1 /* $OpenBSD: subr_prf.c,v 1.58 2004/01/03 14:08:53 espie 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 56 #include <dev/cons.h> 57 58 /* 59 * note that stdarg.h and the ansi style va_start macro is used for both 60 * ansi and traditional c compilers. 61 */ 62 #include <sys/stdarg.h> 63 64 #ifdef KGDB 65 #include <sys/kgdb.h> 66 #include <machine/cpu.h> 67 #endif 68 #ifdef DDB 69 #include <ddb/db_output.h> /* db_printf, db_putchar prototypes */ 70 extern int db_radix; /* XXX: for non-standard '%r' format */ 71 #endif 72 #if defined(UVM_SWAP_ENCRYPT) 73 extern int uvm_doswapencrypt; 74 #endif 75 76 77 /* 78 * defines 79 */ 80 81 /* flags for kprintf */ 82 #define TOCONS 0x01 /* to the console */ 83 #define TOTTY 0x02 /* to the process' tty */ 84 #define TOLOG 0x04 /* to the kernel message buffer */ 85 #define TOBUFONLY 0x08 /* to the buffer (only) [for sprintf] */ 86 #define TODDB 0x10 /* to ddb console */ 87 #define TOCOUNT 0x20 /* act like [v]snprintf */ 88 89 /* max size buffer kprintf needs to print quad_t [size in base 8 + \0] */ 90 #define KPRINTF_BUFSIZE (sizeof(quad_t) * NBBY / 3 + 2) 91 92 93 /* 94 * local prototypes 95 */ 96 97 int kprintf(const char *, int, void *, char *, va_list); 98 void kputchar(int, int, struct tty *); 99 100 /* 101 * globals 102 */ 103 104 extern struct tty *constty; /* pointer to console "window" tty */ 105 int consintr = 1; /* ok to handle console interrupts? */ 106 extern int log_open; /* subr_log: is /dev/klog open? */ 107 const char *panicstr; /* arg to first call to panic (used as a flag 108 to indicate that panic has already been called). */ 109 #ifdef DDB 110 /* 111 * Enter ddb on panic. 112 */ 113 int db_panic = 1; 114 115 /* 116 * db_console controls if we can be able to enter ddb by a special key 117 * combination (machine dependent). 118 * If DDB_SAFE_CONSOLE is defined in the kernel configuration it allows 119 * to break into console during boot. It's _really_ useful when debugging 120 * some things in the kernel that can cause init(8) to crash. 121 */ 122 #ifdef DDB_SAFE_CONSOLE 123 int db_console = 1; 124 #else 125 int db_console = 0; 126 #endif 127 #endif 128 129 /* 130 * panic on spl assertion failure? 131 */ 132 int splassert_ctl = 0; 133 134 /* 135 * v_putc: routine to putc on virtual console 136 * 137 * the v_putc pointer can be used to redirect the console cnputc elsewhere 138 * [e.g. to a "virtual console"]. 139 */ 140 141 void (*v_putc)(int) = cnputc; /* start with cnputc (normal cons) */ 142 143 144 /* 145 * functions 146 */ 147 148 /* 149 * Partial support (the failure case) of the assertion facility 150 * commonly found in userland. 151 */ 152 void 153 __assert(t, f, l, e) 154 const char *t, *f, *e; 155 int l; 156 { 157 158 panic("kernel %sassertion \"%s\" failed: file \"%s\", line %d", 159 t, e, f, l); 160 } 161 162 /* 163 * tablefull: warn that a system table is full 164 */ 165 166 void 167 tablefull(tab) 168 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 struct msgbuf *mbp; 336 337 if (panicstr) 338 constty = NULL; 339 if ((flags & TOCONS) && tp == NULL && constty) { 340 tp = constty; 341 flags |= TOTTY; 342 } 343 if ((flags & TOTTY) && tp && tputchar(c, tp) < 0 && 344 (flags & TOCONS) && tp == constty) 345 constty = NULL; 346 if ((flags & TOLOG) && 347 c != '\0' && c != '\r' && c != 0177 && msgbufmapped) { 348 mbp = msgbufp; 349 if (mbp->msg_magic != MSG_MAGIC) { 350 /* Nothing we