1 /* $OpenBSD: subr_prf.c,v 1.76 2011/04/03 16:46:19 drahn 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 74 75 /* 76 * defines 77 */ 78 79 /* flags for kprintf */ 80 #define TOCONS 0x01 /* to the console */ 81 #define TOTTY 0x02 /* to the process' tty */ 82 #define TOLOG 0x04 /* to the kernel message buffer */ 83 #define TOBUFONLY 0x08 /* to the buffer (only) [for snprintf] */ 84 #define TODDB 0x10 /* to ddb console */ 85 #define TOCOUNT 0x20 /* act like [v]snprintf */ 86 87 /* max size buffer kprintf needs to print quad_t [size in base 8 + \0] */ 88 #define KPRINTF_BUFSIZE (sizeof(quad_t) * NBBY / 3 + 2) 89 90 91 /* 92 * local prototypes 93 */ 94 95 int kprintf(const char *, int, void *, char *, va_list); 96 void kputchar(int, int, struct tty *); 97 98 struct mutex kprintf_mutex = MUTEX_INITIALIZER(IPL_HIGH); 99 100 /* 101 * globals 102 */ 103 104 extern struct tty *constty; /* pointer to console "window" tty */ 105 extern int log_open; /* subr_log: is /dev/klog open? */ 106 const char *panicstr; /* arg to first call to panic (used as a flag 107 to indicate that panic has already been called). */ 108 #ifdef DDB 109 /* 110 * Enter ddb on panic. 111 */ 112 int db_panic = 1; 113 114 /* 115 * db_console controls if we can be able to enter ddb by a special key 116 * combination (machine dependent). 117 * If DDB_SAFE_CONSOLE is defined in the kernel configuration it allows 118 * to break into console during boot. It's _really_ useful when debugging 119 * some things in the kernel that can cause init(8) to crash. 120 */ 121 #ifdef DDB_SAFE_CONSOLE 122 int db_console = 1; 123 #else 124 int db_console = 0; 125 #endif 126 127 /* 128 * flag to indicate if we are currently in ddb (on some processor) 129 */ 130 int db_is_active; 131 #endif 132 133 /* 134 * panic on spl assertion failure? 135 */ 136 int splassert_ctl = 1; 137 138 /* 139 * v_putc: routine to putc on virtual console 140 * 141 * the v_putc pointer can be used to redirect the console cnputc elsewhere 142 * [e.g. to a "virtual console"]. 143 */ 144 145 void (*v_putc)(int) = cnputc; /* start with cnputc (normal cons) */ 146 147 148 /* 149 * functions 150 */ 151 152 /* 153 * Partial support (the failure case) of the assertion facility 154 * commonly found in userland. 155 */ 156 void 157 __assert(const char *t, const char *f, int l, const char *e) 158 { 159 160 panic("kernel %sassertion \"%s\" failed: file \"%s\", line %d", 161 t, e, f, l); 162 } 163 164 /* 165 * tablefull: warn that a system table is full 166 */ 167 168 void 169 tablefull(const char *tab) 170 { 171 log(LOG_ERR, "%s: table is full\n", tab); 172 } 173 174 /* 175 * panic: handle an unresolvable fatal error 176 * 177 * prints "panic: <message>" and reboots. if called twice (i.e. recursive 178 * call) we avoid trying to sync the disk and just reboot (to avoid 179 * recursive panics). 180 */ 181 182 void 183 panic(const char *fmt, ...) 184 { 185 static char panicbuf[512]; 186 int bootopt; 187 va_list ap; 188 189 bootopt = RB_AUTOBOOT | RB_DUMP; 190 va_start(ap, fmt); 191 if (panicstr) 192 bootopt |= RB_NOSYNC; 193 else { 194 vsnprintf(panicbuf, sizeof panicbuf, fmt, ap); 195 panicstr = panicbuf; 196 } 197 va_end(ap); 198 199 printf("panic: "); 200 va_start(ap, fmt); 201 vprintf(fmt, ap); 202 printf("\n"); 203 va_end(ap); 204 205 #ifdef KGDB 206 kgdb_panic(); 207 #endif 208 #ifdef KADB 209 if (boothowto & RB_KDB) 210 kdbpanic(); 211 #endif 212 #ifdef DDB 213 if (db_panic) 214 Debugger(); 215 else 216 db_stack_dump(); 217 #endif 218 boot(bootopt); 219 } 220 221 /* 222 * We print only the function name. The file name is usually very long and 223 * would eat tons of space in the kernel. 