subr_prf.c revision 1.24
1 /* $NetBSD: subr_prf.c,v 1.24 1996/03/30 22:25:18 christos 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. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)subr_prf.c 8.3 (Berkeley) 1/21/94 41 */ 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/buf.h> 46 #include <sys/conf.h> 47 #include <sys/reboot.h> 48 #include <sys/msgbuf.h> 49 #include <sys/proc.h> 50 #include <sys/ioctl.h> 51 #include <sys/vnode.h> 52 #include <sys/file.h> 53 #include <sys/tty.h> 54 #include <sys/tprintf.h> 55 #include <sys/syslog.h> 56 #include <sys/malloc.h> 57 #include <sys/cpu.h> 58 59 #include <dev/cons.h> 60 61 /* 62 * Note that stdarg.h and the ANSI style va_start macro is used for both 63 * ANSI and traditional C compilers. 64 */ 65 #include <machine/stdarg.h> 66 67 #ifdef KADB 68 #include <machine/kdbparam.h> 69 #endif 70 #ifdef KGDB 71 #include <machine/cpu.h> 72 #endif 73 74 #define TOCONS 0x01 75 #define TOTTY 0x02 76 #define TOLOG 0x04 77 78 struct tty *constty; /* pointer to console "window" tty */ 79 80 void (*v_putc) __P((int)) = cnputc; /* routine to putc on virtual console */ 81 82 static void putchar __P((int, int, struct tty *)); 83 static char *ksprintn __P((u_long, int, int *)); 84 void kprintf __P((const char *, int, struct tty *, va_list)); 85 86 int consintr = 1; /* Ok to handle console interrupts? */ 87 88 /* 89 * Variable panicstr contains argument to first call to panic; used as flag 90 * to indicate that the kernel has already called panic. 91 */ 92 const char *panicstr; 93 94 /* 95 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 96 * and then reboots. If we are called twice, then we avoid trying to sync 97 * the disks as this often leads to recursive panics. 98 */ 99 void 100 #ifdef __STDC__ 101 panic(const char *fmt, ...) 102 #else 103 panic(fmt, va_alist) 104 char *fmt; 105 va_dcl 106 #endif 107 { 108 int bootopt; 109 va_list ap; 110 111 bootopt = RB_AUTOBOOT | RB_DUMP; 112 if (panicstr) 113 bootopt |= RB_NOSYNC; 114 else 115 panicstr = fmt; 116 117 va_start(ap, fmt); 118 printf("panic: %:\n", fmt, ap); 119 va_end(ap); 120 121 #ifdef KGDB 122 kgdb_panic(); 123 #endif 124 #ifdef KADB 125 if (boothowto & RB_KDB) 126 kdbpanic(); 127 #endif 128 #ifdef DDB 129 Debugger(); 130 #endif 131 boot(bootopt); 132 } 133 134 /* 135 * Warn that a system table is full. 136 */ 137 void 138 tablefull(tab) 139 const char *tab; 140 { 141 142 log(LOG_ERR, "%s: table is full\n", tab); 143 } 144 145 /* 146 * Uprintf prints to the controlling terminal for the current process. 147 * It may block if the tty queue is overfull. No message is printed if 148 * the queue does not clear in a reasonable time. 149 */ 150 void 151 #ifdef __STDC__ 152 uprintf(const char *fmt, ...) 153 #else 154 uprintf(fmt, va_alist) 155 char *fmt; 156 va_dcl 157 #endif 158 { 159 register struct proc *p = curproc; 160 va_list ap; 161 162 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) { 163 va_start(ap, fmt); 164 kprintf(fmt, TOTTY, p->p_session->s_ttyp, ap); 165 va_end(ap); 166 } 167 } 168 169 tpr_t 170 tprintf_open(p) 171 register struct proc *p; 172 { 173 174 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) { 175 SESSHOLD(p->p_session); 176 return ((tpr_t) p->p_session); 177 } 178 return ((tpr_t) NULL); 179 } 180 181 void 182 tprintf_close(sess) 183 tpr_t sess; 184 { 185 186 if (sess) 187 SESSRELE((struct session *) sess); 188 } 189 190 /* 191 * tprintf prints on the controlling terminal associated 192 * with the given session. 