can do */ 351 } 352 mbp->msg_bufc[mbp->msg_bufx++] = c; 353 mbp->msg_bufl = min(mbp->msg_bufl+1, mbp->msg_bufs); 354 if (mbp->msg_bufx < 0 || mbp->msg_bufx >= mbp->msg_bufs) 355 mbp->msg_bufx = 0; 356 /* If the buffer is full, keep the most recent data. */ 357 if (mbp->msg_bufr == mbp->msg_bufx) { 358 if (++mbp->msg_bufr >= mbp->msg_bufs) 359 mbp->msg_bufr = 0; 360 } 361 } 362 if ((flags & TOCONS) && constty == NULL && c != '\0') 363 (*v_putc)(c); 364 #ifdef DDB 365 if (flags & TODDB) 366 db_putchar(c); 367 #endif 368 } 369 370 371 /* 372 * uprintf: print to the controlling tty of the current process 373 * 374 * => we may block if the tty queue is full 375 * => no message is printed if the queue doesn't clear in a reasonable 376 * time 377 */ 378 379 void 380 uprintf(const char *fmt, ...) 381 { 382 struct proc *p = curproc; 383 va_list ap; 384 385 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) { 386 va_start(ap, fmt); 387 kprintf(fmt, TOTTY, p->p_session->s_ttyp, NULL, ap); 388 va_end(ap); 389 } 390 } 391 392 /* 393 * tprintf functions: used to send messages to a specific process 394 * 395 * usage: 396 * get a tpr_t handle on a process "p" by using "tprintf_open(p)" 397 * use the handle when calling "tprintf" 398 * when done, do a "tprintf_close" to drop the handle 399 */ 400 401 /* 402 * tprintf_open: get a tprintf handle on a process "p" 403 * 404 * => returns NULL if process can't be printed to 405 */ 406 407 tpr_t 408 tprintf_open(struct proc *p) 409 { 410 411 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) { 412 SESSHOLD(p->p_session); 413 return ((tpr_t) p->p_session); 414 } 415 return ((tpr_t) NULL); 416 } 417 418 /* 419 * tprintf_close: dispose of a tprintf handle obtained with tprintf_open 420 */ 421 422 void 423 tprintf_close(tpr_t sess) 424 { 425 426 if (sess) 427 SESSRELE((struct session *) sess); 428 } 429 430 /* 431 * tprintf: given tprintf handle to a process [obtained with tprintf_open], 432 * send a message to the controlling tty for that process. 433 * 434 * => also sends message to /dev/klog 435 */ 436 void 437 tprintf(tpr_t tpr, const char *fmt, ...) 438 { 439 struct session *sess = (struct session *)tpr; 440 struct tty *tp = NULL; 441 int flags = TOLOG; 442 va_list ap; 443 444 logpri(LOG_INFO); 445 if (sess && sess->s_ttyvp && ttycheckoutq(sess->s_ttyp, 0)) { 446 flags |= TOTTY; 447 tp = sess->s_ttyp; 448 } 449 va_start(ap, fmt); 450 kprintf(fmt, flags, tp, NULL, ap); 451 va_end(ap); 452 logwakeup(); 453 } 454 455 456 /* 457 * ttyprintf: send a message to a specific tty 458 * 459 * => should be used only by tty driver or anything that knows the 460 * underlying tty will not be revoked(2)'d away. [otherwise, 461 * use tprintf] 462 */ 463 void 464 ttyprintf(struct tty *tp, const char *fmt, ...) 465 { 466 va_list ap; 467 468 va_start(ap, fmt); 469 kprintf(fmt, TOTTY, tp, NULL, ap); 470 va_end(ap); 471 } 472 473 #ifdef DDB 474 475 /* 476 * db_printf: printf for DDB (via db_putchar) 477 */ 478 479 int 480 db_printf(const char *fmt, ...) 481 { 482 va_list ap; 483 int flags, retval; 484 485 flags = TODDB; 486 if (db_log) 487 flags |= TOLOG; 488 va_start(ap, fmt); 489 retval = kprintf(fmt, flags, NULL, NULL, ap); 490 va_end(ap); 491 return(retval); 492 } 493 494 #endif /* DDB */ 495 496 497 /* 498 * normal kernel printf functions: printf, vprintf, sprintf 499 */ 500 501 /* 502 * printf: print a message to the console and the log 503 */ 504 int 505 printf(const char *fmt, ...) 