224 */ 225 void 226 splassert_fail(int wantipl, int haveipl, const char *func) 227 { 228 229 printf("splassert: %s: want %d have %d\n", func, wantipl, haveipl); 230 switch (splassert_ctl) { 231 case 1: 232 break; 233 case 2: 234 #ifdef DDB 235 db_stack_dump(); 236 #endif 237 break; 238 case 3: 239 #ifdef DDB 240 db_stack_dump(); 241 Debugger(); 242 #endif 243 break; 244 default: 245 panic("spl assertion failure in %s", func); 246 } 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 s = splhigh(); 267 logpri(level); /* log the level first */ 268 va_start(ap, fmt); 269 kprintf(fmt, TOLOG, NULL, NULL, ap); 270 va_end(ap); 271 splx(s); 272 if (!log_open) { 273 va_start(ap, fmt); 274 kprintf(fmt, TOCONS, NULL, NULL, ap); 275 va_end(ap); 276 } 277 logwakeup(); /* wake up anyone waiting for log msgs */ 278 } 279 280 /* 281 * logpri: log the priority level to the klog 282 */ 283 284 void 285 logpri(int level) 286 { 287 char *p; 288 char snbuf[KPRINTF_BUFSIZE]; 289 290 kputchar('<', TOLOG, NULL); 291 snprintf(snbuf, sizeof snbuf, "%d", level); 292 for (p = snbuf ; *p ; p++) 293 kputchar(*p, TOLOG, NULL); 294 kputchar('>', TOLOG, NULL); 295 } 296 297 /* 298 * addlog: add info to previous log message 299 */ 300 301 int 302 addlog(const char *fmt, ...) 303 { 304 int s; 305 va_list ap; 306 307 s = splhigh(); 308 va_start(ap, fmt); 309 kprintf(fmt, TOLOG, NULL, NULL, ap); 310 va_end(ap); 311 splx(s); 312 if (!log_open) { 313 va_start(ap, fmt); 314 kprintf(fmt, TOCONS, NULL, NULL, ap); 315 va_end(ap); 316 } 317 logwakeup(); 318 return(0); 319 } 320 321 322 /* 323 * kputchar: print a single character on console or user terminal. 324 * 325 * => if console, then the last MSGBUFS chars are saved in msgbuf 326 * for inspection later (e.g. dmesg/syslog) 327 */ 328 void 329 kputchar(int c, int flags, struct tty *tp) 330 { 331 extern int msgbufmapped; 332 int ddb_active = 0; 333 334 #ifdef DDB 335 ddb_active = db_is_active; 336 #endif 337 338 if (panicstr) 339 constty = NULL; 340 341 if ((flags & TOCONS) && tp == NULL && constty && !ddb_active) { 342 tp = constty; 343 flags |= TOTTY; 344 } 345 if ((flags & TOTTY) && tp && tputchar(c, tp) < 0 && 346 (flags & TOCONS) && tp == constty) 347 constty = NULL; 348 if ((flags & TOLOG) && 349 c != '\0' && c != '\r' && c != 0177 && msgbufmapped) 350 msgbuf_putchar(c); 351 if ((flags & TOCONS) && (constty == NULL || ddb_active) && c != '\0') 352 (*v_putc)(c); 353 #ifdef DDB 354 if (flags & TODDB) 355 db_putchar(c); 356 #endif 357 } 358 359 360 /* 361 * uprintf: print to the controlling tty of the current process 362 * 363 * => we may block if the tty queue is full 364 * => no message is printed if the queue doesn't clear in a reasonable 365 * time 366 */ 367 368 void 369 uprintf(const char *fmt, ...) 370 { 371 struct process *pr = curproc->p_p; 372 va_list ap; 373 374 if (pr->ps_flags & PS_CONTROLT && pr->ps_session->s_ttyvp) { 375 va_start(ap, fmt); 376 kprintf(fmt, TOTTY, pr->ps_session->s_ttyp, NULL, ap); 377 va_end(ap); 378 } 379 } 380 381 #if defined(NFSSERVER) || defined(NFSCLIENT) 382 383 /* 384 * tprintf functions: used to send messages to a specific process 385 * 386 * usage: 387 * get a tpr_t handle on a process "p" by using "tprintf_open(p)" 388 * use the handle when calling "tprintf" 389 * when done, do a "tprintf_close" to drop the handle 390 */ 391 392 /* 393 * tprintf_open: get a tprintf handle on a process "p" 394 * XXX change s/proc/process 395 * 396 * => returns NULL if process can't be printed to 397 */ 398 399 tpr_t 400 tprintf_open(struct proc *p) 401 { 402 struct process *pr = p->p_p; 403 404 if (pr->ps_flags & PS_CONTROLT && pr->ps_session->s_ttyvp) { 405 SESSHOLD(pr->ps_session); 406 return ((tpr_t)pr->ps_session); 407 } 408 return ((tpr_t) NULL); 409 } 410 411 /* 412 * tprintf_close: dispose of a tprintf handle obtained with tprintf_open 413 */ 414 415 void 416 tprintf_close(tpr_t sess) 417 { 418 419 if (sess) 420 SESSRELE((struct session *) sess); 421 } 422 423 /* 424 * tprintf: given tprintf handle to a process [obtained with tprintf_open], 425 * send a message to the controlling tty for that process. 426 * 427 * => also sends message to /dev/klog 428 */ 429 void 430 tprintf(tpr_t tpr, const char *fmt, ...) 431 { 432 struct session *sess = (struct session *)tpr; 433 struct tty *tp = NULL; 434 int flags = TOLOG; 435 va_list ap; 436 437 logpri(LOG_INFO); 438 if (sess && sess->s_ttyvp && ttycheckoutq(sess->s_ttyp, 0)) { 439 flags |= TOTTY; 440 tp = sess->s_ttyp; 441 } 442 va_start(ap, fmt); 443 kprintf(fmt, flags, tp, NULL, ap); 444 va_end(ap); 445 logwakeup(); 446 } 447 448 #endif /* NFSSERVER || NFSCLIENT */ 449 450 451 /* 452 * ttyprintf: send a message to a specific tty 453 * 454 * => should be used only by tty driver or anything that knows the 455 * underlying tty will not be revoked(2)'d away. [otherwise, 456 * use tprintf] 457 */ 458 void 459 ttyprintf(struct tty *tp, const char *fmt, ...) 460 { 461 va_list ap; 462 463 va_start(ap, fmt); 464 kprintf(fmt, TOTTY, tp, NULL, ap); 465 va_end(ap); 466 } 467 468 #ifdef DDB 469 470 /* 471 * db_printf: printf for DDB (via db_putchar) 472 */ 473 474 int 475 db_printf(const char *fmt, ...) 476 { 477 va_list ap; 478 int flags, retval; 479 480 flags = TODDB; 481 if (db_log) 482 flags |= TOLOG; 483 va_start(ap, fmt); 484 retval = kprintf(fmt, flags, NULL, NULL, ap); 485 va_end(ap); 486 return(retval); 487 } 488 489 #endif /* DDB */ 490 491 492 /* 493 * normal kernel printf functions: printf, vprintf, snprintf 494 */ 495 496 /* 497 * printf: print a message to the console and the log 498 */ 499 int 500 printf(const char *fmt, ...) 501 { 502 va_list ap; 503 int retval; 504 505 mtx_enter(&kprintf_mutex); 506 507 va_start(ap, fmt); 508 retval = kprintf(fmt, TOCONS | TOLOG, NULL, NULL, ap); 509 va_end(ap); 510 if (!panicstr) 511 logwakeup(); 512 513 mtx_leave(&kprintf_mutex); 514 515 return(retval); 516 } 517 518 /* 519 * vprintf: print a message to the console and the log [already have a 520 * va_list] 521 */ 522 523 int 524 vprintf(const char *fmt, va_list ap) 525 { 526 int retval; 527 528 mtx_enter(&kprintf_mutex); 529 530 retval = kprintf(fmt, TOCONS | TOLOG, NULL, NULL, ap); 531 if (!panicstr) 532 logwakeup(); 533 534 mtx_leave(&kprintf_mutex); 535 536 return (retval); 537 } 538 539 /* 540 * snprintf: print a message to a buffer 541 */ 542 int 543 snprintf(char *buf, size_t size, const char *fmt, ...) 544 { 545 int retval; 546 va_list ap; 547 char *p; 548 549 p = buf + size - 1; 550 if (size < 1) 551 p = buf; 552 va_start(ap, fmt); 553 retval = kprintf(fmt, TOBUFONLY | TOCOUNT, &p, buf, ap); 554 va_end(ap); 555 if (size > 0) 556 *(p) = 0; /* null terminate */ 557 return(retval); 558 } 559 560 /* 561 * vsnprintf: print a message to a buffer [already have va_alist] 562 */ 563 int 564 vsnprintf(char *buf, size_t size, const char *fmt, va_list ap) 565 { 566 int retval; 567 char *p; 568 569 p = buf + size - 1; 570 if (size < 1) 571 p = buf; 572 retval = kprintf(fmt, TOBUFONLY | TOCOUNT, &p, buf, ap); 573 if (size > 0) 574 *(p) = 0; /* null terminate */ 575 return(retval); 576 } 577 578 /* 579 * kprintf: scaled down version of printf(3). 