193 */ 194 void 195 #ifdef __STDC__ 196 tprintf(tpr_t tpr, const char *fmt, ...) 197 #else 198 tprintf(tpr, fmt, va_alist) 199 tpr_t tpr; 200 char *fmt; 201 va_dcl 202 #endif 203 { 204 register struct session *sess = (struct session *)tpr; 205 struct tty *tp = NULL; 206 int flags = TOLOG; 207 va_list ap; 208 209 logpri(LOG_INFO); 210 if (sess && sess->s_ttyvp && ttycheckoutq(sess->s_ttyp, 0)) { 211 flags |= TOTTY; 212 tp = sess->s_ttyp; 213 } 214 va_start(ap, fmt); 215 kprintf(fmt, flags, tp, ap); 216 va_end(ap); 217 logwakeup(); 218 } 219 220 /* 221 * Ttyprintf displays a message on a tty; it should be used only by 222 * the tty driver, or anything that knows the underlying tty will not 223 * be revoke(2)'d away. Other callers should use tprintf. 224 */ 225 void 226 #ifdef __STDC__ 227 ttyprintf(struct tty *tp, const char *fmt, ...) 228 #else 229 ttyprintf(tp, fmt, va_alist) 230 struct tty *tp; 231 char *fmt; 232 va_dcl 233 #endif 234 { 235 va_list ap; 236 237 va_start(ap, fmt); 238 kprintf(fmt, TOTTY, tp, ap); 239 va_end(ap); 240 } 241 242 extern int log_open; 243 244 /* 245 * Log writes to the log buffer, and guarantees not to sleep (so can be 246 * called by interrupt routines). If there is no process reading the 247 * log yet, it writes to the console also. 248 */ 249 void 250 #ifdef __STDC__ 251 log(int level, const char *fmt, ...) 252 #else 253 log(level, fmt, va_alist) 254 int level; 255 char *fmt; 256 va_dcl 257 #endif 258 { 259 register int s; 260 va_list ap; 261 262 s = splhigh(); 263 logpri(level); 264 va_start(ap, fmt); 265 kprintf(fmt, TOLOG, NULL, ap); 266 splx(s); 267 va_end(ap); 268 if (!log_open) { 269 va_start(ap, fmt); 270 kprintf(fmt, TOCONS, NULL, ap); 271 va_end(ap); 272 } 273 logwakeup(); 274 } 275 276 void 277 logpri(level) 278 int level; 279 { 280 register int ch; 281 register char *p; 282 283 putchar('<', TOLOG, NULL); 284 for (p = ksprintn((u_long)level, 10, NULL); (ch = *p--) != 0;) 285 putchar(ch, TOLOG, NULL); 286 putchar('>', TOLOG, NULL); 287 } 288 289 void 290 #ifdef __STDC__ 291 addlog(const char *fmt, ...) 292 #else 293 addlog(fmt, va_alist) 294 char *fmt; 295 va_dcl 296 #endif 297 { 298 register int s; 299 va_list ap; 300 301 s = splhigh(); 302 va_start(ap, fmt); 303 kprintf(fmt, TOLOG, NULL, ap); 304 splx(s); 305 va_end(ap); 306 if (!log_open) { 307 va_start(ap, fmt); 308 kprintf(fmt, TOCONS, NULL, ap); 309 va_end(ap); 310 } 311 logwakeup(); 312 } 313 314 void 315 #ifdef __STDC__ 316 printf(const char *fmt, ...) 317 #else 318 printf(fmt, va_alist) 319 char *fmt; 320 va_dcl 321 #endif 322 { 323 va_list ap; 324 register int savintr; 325 326 savintr = consintr; /* disable interrupts */ 327 consintr = 0; 328 va_start(ap, fmt); 329 kprintf(fmt, TOCONS | TOLOG, NULL, ap); 330 va_end(ap); 331 if (!panicstr) 332 logwakeup(); 333 consintr = savintr; /* reenable interrupts */ 334 } 335 336 /* 337 * Scaled down version of printf(3). 338 * 339 * Two additional formats: 340 * 341 * The format %b is supported to decode error registers. 342 * Its usage is: 343 * 344 * printf("reg=%b\n", regval, "<base><arg>*"); 345 * 346 * where <base> is the output base expressed as a control character, e.g. 347 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters, 348 * the first of which gives the bit number to be inspected (origin 1), and 349 * the next characters (up to a control character, i.e. a character <= 32), 350 * give the name of the register. Thus: 351 * 352 * kprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n"); 353 * 354 * would produce output: 355 * 356 * reg=3<BITTWO,BITONE> 357 * 358 * The format %: passes an additional format string and argument list 359 * recursively. Its usage is: 360 * 361 * fn(char *fmt, ...) 