506 { 507 va_list ap; 508 int savintr, retval; 509 510 savintr = consintr; /* disable interrupts */ 511 consintr = 0; 512 va_start(ap, fmt); 513 retval = kprintf(fmt, TOCONS | TOLOG, NULL, NULL, ap); 514 va_end(ap); 515 if (!panicstr) 516 logwakeup(); 517 consintr = savintr; /* reenable interrupts */ 518 return(retval); 519 } 520 521 /* 522 * vprintf: print a message to the console and the log [already have a 523 * va_list] 524 */ 525 526 int 527 vprintf(const char *fmt, va_list ap) 528 { 529 int savintr, retval; 530 531 savintr = consintr; /* disable interrupts */ 532 consintr = 0; 533 retval = kprintf(fmt, TOCONS | TOLOG, NULL, NULL, ap); 534 if (!panicstr) 535 logwakeup(); 536 consintr = savintr; /* reenable interrupts */ 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 * This code is large and complicated... 605 */ 606 607 /* 608 * macros for converting digits to letters and vice versa 609 */ 610 #define to_digit(c) ((c) - '0') 611 #define is_digit(c) ((unsigned)to_digit(c) <= 9) 612 #define to_char(n) ((n) + '0') 613 614 /* 615 * flags used during conversion. 616 */ 617 #define ALT 0x001 /* alternate form */ 618 #define HEXPREFIX 0x002 /* add 0x or 0X prefix */ 619 #define LADJUST 0x004 /* left adjustment */ 620 #define LONGDBL 0x008 /* long double; unimplemented */ 621 #define LONGINT 0x010 /* long integer */ 622 #define QUADINT 0x020 /* quad integer */ 623 #define SHORTINT 0x040 /* short integer */ 624 #define ZEROPAD 0x080 /* zero (as opposed to blank) pad */ 625 #define FPT 0x100 /* Floating point number */ 626 627 /* 628 * To extend shorts properly, we need both signed and unsigned 629 * argument extraction methods. 630 */ 631 #define SARG() \ 632 (flags&QUADINT ? va_arg(ap, quad_t) : \ 633 flags&LONGINT ? va_arg(ap, long) : \ 634 flags&SHORTINT ? (long)(short)va_arg(ap, int) : \ 635 (long)va_arg(ap, int)) 636 #define UARG() \ 637 (flags&QUADINT ? va_arg(ap, u_quad_t) : \ 638 flags&LONGINT ? va_arg(ap, u_long) : \ 639 flags&SHORTINT ? (u_long)(u_short)va_arg(ap, int) : \ 640 (u_long)va_arg(ap, u_int)) 641 642 #define KPRINTF_PUTCHAR(C) do { \ 643 int chr = (C); \ 644 ret += 1; \ 645 if (oflags & TOBUFONLY) { \ 646 if ((vp != NULL) && (sbuf == tailp)) { \ 647 if (!(oflags & TOCOUNT)) \ 648 goto overflow; \ 649 } else \ 650 *sbuf++ = chr; \ 651 } else { \ 652 kputchar(chr, oflags, (struct tty *)vp); \ 653 } \ 654 } while(0) 655 656 int 657 kprintf(const char *fmt0, int oflags, void *vp, char *sbuf, va_list ap) 658 { 659 char *fmt; /* format string */ 660 int ch; /* character from fmt */ 661 int n; /* handy integer (short term usage) */ 662 char *cp = NULL; /* handy char pointer (short term usage) */ 663 int flags; /* flags as above */ 664 int ret; /* return value accumulator */ 665 int width; /* width from format (%8d), or 0 */ 666 int prec; /* precision from format (%.3d), or -1 */ 667 char sign; /* sign prefix (' ', '+', '-', or \0) */ 668 669 u_quad_t _uquad; /* integer arguments %[diouxX] */ 670 enum { OCT, DEC, HEX } base;/* base for [diouxX] conversion */ 671 int dprec; /* a copy of prec if [diouxX], 0 otherwise */ 672 int realsz; /* field size expanded by dprec */ 673 int size = 0; /* size of converted field or string */ 674 char *xdigs = NULL; /* digits for [xX] conversion */ 675 char buf[KPRINTF_BUFSIZE]; /* space for %c, %[diouxX] */ 676 char *tailp = NULL; /* tail pointer for snprintf */ 677 678 if ((oflags & TOBUFONLY) && (vp != NULL)) 679 tailp = *(char **)vp; 680 681 fmt = (char *)fmt0; 682 ret = 0; 683 684 /* 685 * Scan the format for conversions (`%' character). 