580 * 581 * this version based on vfprintf() from libc which was derived from 582 * software contributed to Berkeley by Chris Torek. 583 * 584 * The additional format %b is supported to decode error registers. 585 * Its usage is: 586 * 587 * printf("reg=%b\n", regval, "<base><arg>*"); 588 * 589 * where <base> is the output base expressed as a control character, e.g. 590 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters, 591 * the first of which gives the bit number to be inspected (origin 1), and 592 * the next characters (up to a control character, i.e. a character <= 32), 593 * give the name of the register. Thus: 594 * 595 * kprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n"); 596 * 597 * would produce output: 598 * 599 * reg=3<BITTWO,BITONE> 600 * 601 * To support larger integers (> 32 bits), %b formatting will also accept 602 * control characters in the region 0x80 - 0xff. 0x80 refers to bit 0, 603 * 0x81 refers to bit 1, and so on. The equivalent string to the above is: 604 * 605 * kprintf("reg=%b\n", 3, "\10\201BITTWO\200BITONE\n"); 606 * 607 * and would produce the same output. 608 * 609 * Like the rest of printf, %b can be prefixed to handle various size 610 * modifiers, eg. %b is for "int", %lb is for "long", and %llb supports 611 * "long long". 612 * 613 * This code is large and complicated... 614 */ 615 616 /* 617 * macros for converting digits to letters and vice versa 618 */ 619 #define to_digit(c) ((c) - '0') 620 #define is_digit(c) ((unsigned)to_digit(c) <= 9) 621 #define to_char(n) ((n) + '0') 622 623 /* 624 * flags used during conversion. 625 */ 626 #define ALT 0x001 /* alternate form */ 627 #define HEXPREFIX 0x002 /* add 0x or 0X prefix */ 628 #define LADJUST 0x004 /* left adjustment */ 629 #define LONGDBL 0x008 /* long double; unimplemented */ 630 #define LONGINT 0x010 /* long integer */ 631 #define QUADINT 0x020 /* quad integer */ 632 #define SHORTINT 0x040 /* short integer */ 633 #define ZEROPAD 0x080 /* zero (as opposed to blank) pad */ 634 #define FPT 0x100 /* Floating point number */ 635 #define SIZEINT 0x200 /* (signed) size_t */ 636 637 /* 638 * To extend shorts properly, we need both signed and unsigned 639 * argument extraction methods. 640 */ 641 #define SARG() \ 642 (flags&QUADINT ? va_arg(ap, quad_t) : \ 643 flags&LONGINT ? va_arg(ap, long) : \ 644 flags&SIZEINT ? va_arg(ap, ssize_t) : \ 645 flags&SHORTINT ? (long)(short)va_arg(ap, int) : \ 646 (long)va_arg(ap, int)) 647 #define UARG() \ 648 (flags&QUADINT ? va_arg(ap, u_quad_t) : \ 649 flags&LONGINT ? va_arg(ap, u_long) : \ 650 flags&SIZEINT ? va_arg(ap, size_t) : \ 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 case ' ': 766 /* 767 * ``If the space and + flags both appear, the space 768 * flag will be ignored.'' 769 * -- ANSI X3J11 770 */ 771 if (!sign) 772 sign = ' '; 773 goto rflag; 774 case '#': 775 flags |= ALT; 776 goto rflag; 777 case '*': 778 /* 779 * ``A negative field width argument is taken as a 780 * - flag followed by a positive field width.'' 