362 * { 363 * va_list ap; 364 * va_start(ap, fmt); 365 * printf("prefix: %: suffix\n", fmt, ap); 366 * va_end(ap); 367 * } 368 * 369 * Space or zero padding and a field width are supported for the numeric 370 * formats only. 371 */ 372 void 373 kprintf(fmt, flags, tp, ap) 374 register const char *fmt; 375 int flags; 376 struct tty *tp; 377 va_list ap; 378 { 379 register char *p, *q; 380 register int ch, n; 381 u_long ul; 382 int base, lflag, tmp, width; 383 char padc; 384 385 for (;;) { 386 padc = ' '; 387 width = 0; 388 while ((ch = *(u_char *)fmt++) != '%') { 389 if (ch == '\0') 390 return; 391 putchar(ch, flags, tp); 392 } 393 lflag = 0; 394 reswitch: switch (ch = *(u_char *)fmt++) { 395 case '0': 396 padc = '0'; 397 goto reswitch; 398 case '1': case '2': case '3': case '4': 399 case '5': case '6': case '7': case '8': case '9': 400 for (width = 0;; ++fmt) { 401 width = width * 10 + ch - '0'; 402 ch = *fmt; 403 if (ch < '0' || ch > '9') 404 break; 405 } 406 goto reswitch; 407 case 'l': 408 lflag = 1; 409 goto reswitch; 410 case 'b': 411 ul = va_arg(ap, int); 412 p = va_arg(ap, char *); 413 for (q = ksprintn(ul, *p++, NULL); (ch = *q--) != 0;) 414 putchar(ch, flags, tp); 415 416 if (!ul) 417 break; 418 419 for (tmp = 0; (n = *p++) != 0;) { 420 if (ul & (1 << (n - 1))) { 421 putchar(tmp ? ',' : '<', flags, tp); 422 for (; (n = *p) > ' '; ++p) 423 putchar(n, flags, tp); 424 tmp = 1; 425 } else 426 for (; *p > ' '; ++p) 427 continue; 428 } 429 if (tmp) 430 putchar('>', flags, tp); 431 break; 432 case 'c': 433 putchar(va_arg(ap, int), flags, tp); 434 break; 435 case ':': 436 p = va_arg(ap, char *); 437 kprintf(p, flags, tp, va_arg(ap, va_list)); 438 break; 439 case 's': 440 if ((p = va_arg(ap, char *)) == NULL) 441 p = "(null)"; 442 while ((ch = *p++) != 0) 443 putchar(ch, flags, tp); 444 break; 445 case 'd': 446 ul = lflag ? va_arg(ap, long) : va_arg(ap, int); 447 if ((long)ul < 0) { 448 putchar('-', flags, tp); 449 ul = -(long)ul; 450 } 451 base = 10; 452 goto number; 453 case 'o': 454 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 455 base = 8; 456 goto number; 457 case 'u': 458 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 459 base = 10; 460 goto number; 461 case 'p': 462 putchar('0', flags, tp); 463 putchar('x', flags, tp); 464 ul = (u_long)va_arg(ap, void *); 465 base = 16; 466 goto number; 467 case 'x': 468 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 469 base = 16; 470 number: p = ksprintn(ul, base, &tmp); 471 if (width && (width -= tmp) > 0) 472 while (width--) 473 putchar(padc, flags, tp); 474 while ((ch = *p--) != 0) 475 putchar(ch, flags, tp); 476 break; 477 default: 478 putchar('%', flags, tp); 479 if (lflag) 480 putchar('l', flags, tp); 481 /* FALLTHROUGH */ 482 case '%': 483 putchar(ch, flags, tp); 484 } 485 } 486 } 487 488 /* 489 * Print a character on console or users terminal. If destination is 490 * the console then the last MSGBUFS characters are saved in msgbuf for 491 * inspection later. 