1011 _uquad >>= 3; 1012 } while (_uquad); 1013 /* handle octal leading 0 */ 1014 if (flags & ALT && *cp != '0') 1015 *--cp = '0'; 1016 break; 1017 1018 case DEC: 1019 /* many numbers are 1 digit */ 1020 while (_uquad >= 10) { 1021 *--cp = to_char(_uquad % 10); 1022 _uquad /= 10; 1023 } 1024 *--cp = to_char(_uquad); 1025 break; 1026 1027 case HEX: 1028 do { 1029 *--cp = xdigs[_uquad & 15]; 1030 _uquad >>= 4; 1031 } while (_uquad); 1032 break; 1033 1034 default: 1035 cp = "bug in kprintf: bad base"; 1036 size = strlen(cp); 1037 goto skipsize; 1038 } 1039 } 1040 size = buf + KPRINTF_BUFSIZE - cp; 1041 skipsize: 1042 break; 1043 default: /* "%?" prints ?, unless ? is NUL */ 1044 #ifdef DDB 1045 default_case: /* DDB */ 1046 #endif 1047 if (ch == '\0') 1048 goto done; 1049 /* pretend it was %c with argument ch */ 1050 cp = buf; 1051 *cp = ch; 1052 size = 1; 1053 sign = '\0'; 1054 break; 1055 } 1056 1057 /* 1058 * All reasonable formats wind up here. At this point, `cp' 1059 * points to a string which (if not flags&LADJUST) should be 1060 * padded out to `width' places. If flags&ZEROPAD, it should 1061 * first be prefixed by any sign or other prefix; otherwise, 1062 * it should be blank padded before the prefix is emitted. 1063 * After any left-hand padding and prefixing, emit zeroes 1064 * required by a decimal [diouxX] precision, then print the 1065 * string proper, then emit zeroes required by any leftover 1066 * floating precision; finally, if LADJUST, pad with blanks. 1067 * 1068 * Compute actual size, so we know how much to pad. 1069 * size excludes decimal prec; realsz includes it. 1070 */ 1071 realsz = dprec > size ? dprec : size; 1072 if (sign) 1073 realsz++; 1074 else if (flags & HEXPREFIX) 1075 realsz+= 2; 1076 1077 /* right-adjusting blank padding */ 1078 if ((flags & (LADJUST|ZEROPAD)) == 0) { 1079 n = width - realsz; 1080 while (n-- > 0) 1081 KPRINTF_PUTCHAR(' '); 1082 } 1083 1084 /* prefix */ 1085 if (sign) { 1086 KPRINTF_PUTCHAR(sign); 1087 } else if (flags & HEXPREFIX) { 1088 KPRINTF_PUTCHAR('0'); 1089 KPRINTF_PUTCHAR(ch); 1090 } 1091 1092 /* right-adjusting zero padding */ 1093 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) { 1094 n = width - realsz; 1095 while (n-- > 0) 1096 KPRINTF_PUTCHAR('0'); 1097 } 1098 1099 /* leading zeroes from decimal precision */ 1100 n = dprec - size; 1101 while (n-- > 0) 1102 KPRINTF_PUTCHAR('0'); 1103 1104 /* the string or number proper */ 1105 while (size--) 1106 KPRINTF_PUTCHAR(*cp++); 1107 /* left-adjusting padding (always blank) */ 1108 if (flags & LADJUST) { 1109 n = width - realsz; 1110 while (n-- > 0) 1111 KPRINTF_PUTCHAR(' '); 1112 } 1113 } 1114 1115 done: 1116 if ((oflags & TOBUFONLY) && (vp != NULL)) 1117 *(char **)vp = sbuf; 1118 overflow: 1119 return (ret); 1120 /* NOTREACHED */ 1121 } 1122 1123 #if __GNUC_PREREQ__(2,96) 1124 /* 1125 * XXX - these functions shouldn't be in the kernel, but gcc 3.X feels like 1126 * translating some printf calls to puts and since it doesn't seem 1127 * possible to just turn off parts of those optimizations (some of 1128 * them are really useful), we have to provide a dummy puts and putchar 1129 * that are wrappers around printf. 1130 */ 1131 int puts(const char *); 1132 int putchar(int c); 1133 1134 int 1135 puts(const char *str) 1136 { 1137 printf("%s\n", str); 1138 1139 return (0); 1140 } 1141 1142 int 1143 putchar(int c) 1144 { 1145 printf("%c", c); 1146 1147 return (c); 1148 } 1149 1150 1151 #endif 1152