781 * -- ANSI X3J11 782 * They don't exclude field widths read from args. 783 */ 784 if ((width = va_arg(ap, int)) >= 0) 785 goto rflag; 786 width = -width; 787 /* FALLTHROUGH */ 788 case '-': 789 flags |= LADJUST; 790 goto rflag; 791 case '+': 792 sign = '+'; 793 goto rflag; 794 case '.': 795 if ((ch = *fmt++) == '*') { 796 n = va_arg(ap, int); 797 prec = n < 0 ? -1 : n; 798 goto rflag; 799 } 800 n = 0; 801 while (is_digit(ch)) { 802 n = 10 * n + to_digit(ch); 803 ch = *fmt++; 804 } 805 prec = n < 0 ? -1 : n; 806 goto reswitch; 807 case '0': 808 /* 809 * ``Note that 0 is taken as a flag, not as the 810 * beginning of a field width.'' 811 * -- ANSI X3J11 812 */ 813 flags |= ZEROPAD; 814 goto rflag; 815 case '1': case '2': case '3': case '4': 816 case '5': case '6': case '7': case '8': case '9': 817 n = 0; 818 do { 819 n = 10 * n + to_digit(ch); 820 ch = *fmt++; 821 } while (is_digit(ch)); 822 width = n; 823 goto reswitch; 824 case 'h': 825 flags |= SHORTINT; 826 goto rflag; 827 case 'l': 828 if (*fmt == 'l') { 829 fmt++; 830 flags |= QUADINT; 831 } else { 832 flags |= LONGINT; 833 } 834 goto rflag; 835 case 'q': 836 flags |= QUADINT; 837 goto rflag; 838 case 'z': 839 flags |= SIZEINT; 840 goto rflag; 841 case 'c': 842 *(cp = buf) = va_arg(ap, int); 843 size = 1; 844 sign = '\0'; 845 break; 846 case 'D': 847 flags |= LONGINT; 848 /*FALLTHROUGH*/ 849 case 'd': 850 case 'i': 851 _uquad = SARG(); 852 if ((quad_t)_uquad < 0) { 853 _uquad = -_uquad; 854 sign = '-'; 855 } 856 base = DEC; 857 goto number; 858 case 'n': 859 if (flags & QUADINT) 860 *va_arg(ap, quad_t *) = ret; 861 else if (flags & LONGINT) 862 *va_arg(ap, long *) = ret; 863 else if (flags & SHORTINT) 864 *va_arg(ap, short *) = ret; 865 else if (flags & SIZEINT) 866 *va_arg(ap, ssize_t *) = ret; 867 else 868 *va_arg(ap, int *) = ret; 869 continue; /* no output */ 870 case 'O': 871 flags |= LONGINT; 872 /*FALLTHROUGH*/ 873 case 'o': 874 _uquad = UARG(); 875 base = OCT; 876 goto nosign; 877 case 'p': 878 /* 879 * ``The argument shall be a pointer to void. The 880 * value of the pointer is converted to a sequence 881 * of printable characters, in an implementation- 882 * defined manner.'' 883 * -- ANSI X3J11 884 */ 885 /* NOSTRICT */ 886 _uquad = (u_long)va_arg(ap, void *); 887 base = HEX; 888 xdigs = "0123456789abcdef"; 889 flags |= HEXPREFIX; 890 ch = 'x'; 891 goto nosign; 892 case 's': 893 if ((cp = va_arg(ap, char *)) == NULL) 894 cp = "(null)"; 895 if (prec >= 0) { 896 /* 897 * can't use strlen; can only look for the 898 * NUL in the first `prec' characters, and 899 * strlen() will go further. 900 */ 901 char *p = memchr(cp, 0, prec); 902 903 if (p != NULL) { 904 size = p - cp; 905 if (size > prec) 906 size = prec; 907 } else 908 size = prec; 909 } else 910 size = strlen(cp); 911 sign = '\0'; 912 break; 913 case 'U': 914 flags |= LONGINT; 915 /*FALLTHROUGH*/ 916 case 'u': 917 _uquad = UARG(); 918 base = DEC; 919 goto nosign; 920 case 'X': 921 xdigs = "0123456789ABCDEF"; 922 goto hex; 923 case 'x': 924 xdigs = "0123456789abcdef"; 925 hex: _uquad = UARG(); 926 base = HEX; 927 /* leading 0x/X only if non-zero */ 928 if (flags & ALT && _uquad != 0) 929 flags |= HEXPREFIX; 930 931 /* unsigned conversions */ 932 nosign: sign = '\0'; 933 /* 934 * ``... diouXx conversions ... if a precision is 935 * specified, the 0 flag will be ignored.'' 936 * -- ANSI X3J11 937 */ 938 number: if ((dprec = prec) >= 0) 939 flags &= ~ZEROPAD; 940 941 /* 942 * ``The result of converting a zero value with an 943 * explicit precision of zero is no characters.'' 944 * -- ANSI X3J11 945 */ 946 cp = buf + KPRINTF_BUFSIZE; 947 if (_uquad != 0 || prec != 0) { 948 /* 949 * Unsigned mod is hard, and unsigned mod 950 * by a constant is easier than that by 951 * a variable; hence this switch. 