492 */ 493 static void 494 putchar(c, flags, tp) 495 register int c; 496 int flags; 497 struct tty *tp; 498 { 499 extern int msgbufmapped; 500 register struct msgbuf *mbp; 501 502 if (panicstr) 503 constty = NULL; 504 if ((flags & TOCONS) && tp == NULL && constty) { 505 tp = constty; 506 flags |= TOTTY; 507 } 508 if ((flags & TOTTY) && tp && tputchar(c, tp) < 0 && 509 (flags & TOCONS) && tp == constty) 510 constty = NULL; 511 if ((flags & TOLOG) && 512 c != '\0' && c != '\r' && c != 0177 && msgbufmapped) { 513 mbp = msgbufp; 514 if (mbp->msg_magic != MSG_MAGIC) { 515 bzero((caddr_t)mbp, sizeof(*mbp)); 516 mbp->msg_magic = MSG_MAGIC; 517 } 518 mbp->msg_bufc[mbp->msg_bufx++] = c; 519 if (mbp->msg_bufx < 0 || mbp->msg_bufx >= MSG_BSIZE) 520 mbp->msg_bufx = 0; 521 } 522 if ((flags & TOCONS) && constty == NULL && c != '\0') 523 (*v_putc)(c); 524 } 525 526 /* 527 * Scaled down version of sprintf(3). 528 */ 529 int 530 #ifdef __STDC__ 531 sprintf(char *buf, const char *cfmt, ...) 532 #else 533 sprintf(buf, cfmt, va_alist) 534 char *buf, *cfmt; 535 va_dcl 536 #endif 537 { 538 register const char *fmt = cfmt; 539 register char *p, *bp; 540 register int ch, base; 541 u_long ul; 542 int lflag, tmp, width; 543 va_list ap; 544 char padc; 545 546 va_start(ap, cfmt); 547 for (bp = buf; ; ) { 548 padc = ' '; 549 width = 0; 550 while ((ch = *(u_char *)fmt++) != '%') 551 if ((*bp++ = ch) == '\0') 552 return ((bp - buf) - 1); 553 554 lflag = 0; 555 reswitch: switch (ch = *(u_char *)fmt++) { 556 case '0': 557 padc = '0'; 558 goto reswitch; 559 case '1': case '2': case '3': case '4': 560 case '5': case '6': case '7': case '8': case '9': 561 for (width = 0;; ++fmt) { 562 width = width * 10 + ch - '0'; 563 ch = *fmt; 564 if (ch < '0' || ch > '9') 565 break; 566 } 567 goto reswitch; 568 case 'l': 569 lflag = 1; 570 goto reswitch; 571 /* case 'b': ... break; XXX */ 572 case 'c': 573 *bp++ = va_arg(ap, int); 574 break; 575 /* case 'r': ... break; XXX */ 576 case 's': 577 p = va_arg(ap, char *); 578 while ((*bp++ = *p++) != 0) 579 continue; 580 --bp; 581 break; 582 case 'd': 583 ul = lflag ? va_arg(ap, long) : va_arg(ap, int); 584 if ((long)ul < 0) { 585 *bp++ = '-'; 586 ul = -(long)ul; 587 } 588 base = 10; 589 goto number; 590 break; 591 case 'o': 592 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 593 base = 8; 594 goto number; 595 break; 596 case 'u': 597 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 598 base = 10; 599 goto number; 600 break; 601 case 'p': 602 *bp++ = '0'; 603 *bp++ = 'x'; 604 ul = (u_long)va_arg(ap, void *); 605 base = 16; 606 goto number; 607 case 'x': 608 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 609 base = 16; 610 number: p = ksprintn(ul, base, &tmp); 611 if (width && (width -= tmp) > 0) 612 while (width--) 613 *bp++ = padc; 614 while ((ch = *p--) != 0) 615 *bp++ = ch; 616 break; 617 default: 618 *bp++ = '%'; 619 if (lflag) 620 *bp++ = 'l'; 621 /* FALLTHROUGH */ 622 case '%': 623 *bp++ = ch; 624 } 625 } 626 va_end(ap); 627 } 628 629 /* 630 * Put a number (base <= 16) in a buffer in reverse order; return an 631 * optional length and a pointer to the NULL terminated (preceded?) 632 * buffer. 633 */ 634 static char * 635 ksprintn(ul, base, lenp) 636 register u_long ul; 637 register int base, *lenp; 638 { /* A long in base 8, plus NULL. */ 639 static char buf[sizeof(long) * NBBY / 3 + 2]; 640 register char *p; 641 642 p = buf; 643 do { 644 *++p = "0123456789abcdef"[ul % base]; 645 } while (ul /= base); 646 if (lenp) 647 *lenp = p - buf; 648 return (p); 649 } 650
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