686 */ 687 for (;;) { 688 while (*fmt != '%' && *fmt) { 689 KPRINTF_PUTCHAR(*fmt++); 690 } 691 if (*fmt == 0) 692 goto done; 693 694 fmt++; /* skip over '%' */ 695 696 flags = 0; 697 dprec = 0; 698 width = 0; 699 prec = -1; 700 sign = '\0'; 701 702 rflag: ch = *fmt++; 703 reswitch: switch (ch) { 704 /* XXX: non-standard '%b' format */ 705 case 'b': { 706 char *b, *z; 707 int tmp; 708 _uquad = va_arg(ap, u_int); 709 b = va_arg(ap, char *); 710 if (*b == 8) 711 snprintf(buf, sizeof buf, "%llo", _uquad); 712 else if (*b == 10) 713 snprintf(buf, sizeof buf, "%lld", _uquad); 714 else if (*b == 16) 715 snprintf(buf, sizeof buf, "%llx", _uquad); 716 else 717 break; 718 b++; 719 720 z = buf; 721 while (*z) { 722 KPRINTF_PUTCHAR(*z++); 723 } 724 725 if (_uquad) { 726 tmp = 0; 727 while ((n = *b++) != 0) { 728 if (_uquad & (1 << (n - 1))) { 729 KPRINTF_PUTCHAR(tmp ? ',':'<'); 730 while ((n = *b) > ' ') { 731 KPRINTF_PUTCHAR(n); 732 b++; 733 } 734 tmp = 1; 735 } else { 736 while(*b > ' ') 737 b++; 738 } 739 } 740 if (tmp) { 741 KPRINTF_PUTCHAR('>'); 742 } 743 } 744 continue; /* no output */ 745 } 746 747 #ifdef DDB 748 /* XXX: non-standard '%r' format (print int in db_radix) */ 749 case 'r': 750 if ((oflags & TODDB) == 0) 751 goto default_case; 752 753 if (db_radix == 16) 754 goto case_z; /* signed hex */ 755 _uquad = SARG(); 756 if ((quad_t)_uquad < 0) { 757 _uquad = -_uquad; 758 sign = '-'; 759 } 760 base = (db_radix == 8) ? OCT : DEC; 761 goto number; 762 763 764 /* XXX: non-standard '%z' format ("signed hex", a "hex %i")*/ 765 case 'z': 766 case_z: 767 if ((oflags & TODDB) == 0) 768 goto default_case; 769 770 xdigs = "0123456789abcdef"; 771 ch = 'x'; /* the 'x' in '0x' (below) */ 772 _uquad = SARG(); 773 base = HEX; 774 /* leading 0x/X only if non-zero */ 775 if (flags & ALT && _uquad != 0) 776 flags |= HEXPREFIX; 777 if ((quad_t)_uquad < 0) { 778 _uquad = -_uquad; 779 sign = '-'; 780 } 781 goto number; 782 #endif 783 784 case ' ': 785 /* 786 * ``If the space and + flags both appear, the space 787 * flag will be ignored.'' 788 * -- ANSI X3J11 789 */ 790 if (!sign) 791 sign = ' '; 792 goto rflag; 793 case '#': 794 flags |= ALT; 795 goto rflag; 796 case '*': 797 /* 798 * ``A negative field width argument is taken as a 799 * - flag followed by a positive field width.'' 800 * -- ANSI X3J11 801 * They don't exclude field widths read from args. 802 */ 803 if ((width = va_arg(ap, int)) >= 0) 804 goto rflag; 805 width = -width; 806 /* FALLTHROUGH */ 807 case '-': 808 flags |= LADJUST; 809 goto rflag; 810 case '+': 811 sign = '+'; 812 goto rflag; 813 case '.': 814 if ((ch = *fmt++) == '*') { 815 n = va_arg(ap, int); 816 prec = n < 0 ? -1 : n; 817 goto rflag; 818 } 819 n = 0; 820 while (is_digit(ch)) { 821 n = 10 * n + to_digit(ch); 822 ch = *fmt++; 823 } 824 prec = n < 0 ? -1 : n; 825 goto reswitch; 826 case '0': 827 /* 828 * ``Note that 0 is taken as a flag, not as the 829 * beginning of a field width.'' 