952 */ 953 switch (base) { 954 case OCT: 955 do { 956 *--cp = to_char(_uquad & 7); 957 _uquad >>= 3; 958 } while (_uquad); 959 /* handle octal leading 0 */ 960 if (flags & ALT && *cp != '0') 961 *--cp = '0'; 962 break; 963 964 case DEC: 965 /* many numbers are 1 digit */ 966 while (_uquad >= 10) { 967 *--cp = to_char(_uquad % 10); 968 _uquad /= 10; 969 } 970 *--cp = to_char(_uquad); 971 break; 972 973 case HEX: 974 do { 975 *--cp = xdigs[_uquad & 15]; 976 _uquad >>= 4; 977 } while (_uquad); 978 break; 979 980 default: 981 cp = "bug in kprintf: bad base"; 982 size = strlen(cp); 983 goto skipsize; 984 } 985 } 986 size = buf + KPRINTF_BUFSIZE - cp; 987 skipsize: 988 break; 989 default: /* "%?" prints ?, unless ? is NUL */ 990 if (ch == '\0') 991 goto done; 992 /* pretend it was %c with argument ch */ 993 cp = buf; 994 *cp = ch; 995 size = 1; 996 sign = '\0'; 997 break; 998 } 999 1000 /* 1001 * All reasonable formats wind up here. At this point, `cp' 1002 * points to a string which (if not flags&LADJUST) should be 1003 * padded out to `width' places. If flags&ZEROPAD, it should 1004 * first be prefixed by any sign or other prefix; otherwise, 1005 * it should be blank padded before the prefix is emitted. 1006 * After any left-hand padding and prefixing, emit zeroes 1007 * required by a decimal [diouxX] precision, then print the 1008 * string proper, then emit zeroes required by any leftover 1009 * floating precision; finally, if LADJUST, pad with blanks. 1010 * 1011 * Compute actual size, so we know how much to pad. 1012 * size excludes decimal prec; realsz includes it. 1013 */ 1014 realsz = dprec > size ? dprec : size; 1015 if (sign) 1016 realsz++; 1017 else if (flags & HEXPREFIX) 1018 realsz+= 2; 1019 1020 /* right-adjusting blank padding */ 1021 if ((flags & (LADJUST|ZEROPAD)) == 0) { 1022 n = width - realsz; 1023 while (n-- > 0) 1024 KPRINTF_PUTCHAR(' '); 1025 } 1026 1027 /* prefix */ 1028 if (sign) { 1029 KPRINTF_PUTCHAR(sign); 1030 } else if (flags & HEXPREFIX) { 1031 KPRINTF_PUTCHAR('0'); 1032 KPRINTF_PUTCHAR(ch); 1033 } 1034 1035 /* right-adjusting zero padding */ 1036 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) { 1037 n = width - realsz; 1038 while (n-- > 0) 1039 KPRINTF_PUTCHAR('0'); 1040 } 1041 1042 /* leading zeroes from decimal precision */ 1043 n = dprec - size; 1044 while (n-- > 0) 1045 KPRINTF_PUTCHAR('0'); 1046 1047 /* the string or number proper */ 1048 while (size--) 1049 KPRINTF_PUTCHAR(*cp++); 1050 /* left-adjusting padding (always blank) */ 1051 if (flags & LADJUST) { 1052 n = width - realsz; 1053 while (n-- > 0) 1054 KPRINTF_PUTCHAR(' '); 1055 } 1056 } 1057 1058 done: 1059 if ((oflags & TOBUFONLY) && (vp != NULL)) 1060 *(char **)vp = sbuf; 1061 overflow: 1062 return (ret); 1063 /* NOTREACHED */ 1064 } 1065 1066 #if __GNUC_PREREQ__(2,96) 1067 /* 1068 * XXX - these functions shouldn't be in the kernel, but gcc 3.X feels like 1069 * translating some printf calls to puts and since it doesn't seem 1070 * possible to just turn off parts of those optimizations (some of 1071 * them are really useful), we have to provide a dummy puts and putchar 1072 * that are wrappers around printf. 1073 */ 1074 int puts(const char *); 1075 int putchar(int c); 1076 1077 int 1078 puts(const char *str) 1079 { 1080 printf("%s\n", str); 1081 1082 return (0); 1083 } 1084 1085 int 1086 putchar(int c) 1087 { 1088 printf("%c", c); 1089 1090 return (c); 1091 } 1092 1093 1094 #endif 1095