830 * -- ANSI X3J11 831 */ 832 flags |= ZEROPAD; 833 goto rflag; 834 case '1': case '2': case '3': case '4': 835 case '5': case '6': case '7': case '8': case '9': 836 n = 0; 837 do { 838 n = 10 * n + to_digit(ch); 839 ch = *fmt++; 840 } while (is_digit(ch)); 841 width = n; 842 goto reswitch; 843 case 'h': 844 flags |= SHORTINT; 845 goto rflag; 846 case 'l': 847 if (*fmt == 'l') { 848 fmt++; 849 flags |= QUADINT; 850 } else { 851 flags |= LONGINT; 852 } 853 goto rflag; 854 case 'q': 855 flags |= QUADINT; 856 goto rflag; 857 case 'c': 858 *(cp = buf) = va_arg(ap, int); 859 size = 1; 860 sign = '\0'; 861 break; 862 case 'D': 863 flags |= LONGINT; 864 /*FALLTHROUGH*/ 865 case 'd': 866 case 'i': 867 _uquad = SARG(); 868 if ((quad_t)_uquad < 0) { 869 _uquad = -_uquad; 870 sign = '-'; 871 } 872 base = DEC; 873 goto number; 874 case 'n': 875 #ifdef DDB 876 /* XXX: non-standard '%n' format */ 877 /* 878 * XXX: HACK! DDB wants '%n' to be a '%u' printed 879 * in db_radix format. this should die since '%n' 880 * is already defined in standard printf to write 881 * the number of chars printed so far to the arg (which 882 * should be a pointer. 883 */ 884 if (oflags & TODDB) { 885 if (db_radix == 16) 886 ch = 'x'; /* convert to %x */ 887 else if (db_radix == 8) 888 ch = 'o'; /* convert to %o */ 889 else 890 ch = 'u'; /* convert to %u */ 891 892 /* ... and start again */ 893 goto reswitch; 894 } 895 896 #endif 897 if (flags & QUADINT) 898 *va_arg(ap, quad_t *) = ret; 899 else if (flags & LONGINT) 900 *va_arg(ap, long *) = ret; 901 else if (flags & SHORTINT) 902 *va_arg(ap, short *) = ret; 903 else 904 *va_arg(ap, int *) = ret; 905 continue; /* no output */ 906 case 'O': 907 flags |= LONGINT; 908 /*FALLTHROUGH*/ 909 case 'o': 910 _uquad = UARG(); 911 base = OCT; 912 goto nosign; 913 case 'p': 914 /* 915 * ``The argument shall be a pointer to void. The 916 * value of the pointer is converted to a sequence 917 * of printable characters, in an implementation- 918 * defined manner.'' 919 * -- ANSI X3J11 920 */ 921 /* NOSTRICT */ 922 _uquad = (u_long)va_arg(ap, void *); 923 base = HEX; 924 xdigs = "0123456789abcdef"; 925 flags |= HEXPREFIX; 926 ch = 'x'; 927 goto nosign; 928 case 's': 929 if ((cp = va_arg(ap, char *)) == NULL) 930 cp = "(null)"; 931 if (prec >= 0) { 932 /* 933 * can't use strlen; can only look for the 934 * NUL in the first `prec' characters, and 935 * strlen() will go further. 936 */ 937 char *p = memchr(cp, 0, prec); 938 939 if (p != NULL) { 940 size = p - cp; 941 if (size > prec) 942 size = prec; 943 } else 944 size = prec; 945 } else 946 size = strlen(cp); 947 sign = '\0'; 948 break; 949 case 'U': 950 flags |= LONGINT; 951 /*FALLTHROUGH*/ 952 case 'u': 953 _uquad = UARG(); 954 base = DEC; 955 goto nosign; 956 case 'X': 957 xdigs = "0123456789ABCDEF"; 958 goto hex; 959 case 'x': 960 xdigs = "0123456789abcdef"; 961 hex: _uquad = UARG(); 962 base = HEX; 963 /* leading 0x/X only if non-zero */ 964 if (flags & ALT && _uquad != 0) 965 flags |= HEXPREFIX; 966 967 /* unsigned conversions */ 968 nosign: sign = '\0'; 969 /* 970 * ``... diouXx conversions ... if a precision is 971 * specified, the 0 flag will be ignored.'' 972 * -- ANSI X3J11 973 */ 974 number: if ((dprec = prec) >= 0) 975 flags &= ~ZEROPAD; 976 977 /* 978 * ``The result of converting a zero value with an 979 * explicit precision of zero is no characters.'' 980 * -- ANSI X3J11 981 */ 982 cp = buf + KPRINTF_BUFSIZE; 983 if (_uquad != 0 || prec != 0) { 984 /* 985 * Unsigned mod is hard, and unsigned mod 986 * by a constant is easier than that by 987 * a variable; hence this switch. 988 */ 989 switch (base) { 990 case OCT: 991 do { 992 *--cp = to_char(_uquad & 7); 993 _uquad >>= 3; 994 } while (_uquad); 995 /* handle octal leading 0 */ 996 if (flags & ALT && *cp != '0') 997 *--cp = '0'; 998 break; 999 1000 case DEC: 1001 /* many numbers are 1 digit */ 1002 while (_uquad >= 10) { 1003 *--cp = to_char(_uquad % 10); 1004 _uquad /= 10; 1005 } 1006 *--cp = to_char(_uquad); 1007 break; 1008 1009 case HEX: 1010 do { 1011 *--cp = xdigs[_uquad & 15]; 1012 _uquad >>= 4; 1013 } while (_uquad); 1014 break; 1015 1016 default: 1017 cp = "bug in kprintf: bad base"; 1018 size = strlen(cp); 1019 goto skipsize; 1020 } 1021 } 1022 size = buf + KPRINTF_BUFSIZE - cp; 1023 skipsize: 1024 break; 1025 default: /* "%?" prints ?, unless ? is NUL */ 1026 #ifdef DDB 1027 default_case: /* DDB */ 1028 #endif 1029 if (ch == '\0') 1030 goto done; 1031 /* pretend it was %c with argument ch */ 1032 cp = buf; 1033 *cp = ch; 1034 size = 1; 1035 sign = '\0'; 1036 break; 1037 } 1038 1039 /* 1040 * All reasonable formats wind up here. At this point, `cp' 1041 * points to a string which (if not flags&LADJUST) should be 1042 * padded out to `width' places. If flags&ZEROPAD, it should 1043 * first be prefixed by any sign or other prefix; otherwise, 1044 * it should be blank padded before the prefix is emitted. 1045 * After any left-hand padding and prefixing, emit zeroes 1046 * required by a decimal [diouxX] precision, then print the 1047 * string proper, then emit zeroes required by any leftover 1048 * floating precision; finally, if LADJUST, pad with blanks. 1049 * 1050 * Compute actual size, so we know how much to pad. 1051 * size excludes decimal prec; realsz includes it. 1052 */ 1053 realsz = dprec > size ? dprec : size; 1054 if (sign) 1055 realsz++; 1056 else if (flags & HEXPREFIX) 1057 realsz+= 2; 1058 1059 /* right-adjusting blank padding */ 1060 if ((flags & (LADJUST|ZEROPAD)) == 0) { 1061 n = width - realsz; 1062 while (n-- > 0) 1063 KPRINTF_PUTCHAR(' '); 1064 } 1065 1066 /* prefix */ 1067 if (sign) { 1068 KPRINTF_PUTCHAR(sign); 1069 } else if (flags & HEXPREFIX) { 1070 KPRINTF_PUTCHAR('0'); 1071 KPRINTF_PUTCHAR(ch); 1072 } 1073 1074 /* right-adjusting zero padding */ 1075 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) { 1076 n = width - realsz; 1077 while (n-- > 0) 1078 KPRINTF_PUTCHAR('0'); 1079 } 1080 1081 /* leading zeroes from decimal precision */ 1082 n = dprec - size; 1083 while (n-- > 0) 1084 KPRINTF_PUTCHAR('0'); 1085 1086 /* the string or number proper */ 1087 while (size--) 1088 KPRINTF_PUTCHAR(*cp++); 1089 /* left-adjusting padding (always blank) */ 1090 if (flags & LADJUST) { 1091 n = width - realsz; 1092 while (n-- > 0) 1093 KPRINTF_PUTCHAR(' '); 1094 } 1095 } 1096 1097 done: 1098 if ((oflags & TOBUFONLY) && (vp != NULL)) 1099 *(char **)vp = sbuf; 1100 overflow: 1101 return (ret); 1102 /* NOTREACHED */ 1103 } 1104 1105 #if __GNUC_PREREQ__(2,96) 1106 /* 1107 * XXX - these functions shouldn't be in the kernel, but gcc 3.X feels like 1108 * translating some printf calls to puts and since it doesn't seem 1109 * possible to just turn off parts of those optimizations (some of 1110 * them are really useful, we have to provide a dummy puts and putchar 1111 * that are wrappers around printf. 1112 */ 1113 int puts(const char *); 1114 int putchar(int c); 1115 1116 int 1117 puts(const char *str) 1118 { 1119 printf("%s\n", str); 1120 1121 return (0); 1122 } 1123 1124 int 1125 putchar(int c) 1126 { 1127 printf("%c", c); 1128 1129 return (c); 1130 } 1131 1132 1133 #endif 1134